Claims:1. The process for the treatment of paint sludge to obtain homogenous mixture of treated paint sludge comprising the following steps:
a) Subjecting the paint sludge for grinding in ball mill for 30 min. to reduce the particle size followed by soaking in aqueous, organic solvent mixture;
b) Centrifuging the soaked paint sludge for around 10 min. at 4000 RPM followed by vacuum oven drying at 120°C for 1 hr;
c) Subjecting the oven dried paint sludge to uniform stirring about 1 hr at 500 RPM under High speed disperser; repeating the step(b), if necessary;
d) Subjecting the treated paint sludge for grinding in ball mill for 30 min. to obtain homogenous mixture of treated paint sludge; and
e) converting the treated paint sludge in reusable forms selected from primer, paint, pigment tinters.

2. The process according to claim 1, wherein the hydrophillic organic solvent is selected from the group consisting of methanol, Ethanol, Isopropyl Alcohol, Tetrahydrofuran, acetone, Acetonitrile, Ethyl acetate, N,N-Dimethylformamide, Dimethyl Sulfoxide.

3. The process according to claim 2, wherein the hydrophillic organic solvent is methanol.

4. The process according to claim 3, wherein the water and methanol is in a ratio of 9:1.

5. The process according to claim 1, wherein the source of the paint sludge is selected from the group consisting of LPG gas cylinders; automotive industry; appliance industry and metal fabrication industry.

6. A process for conversion of the paint sludge into a primer comprising the steps of:
a) Subjecting the paint sludge for grinding in ball mill for 30 min. to reduce the particle size followed by soaking in aqueous, hydrophilic organic solvent mixture;
b) Centrifuging the soaked paint sludge for around 10 min. at 4000 RPM followed by vacuum oven drying at 120°C for 1 hr;
c) Subjecting the oven dried paint sludge to uniform stirring about 1 hr at 500 RPM under High speed disperser and if necessary repeating the step (b);
d) Subjecting the treated paint sludge for grinding in ball mill for 30 min. to obtain homogenous mixture of treated paint sludge;
e) Charging the ingredients such as polymeric resin or varnish, dispersing agent, pigments, solvent as per mill base calculation to the treated paint sludge in ball mill;
f) Dispersing the above mixture in cascading mechanism in ball mill for about 5-6 hrs till the fineness of grinding value is obtained to + 4 Hegmann gauge; and
g) Subjecting the dispersed mixture to let down operation under high speed disperser with addition of remaining ingredients such as polymeric resin, solvent, thickening agent and driers as per let down calculation for 1 hr in high speed disperser to obtain the primer.

7. The process according to claim 6, wherein the hydrophillic organic solvent is selected from the group consisting of methanol, Ethanol, Isopropyl Alcohol, Tetrahydrofuran, acetone, Acetonitrile, Ethyl acetate, N,N-Dimethylformamide, Dimethyl Sulfoxide.

8. The process according to claim 7, wherein the hydrophillic organic solvent is methanol.

9. The process according to claim 8, wherein the water and methanol is in a ratio of 9:1.

10. The process according to claim 6, wherein the pigment is selected from the group consisting of red oxide pigment, zinc chrome, whiting Lead chrome, Red Lead, Talc, Barytes.

11. The process according to claim 6, wherein the solvent may be selected from mineral turpentine oil, n-Butanol, Methyl Ethyl Ketone, Isopropanol.

12. The process according to claim 6, wherein the dispersing agent used may be selected from soyalecithin or Tween-80.

13. The process according to claim 6, wherein the resin is selected from alkyd resin, Polyvinyl butyral Resin, Polyether resin, Epoxy resin.

14. The process according to claim 7, wherein the varnish is selected from Long oil linseed–tung oil modified Phenolic varnish.

15. The process according to claim 6, wherein the thickening agent is clay gallant.

16. The process according to claim 6, wherein, the driers such as Cobalt Napththenate and lead Napththenate.

17. The process according to claim 6, wherein, the source of the paint sludge is selected from the group consisting of LPG gas cylinders; automotive industry; appliance industry and metal fabrication industry. , Description:Field of Invention:

The invention provides an improved efficient process for treatment of crude paint sludge to yield enriched quality of paint sludge suitable for preparation of useful products.

Background of Invention:

In general, the paint and varnish industry is an important source of chemical waste. Painting by spraying generates waste due to over spray or the paint not reaching the target. This over sprayed paint is washed with the help of water forms sludge. Thus the mixture of water with over sprayed paint is called ‘paint sludge’. Paint sludge is produced mainly in the metal processing industry, appliance industry and automotive industry. Paint sludge is also produced with painting of wood products, manufactures, outdoor structures such as bridges and lanterns and all kinds of industrial equipments. Paint sludge typically comprises of uncured polymer resins, pigments, curing agents, heavy metals, surfactants and other minor constituents of the formulation. In addition, paint sludge typically comprises of water and / or a variety of organic solvents.

Paint sludge is an important issue both from management and ecological point of view because of its huge quantities and hazardous properties. In recent years a number of methods for treating paint sludge and create useful byproducts from the same have been developed and reported.

WO Patent No.2014/0379955 A1 (2014) discloses extraction process of reusable material from paint sludge, which is a residue in process of any painting activity using special processing equipment.

U.S.Pat. No. 8168,688 B2 (2012) teaches process of recycling paint sludge component made thereof which includes for making a solid components out of recycled paint sludge.

U.S.Pat. No. 20090221727 A1 (2009) discloses composition and process for conversion of paint sludge into reusable paint; it consumes the environmentally hazardous sludge collected from paint application systems.

U.S.Pat.No.20080216392 A1 (2008) discloses a method of producing a combustible fuel product from paint sludge which involves drying raw paint sludge from paint booth operations.

WO Pat.No.2007/072502 A3 (2007) discloses composition and process for conversion of paint sludge into reusable paint.

Prior art KR20010059068 (2001) discloses a process for preparing filler to recover and reuse waste paint sludge. The process includes an agitating step to treat the sludge to completely remove free water contained in the sludge under vacuum condition simultaneously with drying the sludge to use as fillers.

U.S.Pat. No.5, 954,970 (1999) teaches a method of treating paint sludge and processing it in the form of a dried powder which may be used as a component in asphalt, concrete and sealants.

U.S.Pat. No.5,922,834 (1999) teaches a method for treating waste paint sludge which may be used in compositions such as pressure sensitive sealants, automotive sealants and asphalt cement coatings.

U.S.Pat. No.5, 765,293(1998) teaches a process for treating paint sludge in which the paint powder / sludge mixture is agitated and heated to cure the paint sludge. Processing can occur either continuously or in batch mode and can be accomplished using a mixer charged with heated gases or a heated mixer.

U.S.Pat.No.5,562,590 (1996) discloses a process for treating waste material like paint sludge. The particulate material is heated to remove the solvent, leaving a dry powder which may be used as filler for various applications.
U.S.Pat. No.5,543,367 (1996) teaches a process for decomposing dried paint sludge at 900°C to recover solvent and the end products are used as reinforcing fillers.

U.S. Pat. No.5, 490,907 (1996) teaches a method and apparatus for the recovery of volatiles from an organic sludge including paint sludge. The method involves distillation for recovering solvents and the resultant product is a dry granular solid which is used in building industry as raw material or as fillers.

U.S.Pat. No.5, 496,404 (1996) teaches a process for treating waste paint that can be used in the manufacture of portland cement. The waste paint is added to the process after burning the raw materials.

U.S.Pat. No.5,254,263 (1993) discloses a method for making a sludge powder and sealant from paint sludge and also involves the method where paint sludge is used as functional filler in preparing sealant compositions.

U.S.Pat. No.5,223,141 (1993) discloses a method for removing and recovering solvent-based paint overspray through contact with an agitated dispersion of an organic solvent in water and then allowing the dispersion to phase separate, for separation of the organic phase from the aqueous phase. The paint solids can be recovered for further use such as filler for adhesives or can be disposed off.

U.S.Pat. No. 5,174,898 (1992) teaches a method of treating organic sludge in which the paint sludge is subjected to aerobic biodegradation with increased dry content of the resulting sludge and the latter is then subjected to anaerobic biological degradation. The sludge from the anaerobic bio stage can be dried to an inert granulate and drying vapours are recycled to the aerobic bio stage.

U.S.Pat.No.5,129,995 discloses a process and apparatus for the continuous pyrolytic decomposition of waste stream materials (e.g. paint sludge) in which the inorganic components are recovered and recycled into essentially the same source materials from which they originated. The organic components are collected in liquid or gaseous form, as pyro oil and pyro gas respectively.

U.S.Pat. No. 4,980,030 (1993) discloses a method for removing a portion of the water and liquid hydrocarbons from the sludge. The high solids sludge is then heated to remove the remaining water and hydrocarbons. The heating step is designed to cure the uncured polymeric paint resins.

U.S.Pat.No. 4,750,274 (1988) discloses the methods for continuous drying of sludge in rotary screw type indirect heat exchangers.

U.S.Pat.No. 4,432,837 (1984) discloses a process for recovering organic solvent from the paint residue. The resultant dried residue, provided it is suitably chemically inert, is potentially useful as filler in molded plastics ware.

UK Pat.No. 2048912 B (1983) discloses the process for the reutilization of paint sludge and particularly industrial paint sludge’s from spray booths.

U.S.Pat. No. 4,303,559 (1981) for reutilization of paint sludge includes the step of heating the resulting sludge to achieve agglomeration of the particles and thermosetting of the resin. The material thus obtained is used as building or insulating components.

U.S. Pat. No. 3736277 (1981) discloses reconstituting the sludge into ultra-fine pigment and filler particles suitable for reformulating with thermosetting binder resin and solvent to make up reusable primer paint.

IN247640 (3394/DEL/2005) discloses a process for conversion of the paint sludge back into a usable paint form.

377/DEL/2004 discloses process for conversion of waste paint sludge into bitumen blendable mixture useful for road building.

107/DEL/2002 discloses a process for the conversion of paint sludge into reusable paint, said process comprising drying the paint sludge by any conventional method, and soaking said dried sludge with a solvent mixture comprising essentially a mixture of toluene or benzene in an amount of 28 to 40 %, xylene in an amount of 22 to 38%, n-butyl alcohol or methyl isobutyl ketone in an amount of 10 to 25 %, and if desired one or more conventional resins, one or more conventional additives and stirring the resultant product so obtained at ambient temperature, said solvent mixture being present in an amount of 30 - 80% by weight of the sludge, milling the stirred mixture of paint sludge and solvent mixture and filtering to obtain reusable paint.

However, existing methods have ongoing problems because of complexity, difficulty or inefficient treatments particularly for paint sludge. The methods are further, cumbersome or employ harsh conditions, not suitable from safety point of view and are often low yielding.

Also, the methods such as incineration require government approved sites. The transportation of the waste to the disposal site also involves additional resources. Further the incineration method not only recycles the waste in the form of ashes but also consumes natural resources for incineration creating additional pollution.

Accordingly, there is a need to provide a simple cost effective process for treating the paint sludge in order to extract the reusable materials in an efficient manner and can be employed in various chemical industries.

Therefore, it is an objective of the present invention to provide a simple and efficient process for the treatment of paint sludge for recovering the heavy metals that can be reusable by various chemical industries.

The additional objective is to achieve a method for recycling of paint sludge without involving incinerators.

Summary of Present Invention:

In accordance with the above object, the present invention provides an innovative ecofriendly and clean technology of recycling and conversion of paint sludge, a hazardous waste into user friendly primers meeting customer’s specifications. Further the process of the present invention will avoid incineration of paint sludge, saving money and time taken to dispose the sludge at hazardous waste disposal sites.

In an aspect, the process for the treatment of paint sludge to obtain homogenous mixture of treated paint sludge comprises the following steps:
a) Subjecting the paint sludge for grinding in ball mill for 30 min. to reduce the particle size followed by soaking in aqueous organic solvent mixture for around 24 hr;
b) Centrifuging the soaked paint sludge for around 10 min. at 4000 RPM followed by vacuum oven drying at 1200C for 1 hr, to remove the liquid content;
c) Subjecting the oven dried paint sludge to uniform stirring about 1 hr at 500 RPM under High speed disperser and repeating the step(b) if necessary;
d) Subjecting the treated paint sludge for grinding in ball mill for 30 min to obtain homogenous mixture of treated paint sludge; and
e) converting the treated paint sludge in reusable forms selected from primer, paint and pigment tinters.

Alternately, the above process encompasses single step of rinsing and soaking treatment of the sludge with the use of minimum solvent and time.

In another aspect, the invention provides a process for preparation of primer from treated paint sludge which comprises the following steps:

a) Charging the ingredients such as polymeric resin, dispersing agent, pigments, solvent as per mill base calculation to the treated paint sludge in ball mill;
b) Dispersing the above mixture in cascading mechanism in ball mill for about 5-6 hr. till the fineness of grinding value is obtained to + 4 Hegmann gauge; and
c) Subjecting the dispersed mixture to letdown operation under high speed disperser with addition of remaining ingredients such as polymeric resin, solvent, thickening agent and driers as per let down calculation for 1 hr at 500 RPM in high speed disperser to obtain the primer.

Description of drawings:

Figure 1 depicts Energy dispersive X-ray techniques (EDAX), of crude paint sludge taken from the LPG gas cylinders along with composition of elements present in atomic weight % i.e. C: 50.99, O: 36.29 Mg: 3.83, Al: 0.76, Si: 1.58, Ca: 4.37, Ti: 1.07, Fe: 0.82, Au: 0.29,

Figure 2 depicts Energy dispersive X-ray techniques (EDAX) of treated paint sludge which shows definite substantial improvement with respect to composition of elements present in atomic weight % i.e. C:25.85, O:27.48, Mg: 12.51, Al: 7.46, Si:10.86, Ca: 9.40, Ti: 3.29, Fe: 1.72, Au: 1.43.

Detailed description of the invention:

The invention will now be described in detail in connection with certain preferred and optional embodiments, so that various aspects thereof may be more fully understood and appreciated.

In accordance with the above objects, the present invention provides an innovative eco-friendly and clean technology of recycling and conversion of paint sludge, a hazardous waste into user friendly primers meeting customer’s specifications. Further the process of the present invention will avoid incineration of paint sludge saving money and time taken to dispose the sludge at hazardous waste disposal sites.

As discussed above, paint sludge comprises heavy metals in addition to other ingredients. The good amount of Fe (iron) is a pre-requisite for primer manufacture.

The present inventors have observed upon careful analysis by Energy dispersive X-ray techniques (EDAX), of paint sludge taken from the LPG gas cylinders, the presence of low amount of % Fe as the same is contaminated with other ingredients devoid of Fe.

The initial analysis of crude paint sludge showed the following composition of elements present in atomic weight % i.e. C:50.99, O:36.29, Mg: 3.83, Al: 0.76, Si: 1.58, Ca: 4.37, Ti: 1.07, Fe: 0.82, Au: 0.29, as shown in figure 1.

Therefore, the present inventors have developed process to remove the other contaminants thereby enhance the percentage of iron in the paint sludge, so as to re-use the same for the manufacture of the primer.

Accordingly, the invention provides a process for the treatment of paint sludge to obtain homogenous mixture of treated paint sludge comprises the following steps:
a) Subjecting the paint sludge for grinding in ball mill for 30 min to reduce the particle size followed by soaking in aqueous, organic solvent mixture;
b) Centrifuging the soaked paint sludge for around 10 min. at 4000 RPM followed by vacuum oven drying at 120°C for 1 hr, to remove the liquid content.;
c) Subjecting the oven dried paint sludge to uniform stirring about 1 hr at 500 RPM under High speed disperser; repeating the step(b), if necessary;
d) Subjecting the treated paint sludge for grinding in ball mill for 30 min. to obtain homogenous mixture of treated paint sludge and
e) Converting the treated paint sludge in reusable forms selected from primer, paint, pigment tinters.

The treated paint sludge was again analyzed by Energy dispersive X-ray techniques (EDAX).

After treatment with aqueous, organic solvent, the treated paint sludge showed definite substantial improvement with respect to composition of elements present in atomic weight % i.e. C: 25.85, O: 27.48, Mg: 12.51, Al: 7.46, Si:10.86, Ca: 9.40, Ti: 3.29, Fe: 1.72, Au: 1.43 as shown in figure 2. The increased % of Fe is a pre-requisite for primer manufacture.

It is pertinent to mention that such elaborate study on treatment of paint sludge with carefully chosen “aqueous hydrophilic organic solvent” has not been studied hitherto. The careful, systematic and scientific study undertaken as in the present invention showed definite improvement in paint sludge composition obtained after treatment which was evaluated by Energy dispersive X-ray techniques (EDAX).

Earlier reports only briefly narrate utility of organic solvents, followed by water wash as two independent separate steps, to yield treated paint sludge with low yields of the required metal composition and no details of procedure employed, is available.

The innovative method developed in the present invention accomplishes task of quality enhancement of paint sludge in one single simple, ecofriendly and cost effective step, in maximum yield, without employing harsh conditions. The process developed is simple, eco- and plant-friendly.

The ratio of water: solvent (hydrophilic organic solvent) also plays crucial role in the treatment of the paint sludge. The hydrophilic organic solvents may be selected from the group consisting of methanol, Ethanol, Isopropyl Alcohol, Tetrahydrofuran, acetone, Acetonitrile, Ethyl acetate, N, N-Dimethylformamide, and Dimethyl Sulfoxide.

In a preferred embodiment, Methanol is considered as hydrophilic solvent as it is relatively cheaper and comes with quality.

The present inventors have identified that the Water: Methanol in a ratio of (9:1) at 2-10 volumes with regard to paint sludge weight facilitates substantial improvement with respect to composition of elements present in the sludge.

The next objective of the invention was to convert treated refined paint sludge into usable forms such as primer, paint, pigment tinters which is achieved by incorporation of suitable ingredients such as pigments, dispersing agents, polymeric resin, organic solvent, thickening agents, additives etc.

In one preferred embodiment, the invention provides a process for preparation of primer from treated paint sludge which comprises the following steps:

a) Charging the ingredients such as polymeric resin, dispersing agent, pigments, solvent as per mill base calculation to the treated paint sludge in ball mill;
b) Dispersing the above mixture in cascading mechanism in ball mill for about 5-6 hrs till the fineness of grinding value is obtained to + 4 Hegmann gauge; and
c) Subjecting the dispersed mixture to letdown operation under high speed disperser with addition of remaining ingredients such as polymeric resin, solvent, thickening agent, varnish, and driers as per let down calculation for 1 hr at 500 RPM in high speed disperser to obtain the primer.

The pigment used for the preparation of the primer in accordance with the invention is selected from the group consisting of red oxide pigment, zinc chrome, whiting, Lead chrome, Red Lead, Talc, Barytes.

The solvent may be selected from mineral turpentine oil, n-Butanol and the like. The dispersing agent used may be selected from soya lecithin and Tween-80. The resin may be selected from alkyd resin, Polyvinyl butyral Resin, Polyether resin and Epoxy resin. The varnish may be selected from Long oil linseed –tung oil modified Phenolic varnish. The thickening agent is clay gallant. The driers such as Lead Naphthenate and Cobalt Naphthenate are metal soaps or coordination compounds which accelerate paint/primer drying, thus shortening the total drying time.

The primer thus obtained after further processing was tested against virgin red oxide primer, and found to meet all specifications.

Thus in one preferred embodiment, the invention provides a process for conversion of the paint sludge into a primer which comprises:
a) Subjecting the paint sludge for grinding in ball mill for 30 min. to reduce the particle size followed by soaking in aqueous, hydrophilic organic solvent mixture;
b) Centrifuging the soaked paint sludge for around 10 min. at 4000 RPM followed by vacuum oven drying at 120°C for 1 hr;
c) Subjecting the oven dried paint sludge to uniform stirring about 1 hr at 500 RPM under High speed disperser and if necessary repeating the step (b);
d) Subjecting the treated paint sludge for grinding in ball mill for 30 min. to obtain homogenous mixture of treated paint sludge;
e) Charging the ingredients such as polymeric resin, dispersing agent, pigments, solvent as per mill base calculation to the treated paint sludge in ball mill;
f) Dispersing the above mixture in cascading mechanism in ball mill for about 5-6 hrs till the fineness of grinding value is obtained to + 4 Hegmann gauge; and
g) Subjecting the dispersed mixture to let down operation under high speed disperser with addition of remaining ingredients such as polymeric resin, solvent, thickening agent, varnish and driers as per let down calculation for 1 hr at 500 RPM in high speed disperser to obtain the primer.

Further the inventors have converted the refined paint sludge into different types of primers such as red oxide primer & other primers and the products obtained were compared with virgin grade and found that the primers obtained by the present process meets the desired specifications.

In another preferred embodiment, the treated paint sludge can be converted back into reusable paint and pigment tinters.

The following examples, which include preferred embodiments, will serve to illustrate the practice of this invention, it being understood that the particulars shown are by way of example and for purpose of illustrative discussion of preferred embodiments of the invention.

Example: 1
Treatment of crude paint sludge
Charge the crude paint sludge from LPG gas cylinders 500 gm in ball mill for grinding for 30 min to reduce the particle size. The paint sludge is then taken in a beaker and is soaked with aqueous solvents mixture (Water: Methanol) (90:10), 2 volume for around 24 hr. Soaked paint sludge is centrifuged for around 10 min. at 4000 RPM followed by vacuum oven drying at 1200C for 1 hr. This paint sludge is then taken for uniform stirring about 1 hr. at 500 RPM under High speed disperser and then centrifuged again for around 10 min. at 4000 RPM, followed by vacuum oven drying at 1200C for 1 hr. Treated paint sludge is then taken in ball mill for grinding for 30 min to obtain homogenous mixture.
Fe:082 gets enhanced to Fe: 1.72 as judged by EDAX.
Yield 271± 5 gm.
The above procedure encompasses single step of rinsing and soaking treatment to sludge with minimum time and minimum volume of aqueous solvent mixture.
Repeating the same procedure with Water : Methanol (80:20) yields 240 gm treated paint sludge.
Use of Water: Methanol (70:30) yields 220 gm treated paint sludge.
Use of Water: Methanol (50:50) yields 213 gm treated paint sludge.
Repeating the same procedure with Water : Acetone (90:10) yields 225 gm treated paint sludge,
Hence Water: Methanol (90:10) is considered as a preferred solvent mixture for treating paint sludge.

Example: 2
Similarly, the paint sludge 500 gm taken from different sources such as automotive industry, appliance industry and metal fabrication industry was individually treated by employing Water and Methanol as per the procedure described in example 1, to obtain homogenous mixture of sludge. The yield of the treated sludge in each case varies in the range of 220 gm to 270gms. The preferred solvent in each example is Water: Methanol in 90:10 ratios.

Example: 3
Process for preparation of metal primer
Charge other ingredients such as polymeric resin, dispersing agent, pigments, solvent as per mill base calculation with treated paint sludge in ball mill for the preparation of primer. Disperse this mixture in cascading mechanism in ball mill for about 5-6 hrs till the fineness of grinding value is obtained to + 4 Hegmann gauge. Then this dispersed mixture is taken for letdown operation under high speed disperser with addition of remaining ingredients such as polymeric resin, solvent and driers as per let down calculation at about 1 hr. at 500 RPM to prepared primer. See an Example: 4 (Stoving metal primer composition)

Example: 3a
Process for preparation of Stoving metal primer
The process is exactly same as narrated in Experiment: 3, except ingredients and their quantities, as narrated in example 4.

Example 3b
Process for preparation of Air drying primer,
The process is exactly same as narrated in Experiment: 3, except ingredients and their quantities, as narrated in example 5.
By emplying the similar process variety of primers can be prepared from the treated paint sludge as shown in examples 6 to 8.

EXAMPLE: 4 (Stoving Metal Primer composition)
Ingredients Weight %
Treated Paint Sludge 20.0
Red Iron Oxide 15.0
Zinc Chrome 5.0
Soya lecithin 0.4
Alkyd Resin (70% solid) 43.2
Mineral Turpentine Oil 15.0
6% Cobalt Naphthenate 0.4
24 % Lead Naphthenate 1.0
EXAMPLE: 5 (Air Drying Primer composition)
Ingredients Weight %
Treated Paint Sludge 25.4
Red Iron Oxide 25.0
Zinc Chrome 10.0
Whiting 5.0
Long oil linseed –tung oil
Modified Phenolic varnish 25.2
(60% in white spirit)
Mineral Turpentine Oil 8.1
6% Cobalt Naphthenate 0.1
24 % Lead Naphthenate 0.3
Clay gallant 0.5
n-Butanol 0.3

EXAMPLE: 6 (Single Pack Each Primer composition)
Ingredients Weight %
Treated Paint Sludge 7.0
Lead Chrome 2.0
Talc 1.4
Polyvinyl butyral Resin 9.0
Isopropanol 60.6
Methyl Ethyl Ketone 13.9
85% Phosphoric acid 2.9
Water 2.9

EXAMPLE: 7 (Metal Primer for galvanized steel work composition)
Ingredients Weight %
Treated Paint Sludge 40.4
Red Lead 39.0
Asbestine 4.0
Mineral Turpentine Oil 2.0
Acid refined linseed oil 13.9
6% Cobalt napthenate 0.7

EXAMPLE: 8 (Two pack primer for steel work composition)
Ingredients Weight %
Treated Paint Sludge 3.0
Red Iron Oxide 2.0
Zinc Chrome 5.0
Barytes 16.5
Talc 8.2
Asbestine 8.2
Polyether resin (90% in butyl acetate) 3.6
Castor Oil 6.2
Solid epoxy resin (diphenylol-propane based) 1.2
Cyclohexnone 25.1
Methyl ethyl ketone 6.3
Diphenyl methyl di-isocynate (60% in xylene) 14.7