JP6946102B2 - Coating film peeling composition and coating film peeling method - Google Patents

Description

The present invention relates to a peeling composition for peeling a coating film formed on a surface such as a floor and a method for peeling the coating film.

Convenience stores, fast food stores, restaurants, various shops, supermarkets, department stores, and other interior materials for buildings such as offices, schools, hospitals, and factories. The coating may be coated for the purpose of improving durability, imparting luster, and preventing slipping. For example, floors of buildings such as convenience stores and fast food stores are mainly composed of wax-based floor polish and photo-curable resin, which has improved stain resistance and gloss retention compared to wax. A coating agent or the like is coated. When such a floor polish or coating agent deteriorates over time, there is a method of repainting (recoating) the deteriorated floor polish or coating agent without peeling it off, but repeated recoating causes unevenness or peeling of the coating film. It is easy to occur. Therefore, a method is known in which a floor polish or coating agent that has deteriorated over time is peeled off and removed, and then recoated. As a method of peeling and removing deteriorated floor polish and coating agent, a method of using a polishing pad is known, but the polishing pad is severely damaged and dust is scattered at the time of peeling to improve the work environment. It was low. Therefore, a release agent composition is used in peeling and removing floor polish using a polishing pad.

Japanese Patent Application Laid-Open No. 2002-309127 (Patent Document 1) describes a lower alcohol of more than 5% by weight and less than 90% by weight, an inorganic alkali of more than 0.5% by weight and less than 5% by weight, and more than 0.5% by weight. A release agent for a photocurable resin coating film containing less than 20% by weight of amines is disclosed.

However, since this release agent uses alcohols, alkalis and amines, there are problems in the working environment and hygiene, and since it becomes an industrial waste, it has a large global environmental load. Further, when recoating after peeling, the organic solvent and alkali remain on the floor material, so that the adhesion between the photocurable resin coating film and the floor material is lowered, and the coating film peeling occurs. Further, since the photocurable resin coating film is a hard coating film having excellent durability, the peelability is not sufficient.

On the other hand, according to Japanese Patent Publication No. 6-43600 (Patent Document 2), 80 to 20% by weight of carboxymethyl cellulose ether alkali metal salt (CMC) having a degree of substitution of 1.3 or more and fine amorphous cellulose (CMC) are added to the main component abrasive. A liquid cleanser composition having excellent dispersion stability is disclosed, which comprises a composite with 20 to 80% by weight of MFC) and addition of amorphous silica and alcohols. In the examples, an abrasive (a mixture of 50% silica sand and 50% iron oxide) 40-60%, a composite of CMC and MFC 0.2-0.7%, propylene glycol 2-6%, dodecylbenzenesulfone. A liquid cleanser composition consisting of a soda residue and an amorphous silica residue has been prepared.

However, this document does not describe the object to be polished. Furthermore, alcohols such as propinelen glycol are indispensable, the handling is low, and the environmental load is large.

Japanese Unexamined Patent Publication No. 61-257763 (Patent Document 3) discloses an abrasive in which abrasive grains and a hydrophilic fibrous substance are dispersed in an aqueous dispersion medium. This document describes that the fiber diameter of the hydrophilic fibrous substance is preferably 0.2 to 5 times that of the abrasive grains. In the example, 1 g of single crystal diamond having an average particle size of 3 μm was mixed with 20 ml of an aqueous dispersion containing 1% by weight of microfibril cellulose, and then 20 ml of an aqueous solution containing 0.1% by weight of methyl cellulose was added as a thickener. Further, 80 ml of water and a rust preventive are added to prepare a polishing agent, and ferrite is polished to finish the wrap.

However, it is only described that this abrasive is used for wrap finishing in precision processing of metals, glass, etc., and it is not described about peeling of a coating film of a building or the like.

According to Japanese Patent No. 4282848 (Patent Document 4), inorganic particles are 0.1 to 80% by weight, the average degree of polymerization is 100 or less, the fraction of cellulose type I crystal component is 0.1 or less, and the content of cellulose type II crystal component. An inorganic particle dispersion composition in which 0.1 to 10% by weight of cellulose having a ratio of 0.4 or less and an average particle size of 5 μm or less is uniformly dispersed in a liquid dispersion medium is disclosed. In this document, the dispersion composition is used for polishing liquids for precision polishing, ultra-precision polishing required for manufacturing silicon wafers, cleaning agents for household cleansers, various compounds such as waxes for automobiles, dentifrices, and the like. It is described that it can be used as a polishing composition used in a polishing process of a substance surface. In the example, as the polishing composition, an aqueous dispersion (abrasive) containing 2% by weight of silicic acid anhydride, 15% by weight of glycerin, and 1.2% by weight of cellulose, and 10% by weight of aluminum oxide having an average particle size of 0.8 μm. An aqueous dispersion containing% and 1.2% by weight of cellulose (disc substrate finishing abrasive) and an aqueous dispersion containing 10% by weight of silica having a particle diameter of 150 nm and 2% by weight of cellulose (aluminum wafer abrasive) have been prepared. ..

However, it is only described that this abrasive is also used for ultra-precision polishing, dentifrice, etc., and there is no description about peeling of a coating film of a building or the like.

JP-A-2002-309127 (Claim 1) Japanese Patent Publication No. 6-43600 (Claim 1, Example) Japanese Patent Application Laid-Open No. 61-257763 (Claims No. 1, page 2, lower right column, lines 10-12, Examples) Japanese Patent No. 4282848 (Claim 1, paragraph [0030], Examples)

Therefore, an object of the present invention is a coating film peeling composition and a coating film that can efficiently peel a coating film from an object to be peeled by a method that is excellent in handleability without deteriorating the working environment and has a small load on the global environment. To provide a method of peeling.

Another object of the present invention is to provide a coating film peeling composition and a coating film peeling method capable of improving the adhesion to the coating film to be recoated.

Still another object of the present invention is the peeling of a coating film peeling composition and a coating film that can improve the peelability even if the coating film is formed of a cured product of a curable resin and can suppress damage to the object to be peeled. To provide a method.

When the present inventor uses an aqueous dispersion containing abrasive grains, fine celluloses and water as a release agent, it is easy to handle without deteriorating the working environment and is peeled off by a method with a small load on the global environment. The present invention has been completed by finding that the coating film can be efficiently peeled off from the body (base material or base).

That is, the peeling composition of the present invention is a peeling composition for peeling a coating film in close contact with a peeled body from the peeled body, and is an aqueous dispersion containing abrasive grains, fine celluloses and water. The body. The fine celluloses may be fine fibrous cellulose and / or granular cellulose. The fine celluloses may be fine fibrous cellulose having an average fiber diameter of 0.001 to 20 μm and an average fiber length of 20 to 5000 μm. The Mohs hardness of the abrasive grains may be 3 or more. The abrasive grains may be inorganic particles (particularly metal oxide particles). The average particle size of the abrasive grains may be 1 μm or more. The peeling composition of the present invention may contain 0.1 to 100 parts by weight of the fine celluloses and 100 to 3000 parts by weight of water with respect to 100 parts by weight of the abrasive grains. The coating film may contain at least one selected from the group consisting of a cured product of a thermoplastic resin, a cured product of a thermosetting resin, and a cured product of a photocurable resin. The coating film may contain a cured product of an ultraviolet curable resin. The average thickness of the coating film may be 1 μm or more. The peeled body may be an interior material (particularly a floor material) of a building.

The present invention also includes a method of peeling a coating film in close contact with a peeled body from the peeled body by using the peeling composition.

In the present invention, since an aqueous dispersion containing abrasive grains, fine celluloses and water is used as a release agent, the material to be peeled is excellent in handleability without deteriorating the working environment and has a small load on the global environment. The coating film can be peeled off efficiently. Specifically, you can work in a safe water-based environment, there is no odor, no harmful waste such as organic solvents and alkalis is generated, the peeling efficiency of the coating film is dramatically improved, and the work time can be shortened. Even after peeling, recoating is possible by simply wiping with water and drying. In addition, since no organic solvent or alkali remains, the adhesion to the coating film to be recoated can be improved. Further, by selecting a specific polishing abrasive grain, the peelability can be improved even in a coating film formed of a cured product of a curable resin, and damage to the object to be peeled can be suppressed.

[Abrasive abrasive grains]
The aqueous dispersion constituting the peeling composition of the present invention contains abrasive grains. As the polishing abrasive grains, a conventional granular abrasive can be used, but polishing abrasive grains having a high Mohs hardness are preferable because of their high peeling ability. The Mohs hardness of the abrasive grains is preferably 3 or more (that is, 3 to 10), but is preferably 4 to 9 (for example, 5 to 9), for example, from the viewpoint of high peeling ability and suppression of damage to the object to be peeled. It may be about 6 to 9 (for example, 7 to 9), more preferably about 8 to 9 (particularly 9). If the Mohs hardness is too low, the peeling ability may decrease.

The abrasive grains may be organic particles as long as they have such a hardness, but the abrasive grains having such a Mohs hardness are usually inorganic particles.

Examples of the inorganic particles include carbon material (diamond), silicon carbide, boron carbide, silicon nitride, boron nitride, carbon nitride, glass, simple metal, alloy, and metal nitride (aluminum nitride, titanium nitride, molybdenum nitride, chromium nitride). , Tungsten nitride, Haunium nitride, Vanadium nitride, Niobide nitride, Tantal nitride, etc.), Metal carbides (Titanium carbide, Tungsten carbide, Chromium carbide, Molybdenum carbide, Vanadium carbide, Niobium carbide, Tantal carbide, etc.) Titanium, zirconium borate, etc.), metal silicate (calcium silicate, aluminum silicate, magnesium silicate, magnesium aluminosilicate, etc.), metal sulfate (barium sulfate, etc.), metal phosphate (calcium phosphate, etc.), metal carbonate (carbonate, etc.) Magnesium, calcium carbonate, etc.), metal oxides (alumina, zirconia, titania, silica, cerium oxide, zinc oxide, vanadium oxide, iron oxide, chromium oxide, molybdenum oxide, niobium oxide, tantalum oxide, tungsten oxide, haunium oxide, etc.) , Metal hydroxides (aluminum hydroxide, calcium hydroxide, magnesium hydroxide, etc.), minerals (zeolite, apatite, quartz, corundum, topaz, talite, fluorite, orthogonal stone, keisou soil, calcined siliceous soil, kaolin , Serisite, bentonite, smectite, etc.) can be used.

These inorganic particles can be used alone or in combination of two or more. Among these inorganic particles, particles formed of metal oxides or mineral substances are preferable because they have high peeling ability and damage to the object to be peeled can be suppressed, and metal oxidation is excellent because they are easily available. Physical particles (for example, alumina particles having a Morse hardness of 9) are particularly preferable.

The shape of the abrasive grains is not particularly limited, and may be an irregular shape, a fibrous shape, an ellipsoidal shape, a spherical shape, a flat plate shape, a powder granular shape, or the like, and is usually an irregular shape, a powder granular shape, or the like.

The average particle size of the abrasive grains is preferably 1 μm or more (for example, 1 to 1000 μm), preferably 3 to 300 μm (for example, 5 to 200 μm), preferably 10 to 100 μm (for example, 15 to 50 μm), and further, from the viewpoint of peeling ability. preferably 2 0~40μ m extent.

The particle size distribution of the abrasive grains is preferably wide from the viewpoint of improving the peeling ability, and may be, for example, substantially evenly and widely distributed within the range of the average particle size. The mechanism by which the peeling ability is improved is unknown, but when abrasive grains having different particle sizes are mixed, the peeling ability is improved. Further, from the same viewpoint, the abrasive grains may be a combination of a plurality of abrasive grains having different particle sizes, for example, abrasive grains having a large particle size (for example, 30 to 300 μm, preferably 35 to 100 μm). , More preferably a large particle size group having a particle size in the range of 40 to 80 μm) and a small particle size abrasive grain (for example, 1 μm or more and less than 30 μm, preferably 3 to 25 μm, preferably 5 to 20 μm. Combination with a small particle size group having a diameter (combination of two particle size groups) or a large particle size abrasive grains (for example, 40 to 100 μm, preferably 45 to 60 μm, more preferably 48 to 52 μm). Large particle size group) and medium particle size abrasive grains (for example, medium particle size group having particle size in the range of 20 μm or more and less than 40 μm, preferably 25 to 35 μm, preferably 28 to 32 μm). , Combination with a small particle size abrasive grain (for example, a small particle size group having a particle size in the range of 1 μm or more and less than 20 μm, preferably 5 to 15 μm, preferably 8 to 12 μm) (combination of three types of particle size groups) ) May be.

When a plurality of abrasive grain groups having different average particle sizes are used in combination, the weight ratio of one particle size group (one particle size group) to the other particle size group (the other particle size group) is 1. A range of 10 to 10 times is preferable. In the combination of the two particle size groups, the weight ratio of the small particle size group is, for example, 1/10 to 10 times, preferably 1/5 to 5 times, more preferably 1 times the weight of the large particle size group. / 2 to 2 times, more preferably 1 / 1.5 to 1.5 times, even more preferably 1 / 1.2 to 1.2 times, most preferably about 1 / 1.1 to 1.1 times. be. In the combination of three or more particle size groups, the ratio of the other particle size groups (each particle size group) to the weight of the particle size group having the highest weight ratio is, for example, 1/10 to 1 times, preferably 1/5. ~ 1 times, more preferably 1/2 to 1 times, more preferably 1 / 1.5 to 1 times, even more preferably 1 / 1.2 to 1 times, most preferably 1 / 1.1 to 1 times. Degree.

[Fine celluloses]
The aqueous dispersion constituting the peeling composition of the present invention further contains fine celluloses in addition to the abrasive grains. In the present invention, by combining the abrasive grains and fine celluloses, the abrasive grains can be uniformly dispersed, evaporation of water can be suppressed to improve the peeling ability of the coating film, and water during work can be improved. Since scattering can be suppressed, the working environment can be improved. That is, in the present invention, the fine celluloses have a thickening action that can suppress the scattering of water, a moisturizing action that prevents evaporation of water during the peeling operation, and a stabilizing action of an abrasive that disperses abrasive grains and prevents sedimentation. have.

The material of the fine celluloses is not particularly limited as long as it is formed of a polysaccharide having a β-1,4-glucan structure, and is not particularly limited. Pulp, etc.), bamboo fiber, sugar cane fiber, seed hair fiber (cotton linter, bonbucks cotton, capoc, etc.), cellulose fiber (eg, hemp, corn, honey, etc.), leaf fiber (eg, Manila hemp, New Zealand hemp, etc.) Natural cellulose fibers (pulp fibers) or crushed products thereof, etc.], animal-derived cellulose (such as squirrel cellulose), bacterial-derived cellulose (such as cellulose contained in Natadecoco), chemically synthesized cellulose [for example, hydroxy Alkyl cellulose (for example, hydroxyethyl cellulose (HEC), hydroxypropyl cellulose, etc.); carboxyalkyl cellulose (carboxymethyl cellulose (CMC), etc.); cellulose derivatives such as alkyl cellulose (methyl cellulose, ethyl cellulose, etc.)] and the like. These materials may be used alone or in combination of two or more. Of these, water-insoluble cellulose (for example, unmodified or unmodified cellulose) is preferable, and cellulose derived from higher plants such as wood pulp is particularly preferable, because it is excellent in wiping property after peeling.

The fine celluloses may be fine as long as they are fine, and the shape is not particularly limited, but they are usually fibrous or granular.

When the fine celluloses are fibrous celluloses (particularly, fine fibrous celluloses), the average fiber diameter of the fibrous celluloses is about 10 μm or less, for example, 0.001 to 10 μm, preferably 0.005 to 5 μm (. For example, 0.01 to 1 μm), more preferably 0.03 to 0.5 μm (particularly 0.05 to 0.3 μm). If the average fiber diameter of the fibrous celluloses is too large, the peeling ability of the coating film may decrease, and if it is too small, the peeling ability of the coating film and the effect of suppressing water scattering may decrease. ..

The average fiber length of the fibrous celluloses is about 20 μm or more, for example, about 20 to 5000 μm, preferably about 50 to 3000 μm (for example, 100 to 1000 μm), and more preferably about 200 to 800 μm (particularly 250 to 500 μm). If the average fiber length of the fibrous celluloses is too long, the peeling ability of the coating film may decrease, and if it is too short, the peeling ability of the coating film and the effect of suppressing water scattering may decrease. be.

The ratio (aspect ratio) of the average fiber length to the average fiber diameter of the fibrous cellulose may be 10 or more, for example, 10 to 10000, preferably 100 to 8000, and more preferably 500 to 5000 (particularly 1000 to 4000). Degree. If the aspect ratio is too small, the peeling ability of the coating film and the effect of suppressing water scattering may decrease, and if it is too large, the peeling ability of the coating film may decrease.

In the present specification and claims, the average fiber diameter and average fiber length of fibrous celluloses are values calculated from fibers (n = about 20) measured based on electron micrographs.

The cross-sectional shape of the fibrous celluloses (cross-sectional shape perpendicular to the length direction of the fibers) may be an anisotropic shape (flat shape) such as bacterial cellulose, but in the case of plant-derived fibrous cellulose, it may be an anisotropic shape. Usually, it has a substantially isotropic shape. Examples of the substantially isotropic shape include a perfect circular shape and a regular polygonal shape. In the case of a substantially circular shape, the ratio of the major axis to the minor axis is, for example, about 1 to 2, preferably 1 to 1.5, and more preferably 1 to 1.3 (particularly 1 to 1.2). Fibrous celluloses having a substantially isotropic cross-sectional shape of the fiber can be obtained, for example, by microfibrillating plant-derived cellulose and hydrolyzing it with an acid.

When the fine celluloses are granular celluloses (particularly granular celluloses), the average particle size of the granular celluloses is, for example, 10 to 500 μm (for example, 15 to 300 μm), preferably 20 to 100 μm (for example, 30 to 80 μm), and further. It is preferably about 35 to 60 μm (particularly 40 to 50 μm). If the average particle size of the granular celluloses is too large, the peeling ability of the coating film may decrease, and if it is too small, the peeling ability of the coating film and the effect of suppressing water scattering may decrease.

The crystallinity of the cellulose forming the fine cellulose fibers may be 20% or more, for example, 20 to 80%, preferably 30 to 80%, more preferably 60 to 75% (particularly 65 to 75%). ) May be the case. If the crystallinity is too small, the wiping property after peeling may deteriorate. In the present specification and claims, the crystallinity can be measured by measuring X-ray diffraction (“RINT1500” manufactured by Rigaku Denki Co., Ltd.).

Among these fine celluloses, fibrous celluloses are preferable from the viewpoint of improving the peeling ability of the coating film.

The ratio of the fine celluloses is, for example, 0.1 to 100 parts by weight, preferably 1 to 50 parts by weight (for example, 2 to 30 parts by weight), more preferably 3 to 20 parts by weight, based on 100 parts by weight of the abrasive grains. (Especially 5 to 10 parts by weight). If the proportion of fine celluloses is too small, the peeling ability of the coating film and the effect of suppressing water scattering may decrease, and if the proportion of fine celluloses is too large, the peeling ability of the coating film may decrease. be.

[Surfactant]
The aqueous dispersion constituting the peeling composition of the present invention may contain a surfactant in addition to the abrasive grains and fine celluloses.

Examples of the surfactant include anionic surfactants (alkylbenzene sulfonate, α-olefin sulfonate, long chain fatty acid salt, alkane sulfonate, alkyl sulfate, polyoxyethylene alkyl ether sulfate, naphthalene. Formalin sulfonate condensate, alkyl phosphate, etc.), nonionic surfactant (polyethylene glycol type nonionic surfactant, polyhydric alcohol type nonionic surfactant, etc.), cationic surfactant (alkyltrimethyl) Ammonium salts, dialkyldimethylammonium salts, etc.), amphoteric surfactants (alkylbetaine, imidazoline derivatives, etc.) and the like. These surfactants can be used alone or in combination of two or more.

Among these surfactants, anionic surfactants such as alkylbenzene sulfonates (for example, _C8-24 alkylbenzene sulfonates such as sodium laurylbenzene sulfonate) and polyhydric alcohols from the viewpoint of dispersibility and the like. Nonionic surfactants such as fatty acid esters and polyoxyethylene are preferred.

The ratio of the surfactant is, for example, 0.5 to 30 parts by weight, preferably 1 to 20 parts by weight, more preferably 2 to 10 parts by weight (particularly 3 to 8 parts by weight) with respect to 100 parts by weight of the abrasive grains. Degree. If the proportion of the surfactant is too small, the homogeneity of the peeling composition may be lowered and the coating film peeling ability may be lowered, and conversely, if it is too large, the coating film peeling ability may be lowered. ..

[Methods for preparing other additives, water and compositions]
The aqueous dispersion constituting the peeling composition of the present invention may contain other additives in addition to the abrasive grains and fine celluloses. Other additives include, for example, thickeners, thixotropy-imparting agents, stabilizers (antioxidants, UV absorbers, heat stabilizers), polishing aids, fillers, emulsion stabilizers, lubricants, preservatives, etc. Wetting agents, plasticizing agents, defoaming agents, defoaming agents and the like can be mentioned. The ratio of the other additive is, for example, 0.01 to 30 parts by weight, preferably 0.1 to 10 parts by weight, and more preferably 0.5 to 5 parts by weight with respect to 100 parts by weight of the abrasive grains. ..

In the aqueous dispersion constituting the peeling composition of the present invention, the ratio of water to 100 parts by weight of the abrasive grains is, for example, 100 to 3000 parts by weight, preferably 500 to 2000 parts by weight, and more preferably 600 to 600 parts by weight. It is about 1500 parts by weight (particularly 700 to 1000 parts by weight). If the proportion of water is too small, the fluidity may decrease and the workability may decrease, and conversely, if the proportion of water is too large, the peeling ability of the coating film may decrease.

The peeling composition of the present invention can be prepared by a conventional mixing method, and may be, for example, a mixing method of manual stirring using a conventional stirring means, for example, a stirring rod or the like, or a mechanical stirring means (stirr). , A means provided with a stirring blade), a mixing method using an ultrasonic disperser, or the like. Of these, a mixing method using mechanical stirring means is widely used. Examples of the mechanical stirring means include a homomixer, a homogenizer, a homodisper, a Henschel mixer, a Banbury mixer, a ribbon mixer, a V-type mixer, a conventional mixer such as an in-line mixer, and the like.

[Peeling method]
In the present invention, the coating film in close contact with the material to be peeled is peeled from the material to be peeled using the peeling composition. Specifically, the coating film is peeled by polishing (rubbing) with a polishing tool in the presence of the peeling composition. As the polishing tool, a commonly used polishing tool can be used depending on the type of the object to be peeled, and for example, a polishing tool called a polishing pad (polishing pad or polisher), a polishing cloth, or the like can be used. Abrasives are usually made of plastics such as polyamide, polyester and polyurethane. The structure of the polishing tool is also not particularly limited, and may be, for example, a brush, a cloth (for example, a woven cloth, a knitted cloth, a non-woven fabric, a suede shape, etc.), a molded body having a fine uneven structure, a foam, or the like. As the polishing tool, a commercially available polishing tool can be used, and for example, a polishing pad that vibrates by electric energy may be used. The pressure acting on the coating film for polishing and peeling the coating film is, for example, about 50 to 1000 kgf / m ² , preferably 100 to 700 kgf / m ² , and more preferably about 200 to 500 kfg / m ^2.

In the present invention, the peeling composition is usually sprayed on the surface of the coating film in close contact with the object to be peeled off, and then the surface of the coating film is polished with a polishing tool. The spraying method is not particularly limited as long as it can be sprayed substantially uniformly on the surface of the coating film. The amount of the peeling composition sprayed is, for example, 1 to 1000 g, preferably 10 to 500 g, and more preferably about 50 to 300 g with respect to ^{1 m 2 of the surface of the coating film.}

The coating film to be peeled off can be appropriately selected depending on the type of the material to be peeled off, but usually contains a resin component that can be a binder component. The resin component often contains, for example, at least one selected from the group consisting of a cured product of a thermoplastic resin, a thermosetting resin, and a cured product of a photocurable resin.

Examples of the thermoplastic resin include polyolefin, styrene resin, acrylic resin, vinyl chloride resin, polyvinyl alcohol resin, polyacetal, polyester, polycarbonate, polyamide, polyimide, polysulfone resin, polyphenylene ether resin, and polyphenylene sulfide resin. Examples thereof include resins, fluororesins, and cellulose derivatives. These thermoplastic resins can be used alone or in combination of two or more. Of these, acrylic resins and the like are widely used.

Examples of the thermosetting resin include phenol resin, melamine resin, urea resin, benzoguanamine resin, silicone resin, epoxy resin, unsaturated polyester, vinyl ester resin, polyurethane and the like. These thermosetting resins can be used alone or in combination of two or more. Of these, epoxy resins, unsaturated polyesters, silicone resins, polyurethanes and the like are widely used.

Examples of the photocurable resin include a photocurable polyester, a photocurable acrylic resin, a photocurable epoxy (meth) acrylate, and a photocurable urethane (meth) acrylate. These photocurable resins can be used alone or in combination of two or more. Of these, photocurable acrylic resins and photocurable urethane (meth) acrylates are widely used.

Of these, thermosetting resins and photocurable resins are preferable from the viewpoint that the peeling ability of the peeling composition of the present invention can be effectively exhibited, and photocurable resins (particularly, ultraviolet rays such as ultraviolet curable acrylic resins) are used. Curable resin) is particularly preferable.

In addition to the photocurable resin, the coating film containing the cured product of the photocurable resin includes other additives such as other resin components (thermoplastic resin, etc.), photopolymerization initiators, leveling agents, stabilizers ( Heat stabilizers, UV absorbers, light stabilizers, antioxidants, etc.), gloss modifiers, fillers, dispersants, coupling agents, tackifiers, antistatic agents, colorants, flame retardants, lubricants, etc. It may be included. These additives can be used alone or in combination of two or more. Among these additives, photopolymerization initiators, leveling agents, stabilizers such as ultraviolet absorbers, gloss adjusters and the like are widely used. The ratio of the additive is, for example, 0.01 to 30 parts by weight, preferably 0.1 to 20 parts by weight, and more preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the photocurable resin.

The average thickness of the coating film may be 1 μm or more, for example, 5 to 100 μm, preferably 5 to 50 μm, and more preferably about 10 to 30 μm.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. The details of the components used in Examples and Comparative Examples are as follows, and the peeling compositions obtained in Examples and Comparative Examples were evaluated by the following items.

[Ingredients used]
New homing: Dishwashing cleanser, Kao Corporation "New homing cleanser", Abrasive (calcium carbonate with particle size 10-50μ) 91% by weight, Surfactant (alkylbenzene sulfonate) 5% by weight and stabilization Composition containing agent Alumina A: "Product number WA fine powder" manufactured by Naniwa Abrasive Industry Co., Ltd., particle size 50 μm
Alumina B: "Product number WA fine powder" manufactured by Naniwa Abrasives Industry Co., Ltd., particle size 30 μm
Alumina C: "Product number WA fine powder" manufactured by Naniwa Abrasive Industry Co., Ltd., particle size 10 μm
Alumina D: "Product number WA fine powder" manufactured by Naniwa Abrasives Industry Co., Ltd., particle size 3 μm
Silica: Silica powder, Maruto Co., Ltd. "Product number # 200", particle size 10-100 μm, center diameter 36 μm
Diamond: Diamond powder, manufactured by Technorise Co., Ltd., average particle size 30 μm
Serish KY100G: Fine fibrous cellulose, "Selish KY100G" manufactured by Daisel Finechem Co., Ltd., solid content 10% by weight, fiber length 250-350 μm, fiber diameter 0.1 μm
Serish KY100S: Fine fibrous cellulose, "Selish KY100S" manufactured by Daisel Finechem Co., Ltd., solid content 25% by weight, fiber length 350-450 μm, fiber diameter 1 μm
KC Flock W-50GK: Powdered cellulose, "KC Flock W-50GK" manufactured by Nippon Paper Industries, Ltd., average particle size 45 μm
Theoras FD-F20: Microcrystalline cellulose, "Theoras FD-F20" manufactured by Asahi Kasei Chemicals Co., Ltd., average particle size 5 μm
Alkaline cleaning solution: "Doctor 30X" manufactured by Penguin Wax Co., Ltd.
Glycerin: Sakamoto Yakuhin Kogyo Co., Ltd. Surfactant: Sanyo Kasei Kogyo Co., Ltd. "Nonipole Soft SS-90"
Water-based UV curable paint: UV curable resin composition, "Product No. KRM8436N" manufactured by Daicel Ornex Co., Ltd.
2K urethane: thermosetting resin composition, "JK-44265" manufactured by Jujo Chemiko Co., Ltd.
Floor polish: Floor wax composition, "Condor Neo Luce" manufactured by Yamazaki Sangyo Co., Ltd.

Example 1
[Manufacturing of resin coating film]
A vinyl chloride resin flooring material (“Product No. Ronryum” manufactured by Lonseal Corporation) was cleaned with a cloth soaked with isopropyl alcohol and dried at room temperature to obtain a cleaned and dried pre-coating flooring material. .. A water-based UV curable paint is applied to the cleaned and dried pre-coating floor material with a polyester fiber fabric, dried for 60 minutes, and then irradiated with a UV irradiation device ("Product No. HC-12104K1" manufactured by Harrison Toshiba Lighting Co., Ltd.). UV irradiation was performed so as to be 1000 MJ. After that, it was cured for one day. The obtained resin coating film was designated as the resin coating film 1. The thickness of the resin coating film was 10 μm.

[Manufacturing of peeling composition]
In a 20 liter poly bucket, 500 g of alumina A, 500 g of alumina B and 500 g of alumina C as an abrasive, a total of 1500 g, 1000 g of Serish KY100G (solid content 10% by weight) and 12 kg of tap water as a cellulose component are put, and the mixture is stirred with a stirring rod for 3 minutes. The peeling composition 1 was produced. The total weight of the material was 14,500 g.

[Evaluation of polishing performance]
On the floor surface coated with the resin coating film 1, ^{100 g of the peeling composition 1 is sprinkled on the floor surface 1 m 2} , and a high power vibration polisher (“Product No. Edge 20” manufactured by Zao Sangyo Co., Ltd.) is used to polish the weight. The resin coating film was peeled off by reciprocating left and right once at a speed of 1 m / min at 60 kg (pressure 335 kgf / m ^2). After one reciprocation, the position of the polisher was shifted toward the front so that the peeling locations did not overlap, and the same operation was repeated ^{to peel off a total of 10 m 2} of the coating film, and the polishing performance was evaluated by the following method.

(Removability)
The presence or absence of the resin coating film after peeling was visually observed and evaluated according to the following criteria.

⊚: There was no trace of the resin coating film and it was completely peeled off. ○: There was very little trace of the resin coating film, and it was almost peeled off. XX: Almost no peeling of the resin coating film was observed. XX: Scratches on the base were observed.

(Splashing water)
The way water was scattered during work was evaluated according to the following criteria.

◎: There was no splattering during work ○: There was some splattering during work, but it was not at a level that contaminates the surroundings △: Large splatters on walls, etc. It did not function as an abrasive.

(Powder residue)
The removability of the powder remaining on the resin coating film after peeling was evaluated according to the following criteria.

⊚: After drying, it could be easily removed with a vacuum cleaner, etc. ○: After drying, it could be removed by wiping with a cloth, etc. Δ: It was difficult to remove because it stuck to the floor ×: It could not be removed.

(Wipeability after peeling)
The wiping property of the resin coating film after peeling with water was evaluated according to the following criteria.

⊚: Easy to wipe off with one water wipe ○: Wipe off with several water wipes △: Could not be completely wiped off even after several water wipes ×: Could not be wiped off at all.

(Disposal of waste liquid)
The processability when the peeling composition was disposed of as a waste liquid after peeling was evaluated according to the following criteria.

◎: There was no harmful waste and it could be treated as general waste ○: There was no problem in disposal although it contained a small amount of environmentally hazardous substances △: It was possible to dispose of it by separating some of it ×: General disposal It could not be done and was treated as industrial waste.

Examples 2-16 and Comparative Examples 1-5
In the production of the peeling composition, the polishing performance was evaluated in the same manner as in Example 1 except that the peeling composition was produced using the components shown in Tables 1 and 2.

Example 17
In the production of the resin coating film, the same as in Example 1 except that 2K polyurethane is applied with a polyester fiber cloth instead of the water-based UV curable paint and dried for one day to produce the resin coating film 2 (thickness 10 μm). The polishing performance was evaluated.

Example 18
In the production of the resin coating film, polishing is carried out in the same manner as in Example 1 except that floor polish is applied with a mop instead of the water-based UV curable paint and dried for one day to produce the resin coating film 3 (thickness 5 μm). The performance was evaluated.

Tables 1 and 2 show the results of evaluating the polishing performance of the peeling compositions obtained in Examples and Comparative Examples.

As is clear from the results in Tables 1 and 2, the peeling compositions obtained in Examples are excellent in various polishing performances, whereas the peeling compositions obtained in Comparative Examples have various polishing performances. The characteristics could not be compatible.

The peeling composition of the present invention can be used for peeling a coating film for coating various types of objects to be peeled off. For example, a surface material (coating film) of industrial equipment (for example, a waterproof material sheet, a tank, a pipe, etc.) , Surface materials for civil engineering members (for example, bridge members, steel towers, etc.), Surface materials for building exterior materials (for example, outer walls, roofs, door outer surfaces, window frames, monuments, poles, etc.), Building interior materials (for example, , Walls, floors, ceilings, tiles, etc.), surface materials for fittings (eg, skirting boards, skirting boards, door frames, handles, doors, window frames, etc.), furniture (eg, porcelain, shelves, desks, cabinets, etc.) Surface materials, musical instrument surface materials, housing member surface materials for electrical equipment (for example, TV receivers, etc.), surface materials for home appliances (for example, refrigerator doors, etc.), vehicles (for example, automobiles, trains, ships, etc.) Etc.), which can be used as a surface material for interior and exterior materials, and is particularly useful for floor polishing and coating agents (especially coating agents mainly composed of photocurable resin) of buildings such as convenience stores and fast food stores. Is.

Claims (12)

A stripping composition for stripping a coating film in close contact with the object to be peeled body using a grinding tool from the object to be peeled member, abrasive grains, Ri aqueous dispersion der containing fine cellulose and water, and the abrasive grains are stripping compositions Ru Oh metal oxide particles. The peeling composition according to claim 1, wherein the fine celluloses are fine fibrous cellulose and / or granular cellulose. The peeling composition according to claim 1 or 2, wherein the fine celluloses are fine fibrous celluloses having an average fiber diameter of 0.001 to 20 μm and an average fiber length of 20 to 5000 μm. The peeling composition according to any one of claims 1 to 3, wherein the polishing abrasive grains have a Mohs hardness of 3 or more. The peeling composition according to any one of claims 1 to 4 , wherein the average particle size of the abrasive grains is 1 μm or more. The peeling composition according to any one of claims 1 to 5 , which contains 0.1 to 100 parts by weight of fine cellulose and 100 to 3000 parts by weight of water with respect to 100 parts by weight of abrasive grains. The peeling composition according to any one of claims 1 to 6 , wherein the coating film contains at least one selected from the group consisting of a cured product of a thermoplastic resin, a cured product of a thermosetting resin, and a cured product of a photocurable resin. .. The peeling composition according to any one of claims 1 to 7 , wherein the coating film contains a cured product of an ultraviolet curable resin. The peeling composition according to any one of claims 1 to 8 , wherein the average thickness of the coating film is 1 μm or more. The peeling composition according to any one of claims 1 to 9 , wherein the peeled body is an interior material of a building. The peeling composition according to any one of claims 1 to 10 , wherein the peeled body is a floor material. A method for peeling a coating film in close contact with a peeled body from the peeled body by using a polishing tool and the peeling composition according to any one of claims 1 to 11.