Remover composition

Abstract

To provide a remover composition that has small environmental load and has a long-lasting removal effect.SOLUTION: A remover composition has (A) a monoester of a C6-12 fatty acid and (B) a monoester of a C13-30 fatty acid.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a stripping agent composition that has a small environmental impact, an excellent stripping effect, and an excellent durability of the stripping effect. [Background technology]

[0002] 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 peeling off the old paint film and painting a new paint film. Conventionally, repainting has often been done by painting a new paint over the old paint film in terms of 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.

[0003] However, if new paint is applied multiple times on top of an already deteriorated old paint film, the paint film itself may become heavy and put a strain on the substrate. The paint film itself may also become too thick and compress the space. Furthermore, with the emergence of high-performance paint films in recent years, it may be difficult to apply new paint on top of a paint film.

[0004] 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 environmentally friendly stripping agents have come to be used in order to prevent problems such as damage to the base and dust scattering, as well as from the perspective of environmental considerations (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-131651 [Patent Document 2] Japanese Patent Application Publication No. 2018-70725 Summary of the Invention [Problem to be solved by the invention]

[0006] As the main components of such release agents, components such as benzyl alcohol and dibasic acid esters are used (for example, Patent Documents 1 and 2). [Means for solving the problem]

[0007] The present invention aims to provide a more environmentally friendly release agent, and by combining (A) a monoester of a fatty acid having from 6 to 12 carbon atoms and (B) a monoester of a fatty acid having from 13 to 30 carbon atoms, the inventors have succeeded in developing a release agent composition that has a low environmental impact, excellent release effect, and excellent durability of the release effect, leading to the completion of the present invention.

[0008] That is, the present invention has the following features. 1. (A) Monoesters of fatty acids having 6 to 12 carbon atoms, and (B) a monoester of a fatty acid having 13 to 30 carbon atoms; Including fruit, The composition further comprises a thickener, which is at least one selected from the group consisting of clay minerals such as sepiolite, palygorskite, bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volkonscoite, sauconite, stevensite, fluorohectorite, laponite, rectonite, vermiculite, illite, makatite, kanemite, irielite, magadiite, and kenyaite, swelling silica, cellulose or a cellulose derivative, and polyacrylic acid polymer. Stripping composition. 2. The stripping composition according to 1., characterized in that it contains 10 parts by weight or more and 500 parts by weight or less of the (B) component per 100 parts by weight of the (A) component. 3. The stripping composition according to 1., further comprising a solvent, the solvent being at least one selected from the group consisting of dibasic acid esters, aromatic alcohols, and N-methylpyrrolidone. [Effects of the Invention]

[0009] The stripping composition of the present invention has a small environmental impact, is excellent in stripping effect, and has excellent durability of the stripping effect. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described.

[0011] The release agent composition of the present invention is characterized by containing (A) a monoester of a fatty acid having from 6 to 12 carbon atoms (hereinafter also referred to as "component (A)") and (B) a monoester of a fatty acid having from 13 to 30 carbon atoms (hereinafter also referred to as "component (B)").

[0012] Component (A) is a monoester of a fatty acid having one ester group, obtained by reacting a fatty acid having 6 to 12 carbon atoms with an alcohol. Component (A) has excellent coating film stripping properties. Component (A) is also safe, has a low environmental impact, and exhibits excellent stripping properties.

[0013] The fatty acid having 6 to 12 carbon atoms used in component (A) is not particularly limited, and may be, for example, linear, branched, cyclic, saturated, unsaturated, etc. However, it is preferable to use one or more fatty acids selected from linear saturated fatty acids and branched saturated fatty acids as the fatty acid having 6 to 12 carbon atoms used in component (A) of the present invention. Examples of linear saturated fatty acids include hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, and dodecanoic acid, and one or more of these can be used. Examples of branched saturated fatty acids include isohexanoic acid, 2-ethylbutyric acid, isoheptanoic acid, isooctanoic acid, 2-ethylhexanoic acid, isononanoic acid, neodecanoic acid (such as versatic acid and isodecanoic acid), dimethyloctanoic acid, isoundecanoic acid, isododecanoic acid, neododecanoic acid, and 2-butyloctanoic acid, and one or more of these may be used. In the present invention, it is particularly preferable to use a straight-chain saturated fatty acid, and it is more preferable to use a straight-chain saturated fatty acid having 7 to 11 carbon atoms.

[0014] The alcohol used in component (A) is not particularly limited, and may be, for example, primary, secondary, tertiary, etc., linear, branched, cyclic, etc., saturated, unsaturated, etc. However, it is preferable to use one or more alcohols selected from linear saturated primary alcohols, linear unsaturated primary alcohols, and branched saturated primary alcohols as the alcohol used in component (A) of the present invention. Examples of linear saturated primary alcohols include methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 1-nonadecanol, 1-eicosanol, 1-heneicosanol, 1-docosanol, 1-tricosanol, 1-tetracosanol, 1-pentacosanol, 1-hexacosanol, 1-heptacosanol, 1-octacosanol, 1-nonacosanol, and 1-triacontanol, and one or more of these may be used. Examples of linear unsaturated primary alcohols include oleyl alcohol, linoleyl alcohol, palmitoleyl alcohol, elaidyl alcohol, elaidolinoleyl alcohol, linolenyl alcohol, elaidolinolenyl alcohol, and erucyl alcohol, and one or more of these can be used. Examples of branched saturated primary alcohols include isopropanol, isobutanol, isopentanol, 2-methyl-1-butanol, 2,2-dimethyl-1-propanol, 3-methyl-1-butanol, 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-butylhexan ... Examples of the isoctanol include ethyloctanol, 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, and one or more of these may be used. In the present invention, it is particularly preferable to use a linear saturated primary alcohol, and more preferably to use a linear saturated primary alcohol having 1 to 12 carbon atoms (preferably 1 to 6 carbon atoms).

[0015] Component (B) is a monoester of a fatty acid having one ester group, obtained by reacting a fatty acid having 13 to 30 carbon atoms with an alcohol. Component (B) inhibits the evaporation of component (A) and maintains the exfoliating effect of component (A). Component (B) is also safe and has a low environmental impact.

[0016] The fatty acid having 13 to 30 carbon atoms used in component (B) is not particularly limited, and may be, for example, linear, branched, cyclic, saturated, unsaturated, etc. However, it is preferable to use one or more fatty acids selected from linear saturated fatty acids, linear unsaturated fatty acids, and branched saturated fatty acids as the fatty acid having 13 to 30 carbon atoms used in component (B) of the present invention. Examples of linear saturated fatty acids include tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic acid, icosanoic acid, henicosanoic acid, docosanoic acid, tricosanoic acid, tetracosanoic acid, pentacosanoic acid, hexacosanoic acid, heptacosanoic acid, octacosanoic acid, nonacosanoic acid, and triacontanoic acid, and one or more of these may be used. Examples of linear unsaturated fatty acids include sapienic acid, oleic acid, eicosenoic 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, and stearic acid. Examples of such an acid include ricinoleic 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, and gadoleic acid, and one or more of these may be used. Examples of branched saturated fatty acids include 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 2-dodecylhexadecanoic acid, and one or more of these may be used. In the present invention, it is particularly preferable to use one or more fatty acids selected from linear saturated fatty acids and linear unsaturated fatty acids, and it is even more preferable to use one or more fatty acids selected from linear saturated fatty acids and linear unsaturated fatty acids having 14 to 24 carbon atoms.

[0017] The alcohol used in component (B) may be one or more selected from the alcohols used in component (A) above. As the alcohol used in component (B), it is particularly preferable to use a linear saturated primary alcohol, and it is even more preferable to use a linear saturated primary alcohol having 1 to 30 carbon atoms (preferably 1 to 24 carbon atoms).

[0018] The present invention has discovered a release agent that, by mixing component (A) and component (B), provides excellent release effect and also has excellent durability of the release effect. The mixing ratio of the (A) component and the (B) component is not particularly limited, but it is preferable that the (B) component be 10 parts by weight or more and 500 parts by weight or less (even more preferably 30 parts by weight or more and 300 parts by weight or less) per 100 parts by weight of the (A) component. The total content of the components (A) and (B) in the release agent is not particularly limited, but is preferably 10% by weight or more (and even more preferably 15% by weight or more and 100% by weight or less).

[0019] The release agent of the present invention may be used by mixing with other components such as commonly used solvents, thickeners, oxidizing agents, reducing agents, waxes, volatilization inhibitors, resins, surfactants, fragrances, colorants, and dyes.

[0020] Examples of the solvent include monoesters other than the component (A) and the component (B), the linear saturated fatty acids, the linear unsaturated fatty acids, the branched saturated fatty acids, the linear saturated primary alcohols, the branched saturated primary alcohols, dibasic acid esters, aliphatic dicarboxylic acids, aromatic alcohols, aliphatic dialcohols, aromatic hydrocarbons, aliphatic hydrocarbons, aliphatic ethers, aliphatic ketones, aliphatic amines, aliphatic amides, and glycols. Examples of monoesters other than the above component (A) and component (B) include methyl propionate, ethyl propionate, propyl propionate, butyl propionate, hexyl propionate, 2-ethylhexyl propionate, methyl butanoate, ethyl butanoate, propyl butanoate, butyl butanoate, hexyl butanoate, 2-ethylhexyl butanoate, methyl isobutanoate, ethyl isobutanoate, propyl isobutanoate, butyl isobutanoate, hexyl isobutanoate, 2-ethylhexyl isobutanoate, methyl pentanoate, ethyl pentanoate, propyl pentanoate, butyl pentanoate, hexyl pentanoate, 2-ethylhexyl pentanoate, methyl isopentanoate, ethyl isopentanoate, propyl isopentanoate, butyl isopentanoate, hexyl isopentanoate, and 2-ethylhexyl isopentanoate. Examples of dibasic acid esters include dimethyl succinate, dimethyl glutarate, dimethyl adipate, dimethyl phthalate, diethyl succinate, diethyl glutarate, diethyl adipate, diethyl phthalate, dibutyl succinate, dibutyl glutarate, dibutyl adipate, and dibutyl phthalate. Examples of aliphatic dicarboxylic acids include hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid, and decanedioic acid. Examples of aromatic alcohols include benzyl alcohol, phenylethyl alcohol, naphthol, and phenol. Examples of aliphatic dialcohols include hexanediol, heptanediol, octanediol, nonanediol, decanediol, undecanediol, dodecanediol, tridecanediol, tetradecanediol, pentadecanediol, hexadecanediol, heptadecanediol, octadecanediol, nonadecanediol, eicosanediol, heneicosanediol, docosanediol, tricosanediol, tetracosanediol, and ricinoleyl alcohol. Examples of aromatic hydrocarbons include toluene, xylene, benzene, ethylbenzene, cumene, trimethylbenzene, naphthalene, chlorobenzene, dichlorobenzene, benzyl phenyl ether, benzyl methyl ether, dibenzyl ether, and diphenyl ether. Examples of aliphatic hydrocarbons include hexane, octane, nonane, decane, undecane, dodecane, tridecane, pentadecane, tetradecane, hexadecane, heptadecane, octadecane, nonadecane, eicosane, and docosane. Examples of aliphatic ethers include heptyl ether, octyl ether, tetradecyl ether, and hexadecyl ether. Examples of aliphatic ketones include methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, heptanone, cyclopentanone, cyclohexanone, cycloheptanone, cyclooctanone, and isophorone. Examples of aliphatic amines include hexylamine, heptylamine, octylamine, ethylhexylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, octadecylamine, icosylamine, docosylamine, tetracosylamine, oleylamine, linoleylamine, erucamine, ricinoleylamine, hexyldiamine, heptyldiamine, octanediamine, decanediamine, and dodecanediamine; Examples of aliphatic amides 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, N,N-dimethylformamide, N,N-diethylformamide, N,N-dimethylacetamide, and 1-3-dimethyl-2-imidazolidinone; Examples of glycols 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 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; Among these, one or more kinds can be used. Other solvents that can be used include ethyl acetate, butyl acetate, dimethyl sulfoxide, hexamethylphosphoric triamide, N-methylpyrrolidone, sulfolane, water, chlorobutane, bromohexane, dichloromethane, 1,2-dichloroethane, 1,1-dichloroethane, chloroform, chlorobenzene, dichlorobenzene, chlorinated polyethylene, chlorinated polypropylene, triglyceride, cyclohexanol, and furfuryl alcohol.

[0021] In the present invention, the peeling effect can be further enhanced by including, as the solvent, at least one selected from dibasic acid esters, aromatic alcohols, and N-methylpyrrolidone. When a solvent is contained, the content of the solvent in the release agent is not particularly limited, but is preferably 10% by weight or more (and more preferably 15% by weight or more and 90% by weight or less).

[0022] 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.

[0023] Examples of oxidizing agents include formic acid, acetic acid, butyric acid, acrylic acid, linoleic acid, oleic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, sebacic 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.

[0024] Examples of reducing agents include sodium hydroxide, sodium polyphosphate, sodium carbonate, potassium hydroxide, lithium hydroxide, and calcium hydroxide.

[0025] Examples of waxes include polyethylene wax and its derivatives, montan wax and its derivatives, paraffin wax and its derivatives, microcrystalline wax and its derivatives, petrolatum, carnauba wax, candelilla wax, rice wax, Japan wax, lanolin, beeswax, Fischer-Tropsch wax, etc., and one or more of these may be used. In the present invention, it is particularly preferred to use polyethylene wax and paraffin wax.

[0026] Examples of the volatilization inhibitor include glycerin, butanetriol, 2-methyl-propanetriol, pentanetriol, 2-methyl-butanetriol, trimethylolethane, hexanetriol, 2-ethyl-butanetriol, trimethylolpropane, triethanolamine, triisopropanolamine, pentaerythritol, pentane tetrol, hexane tetrol, diglycerin, ditrimethylolpropane, sorbitol, adonitol, arabitol, xylitol, triglycerin, dipentaerythritol, sorbitol, mannitol, iditol, inositol, dulcitol, talose, allose, tripentaerythritol, trimellitic acid, benzenetricarboxylic acids such as hemimellitic acid, benzenetetracarboxylic acids such as pyromellitic acid, benzenehexacarboxylic acids such as mellitic acid, cyclohexanetricarboxylic acid, triaminotriethylamine, triethylenetetramine, hexamethylphosphoric acid triamide, and the like. One or more of these can be used.

[0027] Examples of resins include vinyl acetate resin, acrylic resin, urethane resin, polyester resin, etc., and in the present invention, it is particularly preferable to use thermoplastic resins such as vinyl acetate resin, acrylic resin, etc. Furthermore, the form of the resin is not particularly limited, and may be water-soluble, water-dispersible, solvent-soluble, NAD type, self-emulsifying type, powder type, etc., but is preferably water-dispersible, self-emulsifying type, powder type, etc.

[0028] The surfactant may be a nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, or the like, without any particular limitation.

[0029] The stripping agent composition of the present invention is used to strip coating films formed on the surfaces of buildings, civil engineering structures, etc., and applicable coating films are not particularly limited, but examples thereof include JIS K5621 "General-purpose rust-preventive paints," JIS K5651 "Amino alkyd resin paints," JIS K5658 "Weather-resistant topcoat paints for architecture," JIS K5659 "Weather-resistant paints for steel structures," JIS K5660 "Glossy synthetic resin emulsion paints," JIS K5663 "Synthetic resin emulsion paints," JIS K5668 "Synthetic resin emulsion pattern paints," JIS K5670 "Acrylic resin-based non-aqueous dispersion paints," and JIS A6909 "Architectural finishing coating materials."

[0030] The release agent composition of the present invention is applied to such a coating at a rate of preferably 0.2 kg / m 2 More than 5.0kg / m 2 Less than or equal to 0.3 kg / m 2 More than 3.0kg / m 2 The coating tool is not particularly limited, and for example, a roller, a brush, a trowel, a spatula, a spray gun, or the like may be used for coating.

[0031] Furthermore, the stripping composition of the present invention softens and begins to strip within 30 minutes to 2 hours, and the softening continues even after 24 to 48 hours. Therefore, stripping can be performed at the applicator's convenience, such as the next day. The stripping tool is not particularly limited, and stripping can be performed using, for example, a trowel, a spatula, a scraper, or the like. [Example]

[0032] The following examples will clarify the features of the present invention.

[0033] The following raw materials were uniformly mixed in the weight ratios shown in Table 1 to obtain release agents 1 to 8. A1: Methyl decanoate A2: Methyl octanoate A3: methyl 2-ethylhexanoate B1: Methyl octadecanoate B2: Methyl hexadecanoate B3: Methyl oleate B4: Methyl linoleate B5: Butyl octadecanoate Solvent 1: Methyl propionate Solvent 2: Benzyl alcohol Solvent 3: Dibasic acid ester Solvent 4: N-methylpyrrolidone Solvent 5: Xylene Wax: solid paraffin wax Thickener: Bentonite

[0034] [Table 1]

[0035] (test) The surfaces were placed so that the coating surfaces shown below were vertical, and the release agents shown in Table 1 were applied with a roller in the required amounts shown below, and the following tests were carried out. Coating surface: An acrylic silicone resin paint whose main components are acrylic silicone resin and titanium oxide was sprayed onto one side of a slate board (300 x 150 x 6 mm) to form a coating film with a thickness of 0.3 mm. This was then exposed for 400 hours in an accelerated weather resistance testing machine, "Eye Super UV Tester" (manufactured by Iwasaki Electric Co., Ltd.), to form the coating surface. Amount of release agent required: 0.5 kg / m 2 .

[0036] (Test 1) Peelability 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.

[0037] (Test 2) Durability of peeling effect 48 hours after application, the coating was peeled off using a spatula and the degree of peeling was evaluated. The evaluation was the same as in Test 2. The results are shown in Table 1.

Claims

1. (A) a monoester of a fatty acid having 6 to 12 carbon atoms, and (B) a monoester of a fatty acid having from 13 to 30 carbon atoms; Including, The release agent composition further comprises a thickener, wherein the thickener is at least one selected from the group consisting of clay minerals such as sepiolite, palygorskite, bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volkonskoite, sauconite, stevensite, fluorohectorite, laponite, rectonite, vermiculite, illite, makatite, kanemite, illielite, magadiite, and kenyaite; swellable silica; cellulose or a cellulose derivative; and polyacrylic acid polymer.

2. 2. The stripping composition according to claim 1, comprising 10 parts by weight or more and 500 parts by weight or less of the component (B) per 100 parts by weight of the component (A).

3. The stripping agent composition according to claim 1, further comprising a solvent, wherein the solvent is one or more selected from the group consisting of dibasic acid esters, aromatic alcohols, and N-methylpyrrolidone.

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