DESC:

FORM-2
THE PATENTS ACT, 1970 (39 of 1970)
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
(See section 10 and rule 13)

TITLE

LUBRICANTS AND A PROCESS TO PREPARE THE SAME

APPLICANT

HINDALCO INDUSTRIES LIMITED,
of address
AHURA CENTRE, 1ST FLOOR, B-WING, MAHAKALI CAVES ROAD, ANDHERI (EAST), MUMBAl-400 093

COMPLETE SPECIFICATION
The following specification particularly describes this invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
[1] The present invention relates to lubricants for hot rolling operation of aluminum ingot and a process to prepare the same.

BACKGROUND OF THE INVENTION
[2] Aluminium rolled products are produced in two ways, one with Continuous Casting (CC) route and the other with Direct Chilling (DC) route.

[3] In CC route, the molten aluminium alloy is casted continuously into 6-8 mm thickness directly. Cast sheet from continuous caster is further rolled in cold rolling mills to get desired thickness. Aluminium sheet produced by continuous caster route has limited application due to presence of high smut level on surface of aluminium sheet. Smut level generation is due to high oxidation of aluminium during casting, lubricant applied etc, further metallographic properties limit its application.

[4] In DC route, casting of aluminium alloy ingot is done to desired width, thickness and length. Surface preparation of Rolling Ingot (RI) is done through scalping operation. This is done to remove oxide layer present on the surface of Aluminium RI.

[5] RI is then soaked in soaking pits at 500-700°C. Soaking is done to achieve recrystallization temperature of aluminum alloys. Once that is achieved, ingot is rolled in hot rolling mill to desired thickness normally 4-8 mm thickness. Hot rolled coils, thus produced, are further rolled in cold rolling mills to produce aluminum coil or sheet of various thickness ranging from 1 mm to 0.040 mm.

[6] Aluminium sheets produced from this route have application in various industrial sectors like lithography, lamp stock, bottle closure, automotive fin, bus bars, food foil, pharma-foil, blister foil, etc. For all these applications, the surface of the sheets is critical. One of the most important parameter which contributes substantially in getting good surface finish at hot mill is lubricant used for rolling. Usually, surface which is generated in hot rolling application will continue in cold rolling mill as well. It is not possible to improve a bad surface from hot rolling mill. Hence, product produced in hot rolling mill should have a very good surface finish.

[7] Purpose of using specialized hot rolling lubricant aluminium rolling is to

• Improve the quality of the product.
• Increase the productivity.
• Provide the cooling to work rolls.
• Provide cooling to aluminium sheet.
• Clean the surface from aluminum fines and aluminum oxide fines generated during trimming.
• Corrosion protection to the product.

[8] Ordinary metalworking fluids (Soluble oils) are inappropriate for hot rolling application as they cause uneven oxide coating on rolled aluminium sheet, bands on aluminium surface in rolling direction, patchy surface and many more defects. Hence, mostly, in aluminium industry specialty soluble oils are used as lubricants for aluminium rolling. Usually, the lubricant is mixed in water to concentration of 2-10% depending upon the type of alloy, amount of heat generation and type of hot rolling mill.

[9] CN102746924B relates to aluminium hot-rolling oil, comprising 51-70wt% of mineral oil, 1-15wt% of non-ionic surfactant, 1-8wt% of phosphorous extreme pressure agent, 1-5wt% of antirust agent, 1-3wt% of mixed alcohol amine, 1-3wt% of oleic acid, 2-15wt% of polyol ester, and 0.1-0.5wt% of antifoaming agent, measured as the total weight of the hot-rolling oil.

[10] US 5437802 recites a lubricant composition for hot rolling of metal comprising (1) a base oil or base grease having a combination of heat-insulating agents (A) and (B), in which the heat-insulating agent (A) is an inorganic compound, and the heat-insulating agent (B) is an inorganic powder (2) an extreme pressure additive; and (3) a solid lubricant.

[11] US3855136 recites a non-staining neat oil composition for hot rolling aluminum products suitable for dispersion in water consisting essentially of about 5 to 50% by weight of at least one fatty alcohol selected from the group consisting of monohydric, saturated primary fatty alcohols having from 8 to 20 carbon atoms, about 20 to 60% by weight polybutene having an average molecular weight greater than about 500 and a viscosity from about 2400 to about 10,000 SSU at 100°F, and about 20 to 75% by weight of an additional hydrocarbon lubricating oil having a distillation range from about 500° to 725°F at one atmosphere, which distillation range is below that of the polybutene wherein at least 90% of said hydrocarbon oil is distilled within said temperature range.

[12] EP 0 690 121 discloses a lubricant for use in a metal forming process. The lubricant comprises a mixture of mineral spirits and one or more compounds selected from the group consisting of polyisobutenes having a molecular weight of from 320 to 460 and alkylene glycols having one terminal hydroxyl group and a viscosity in the range of from 65 to 1715 Saybolt Universal Seconds (SUS) at 100 °C. We are told that the selected organic compounds evaporate leaving a small trace of residue that may be removed using water based cleaning agents.

[13] EP 0 690 121 acknowledges prior art lubricants made of mineral oil that have excellent lubricating properties. The mineral oil remains as a residual coating on the fins after the fin stamping operation and it needs to be removed before subsequent manufacturing operations.

[14] EP 0690 121 also acknowledges prior art lubricants comprising mineral spirits with small amounts of surfactants and lubricity enhancement agents. Although these lubricants evaporate without leaving a residue, their lubricating performance is very poor. These lubricants are also volatile organic compounds.

[15] CN104818091A recites an aluminum alloy cutting liquid comprises 5-10 pts. fatty acid diethanolamide, 3-5 pts. sorbitan monooleate, 5-10 pts. petroleum sulfonate as a rust inhibitor, 3-5 pts. monoethanolamine, 64-82 pts. petroleum oil, 1-3 pts. lauryl alcohol, 1-3 pts. triazine derivative fungicide and 0.1-0.5 pts. silicone defoamer.

[16] Lubricants widely used in the industry are expensive and maintenance of the lubricant is not adequate. Therefore, there is a need to develop lubricants for hot rolling operations which overcome the aforesaid disadvantages.

SUMMARY OF THE INVENTION
[17] It is therefore an object of the invention to provide a lubricant for use in a metal rolling process that overcomes the disadvantages of the prior art lubricants.

[18] An object of the invention is to provide a lubricant which provides cooling to aluminium sheet during hot rolling process along with good product quality in terms of surface finish and productivity.

[19] Another object of the present invention is to develop a lubricant composition, which has adequate lubricity, a method of preparation and application thereof in hot rolling operations.

[20] For achieving the above object, the invention provides lubricant composition comprises of:
• 60-80% of at least one base oil;
• 6-12% of at least one vegetable oil based fatty acid;
• 1-3% of at least one amine;
• 5-20% of at least one base fluid;
• 0.1-1% of at least one anionic emulsifier;
• 2-6% of at least one non-ionic emulsifier; and
• 0.5-3% of at least one stabilizer.

BRIEF DESCRIPTION OF THE INVENTION
[21] In describing and claiming the invention, the following terminology will be used in accordance with the definitions set forth below. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods and materials are described herein. As used herein, each of the following terms has the meaning associated with it in this section. Specific and preferred values listed below for individual process parameters, substituents, and ranges are for illustration only; they do not exclude other defined values or other values falling within the preferred defined ranges.

[22] As used herein, the singular forms "a," "an," and "the" include plural reference unless the context clearly dictates otherwise.

[23] The terms “preferred” and “preferably” refer to embodiments of the invention that may afford certain benefits, under certain circumstances. However, other embodiments may also be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the invention

[24] As used herein, the terms “comprising” “including,” “having,” “containing,” “involving,” and the like are to be understood to be open-ended, i.e., to mean including but not limited to.

[25] The term “lubricant” as used herein refers to substance that helps to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces.

[26] The term “hot mill rolling” as used herein refers to operation which is conducted after soaking of scalped ingots. Rolling is done at recrystallisation temperature with help of lubricant in form of oil in water emulsion. Quality of lubricant decides the quality of rolled sheet at hot mill. Quality of rolled sheet is very critical in further rolling process as surface created at hot mill cannot be corrected further in cold rolling operation.
[27] The invention relates to a lubricant composition having adequate lubricity. The lubricant finds application in hot rolling of aluminum in hot mill.

[28] Accordingly, the invention discloses a lubricant composition. The composition comprises of:
• 60-80% of at least one base oil;
• 6-12% of at least one vegetable oil based fatty acid;
• 1-3% of at least one amine;
• 5-20% of at least one lubricating ester;
• 0.1-1% of at least one anionic emulsifier;
• 2-6% of at least one non-ionic emulsifier; and
• 0.5-3% of at least one stabilizer.

[29] The aforesaid components are essential to provide a lubricant composition having superior benefits.

[30] In an embodiment, the lubricant composition additionally comprises of 2-5% of at least one lubricity additive, 0.05-0.1% of at least one defoamer and 0.05-0.1% of at least one antioxidant or combinations thereof.

[31] Additive(s) improve the lubricity and stability of the composition. Defoamer and antioxidant improves the life of the composition and prevents foaming.

[32] In a preferred embodiment, the lubricant composition of the invention comprises of:
• 60-80% (W/W) of at least one base oil;
• 6-12% (W/W) of at least one vegetable oil based fatty acid;
• 1-3% (W/W) of at least one amine;
• 5-20% (W/W) of at least one lubricating ester;
• 0.1-1% (W/W) of at least one anionic emulsifier;
• 2-6% (W/W) of at least one non-ionic emulsifier;
• 0.5-3% (W/W) of at least one stabilizer;
• 2-5% (W/W) of at least one additive;
• 0.05-0.1% (W/W) of at least one defoamer; and
• 0.05-0.1% (W/W) of at least one antioxidant.

[33] The base oil is preferably of petroleum origin having less than 10% of aromatic. content, 35-50% naphthenic content, and 40-60% paraffinic content. The base oil should be adjusted such that final formulation results in a viscosity of 40-60 cSt. A mixture of two base oils to achieve appropriate viscosity e.g. VG-20 and VG-100 to get base oil of appropriate viscosity can also be used. The concentration of base oil in actual formulation is preferred in a range of 60 -80%. The base oil provides appropriate viscosity for lubrication during hot rolling. Preferred base oil is selected from group consisting of Nynas T-22, Nynas T-110.

[34] The vegetable oil fatty acid has a preferable molecular weight of 270-300, and preferably has one carboxylic acid group. Preferred concentration in formulation is 6-12% based on the type of mill and type of alloys to roll.

[35] The amine is used as a pH adjustor and fatty acid neutralizer. It is preferred in the range of 1-3% base on its molecular weight and concentration of vegetable fatty acid. Preferred amine in the formulation is, but not limited to, triethanolamine, ethanol amine, diethanol amine, etc.

[36] The lubricating ester is a complex emulsifiable ester, having viscosity in a range of 300- 400. Preferred ester is Priolube 3953 (complex ester of vegetable oil) or sorbitol ester, Peta ester, TMP ester, etc. It is preferred in a range of 5-20% based on the type of mill and type of alloys to roll.

[37] The anionic emulsifier is preferably a neutralized sulfonate or neutralized linear chain sulphates in a concentration of 0.1-1%.

[38] The non-ionic emulsifier is preferably ethoxylated alcohol or alkoxylates, castor oil ethoxylate etc having HLB 12-13 in a concentration range of 2-6%.

[39] The stabilizer is preferably a complex high molecular weight non-ionic surfactant having HLB of 5-7 in a concentration of 0.5-3%. Preferred Surfactant is Hypermer A70 or Emulsogen 5781.

[40] The additive is preferably amine neutralized phosphoric acid esters of fatty alcohols or Additin RC3770, Additin RC 3740, Additin RC 3760. They are preferred in a range of 2-5% base on load in the mill.

[41] The defoamer is preferably a blend of 3-dimensional siloxane and water or alkyl polyacrylates defoamers, EO/PO based defoamers.

[42] The antioxidant is preferably butylated hydroxyl toluene or butylated hydroxyl anisole, tert-butylhydroquinone.

[43] The combination of the components in specific proportions provides a lubricant composition having superior benefits in terms of optimum lubricity. Metal pickup on the rolls due to insufficient lubrication is avoided. Rejection in the roll bite due to over lubrication is also avoided.

[44] An embodiment of the invention relates to an emulsion comprising the lubricant composition described in the aforesaid embodiments and water. The emulsion is obtained by mixing water and the lubricant composition.

[45] The emulsion provides sufficient lubrication and heat removal during rolling and removal of aluminum fines generated in metal deformation process (rolling) from aluminium sheet along with good product quality in terms of surface finish and productivity.

[46] The lubricant composition provides adequate lubricity when used in concentration of 2-5% with water, resists bacterial growth with sufficient lubricity.

[47] In an embodiment, the invention provides a method of preparing the lubricant composition comprising the steps of.

(a) Heating a mixture of fatty acid and amine at a temperature in the range of 50°C-70°C; heated preferably for 1-2 hours.
(b) under stirring conditions sequentially adding the base oil, lubricating ester, anionic emulsifier, non-ionic emulsifier, stabilizer, additive, defoamer and antioxidant to the heated mixture of step (a) and stirring the mixture for 0.5-1 hours.

[48] In an embodiment, the heating of step (a) is carried out for a duration in the range of 1 to 2 hours. In an embodiment, stirring of step (b) is carried out for a duration in the range 0.5 to 1 hour.

[49] In an embodiment, step (b) is carried out at an elevated temperature in the range of 50°C-70°C.

[50] During operation, the lubricant composition is poured in premix tank of hot rolling emulsion with water (water to lubricant ratio 20:80). Mixture is worked with built in homogenizer in premix tank for 1-2 Hours and then the mixture is slowly added to working emulsion tank. Emulsion from working tank is fed to hot rolling mill.

[51] Beneficial effect of the lubricant composition of the present invention in aluminium rolling process is good cooling, rust prevention of aluminium rolls and increase the service life of aluminium rolls.

WORKING EXMPLES
LUBRICANT COMPOSITIONS
[52] Different formulations of the lubricant were prepared by varying ingredients as shown in table 1.
Ingredient Raw Material
Base oil Nynas T-22, Nynas T-110
Vegetable oil fatty acid Oleic Acid
Amine Triethanolamine, Ethanol amine, Diethanol amine
Lubricating ester Priolube 3953, Priolube 3986, Hariol 310, Priolube 1938
Anionic Emulsifier Estopet
Non-ionic Emulsifier Synpronics A7 LQ
Stabilizer Hypermer A70, Emulsogen 5781, Crodasinic O
Additive Additin RC3770, Additin RC 3740, Additin RC 3760, Nalube AW6110
Defoamer Foamban-MS575
Anti-oxidant Butylated hydroxyl toluene

Table 1
[53] From the ingredients of table 1, different lubricating formulations were prepared by varying the quantity of ingredients shown in table 2.

Formulations F-1 F-2 F-3 F-4 F-5 F-6 F-7 F-8
Nynas T-22 71.14 69.41 68.78 69.40 71.49 72.33 71.24 70.81
Nynas T-110 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Oleic Acid 10.16 9.92 9.83 9.91 8.37 10.33 12.21 12.11
Triethanol amine) 1.83 1.78 1.97 1.98 1.91 2.05 3.26 3.25
Priolube 3986 10.16 8.16 8.06 0.00 0.00 0.00 0.00 0.00
Priolube 3953 0.00 0.00 0.00 7.99 8.34 8.27 8.23 8.10
Hariol 310 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Priolube 1938 2.03 4.08 0.00 0.00 0.00 0.00 0.00 0.00
Hypermer A70 2.03 4.08 2.06 2.14 3.10 4.19 2.26 1.02
Synpronics A7 LQ 2.03 1.98 8.38 7.99 6.18 2.09 2.09 4.08
Crodasinic O 0.51 0.50 0.84 0.48 0.51 0.64 0.61 0.53
Nalube AW6110 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Additin RC3760 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
BHT 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05
Foamban-MS575 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05
Table -2

Formulations F-9 F-10 F-11 F-12 F-13 F-14 F-15 F-16
Nynas T-22 0.00 46.08 40.55 40.62 40.28 40.87 35.51 40.80
Nynas T-110 70.36 25.60 30.41 30.47 30.21 30.66 35.51 30.60
Oleic Acid 12.13 12.29 12.28 12.22 12.15 12.31 12.31 12.32
Triethanol amine) 3.22 3.31 3.22 3.23 3.24 3.11 3.10 3.09
Priolube 3986 0.00 0.00 0.00 0.00 0.00 4.16 0.00 4.23
Priolube 3953 8.14 8.20 8.30 8.12 0.00 0.00 8.16 0.00
Hariol 310 0.00 0.00 0.00 0.00 8.59 4.13 0.00 4.09
Priolube 1938 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hypermer A70 1.51 2.10 1.55 1.62 1.52 1.59 2.06 1.65
Synpronics A7 LQ 4.03 2.18 3.08 3.09 3.06 3.07 2.11 3.13
Crodasinic O 0.52 0.00 0.00 0.52 0.85 0.00 0.00 0.00
Nalube AW6110 0.00 0.00 0.51 0.00 0.00 0.00 0.00 0.00
Additin RC3760 0.00 0.00 0.00 0.00 0.00 0.00 1.13 0.00
BHT 0.05 0.20 0.05 0.05 0.04 0.05 0.07 0.05
Foamban-MS575 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05
Table -2

[54] The properties of formulations F-1 to F-16 are shown in table 3

Formulations Particle Size d 0.5 pH at 25 0c Conductivity at 25 0C Viscosity at 40 0C Remarks
F-1 1.409 8.18 157 98.8 Higher Viscosity & high particle Size Chances of bite Rejection in mill during rolling
F-2 1.398 8.08 222 90.3 Higher Viscosity & high particle Size Chances of bite Rejection in mill during rolling
F-3 1.057 7.93 154 77.4 Higher Viscosity Chances of bite Rejection in mill during rolling
F-4 0.668 8.18 173 42.6 lower Viscosity & low particle size Chances of Metal sticking during rolling
F-5 1.021 8.16 381 43.9 lower Viscosity Chances of Metal sticking during rolling
F-6 1.168 8.02 318 48.0 lower Viscosity Chances of Metal sticking during rolling
F-7 1.302 8.05 221 46.1 lower Viscosity Chances of Metal sticking during rolling
F-8 1.421 8.32 264 42.3 lower Viscosity Chances of Metal sticking during rolling
F-9 0.342 8.43 276 115.4 lower Particle Size Chances of Metal sticking during rolling
F-10 1.45 8.27 282 61.2 High Particle Size, non-uniform Coating in mill
F-11 1.59 8.15 208 62.5 High Particle Size, non-uniform Coating in mill
F-12 1.502 8.14 199.9 62.6 High Particle Size, non-uniform Coating in mill
F-13 0.602 8.31 201.9 54.1 lower Particle Size Chances of Metal sticking during rolling
F-14 1.517 7.98 195 79.3 High Particle Size, non-uniform Coating in mill
F-15 1.568 8.15 267.9 65.7 High Particle Size, non-uniform Coating in mill
F-16 1.56 6.67 283.4 80.1 High Particle Size, non-uniform Coating in mill
Table -3

EXAMPLE 1
PREPARATION OF LUBRICANT COMPOSITION
[1] Based on plant trials, a first working lubricant formulation was prepared was follows.
[2] 8.78 Wt/Wt of Oleic acid and 2.03 Wt/Wt Triethanol amine was heated at a temperature in the range of 50°C-70°C for 1-2 hours. To the heated mixture, 70.25 Wt/Wt of Nynas T-22 base oil (naphthenic oil) 8.8 Wt/Wt of priolube3953, 3.75 Wt/Wt of Sympronic A70 LQ non-ionic emulsifier, 2.98Wt/Wt of Additin RC3760, 1.5 Wt/Wt of hypermer A70, 0.05 Wt/Wt Foamban-MS575 defoamer and 0.05 Wt/Wt butylated hydroxyl toluene was added in a sequential manner. Subsequently the mixture stirred for a duration of 2 hours to obtain a lubricant with consistent viscosity.

EXAMPLE -2
PREPARATION OF LUBRICANT COMPOSITION
[1] Based on plant trials, a second working lubricant formulation is prepared was follows. 9.06 Wt/Wt of Oleic acid and 3.11 Wt/Wt Triethanol amine was heated at a temperature in the range of 50°C-70°C for 1-2 hours. To the heated mixture, 63.8 Wt/Wt of Nynas T-22 base oil (naphthenic oil) 9.06 Wt/Wt of priolube3953, 2.82Wt/Wt of Estopet (Anioninc Emulsifier), 6.12 Wt/Wt of Sympronic A70 LQ (non-ionic emulsifier), 3.06 Wt/Wt of Additin RC3760, 2.8 Wt/Wt of hypermer A70, 0.05 Wt/Wt Foamban-MS575 (defoamer) and 0.05 Wt/Wt butylated hydroxyl toluene was added in a sequential manner. Subsequently the mixture stirred for a duration of 2 hours to obtain a lubricant with consistent viscosity.
[2] The properties of lubricant formulation from Example 1 and 2 are shown below.

Formulations Particle Size d 0.5 pH at 25 0c Conductivity at 25 0C Viscosity at 40 0C
Example-1 1.189 7.45 168 54.8
Example-2 1.002 7.32 138 53.3
Table -4
HOT ROLLING OPERATION

[1] The working formulations 1 & 2 was tested for hot rolling operations. The observations are provided below in table 5.

SL. No. Test Parameters Test Method Unit Typical Properties Working formulation 1 Typical Properties Working formulation 2
1 Appearance Visual Dark Brown Liquid Dark Brown Liquid
2 Colour ASTM D1500 2.5 2.5
3 Density@29.5 0 C ASTM D4052 g/ml 0.909 0.920
4 Kinematic Viscosity @40 0 C ASTM D445 cSt 50-55 50-55
5 Kinematic Viscosity @100 0 C ASTM D445 cSt 7-8 7-8
6 Viscosity Index ASTM D2270 150-160 150-160
7 Copper Strip Corrosion @100 0 C for 3 hours ASTM D130 1a 1a
8 Four Ball Weld Load ASTM D2783 Kgs 160-200 160-200
9 Acid Value PTM 102 mgKOH/g 15-20 15-20
10 % Free organic acid FTIR 3.0 - 4.0% 3.0 - 4.0%
11 % Ester FTIR 8.5 - 9.0% 8.5 - 9.0%
12 % Organic Soap FTIR 5.0 - 6.0% 5.0 - 6.0%
Table 5

[2] The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to a person skilled in the art, the invention should be construed to include everything within the scope of the disclosure.

,CLAIMS:We Claim:

1) A lubricant composition comprising;
• 60-80% (W/W) of at least one base oil;
• 6-12% (W/W) of at least one fatty acid;
• 1-3.5% (W/W) of at least one amine;
• 5-20% (W/W) of at least one base fluid;
• 0.1-3% (W/W) of at least one anionic emulsifier;
• 2-6% (W/W) of at least one non-ionic emulsifier; and
• 0.5-3% (W/W) of at least one stabilizer;

2) The lubricant as claimed in claim 1, further comprises of 2-5% (W/W) of at least one additive, 0.05-0.1% (W/W) of at least one defoamer and 0.05-0.1% (W/W) of at least one antioxidant.

2) The lubricant as claimed in claim 1, wherein said base oil comprises of less than 10% of aromatic content, 35-50% naphthenic content, and 40-60% paraffinic content.

3) The lubricant as claimed in claim 1, wherein said fatty acid is oleic acid.

4) The lubricant as claimed in claim 1, wherein said amine is selected from a group consisting of triethanolamine, ethanol amine, diethanol amine, etc.

5) The lubricant as claimed in claim 1, wherein said base fluid is selected from a group consisting of sorbitol ester, peta ester, TMP ester.

6) The lubricant as claimed in claim 1, wherein said anionic emulsifier is selected from group consisting of neutralized sulfonate, neutralized linear chain sulphates.

7) The lubricant as claimed in claim 1, wherein said non-ionic emulsifier is selected from group consisting of ethoxylated alcohol or alkoxylates, castor oil ethoxylate.

8) The lubricant as claimed in claim 1, wherein said stabilizer is a non-ionic surfactant.

9) The lubricant as claimed in claim 1, wherein said additive is amine neutralized phosphoric acid esters of fatty alcohols.

10) The lubricant as claimed in claim 1, wherein said defoamer is a blend of 3-dimensional siloxane and water, alkyl polyacrylates defoamers, EO/PO based defoamers.

11) The lubricant as claimed in claim 1, wherein said anti-oxidant is selected from a group consisting of butylated hydroxyl toluene or butylated hydroxyl anisole, tert-butylhydroquinone.

12) A method of preparing the lubricant composition comprising the steps of.
(a) heating a mixture of fatty acid and amine at a temperature in the range of 50°C-70°C; heated preferably for 1-2 hours.
(b) under stirring conditions sequentially adding at base oil, lubricating ester, anionic emulsifier, non-ionic emulsifier, stabilizer, additive, defoamer and antioxidant to the heated mixture of step (a).

13) The method as claimed in claim 13, wherein the heating of step (a) is carried out for a duration in the range of 1 to 2 hours.

14) The method as claimed in claim 13, wherein step (b) is carried out for a duration in the range 0.5 to 1 hour at temperature in the range of 50°C-70°C.

Dated this 04 June 2021
M. Kisoth
IN/PA-2259
Agent for the Applicant