JP7746100B2 - Aqueous stripping composition - Google Patents

Description

The present invention provides an aqueous stripping composition that has a low environmental impact, has excellent stripping properties, and is non-flammable and maintains its non-flammability after application.

Methods for repainting a paint film (old paint film) formed on the surface of a building, civil engineering structure, etc. include painting a new paint over the old paint film, or stripping the old paint film and painting a new paint film. Traditionally, repainting has often been done by painting a new paint over the old paint film, due to factors such as cost and shortening construction time, and there are currently many buildings and civil engineering structures that have had two or three or more coats of paint applied over the old paint film.

However, if multiple layers of new paint are applied over an already deteriorated old paint film, the paint film itself may become heavy and put strain on the substrate. Furthermore, the paint film itself may become too thick and compress the space. Furthermore, with the emergence of high-performance paint films in recent years, it may be difficult to even apply new paint over a paint film.

Due to these problems, recently, methods of first peeling off the old paint film have become more common.
Methods for removing old paint films include physical methods such as sanding, blasting, high-pressure water spraying, and chiseling, as well as chemical methods using chemicals and solvents.However, recently, chemical methods using water-based stripping agents have come to be used due to issues such as damage to the base and dust dispersion, as well as environmental considerations and safety.

Japanese Patent Application Laid-Open No. 2020-84164 WO2018/179925

For example, Patent Documents 1 and 2 describe aqueous stripping agents whose basic composition is water and aromatic alcohol (benzyl alcohol), and state that they have a small environmental impact and stripping effect.
However, aqueous stripping agents are usually applied approximately 1 to 48 hours after application, when the old coating film is softened before the stripping operation begins. However, there is a risk of the agent catching fire some time after application, and this risk could be expected in some cases, for example, with coating films during the stripping operation or after they have been stripped.

The present invention was developed in light of these issues. The inventors discovered that by mixing a specific amount of (C) solid paraffin with (A) water and (B) aromatic alcohol, it is possible to obtain an aqueous stripping composition that has a low environmental impact, excellent stripping effectiveness, and is non-flammable and maintains its non-flammability after application, leading to the completion of the present invention.

That is, the present invention has the following features.
1. (A) water, and
(B) an aromatic alcohol,
An aqueous stripper composition comprising:
Furthermore, (C) solid paraffin 0.01% by weight or more and 10% by weight or less,
(D) an aromatic organic solvent having 6 to 15 carbon atoms, and
an aliphatic solvent having from 6 to 30 carbon atoms;
1. An aqueous stripping composition comprising:
2. (A) Water 20% by weight or more and 60% by weight or less,
(B) 40% by weight or more and 80% by weight or less of an aromatic alcohol;
(C) solid paraffin 0.01% by weight or more and 10% by weight or less,
(D) 0.1% by weight or more and 10% by weight or less of an aromatic organic solvent having 6 to 15 carbon atoms, and
0.5% by weight or more and 10% by weight or less of an aliphatic solvent having 6 to 30 carbon atoms,
1. An aqueous stripping composition comprising:
3. The aqueous stripping composition according to 1. or 2. , further comprising (E) a surfactant.
4. The aqueous stripping composition according to any one of 1. to 3. , further comprising (F) a volatilization inhibitor.

The aqueous stripping composition of the present invention has a low environmental impact, has excellent stripping properties, and is non-flammable, maintaining its non-flammability after application.

The following describes how to implement the present invention.

The aqueous stripping composition of the present invention is characterized by being composed of a mixture of (A) water (hereinafter also referred to as "component (A)"), (B) aromatic alcohol (hereinafter also referred to as "component (B)"), and (C) solid paraffin (hereinafter also referred to as "component (C)") in an amount of 0.01% by weight to 10% by weight.

Examples of the component (B) used in the present invention include benzyl alcohol, phenylethyl alcohol, naphthol, etc. In the present invention, it is particularly preferable to use benzyl alcohol.
By mixing such components (B) and (A), it is possible to obtain an aqueous stripping agent that has excellent stripping effect, is non-flammable, and has excellent durability of non-flammability after application.

The component (C) used in the present invention is solid paraffin having a melting point of 30° C. or higher and 70° C. or lower (preferably 35° C. or higher and 65° C. or lower).
By mixing such component (C) in an amount of 0.01% by weight or more and 10% by weight or less (preferably 0.03% by weight or more and 8% by weight or less, and more preferably 0.05% by weight or more and 5% by weight or less) relative to the total amount of the composition, it is possible to impart non-flammability over time after application, and to obtain excellent sustained non-flammability.

The blending amounts of the (A) component and the (B) component are preferably 20% by weight or more and 60% by weight or less (preferably 25% by weight or more and 55% by weight or less, more preferably 30% by weight or more and 50% by weight or less) of the (A) component and 40% by weight or more and 80% by weight or less (preferably 45% by weight or more and 75% by weight or less, more preferably 50% by weight or more and 70% by weight or less) of the (B) component, relative to the total amount of the composition.
By using the composition in this range, it is possible to obtain a release agent that has a small environmental impact, is excellent in release effect, and is non-flammable.

In addition to the above components (A), (B), and (C), the aqueous stripping agent of the present invention may contain (D) an aromatic solvent (hereinafter also referred to as "component (D)"), (E) a surfactant (hereinafter also referred to as "component (E)"), and (F) a volatilization inhibitor (hereinafter also referred to as "component (F)").

Examples of component (D) used in the present invention include toluene, xylene, benzene, ethylbenzene, ethyltoluene, cumene, cymene, trimethylbenzene, naphthalene, chlorobenzene, dichlorobenzene, benzyl phenyl ether, benzyl methyl ether, methyl phenyl ether, ethyl phenyl ether, propyl phenyl ether, butyl phenyl ether, 1,2-methylenedioxybenzene, 1,2-ethylenedioxybenzene, dibenzyl ether, and diphenyl ether, and one or more of these can be used. In the present invention, it is preferable to use an aromatic solvent (preferably an aromatic hydrocarbon solvent) having 6 to 15 carbon atoms (preferably 7 to 12 carbon atoms), particularly one or more selected from toluene, xylene, benzene, ethylbenzene, ethyltoluene, cumene, cymene, and trimethylbenzene. Note that, from the viewpoints of reducing environmental impact and odor, it is preferable that chlorinated aromatic solvents such as chlorobenzene and dichlorobenzene are not included, or that their content is 10 wt. % or less, based on the total amount of component (D). Furthermore, from the viewpoints of reducing the environmental load and reducing odor, aromatic ether solvents such as benzyl phenyl ether, benzyl methyl ether, methyl phenyl ether, ethyl phenyl ether, propyl phenyl ether, butyl phenyl ether, 1,2-methylenedioxybenzene, 1,2-ethylenedioxybenzene, dibenzyl ether, and diphenyl ether are preferably not contained, or their content is preferably 90% by weight or less (more preferably 50% by weight or less, and even more preferably 10% by weight or less) of the total amount of component (D).
Component (D) is a component that can be expected to particularly improve the release effect. Component (D) is also highly compatible with components (B) and (C), and the synergistic effects of components (B) and (C) with component (D) can provide even better release effect and sustained non-flammability.
The amount of component (D) to be blended is not particularly limited, but is preferably 0.1% by weight or more and 10% by weight or less (preferably 0.3% by weight or more and 8% by weight or less, and more preferably 0.5% by weight or more and 5% by weight or less) of the total amount of the composition.

The component (E) used in the present invention is not particularly limited to anionic surfactants, cationic surfactants, nonionic surfactants, etc. In the present invention, examples thereof include polyoxyalkylene alkyl ethers having an alkyl group and an oxyalkylene unit, or their sulfates, sulfate ester salts, sulfonates, sulfonate ester salts, succinate salts, succinate ester salts, etc., and it is preferable to use one or more of these.
Specific examples of polyoxyalkylene alkyl ethers include polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene distearate, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene alkyl ether, polyoxyethylene phenyl ether, polyoxyethylene tridecyl ether, polyoxyethylene decyl ether, polyoxyethylene octyldodecyl ether, etc. Examples of oxyalkylene units include oxyethylene units and oxypropylene units, and the number of repeating units is preferably 6 to 50, and more preferably 8 to 30. The alkyl group preferably has 6 to 30 carbon atoms (preferably 8 to 24 carbon atoms).
Component (E) forms an emulsified dispersion of components (A) and (B) and can enhance dispersion stability. Furthermore, by mixing it with component (D), a release agent with excellent release effect and durability of the release effect can be obtained.
The amount of component (E) to be blended is not particularly limited, but is preferably 0.1% by weight or more and 10% by weight or less (preferably 0.5% by weight or more and 8% by weight or less, and more preferably 1.0% by weight or more and 6% by weight or less) relative to the total amount of the composition.

Examples of the component (F) used in the present invention include trihydric alcohols such as glycerin, butanetriol, 2-methyl-propanetriol, pentanetriol, 2-methyl-butanetriol, trimethylolethane, hexanetriol, 2-ethyl-butanetriol, and trimethylolpropane; tetrahydric alcohols such as pentaerythritol, pentanetetrol, hexanetetrol, diglycerin, and ditrimethylolpropane; pentahydric alcohols such as adonitol, arabitol, xylitol, and triglycerin; hexahydric alcohols such as dipentaerythritol, sorbitol, mannitol, iditol, inositol, dulcitol, talose, and allose;
Examples of the alcohol include octahydric alcohols such as tripentaerythritol, amines such as triethanolamine and triisopropanolamine, benzenetricarboxylic acids such as trimellitic acid and hemimellitic acid, benzenetetracarboxylic acids such as pyromellitic acid, benzenehexacarboxylic acids such as mellitic acid, cyclohexanetricarboxylic acid, triaminotriethylamine, triethylenetetramine, and hexamethylphosphoric triamide, and one or more of these may be used. In the present invention, it is particularly preferred to use one or more trihydric alcohols, and it is further preferred to use glycerin.
Such component (F) prevents the evaporation of components (A) and (B), and can enhance the durability of the release effect and the durability of non-flammability after application.
The amount of component (F) to be blended is not particularly limited, but is preferably 0.1% by weight or more and 20% by weight or less (preferably 0.5% by weight or more and 18% by weight or less, and more preferably 1% by weight or more and 15% by weight or less) relative to the total amount of the composition.

In addition to the above components, the aqueous stripping agent of the present invention may also contain, for example, aliphatic solvents, thickeners, oxidizing agents, reducing agents, resins, waxes, fragrances, colorants, dyes, etc.

As the aliphatic solvent, for example, an aliphatic solvent having 6 to 30 carbon atoms (preferably 8 to 24 carbon atoms, more preferably 10 to 22 carbon atoms, and even more preferably 12 to 20 carbon atoms) can be used, and this component is expected to improve the durability of the stripping effect.
Examples of the aliphatic solvent include the following, and one or more of these can be used as needed.
- Linear or branched, saturated or unsaturated aliphatic hydrocarbons having from 6 to 30 carbon atoms. Examples include hexane, octane, nonane, decane, undecane, dodecane, tridecane, pentadecane, tetradecane, hexadecane, heptadecane, octadecane, nonadecane, eicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane, nonacosane, and triacontane.
- Linear or branched, saturated or unsaturated aliphatic monoalcohols having from 6 to 30 carbon atoms, including but not limited to primary, secondary, and tertiary alcohols, such as hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosanol, heneicosanol, docosanol, tricosanol, tetracosanol, pentacosanol, hexacosanol, heptacosanol, octacosanol, nonacosanol, triacontanol, oleyl alcohol, linoleyl alcohol, and palmitoleyl alcohol. , elaidyl alcohol, elaidilinoleyl alcohol, linolenyl alcohol, elaidilinolenyl alcohol, erucyl alcohol, isohexanol, 2-methyl-1-pentanol, 3-methyl-1-pentanol, 2-ethyl-1-butanol, 3,3-dimethyl-1-butanol, isoheptanol, 4-methyl-1-hexanol, 3-methyl-1-hexanol, 2-ethyl-2-methyl-1-butanol, isooctanol, 2-ethylhexanol, 6-methyl-2-heptanol, isononanol, 3,5,5-trimethylhexanol, isodecanol, isoundecanol, isododecanol, 2-butyloctanol ethanol, isotridecanol, isotetradecanol, isopentadecanol, 2-hexyldecanol, isohexadecanol, 2-hexyldecanol, isoheptadecanol, isooctadecanol, 2-isoheptylisoundecanol, isononadecanol, isoeicosanol, 2-octyldodecanol, isoheneicosanol, 18-methyleicosanol, isodocosanol, isotricosanol, isotetracosanol, 2-decyltetradecanol, isopentacosanol, isohexacosanol, isoheptacosanol, isooctacosanol, isononacosanol, and isotriacontanol.
- Linear or branched saturated or unsaturated aliphatic dialcohols having from 6 to 30 carbon atoms. Examples include hexanediol, heptanediol, octanediol, nonanediol, decanediol, undecanediol, dodecanediol, tridecanediol, tetradecanediol, pentadecanediol, hexadecanediol, heptadecanediol, octadecanediol, nonadecanediol, eicosanediol, heneicosanediol, docosanediol, tricosanediol, tetracosanediol, pentacosanediol, hexacosanediol, heptacosanediol, octacosanediol, nonacosanediol, triacosanediol, and ricinoleyl alcohol.
- Linear or branched saturated or unsaturated aliphatic monocarboxylic acids having 6 to 30 carbon atoms, for example, hexanoic acid, heptanoic acid, octanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, and heptadecanoic acid , Octadecanoic acid, Nonadecanoic acid, Eicosanoic acid, Heneicosanoic acid, Docosanoic acid, Tricosanoic acid, Tetracosanoic acid, Pentacosanoic acid, Hexacosanoic acid, Heptacosanoic acid, Octacosanoic acid, Nonacosanoic acid, Triacontanoic acid, Sapienic acid, Oleic acid, Eicosanoic acid, Erucic acid, Nervonic acid, Palmitoleic acid, Vaccenic acid, Paulic acid, Mead acid, Linoleic acid, γ-linolenic acid, Pinolenic acid, Eicosadienoic acid, Dihomo-γ-linolenic acid, Arachidonic acid, Docosadienoic acid, Docosatetraenoic acid, Adrenic acid, Docosapentaenoic acid, Osbondoic acid, α-linolenic acid, Stearidonic acid, Eicosatrienoic acid , eicosatetraenoic acid, eicosapentaenoic acid, docosapentaenoic acid, docosahexaenoic acid, tetracosapentaenoic acid, tetracosahexaenoic acid, ricinoleic acid, myristoleic acid, pentadecenoic acid, heptadecenoic acid, petroselinic acid, eleostearic acid, bosseopentaenoic acid, gadoleic acid, ethylhexanoic acid, neodecanoic acid, isotridecanoic acid, isotetradecanoic acid, isopentadecanoic acid, isohexadecanoic acid, 2-hexyldecanoic acid, isoheptadecanoic acid, isooctadecanoic acid, isononadecanoic acid, isoeicosanoic acid, 2-octyldodecanoic acid, 2-decyltetradecanoic acid, and the like.
Linear or branched saturated or unsaturated aliphatic dicarboxylic acids having from 6 to 30 carbon atoms. Examples include hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid, and decanedioic acid.
Linear or branched saturated or unsaturated aliphatic monoesters having from 6 to 30 carbon atoms. Examples include aliphatic monoesters which are reaction products of the above-mentioned aliphatic monocarboxylic acids having from 6 to 30 carbon atoms and alcohols, and aliphatic monoesters which are reaction products of the above-mentioned aliphatic monoalcohols having from 6 to 30 carbon atoms and carboxylic acids.
Linear or branched saturated or unsaturated aliphatic diesters having from 6 to 30 carbon atoms. Examples include aliphatic diesters which are reaction products of the above-mentioned aliphatic dicarboxylic acids having from 6 to 30 carbon atoms and alcohols, and aliphatic diesters which are reaction products of the above-mentioned aliphatic dialcohols having from 6 to 30 carbon atoms and carboxylic acids.
The alcohol used in producing the aliphatic monoester or aliphatic diester may be one or more selected from the aliphatic monoalcohols described above, or methanol, ethanol, propanol, butanol, and pentanol, while the carboxylic acid may be one or more selected from the aliphatic monocarboxylic acids described above, or methanoic acid, ethanoic acid, propanoic acid, butanoic acid, and pentanoic acid.
Linear or branched saturated or unsaturated aliphatic ethers having from 6 to 30 carbon atoms. Examples include heptyl ether, octyl ether, tetradecyl ether, and hexadecyl ether.
Linear or branched saturated or unsaturated aliphatic ketones having from 6 to 30 carbon atoms. Examples include methyl isobutyl ketone, diisobutyl ketone, heptanone, cyclohexanone, cycloheptanone, cyclooctanone, and isophorone.
- Linear or branched, saturated or unsaturated aliphatic monoamines having from 6 to 30 carbon atoms. Examples include hexylamine, heptylamine, octylamine, ethylhexylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, octadecylamine, eicosylamine, docosylamine, tetracosylamine, pentacosylamine, hexacosylamine, heptacosylamine, octacosylamine, nonacosylamine, triacontylamine, oleylamine, linoleylamine, erucamine, and ricinoleylamine.
Linear or branched saturated or unsaturated aliphatic diamines having from 6 to 30 carbon atoms. Examples include hexyldiamine, heptyldiamine, octanediamine, decanediamine, and dodecanediamine.
Linear or branched saturated or unsaturated aliphatic monoamides having from 6 to 30 carbon atoms. Examples include hexanamide, heptanamide, octanamide, decanamide, dodecaneamide, tetradecanamide, hexadecanamide, octadecanamide, eicosanamide, docosanamide, tetracosanamide, oleic acid amide, linoleic acid amide, linolenic acid amide, arachidonic acid amide, erucic acid amide, and the like, as well as aliphatic monoamides which are reaction products of the above-mentioned aliphatic monocarboxylic acids having from 6 to 30 carbon atoms with amines.
Linear or branched saturated or unsaturated aliphatic diamides having 6 to 30 carbon atoms. Examples include aliphatic diamides which are reaction products of the above-mentioned aliphatic dicarboxylic acids having 6 to 30 carbon atoms and amines.
The amine used in producing the aliphatic monoamide or aliphatic diamide may be, for example, one or more selected from the above-mentioned aliphatic monoamines, methylamine, ethylamine, propylamine, butylamine, and pentylamine.

In the present invention, as the aliphatic solvent, a combination of an aliphatic solvent having 6 to 12 carbon atoms (preferably 8 to 12 carbon atoms) and an aliphatic solvent having 13 to 30 carbon atoms (preferably 14 to 24 carbon atoms) can be particularly used.
As the aliphatic solvent, it is preferable to use one or more selected from aliphatic hydrocarbons, aliphatic monoalcohols, aliphatic monoesters, aliphatic diesters, aliphatic monoamides, and aliphatic diamides, and in particular, a combination of an aliphatic hydrocarbon with an aliphatic monoester and/or an aliphatic diester can be used.
The amount of the aliphatic solvent to be blended is not particularly limited, but is preferably 10% by weight or less (more preferably 8% by weight or less) of the total amount of the composition, and when an aliphatic solvent is blended, it is preferably 0.5% by weight or more.

Examples of thickeners that can be used include clay minerals such as sepiolite, palygorskite, bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volconescoite, sauconite, stevensite, fluorohectorite, laponite, rectonite, vermiculite, illite, makatite, kanemite, illielite, magadiite, and Kenyaite; swelling silica; cellulose or a cellulose derivative; and polyacrylic acid polymers.
The amount of thickener to be added is not particularly limited, but is preferably 0.1% by weight to 20% by weight, more preferably 0.5% by weight to 15% by weight, based on the total amount of the composition.

Examples of oxidizing agents include formic acid, acetic acid, butyric acid, acrylic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, phthalic acid, maleic acid, fumaric acid, benzoic acid, salicylic acid, cinnamic acid, lactic acid, malic acid, citric acid, tartaric acid, ascorbic acid, aspartic acid, aminobenzoic acid, alginic acid, glycolic acid, gluconic acid, glutamic acid, toluenesulfonic acid, nicotinic acid, uric acid, halogen-substituted acetic acid, benzenesulfonic acid, hydrogen peroxide, perchlorates, and perborates.

Examples of reducing agents include sodium hydroxide, sodium polyphosphate, sodium carbonate, potassium hydroxide, lithium hydroxide, calcium hydroxide, etc.

There are no particular restrictions on the amount of oxidizing agent and reducing agent mixed in, but it is preferable that their total amount be 10% by weight or less, and even more preferably 0% by weight or more and 5% by weight or less, of the total amount of the composition.

Examples of resins include vinyl acetate resin, acrylic resin, urethane resin, and polyester resin. The resin form is not particularly limited and may be water-soluble, water-dispersible, solvent-soluble, NAD, self-emulsifying, or powder.

Examples of waxes include polyethylene wax and its derivatives, montan wax and its derivatives, microcrystalline wax and its derivatives, petrolatum, carnauba wax, candelilla wax, rice wax, Japan wax, lanolin, beeswax, and Fischer-Tropsch wax. They may be liquid or solid, and one or more types may be used. Liquid paraffin wax and its derivatives may also be used.

Further, examples of the solvent other than the component (D) and the aliphatic solvent include ethylene glycol, diethylene glycol, propylene glycol, ethylene glycol mono-n-butyl ether, ethylene glycol mono-tert-butyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, ethylene glycol diacetate, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, propylene glycol mono-n-butyl ether, dipropylene glycol monopropyl ether, ethylene glycol mono-2-ethylhexyl ether, ethylene glycol dibutyl ether, diethylene glycol ethyl methyl ether, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol Glycols such as ethylene glycol diethyl ether, diethylene glycol dibutyl ether, dipropylene glycol dimethyl ether, triethylene glycol dimethyl ether, diethylene glycol monoethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, and diethylene glycol monobutyl ether acetate, as well as ethyl acetate, butyl acetate, dimethyl sulfoxide, hexamethylphosphoric triamide, N-methylpyrrolidone, sulfolane, chlorobutane, bromohexane, dichloromethane, 1,2-dichloroethane, 1,1-dichloroethane, chloroform, chlorinated polyethylene, chlorinated polypropylene, triglycerides, cyclohexanol, and furfuryl alcohol can also be used.
In the present invention, it is preferable not to use chlorinated solvents such as chlorobutane, bromohexane, dichloromethane, 1,2-dichloroethane, 1,1-dichloroethane, chloroform, chlorinated polyethylene, and chlorinated polypropylene from the viewpoint of odor, etc.

The stripper composition of the present invention can be obtained by mixing the above components. Furthermore, from the viewpoints of reducing the environmental load, safety, workability, etc., the pH of the stripper composition of the present invention is preferably from 3 to 14, more preferably from 3.5 to 8, and even more preferably from 4 to 7.

The stripping agent composition of the present invention is used to remove coating films formed on the surfaces of buildings, civil engineering structures, etc., and applicable coating films include, but are not limited to, JIS K5621 "General-purpose rust-preventive paint," JIS K5651 "Amino alkyd resin paint," JIS K5658 "Weather-resistant topcoat paint for architecture," JIS K5659 "Weather-resistant paint for steel structures," JIS K5660 "Glossy synthetic resin emulsion paint," JIS K5663 "Synthetic resin emulsion paint," JIS K5668 "Synthetic resin emulsion pattern paint," JIS K5670 "Acrylic resin-based non-aqueous dispersion paint," and JIS A6909 "Architectural finish coating material."

The release agent composition of the present invention may be applied to such a coating film at a rate of preferably 0.2 kg/m2 or more and 5.0 kg/m2 or less, more preferably 0.3 kg/m2 or more and 3.0 kg/m2 or less. There are no particular limitations on the application tool, and application may be performed using, for example, a roller, brush, trowel, spatula, spray gun, or the like.

The stripping composition of the present invention softens and begins to strip within 30 minutes to 2 hours, and remains softened even after 24 to 48 hours. This allows stripping to be performed at the applicator's convenience, such as the next day. There are no particular limitations on the stripping tool used; for example, a trowel, spatula, scraper, etc. can be used. The present invention exhibits excellent long-lasting non-flammability after application, allowing for safe stripping.

The following examples will further clarify the features of this invention.

Remover compositions 1 to 16 were prepared by uniformly mixing the following raw materials in the weight proportions shown in Table 1. The pH of each of the remover compositions 1 to 16 was within the range of 4 to 6.
A: Water B: Benzyl alcohol C: Solid paraffin (melting point 60°C)
D1: Trimethylbenzene
D2: Methyl phenyl ether E: Polyoxyethylene (20) lauryl ether Sodium sulfate F: Glycerin Solvent: Nonane Liquid paraffin Thickener: Cellulose-based thickener

(Test 1) Non-flammability 1 kg of the obtained stripping agent composition was placed in a metal container (5 liters), the container was sealed with a lid, and the container was left to stand for 1 hour.
After leaving it to stand, the lid was opened and the stripper composition was ignited near the surface using an ignition rod, and the state of the stripper composition was observed. The evaluation results are shown in Table 1.
4: When ignited, it did not catch fire.
3: After ignition, some ignition was observed, but the fire was extinguished within 1 second.
2: After ignition, some ignition was observed, but the fire was extinguished within 5 seconds.
1: After ignition, ignition was observed and continued for 5 seconds or more.

(Test 2) Peelability The coating surface shown below was placed vertically, and the peeling composition shown in Table 1 was applied with a roller in the required amount shown below, and the following test was carried out.
Coating surface: One side of a slate board (300 x 150 x 6 mm) was sprayed with an acrylic silicone resin paint mainly composed of acrylic silicone resin and titanium oxide to form a coating film with a thickness of 0.3 mm, which was then exposed to an accelerated weather resistance tester "Eye Super UV Tester" (manufactured by Iwasaki Electric Co., Ltd.) for 400 hours to obtain the coating surface. The required amount of the stripping composition was 0.5 kg/m2.
24 hours after application, the coating was peeled off using a spatula, and the degree of peeling was evaluated on a 5-point scale from "5" (peelable smoothly without any problems, showing excellent coating film softening properties) to "1" (peel was difficult, showing poor coating film softening properties). The results are shown in Table 1.

(Test 3) Duration of non-flammability 1 kg of the coating film peeled off in Test 2 was placed in a metal container (5 liters), and ignited near the surface of the coating film using an ignition rod, and the state of the coating film was observed. The evaluation was as follows. The evaluation results are shown in Table 1.
4: When ignited, it did not catch fire.
3: After ignition, some ignition was observed, but the fire was extinguished within 1 second.
2: After ignition, some ignition was observed, but the fire was extinguished within 5 seconds.
1: After ignition, ignition was observed and continued for 5 seconds or more.

Claims (4)

(A) water, and
(B) an aromatic alcohol,
An aqueous stripper composition comprising:
Furthermore, (C) solid paraffin 0.01% by weight or more and 10% by weight or less,
(D) an aromatic organic solvent having 6 to 15 carbon atoms, and
an aliphatic solvent having from 6 to 30 carbon atoms;
1. An aqueous stripping composition comprising: (A) Water 20% by weight or more and 60% by weight or less,
(B) 40% by weight or more and 80% by weight or less of an aromatic alcohol;
(C) solid paraffin 0.01% by weight or more and 10% by weight or less,
(D) 0.1% by weight or more and 10% by weight or less of an aromatic organic solvent having 6 to 15 carbon atoms, and
0.5% by weight or more and 10% by weight or less of an aliphatic solvent having 6 to 30 carbon atoms,
1. An aqueous stripping composition comprising: 3. The aqueous stripping composition according to claim 1, further comprising (E) a surfactant. 4. The aqueous stripping composition according to claim 1, further comprising (F) a volatilization inhibitor.