CA1183434A - Chlorinated hydrocarbon protective and/or decorative coating stripping composition and method - Google Patents
Chlorinated hydrocarbon protective and/or decorative coating stripping composition and methodInfo
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- CA1183434A CA1183434A CA000384080A CA384080A CA1183434A CA 1183434 A CA1183434 A CA 1183434A CA 000384080 A CA000384080 A CA 000384080A CA 384080 A CA384080 A CA 384080A CA 1183434 A CA1183434 A CA 1183434A
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Abstract
CHLORINATED HYDROCARBON PROTECTIVE AND/OR DECORATIVE
COATING STRIPPING COMPOSITION AND METHOD
Abstract Described is a composition capable of stripping protec-tive and/or decorative coatings from a substrate comprising:
a major amount of a chlorinated hydrocarbon having from one to four carbon atoms;
a minor amount of a carboxylic acid accelerator useful for accelerating removal of the coating; and an effective amount of a penetrating amphoteric nitrogen containing surfactant.
The compositions are effective for stripping protective coatings as acrylic resins, epoxy resins, vinyl resins, poly-ester resins and polyurethane resins at ambient temperature.
COATING STRIPPING COMPOSITION AND METHOD
Abstract Described is a composition capable of stripping protec-tive and/or decorative coatings from a substrate comprising:
a major amount of a chlorinated hydrocarbon having from one to four carbon atoms;
a minor amount of a carboxylic acid accelerator useful for accelerating removal of the coating; and an effective amount of a penetrating amphoteric nitrogen containing surfactant.
The compositions are effective for stripping protective coatings as acrylic resins, epoxy resins, vinyl resins, poly-ester resins and polyurethane resins at ambient temperature.
Description
4;3~
Descri~tlon CHLORINATED ~DROCARBO~ PROTECTIVE AND~OR DECORATIV~`
- COATING Sl'RIPPING COMPOSITION AND METHOD
.
Background of the Invention The invention is concerned with compositions which are useful for removing or stripping protective and/or decorative coatings from substrates. The invention is also concerned with a method for removing said coatings.
In the manufacture of various commercial articles, it is often the p~actice to provide such articles with a protective and/or decorative film of a coating composition, such as a paint film, on the surface of the article. Coating composi-tions, such as paints, are generally construed in their normal broad terms to include a variety of film forming compositions which are applied in a variety of manners, such as spraying and dipping, and include various means of applica-tion such as with or without organic carriers, water based substances, electrostatic sprays, application using various means of energy for curing, such as heat, electron beam, in rared, W
and the like. In general, the paint or coating composition is comprised of a varie_y of film forming materials, including acrylic resins, epoxy resins, vinyl resins, polyester resins as alkyd resins, urethanes and the like. In addition, the substrate to which the application of the coating composition is made generally has a corrosion protective coating applied thereto, such as an iron phosphate coating composition of the Bonderite type (trademark of Oxy Metal Industries Corpora-tion).
In the course of manufacturing the articles, it becomes desirable to remove the protective coating for a number o~
reasons, such as an inappropriate or inadequate coating, some defect in the substrate and the like.
Use has been made in the past of chlorinated hydrocarbon paint stripping compositions. The difficulty with many of the previous paint stripping compositions are that they may take an inordinate amount of time or req~lire components that are undesirable from the point of view of having a detri-mental effect on the personnel who would be usin~ -the stripping compositions.
Canadian Patent: 708,141 teaches a paint stripping com-position which contain~ a halogenated carboxylic acid an organic sulfonic acid in an aqueous carrier.
U.S. 3 544 365 teaches the use of methylene chloride compositions containing triethanol amine lauryl sulfate anionic oil soluble surfactant plus formic acid as a composition for removing food residues.
U.S. 3 356 614 teaches a trichloroethylene composi-tion containing an activator which is a combination of acetic acid and trichloroacetic acid for film stripping purposes.
The above and other compositions used in the trade are not sufficiently efficient in removal of the coating compositions from the substrate in a sufficient period of time.
Summary of the Invention The invention is concerned with a composition capable of removing protective and/or decorative coatings from a substrate comprising a major amount of a chlorinated hydrocarbon of from one to four carbon atoms;
a minor amount o a carboxylic acid accelerator use-ful for accelerating the removal of the coating from the substrate; and an effecti~e amount of a penetrating amphoteric nitrogen containing surfactant.
To improve the efficiency of the composition, a sur-factant emulsifier of the SOX type and a corrosion in-hibitor of the acetylenic alcohol type may be used.
Description of Preferred Embodiment The composition of the present invention is capable of removing a variety of films rom substrates. The substrates ;~
3~
can be an~ o~ the normal substr~tes encountered ln industry, such as iron, example steel, such as cold rolled steel or stainless steel, or light metals, such as al-~inum, titaniuTn, and most alloys thereof. In general, the su~strate that has S the protective and/or decorative coating applied thereto which is to be removed is dipped into a vat containing the coating stripping composition of the present invention. This i5 normally performed at ambient ~emperature and pressure, although higher temperatures up to the boiling point of the composition could be employed. Generally no agitation is employed, although it is to be appreciated that for increased efficiency, agitation may be deemed desirable when a particularly adhesive composition is to be removed from a substrate.
In addition to the components which have been described above, other additional components are used in the coating composition to improve the overall efficiency. Such compo-nents are a combination of wax and aromatic compounds which assist in the application of the composition to the substrate and thereby assist in the removal. The wax and aromatic compound also retard evaporation of the stripping composition Materials such as aromatic hydrocarbons~ as xylene, toluene, and other alkylated aromatics may be employed. A paraffinic wax may likewise be used.
The acetylenic alcohol that is employed in the present case is one that inhibits corrosion of the substrate to which the stripping CompositiGn is to be applied. Suitable acety-lenic alcohols are hexynol, ethyloctynol, ethynyl cyclohexy-nol, methylbutynol, methylpentynol and the like.
The acid accelerator that is useful in the present application is a carboxylic acid that is liquid at ambient and containing from one to twelve carbon atoms. A preferred carboxylic acid is a halogenated carboxylic acid, such as the chlorinated material. Suitable carboxylic acids are formic, acetic, proprionic, butyric and the like, while the haloge-nated acids are chloroacetic, trichloroacetic and the li~e.
It is most preferred that a combination of the acids be ~ ~ _4_ employed, such as the combination of Eormic acid and tri-chloroacetic acid used in amounts of one part formic acid to one to ten parts trichloroacetic acid.
~mulsifiers of the organic So~ type may be employed such as sulfurous, sulfonic and sulfuric acids and the like, as well as the alkali salts thereof, such as sodium, potassium and the like. The SOX emulsifiers that are used are generally long chain substances containing upwards of twenty-two carbon atoms. Suitable emulsifiers of the SOX
type are petroleum sulfonate, sulfates of alcohol, sulfates of ethoxylated alcohol, sul~ates and sulfonates of ethoxylated alkyl phenols, sulfates of fatty esters, sulfates and sulfonates of oils and fatty acids, sulfon-ates of alkyl aryls, sulfonates of benzene, toluene and xylene, sulfonates of condensed naphthalenes, sulfonates of dodecyl and tridecyl benzene, sulfonates of naphthalene and alkyl naphthalene and the like.
The penetratin~ amphoteric nitrogen containing sur-factant is one that is useful for improving the efficiency of the stripping composition. While one does not wish to be held to any theory, it is believed that the amphoteric nitrogen containing surfactant has a tendency to penetrate the film to be removed, thereby allowing for destruction and removal of the coating cornposition or film from the substrate. Suitable amphoteric nitro~en containin~ sur-factants are materials of the Aromox DMC-W type (trademark of Armour Industrial Chemical Company for dimethyl coco-amine oxide), materials such as the Miranol C2M-SF type (trademark of Miranol Chemical Company for dicarboxylic coconut amine derivative disodium salt), as well as the pyridine arnphoteric type and the irnadazoline amphoteric type. Additional usefu~ amphoteric materials are lauryl myristyl amido propyl betaine, cocamidopropyl betaine, cocamidopropyl hydroxy sultaine, cocobetaine, disodium lauriminopropionate, disodium tallow-iminodipropionate, tallow-amidopropyl hydroxy sultaine, tallow betaine. By "amphoteric' is meant the ability to behave as an acid or a base.
3~3~
Listed below is a recitation o~ the components of the composition of the present invention and a preferred range of the components:
INDE~ FOR TABLES I--IV
Ancor OW-l is a trademark of Air Products for a material containing major amounts of hexynol.
Armohib 31 is an acid inhibitor useful in metal cleaning and pickling which is an aliphatic amine (trademark of Armour Industrial Chemical Company).
Petronate L is a sodium petroleum sulfonate of the anionic type (trademark of Witco Chemical Company).
Pyronate 40 is a petroleum sulfonate (trademark of Witco Chemical Company).
Tergitol 15-S-15 is a polyeth~lene glycol ether of linear alkyl alcohol of the non-ionic type beiny a paste (trademark of Union Carbide).
Sulfonic LF-7 is an alkyl polyoxyalkylene ether of a non-ionic type having an HLB rating of 12 (HLB Index meaning hydrophylic lipophylic balance ) (trademark of Jefferson Chemical Company Inc.).
Plurafac D-25 is modified oxyethylated straight chain alcohol of a non-ionic type with an HLB Index of 11 (trademark of BASF Wyandotte).
Calsoft Las-99 is linear alkyl benzene sulfonic acid of the anionic type (trademark of Pilot Chemical Company).
Aromox DCM-W i9 dimethyl cocoamine oxide of the cationic type being a liquid ~trademark of Armak Industrial Chemical of Armour Industrial Chemical Corp~ration).
Morco M-70 which is sodium petroleum sulfonate of the anionic type (trademark o Marathon Monco Company).
Tergitol TM~-10 is a trimethyl nonyl polyethylene glycol ether of the non-ionic type, HLB Index of 1 (trademark of Union Carbide).
,~
i.: .
~ 3434 TA3LE I ~ PROTECTIVE AND/OR ~ECO~TI~E
COATING Sl'RIPPING COMPOS[TION
Range ~Percent Preferred Prior Art sv Wei~ht (PBW)] Ranqe (PBW) (PBW) ~ -. _ . .
Methylene Chloride at least 51 70 to ~0 83.0 Xylene 1 to 10 2 to 4 2.5 Wax .1 to 3 .5 to 1 0.5 Calsoft Las-99 1 to 10 4 to 8 Aromox DMC-W .5 to 10 1 to 5 Deionized Water 1 to 20 5 to 15 Armohib 31 5 to 5 1 1.0 Propargyl Alcohol .1 to 10 1 to 3 Petronate L 1 to 10 1 to 3 2.0 Pyronate 40 1 to 10 1 to 3 ~ormic Acid 1 to 15 1 to 10 7.0 Trichloroacetic Acid 1 to 20 5 to 15 Tergitol 15-S-1~ 4.0 The composition as used by the consumer generally has a pH of about 1.
The composition can be prepared in a number of ways.
Generally, however, the first three components are mixed together and then the LAS-99 is blended thereto. Thereafter, the remaining components are added in the order they are listed in Table I.
H~ving described the invention above, listed below are detalled aspects thereof wherein all parts are parts by weight and temperatures are in degrees Fahrenheit unless otherwise indicated.
Examples In the following working examples, the compositions used were to remove a cured acrylic resin film. The resins used were Duracron ~00 (trademark of PPG for acrylic resin) for examples in Table II and DuPont AP-3 acrylic resin for examples in Tables III and IV. The reslns were applied onto 35 a test panel of steel having 3Onderite 1000 thereon (trademark of Oxy ~etal Industries for an iron phosphate conversion coating). The panels were dipped into the composition at ambient to detenmine the paint removal efficiency thereof.
~83434 TABLE II
Prior ExamDles: A B C D E F Art Methylene Chloride81.0 81.082.081.0 81.0 81.0 83.0 5 Xylene 2.5 2.52.5 2.5 2.52.5 2.5 Wax 0.5 0.50.5 0.5 0.50.5 0.5 Fo~r~ic Acid 7.0 7.07.0 7.0 7.07.0 7.0 Deionized Water 2.0 2.02.0 2.0 2.02.0 ---Armohib 31 1.0 1.01.0 1.0 1.01.0 1.0 10 Petronate L 2.0 Tergitol 15-S-15 4.0 Surfonic LF-7 6.0 Pl~lrafac D-25 6.0 Calsoft Las-99 5.0 15 Aromox DMC-W 6.0 Morco M-70 6.0 Tergitol T~ l-10 6.0 Percen-t of film N.E. N.E.N.E. 100~100~6100% 109 stripped in time 20 20 20 12 28 17.5 10 20 (min-) min. min.min. min.min.min. min.
TABLE III
Examples: G H
Methylene Chloride76.0 75.5 73.5 Xylene 4.0 2.54.0 25 Wax 1.0 0.51.0 Calsoft Las-99 5.0 4.05.0 Aromox DMC-W 2.0 2.02.0 Deionized Water 2.0 2.02.0 Armohib 31 --- 1.0 ---30 Propargyl Alcohol 1.0 --- 1.0 Petronate L --- 2.0 ---Pyconate 40 --- 1.51.5 Formic Acid 9.0 --- 2.0 Tricholoracetic Acid --- 9.0 8.0 -35 Percent of film N.E. 100%10096 stripped in time 1010.75 6~
(min.) rr.in. min. min.
rABLE IV
E~amples: ~ _K L
Metylene Chloride 73.5 73.0 74.5 Xylene~.0 4.0 2.5 Wax 1.0 1.0 0.5 Armohib 31~ ~ 1.0 Ancor OW~ 1.0 ---Calsoft Las-995.0 7.0 4.0 Aromox ~C-W2.0 2.0 2.0 10 Pyconate 401.5 ___ 1.5 ~eionized Water2.0 2.0 2.0 Formic Acid2.0 2.0 2.0 Trichloroacetic Acid 8.0 8.0 ~.0 Propargyl Alcohol 1.0 --- ---15 Petronate L_-~~ ~~~ 2.0 Percent of film 100~ 100% 100%
stripped in time 6~ 4~ 9.6 (min.)min. min. min.
N.E. represents "no effect".
The test results reflect time to remove the film of acrylic resin.
It is perfectly clear that the compositions using the amphoteric nitrogen containing substance (Aromox type) were clearly superior in their effeciency of removing the pro-tective coating. Note that the prior art W2S able to removeonly 10% of the acrylic film in a ten minute period of time.
Note also that improved efficiency was obtained when the combination of formic acid and trichloroacetic acid was used in conjunction with the nitrogen containing amphoteric surfactant.
It should also be noted that improved stripping efficiency is obtained when the acetylenic alcohol corrosion inhibitor (Ancor OW-l) is usedO
Descri~tlon CHLORINATED ~DROCARBO~ PROTECTIVE AND~OR DECORATIV~`
- COATING Sl'RIPPING COMPOSITION AND METHOD
.
Background of the Invention The invention is concerned with compositions which are useful for removing or stripping protective and/or decorative coatings from substrates. The invention is also concerned with a method for removing said coatings.
In the manufacture of various commercial articles, it is often the p~actice to provide such articles with a protective and/or decorative film of a coating composition, such as a paint film, on the surface of the article. Coating composi-tions, such as paints, are generally construed in their normal broad terms to include a variety of film forming compositions which are applied in a variety of manners, such as spraying and dipping, and include various means of applica-tion such as with or without organic carriers, water based substances, electrostatic sprays, application using various means of energy for curing, such as heat, electron beam, in rared, W
and the like. In general, the paint or coating composition is comprised of a varie_y of film forming materials, including acrylic resins, epoxy resins, vinyl resins, polyester resins as alkyd resins, urethanes and the like. In addition, the substrate to which the application of the coating composition is made generally has a corrosion protective coating applied thereto, such as an iron phosphate coating composition of the Bonderite type (trademark of Oxy Metal Industries Corpora-tion).
In the course of manufacturing the articles, it becomes desirable to remove the protective coating for a number o~
reasons, such as an inappropriate or inadequate coating, some defect in the substrate and the like.
Use has been made in the past of chlorinated hydrocarbon paint stripping compositions. The difficulty with many of the previous paint stripping compositions are that they may take an inordinate amount of time or req~lire components that are undesirable from the point of view of having a detri-mental effect on the personnel who would be usin~ -the stripping compositions.
Canadian Patent: 708,141 teaches a paint stripping com-position which contain~ a halogenated carboxylic acid an organic sulfonic acid in an aqueous carrier.
U.S. 3 544 365 teaches the use of methylene chloride compositions containing triethanol amine lauryl sulfate anionic oil soluble surfactant plus formic acid as a composition for removing food residues.
U.S. 3 356 614 teaches a trichloroethylene composi-tion containing an activator which is a combination of acetic acid and trichloroacetic acid for film stripping purposes.
The above and other compositions used in the trade are not sufficiently efficient in removal of the coating compositions from the substrate in a sufficient period of time.
Summary of the Invention The invention is concerned with a composition capable of removing protective and/or decorative coatings from a substrate comprising a major amount of a chlorinated hydrocarbon of from one to four carbon atoms;
a minor amount o a carboxylic acid accelerator use-ful for accelerating the removal of the coating from the substrate; and an effecti~e amount of a penetrating amphoteric nitrogen containing surfactant.
To improve the efficiency of the composition, a sur-factant emulsifier of the SOX type and a corrosion in-hibitor of the acetylenic alcohol type may be used.
Description of Preferred Embodiment The composition of the present invention is capable of removing a variety of films rom substrates. The substrates ;~
3~
can be an~ o~ the normal substr~tes encountered ln industry, such as iron, example steel, such as cold rolled steel or stainless steel, or light metals, such as al-~inum, titaniuTn, and most alloys thereof. In general, the su~strate that has S the protective and/or decorative coating applied thereto which is to be removed is dipped into a vat containing the coating stripping composition of the present invention. This i5 normally performed at ambient ~emperature and pressure, although higher temperatures up to the boiling point of the composition could be employed. Generally no agitation is employed, although it is to be appreciated that for increased efficiency, agitation may be deemed desirable when a particularly adhesive composition is to be removed from a substrate.
In addition to the components which have been described above, other additional components are used in the coating composition to improve the overall efficiency. Such compo-nents are a combination of wax and aromatic compounds which assist in the application of the composition to the substrate and thereby assist in the removal. The wax and aromatic compound also retard evaporation of the stripping composition Materials such as aromatic hydrocarbons~ as xylene, toluene, and other alkylated aromatics may be employed. A paraffinic wax may likewise be used.
The acetylenic alcohol that is employed in the present case is one that inhibits corrosion of the substrate to which the stripping CompositiGn is to be applied. Suitable acety-lenic alcohols are hexynol, ethyloctynol, ethynyl cyclohexy-nol, methylbutynol, methylpentynol and the like.
The acid accelerator that is useful in the present application is a carboxylic acid that is liquid at ambient and containing from one to twelve carbon atoms. A preferred carboxylic acid is a halogenated carboxylic acid, such as the chlorinated material. Suitable carboxylic acids are formic, acetic, proprionic, butyric and the like, while the haloge-nated acids are chloroacetic, trichloroacetic and the li~e.
It is most preferred that a combination of the acids be ~ ~ _4_ employed, such as the combination of Eormic acid and tri-chloroacetic acid used in amounts of one part formic acid to one to ten parts trichloroacetic acid.
~mulsifiers of the organic So~ type may be employed such as sulfurous, sulfonic and sulfuric acids and the like, as well as the alkali salts thereof, such as sodium, potassium and the like. The SOX emulsifiers that are used are generally long chain substances containing upwards of twenty-two carbon atoms. Suitable emulsifiers of the SOX
type are petroleum sulfonate, sulfates of alcohol, sulfates of ethoxylated alcohol, sul~ates and sulfonates of ethoxylated alkyl phenols, sulfates of fatty esters, sulfates and sulfonates of oils and fatty acids, sulfon-ates of alkyl aryls, sulfonates of benzene, toluene and xylene, sulfonates of condensed naphthalenes, sulfonates of dodecyl and tridecyl benzene, sulfonates of naphthalene and alkyl naphthalene and the like.
The penetratin~ amphoteric nitrogen containing sur-factant is one that is useful for improving the efficiency of the stripping composition. While one does not wish to be held to any theory, it is believed that the amphoteric nitrogen containing surfactant has a tendency to penetrate the film to be removed, thereby allowing for destruction and removal of the coating cornposition or film from the substrate. Suitable amphoteric nitro~en containin~ sur-factants are materials of the Aromox DMC-W type (trademark of Armour Industrial Chemical Company for dimethyl coco-amine oxide), materials such as the Miranol C2M-SF type (trademark of Miranol Chemical Company for dicarboxylic coconut amine derivative disodium salt), as well as the pyridine arnphoteric type and the irnadazoline amphoteric type. Additional usefu~ amphoteric materials are lauryl myristyl amido propyl betaine, cocamidopropyl betaine, cocamidopropyl hydroxy sultaine, cocobetaine, disodium lauriminopropionate, disodium tallow-iminodipropionate, tallow-amidopropyl hydroxy sultaine, tallow betaine. By "amphoteric' is meant the ability to behave as an acid or a base.
3~3~
Listed below is a recitation o~ the components of the composition of the present invention and a preferred range of the components:
INDE~ FOR TABLES I--IV
Ancor OW-l is a trademark of Air Products for a material containing major amounts of hexynol.
Armohib 31 is an acid inhibitor useful in metal cleaning and pickling which is an aliphatic amine (trademark of Armour Industrial Chemical Company).
Petronate L is a sodium petroleum sulfonate of the anionic type (trademark of Witco Chemical Company).
Pyronate 40 is a petroleum sulfonate (trademark of Witco Chemical Company).
Tergitol 15-S-15 is a polyeth~lene glycol ether of linear alkyl alcohol of the non-ionic type beiny a paste (trademark of Union Carbide).
Sulfonic LF-7 is an alkyl polyoxyalkylene ether of a non-ionic type having an HLB rating of 12 (HLB Index meaning hydrophylic lipophylic balance ) (trademark of Jefferson Chemical Company Inc.).
Plurafac D-25 is modified oxyethylated straight chain alcohol of a non-ionic type with an HLB Index of 11 (trademark of BASF Wyandotte).
Calsoft Las-99 is linear alkyl benzene sulfonic acid of the anionic type (trademark of Pilot Chemical Company).
Aromox DCM-W i9 dimethyl cocoamine oxide of the cationic type being a liquid ~trademark of Armak Industrial Chemical of Armour Industrial Chemical Corp~ration).
Morco M-70 which is sodium petroleum sulfonate of the anionic type (trademark o Marathon Monco Company).
Tergitol TM~-10 is a trimethyl nonyl polyethylene glycol ether of the non-ionic type, HLB Index of 1 (trademark of Union Carbide).
,~
i.: .
~ 3434 TA3LE I ~ PROTECTIVE AND/OR ~ECO~TI~E
COATING Sl'RIPPING COMPOS[TION
Range ~Percent Preferred Prior Art sv Wei~ht (PBW)] Ranqe (PBW) (PBW) ~ -. _ . .
Methylene Chloride at least 51 70 to ~0 83.0 Xylene 1 to 10 2 to 4 2.5 Wax .1 to 3 .5 to 1 0.5 Calsoft Las-99 1 to 10 4 to 8 Aromox DMC-W .5 to 10 1 to 5 Deionized Water 1 to 20 5 to 15 Armohib 31 5 to 5 1 1.0 Propargyl Alcohol .1 to 10 1 to 3 Petronate L 1 to 10 1 to 3 2.0 Pyronate 40 1 to 10 1 to 3 ~ormic Acid 1 to 15 1 to 10 7.0 Trichloroacetic Acid 1 to 20 5 to 15 Tergitol 15-S-1~ 4.0 The composition as used by the consumer generally has a pH of about 1.
The composition can be prepared in a number of ways.
Generally, however, the first three components are mixed together and then the LAS-99 is blended thereto. Thereafter, the remaining components are added in the order they are listed in Table I.
H~ving described the invention above, listed below are detalled aspects thereof wherein all parts are parts by weight and temperatures are in degrees Fahrenheit unless otherwise indicated.
Examples In the following working examples, the compositions used were to remove a cured acrylic resin film. The resins used were Duracron ~00 (trademark of PPG for acrylic resin) for examples in Table II and DuPont AP-3 acrylic resin for examples in Tables III and IV. The reslns were applied onto 35 a test panel of steel having 3Onderite 1000 thereon (trademark of Oxy ~etal Industries for an iron phosphate conversion coating). The panels were dipped into the composition at ambient to detenmine the paint removal efficiency thereof.
~83434 TABLE II
Prior ExamDles: A B C D E F Art Methylene Chloride81.0 81.082.081.0 81.0 81.0 83.0 5 Xylene 2.5 2.52.5 2.5 2.52.5 2.5 Wax 0.5 0.50.5 0.5 0.50.5 0.5 Fo~r~ic Acid 7.0 7.07.0 7.0 7.07.0 7.0 Deionized Water 2.0 2.02.0 2.0 2.02.0 ---Armohib 31 1.0 1.01.0 1.0 1.01.0 1.0 10 Petronate L 2.0 Tergitol 15-S-15 4.0 Surfonic LF-7 6.0 Pl~lrafac D-25 6.0 Calsoft Las-99 5.0 15 Aromox DMC-W 6.0 Morco M-70 6.0 Tergitol T~ l-10 6.0 Percen-t of film N.E. N.E.N.E. 100~100~6100% 109 stripped in time 20 20 20 12 28 17.5 10 20 (min-) min. min.min. min.min.min. min.
TABLE III
Examples: G H
Methylene Chloride76.0 75.5 73.5 Xylene 4.0 2.54.0 25 Wax 1.0 0.51.0 Calsoft Las-99 5.0 4.05.0 Aromox DMC-W 2.0 2.02.0 Deionized Water 2.0 2.02.0 Armohib 31 --- 1.0 ---30 Propargyl Alcohol 1.0 --- 1.0 Petronate L --- 2.0 ---Pyconate 40 --- 1.51.5 Formic Acid 9.0 --- 2.0 Tricholoracetic Acid --- 9.0 8.0 -35 Percent of film N.E. 100%10096 stripped in time 1010.75 6~
(min.) rr.in. min. min.
rABLE IV
E~amples: ~ _K L
Metylene Chloride 73.5 73.0 74.5 Xylene~.0 4.0 2.5 Wax 1.0 1.0 0.5 Armohib 31~ ~ 1.0 Ancor OW~ 1.0 ---Calsoft Las-995.0 7.0 4.0 Aromox ~C-W2.0 2.0 2.0 10 Pyconate 401.5 ___ 1.5 ~eionized Water2.0 2.0 2.0 Formic Acid2.0 2.0 2.0 Trichloroacetic Acid 8.0 8.0 ~.0 Propargyl Alcohol 1.0 --- ---15 Petronate L_-~~ ~~~ 2.0 Percent of film 100~ 100% 100%
stripped in time 6~ 4~ 9.6 (min.)min. min. min.
N.E. represents "no effect".
The test results reflect time to remove the film of acrylic resin.
It is perfectly clear that the compositions using the amphoteric nitrogen containing substance (Aromox type) were clearly superior in their effeciency of removing the pro-tective coating. Note that the prior art W2S able to removeonly 10% of the acrylic film in a ten minute period of time.
Note also that improved efficiency was obtained when the combination of formic acid and trichloroacetic acid was used in conjunction with the nitrogen containing amphoteric surfactant.
It should also be noted that improved stripping efficiency is obtained when the acetylenic alcohol corrosion inhibitor (Ancor OW-l) is usedO
Claims (15)
1. A liquid composition capable of removing protective and or decorative coatings from a substrate comprising:
(a) a major amount of a chlorinated hydrocarbon of from one to four carbon atoms;
(b) a minor amount of an acid accelerator useful for accelerating the removal of the coating, which acid accelerator is a combination of a halogenated carboxylic acid and a carboxylic acid in a weight ratio of from about 0.5 to 5:1 halogenated carboxylic acid: carboxylic acid; and (c) an effective amount of a penetrating amphoteric nitrogen containing surfactant.
(a) a major amount of a chlorinated hydrocarbon of from one to four carbon atoms;
(b) a minor amount of an acid accelerator useful for accelerating the removal of the coating, which acid accelerator is a combination of a halogenated carboxylic acid and a carboxylic acid in a weight ratio of from about 0.5 to 5:1 halogenated carboxylic acid: carboxylic acid; and (c) an effective amount of a penetrating amphoteric nitrogen containing surfactant.
2. The composition of claim 1 wherein components (a), (b) and (c) are as follows: (a) 51 to 99 percent by weight PBW ; (b) 1 to 20 PBW; and (c) .5 to 15 PBW, the combination of (a), (b) and (c) equaling 100%.
3. The composition of claim 2 further comprising a liquid corrosion inhibiting acetylenic alcohol of from .1 to 5 PBW.
4. The composition of claim 2 further comprising an organic SOX emulsifier in an amount from about .5 to 10 PBW.
5. The composition of claim 1 wherein the hydrocarbon is methylene chloride in an amount from about 70 to 80 PBW.
6. The composition of claim 1 further comprising an aromatic hydrocarbon in an amount from about 2 to 4 PBW.
7. The composition of claim 1 further comprising a wax in an amount from about 0.5 to 3 PBW.
8. The composition of claim 1 further comprising a linear alkyl benzene sulfonic acid of the anionic type in an amount from about 1 to 10 PBW.
9. The composition of claim 1 wherein the amphoteric surfactant is a dimethyl cocoamine oxide in the liquid state in an amount from about 1 to 5 PBW.
10. The composition of claim 1 further comprising a corrosion inhibitor which is an aliphatic amine in an amount of about 0.5 to about 5 PBW.
11. The composition of claim 1 wherein the accelerator acid is a mixture of formic acid and trichloroacetic acid.
12. A method of removing protective and/or decorative coatings from a substrate comprising placing the liquid stripping composition of claim 1 in contact with the coated substrate for a period of time sufficient to strip said coating from the substrate and removing the substrate from the stripping composition.
13. The method of claim 12 wherein the protective coating composition is selected from the group consisting of acrylic resins, epoxy resins, vinyl resins, polyester resins, polyurethane resins and mixtures thereof.
14. The method of claim 13 wherein the protective coating is an acrylic resin.
15. The method of claim 13 wherein the period of time for removing the coating ranges from about 1 to 30 minutes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18524580A | 1980-09-08 | 1980-09-08 | |
| US185,245 | 1980-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1183434A true CA1183434A (en) | 1985-03-05 |
Family
ID=22680198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000384080A Expired CA1183434A (en) | 1980-09-08 | 1981-08-18 | Chlorinated hydrocarbon protective and/or decorative coating stripping composition and method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5776065A (en) |
| CA (1) | CA1183434A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4445939A (en) * | 1982-08-19 | 1984-05-01 | Hodson James V | Stripping and conditioning solutions for treating coated substrates and method for their use |
| JP3117808B2 (en) * | 1992-09-25 | 2000-12-18 | 日産自動車株式会社 | Coating removal method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5538822A (en) * | 1978-09-11 | 1980-03-18 | Masatoshi Shimizu | Agent for releasing coating and adhesive |
-
1981
- 1981-08-18 CA CA000384080A patent/CA1183434A/en not_active Expired
- 1981-08-26 JP JP13390081A patent/JPS5776065A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5776065A (en) | 1982-05-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |