AUTOMOTIVE PAINT REMOVER COMPOSITION AND METHOD OF MAKING

Abstract

A chemical composition and method of making and using are provided for paint removal and/or for adhesive removal. The chemical composition comprises THF and a solvent selected from the group consisting of methyl acetate, acetone, dimethyl carbonate, propylene carbonate, and 1-chloro-4 (trifluoromethyl) benzene, and a combination thereof.

Claims

1. A chemical composition comprising: tetrahydrofuran (THF), and a solvent selected from the group consisting of methyl acetate, acetone, dimethyl carbonate, propylene carbonate, and 1-chloro-4 (trifluoromethyl) benzene, and a combination thereof.

2. The chemical composition according to claim 1, wherein THF is present in an amount of 10 weight percent to 50 weight percent, based on the total weight of the composition.

3. The chemical composition according to claim 1, wherein the solvent is present in an amount of greater than 0 to 90 weight percent, based on the total weight of the composition.

4. The chemical composition according to claim 1, wherein the solvent is acetone.

5. The chemical composition according to claim 1, wherein the solvent is methyl acetate.

6. The chemical composition according to claim 1, wherein the solvent is a combination of acetone and methyl acetate.

7. The chemical composition according to claim 1, further comprising an additive selected from the group consisting of a thickener, a paraffin wax, a surfactant, an amine, dye, fumed silica, Butylated hydroxytoluene (BHT), anti-peroxide forming agents, diglycolamine, ammonia, methanol, and a combination thereof.

8. The chemical composition according to claim 7, wherein the amine is selected from the group consisting of aqua ammonia, monoethanolamine, diethanolamine, triethanolamine, diglycolamine, and a combination thereof.

9. The chemical composition according to claim 1, wherein the chemical composition is in a form of a liquid or an aerosol.

10. A method of using according to claim 1, comprising applying the composition of claim 1 to a paint and removing the paint.

11. A method of using according to claim 1, comprising applying the composition of claim 1 to a surface having an adhesive and removing the adhesive.

12. A chemical composition comprising: 10 weight percent to 50 weight percent of tetrahydrofuran (THF), greater than 0 weight percent to 90 weight percent of a solvent selected from the group consisting of an ester, a ketone, and a combination thereof, 0 weight percent to 2 weight percent of a thickener, 0.25 weight percent to 1 weight percent of a paraffin wax, 0.25 weight percent to 5 weight percent of a surfactant, and 0 weight percent to 5 weight percent of an amine, wherein weight percentages are based on the total weight of the composition.

13. The chemical composition according to claim 12, wherein the ester is selected from the group consisting of methyl acetate, ethyl acetate, butyl acetate, and a combination thereof.

14. The chemical composition according to claim 12, wherein the ketone is acetone.

15. The chemical composition according to claim 12, wherein the thickener is a cellulose ether thickener.

16. The chemical composition according to claim 12, wherein the amine is selected from the group consisting of an aqua ammonia, monoethanolamine, diethanolamine, triethanolamine, diglycolamine, and a combination thereof.

17. The chemical composition according to claim 12, further comprising an additive selected from the group consisting of a thickener, a paraffin wax, a surfactant, an amine, dye, fumed silica, Butylated hydroxytoluene (BHT), anti-peroxide forming agents, diglycolamine, ammonia, methanol, and a combination thereof.

18. The chemical composition according to claim 12, wherein the chemical composition is in a form of a liquid or an aerosol.

19. A method of using according to claim 12, comprising applying the composition of claim 12 to a paint and removing the paint.

20. A method of using according to claim 12, comprising applying the composition of claim 12 to a surface having an adhesive and removing the adhesive.

Description

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The following description of the embodiments of the present invention is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. The present invention has broad potential application and utility. The following description is provided herein solely by way of example for purposes of providing an enabling disclosure of the invention, but does not limit the scope or substance of the invention.

[0016] In an embodiment of the invention, a chemical composition comprising tetrahydrofuran (THF) is provided. Preferably, THF and at least one other solvent are used in combination. Non-limiting examples of a solvent include, but are not limited to, acetone, dimethyl carbonate, propylene carbonate, and 1-chloro-4 (trifluoromethyl) benzene, and a combination thereof. The chemical composition is suitable for chemically stripping and/or for removing a paint such as an automotive paint from a surface or paint from a surface of an aircraft. The chemical composition is also suitable for removal of an adhesive from a surface.

[0017] In a preferred embodiment, THF and one or both of methyl acetate and acetone are used in combination in the composition.

[0018] In an embodiment of the invention, a composition suitable for use as an automotive paint remover generally comprises tetrahydrofuran (THF) in a range of 10 weight percent to 50 weight percent, and an ester in a range of greater than 0 weight percent to 90 weight percent. Non-limiting examples of an ester include, but are not limited to, methyl acetate, ethyl acetate, butyl acetate, or a combination thereof. Methyl acetate is an example of a preferred ester. Weight percentages are based on the total weight of the composition.

[0019] In an embodiment of the invention, a composition suitable for use as an automotive paint remover generally comprises tetrahydrofuran (THF) in a range of 10 weight percent to 50 weight percent, and greater than 0 weight percent to 90 weight percent of a ketone. Non-limiting examples of ketones include, but are not limited to, acetone, dimethyl carbonate, propylene carbonate, or a combination thereof. Acetone is a preferred ketone.

[0020] In an embodiment of the invention, a composition suitable for use as an automotive paint remover comprises 10 weight percent to 50 weight percent of tetrahydrofuran (THF), 0 weight percent to 50 weight percent of an ester such as methyl acetate, ethyl acetate, or butyl acetate (with methyl acetate being a preferred ester), 0 weight percent to 90 weight percent of a ketone (with acetone being a preferred ketone), 0 weight percent to 2 weight percent of a thickener (preferably a cellulose ether thickener), 0.25 weight percent to 1 weight percent of a paraffin wax with a melting point range of 127 to 135? F., 0.25 weight percent to 5 weight percent of a nonionic or anionic surfactant, 0 weight percent to 5 weight percent of an amine such as aqua ammonia, monoethanolamine, diethanolamine, triethanolamine or diglycolamine as a chemical activator, with aqua ammonia being preferred.

[0021] The paraffin wax may serve as an evaporation retarder. The surfactant may serve to lower surface tension and for water washability of the paint remover.

[0022] Other additives may be present in the composition including, but not limited to, dye, fumed silica, Butylated hydroxytoluene (BHT), anti-peroxide forming agent, other thickeners, diglycolamine, ammonia, methanol, or combination thereof.

[0023] In an embodiment of the invention, the composition for use as an adhesive remover generally comprises tetrahydrofuran (THF) in a range of 10 weight percent to 20 weight percent. The composition further comprises a ketone in a range of 80 weight percent to 90 weight percent. Non-limiting examples of ketones include, but are not limited to, acetone, dimethyl carbonate, propylene carbonate, or a combination thereof. Acetone is a preferred ketone.

[0024] Other additives may be present in the composition including, but not limited to, dye, fumed silica, Butylated hydroxytoluene (BHT), anti-peroxide forming agent, other thickeners, diglycolamine, ammonia, methanol, or combination thereof.

[0025] The compositions of the present invention may be in a form of a liquid or an aerosol.

EXAMPLES

[0026] Experimental paint removers were tested on a hood from a 2004 Buick Le Saber purchased from a salvage yard in good condition with the factory paint intact. The hood was cleaned with a damp cloth and used in testing without further modifications.

[0027] A grid was marked on the hood with masking tape creating test cells approximately 1? in.?1? in. for the stripping trials. Each cell was labeled with the formula name and the duration time of the test. A series of formulas, listed in Table 1, using a combination of DMSO and one of the following solvents were tested on the hood: toluene, THF, 1,3 dioxolane and trans 1,2-dichloroethylene.

TABLE-US-00001 TABLE 1 Formulas based on a combination of DMSO and solvents toluene, THF, 1,3 dioxolane and trans 1,2 dichloroethylene. Formulation Component A B C D DMSO 24.75 24.75 24.75 24.75 toluene 24.75 THF 24.75 1,3 dioxolane 24.75 trans 1,2 dichloroethylene 24.75 acetone 42.95 42.95 42.95 42.95 cellulose ether thickener 1.25 1.25 1.25 1.25 nonionic surfactant 0.50 0.50 0.50 0.50 paraffin wax 0.80 0.80 0.80 0.80 aqua ammonia 26 Baume 5.00 5.00 5.00 5.00

[0028] Approximately 2 ml of the formula was applied to the hood and the performance was evaluated after 15, 30, and 60 minutes with number of layers of paint removed noted. After 60 minutes, formulas A, B, and D were only able to remove the clear coat.

[0029] To achieve better paint removing performance for automotive coatings, DMSO was removed from the formulation. Testing of the neat DMSO solvent on the automotive paint showed that DMSO failed to remove any of the paint after one hour.

[0030] A series of formulas based on THF or 1,3 dioxolane with acetone, methyl acetate and ammonia were formulated and are listed in Table 2.

TABLE-US-00002 TABLE 2 Series of formulas using THF or 1,3 dioxolane with acetone, methyl acetate and ammonia. Formulation Component E F G H I THF 50 50 50 1,3 dioxolane 50 50 Acetone 50 50 45 45 22.5 methyl acetate 22.5 aqua ammonia 26 Baume 5 5 5

[0031] The formulas were tested on the hood to compare the performance of THF to 1,3 dioxolane in removing automotive paint using the following procedure. A sponge was cut to approximately sized 1? in.?1? in.?? in. pieces were placed on each test cell to control evaporation and retain the solvent to the test area. For each sample, approximately 2 ml of the formula was applied to the sponge and a timer is started. Additional solvent was added to the sponges as needed to ensure that the solvent remained in contact with the surface of the test panel. At 15, 30, and 60 minutes the test area was scraped using a plastic scraper and evaluated for the effects on the coatings and the number of layers of paint removed. Results of the testing are listed in Table 3.

TABLE-US-00003 TABLE 3 Testing results of solvent blends on automotive hood. Formula Number 15 minutes 30 minutes 60 minutes E 0 1 1 F 0 1 1 G 0 1 3 H 0 1 3 I 0 1 3 0 - no effect on paint, 1 - clear coat removed, 2 - clear and color coats removed, 3 - clear, color and primer coat s removed.

[0032] As shown in Table 3, formulas G, H, and I, which contained ammonia, removed all layers of paint on the hood in 60 minutes. Formulas G and I, which were formulated with THF, was judged to have superior performance to Formula H which was formulated with 1,3 dioxolane. Based on the results of testing of the solvent mixtures in Table 3, paint remover formulas using THF, acetone, methyl acetate, and ammonia were formulated and are listed in Table 4.

TABLE-US-00004 TABLE 4 Paint remover formulas using THF, acetone, methyl acetate and ammonia. Formulation J K L M component (weight %) (weight %) (weight %) (weight %) THF 49.5 49.5 49.5 44 Acetone 43.50 21.75 46.12 methyl acetate 21.75 43.50 cellulose ether 1.25 1.25 1.25 0.1 thickener nonionic surfactant 0.50 0.50 0.50 1 paraffin wax 0.25 0.25 0.25 0.25 aqua ammonia 26 5.00 5.00 5.00 5.00 Baume dye 0.002 BHT 0.025 Hydrophilic fumed 3 silica Diglycolamine 0.5

[0033] As shown in Table 5, Formulas K and L containing methyl acetate removed all layers of paint in 30 minutes. Formula J containing acetone removed the clear coat and color coat in 30 in minutes and all layers of paint after 45 minutes.

TABLE-US-00005 TABLE 5 Testing results of paint removers formulated using THF and acetone, methyl acetate and ammonia on automotive hood. Formula Number 15 minutes 30 minutes 45 minutes 60 minutes J 0 3 3 3 K 0 2 3 3 L 0 3 3 3 0 - no effect on paint, 1 - clear coat removed, 2 - clear and color coats removed, 3 - clear, color and primer coat s removed.

[0034] It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements, will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention. Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments, adaptations, variations, modifications and equivalent arrangements.