Aggregate-containing resin composition and repair method using the same

Abstract

To provide a resin composition which is curable in a short time under a wide temperature condition from a normal temperature to a low temperature, and has good adhesive strength and low odor, and a repair method of a cement asphalt mortar layer of a slab track using the same.SOLUTION: Viscosity of a resin composition at 23°C, which is measured by a Brookfield type viscometer BM type according to JIS-Z 8803, is 10 to 200 mPa s, an aggregate and a curing agent are blended with the resin composition, a time required until the viscosity of the resin composition at -10°C, which is measured by the Brookfield type viscometer BM type according to JIS-Z 8803, reaches 40,000 mPa s is 15 to 60 minutes, and a flash point of the resin composition is 21°C or higher.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin composition containing aggregate and a repair method using the same. [Background technology]

[0002] BACKGROUND ART Unsaturated polyester resins, epoxy resins, polyurethane resins, etc. have hitherto been used as coating agents for forming coating films on substrates such as floors, walls, and road pavements. Generally, unsaturated polyester resins have excellent solvent resistance, but are poor in weather resistance, suffer from significant shrinkage during curing, and are poor in workability at low temperatures. Epoxy resins have excellent alkali resistance and excellent adhesion to substrates, but are poor in weather resistance, require a long curing time, and are poor in curing properties at low temperatures. Polyurethane resins are excellent in elasticity and flexibility, but are poor in chemical resistance and weather resistance. Furthermore, vinyl ester resins and acrylic resins, which have excellent low-temperature curing properties, weather resistance, and chemical resistance, are often used as coating agents. Vinyl ester resins and acrylic resins have a particular odor due to low molecular weight monomers such as styrene and methyl methacrylate, and the odor during use can be a problem.

[0003] The resin materials have been used in various ways as coating agents for forming coating films on substrates such as floors, walls, and road pavements, and coating methods that make use of the texture of stone, aggregate, etc., and methods for backfilling and filling defects have also been proposed.

[0004] Acrylic curable resin compositions containing low-molecular-weight monomers such as methyl methacrylate are known to have short curing times, excellent low-temperature curing properties, and excellent weather resistance and chemical resistance. However, when using an acrylic curable composition as a repair material, if the substrate is an asphalt mixture such as asphalt or asphalt concrete, there are cases where a primer coating is not required to improve adhesion between the substrate and the repair material. If the substrate is concrete, there are cases where adhesion with materials containing aggregates, etc. is insufficient unless a primer is applied. Furthermore, in recent years, interest in environmental issues has been growing, and there has been a tendency to refrain from using resin compositions containing low molecular weight monomers such as styrene and methyl methacrylate, because they are highly volatile and contain components with strong odors, and generally contain the highly flammable methyl methacrylate as their main component, which poses a risk of fire if ignited.

[0005] Patent Document 1 describes that the material is mainly composed of methyl methacrylate, has a small shrinkage rate when hardening, has excellent filling properties, and provides a hardened product with good properties as a filling material and good workability, and is used as a repair material for defects in the cement asphalt mortar layer of railway slab tracks, and can be quickly applied over a wide range of temperature conditions from room temperature to low temperatures, and provides a hardened product with a small shrinkage rate when hardened. The method described in Patent Document 1 allows for curing in a short time from room temperature to low temperatures, but does not take into consideration adhesiveness when curing at lower temperatures. In addition, the resin liquid has a low flash point because it is mainly composed of methyl methacrylate, which has a low flash point. For example, there is room for further improvement in adhesiveness and safety.

[0006] Patent Document 2 describes that the resin filled during repair work does not leak out of the gap, but hardens sufficiently within the gap, and is able to join opposing components across the gap. The method described in Patent Document 2 does not allow for rapid application at temperatures ranging from room temperature to low temperatures, and there is no description of the flash point, so there are problems with the method being somewhat lacking in terms of safety.

[0007] Patent Document 3 describes that it is possible to provide a radical polymerizable resin composition that has low-temperature curing properties and exhibits excellent adhesive strength. The method described in Patent Document 3 has the problem that it cannot be used in winter environments where the temperature falls below 0°C, and that it is somewhat lacking in terms of safety because it uses a monomer with a low flash point in the resin composition. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-98527 [Patent Document 2] Japanese Patent Application Publication No. 2019-183625 [Patent Document 3] International Publication No. 2019 / 004125 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made to solve the above-mentioned problems, and aims to provide a resin composition that can be cured in a short time under a wide range of temperature conditions from room temperature to low temperature, has good adhesive strength, and has a low odor, and a method for repairing a cement asphalt mortar layer of a slab track using the same. [Means for solving the problem]

[0010] That is, the present invention is summarized as follows [1] to

[14] . [1] A resin composition having a viscosity of 10 to 200 mPa·s at 23°C as measured using a Brookfield viscometer, Model BM, specified in JIS-Z8803, and a time required for the viscosity of the resin composition to reach 40,000 mPa·s at -10°C as measured using a Brookfield viscometer, Model BM, specified in JIS-Z8803, when blended with an aggregate and a curing agent, is 15 to 60 minutes, and the flash point of the resin composition is 21°C or higher. [2] The resin composition according to [1], wherein the viscosity of the resin composition measured using a Brookfield viscometer, Model BM, specified in JIS-Z8803 when 100 to 400 parts of aggregate are blended with 100 parts of the resin composition is 800 to 5,000 mPa·s. [3] The resin composition according to [1] or [2], wherein the resin composition containing aggregate and a hardener is poured onto a concrete surface so that the adhesive surface is 20 mm x 20 mm and the thickness is 15 mm, and then hardened. When the resin composition is loaded at 23°C in a shear test so that the loading surface is 15 mm x 20 mm, the adhesive strength is 0.49 MPa or more. [4] The resin composition according to any one of [1] to [3], wherein the aggregate and the curing agent are mixed at a temperature of from -15 to 35°C. [5] The resin composition according to any one of [1] to [4], wherein the cure shrinkage is 5% or less, as calculated by the following formula (1) from the density D1 of an aggregate-containing resin composition, which is obtained by blending 100 to 400 parts of aggregate with 100 parts of the resin composition, measured by a method in accordance with JIS-K5600 2-4, and the density D2 of a cured product of the aggregate-containing resin composition, which is obtained by pouring the aggregate-containing resin composition into a formwork having inner dimensions of 120 mm wide x 120 mm long x 30 mm high, curing the composition, and then cutting out a piece of the aggregate-containing resin composition to a size of 100 mm wide x 100 mm long x 25 mm high: Curing shrinkage rate (%)=[(D2-D1) / D2]×100...Formula (1) In formula (1), "D1" is the density of the liquid resin composition containing aggregate, measured by a method in accordance with JIS K 5600 2-4, and "D2" is the density of the cured resin composition containing aggregate. [6] The resin composition according to any one of [1] to [5], wherein the surface hardness of a cured product of the resin composition containing aggregate is 80 to 99 at 23°C as measured using a Type E durometer specified in JIS-K6253-3. [7] The resin composition according to any one of [1] to [6], wherein the resin composition contains a compound having a polymerizable double bond. [8] The resin composition according to any one of [1] to [7], which is used to pour into a defect in a cement asphalt mortar layer of a slab track when repairing the defect. [9] The resin composition according to [7] or [8], wherein the compound having a polymerizable double bond has a (meth)acryloyl group and an alkyl group or a substituted alkyl group having 3 to 17 carbon atoms.

[10] The resin composition according to any one of [7] to [9], wherein the compound having a polymerizable double bond has a (meth)acryloyl group and an alkyl group or a substituted alkyl group having 3 to 13 carbon atoms.

[11] The resin composition according to any one of [7] to

[10] , wherein the compound having a polymerizable double bond is a polyfunctional (meth)acrylate.

[12] The resin composition according to any one of [1] to

[11] , further comprising a (meth)acrylic polymer.

[13] The compound having a polymerizable double bond has a solubility parameter of 9.5 (cal / cm 3 ) 1 / 2 The resin composition according to any one of [7] to

[12] , which contains the above monomers.

[14] A method for repairing a cement asphalt mortar layer of a slab track, comprising injecting the resin composition according to any one of [1] to

[13] into the cement asphalt mortar layer of the slab track and then allowing it to harden. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a resin composition that can be cured in a short time under a wide range of temperature conditions from room temperature to low temperature, has good adhesive strength, and has a low odor, and a method for repairing a cement asphalt mortar layer of a slab track using the same. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail. In the present invention, "(meth)acrylic" is a general term for acrylic and methacrylic. "(meth)acrylate" is a general term for acrylate and methacrylate. "(meth)acryloyl group" is a general term for acryloyl group and methacryloyl group, and is represented by the general formula CH2=C(R)-C(=O)- [R represents a hydrogen atom or a methyl group]. "Acrylic" is a general term for acrylic and methacrylic.

[0013] The components constituting the resin composition of the present invention include component (A) and component (B), and, if necessary, component (C) and other additive components.

[0014] <Component (A)> An example of the component (A) is the monomer (A). The monomer (A) refers to a monomer having one (meth)acryloyl group. The monomer (A) is a component that can adjust the viscosity of the resin composition and the mechanical strength of the cured coating film formed from the resin composition. Examples of the monomer (A) include the following monomers (a1) to (a3): Among these, it is preferable to incorporate at least one of (a1) because this allows for easy adjustment of the viscosity of the resin composition and easy adjustment of the mechanical strength of the adhesive protective layer formed from the resin composition. Monomer (a1): A (meth)acrylate monomer in which the compound having a polymerizable double bond has a (meth)acryloyl group and an alkyl group or substituted alkyl group having 4 to 13 carbon atoms. Monomer (a2): A compound having a polymerizable double bond with a solubility parameter of 9.5 (cal / cm 3 ) 1 / 2 The above (meth)acrylate monomers. Monomer (a3): A monomer (A) other than the monomer (a1) and the monomer (a2).

[0015] Specific examples of the monomer (a1) include n-butyl acrylate, i-butyl acrylate, t-butyl acrylate, ethylene glycol monomethyl ether methacrylate, ethylene glycol monoethyl ether methacrylate, diethylene glycol monomethyl ether (meth)acrylate, diethylene glycol monoethyl ether (meth)acrylate, 2-ethoxylated 2-ethylhexyl (meth)acrylate, polyethylene glycol monomethyl ether (meth)acrylate, polyethylene glycol monoethyl ether (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, polyethylene glycol mono(meth)acrylate (the number of ethylene glycol repeating units is 6 or less), polypropylene glycol mono(meth)acrylate (polypropylene glycol mono(meth)acrylate), glycidyl group-containing methacrylates such as glycidyl methacrylate; fluorine atom-containing (meth)acrylates such as trifluoroethyl (meth)acrylate, tetrafluoroethyl (meth)acrylate, hexafluoroethyl (meth)acrylate, and octafluoroethyl acrylate; (meth)acrylates having a di- or trialkylcyclohexyl group such as dimethylcyclohexyl (meth)acrylate and trimethylcyclohexyl (meth)acrylate; isobornyl methacrylate; dicyclopentenyloxyethyl (meth)acrylate; (meth)acrylates having a furan ring such as furyl (meth)acrylate, furfuryl (meth)acrylate, tetrahydrofuryl (meth)acrylate, and caprolactone-modified tetrahydrofurfuryl (meth)acrylate; (meth)acrylates having a pyran ring such as pyranyl (meth)acrylate;Examples of the acrylate include (meth)acrylates having a hydropyran ring, such as dihydropyranyl (meth)acrylate, tetrahydropyranyl (meth)acrylate, dimethyldihydropyranyl (meth)acrylate, and dimethyltetrahydropyranyl (meth)acrylate. Among these, from the viewpoint of the mechanical properties of the cured product, it is preferable to use n-butyl (meth)acrylate, i-butyl (meth)acrylate, or t-butyl (meth)acrylate, which has an alkyl group having 4 carbon atoms and a (meth)acryloyl group, as the main component, and it is more preferable to use in combination 2-ethoxylated 2-ethylhexyl (meth)acrylate, polyethylene glycol monomethyl ether (meth)acrylate, polyethylene glycol monoethyl ether (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, or tridecyl (meth)acrylate, which has an alkyl group having 5 to 13 carbon atoms and a (meth)acryloyl group.

[0016] The solubility parameter (hereinafter abbreviated as SP value) of the monomer (a2) means a value calculated by the method described in Volume 14 of Polymer Engineering and Science by Robert F. Fedors et al. Specific examples of the monomer (a2) include benzyl acrylate (SP value 10.1 (cal / cm 3 ) 1 / 2 ), benzyl methacrylate (SP value 10.0 (cal / cm 3 ) 1 / 2 ), cyclohexyl acrylate (SP value 9.7 (cal / cm 3 ) 1 / 2 ), cyclohexyl methacrylate (SP value 9.6 (cal / cm 3 ) 1 / 2 ), phenyl acrylate (SP value 10.1 (cal / cm 3 ) 1 / 2), phenyl methacrylate (SP value 9.7 (cal / cm 3 ) 1 / 2 ), phenoxyethyl acrylate (SP value = 10.1 (cal / cm 3 ) 1 / 2 ), phenoxyethyl methacrylate (SP value 9.7 (cal / cm 3 ) 1 / 2 ), phenoxy polyethylene glycol (meth)acrylate, nonylphenoxy polyethylene glycol (meth)acrylate, phenoxy polypropylene glycol (meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxypropyl phthalate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, 2-(meth)acryloyloxyethyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hydrogen phthalate, ethoxylated ortho-phenylphenol (meth)acrylate, phenol ethylene oxide (EO) modified acrylate, nonylphenol EO modified acrylate, (meth)acrylate monomers having an aromatic ring such as 2-(meth)acryloyloxyethyl phthalate and 2-(meth)acryloyloxyethyl hexahydrophthalate, carboxylic acid-containing (meth)acrylates such as 2-(meth)acryloyloxyethyl maleate; 2-hydroxyethyl acrylate (SP value 12.5 (cal / cm 3 ) 1 / 2 ), 2-hydroxyethyl methacrylate (SP12.1 (cal / cm 3 ) 1 / 2 ), 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate (SP value 11.5 (cal / cm 3 ) 1 / 2 ), 4-hydroxybutyl acrylate (SP value 11.6 (cal / cm 3 ) 1 / 2 ), hydroxyhexyl (meth)acrylate, hydroxyoctyl (meth)acrylate, acryloylmorpholine (SP value 11.2 (cal / cm 3 ) 1 / 2 ), acetoacetoxyethyl methacrylate (SP value 11.2 (cal / cm 3 ) 1 / 2), hydroxyalkyl (meth)acrylates such as glycerin (meth)acrylate, 2-(meth)acryloyloxyethyl succinate, and the like. Among these, benzyl (meth)acrylate, cyclohexyl (meth)acrylate, phenyl (meth)acrylate, phenoxyethyl (meth)acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl (meth)acrylate, and acetoacetoxyethyl methacrylate are preferred, and benzyl (meth)acrylate, cyclohexyl (meth)acrylate, phenoxyethyl (meth)acrylate, 2-hydroxypropyl methacrylate, and 4-hydroxybutyl (meth)acrylate are more preferred. When the (b2) component described below is contained, the total content of the monomer (a2) is preferably 2 parts by mass or more out of a total of 100 parts by mass of the (A), (B), and (C) components. By containing 2 parts by mass or more, compatibility with the (A), (B), and (C) components can be improved. The total content of the monomer (a1) and the monomer (a2) is preferably 55 to 85 parts by mass in 100 parts by mass of the total of the components (A), (B) and (C). In this case, it is more preferable that the total content of the monomer (a1) having a homopolymer glass transition temperature (hereinafter abbreviated as Tg) of 0°C or lower and the monomer (a2) having a homopolymer Tg of 0°C or lower is less than 40 parts by mass out of a total of 100 parts by mass of the components (A), (B), and (C), and that the total content of the monomer (a1) and the monomer (a2) is 55 to 85 parts by mass out of a total of 100 parts by mass of the components (A), (B), and (C).

[0017] The resin composition of the present invention may contain a monomer (a3) ​​other than the monomer (a1) and the monomer (a2) to the extent that the flash point, odor, etc. are not impaired. Specific examples of the monomer (a3) ​​include methyl (meth)acrylate, ethyl (meth)acrylate, (meth)acrylic acid, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, polyethylene glycol mono(meth)acrylate (the number of repeating ethylene glycol units is 7 or more), and polypropylene glycol mono(meth)acrylate (the number of repeating polypropylene glycol units is 5 or more). The content of the monomer (a3) ​​is preferably 0 to 15 parts by mass in a total of 100 parts by mass of the components (A), (B) and (C).

[0018] The content of the monomer (A) is preferably 55 to 85 parts by mass, more preferably 60 to 85 parts by mass, based on 100 parts by mass of the total of the (A), (B), and (C) components. By using the monomer (A) in an amount of 55 parts by mass or more, the viscosity of the resin composition does not become too high, resulting in good workability. By using the monomer (A) in an amount of 85 parts by mass or less, the viscosity of the resin composition does not become too low, thereby appropriately suppressing unintended outflow of the resin composition during work. The component (A) may be used alone or in combination of two or more.

[0019] <(B) component> The component (B) used in the resin composition of the present invention is one or more compounds selected from the group consisting of monomers having two or more (meth)acryloyl groups, urethane (meth)acrylates, epoxy (meth)acrylates, polyester (meth)acrylates, and acrylic polymers having a polymerizable double bond and containing 15% by mass or more of a compound having an alkyl group having 2 to 18 carbon atoms and a (meth)acryloyl group as a copolymerization component. The following components (b1), (B2), and (b3) can be used as the component (B).

[0020] <(b1) component> Component (b1) is a monomer having two or more (meth)acryloyl groups. Component (b1) can impart toughness to the coating film after curing and improve the mechanical strength of the cured product.

[0021] Examples of the component (b1) include ethylene glycol di(meth)acrylate, 1,3-propylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, polybutylene glycol di(meth)acrylate, and bisphenol A ethylene oxide adduct di (meth)acrylate, bisphenol A propylene oxide adduct di(meth)acrylate, bisphenol A diglycidyl ether (meth)acrylic acid adduct, neopentyl glycol di(meth)acrylate, 1,4-cyclohexanedimethanol di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, tris(2-(meth)acryloyloxyethyl)isocyanurate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, etc. Among these, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, polybutylene glycol di(meth)acrylate, bisphenol A ethylene oxide adduct di(meth)acrylate, bisphenol A propylene oxide adduct di(meth)acrylate, etc.

[0022] The content of component (b1) is preferably 0 to 20 parts by mass, and more preferably 0 to 15 parts by mass, based on 100 parts by mass of the total of components (A), (B), and (C). When the content of component (b1) is 20 parts by mass or less, the time until curing is not too short, improving coating workability and toughness of the cured product.

[0023] <(b2) component> Component (b2) is an oligomer having two or more (meth)acryloyl groups, and can be used to improve the surface curability of the cured coating film and to adjust the mechanical strength of the cured product. Examples of the component (b2) that can be used in the resin composition of the present invention include urethane (meth)acrylate, epoxy (meth)acrylate, and polyester (meth)acrylate.

[0024] Urethane (meth)acrylates can be obtained, for example, by reacting a polyol, a polyisocyanate, and a hydroxyl group-containing (meth)acrylate. The polyol used to synthesize the urethane (meth)acrylate is a compound having two or more hydroxyl groups in one molecule. Examples of the polyol include polyalkylene glycols such as polyethylene glycol, polypropylene glycol, polybutylene glycol, and polyhexamethylene glycol; addition reaction products of dihydric phenols such as bisphenol A, bisphenol F, and bisphenol S with alkylene oxides such as ethylene oxide and propylene oxide; and polyhydric alcohols such as ethylene glycol, propylene glycol, butanediol, butylene glycol, and methylpentanediol with phthalic acid, isophthalic acid, tetrahydrophthalic acid, Examples of suitable polyols include polyester polyols obtained by reacting polybasic acids such as succinic acid, maleic acid, fumaric acid, adipic acid, sebacic acid, and trimellitic acid with their anhydrides; polylactone diols obtained from alkylene glycols and lactones; and polycarbonate diols having carbonate bonds obtained by reacting diols such as butanediol, pentanediol, hexanediol, heptanediol, octanediol, nonanediol, and cyclohexanedimethanol with carbonating agents such as phosgene and dimethyl carbonate. These polyols may be used alone or in combination of two or more.

[0025] Among these polyols, polycarbonate diols are preferred from the viewpoint of curability, and polycarbonate diols synthesized using butanediol, pentanediol, or hexanediol are more preferred. Furthermore, polybutylene glycol is preferred from the viewpoint of the mechanical properties (elongation at break) of the cured product at low temperatures.

[0026] The polyisocyanate used to synthesize urethane (meth)acrylate is a compound having two or more isocyanate groups per molecule. Examples of the polyisocyanate include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, phenylene diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, and isophorone diisocyanate. Adducts and trimer cyclized compounds of these compounds with water or trimethylolpropane can also be used as polyisocyanates. These polyisocyanates may be used alone or in combination.

[0027] Examples of hydroxyl group-containing (meth)acrylates used to synthesize urethane (meth)acrylate include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, adducts of ε-caprolactone and 2-hydroxyethyl (meth)acrylate, etc. These hydroxyl group-containing (meth)acrylates may be used alone or in combination of two or more.

[0028] If necessary, an allyl group-containing alcohol may be used instead of the hydroxyl group-containing (meth)acrylate. Examples of the allyl group-containing alcohol include allyl alcohol, ethylene glycol monoallyl ether, diethylene glycol monoallyl ether, polyethylene glycol monoallyl ether, propylene glycol monoallyl ether, dipropylene glycol monoallyl ether, polypropylene glycol monoallyl ether, glycerin monoallyl ether, glycerin diallyl ether, trimethylolpropane monoallyl ether, trimethylolpropane diallyl ether, pentaerythritol monoallyl ether, pentaerythritol diallyl ether, and pentaerythritol triallyl ether.

[0029] Epoxy (meth)acrylate can be obtained, for example, by reacting an epoxy resin with (meth)acrylic acid. Examples of the epoxy resin include bisphenol-type epoxy resin and novolac-type epoxy resin.

[0030] Polyester (meth)acrylate can be obtained, for example, by reacting a polybasic acid or its anhydride with a polyhydric alcohol compound and (meth)acrylic acid or glycidyl (meth)acrylate by a known method. Examples of polybasic acids include phthalic acid, isophthalic acid, tetrahydrophthalic acid, succinic acid, maleic acid, fumaric acid, adipic acid, etc., and examples of polybasic acid anhydrides include anhydrides of the above polybasic acids. Examples of polyhydric alcohols include ethylene glycol, propylene glycol, etc.

[0031] The molecular weight of the urethane (meth)acrylate, epoxy (meth)acrylate, and polyester (meth)acrylate is preferably a weight average molecular weight of 30,000 or less from the viewpoint of workability during coating.

[0032] The amount of component (b2) used is preferably 0 to 35 parts by mass, more preferably 0 to 30 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C).

[0033] <Component (b3)> Component (b3) is a component that can improve the viscosity and curability of the resin composition. Component (b3) is preferably soluble in components (A) and (B). Component (b3) preferably contains 15% by mass or more, and more preferably 40% by mass or more, of structural units derived from methyl methacrylate. If the content of structural units derived from methyl methacrylate in component (b3) is less than 15 mass %, the strength of the coating film may be impaired.

[0034] The Tg of component (b3) is preferably 30°C or higher, more preferably 35 to 110°C, and even more preferably 40 to 90°C. When component (b3) has a Tg of 30°C or higher, the surface curing properties of the resin composition are improved. On the other hand, when component (b3) has a Tg of 110°C or lower, the coating film can be prevented from becoming hard and brittle. In addition, when the resin composition is produced, the solubility in monomer (A) is improved.

[0035] The Tg of the component (b3) means the value calculated by the following formula (2) based on the Fox formula. 1 / (273+Tg)=Σ(Wn / (273+Tgn))...Equation (2)

[0036] In formula (2), "Tg" is the glass transition temperature (°C) of component (b3). Component (b3) is a polymer of n types (n≧1) of monomers (1), (2),...(n), "Wn" is the mass fraction of the structural units derived from each monomer that constitutes component (b3), and "Tgn" is the glass transition temperature (°C) of the homopolymer of the structural units derived from each monomer that constitutes component (b3). For these glass transition temperatures, the values ​​described in "Polymer Handbook 3rd Edition" (A Wiley-Interscience Publication, 1989) can be used.

[0037] The type of component (b3) is not particularly limited as long as it is a polymer containing 15% by mass or more of structural units derived from methyl methacrylate, and examples thereof include the following (b3-1) and (b3-2). (b3-1): A homopolymer of methyl methacrylate, or a copolymer of methyl methacrylate and other alkyl (meth)acrylate (provided that the content of structural units derived from methyl methacrylate is 15% by mass or more). (b3-2): A copolymer having a structural unit derived from methyl methacrylate and a structural unit derived from a monomer having a double bond (provided that the structural unit derived from methyl methacrylate is 15% by mass or more). The component (b3) may contain either (b3-1) or (b3-2) or both.

[0038] [Polymer (b3-1)] The polymer (b3-1) is a homopolymer of methyl methacrylate or a copolymer of methyl methacrylate and another alkyl (meth)acrylate (provided that the structural unit derived from methyl methacrylate is 15% by mass or more). Examples of other alkyl (meth)acrylates include methyl acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, t-butyl (meth)acrylate, amyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, and tridecyl (meth)acrylate. ) acrylate, stearyl (meth)acrylate, cyclohexyl (meth)acrylate, benzyl (meth)acrylate, dicyclopentenyl (meth)acrylate, 2-dicyclopentenoxyethyl (meth)acrylate, isobornyl (meth)acrylate, methoxyethyl (meth)acrylate, ethoxyethyl (meth)acrylate, butoxyethyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, (meth)acrylic acid, and the like. The polymer (b3-1) may be used alone or in combination of two or more kinds.

[0039] The weight average molecular weight (hereinafter abbreviated as "Mw") of the polymer (b3-1) is preferably 10,000 to 200,000, more preferably 20,000 to 170,000, and even more preferably 30,000 to 170,000. By setting Mw to the above lower limit or more, the strength of the cured coating film of the resin composition can be improved. By setting Mw to the above upper limit or less, the solubility in the components (A) and (B) can be improved when producing the resin composition. In this specification, the Mw of polymers including polymer (b3-1) means the molecular weight measured by dissolving the resin in a solvent (tetrahydrofuran) and measuring it by gel permeation chromatography (GPC), and converting the molecular weight into polystyrene equivalent.

[0040] The content of polymer (b3-1) is preferably 1 to 25 parts by mass, more preferably 4 to 20 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C) when component (b-2) is not included. Furthermore, when 30 parts by mass or less of component (b-2) are included, the content is preferably 0 to 25 parts by mass, more preferably 4 to 20 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C). When the content of polymer (b3-1) is equal to or less than the upper limit, the resin composition can have a sufficient pot life (hereinafter, the period during which the composition is fluid and can be used for coating work) and can achieve good coating workability. On the other hand, when the content of polymer (b3-1) is equal to or greater than the lower limit, the resin composition can have a balanced viscosity, its curability can be improved, and the curing time can be appropriately shortened.

[0041] The content of polymer (b3-1) is more preferably within the above range (0 to 25 parts by mass) per 100 parts by mass of the total of components (A), (B), and (C), and within a range that satisfies the following formula (3): By satisfying formula (3), the viscosity of the resin composition does not become too high, and good coating workability can be maintained.

[0042] 0<Mw of polymer (b3-1) × content of polymer (b3-1)<1,400,000 Equation (3) In formula (3), the "content of polymer (b3-1)" is the content (parts by mass) of polymer (b3-1) when the total of components A), (B), and (C) is taken as 100 parts by mass.

[0043] When polymer (b3-1) is a mixture of multiple polymers, the total value of the product of Mw and the content of each polymer preferably satisfies the above formula (3). By satisfying the above formula (3), the viscosity of the resin composition does not become too high, and good coating workability can be maintained.

[0044] [Polymer (b3-2)] The polymer (b3-2) is a copolymer having structural units derived from methyl methacrylate and structural units derived from a monomer having a double bond (with the proviso that the structural units derived from methyl methacrylate account for 20% by mass or more). The double bond in polymer (b3-2) is a double bond that participates in a radical polymerization reaction, and examples of the functional group of the double bond include a vinyl group, an allyl group, a (meth)acryloyl group, etc. Polymer (b3-2) is a component that can improve the mechanical strength of a cured coating film of the resin composition.

[0045] The polymer (b3-2) may have a structural unit derived from an acrylic monomer other than the structural unit derived from methyl methacrylate and the structural unit derived from a monomer having a double bond. Examples of the other acrylic monomer include a monofunctional acrylic monomer, a polyfunctional acrylic monomer, and (meth)acrylic acid.

[0046] Specific examples of other acrylic monomers include alkyl (meth)acrylates such as ethyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate; cycloalkyl (meth)acrylates such as isobornyl (meth)acrylate and cyclohexyl (meth)acrylate; and acrylic units not included in either the alkyl (meth)acrylate unit having an alkyl group with two or more carbon atoms or the cycloalkyl (meth)acrylate unit, such as glycidyl (meth)acrylate and (meth)acrylic acid. These may be used alone or in combination of two or more. Among the other acrylic monomers, alkyl methacrylates having an alkyl group with 2 to 4 carbon atoms, isobornyl (meth)acrylate, glycidyl (meth)acrylate, and (meth)acrylic acid are preferred. Among alkyl methacrylates having an alkyl group having 2 to 4 carbon atoms, n-butyl methacrylate, i-butyl methacrylate, t-butyl methacrylate, and sec-butyl methacrylate are more preferred, and n-butyl methacrylate is even more preferred.

[0047] The method for producing the polymer (b3-2) is not particularly limited, but the following production method is preferred. That is, first, in the first-stage reaction, methyl methacrylate, a first reactive monomer having a first functional group capable of forming an ester bond, and, if necessary, other acrylic monomers are copolymerized to obtain a first copolymer having the first functional group. Next, in the second-stage reaction, a second reactive monomer having a double bond and a second functional group capable of reacting with the first functional group to form an ester bond is made to coexist with the first copolymer, and the first functional group and the second functional group are reacted to obtain a polymer (b3-2) having a structural unit derived from methyl methacrylate and a double bond. The combination of the first functional group and the second functional group is preferably a combination of a carboxy group and a glycidyl group, or a combination of a hydroxy group and an isocyanate group.

[0048] More specifically, the following method can be mentioned as a method for producing the polymer (b3-2). In the first stage reaction, methyl methacrylate, (meth)acrylic acid, and, if necessary, other acrylic monomers are copolymerized to obtain a first copolymer having a carboxy group. Next, in the second stage reaction, the obtained first copolymer is dissolved in methyl methacrylate and then coexisted with glycidyl (meth)acrylate. The carboxyl group of the first copolymer reacts with the glycidyl group of the glycidyl (meth)acrylate to form an ester bond, thereby obtaining a polymer (b3-2) having a double bond.

[0049] In the first stage reaction, the polymerization temperature during copolymerization varies depending on the polymerization method, but for example, in the case of suspension polymerization, it is preferably 70 to 98°C, and the polymerization time is preferably about 2 to 5 hours. The reaction temperature in the second stage reaction is preferably 90 to 95°C, and the reaction time is preferably about 1 to 4 hours.

[0050] The composition ratio of the monomers used in the first-stage reaction is preferably 15 to 95 mass % of methyl methacrylate, 85 to 5 mass % of other acrylic monomers, and 0.3 to 4 mass % of (meth)acrylic acid, more preferably 0.3 to 2 mass % of (meth)acrylic acid. In the second-stage reaction, the amount of methyl methacrylate monomer is preferably 70 to 150 parts by mass per 100 parts by mass of the first copolymer. Also, 0.9 to 1.2 moles, and more preferably 1.0 to 1.1 moles, of glycidyl (meth)acrylate are reacted with 1.0 mole of (meth)acrylic acid used in the first-stage reaction.

[0051] When suspension polymerization is carried out as the polymerization method in the first stage reaction, the suspension is preferably an aqueous suspension, and a dispersant is preferably added to the aqueous suspension. The dispersant is not particularly limited, and examples thereof include poorly water-soluble inorganic compounds such as calcium phosphate, aluminum hydroxide, and starch powder silica; nonionic polymer compounds such as polyvinyl alcohol, polyethylene oxide, and cellulose derivatives; and anionic polymer compounds such as alkali metal salts of poly(meth)acrylate and alkali metal salts of copolymers of (meth)acrylic acid and methyl (meth)acrylate. The amount of the dispersant added is preferably 0.005 to 5 mass % relative to the total mass of the suspension, and more preferably 0.01 to 1 mass %.

[0052] The suspension preferably contains an electrolyte such as sodium carbonate, sodium sulfate, or manganese sulfate. The inclusion of an electrolyte can improve dispersion stability. The amount of electrolyte added may be appropriately determined and is not particularly limited.

[0053] In the suspension polymerization, it is preferable to use a polymerization initiator. Examples of the polymerization initiator include organic peroxides such as benzoyl peroxide, lauroyl peroxide, methyl ethyl ketone peroxide, tert-butyl peroxybenzoate, cumene hydroperoxide, cyclohexanone peroxide, dicumyl peroxide, and bis(4-tert-butylcyclohexyl)peroxydicarbonate; and azo compounds such as 2,2'-azobisisobutyronitrile and 2,2'-azobis-2-methylbutyronitrile. These may be used alone or in combination of two or more. The amount and method of adding the polymerization initiator may be appropriately determined and are not particularly limited.

[0054] In the suspension polymerization, it is preferable to use a chain transfer agent, which makes it possible to easily adjust the Mw of the resulting polymer. The chain transfer agent is preferably a thiol compound. Examples of the thiol compound include alkyl mercaptans such as t-butyl mercaptan, n-octyl mercaptan, and n-dodecyl mercaptan; aromatic mercaptans such as thiophenol thionaphthol; and alkyl thioglycolates such as thioglycolic acid and octyl thioglycolate. The amount and method of adding the chain transfer agent may be appropriately determined and are not particularly limited.

[0055] In the second stage reaction, an esterification catalyst can be used to promote the reaction between the first functional group and the second functional group. Examples of the esterification catalyst include amines such as triethylamine, quaternary ammonium salts such as tetraethylammonium chloride and tetrabutylammonium bromide, and phosphorus compounds such as triphenylphosphine. These may be used alone or in combination of two or more. The amount of the esterification catalyst to be added may be appropriately determined and is not particularly limited.

[0056] A polymerization inhibitor may be added in the second stage reaction, which makes the second stage reaction more stable. Examples of the polymerization inhibitor include hydroquinone, hydroquinone monomethyl ether, 2,6-di-t-butyl-4-methylphenol, etc. These may be used alone or in combination of two or more. The amount of the polymerization inhibitor to be added may be set appropriately and is not particularly limited.

[0057] The mass average molecular weight (Mw) of the first copolymer obtained in the first-stage reaction is preferably within the range of 10,000 to 200,000, more preferably 20,000 to 170,000, and even more preferably 30,000 to 170,000. When the weight average molecular weight is equal to or greater than the lower limit, the strength of the cured product tends to be sufficiently high. When the weight average molecular weight is equal to or less than the upper limit, the workability when handling the resin composition is improved.

[0058] The fact that the polymer (b3-2) obtained in the second-stage reaction has a double bond, i.e., that the carboxy group contained in the first copolymer has reacted with the glycidyl group of glycidyl (meth)acrylate in the second-stage reaction, can also be confirmed by the acid value of the polymer (b3-2) being lower than the acid value of the first copolymer. The acid value (unit: mgKOH / g) of the polymer (b3-2) is preferably 1.0 or less, more preferably 0.5 or less. The acid value of the polymer in this specification means the value determined by dissolving the polymer in toluene and titrating it with a 0.1N KOH ethanol solution using phenolphthalein as an indicator.

[0059] The content of polymer (b3-2) is preferably 1 to 25 parts by mass, more preferably 4 to 20 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C) when component (b-2) is not included. Furthermore, the content of polymer (b3-2) is preferably 0 to 25 parts by mass, more preferably 4 to 20 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C) when component (b-2) is 30 parts by mass or less. When the content of polymer (b3-2) is equal to or less than the upper limit, the resin composition can have a sufficient pot life and good coating workability. On the other hand, when the content of polymer (b3-2) is equal to or greater than the lower limit, the resin composition has a good viscosity balance, and curability can be improved, resulting in an appropriate shortening of the curing time.

[0060] The content of polymer (b3-2) is more preferably within the above range (0 to 25 parts by mass) per 100 parts by mass of the total of components (A), (B), and (C) and satisfies the following formula (4): By satisfying formula (4), the viscosity of the resin composition does not become too high, and coating workability can be improved.

[0061] 0<Mw of polymer (b3-2) × content of polymer (b3-2)<1,400,000 Equation (4) In formula (4), the "content of polymer (b3-2)" is the content (parts by mass) of polymer (b3-2) when the total of components (A), (B), and (C) is taken as 100 parts by mass.

[0062] When polymer (b3-2) is a mixture of multiple polymers, the total value of the product of Mw and the content of each polymer preferably satisfies the above formula (4). By satisfying the above formula (4), the viscosity of the resin composition does not become too high, and good coating workability can be maintained.

[0063] The content of polymer (b3) is preferably 1 to 25 parts by mass, more preferably 4 to 20 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C) when component (b-2) is not included. Furthermore, when 30 parts by mass or less of component (b-2) is included, the content is preferably 0 to 25 parts by mass, more preferably 4 to 20 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C). When the content of polymer (b3) is equal to or less than the upper limit, the resin composition can have a sufficient usable life and can be easily applied. On the other hand, when the content of polymer (b3) is equal to or greater than the lower limit, the resin composition has a good viscosity balance, and the curability can be improved, resulting in an appropriate reduction in curing time. When polymer (b3) is a mixture of polymer (b3-1) and polymer (b3-2), it preferably satisfies the following formula (5): By satisfying formula (5), the viscosity of the resin composition does not become too high, and coating workability can be improved.

[0064] 0<{Mw of polymer (b3-1) × content of polymer (b3-1)} + {Mw of polymer (b3-2) × content of polymer (b3-2)} < 1,400,000 Equation (5)

[0065] The content of component (B) is preferably 15 to 35 parts by mass, and more preferably 20 to 35 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C). By making the content of component (B) 15 parts by mass or more, the viscosity of the resin composition does not become too low, separation from the aggregate does not occur, and workability is improved. By making the content of component (B) 35 parts by mass or less, the viscosity of the resin composition does not become too high, improving workability and improving adhesive strength to the substrate.

[0066] <(C) component> The component (C) that can be used as needed in the resin composition of the present invention includes a plasticizer. The plasticizer is a component that can reduce the shrinkage of the coating film during curing. Examples of plasticizers include phthalates such as dibutyl phthalate, di-2-ethylhexyl phthalate, and diisodecyl phthalate; adipates such as di-2-ethylhexyl adipate and octyl adipate; sebacates such as dibutyl sebacate and di-2-ethylhexyl sebacate; alkylsulfonates such as alkylsulfonic acid phenyl ester; dialkyl cyclohexanedicarboxylates such as 1,2-diisononyl cyclohexanedicarboxylate; dibasic fatty acid esters such as azelaic esters such as di-2-ethylhexyl azelate and octyl azelate; and paraffins such as chlorinated paraffin. Plasticizers may be used singly or in combination of two or more. The content of the plasticizer is preferably 15 parts by mass or less per 100 parts by mass of the total of components (A), (B), and (C). By keeping the content of the plasticizer at 15 parts by mass or less, the mechanical strength of the coating film can be improved and the exudation of the plasticizer to the surface of the coating film can be prevented.

[0067] <Other additives> Other additive components that can be used as needed in the resin composition of the present invention include wax, curing accelerator, curing agent, polymerization inhibitor, silane coupling agent, ultraviolet absorber, light resistance stabilizer, thixotropic agent, reinforcing material, other polymer components, isocyanate prepolymer, elastomer, epoxy resin, aggregate, inorganic pigments such as chromium oxide and red iron oxide, organic pigments such as phthalocyanine blue, etc. Furthermore, the resin composition can also contain, as additive components, antifoaming agents, defoaming agents, leveling agents, etc. for the purpose of improving coating workability and appearance, etc.

[0068] [wax] The wax is a component that blocks air from the coating surface during the curing reaction, improving surface curing properties. Wax that does not dissolve in components (A) and (B) can be used. Specific examples of wax include various known waxes such as paraffin wax and microcrystalline wax. The melting point of the wax is preferably 40° C. or higher and 120° C. or lower. Two or more waxes with different melting points can also be used in combination.

[0069] As the wax, a wax dispersed in an organic solvent may be used to improve surface curability. The wax is dispersed in an organic solvent and microparticulated, thereby effectively exhibiting an air barrier effect. Commercially available waxes can be used as the dispersed wax, and the resin composition can be prepared by adding the wax directly. In this case, the resin composition also contains an organic solvent. The dispersed wax may be one in which the wax is dispersed in the components (A) and (B) without containing any organic solvent.

[0070] The wax content is preferably 0.1 to 3 parts by mass, and more preferably 0.1 to 2 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C), from the viewpoint of the balance between the air blocking effect and the physical properties of the coating film. If the wax content is equal to or greater than the lower limit, sufficient air barrier properties can be obtained when the resin composition is applied and cured, and good surface curability can be achieved. If the wax content is equal to or less than the upper limit, the viscosity of the resin composition does not become too high, and the physical properties of the coating film, such as curing speed and stain resistance, tend to be good. In addition, the storage stability of the resin composition is good.

[0071] [Curing accelerator] The resin composition of the present invention preferably contains a curing accelerator. Examples of the curing accelerator include tertiary amines, organometallic compounds, and metal soaps. Specific examples of tertiary amines include N,N-substituted anilines such as N,N-dimethylaniline, N,N-diethylaniline, N,N-dimethyl-p-toluidine, N,N-bis(2-hydroxyethyl)-p-toluidine, 4-(N,N-dimethylamino)benzaldehyde, 4-[N,N-bis(2-hydroxyethyl)amino]benzaldehyde, 4-(N-methyl-N-hydroxyethylamino)benzaldehyde, N,N-bis(2-hydroxypropyl)-p-toluidine, triethanolamine, diethylenetriamine, phenylmorpholine, N,N-bis(hydroxyethyl)aniline and diethanolaniline, N,N-substituted-p-toluidines, and 4-(N,N-substituted amino)benzaldehyde. The tertiary amines may be used alone or in combination of two or more.

[0072] Among tertiary amines, aromatic tertiary amines are preferred. As the aromatic tertiary amine, a compound in which at least one aromatic residue is directly bonded to a nitrogen atom is preferred. Examples of the aromatic tertiary amine include N,N-dimethyl-p-toluidine, N,N-diethylaniline, N,N-diethyl-p-toluidine, N-(2-hydroxyethyl)N-methyl-p-toluidine, N,N-di(2-hydroxyethyl)-p-toluidine, N,N-di(2-hydroxypropyl)-p-toluidine; ethylene oxide or propylene oxide adducts of N,N-di(2-hydroxyethyl)-p-toluidine or N,N-di(2-hydroxypropyl)-p-toluidine, and o (ortho) and m (meta) forms thereof. Among the aromatic tertiary amines, N,N-dimethyl-p-toluidine, N,N-diethyl-p-toluidine, N,N-di(2-hydroxyethyl)-p-toluidine, and N,N-di(2-hydroxypropyl)-p-toluidine are preferred from the viewpoint of the curability of the resin composition.

[0073] The amount of curing accelerator added is preferably 0.05 to 10 parts by mass, more preferably 0.2 to 8 parts by mass, and even more preferably 0.3 to 5 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C), from the viewpoint of the balance between curability and workability, etc. If the amount of curing accelerator added is equal to or greater than the lower limit, good surface curability can be achieved, and if it is equal to or less than the upper limit, an appropriate usable time can be achieved even at low temperatures. The amount of the curing accelerator to be added is preferably adjusted appropriately depending on the type of curing accelerator to be used and the temperature environment.

[0074] Examples of the organometallic compound include cobalt naphthenate, manganese naphthenate, nickel octylate, cobalt octylate, cobalt acetoacetylate, etc. Addition of these organometallic compounds to the resin composition can improve the surface curability.

[0075] In terms of the balance between curability and workability, the amount of organometallic compound added is preferably 0.3 parts by mass or less, and more preferably 0.2 parts by mass or less, of the metal derived from the organometallic compound per 100 parts by mass of the total of components (A), (B), and (C). The amount of the organometallic compound added is preferably adjusted appropriately depending on the type of curing accelerator used and the temperature environment.

[0076] The curing accelerator may be added immediately before curing the resin composition, or may be added to the resin composition in advance.

[0077] [Hardening agent] When curing the resin composition, it is preferable to use the curing accelerator in combination with a curing agent as a redox catalyst. Examples of the curing agent include known curing agents capable of initiating radical polymerization. Specific examples of the curing agent include ketone peroxides such as methyl ethyl ketone peroxide; peroxyketals such as 1,1-di(t-hexylperoxy)-3,3,5-trimethylcyclohexane, 1,1-di(t-hexylperoxy)cyclohexane, and 1,1-di(t-butylperoxy)cyclohexane; hydroperoxides such as 1,1,3,3-tetramethylbutyl hydroperoxide, cumene hydroperoxide, and p-menthane hydroperoxide; dicumyl peroxide; Examples of the curing agent include dialkyl peroxides such as di-t-butyl peroxide, diacyl peroxides such as dilauroyl peroxide and dibenzoyl peroxide, peroxydicarbonates such as di(4-t-butylcyclohexyl)peroxydicarbonate and di(2-ethylhexyl)peroxydicarbonate, and peroxyesters such as t-butylperoxy-2-ethylhexanoate, t-hexylperoxyisopropyl monocarbonate and t-butylperoxybenzoate. One type of the curing agent may be used alone, or two or more types may be used in combination. Among the above curing agents, diacyl peroxides, peroxy esters and hydroperoxides are preferred, and benzoyl peroxide is more preferred. From the viewpoint of ease of handling, benzoyl peroxide is preferably in the form of a liquid, paste, or powder diluted with an inert liquid or solid to a concentration of about 30 to 55% by mass.

[0078] The amount of curing agent added is preferably adjusted appropriately so that the pot life of the resin composition is 15 to 60 minutes. If the curing agent is added in this amount, the polymerization reaction starts quickly after the addition, and the curing of the resin composition can proceed. When benzoyl peroxide is used as the curing agent, the amount added is preferably 0.25 to 5 parts by mass, more preferably 0.25 to 4 parts by mass, per 100 parts by mass of the total of components (A), (B), and (C). Setting the amount of benzoyl peroxide to at least the lower limit mentioned above tends to improve curing properties, while setting it to at most the upper limit mentioned above tends to improve the coating workability of the resin composition and various physical properties of the resulting coating film. However, it is preferable to adjust the amount of curing agent added appropriately depending on the temperature of use.

[0079] [Other polymer components] The resin composition of the present invention may contain other polymer components in addition to the oligomer (b-2) and polymer (b3). Examples of such other polymer components include vinyl chloride-vinyl acetate copolymers, elastomer components, and epoxy resins. The content of such other polymer components is preferably adjusted appropriately so as not to impair the transparency of the cured product.

[0080] Examples of the elastomer component include thermoplastic elastomers such as olefin-based thermoplastic elastomers, polybutadiene-based thermoplastic elastomers, styrene-butadiene thermoplastic elastomers, styrene-isoprene thermoplastic elastomers, etc. The structure of the elastomer component may be linear, branched, grafted, or core / shell.

[0081] The amount of the elastomer component is preferably less than 20 parts by mass per 100 parts by mass of the total of components (A), (B), and (C), and more preferably less than 20 parts by mass and satisfying the following formula (6): By satisfying formula (6), the viscosity of the resin composition does not become too high, and coating workability can be improved.

[0082] 0 < Mw of elastomer component × content of elastomer component < 1,200,000 Equation (6)

[0083] In formula (6), the "elastomer content" is the elastomer content (parts by mass) when the total of components (A), (B), and (C) is taken as 100 parts by mass.

[0084] [Polymerization inhibitor] As the polymerization inhibitor, it is preferable to add hydroquinone, 2-methylhydroquinone, hydroquinone monomethyl ether, 2-6-di-t-butyl-4-methylphenol, etc. for the purpose of improving storage stability.

[0085] [Silane coupling agents] Examples of the silane coupling agent include γ-(glycidoxypropyl)trimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, and silane coupling agents having one (meth)acryloyl group such as 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, and 3-methacryloxypropyltriethoxysilane. Silane coupling agents can be used for the purpose of improving adhesion to inorganic substances. The content of the silane coupling agent is preferably 5 parts by mass or less, and from the viewpoints of curability and cost, more preferably 3 parts by mass or less, per 100 parts by mass of the total of components (A), (B), and (C). By keeping the content of the silane coupling agent at or below the upper limit, the adhesion of the resin composition to inorganic components and surface curability can be improved.

[0086] [UV absorber] The ultraviolet absorber is used for the purpose of improving the weather resistance of the coating film. Examples of ultraviolet absorbers include derivatives of 2-hydroxybenzophenone such as 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-octyloxybenzophenone, 2-hydroxy-4-decyloxybenzophenone, 2-hydroxy-4,4'-dimethoxybenzophenone, and 2-hydroxy-4,4'-dibutoxybenzophenone; 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-ditertiarybutylphenyl)benzotriazole, or halides thereof; phenyl salicylate, p-tertiarybutylphenyl salicylate, etc. These may be used alone or in combination of two or more.

[0087] [Light resistance stabilizer] Examples of light resistance stabilizers include bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate, 1-[2-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxy]ethyl]-4-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxy]-2,2,6,6-tetramethylpiperidine, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, etc. These may be used alone or in combination of two or more.

[0088] [Thixotropic Agents] A thixotropic agent is an additive component that imparts thixotropy to a resin composition. Specifically, the inclusion of a thixotropic agent imparts structural viscosity to the resin composition, increasing the thixotropy, allowing additives to be uniformly distributed in the resin composition, and improving the storage stability of the resin composition. Furthermore, the inclusion of a thixotropic agent can improve the coating workability of the resin composition, for example, when the resin composition is applied to an inclined surface. As the thixotropic agent, organic thixotropic agents such as urethane urea, fatty acid amide, organic bentonite, oxidized polyethylene wax, and finely divided silica are preferred. One type of thixotropic agent may be used alone, or two or more types may be used in combination. Examples of combinations of thixotropic agents include a combination of fatty acid amide and fine silica, a combination of organic bentonite and fine silica, a combination of fatty acid amide, organic bentonite and fine silica, and a combination of oxidized polyethylene wax and fine silica. From the viewpoint of dispersion stability in the resin composition, the average primary particle size of the fine silica is preferably 7 to 40 μm. When the thixotropic agent is at least one of urethane urea, fatty acid amide, and organic bentonite, the content of the thixotropic agent is preferably 5 parts by mass or less per 100 parts by mass of the total of components (A), (B), and (C). When the thixotropic agent is particulate silica, the content of particulate silica is preferably 10 parts by mass or less. If the content of the thixotropic agent is too high, the fluidity of the resin composition decreases, which reduces the coating workability, and it may not be possible to obtain a uniform coating film.

[0089] [Reinforcement material] A reinforcing material is preferably used when the flexibility or tensile elongation at break of the resin composition is excessive for the intended use. Examples of the reinforcing material include chopped strands, glass fibers in the form of a roving net, vinylon fibers, nylon fibers, etc. One type of reinforcing material may be used alone, or two or more types may be used in combination.

[0090] [Antifoaming agent] Examples of the defoaming agent include known defoaming agents, such as acrylic defoaming agents prepared by dissolving a special acrylic polymer in a solvent, and vinyl defoaming agents prepared by dissolving a special vinyl polymer in a solvent. Among the defoaming agents, the Disparlon series (product names: OX-880EF, OX-881, OX-883, OX-77EF, OX-710, OX-8040, 1922, 1927, 1950, P-410EF, P-420, P-425, PD-7, 1970, 230, 230EF, LF-1980, LF-1982, LF-1983, LF-1984, LF-1985, etc.) commercially available from Kusumoto Chemicals Co., Ltd. are preferred, with 230, 230EF, LF-1980, and LF-1985 being more preferred, and 230EF and LF-1985 being even more preferred. BYK-052N and BYK-1752 commercially available from BYK Japan Co., Ltd. can also be used. The antifoaming agent may be used alone or in combination of two or more kinds. The content of the antifoaming agent is preferably 3 parts by mass or less, and more preferably 2 parts by mass or less, per 100 parts by mass of the total of components (A), (B), and (C). When the content is equal to or less than the upper limit, air bubbles that are mixed in when the resin composition is stirred and mixed can be effectively removed, and a coating film free of air bubbles can be obtained.

[0091] [Isocyanate prepolymer] Isocyanate prepolymers are highly reactive and easily react with moisture in the air and the monomer components in the resin composition, so if an acrylic resin composition contains an isocyanate prepolymer, the curing time can be further shortened. Examples of the isocyanate prepolymer include polyisocyanurates obtained by prepolymerizing hexamethylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, tetramethylene diisocyanate, phenylene diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, isophorone diisocyanate, etc. One type of isocyanate prepolymer may be used alone, or two or more types may be used in combination. The content of the isocyanate prepolymer is preferably 30 parts by mass or less per 100 parts by mass of the total of the components (A), (B), and (C). When the content of the isocyanate prepolymer is equal to or less than the upper limit, the curing time can be further shortened while ensuring a sufficient pot life of the resin composition, resulting in good workability.

[0092] [Epoxy resin] Epoxy resin is a component that improves adhesion to inorganic substrates, and therefore, if the resin composition contains an epoxy resin, it can improve adhesion to crushed stone and the like used in concrete and asphalt pavement. Examples of epoxy resins include bisphenol A type epoxy resins, bisphenol F type epoxy resins, biphenyl type epoxy resins, dicyclopentadiene type epoxy resins, polysulfide-modified epoxy resins, etc. One type of epoxy resin may be used alone, or two or more types may be used in combination. The content of the epoxy resin is preferably 20 parts by mass or less, and more preferably 10 parts by mass or less, per 100 parts by mass of the total of the components (A), (B), and (C). When the content of the epoxy resin is equal to or less than the upper limit, the curing time can be shortened while ensuring a sufficient pot life of the resin composition, resulting in good workability.

[0093] [Thiol compounds] The resin composition of the present invention can use a thiol compound. Examples of the thiol compound include aromatic thiophenols and aliphatic thiols. Among these, it is preferable to include an aliphatic thiol. Among the thiol compounds, one or more thiol compounds selected from primary thiol compounds, secondary thiol compounds, and tertiary thiol compounds can be used. In the present invention, by blending a thiol compound, the curability of the thin film can be improved. The thiol compound used in the present invention is not particularly limited as long as it is a compound having one or more thiol groups in the molecule, but from the viewpoint of the curability of thin films that are easily affected by oxygen in the air, polyfunctional thiols, which are compounds having two or more primary or secondary thiol groups in the molecule, are preferred. Among them, polyfunctional thiols, which are compounds having three or more primary or secondary thiol groups in the molecule, are more preferred. The polyfunctional thiol refers to a thiol compound having two or more thiol groups, which are functional groups, in the molecule.

[0094] Specific examples of primary thiol compounds include trimethylolpropane trismercaptoacetate, trimethylolpropane tris(3-mercaptopropionate), trimethylolpropane tris(4-mercaptobutyrate), pentaerythritol tetramercaptoacetate, pentaerythritol tetrakis(3-mercaptopropionate), pentaerythritol tetrakis(4-mercaptobutyrate), dipentaerythritol hexamercaptoacetate, dipentaerythritol hexakis(3-mercaptopropionate), dipentaerythritol hexakis(4-mercaptobutyrate), glycerol tris-(3-mercaptopropionate), glycerol tris-(4-mercaptobutyrate), tetraethylene glycol bismercaptoacetate, and tetraethylene glycol. Examples thereof include bis(3-mercaptopropionate), tetraethylene glycol bis(3-mercaptobutyrate), tris-[(3-mercaptopropionyloxy)-ethyl]-isocyanurate, and tris-[(3-mercaptobutyryloxy)-ethyl]-isocyanurate.

[0095] Specific examples of secondary thiol compounds include 3-mercaptobutyric acid, ethylene glycol bis(3-mercaptobutyrate), propylene glycol bis(3-mercaptobutyrate), diethylene glycol bis(3-mercaptobutyrate), butanediol bis(3-mercaptobutyrate), octanediol bis(3-mercaptobutyrate), trimethylolethane tris(3-mercaptopropionate), trimethylolethane tris(3-mercaptobutyrate), trimethylolpropane tris(3-mercaptobutyrate), pentaerythritol tetrakis(3-mercaptobutyrate), dipentaerythritol hexakis(3-mercaptobutyrate), ethylene glycol bis(2-mercaptopropionate), propylene glycol bis(2-mercaptobutyrate), captopropionate), diethylene glycol bis(2-mercaptopropionate), butanediol bis(2-mercaptopropionate), octanediol bis(2-mercaptopropionate), trimethylolpropane tris(2-mercaptopropionate), pentaerythritol tetrakis(2-mercaptopropionate), dipentaerythritol hexakis(2-mercaptopropionate), ethylene glycol bis(4-mercaptovalerate), diethylene glycol bis(4-mercaptovalerate), butanediol bis(4-mercaptovalerate), 1,4-bis(3-mercaptobutyryloxy)butane, 1,3,5-tris[2-(3-mercaptobutyryloxyethyl)]-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, octanediol bis(4-mercaptovalerate), trimethylolpropane tris(4-mercaptovalerate), pentaerythritol tetrakis(4-mercaptovalerate), dipentaerythritol hexakis(4-mercaptovalerate), ethylene glycol bis(3-mercaptovalerate), propylene glycol bis(3-mercaptovalerate), diethylene glycol bis(3-mercaptovalerate), butanediol bis(3-mercaptovalerate), octanediol bis(3-mercaptovalerate), trimethylolpropane tris(3-mercaptovalerate), pentaerythritol tetrakis(3-mercaptovalerate), dipentaerythritol hexakis(3-mercaptovalerate), hydrogenated bisphenol A bis(3-mercaptobutyrate), biphenyl Examples of suitable esters include phenol A dihydroxyethyl ether-3-mercaptobutyrate, ethylene glycol bis(3-mercapto-3-phenylpropionate), propylene glycol bis(3-mercapto-3-phenylpropionate), diethylene glycol bis(3-mercapto-3-phenylpropionate), butanediol bis(3-mercapto-3-phenylpropionate), octanediol bis(3-mercapto-3-phenylpropionate), trimethylolpropane tris(3-mercapto-3-phenylpropionate), tris-2-(3-mercapto-3-phenylpropionate)ethyl isocyanurate, pentaerythritol tetrakis(3-mercapto-3-phenylpropionate), and dipentaerythritol hexakis(3-mercapto-3-phenylpropionate). Among these, from the viewpoint of the curability of the resin composition, 1,4-bis(3-mercaptobutyryloxy)butane, pentaerythritol tetrakis(3-mercaptobutyrate), 1,3,5-tris[2-(3-mercaptobutyryloxyethyl)]-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, trimethylolethane tris(3-mercaptobutyrate), trimethylolpropane tris(3-mercaptobutyrate), etc. are preferred. These may be used alone or in combination of two or more.

[0096] The molecular weight of the thiol compound used in the present invention is preferably 200 or more and 1,000 or less.

[0097] The content of the thiol compound in the resin composition of the present invention is preferably 0.05 to 2 parts by mass, and more preferably 0.1 to 1.5 parts by mass, relative to 100 parts by mass of the radically polymerizable compound described below. If the content of the thiol compound is 0.05 part by mass or more, the surface curability when cured in a thin layer is good, and if the content is 2 parts by mass or less, the amount of thiol compound used when curing in a thin layer can be reduced. The thiol compounds may be used alone or in combination of two or more, and a primary thiol compound and a secondary thiol compound may be used in combination.

[0098] [aggregate] The resin composition of the present invention preferably contains an aggregate, which is a component that imparts strength to a coating film obtained from the resin composition and is added as an extender. Examples of aggregates include natural inorganic minerals such as sand, silica sand, river sand, kansui stone, emery, and marble; alumina, slag, glass, ceramic aggregate, pottery, porcelain, tile, glass beads, colored aggregate, calcium carbonate, silica fume, fly ash, talc, clay, titanium oxide, and aluminum hydroxide. One type of aggregate may be used alone, or two or more types may be used in combination. Furthermore, when transparency of the cured product is required, the material may be appropriately selected from natural inorganic ores such as sand, silica sand, river sand, kansui stone, emery, and marble; alumina, slag, glass, ceramic aggregate, pottery, porcelain, tile, glass beads, and colored aggregate.

[0099] The specific surface area of ​​the aggregate is 50 to 25,000 cm 2 / g is preferred, and 100 to 20,000 cm 2 / g is more preferable, and 150 to 15,000 cm 2 / g is more preferable. The specific surface area is a value measured by the Blaine permeability method. The aggregate may be one type having a single specific surface area, or two or more types having different specific surface areas may be used in combination.

[0100] If the specific surface area of ​​the aggregate is equal to or greater than the lower limit, separation between the aggregate and the resin component is less likely to occur, making it easier to ensure a coating thickness and tending to produce a coating with good physical properties such as flexibility. On the other hand, if the specific surface area of ​​the aggregate is equal to or less than the upper limit, separation between the aggregate and the resin component is less likely to occur and the tensile elongation at break of the cured product is higher.

[0101] When an aggregate is blended, the content of the aggregate is preferably 100 to 400 parts by mass, more preferably 100 to 350 parts by mass, and even more preferably 150 to 300 parts by mass, relative to 100 parts by mass of the resin composition of the present invention. If the content of the aggregate is 100 parts by mass or more, sufficient strength can be imparted to the coating film. On the other hand, if the content of the aggregate is 400 parts by mass or less, the coating workability of the resin composition is improved.

[0102] The viscosity of the resin composition of the present invention, measured at 23°C using a Brookfield viscometer, Model BM, according to JIS-Z8803, is 10 to 200 mPa·s, preferably 15 to 150 mPa·s, and more preferably 20 to 100 mPa·s. Within this range, the higher the viscosity, the more effectively it can prevent dripping during coating. Furthermore, within this range, the lower the viscosity, the better the workability during coating.

[0103] The resin composition of the present invention is prepared by blending an aggregate and a curing agent into the resin composition, and the time required for the viscosity of the resin composition at -10°C, measured using a Brookfield viscometer, Model BM, specified in JIS-Z8803, to reach 40,000 mPa·s is 15 to 60 minutes, preferably 20 to 50 minutes, and more preferably 25 to 40 minutes. The longer the time within this range, the more sufficient the time for coating can be. Furthermore, the shorter the time within this range, the shorter the coating time can be.

[0104] The resin composition of the present invention has a flash point of 21°C or higher. A flash point of 21°C or higher reduces the risk of ignition, resulting in a resin composition that is highly safe and has a low odor. The flash point refers to a value measured by the rapid equilibrium closed-pack method described in JIS K2265-2:2007. From the viewpoints of safety and odor reduction, the flash point is preferably 25°C or higher, and more preferably 45°C or higher.

[0105] The resin composition of the present invention preferably has a viscosity of 800 to 5,000 mPa·s when blended with 100 to 400 parts of aggregate per 100 parts of the resin composition, as measured using a Brookfield BM viscometer according to JIS-Z8803. Within this range, the higher the viscosity, the less likely the aggregate will settle when blended into the resin composition, making it easier to coat the resin composition containing the aggregate. Furthermore, within this range, the lower the viscosity, the better the workability during coating.

[0106] When the resin composition containing aggregate and hardener is poured onto a concrete surface to have an adhesive surface of 20 mm x 20 mm and a thickness of 15 mm and cured, the adhesive strength measured in a shear test in which a load is applied to the surface at 23°C to have a size of 15 mm x 20 mm is preferably 0.49 MPa or more, more preferably 0.70 MPa or more, and even more preferably 1.10 MPa or more. Within the above range, the higher the adhesive strength, the more difficult it is for the layer of the cured resin composition to peel off from the substrate, enabling stronger repair.

[0107] The blending of the aggregate and hardener is preferably carried out at −15 to 35° C., more preferably −10 to 35° C. If the blending temperature is within the above range, it becomes possible to repair the cement asphalt mortar layer of a slab track using the resin composition under a wide range of temperature conditions, from room temperature to low temperatures.

[0108] The curing shrinkage calculated by the following formula (1) is preferably 5% or less, more preferably 4% or less, and even more preferably 3% or less, from the density D1 measured by a method conforming to JIS-K5600 2-4 for an aggregate-containing resin composition prepared by blending 100 to 400 parts aggregate with 100 parts of the resin composition of the present invention, and the density D2 calculated from the mass of the cured product of the aggregate-containing resin composition obtained by pouring the aggregate-containing resin composition into a formwork having inner dimensions of 120 mm wide x 120 mm long x 30 mm high, curing, and then cutting out a piece of the aggregate-containing resin composition to a size of 100 mm wide x 100 mm long x 25 mm high. Curing shrinkage rate (%)=[(D2-D1) / D2]×100...Formula (1) In formula (1), "D1" is the density of the liquid resin composition containing aggregate, measured by a method in accordance with JIS K 5600 2-4, and "D2" is the density of the cured resin composition containing aggregate. Within the above range, the lower the cure shrinkage rate, the higher the adhesive strength between the substrate and the layer of the cured product of the resin composition, allowing for stronger repair.

[0109] The surface hardness of the cured product of the resin composition containing the aggregate, measured at 23°C using a Type E durometer specified in JIS-K6253-3, is preferably 80 to 99, more preferably 90 to 99, and even more preferably 95 to 99. Within the above range, the higher the surface hardness, the more difficult it is for the layer of the cured product of the resin composition to peel off from the substrate, allowing for stronger repair.

[0110] The resin composition of the present invention is preferably used by pouring it into a defect in a cement asphalt mortar layer of a slab track when repairing the defect. By pouring the resin composition into the defect, the cured layer of the resin composition has a high adhesive strength between the substrate and the resin composition, due to the low cure shrinkage of the resin composition, allowing for a strong repair.

[0111] The compound having a polymerizable double bond used in the resin composition of the present invention has a solubility parameter of 9.5 (cal / cm 3 ) 1 / 2It is preferable that the monomer contains a solubility parameter of 9.5 (cal / cm 3 ) 1 / 2 By including the above-mentioned monomer, the compatibility of the compound having a polymerizable double bond with the resin composition is improved.

[0112] <Method of manufacturing resin composition> The resin composition of the present invention can be produced, for example, by mixing the above-mentioned components in a commonly used stirrer.

[0113] <Action and effect> The resin composition of the present invention can provide a resin composition that has good adhesive strength and little odor under a wide range of temperature conditions from room temperature to low temperature. Furthermore, the cured product of the resin composition of the present invention has excellent mechanical properties and weather resistance, and can therefore be suitably used as a civil engineering and construction material such as a coating material, a floor coating material, a road surface paving material, a wall material, or a repair filler. Furthermore, by injecting and filling the resin composition of the present invention as a repair material for defective areas in roads, or by using it as a repair material for defects in the cement asphalt mortar layer of railway slab tracks, rapid application is possible under a wide range of temperature conditions from room temperature to low temperatures, and a hardened product with a small cure shrinkage rate can be obtained. Furthermore, the present invention is extremely useful in applications aimed at stabilizing structures, such as repairing road ruts, repairing road defects, correcting road level differences, adjusting the height of railway track slabs, preventing track slabs from being shaken when trains pass, preventing rainwater from entering, and preventing the scattering of cement asphalt mortar that has been crushed by weathering, etc.

[0114] "Laminate" A laminate using the resin composition of the present invention includes a substrate and a coating film formed on the surface of the substrate, the coating film being made of a cured product of the resin composition of the present invention. The laminate can be obtained by applying the resin composition of the present invention to the substrate and curing it to form a cured product.

[0115] Examples of substrates include cement concrete, asphalt concrete, mortar concrete, resin concrete, permeable concrete, ALC (lightweight foamed concrete) boards, PC (precast concrete) boards, asphalt, asphalt concrete, semi-flexible pavement, etc. These may be used alone or in combination as the substrate. The concrete may or may not contain reinforcing bars. The substrate can be used for floors of buildings, platforms, roads, bridges, viaducts and other deck structures. The shape of the substrate is not particularly limited, and may be any shape such as a flat surface, a curved surface, or an inclined surface.

[0116] The thickness of the coating film is not particularly limited and is determined, for example, depending on the function required of the laminate. The coating film can be formed by applying the resin composition of the present invention to a substrate and then curing the applied coating. Examples of coating methods include known coating methods using a roller, metal trowel, brush, adjustable broom, coating machine (spray coating machine, etc.), etc. When using a two-component airless coating machine, it is preferable to separate the two components into a base component and a curing agent component, add a curing accelerator to the base component, and add, for example, an organic peroxide as a curing agent to the curing agent component.

[0117] The temperature during application is preferably -15 to 35°C, more preferably -10 to 35°C. From the viewpoint of workability, the pot life is preferably 15 to 60 minutes, more preferably 15 to 45 minutes. The curing time is preferably 15 to 120 minutes, more preferably 20 to 90 minutes. The pot life and curing time can be adjusted by appropriately adjusting the amounts of the organic peroxide curing agent and curing accelerator used.

[0118] A laminate using the resin composition of the present invention may have a coating film formed on the surface of a substrate, the coating film being a cured product of the resin composition of the present invention. For example, a coating film formed on the surface of a substrate, the cured product of the resin composition of the present invention, may be formed as an undercoat layer, and an intermediate coat layer and a top coat layer may be laminated on the undercoat layer in this order. In addition, the laminate may have only an undercoat layer formed on the surface of the substrate, or only an undercoat layer and a top coat layer formed, or may have two or more layers including an undercoat layer laminated.

[0119] [Method for repairing cement asphalt mortar layers on slab track] The method for repairing a cement asphalt mortar layer of a slab track of the present invention is a method using the resin composition of the present invention, in which the resin composition is injected into the cement asphalt mortar layer of the slab track and then cured.

[0120] The method for injecting the resin composition into the cement asphalt mortar layer of the slab track is not particularly limited, but examples include a method in which a resin composition mixed with a predetermined amount of a hardening accelerator, a hardener, and aggregate is injected into the cement asphalt mortar layer and allowed to harden. Alternatively, various methods of filling and curing may be used, such as adding a curing accelerator and a curing agent to separate resin compositions, mixing aggregate to obtain a two-component resin composition, feeding the composition by a machine or the like, mixing the two components in the feeding path by a line mixer such as a static mixer, filling, and curing. Alternatively, a cylindrical bag made of nonwoven fabric or the like may be placed in advance at the location to be filled, and the one-component or two-component filler composition may be filled into the cylindrical bag and then cured. [Example]

[0121] EXAMPLES The present invention will be specifically explained below with reference to examples and comparative examples, but the present invention is not limited to these examples. In the following examples, all "parts" mean "parts by mass", and all "%" other than those for the degree of saponification and humidity mean "% by mass".

[0122] [Synthesis Example 1: Synthesis of acrylic polymer (P-1)] In a polymerization reactor equipped with a stirrer, condenser, and thermometer, 135 parts of deionized water and 0.4 parts of polyvinyl alcohol (saponification degree 80 mol%, polymerization degree 1,700) as a dispersant were added and stirred. After the polyvinyl alcohol was completely dissolved, stirring was stopped. 40 parts of methyl methacrylate (hereinafter abbreviated as "MMA"), 60 parts of n-butyl methacrylate (hereinafter abbreviated as "n-BMA"), 0.2 parts of 2,2'-azobis-2-methylbutyronitrile (hereinafter abbreviated as "AMBN") as a polymerization initiator, 0.5 parts of n-dodecyl mercaptan (hereinafter abbreviated as "n-DM") as a chain transfer agent, and 0.1 parts of sodium carbonate as an electrolyte were added and stirred again. The mixture was then heated to 75°C and reacted for 2.5 hours. The mixture was then heated to 98°C and maintained at that temperature for 1.5 hours, after which the reaction was terminated. Next, after cooling to 40°C, the resulting aqueous suspension was filtered through a nylon filter cloth with 45 μm openings, and the filtered material was washed with deionized water, dehydrated, and then dried at 40°C for 16 hours to obtain a granular acrylic polymer (P-1). The resulting granular acrylic polymer (P-1) had a glass transition temperature (hereinafter abbreviated as "Tg") of 49°C and a mass average molecular weight of 60,000.

[0123] [Synthesis Example 2: Synthesis of acrylic polymer (P-2)] In the reaction of Synthesis Example 1, the amount of MMA used was changed from 40 parts to 60 parts, the amount of n-BMA used was changed from 60 parts to 40 parts, and the amount of n-DM used was changed from 0.5 parts to 0.2 parts. Except for these, the same procedure was followed as in Synthesis Example 1 to obtain a granular acrylic polymer (P-2) having a Tg of 64°C and a mass average molecular weight of 160,000.

[0124] [Synthesis Example 3: Synthesis of acrylic polymer (P-3)] In the reaction of Synthesis Example 1, the amount of MMA used was changed from 40 parts to 60 parts, the amount of n-BMA used was changed from 60 parts to 40 parts, and the amount of n-DM used was changed from 0.5 parts to 0.8 parts. Except for these, the same procedure was followed as in Synthesis Example 1 to obtain a granular acrylic polymer (P-3) having a Tg of 64°C and a mass average molecular weight of 40,000.

[0125] <Preparation of Resin Composition> [Preparation of Resin Composition (S-1)] Into a 1 L flask equipped with a stirrer, thermometer, and condenser, 50.0 parts of n-BMA (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester B), 10.0 parts of 2-ethylhexyl acrylate (manufactured by Mitsubishi Chemical Corporation, trade name: 2-ethylhexyl acrylate (hereinafter abbreviated as "2-EHA")), and 10.0 parts of 2-hydroxypropyl methacrylate (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester HP (hereinafter abbreviated as "2-HPMA")) as component (A), 5.0 parts of polypropylene glycol dimethacrylate (manufactured by NOF Corporation, trade name: Blenmar PDP-400N (hereinafter abbreviated as "PDP-400N") as component (B), 0.003 parts of 4-methoxyphenol (hereinafter abbreviated as "MEHQ") as a light stabilizer, and alkylsulfonic acid ester of phenol ( 9.0 parts of LANXESS (trade name: Mezamol), 0.5 parts of 3-methacryloxypropyltrimethoxysilane (trade name: KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd.), 0.4 parts of paraffin-115 (Nippon Seiro Co., Ltd., paraffin wax (hereinafter abbreviated as "P-115")) as waxes, and 0.6 parts of paraffin-130 (Nippon Seiro Co., Ltd., paraffin wax (hereinafter abbreviated as "P-130")), 0.5 parts of an antifoaming agent (BYK Japan Co., Ltd., trade name: BYK-1752), 0.5 parts of a wetting and dispersing agent (BYK Japan Co., Ltd., trade name: Disperbyk-2164), and 2.0 parts of N,N-dimethyl-p-toluidine (hereinafter abbreviated as "DMPT") as a curing accelerator were added, and then 16.0 parts of polymer (P-1) as component (b3) was added with stirring. Subsequently, the mixture was heated at 70°C for 2 hours to dissolve the resin. After dissolution was confirmed, the mixture was cooled to obtain a resin composition (S-1). The composition of the obtained resin composition (S-1) is shown in Table 1.

[0126] [Preparation of Resin Compositions (S-2) to (S-23)] Resin compositions (S-2) to (S-23) were obtained in the same manner as for resin composition (S-1), except that the blending compositions were changed to those shown in Tables 1 and 2. The blending compositions of the obtained resin compositions (S-1) to (S-23) are shown in Tables 1 and 2.

[0127] [Rating 1] (viscosity) The viscosity of each resin composition was measured by the following method, and the results are shown in Tables 1 and 2. The viscosity was measured at 23±1° C. and 60 rpm using a Brookfield type viscometer (TVB-10M model, manufactured by Toki Sangyo Co., Ltd.) with a TM1 rotor.

[0128] (flash point) The flash point of each resin composition was measured according to JIS K2265-2:2007 "Determination of flash point - Part 2: Rapid equilibrium closed-circuit method" and evaluated according to the following criteria. The results are shown in Tables 1 and 2. (Evaluation criteria) ○: Flash point 21℃ or higher but less than 70℃ ×: Flash point less than 21°C

[0129] [Table 1]

[0130] [Table 2]

[0131] The abbreviations in Tables 1 and 2 have the following meanings: MMA: Methyl methacrylate (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester M). n-BMA: n-butyl methacrylate (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester B). i-BMA: i-butyl methacrylate (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester IB). 2-EHA: 2-Ethylhexyl acrylate (manufactured by Mitsubishi Chemical Corporation, trade name: 2-ethylhexyl acrylate). BZMA: Benzyl methacrylate (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester BZ). Light Ester PO: Phenoxyethyl methacrylate (manufactured by Kyoeisha Chemical Co., Ltd., trade name: Light Ester PO). 2-HPMA: 2-hydroxypropyl methacrylate (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester HP). PBOM: Polybutylene glycol dimethacrylate (manufactured by Mitsubishi Chemical Corporation, product name: Acryester PBOM). NK Ester APG-400: Polypropylene glycol diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name: NK Ester APG-400). PDP-400N: Polypropylene glycol dimethacrylate (manufactured by NOF Corporation, product name: Blenmar PDP-400N). SUA-017: Urethane acrylate (manufactured by Asia Kogyo Co., Ltd., product name: EXCELATE SUA-017). SUA-008: Urethane acrylate (manufactured by Asia Kogyo Co., Ltd., product name: EXCELATE SUA-008). SUA-015: Urethane acrylate (manufactured by Asia Kogyo Co., Ltd., product name: EXCELATE SUA-015). P-1: MMA / n-BMA=40 / 60 copolymer (Tg=50℃, Mw=60,000). P-2: MMA / n-BMA=60 / 40 copolymer (Tg=64℃, Mw=160,000). P-3: MMA / n-BMA=60 / 40 copolymer (Tg=64℃, Mw=40,000). Mezamol: Alkyl sulfonic acid phenyl ester (manufactured by Shima Trading Co., Ltd., trade name: Mezamol). ·DMPT: N,N-dimethyl-p-toluidine. · PTEO: N,N-di(2-hydroxyethyl)-p-toluidine. Paraffin 115: Paraffin wax (manufactured by Nippon Seiro Co., Ltd., product name: Paraffin 115). Paraffin 130: Paraffin wax (manufactured by Nippon Seiro Co., Ltd., product name: Paraffin 130). Paraffin 150: Paraffin wax (manufactured by Nippon Seiro Co., Ltd., product name: Paraffin 150). · BHT: 2,6-di-t-butyl-4-methylphenol. · MEHQ: 4-Methoxyphenol. KBM-503: 3-methacryloxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM-503). BYK-1752: Defoaming agent (manufactured by BYK Japan, product name: BYK-1752). BYK-2164: Wetting and dispersing agent (manufactured by BYK Japan, product name: Disperbyk-2164).

[0132] <Performance evaluation> Resin compositions were prepared as follows, and the viscosity, working life, adhesive strength, cure shrinkage, and hardness of the blends were measured or evaluated. The results are shown in Tables 3 and 4.

[0133] Example 1 [Rating 2] (compound viscosity) Resin composition S-1 and calcium carbonate G-100 (manufactured by Sankyo Seifun Co., Ltd., product name: sandy calcium carbonate G-100 (hereinafter referred to as "calcium carbonate G-100")) as aggregate were cured at -10°C for at least 4 hours, and it was confirmed that the temperatures of the resin composition and calcium carbonate G-100 were -10°C. In a −10° C. environment, 400 g of resin composition S-1 was placed in a 1 L container, and while stirring at 1,500 rpm with a homodisper, 880 g of calcium carbonate G-100 was added, followed by stirring for 3 minutes. Next, 48 g of a curing agent, Perkadox 33 (manufactured by Kayaku Nouryon, trade name: Perkadox 33 (purity of benzoyl peroxide 33%) (hereinafter abbreviated as "Perkadox 33")) was added, and the mixture was stirred for another minute. Immediately after the stirring of Perkadox 33 was completed, the viscosity of the blend was measured using a Brookfield viscometer in an environment of −10° C., and the viscosity measured 3 minutes after the addition of Perkadox 33 was recorded as the viscosity of the blend. In addition, for those in which the aggregate settled immediately after mixing, the viscosity could not be measured accurately, and they were evaluated as "immeasurable."

[0134] (Pot life) Resin composition S-1 and calcium carbonate G-100 as aggregate (manufactured by Sankyo Seifun Co., Ltd., trade name: sandy calcium carbonate G-100 (hereinafter abbreviated as "calcium carbonate G-100"), specific surface area: 1,000 cm 2 / g) was cured at -10°C for at least 4 hours, and it was confirmed that the temperatures of the resin composition and calcium carbonate G-100 were -10°C. In a −10° C. environment, 400 g of resin composition S-1 was placed in a 1 L container, and while stirring at 1,500 rpm with a homodisper, 880 g of calcium carbonate G-100 was added, followed by stirring for 3 minutes. Next, 48 g of a curing agent, Perkadox 33 (manufactured by Kayaku Nouryon, trade name: Perkadox 33 (purity of benzoyl peroxide 33%) (hereinafter abbreviated as "Perkadox 33")) was added, and the mixture was stirred for another minute. Immediately after the Perkadox 33 was mixed, the viscosity of the compound was measured using a Brookfield viscometer in a -10°C environment. The viscosity was measured every minute after the Perkadox 33 was added, and the time required for the viscosity of the compound to reach 40,000 mPa·s was recorded as the pot life. In addition, for those in which the aggregate settled immediately after mixing, the viscosity could not be measured accurately, and they were evaluated as "immeasurable."

[0135] (adhesive strength) In order to use a shear method in which load is applied to the hardened material cast and bonded to the concrete surface, a 50mm x 50mm x 25mm thick concrete plate was used as the base material, and a 20mm x 20mm x 15mm high formwork was made in which the resin composition mixture could be poured into the center of the 50mm x 50mm. The concrete base material with formwork, resin composition S-1, and calcium carbonate G-100 are cured at -10°C for at least 4 hours, and the temperatures of the concrete base material, resin composition, and calcium carbonate G-100 are confirmed to be -10°C. In a −10° C. environment, 400 g of resin composition S-1 was placed in a 1 L container, and while stirring at 1,500 rpm with a homodisper, 880 g of calcium carbonate G-100 was added, followed by stirring for 3 minutes. Next, 48 g of a curing agent, Perkadox 33 (manufactured by Kayaku Nouryon, trade name: Perkadox 33 (purity of benzoyl peroxide 33%) (hereinafter abbreviated as "Perkadox 33")) was added, and the mixture was stirred for another minute. After mixing the Perkadox 33, the mixture was immediately poured into a formwork set up in a concrete substrate in an environment of -10°C. After curing for at least 24 hours at -10°C, and then curing for at least 24 hours at 23°C, 50% RH, the formwork was removed, and the 20mm x 15mm surface where the resin composition mixture had hardened was used as the loading surface. The test piece was fixed to a materials testing machine so that a test force was applied perpendicularly and evenly to the loading surface, and loaded using the materials testing machine at a testing speed of 1mm / min. The maximum load until the adhesive bonded joint peeled was measured, and the adhesive strength was calculated using the following equation (7).

[0136] σ=F / S...Equation (7) σ: adhesive strength (MPa), F: maximum load (N), S: adhesive area (20mm x 20mm) In addition, in the case of the aggregates settling immediately after mixing, the bond strength could not be measured accurately, and therefore it was evaluated as "impossible to measure." When the adhesive strength test was carried out, if the measured value was too low and peeling occurred between the substrate and the resin composition blend, it was evaluated as "peeling."

[0137] [Rating 3] (Cure shrinkage rate) The resin composition S-1 and calcium carbonate G-100 were cured at 23°C for 4 hours or more, and it was confirmed that the temperatures of the resin composition and calcium carbonate G-100 were 23°C. In a 23°C environment, 200 g of resin composition S-1 was placed in a 1 L container, and while stirring at 1,500 rpm with a homodisper, 440 g of calcium carbonate G-100 was added, followed by stirring for 3 minutes. The resin composition blend was placed in a metal pycnometer (specific gravity cup: 100 mL) specified in JIS K 5600 2-4 "General test methods for paints - Property stability of paints - Density," and after removing any air bubbles contained therein, the liquid density D1 of the resin composition blend was measured. In a 5°C environment, 400 g of resin composition S-1 was placed in a 1 L container, and while stirring at 1,500 rpm with a homodisper, 880 g of calcium carbonate G-100 was added, and the mixture was stirred for 3 minutes. Next, 10 g of a curing agent, Perkadox 33 (manufactured by Kayaku Nouryon, trade name: Perkadox 33 (purity of benzoyl peroxide 33%) (hereinafter abbreviated as "Perkadox 33")) was added, and the mixture was stirred for another minute. After stirring the Perkadox 33, the mixture was immediately placed in a 120mm x 120mm x 30mm mold in a 5°C environment, and cured for at least 24 hours at 5°C, followed by curing for at least 24 hours at 23°C, 50% RH. The mold was then removed, and the center of the cured resin composition mixture was molded into a 100mm x 100mm x 25mm shape. After curing for at least 24 hours at 23°C, 50% RH, the mass was measured and the density D2 was calculated. The cure shrinkage of the resin composition mixture was calculated from densities D1 and D2 using the following equation (1).

[0138] Curing shrinkage rate (%)=[(D2-D1) / D2]×100...Formula (1) In addition, for those in which the aggregate settled immediately after mixing, the hardening shrinkage could not be measured accurately, and they were evaluated as "measurable."

[0139] (hardness) The cured resin composition was molded into a shape of 100 mm x 100 mm x 25 mm and used as a test specimen. After curing at 23°C and 50% RH for 24 hours or more, the surface hardness of the cured resin composition was measured at 5 points at 23°C using a Type E durometer specified in JIS-K6253-3, and the average of the measured values ​​was taken as the hardness. In addition, for those in which the aggregate settled immediately after mixing, the hardness could not be measured accurately, and they were evaluated as "immeasurable."

[0140] (Examples 2 to 18 and Comparative Examples 1 to 9) Evaluations were carried out in the same manner as in Example 1, except that the type of resin composition and the amount of calcium carbonate G-100 added were changed as shown in Tables 3 and 4. The results are shown in Tables 3 and 4.

[0141] [Table 3]

[0142] [Table 4]

[0143] (Examples 19 and 20, Comparative Example 10) [Rating 4] Evaluation was carried out in the same manner as in Example 1, except that the type and amount of aggregate added were changed as shown in Table 5. The results are shown in Table 5.

[0144] [Rating 5] Evaluation was carried out in the same manner as in Example 1, except that the type and amount of aggregate added were changed as shown in Table 5. The results are shown in Table 5. The abbreviations in Table 5 have the following meanings: Calcium Carbonate Escalon 2000: Sankyo Seifun Co., Ltd., product name: Heavy Calcium Carbonate Escalon 2000 (hereinafter referred to as "Calcium Carbonate Escalon 2000"); specific surface area: 22,000 cm 2 / g. KM-17A: manufactured by Ryokosha, product name: Acrytone Floor KM-17A (hereinafter abbreviated as "KM-17A"), specific surface area: 200 cm 2 / g. KZ-005: Manufactured by Ryokosha, product name: Acrytone Floor KZ-005 (hereinafter referred to as "KZ-005"), specific surface area: 40 cm 2 / g.

[0145] [Table 5]

[0146] (Example 21 and Example 22) [Rating 6] Evaluations were carried out in the same manner as in Example 4, except that the temperature at which the samples were blended was changed from -10°C in Evaluation 1 to 35°C and -15°C, and the blending was changed as shown in Table 6. The results are shown in Table 6. The abbreviations in Table 6 have the following meanings: XD-631: Reaction adjuster manufactured by Ryoko Co., Ltd., trade name: Acrysirup XD-631 (hereinafter abbreviated as "XD-631").

[0147] [Table 6]

[0148] As shown in Tables 1 to 6, Resin Compositions S-1 to S-16 of the present invention and Examples 1 to 22 had resin viscosities within a preferred range, resulting in good coating workability, good flash points, compound properties, and adhesive strength, and could be cured in a short time under a wide range of temperature conditions from 35°C to -15°C. They also had good adhesive strength, high flash points, and low odor.

[0149] In contrast, as shown in Table 2, resin composition S-17 satisfied the flash point requirement, but had a high resin viscosity and poor coating workability, and as shown in Table 4, comparative example 1, which used resin composition S-17, had a high blend viscosity and poor coating workability, and the adhesive strength and hardness were poor. Although resin composition S-18 satisfied the flash point requirement, the resin viscosity was high and coating workability was poor. As shown in Table 4, in Comparative Example 2, in which resin composition S-18 was used, the compound viscosity was high and coating workability was poor, and the adhesive strength was also poor. Although resin composition S-19 satisfied the flash point requirement, the resin viscosity was high and coating workability was poor. As shown in Table 4, in Comparative Example 3 in which resin composition S-19 was used, the compound viscosity was high and coating workability was poor, and the adhesive strength was also poor. Although resin composition S-20 satisfied the flash point requirement, the resin viscosity was high and coating workability was poor. As shown in Table 4, in Comparative Example 4, in which resin composition S-20 was used, the viscosity of the blend was high and coating workability was poor, and the adhesive strength was also poor, with peeling occurring between the substrate and the blended layer of the resin composition. Although resin composition S-21 satisfied the flash point requirement, the resin viscosity was too low, resulting in poor coating workability. As shown in Table 4, in Comparative Example 5, in which resin composition S-21 was used, the viscosity of the compound was also too low, causing the aggregate components of the resin composition to settle and separate, resulting in poor storage stability of the resin composition, and making it impossible to properly evaluate the usable time, adhesive strength, cure shrinkage, and hardness. Resin composition S-22 contained a large amount of MMA, which has a low flash point, and therefore had a poor flash point and high resin viscosity, resulting in poor coating workability. As shown in Table 4, Comparative Example 6, which used resin composition S-22, also had a high blend viscosity and poor coating workability. Resin composition S-23 contained a large amount of MMA, which has a low flash point, and therefore had a poor flash point. As shown in Table 4, Comparative Example 7, which used resin composition S-23, had good blend properties, adhesive strength, cure shrinkage, and hardness, but was a highly flammable composition. In Comparative Example 8, which used Resin Composition S-4, the amount of calcium carbonate G-100 aggregate was small, resulting in low viscosity of the compound and poor coating workability. The pot life was also long, resulting in poor adhesive strength and separation. Furthermore, the cure shrinkage and hardness could not be accurately evaluated. Comparative Example 9, which used resin composition S-9, contained a large amount of calcium carbonate G-100 as an aggregate, which resulted in high viscosity of the compound, poor coating workability, and a long usable life, resulting in poor adhesive strength and separation. Furthermore, the cure shrinkage and hardness could not be evaluated correctly. [Industrial Applicability]

[0150] The resin composition of the present invention can be cured in a short time under a wide range of conditions, from room temperature to low temperature, and has good adhesive strength and low odor, and can provide a method for repairing a cement asphalt mortar layer of a slab track using the same. Therefore, the resin composition of the present invention and the method for repairing a cement asphalt mortar layer of a slab track using the same can be suitably used in the fields of civil engineering and construction materials such as covering materials, floor coating materials, road surface paving materials, wall materials, and repair fillers, and are therefore extremely important industrially.

Claims

1. A resin composition containing a compound having a polymerizable double bond, the compound having a polymerizable double bond is a compound having a (meth)acryloyl group and an alkyl group or a substituted alkyl group having 3 to 17 carbon atoms, a monomer (A) having one (meth)acryloyl group (hereinafter referred to as component (A)) containing one or more selected from the following monomers (a1) to (a3): one or more compounds (B) selected from the group consisting of a monomer having two or more (meth)acryloyl groups, a urethane (meth)acrylate, an epoxy (meth)acrylate, a polyester (meth)acrylate, and an acrylic polymer having a polymerizable double bond and containing, as a copolymerization component, 15% by mass or more of a compound having an alkyl group having 2 to 18 carbon atoms and a (meth)acryloyl group (hereinafter referred to as component (B)); a resin composition having a flash point of 21°C or higher, and an aggregate-containing resin composition comprising an aggregate. The resin composition contains 55 to 85 parts by mass of the component (A), 15 to 35 parts by mass of the component (B), and 0 to 15 parts by mass of the component (C) relative to 100 parts by mass in total of the component (A), the component (B), and an optional plasticizer (C) {hereinafter, referred to as the component (C)}; The resin composition containing aggregate contains 100 to 400 parts by mass of aggregate per 100 parts by mass of the resin composition. The specific surface area of ​​the aggregate is 50 to 25,000 cm ２ / g. The monomer (a1) is a (meth)acrylate monomer having a (meth)acryloyl group and an alkyl group or a substituted alkyl group having 4 to 13 carbon atoms; The above monomer (a2) has a solubility parameter of 9.5 (cal / cm ３ ) １／２ The above (meth)acrylate monomers, the monomer (a3) ​​is a monomer having one (meth)acryloyl group other than the monomer (a1) and the monomer (a2), The amount of the monomer (a3) ​​is 0 to 15 parts by mass per 100 parts by mass of the total of the components (A), (B), and (C). The resin composition has a viscosity of 10 to 200 mPa s at 23°C, and when an aggregate blend composition containing 220 parts by mass of calcium carbonate G-100 (manufactured by Sankyo Seifun Co., Ltd., product name: Sandy Carbonate G-100) as an aggregate per 100 parts by mass of the resin composition is adjusted to -10°C, and then 12 parts by mass (3.96 parts by mass as benzoyl peroxide) of Perkadox 33 (manufactured by Nouryon Chemical Co., Ltd., product name: Perkadox 33, benzoyl peroxide purity 33%) as a curing agent is blended, the time required for the viscosity at -10°C to reach 40,000 mPa s is 15 to 60 minutes. The viscosity refers to the viscosity measured using a Brookfield viscometer, model BM, specified in JIS-Z8803.

2. 2. The resin composition containing aggregate according to claim 1, wherein 220 parts by mass of calcium carbonate G-100 is blended with the resin composition as an aggregate relative to 100 parts by mass of the resin composition, and 12 parts by mass (3.96 parts by mass as benzoyl peroxide) of Perkadox 33 (manufactured by Nouryon Chemical Industries, Ltd., trade name: Perkadox 33, benzoyl peroxide purity 33%) of the curing agent is blended with the resin composition relative to 100 parts by mass of the resin composition, and the viscosity at −10° C. measured after 3 minutes using a Brookfield viscometer BM type specified in JIS-Z8803 is 800 to 5,000 mPa s.

3. 3. The resin composition containing aggregate according to claim 1 or 2, wherein 220 parts by mass of calcium carbonate G-100 is blended with 100 parts by mass of the resin composition as an aggregate, and 12 parts by mass (3.96 parts by mass as benzoyl peroxide) of Perkadox 33 (manufactured by Nouryon Chemical Co., Ltd., trade name: Perkadox 33, benzoyl peroxide purity 33%) is blended with 100 parts by mass of the resin composition, and when the resin composition is poured onto a concrete surface so that the bonding surface is 20 mm x 20 mm and the thickness is 15 mm and cured, the adhesive strength measured in a shear test in which a load is applied so that the loading surface is 15 mm x 20 mm at 23°C is 0.49 MPa or more.

4. The resin composition containing aggregate according to any one of claims 1 to 3, wherein the aggregate and the curing agent are mixed at -15 to 35°C.

5. 5. The aggregate-containing resin composition according to claim 1, wherein the curing shrinkage is 5% or less, as calculated by the following formula (1) from: a density D1 of an aggregate-containing resin composition, in which 220 parts by mass of the calcium carbonate G-100 as an aggregate per 100 parts by mass of the resin composition, measured according to a method in accordance with JIS-K5600 2-4; and a density D2 of a sample of the aggregate-containing resin composition, which is obtained by pouring the aggregate-containing resin composition into a formwork having inner dimensions of 120 mm in width, 120 mm in length, and 30 mm in height in an environment of 5°C, allowing it to harden and cure, and then cutting out a piece of the aggregate-containing resin composition to a size of 100 mm in width, 100 mm in length, and 25 mm in height, and curing the piece in an environment of 23°C and 50% RH for 24 hours or more. Curing shrinkage rate (%) = [(D2-D1) / D2] x 100...Formula (1)

6. 6. The resin composition containing aggregate according to claim 1, wherein 220 parts by mass of calcium carbonate G-100 is blended as the aggregate relative to 100 parts by mass of the resin composition, and 5 parts by mass (1.65 parts by mass as benzoyl peroxide) of Perkadox 33 (trade name: Perkadox 33 (benzoyl peroxide purity 33%), manufactured by Nouryon Chemical Industries, Ltd.) is blended as the curing agent relative to 100 parts by mass of the resin composition in an environment of 5°C, and the cured product has a surface hardness of 80 to 99 at 23°C as measured with a Type E durometer specified in JIS-K6253-3.

7. The resin composition containing aggregate according to any one of claims 1 to 6, which is used to pour into a defect in a cement asphalt mortar layer of a slab track when repairing the defect.

8. The resin composition containing aggregate according to any one of claims 1 to 7, wherein the compound having a polymerizable double bond has a (meth)acryloyl group and an alkyl group or substituted alkyl group having 3 to 13 carbon atoms.

9. The aggregate-containing resin composition according to any one of claims 1 to 8, further comprising a (meth)acrylic polymer.

10. The compound having a polymerizable double bond has a solubility parameter of 9.5 (cal / cm ３ ) １／２ The resin composition containing aggregate according to any one of claims 1 to 9, wherein the monomer is any one of the above.

11. A method for repairing a cement asphalt mortar layer of a slab track, comprising injecting the aggregate-containing resin composition according to any one of claims 1 to 10 into the cement asphalt mortar layer of the slab track and then curing the resin composition.

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