GB2299812A - A paint stripper - Google Patents
A paint stripper Download PDFInfo
- Publication number
- GB2299812A GB2299812A GB9507909A GB9507909A GB2299812A GB 2299812 A GB2299812 A GB 2299812A GB 9507909 A GB9507909 A GB 9507909A GB 9507909 A GB9507909 A GB 9507909A GB 2299812 A GB2299812 A GB 2299812A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- dmso
- paint stripper
- paint
- ether
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D9/00—Chemical paint or ink removers
- C09D9/005—Chemical paint or ink removers containing organic solvents
Abstract
A paint stripper based on dimethylsulfoxide (DMSO), is characterized by containing 20 to 90% by weight of DMSO and 10 to 80% by weight of an alkyl glycol ether or an alkyl diglycol ether containing 2 to 8 carbon atoms in the alkyl group and one hydroxyl group. The ether may be a butyl diglycol ether. Other components may be present such as an alkylbenzene sulphonate, an acid, silica, gums, cellulose derivatives, clays or zeolites.
Description
A paint stripper
This invention relates to a paint stripper based on dimethylsulfoxide (DMSO).
A dissolving paint stripper of this type is known.
It is applied to the dried paint coating and, after a short or long contact time, facilitates its removal from the substrate.
CH-PS 670 832 describes an organic desizing, dissolving and paint removing composition free from chlorinated hydrocarbons. According to Example 4, this composition consists of 20t DMSO, 10% butyl glycolether, 2.5t alkylhydroxyalkyl cellulose, 1.5 alkylbenzenesulfonate, 10% swelling agent (tetrahydrofuran and tetrahydrofurfuryl alcohol), 50% resin solvent (acetates and butyrolactone) and 6% evaporation retarders (paraffins and tetralin).
Published Japanese patent application 59/155474 also describes a paint stripper based on dimethylsulfoxide.
According to claim 6, it consists of 50 parts of dimethylsulfoxide, 30 parts of glycerol and 20 parts of polyvinyl alcohol. According to claim 2, the viscosity of the stripper is said to be adjusted by thickeners to a value of 100 to 10,000 cpoises/250C and its thixotropy to a value of 1.1 to 10 (T.I. value).
European patent application EP 0 490 726 describes a paint stripper essentially consisting of the following components: 1 to 20% by volume of DMSO and 80 to 99 by volume of at least one ether from the group consisting of methyl-t-butylether, diethyl ether, t-amyl methylether, tetrahydrofuran and dioxane.
European patent application EP 0 573 339 also describes a paint stripper containing a) 1 to 99% by volume of a polar aprotic solvent and b) 99 to 1% of a certain ether containing at least one
methoxy group.
Ethers specifically mentioned include 1,2-dimethoxybenzene, 1,3-dimethoxybenzene, 1,4-dimethoxybenzene, 1,2,3trimethoxybenzene, 2-methoxy-1,3-dioxolane, 2-methoxy3,4-dihydropyran, 2,5-dimethoxytetrahydrofuran, ethylene glycol dimethylether, diethylene glycol dimethylether and 1-t-butoxy-2-methoxyethane.
These known paint strippers have the disadvantage that they are not sufficiently effective. In particular, they run down vertical paint surfaces before they have sufficiently softened them.
The solution provided by the invention is defined in the claims. It is based in particular on the choice of the co-solvent alkyl glycol ether or alkyl diglycol ether containing at least one OH group, the alkyl group containing 2 to 8 carbon atoms and, more particularly, 3 to 6 carbon atoms. The stripper contains 20 to 90% by weight of DMSO and 10 to 80% by weight of ether.
Other constituents of the stripper may be: - 0 to 5% by weight and more particularly 0.1 to 3% by
weight of at least one thixotropic agent, - 0 to 5% by weight and more particularly 0.5 to 3.0t by weight of at least one thickener, for example
based on cellulose, clay, starch, gum or a swellable
polymer, more particularly based on cellulose
derivatives, such as ethoxyethyl cellulose, or
hydroxy propyl methyl cellulose - 0 to 2% by weight and more particularly 0.5 to 1% by
weight of at least one surfactant, - 0 to 0.1t by weight of at least one evaporation
retarder, - 0 to 0.1t by weight of at least one dye, - 0 to 0.5 by weight of at least one corrosion
inhibitor and - 0 to 3% by weight of at least one activating acid or
base.
Chlorinated hydrocarbons and N-Methyl-2 -pyrrolidone (NMP) are specifically ruled out as co-solvents.
The function of the thixotropic agent is to cause the stripper to form a low sag structure as quickly as possible after stirring. Thixotropic agents are well known in the paint industry and include, in particular, bentonites, kaolins, alginic acid and, above all, silica, for example fumed silica.
The function of the thickener is generally to increase the viscosity of the solution. Suitable thickeners are inorganic thickeners, for example polysilicic acids and clay minerals, such as zeolites and silicas.
Suitable organic modified natural substances may include carboxymethyl cellulose, cellulose ether, hydroxyethyl cellulose, hydroxypropyl cellulose methyl cellulose, ethoxyethyl cellulose and hydroxy propyl methyl cellulose. Suitable organic natural thickeners are starch, gum arabic, dextrins, gelatine and alginates.
The function of the surfactants is to improve wetting and washability. They may be anionic, cationic or nonionic. Alkylbenzenesulfonates in which the alkyl group contains 8 to 36 and more particularly 12 to 24 carbon atoms are particularly preferred.
Waxes and vegetable ester derivatives in particular are used to retard evaporation.
Organic acids and esters above all are used for activation. Examples include formic acid, acetic acid and methyl phosphoric ester.
The percentages by weight of the additives are based on the mixture of DMSO and co-solvent.
The components of the paint stripper according to the invention may readily be mixed together.
The paint stripper according to the invention has the following positive effects: - low odor, - complete solubility in water, - low evaporation rate and - above all a long and favorable effect on virtually
all paint systems and, finally, - low health risk compared to dichloromethane
based paint removers.
By virtue of its miscibility with water, the paint stripper according to the invention may readily be removed with water or with soap-containing water.
The broad application spectrum of the paint stripper according to the invention despite its small number of solvents is surprising. In a preferred embodiment, the paint stripper according to the invention contains only two solvents. Paints or varnishes based on the following organic binders may be removed with the stripper according to the invention: alkyd resin, chlorinated rubber, epoxy resin, acrylate resin, polyester, polyurethane, polyvinyl acetate, chlorinated polypropylene and cyclo rubber. The paint stripper according to the invention is particularly suitable for paints based on alkyd resin and acrylic resins.
The invention is illustrated by the following
Examples:
Three paint strippers according to the invention are prepared by mixing dimethylsulfoxide, butyl diglycol ether and a cellulose thickener at room temperature in the quantities shown in the Table. The paint strippers were applied to approximately 10-year-old alkyd resin paints. The stripping ratio was measured and recorded as detailed in Table 1.
Table 1
Composition and properties of paint strippers according to the invention
Example Composition Cellulose properties1) No. DMSO BDGE thickener Stripping W by weight e by weight % by weight ratio 1 30 68.5 1.5 192 2 50 47.5 1.5 38 3 75 23.5 1.5 16
DMSO = dimethylsulfoxide
BDGE = butyl diglycol ether 1) Stripping ratio is determined as follows by spot
testing.
Stripping ratio = Overall time taken for sample to
blister paint
Overall average time for reference
dichloromethane based paint remover
to blister paint.
The lower the stripping ratio, the faster the stripping action.
Claims (4)
1. A paint stripper based on dimethylsulfoxide (DMSO), characterized in that it contains 20 to 90 by weight of
DMSO and 10 to 80% by weight of an alkyl glycol ether or an alkyl diglycol ether containing 2 to 8 carbon atoms in the alkyl group and one hydroxyl group.
2. A paint stripper as claimed in claim 1, characterized by 55 to 85% by weight of DMSO and 15 to 50% by weight of alkyl diglycol ether containing 3 to 6 carbon atoms in the alkyl group.
3. A paint stripper as claimed in claim 1 or 3, characterized by the following additives: - 0 to 5% by weight and more particularly 0.1 to 3% by
weight of a thixotropicizing agent, - 0 to 5% by weight and more particularly 0.5 to 3.0W by weight of a thickener, more particularly of cel
lulose derivatives, such as ethoxyethyl cellulose, - 0 to 2% by weight and more particularly 0.5 to 1% by
weight of a surfactant, - 0 to 0.1 by weight of an evaporation retarder, - 0 to 0.1t by weight of a dye, - 0 to 0.5 by weight of a corrosion inhibitor and - 0 to 3% by weight of a activating acid or base, the
percentages by weight being based on the sum of DMSO
and ether.
4. The use of the paint stripper claimed in at least one of claims 1 to 3 for removing paints containing alkyd resins as binder.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9507909A GB2299812B (en) | 1995-04-13 | 1995-04-13 | A paint stripper |
PCT/EP1996/001575 WO1996032451A1 (en) | 1995-04-13 | 1996-04-11 | A paint stripper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9507909A GB2299812B (en) | 1995-04-13 | 1995-04-13 | A paint stripper |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9507909D0 GB9507909D0 (en) | 1995-05-31 |
GB2299812A true GB2299812A (en) | 1996-10-16 |
GB2299812B GB2299812B (en) | 1998-08-12 |
Family
ID=10773173
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9507909A Expired - Lifetime GB2299812B (en) | 1995-04-13 | 1995-04-13 | A paint stripper |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2299812B (en) |
WO (1) | WO1996032451A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1038928A1 (en) * | 1999-03-25 | 2000-09-27 | Elf Atochem S.A. | Stripping composition useful in the field of building industry |
FR2912151A1 (en) * | 2007-02-05 | 2008-08-08 | Arkema France | Crystallization point lowering additive for dimethyl sulfoxide, e.g. during use as paint stripper or surface cleaner, comprises diol and/or triol, especially glycerol |
DE102010007321B4 (en) * | 2010-02-08 | 2017-11-09 | Chemische Werke Kluthe Gmbh | Aqueous cleaning solution, in particular for the removal of paint deposits, and concentrate composition for providing an aqueous cleaning solution |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH670832A5 (en) * | 1987-03-19 | 1989-07-14 | Rico S A Lausanne | Paint and varnish stripping compsn. - comprising chloro-hydrocarbon free resin solubiliser, swelling agent, solvent for surfactant, surfactant, thickener and dissolving assistant |
JP2578821B2 (en) * | 1987-08-10 | 1997-02-05 | 東京応化工業株式会社 | Stripper for positive photoresist |
-
1995
- 1995-04-13 GB GB9507909A patent/GB2299812B/en not_active Expired - Lifetime
-
1996
- 1996-04-11 WO PCT/EP1996/001575 patent/WO1996032451A1/en active Application Filing
Non-Patent Citations (2)
Title |
---|
Derwent Abstract No. 89-241845/34 relating to CH-670832 (Rico), 14.7.89 * |
Derwent Abstract No. 94-098015/12 relating to JP 6049396, 22.2.94 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1038928A1 (en) * | 1999-03-25 | 2000-09-27 | Elf Atochem S.A. | Stripping composition useful in the field of building industry |
FR2791349A1 (en) * | 1999-03-25 | 2000-09-29 | Atochem Elf Sa | STRIPPING COMPOSITION, IN PARTICULAR FOR USE IN THE BUILDING FIELD |
FR2912151A1 (en) * | 2007-02-05 | 2008-08-08 | Arkema France | Crystallization point lowering additive for dimethyl sulfoxide, e.g. during use as paint stripper or surface cleaner, comprises diol and/or triol, especially glycerol |
WO2008107611A3 (en) * | 2007-02-05 | 2008-11-06 | Arkema France | Dimethylsulfoxide formulation in mixture with additive for lowering the crystallization point of same, and applications of said mixture |
US7959767B2 (en) | 2007-02-05 | 2011-06-14 | Arkema France | Dimethyl sulfoxide formulation in mixture with additive for lowering the crystallization point of same, and applications of said mixture |
US8741826B2 (en) | 2007-02-05 | 2014-06-03 | Arkema France | Dimethylsulfoxide formulation in mixture with additive for lowering the crystallization point of same, and applications of said mixture |
EP3795648A1 (en) * | 2007-02-05 | 2021-03-24 | Gaylord Chemical Company LLC | Formulation of dimethyl sulfoxide in mixture with an additive capable of reducing the crystallisation point of the latter, and uses of said mixture |
DE102010007321B4 (en) * | 2010-02-08 | 2017-11-09 | Chemische Werke Kluthe Gmbh | Aqueous cleaning solution, in particular for the removal of paint deposits, and concentrate composition for providing an aqueous cleaning solution |
Also Published As
Publication number | Publication date |
---|---|
WO1996032451A1 (en) | 1996-10-17 |
GB2299812B (en) | 1998-08-12 |
GB9507909D0 (en) | 1995-05-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PE20 | Patent expired after termination of 20 years |
Expiry date: 20150412 |