Claims:We Claim:
1. A Composition comprising-
- Component-A comprising vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution, rheological modifier, additive and solvent, optionally along with silica and surfactant; and
- Component-B comprising fatty acid and solvent, optionally along with silica.

2. The composition as claimed in claim 1, wherein the composition comprises-
- Component-A comprising vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution, rheological modifier, additive and solvent; and
- Component-B comprising fatty acid and solvent.

3. The composition as claimed in claim 1, wherein the composition comprises-
- Component-A comprising vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution, rheological modifier, additive, solvent, surfactant and silica; and
- Component-B comprising fatty acid and solvent.

4. The composition as claimed in claim 1, wherein the composition comprises-
- Component-A comprising vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution, rheological modifier, additive and solvent; and
- Component-B comprising fatty acid, solvent and silica.

5. The composition as claimed in claim 1, wherein the rheological modifier is selected from a group comprising dimethyl dichlorosilane treated silica modifier, fumed silica treated with hexamethyldisilazane and amino-silane.

6. The composition as claimed in claim 1, wherein the additive is selected from a group comprising nanotized titania, nanotized zinc oxide and a combination thereof.

7. The composition as claimed in claim 1, wherein the solvent is selected from a group comprising methyl ethyl ketone, ortho-xylene, methyl iso butyl ketone, and any combination thereof.

8. The composition as claimed in claim 1, wherein the surfactant is selected from a group comprising decusate sodium, dioctyl calcium sulfosuccinate, and a combination thereof.

9. The composition as claimed in claim 1, wherein the silica of the Component-A is selected from a group comprising micronized crystalline silica, processed rice husk ash, and a combination thereof.

10. The composition as claimed in claim 1, wherein the silica of the Component-B is amorphous nano silica.

11. The composition as claimed in claim 1, wherein the fatty acid is selected from a group comprising, stearic acid, calcium salt of stearic acid, barium salt of stearic acid, and any combination thereof.

12. The composition as claimed in claim 1, wherein the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution is in an amount ranging from about 11 wt% to 33 wt%; the rheological modifier is in an amount ranging from about 0.3 wt% to 0.5 wt%.

13. The composition as claimed in claim 7, wherein the methyl ethyl ketone in the Component-A is in an amount ranging from about 5 wt% to 20%; the ortho-xylene in the Component-A is in an amount ranging from about 15 wt% to 35 wt%; and wherein the methyl ethyl ketone in the Component-B is in an amount ranging from about 5 wt% to 15 wt%; the ortho-xylene in the Component-B is in an amount ranging from about 10 wt% to 30 wt%.

14. The composition as claimed in claim 6, wherein the nanotized titania is in an amount ranging from about 1 wt% to 5 wt%; the nanotized zinc oxide is in an amount ranging from about 0.5 wt% to 3 wt%.

15. The composition as claimed in claim 1, wherein the surfactant is in an amount ranging from about 0 wt % to 2 wt%; and the silica of the Component-A is in an amount ranging from about 0 wt% to 10 wt%.

16. The composition as claimed in claim 1, wherein the silica of the component-B is in an amount ranging from about 0 wt% to 5 wt%.

17. The composition as claimed in claim 1, wherein the composition has viscosity ranging from about 20 M.Pas to 50 M.Pas; non-volatile content ranging from about 19% to 40% and specific gravity ranging from about 0.7 to 1.1.

18. A method of preparing the composition as claimed in claim 1, said method comprising steps of:
preparing the Component-A;
preparing the Component-B; and
mixing the Component-A and the Component-B to obtain the composition.

19. The method as claimed in claim 18, wherein the mixing of the Component-A and the Component-B is carried out in an amount/ratio ranging from about 1:1 to 1.8:1 depending on amount of the amorphous nano-silica.

20. The method as claimed in claim 18, wherein the preparing the Component-A comprises steps of:
mixing the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution and the solvent to obtain a solution, followed by heating;
adding the rheological modifier to the solution, followed by mixing;
optionally adding the surfactant and the silica to the solution; and
adding the additive to the solution, followed by mixing to obtain the Component-A.

21. The method as claimed in claim 20, wherein the heating is carried out at a temperature ranging from about 50 ºC to 60 ºC for a duration ranging from about 10 minutes to 15 minutes.

22. The method as claimed in claim 18, wherein the preparing the Component-B comprises steps of:
mixing the solvent and the fatty acid to obtain a solution, followed by heating;
optionally purging nitrogen from the solution; or
optionally adding the silica to the solution to obtain the Component-B.

23. The method as claimed in claim 22, wherein the heating is carried out at a temperature ranging from about 50 ºC to 60 ºC, for a duration ranging from about 30 minutes to 40 minutes.

24. An article comprising the composition as claimed in claim 1.

25. The article as claimed in claim 24, wherein the composition is in a form of film on surface of the article, wherein thickness of the film is ranging from about 19 µm to 31 µm.

26. The article as claimed in claim 25, wherein the film has highest level of adhesion with the article, having ASTM D3359 class ranging from about 4B to 5B according to American standard test method ASTM D3359.

27. The article as claimed in claim 24, wherein the article has corrosion rate ranging from about 0.003 mpy to 0.477 mpy.

28. The article as claimed in claim 24, wherein the article is not wettable and has a contact angle (wetting angle) with liquid ranging from about 107º to 140º.

29. A method of producing the article as claimed in claim 24, said method comprising coating a substrate with the composition as claimed in claim 1, followed by curing to obtain the article.

30. The method as claimed in claim 29, wherein the coating is carried out by technique selected from a group comprising spray coating, dip coating, and a combination thereof.

31. The method as claimed in claim 29, wherein the curing is carried out at a temperature ranging from about 80 ºC to 100 ºC for a duration ranging from about 5 minutes to 10 minutes.
32. A method of coating a substrate with the composition as claimed in claim 1, wherein the coating is carried out by a technique selected from a group comprising dip coating, spray coating, and a combination thereof.

33. The method as claimed in claim 32, wherein the method comprises curing coated substrate at a temperature ranging from about 80 ºC to 100 ºC for a duration ranging from about 5 minutes to 10 minutes.

34. The method as claimed in claim 32, wherein the substrate coated with the composition has corrosion rate ranging from about 0.003 mpy to 0.477mpy; and wherein the substrate coated with the composition is not wettable and has a contact angle (wetting angle) with liquid ranging from about 107º to 140º.

35. The method as claimed in claim 29 or 32, wherein the substrate is selected from a group comprising zero spangled galvanized iron, galvanized iron, non-pickled hot rolled carbon steel and metallic nails.

36. Use of the composition as claimed in claim 1 for coating a substrate.

37. The use as claimed in claim 36, wherein the substrate is selected from a group comprising zero spangled galvanized iron, galvanized iron, non-pickled hot rolled carbon steel and metallic nails.

38. The use as claimed in claim 36, wherein the substrate coated with the composition has corrosion rate ranging from about 0.003 mpy to 0.477mpy and wherein the substrate coated with the composition is not wettable and has a contact angle (wetting angle) with liquid ranging from about 107º to 140º.
Dated this 22nd day of December 2020
DURGESH MUKHARYA
Of K&S Partners
Agent for the Applicants
IN/PA-1541
To:
The Controller of Patents
The Patent Office
At: Kolkata.
, Description:FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
[see section 10 and rule13]

“A COMPOSITION, AN ARTICLE, METHODS OF PREPARATION AND APPLICATION THEREOF”

Name and address of the applicants:
TATA STEEL LIMITED
Jamshedpur, 831001, Jharkhand, India
Nationality: Indian

The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
The present disclosure relates to a composition. The disclosure particularly relates to super hydrophobic coating composition, wherein the coating composition produces self-cleaning, corrosion resistant surfaces on substrates including but not limited to metallic substrates. The disclosure further relates to method of preparing the composition, an article comprising the composition, a method of producing the article, a method of coating a substrate with the composition and use of the coating composition.

BACKGROUND OF THE DISCLOSURE
Corrosion is the degradation of useful properties of a metal by chemical or electrochemical reaction with an environment, in which an anodic and cathodic reaction takes place at equal rate but at different site. To avoid the corrosion phenomenon, coatings are being used to protect the materials with some functional values to the surface such as acidic resistance, scratch resistance, super-hydrophobicity, self-cleaning and highly abrasion resistance, etc.

Superhydrophobic surfaces are those on which the dirt particles are removed from the surface when the liquid droplets are rolling off, that is, it removes dirt particles along with it. Super-hydrophilic surfaces are those in which dirt particles are removed when the water wets the surface and form a super-hydrophilic layer on it and the dirt particles are removed along with this layer. So, superhydrophobic and super-hydrophilic surfaces exhibit self-cleaning properties such as hairy leg of water strider and microscale bumps with nanoscale hairs of lotus leaf.

Although various compositions for protecting the surfaces of metallic substrate are available in the prior art, there is a constant need for developing improved composition for protecting the surface of metallic substrates, which provides improved resistance to corrosion, effectively removes dirt and maintains water repellence for longer duration of time.

STATEMENT OF THE DISCLOSURE
The present disclosure provides a composition which is super hydrophobic on surface including but not limited to metallic surfaces. The said composition is a self-cleaning coating composition which provides for improved resistance to corrosion and dust.

The present disclosure relates to a composition comprising- Component-A comprising vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution, rheological modifier, additive and solvent optionally along with silica and surfactant; and Component-B comprising fatty acid and solvent optionally along with silica.

The present disclosure also relates to a method of preparing the said composition, comprising steps of- preparing the Component-A, preparing the Component-B and mixing the Component-A and the Component-B at a predetermined ratio to obtain the composition.

The present disclosure further relates to an article comprising the composition; and a method of producing the article, comprising- coating a substrate with the composition followed by curing to obtain the article.

The present disclosure further relates to coating a substrate with the composition by techniques including but not limited to dip coating, spray coating and a combination of dip coating and spray coating.

The present disclosure further relates to use of the composition for coating a substrate.

BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
In order that the present disclosure may be readily understood and put into practical effect, reference will now be made to exemplary embodiments as illustrated with reference to the accompanying figure. The figure together with detailed description below, are incorporated in and form part of the specification, and serve to further illustrate the embodiments and explain various principles and advantages, where:

FIGURE 1 illustrates the contact angle of coated samples, wherein; A- illustrates contact angle of coated sample with a composition having no silica; B- illustrates contact angle of coated sample with a composition, wherein Component-A comprises 5 wt% micronized crystalline silica; C- illustrates contact angle of coated sample with a composition, wherein Component-A comprises 10 wt% micronized crystalline silica; D- illustrates contact angle of coated sample with a composition, wherein Component-B comprises 2 wt% amorphous nano-silica; and E- illustrates contact angle of coated sample with a composition, wherein Component-B comprises 5 wt% amorphous nano-silica.

DETAILED DESCRIPTION OF THE DISCLOSURE
Definitions:
Unless otherwise defined, all terms used in the disclosure, including technical and scientific terms, have meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. By means of further guidance, term definitions are included for better understanding of the present disclosure.

As used herein, the singular forms ‘a’, ‘an’ and ‘the’ include both singular and plural referents unless the contest clearly dictates otherwise.

The term ‘comprising’, ‘comprises’ or ‘comprised of’ as used herein are synonymous with ‘including’, ‘includes’, ‘containing’ or ‘contains’ and are inclusive or open-ended and do not exclude additional, non-recited members, elements or method steps.

The recitation of numerical ranges by endpoints includes all numbers and fractions subsumed within the respective ranges, as well as the recited endpoints.

The term ‘about’ as used herein when referring to a measurable value such as a parameter, an amount, a temporal duration, and the like, is meant to encompass variations of ±10% or less, preferably ±5% or less, more preferably ±1% or less and still more preferably ±0.1% or less of and from the specified value, insofar such variations are appropriate to perform the present disclosure. It is to be understood that the value to which the modifier ‘about’ refers is itself also specifically, and preferably disclosed.

The term ‘contact angle’ as used herein refers to an angle produced by the surface and a tangent along the surface of the liquid drop in the region of the contact point of the liquid drop with the surface. A contact angle of 0 defines complete wettability and does not form a drop. A contact angle > 900 defines non-wettability with hydrophobicity and formation of drop accordingly.

The term ‘ASTM D3359’ as used herein refers to a test method for measuring adhesion by tape test. The test assesses the adhesion of film coatings on metallic substrates by applying and removing pressure-sensitive tape over cuts made in the film. ASTM D3359 comprises two distinct test methods- Method-A and Method-B.
In Method-A- an ‘X’ is cut through the film and a prescribed pressure-sensitive tape is applied over the cut and then removed. The adhesion is evaluated on a 0 to 5 scale (0A to 5A scale).
In Method-B- a perpendicular lattice pattern with either six or eleven cuts in each direction is made through the film and a prescribed pressure-sensitive tape is applied over the lattice and then removed. The adhesion is then evaluated by comparison with descriptions and illustrates. The adhesion is evaluated on a 0 to 5 scale (0B to 5B scale), wherein- 0B means flaking and detachment worse than classification; 1B means the coating has flaked along the edges of cuts in large ribbons and whole squares have detached. The area affected is 35 to 65% lattice; 2B means the coating has flaked along the edges and on parts of the squares. The area affected is 15 to 35% of the lattice; 3B means small flakes of the coating are detached along edges and at intersections of cuts. The area affected is 5 to 15%; 4B means small flakes of the coating are detached at intersections, less than 5% of the area is affected; and 5B means the edges of the cuts are completely smooth and none of the squares of the lattice is detached.

Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the present disclosure. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification may not necessarily all refer to the same embodiment. It is appreciated that certain features of the disclosure, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the disclosure, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub-combination.

The present disclosure relates to a composition.

In an embodiment of the present disclosure, the said composition is a super hydrophobic coating composition.

In an embodiment of the present disclosure, the said composition is a self-cleaning coating composition. The composition inhibits corrosion by restricting the diffusion of water molecules to the surface of a substrate having said composition.

In an embodiment of the present disclosure, the composition demonstrates improved corrosion resistance and higher contact angle (Non-wettability).

In an embodiment of the present disclosure, the composition comprises Component-A comprising vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution, rheological modifier, additive and solvent, optionally along with silica and surfactant; and Component-B comprising fatty acid and solvent, optionally along with silica.

In another embodiment of the present disclosure, the composition comprises Component-A comprising vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution, rheological modifier, additive and solvent; and Component-B comprising fatty acid and solvent.

In another embodiment of the present disclosure, the composition comprises component-A comprising vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution, rheological modifier, additive, solvent, surfactant and silica; and Component-B comprising fatty acid and solvent.

In another embodiment of the present disclosure, the composition comprises comprising vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution, rheological modifier, additive and solvent; and Component-B comprising fatty acid, solvent and silica.

In an embodiment of the present disclosure, the rheological modifier is selected from a group comprising dimethyl dichlorosilane treated silica modifier, fumed silica treated with hexamethyldisilazane and amino silane.

In an embodiment of the present disclosure, the additive is selected from a group comprising nanotized titania, nanotized zinc oxide and a combination thereof.

In an embodiment of the present disclosure, the solvent is selected from a group comprising methyl ethyl ketone, ortho-xylene, methyl iso butyl ketone and any combination thereof.

In an embodiment of the present disclosure, the surfactant is selected from a group comprising decusate sodium, dioctyl calcium sulfosuccinate, and a combination thereof.

In an embodiment of the present disclosure, the silica of the Component-A of the composition is selected from a group comprising micronized crystalline silica, processed rice husk ash and a combination thereof.

In an embodiment of the present disclosure, the silica of the Component-B of the composition is amorphous nano silica.

In an embodiment of the present disclosure, the fatty acid is selected from a group comprising stearic acid, barium salt of stearic acid, calcium salt of stearic acid and any combination thereof.

In an embodiment of the present disclosure, the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution is in an amount ranging from about 11 wt% to 33 wt%.

In an embodiment of the present disclosure, the allyl chloropropyl siloxane copolymer modified silicone encapsulant solution is in an amount ranging from about 11 wt% to 33 wt%.

In another embodiment of the present disclosure, the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or the allyl chloropropyl siloxane copolymer modified silicone encapsulant solution is in an amount of about 11 wt%, about 12 wt%, about 13 wt%, about 14 wt%, about 15 wt%, about 16 wt%, about 17 wt%, about 18 wt%, about 19 wt%, about 20 wt%, about 21 wt%, about 22 wt%, about 23 wt%, about 24 wt%, about 25 wt%, about 26 wt%, about 27 wt%, about 28 wt%, about 29 wt%, about 30 wt%, about 31 wt%, about 32 wt% or about 33 wt%.

In an embodiment of the present disclosure, the rheological modifier is in an amount ranging from about 0.3 wt% to 0.5 wt%.

In another embodiment of the present disclosure, the rheological modifier is in an amount of about 0.3 wt%, about 0.4 wt% or about 0.5 wt%.

In an embodiment of the present disclosure, the solvent is in an amount ranging from about 5 wt% to 35 wt%.

In another embodiment of the present disclosure, the solvent is in an amount of about 5 wt%, about 6 wt%, about 7 wt%, about 8 wt%, about 9 wt%, about 10 wt%, about 11 wt%, about 12 wt%, about 13 wt%, about 14 wt%, about 15 wt%, about 16 wt%, about 17 wt%, about 18 wt%, about 19 wt%, about 20 wt%, about 21 wt%, about 22 wt%, about 23 wt%, about 24 wt%, about 25 wt%, about 26 wt%, about 27 wt%, about 28 wt%, about 29 wt%, about 30 wt%, about 31 wt%, about 32 wt%, about 33 wt%, about 34 wt% or about 35 wt%.

In an embodiment of the present disclosure, the methyl ethyl ketone in the Component-A of the composition is in an amount ranging from about 5 wt% to 20 wt%.

In another embodiment of the present disclosure, the methyl ethyl ketone in the Component-A of the composition is in an amount of about 5 wt%, about 6 wt%, about 7 wt%, about 8 wt%, about 9 wt%, about 10 wt%, about 11 wt%, about 12 wt%, about 13 wt%, about 14 wt%, about 15 wt%, about 16 wt%, about 17 wt%, about 18 wt%, about 19 wt% or about 20 wt%.

In an embodiment of the present disclosure, the ortho-xylene in the Component-A is in an amount ranging from about 15 wt% to 35 wt%.

In an embodiment of the present disclosure, the ortho-xylene in the Component-A is in an amount of about 15 wt%, about 16 wt%, about 17 wt%, about 18 wt%, about 19 wt%, about 20 wt%, about 21 wt%, about 22 wt%, about 23 wt%, about 24 wt%, about 25 wt%, about 26 wt%, about 27 wt%, about 28 wt%, about 29 wt%, about 30 wt%, about 31 wt%, about 32 wt%, about 33 wt%, about 34 wt% or about 35 wt%.

In an embodiment of the present disclosure, the methyl ethyl ketone in the Component-B of the composition is in an amount ranging from about 5 wt% to 15 wt%.

In another embodiment of the present disclosure, the methyl ethyl ketone in the Component-B of the composition is in an amount of about 5 wt%, about 6 wt%, about 7 wt%, about 8 wt%, about 9 wt%, about 10 wt%, about 11 wt%, about 12 wt%, about 13 wt%, about 14 wt% or about 15 wt%.

In an embodiment of the present disclosure, the ortho-xylene in the Component-B is in an amount ranging from about 10 wt% to 30 wt%.

In an embodiment of the present disclosure, the ortho-xylene in the Component-B is in an amount of about 10 wt%, about 11 wt%, about 12 wt%, about 13 wt%, about 14 wt%, about 15 wt%, about 16 wt%, about 17 wt%, about 18 wt%, about 19 wt%, about 20 wt%, about 21 wt%, about 22 wt%, about 23 wt%, about 24 wt%, about 25 wt%, about 26 wt%, about 27 wt%, about 28 wt%, about 29 wt% or about 30 wt%.

In an embodiment of the present disclosure, the additive is in an amount ranging from about 0.5 wt % to 5 wt%.

In another embodiment of the present disclosure, the additive is in an amount of about 0.5 wt%, about 1.0 wt%, about 1.5 wt%, about 2.0 wt%, about 2.5 wt%, about 3.0 wt%, about 3.5 wt%, about 4.0 wt%, about 4.5 wt% or about 5.0 wt%.

In an embodiment of the present disclosure, the nanotized titania is in an amount ranging from about 1 wt% to 5 wt%.

In another embodiment of the present disclosure, the nanotized titania is in an amount of about 1 wt%, about 2 wt%, about 3 wt%, about 4 wt% or about 5 wt%.

In an embodiment of the present disclosure, the nanotized zinc oxide is in an amount ranging from about 0.5 wt% to 3 wt%.

In another embodiment of the present disclosure, the nanotized zinc oxide is in an amount of about 0.5 wt%, about 1.0 wt%, about 1.5 wt%, about 2.0 wt%, about 2.5 wt%, about 3.0 wt%.

In an embodiment of the present disclosure, the surfactant is in an amount ranging from about 0 wt% to 2 wt%.

In another embodiment of the present disclosure, the surfactant is in an amount of about 0 wt%, about 0.5 wt%, about 1.0 wt%, about 1.5 wt% or about 2.0 wt%.

In an embodiment of the present disclosure, the silica of the component-A is in an amount ranging from about 0 wt% to 10 wt%.

In another embodiment of the present disclosure, the silica of the component-A is in an amount of about 0 wt%, about 1 wt%, about 2 wt%, about 3 wt%, about 4 wt%, about 5 wt%, about 6 wt%, about 7 wt%, about 8 wt%, about 9 wt% or about 10 wt%.
In an embodiment of the present disclosure, the silica of the component-B is in an amount ranging from about 0 wt% to 5 wt%.

In another embodiment of the present disclosure, the silica of the component-B is in an amount of about 0 wt%, about 1 wt%, about 2 wt%, about 3 wt%, about 4 wt% or about 5 wt%.
In an embodiment of the present disclosure, the silica of the component-A increases hydrophobicity of the composition.

In an embodiment of the present disclosure, the composition has viscosity ranging from about 20 mPas to 50 mPas.

In another embodiment of the present disclosure, the composition has viscosity of about 20 mPas, about 22 mPas, about 24 mPas, about 26 mPas, about 28 mPas, about 30 mPas, about 32 mPas, about 34 mPas, about 36 mPas, about 38 mPas, about 40 mPas, about 42 mPas, about 44 mPas, about 46 mPas, about 48 mPas or about 50 mPas.

In an embodiment of the present disclosure, the composition has non-volatile content ranging from about 19% to 40%.

In another embodiment of the present disclosure, the composition has non-volatile content of about 19%, about 20%, about 21%, about 22%, about 23%, about 24%, about 25%, about 26%, about 27%, about 28%, about 29%, about 30%, about 31%, about 32%, about 33%, about 34%, about 35%, about 36%, about 37%, about 38%, about 39% or about 40%.

In an embodiment of the present disclosure, the composition has specific gravity ranging from about 0.7 to 1.1.

In another embodiment of the present disclosure, the composition has specific gravity of about 0.7, about 0.8, about 0.9, about 1.0 or about 1.1.

The present disclosure further relates to a method of preparing the composition described above.

In an embodiment of the present disclosure, the method of preparing the composition comprises-
- Preparing the Component-A;
- Preparing the Component-B; and
- Mixing the Component-A and Component-B to obtain the composition.

In an embodiment of the present disclosure, the mixing of the Component-A and Component-B is carried out in a ratio ranging from about 1:1 to 1.8:1, depending on the amount of the amorphous nano-silica.

In another embodiment of the present disclosure, the mixing of the Component-A and Component-B is carried out in a ratio of about 1:1 to 1.1:1, about 1:1 to 1.2:1, about 1:1 to 1.3:1, about 1:1 to 1.4:1, about 1:1 to 1.5:1, about 1:1 to 1.6:1, about 1:1 to 1.7:1 or about 1:1 to 1.8:1, depending on the amount of the amorphous nano-silica.

In an embodiment of the present disclosure, preparing the Component-A comprises steps of-
mixing the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution and the solvent to obtain a solution, followed by heating;
adding the rheological modifier to the solution, followed by mixing;
optionally adding the surfactant and the silica to the solution; and
adding the additive to the solution, followed by mixing to obtain the Component-A.

In another embodiment of the present disclosure, preparing the Component-A comprises steps of-
mixing the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution and the solvent to obtain a solution, followed by heating;
adding the rheological modifier to the solution, followed by mixing; and
adding the additive to the solution, followed by mixing to obtain the Component-A.

In another embodiment of the present disclosure, preparing the Component-A comprises steps of-
mixing the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution and the solvent to obtain a solution, followed by heating;
adding the rheological modifier to the solution, followed by mixing;
adding the surfactant and the silica to the solution; and
adding the additive to the solution, followed by mixing to obtain the Component-A.

In an embodiment of the present disclosure, the heating is carried out at a temperature ranging from about 50 ºC to 60 ºC for a duration ranging from about 10 minutes to 15 minutes.

In another embodiment of the present disclosure, the heating is carried out at a temperature of about 50 ºC, about 51 ºC, about 52 ºC, about 53 ºC, about 54 ºC, about 55 ºC, about 56 ºC, about 57 ºC, about 58 ºC, about 59 ºC or about 60 ºC for a duration of about 10 minutes, about 11 minutes, about 12 minutes, about 13 minutes, about 14 minutes or about 15 minutes.

In an embodiment of the present disclosure, the mixing is carried out for a duration ranging from about 10 minutes to 30 minutes.

In another embodiment of the present disclosure, the mixing is carried out for a duration of about 10 minutes, about 12 minutes, about 14 minutes, about 16 minutes, about 18 minutes, about 20 minutes, about 22 minutes, about 24 minutes, about 26 minutes, about 28 minutes or about 30 minutes.

In an embodiment of the present disclosure, the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution is prepared by mixing silicone encapsulant solution with vinly/allyl (chloropropyl) siloxane copolymer in a ratio of about 10:1 in presence of lewis acid such as BCl3 and AlCl3 by which the chloro group converts into hydroxyl group which further reacts with silicone encapsulant solution through oxygen bond (H exists from -OH group).

In an embodiment of the present disclosure, the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution is not allowed to swell prior to use for preparing the Component-A. Because swelling of the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or allyl chloropropyl siloxane copolymer modified silicone encapsulant solution would diminish the property of the vinyl chloropropyl siloxane copolymer modified silicone encapsulant solution or the allyl chloropropyl siloxane copolymer modified silicone encapsulant solution

In an embodiment of the present disclosure, adding the surfactant and silica involves mixing pulverized rice husk ash and decusate sodium surfactant and treating the mixture in a furnace under nitrogen atmosphere for about 5 hours at a temperature of about 500 ºC, followed by mixing for about 15 minutes. The treated rich husk ash (micronized crystalline silica) in the mixture has finer particle size of about 5 µm when compared to non-treated rice husk ash.

In an embodiment of the present disclosure, preparing the Component-B comprises-
Mixing the solvent and the fatty acid to obtain a solution, followed by heating;
Optionally purging nitrogen from the solution; or
Optionally adding the silica to the solution to obtain the Component-B.

In another embodiment of the present disclosure, preparing the Component-B comprises-
Mixing the solvent and the fatty acid to obtain a solution, followed by heating; and
Purging nitrogen from the solution to obtain Component-B.

In another embodiment of the present disclosure, preparing the Component-B comprises-
Mixing the solvent and the fatty acid to obtain a solution, followed by heating; and
Adding the silica to the solution to obtain the Component-B.

In another embodiment of the present disclosure, preparing the Component-B comprises mixing the solvent and fatty acid to obtain a solution, followed by heating the solution under mixing to a temperature ranging from about 50 ºC to 60 ºC for a duration ranging from about 10 minutes to 15 minutes. The said specific heating is carried out to dissolve the fatty acid in the solvent. The formed solution is stable at room temperature for at least 12 hours. In order to prevent precipitation of the solution, nitrogen purging is carried out. However, if silica including but not limited to amorphous nano-silica is added to the solution, then nitrogen purging is not carried out.

In another embodiment of the present disclosure, the solution of the fatty acid and the solvent is heated under mixing to a temperature of about 50 ºC, about 51 ºC, about 52 ºC, about 53 ºC, about 54 ºC, about 55 ºC, about 56 ºC, about 57 ºC, about 58 ºC, about 59 ºC or about 60 ºC for a duration of about 10 minutes, about 11 minutes, about 12 minutes, about 13 minutes, about 14 minutes or about 15 minutes.

In an embodiment of the present disclosure, the amorphous nano-silica is prepared in the following manner-
Mixing demineralized water and vinyltrimethoxy silane;
Adding aminopropyl triethyoxy silane, followed by heating;
Adding glycidyl oxyproply trimethoxy silane and methyl trimethoxy, followed by mixing to obtain a precipitate; and
Rinsing the precipitate with demineralized water, followed by drying to obtain the amorphous nano-silica.

In another embodiment of the present disclosure, the amorphous nano-silica is prepared by-
mixing about 5 wt% to 10 wt% of vinyltrimethoxy silane and 70 wt% to 80 wt% of demineralized water, followed by mixing for a duration of about 15 minutes;
adding about 3 wt% to 5 wt% of aminopropyl triethoxy silane, followed by heating to a temperature of about 50 ºC for a duration of about 5 minutes;
adding about 5 wt% to 10 wt% glycidyl oxypropyl trimethoxy silane and about 5 wt% to 10 wt% of methyl trimethoxy silane, followed by mixing for a durarion of about 1 hour to obtain a precipitate; and
rinsing the precipitate with demineralized water, followed by drying in an oven at a temperature of about 40 ºC for a duration of about 10 minutes to obtain the amorphous nano-silica.

In an embodiment of the present disclosure, the amorphous nano-silica has particle size ranging from about 40 nm to 60 nm.

In another embodiment of the present disclosure, the amorphous nano-silica has particle size of about 40 nm, about 41 nm, about 42 nm, about 43 nm, about 44 nm, about 45 nm, about 46 nm, about 47 nm, about 48 nm, about 49 nm, about 50 nm, about 51 nm, about 52 nm, about 53 nm, about 54 nm, about 55 nm, about 56 nm, about 57 nm, about 58 nm, about 59 nm or about 60 nm.

In an embodiment of the present disclosure, upon adding the amorphous nano-silica to the solution of fatty acid and solvent, the solution is subjected to mixing by technique including but not limited to ultrasonication for a duration ranging from about 15 to 30 minutes.

In an embodiment of the present disclosure, the amorphous nano-silica- increases the adhesion property of the above-described composition to the substrate; increases hydrophobicity of the said composition due to reduced particle size of the amorphous nano-silica, which fills the pores when the composition is applied as a film on substrate.

The present disclosure further relates to an article.

In an embodiment of the present disclosure, the article comprises the composition described above.

In an embodiment of the present disclosure, the composition is present on the surface of the article.

In an embodiment of the present disclosure, the composition is present on the surface of the article in a form including but not limited to coating and film.

In an embodiment of the present disclosure, thickness of the film or the coating on the surface of the article is ranging from about 19 µm to 31 µm.

In another embodiment of the present disclosure, thickness of the film or the coating on the surface of the article is about 19 µm, about 20 µm, about 21 µm, about 22 µm, about 23 µm, about 24 µm, about 25 µm, about 26 µm, about 27 µm, about 28 µm, about 29 µm, about 30 µm or about 31 µm.

In an embodiment of the present disclosure, the film or the coating has highest level of adhesion on the surface of the article, having ASTM D3359 class ranging from about 4B to 5B according to American standard test method ASTM D3359.

In an embodiment of the present disclosure, the article comprising the said composition is resistant to corrosion having corrosion rate ranging from about 0.003 mpy to 0.477 mpy.

In an embodiment of the present disclosure, the article comprising the said composition is unwettable or non-wettable and has a contact angle (wetting angle) with liquid ranging from about 107º to 140º.

In another embodiment of the present disclosure, the article comprising the said composition has contact angle with liquid of about 107 º, about 108 º, about 109 º, about 110 º, about 112 º, about 114 º, about 116 º, about 118 º, about 120 º, about 122 º, about 124 º, about 126 º, about 128 º, about 130 º, about 132 º, about 134 º, about 136 º, about 138 º or about 140 º.

The present disclosure further relates to a method of preparing the said article.

In an embodiment of the present disclosure, the method of preparing the said article comprises- coating a substrate with the composition described above, followed by curing to obtain the article.

In an embodiment of the present disclosure, the coating is carried out by technique including but not limited to spray coating, dip coating and combination of spray coating and dip coating.

In an embodiment of the present disclosure, the curing is carried out at a temperature ranging from about 80 ºC to 100 ºC for a duration ranging from about 5 minutes to 10 minutes.

In another embodiment of the present disclosure, the curing is carried out at a temperature of about 80 ºC, about 82 ºC, about 84 ºC, about 86 ºC, about 88 ºC, about 90 ºC, about 92 ºC, about 94 ºC, about 96 ºC, about 98 ºC or about 100 ºC for a duration ranging from about 5 minutes, about 6 minutes, about 7 minutes, about 8 minutes, about 9 minutes or about 10 minutes.

In an embodiment of the present disclosure, the substrate includes but it is not limited to zero spangled galvanized iron, galvanized iron, non-pickled hot rolled carbon steel and metallic nails.

The present disclosure further relates to a method of coating a substrate with the composition described above.

In an embodiment of the present disclosure, the method of coating the substrate with the composition comprises coating the composition by a technique including but not limited to dip coating, spray coating and a combination of dip coating and spray coating.

In an embodiment of the present disclosure, upon coating the substrate with the composition, the substrate is subjected to curing at a temperature ranging from about 80 ºC to 100 ºC for a duration ranging from about 5 minutes to 10 minutes.

In another embodiment of the present disclosure, the coated substrate is subjected to curing at a temperature of about 80 ºC, about 82 ºC, about 84 ºC, about 86 ºC, about 88 ºC, about 90 ºC, about 92 ºC, about 94 ºC, about 96 ºC, about 98 ºC or about 100 ºC for a duration of about 5 minutes, about 6 minutes, about 7 minutes, about 8 minutes, about 9 minutes or about 10 minutes.

In an embodiment of the present disclosure, the substrate coated with the composition is resistant to corrosion having reduced corrosion rate ranging from about 0.003 mpy to 0.477 mpy.

In an embodiment of the present disclosure, the substrate coated with the said composition is unwettable or non-wettable and has a contact angle (wetting angle) with liquid ranging from about 107º to 140º.

In another embodiment of the present disclosure, the substrate coated with the said composition has contact angle with liquid of about 107 º, about 108 º, about 109 º, about 110 º, about 112 º, about 114 º, about 116 º, about 118 º, about 120 º, about 122 º, about 124 º, about 126 º, about 128 º, about 130 º, about 132 º, about 134 º, about 136 º, about 138 º or about 140 º.

In an embodiment of the present disclosure, the substrate includes but it is not limited to zero spangled galvanized iron, galvanized iron, non-pickled hot rolled carbon steel and metallic nails.

The present disclosure further relates to use of the above-described composition for coating a substrate.

In an embodiment of the present disclosure, the use of said composition imparts corrosion resistance to the substrate including but not limited to zero spangled galvanized iron, galvanized iron, non-pickled hot rolled carbon steel and metallic nails. The said coated substrate has reduced corrosion rate ranging from about 0.003 mpy to 0.477 mpy.

In an embodiment of the present disclosure, the use of said composition imparts unwettable property to the substrate, wherein the contact angle of the coated substrate with the liquid is ranging from about 107º to 140º.

In another embodiment of the present disclosure, the use of the said composition imparts unwettable property to the substrate, wherein the contact angle of the coated substrate with the liquid is about 107 º, about 108 º, about 109 º, about 110 º, about 112 º, about 114 º, about 116 º, about 118 º, about 120 º, about 122 º, about 124 º, about 126 º, about 128 º, about 130 º, about 132 º, about 134 º, about 136 º, about 138 º or about 140 º.

It is to be understood that the foregoing descriptive matter is illustrative of the disclosure and not a limitation. While considerable emphasis has been placed herein on the particular features of this disclosure, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. Those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein. Similarly, additional embodiments and features of the present disclosure will be apparent to one of ordinary skill in art based upon description provided herein.
Descriptions of well-known/conventional methods/steps and techniques are omitted so as to not unnecessarily obscure the embodiments herein. Further, the disclosure herein provides for examples illustrating the above-described embodiments, and in order to illustrate the embodiments of the present disclosure, certain aspects have been employed. The examples used herein for such illustration are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, following examples should not be construed as limiting the scope of the embodiments herein.

EXAMPLES

Example 1: Preparing the Composition.
i. Preparing Component-A

The silicone encapsulant solution was mixed with vinyl/allyl (chloropropyl)siloxane copolymer in a ratio of about 10:1 in presence of any lewis acid (BCl3/AlCl3), wherein the chloro group converts into hydroxyl group which further reacts with silicone encapsulant solution through oxygen bond (H exits from -OH group). The obtained vinyl/allyl (chloropropyl) siloxane copolymer modified silicone encapsulant solution was not allowed to swell because swelling diminishes the property of the vinyl/allyl (chloropropyl) siloxane copolymer modified silicone encapsulant solution.

About 11 wt% of 33 wt.% of vinyl/allyl (chloropropyl) siloxane copolymer modified silicone encapsulant solution was mixed with about 5 wt.% to 20 wt. % of methyl ethyl ketone and about 15 wt% to 35 wt % of xylene in a vessel to obtain a solution. The solution was stirred for about 10 minutes. The said solution was heated for about 10 minutes at a temperature of about 50 ºC and then heating was stopped. About 0.3 wt. % of dimethyldichlorosilane treated silica modifier was added and mixed. The whole solution was stirred up to about 30 minutes followed by adding about 10 wt% of micronized crystalline silica and mixed well to increase the hydrophobicity.

Thereafter, about 1 wt% to 5 wt. % of nano-titania and about 0.5 wt% to 3 wt.% of nano-zinc oxide was added and mixed to obtain the Component-A
The micronized crystalline silica was prepared in the following manner-
Pulverized rice husk ash having particle size of about 45µm was mixed with about 1 wt. % of decusate sodium surfactant and treated in a furnace under nitrogen atmosphere for about 5 hours at a temperature of about 500 ºC, followed by mixing for a duration of about 15 minutes. The treated rice husk ash (micronized crystalline silica) was having finer particles of about 5µm than nontreated rice husk ash.
(Note- In case micronized crystalline silica is not added to the solution, then the surfactant is also not added.)

ii. Preparing Component-B

About 5wt % to 15 wt. % of methyl ethyl ketones and about 10 wt% to 30 wt.% of ortho-xylene was mixed in a vessel, followed by stirring. While stirring, about 3 wt% to 5 wt. % of stearic acid was added. Stearic Acid is a saturated long-chain fatty acid with an 18-carbon backbone. Stearic acid has one polar end and one non-polar carbon chain. The polar end participates into reaction and nonpolar end participates to provide water repellant properties. The whole solution was stirred for about 30 minutes with constant heating at a temperature of about 50 ºC. The heating was carried out to dissolve stearic acid into diluents (xylene and methyl ethyl ketone). The formed solution was stable at room temperature until about 12 hours. After that, lamellar shaped precipitation occurs. So, to avoid precipitation, nitrogen purging during packaging was needed. Before packaging, if amorphous nano-silica was mixed, then there was no need of nitrogen purging. Upon adding the amorphous nano-silica, the solution was ultrasonicated for a duration of about 10 minutes,

The amorphous nano-silica was prepared in the following manner-
About 70 wt% to 80 wt. % of demineralized water and about 5 wt% to 10 wt. % of vinyltrimethoxy silane was mixed in a vessel for about 15 minutes. Then, about 3 wt% to 5 wt.% of aminopropyl triethoxy silane was mixed and heated for a temperature of about 50 ºC for about 5 minutes. The heating was stopped and about 5 wt% to 10 wt. % of glycidyl oxypropyl trimethoxy silane and about 5 wt% to 10 wt. % of methyl trimethoxy silane was mixed. The whole solution was stirred for about 60 minutes to obtain a precipitate. The formed precipitate was rinsed with demineralized water and dried in oven at a temperature of about 40 ºC for about 10 minutes to get rid of moisture and it was placed in a desiccator. The formed precipitate weighed around 5 g to 7 g, having particle size ranging from about 40 nm to 60 nm.

The solution of Component-B was mixed with the Component-A in a ratio ranging from about 1:1 to 1.8:1 to obtain the composition.

Example 2: Preparing the Composition.
i. Preparing Component-A
About 27.5 wt. % of vinyl (chloropropyl) siloxane copolymer modified silicone encapsulant solution was mixed with about 11 wt. % of methyl ethyl ketone and about 18 wt % of xylene in a vessel. The solution was stirred for about 10 minutes. The solution was heated for about 10 minutes at a temperature of about 50 ºC and then heating was stopped and about 0.5 wt. % of dimethyldichlorosilane treated silica modifier was mixed. The whole solution was stirred for about 30 minutes. About 4 wt. % of nano-titania and about 3 wt.% of nano-zinc oxide was mixed to obtain the Component-A.

ii. Preparing Component-B
About 12 wt. % of methyl ethyl ketones and about 20 wt.% of ortho-xylene was mixed in a vessel and stirred. About 4 wt. % of stearic acid was added to the vessel while stirring. The whole solution was stirred for about 30 minutes with constant heating at a temperature of about 50 ºC. The said heating was required to dissolve stearic acid into diluents (xylene and methyl ethyl ketone). The formed solution was stable at room temperature till 12 hours. In order to avoid precipitation of the solution, nitrogen purging was carried out.

The solution of Component-B was mixed with the Component-A in a ratio ranging from about 1:1 to 1.8:1 to obtain the composition.

Example 3: Preparing the Composition.
iii. Preparing Component-A
About 11 wt. % of allyl (chloropropyl) siloxane copolymer modified silicone encapsulant solution was mixed with about 15 wt.% or 20 wt. % (depending on the quantity of micronized crystalline silica) of methyl ethyl ketone and about 23.2 wt % of xylene in a vessel. The solution was stirred for about 10 minutes. The solution was heated for about 10 minutes at a temperature of about 50 ºC and then heating was stopped and about 0.3 wt. % of dimethyldichlorosilane treated silica modifier was mixed. The whole solution was stirred for about 30 minutes. About 5 wt% or about 10 wt% of micronized crystalline silica (depending on the quantity of methyl ethyl ketone) containing about 1 wt% of decusate sodium surfactant was added. Further, about 4 wt. % of nano-titania and about 3 wt.% of nano-zinc oxide was mixed to obtain the Component-A.

iv. Preparing Component-B
About 15 wt. % of methyl ethyl ketones and about 19 wt.% of ortho-xylene was mixed in a vessel and stirred. About 4 wt. % of stearic acid was added to the vessel while stirring. The whole solution was stirred for about 30 minutes with constant heating at a temperature of about 50 ºC. The said heating was required to dissolve stearic acid into diluents (xylene and methyl ethyl ketone). The formed solution was stable at room temperature till 12 hours. In order to avoid precipitation of the solution, nitrogen purging was carried out.

The solution of Component-B was mixed with the Component-A in a ratio ranging from about 1:1 to 1.8:1 to obtain the composition.

Example 4: Preparing the Composition.
v. Preparing Component-A
About 11 wt. % of vinyl (chloropropyl) siloxane copolymer modified silicone encapsulant solution was mixed with about 15 wt.% of methyl ethyl ketone and about 23.7 wt % or 25.7 wt% (depending on the quantity of amorphous nano-silica) of xylene in a vessel. The solution was stirred for about 10 minutes. The solution was heated for about 10 minutes at a temperature of about 50 ºC and then heating was stopped and about 0.3 wt. % of dimethyldichlorosilane treated silica modifier was mixed. The whole solution was stirred for about 30 minutes. About 4 wt. % of nano-titania and about 3 wt.% of nano-zinc oxide was mixed to obtain the Component-A.

vi. Preparing Component-B
About 15 wt. % of methyl ethyl ketones and about 15 wt.% of ortho-xylene was mixed in a vessel and stirred. About 5 wt. % of stearic acid was added to the vessel while stirring. The whole solution was stirred for about 30 minutes with constant heating at a temperature of about 50 ºC. The heating was required to dissolve stearic acid into diluents (xylene and methyl ethyl ketone). About 3 wt% or 5 wt% (depending on the quantity of ortho-xylene of Component-A) amorphous nano silica was added and ultrasonicated for about 10 minutes to obtain Component-B.

The solution of Component-B was mixed with the Component-A in a ratio ranging from about 1:1 to 1.8:1 to obtain the composition.

Table 1 illustrates the liquid properties of the composition prepared in the Examples 2 to 4.

SL.No. Sample name Viscosity (M.Pas) % Non-volatile content Specific Gravity
1 Composition of Example 2 (Component A: without micronized crystalline silica; Component-B: without amorphous nano-silica) 27.3 39 0.95
2 Composition of Example 3 (Component A: with 5 wt% micronized crystalline silica; Component-B: without amorphous nano-silica) 30 22.8 0.95
3 Composition of Example 3 (Component A: with 10 wt% micronized crystalline silica; Component-B: without amorphous nano-silica) 31.5 27.8 0.97
4 Composition of Example 4 (Component A: without micronized crystalline silica; Component-B: with 3 wt% amorphous nano-silica) 33.8 19.3 0.98
5 Composition of Example 4 (Component A: without micronized crystalline silica; Component-B: with 5 wt% amorphous nano-silica) 41.3 21.3 1.04
Table 1

Example 5: Preparing the article.
The composition obtained from the Examples 2, 3 and 4 were independently coated on a substrate, such as spangled galvanized iron by technique including but not limited to spray coating and dip coating, followed by curing the substrate at a temperature ranging from about 80º to 100 ºC for a duration ranging from about 5 minutes to 10 minutes to obtain the article having the composition in the form of film or coating on the surface of the article.

The obtained article was subjected to Salt spray hours assessment (accelerated corrosion testing and hydrophobicity testing (contact angle)) and adhesion testing (ASTM D3359). Table 2 illustrates the results of Salt spray hours assessment and adhesion testing of the film on the surface of the article. Figure 1 depicts the contact angle.
SL.No. Sample name Dry film thickness (DFT)
(µm) Adhesion Corrosion rate mpy Salt Spray test
(hours) Contact angle
1 Article comprising the composition of Example 2 19 4B 0.477 240 107
2 Article comprising the composition of Example 3 (Component A: with 5 wt% micronized crystalline silica; Component-B: without amorphous nano-silica) 22 4B 0.195 288 113
3 Article comprising the Composition of Example 3 (Component A: with 10 wt% micronized crystalline silica; Component-B: without amorphous nano-silica) 23 4B 0.042 360 117
4 Article comprising the Composition of Example 4 (Component A: without micronized crystalline silica; Component-B: with 3 wt% amorphous nano-silica) 25 5B 0.018 432 130
5 Article comprising the Composition of Example 4 (Component A: without micronized crystalline silica; Component-B: with 5 wt% amorphous nano-silica) 31 5B 0.003 504 139
Table 2:
Based on the data present in the Table 2 above, it is apparent that the described compositions of the present disclosure showed improved anticorrosion property and improved adhesion when applied to the substrate.