JP2022131805A - Resin composition and repair method using the same - Google Patents

Abstract

To provide a resin composition which can be cured under a wide temperature condition from normal temperature to low temperature in short time, 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: A resin composition has viscosity at 23°C measured by BM type Brookfield type viscometer according to JIS Z 8803 of 10-200 mPa s, where an aggregate and a curing agent are blended with the resin composition, time necessary for the viscosity of the resin composition at -10°C measured by the BM type Brookfield type viscometer according to JIS Z 8803 to reach 40,000 mPa s is 15-60 minutes, and a flash point of the resin composition is 21°C or higher.SELECTED DRAWING: None

Description

The present invention relates to a resin composition and a repair method using the same.

Conventionally, unsaturated polyester-based resins, epoxy-based resins, polyurethane-based resins, and the like have been used as coating agents for forming coating films on substrates such as floor surfaces, wall surfaces, pavement surfaces of roads, and the like.
In general, unsaturated polyester resins are excellent in solvent resistance, but have poor weather resistance, large shrinkage during curing, and poor low-temperature workability.
Epoxy-based resins have excellent alkali resistance and excellent adhesion to substrates, but have poor weather resistance, long curing times, and poor low-temperature curability.
Polyurethane-based resins are excellent in elasticity and flexibility, but are inferior in chemical resistance and weather resistance.
Vinyl ester resins and acrylic resins, which are excellent in low-temperature curing properties, weather resistance, and chemical resistance, are often used as coating agents.
Vinyl ester resins and acrylic resins have a specific odor caused by low-molecular-weight monomers such as styrene and methyl methacrylate, and thus odor during work poses a problem.

The above-mentioned resin materials have been used in various ways as coating agents for forming coating films on substrates such as floor surfaces, wall surfaces, and pavement surfaces of roads. Methods, methods of backfilling and filling defects, etc. have also been proposed.

Acrylic curable resin compositions containing low-molecular-weight monomers such as methyl methacrylate are known to have a short curing time, excellent low-temperature curability, and excellent weather resistance and chemical resistance. However, when using the acrylic curable composition as a repair material, if the base material is asphalt, asphalt mixture such as asphalt concrete, it is not necessary to apply a primer to improve the adhesion between the base material and the repair material. there is a case When concrete is used as the base material, there are cases in which adhesion to materials mixed with aggregate or the like is insufficient unless a primer is applied.
In recent years, there has been a growing interest in environmental issues, and resin compositions containing low-molecular-weight monomers such as styrene and methyl methacrylate are highly volatile and contain strong-smelling components, and are generally flammable. The main component is methyl methacrylate, which is highly flammable, and there is a risk of fire due to ignition, so there is a tendency to refrain from using it.

In Patent Document 1, methyl methacrylate is the main component, and a cured body with a small shrinkage rate during curing, excellent filling properties, and good properties and workability as a filling material is obtained. It is described that it can be used as a repair material for defects in the cement asphalt mortar layer of slab tracks, etc., and can be rapidly applied under a wide range of temperature conditions from normal temperature to low temperature, and a cured product with a small curing shrinkage can be obtained.
In the method described in Patent Document 1, although it is possible to cure from room temperature to low temperature in a short time, adhesiveness in curing at low temperature is not considered, and methyl methacrylate with a low flash point is used as a main component. There is room for further improvement in terms of adhesiveness and safety, such as the low flash point of the resin liquid due to the heat.

Patent Document 2 discloses that the resin filled in the repair work does not leak out of the gap and sufficiently hardens in the gap, so that the members facing each other across the gap can be joined. is described.
The method described in Patent Document 2 does not allow rapid construction from room temperature to low temperature, and there is no description of flash point, so there is a problem that the safety aspect is somewhat insufficient.

Patent Document 3 describes that it is possible to provide a radically polymerizable resin composition that has low-temperature curability and exhibits excellent adhesive strength.
The method described in Patent Document 3 cannot be used in an environment below 0 ° C in winter, and a monomer with a low flash point is used in the resin composition, so the safety aspect is somewhat insufficient. had the problem of

JP 2015-98527 A JP 2019-183625 A WO2019/004125

The present invention has been made to solve the above problems, and is capable of curing in a short time under a wide range of temperature conditions from normal temperature to low temperature, and has good adhesive strength and low odor. The object is to provide a repair method for the cement asphalt mortar layer of the used slab track.

That is, the gist of the present invention is the following [1] to [14].
[1] The resin composition has a viscosity of 10 to 200 mPa s at 23° C. measured by a Brookfield viscometer BM type specified in JIS-Z8803, and the resin composition is mixed with an aggregate and a curing agent. , The time required for the viscosity of the resin composition to reach 40,000 mPa s at -10 ° C. measured with a Brookfield type viscometer BM type specified in JIS-Z8803 is 15 to 60 minutes, and the resin composition A resin composition having a flash point of 21°C or higher.
[2] When 100 to 400 parts of aggregate is blended with 100 parts of the resin composition, the resin composition has a viscosity of 800 to 5,000 mPa s measured with a Brookfield viscometer BM type specified in JIS-Z8803. The resin composition according to [1].
[3] When the resin composition containing the aggregate and the curing agent is cast and cured on a concrete surface so that the adhesive surface is 20 mm × 20 mm and the thickness is 15 mm, the loading surface at 23 ° C. is 15 mm. The resin composition according to [1] or [2], which has an adhesive strength of 0.49 MPa or more as measured by a shear test with a load of 20 mm.
[4] The resin composition according to any one of [1] to [3], wherein the aggregate and curing agent are blended at -15 to 35°C.
[5] Density D1 of an aggregate-containing resin composition in which 100 to 400 parts of aggregate is blended with respect to 100 parts of the resin composition, measured by a method in accordance with JIS-K5600 2-4, and the bone After pouring the resin composition containing the material into a mold with inner dimensions of 120 mm in width × 120 mm in length × 30 mm in height and curing and curing, the aggregate containing the material is cut into a size of 100 mm in width × 100 mm in length × 25 mm in height. According to any one of [1] to [4], the curing shrinkage calculated by the following formula (1) from the density D2 calculated from the mass of the cured product of the resin composition is 5% or less. of the resin composition.
Cure shrinkage rate (%) = [(D2-D1) / D2] × 100 Equation (1)
In the formula (1), "D1" is the density of the liquid aggregate-containing resin composition measured by a method conforming to JIS K 5600 2-4, and "D2" is the density of the aggregate-containing resin composition. It is the density of the cured product.
[6] The surface hardness of the cured product of the aggregate-containing resin composition is 80 to 99 at 23 ° C. measured with a type E durometer specified in JIS-K6253-3 [1] to [5] ] The resin composition as described in any one of ].
[7] The resin composition according to any one of [1] to [6], which contains a compound having a polymerizable double bond.
[8] The resin composition according to any one of [1] to [7], which is used for pouring into the defective portion when repairing the defective portion of the cement asphalt mortar layer of the slab track.
[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 substituted alkyl group having 3 to 17 carbon atoms.
[10] The compound having a polymerizable double bond according to any one of [7] to [9], which has a (meth)acryloyl group and an alkyl group or substituted alkyl group having 3 to 13 carbon atoms. Resin composition.
[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] Any one of [7] to [12], wherein the compound having a polymerizable double bond contains a monomer having a solubility parameter of 9.5 (cal/cm ³ ) ^1/2 or more. of the resin composition.
[14] A method for repairing a cement asphalt mortar layer of a slab track by injecting the resin composition according to any one of [1] to [13] into the cement asphalt mortar layer of the slab track and then curing the same.

INDUSTRIAL APPLICABILITY According to the present invention, 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 low odor, and a method for repairing a cement asphalt mortar layer on a slab track using the same. can provide.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail.
In the present invention, "(meth)acryl" is a generic term for acryl and methacryl. "(Meth)acrylate" is a generic term for acrylate and methacrylate. A "(meth)acryloyl group" is a generic term for an acryloyl group and a methacryloyl group, and has the general formula CH ₂ =C(R)-C(=O)-[R represents a hydrogen atom or a methyl group. ]. "Acrylic" is a general term for acrylic and methacrylic.

As components constituting the resin composition of the present invention, components (A) and (B), and optionally component (C) and other additive components can be used.

<(A) Component>
The component (A) may include the monomer (A). Monomer (A) means a monomer having one (meth)acryloyl group. The monomer (A) is a component capable of adjusting the viscosity of the resin composition and adjusting the mechanical strength and the like of the cured coating film formed from the resin composition.
Examples of the monomer (A) include the following monomers (a1) to (a3). Among these, at least one of (a1) should be blended in that the viscosity of the resin composition can be easily adjusted and the mechanical strength of the adhesive protective layer formed from the resin composition can be easily adjusted. is preferred.
Monomer (a1): A compound having a polymerizable double bond is a (meth)acrylate monomer having 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 is a (meth)acrylate monomer whose solubility parameter is 9.5 (cal/cm ³ ) ^1/2 or more.
Monomer (a3): A monomer (A) other than the monomer (a1) and the monomer (a2).

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, and 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 repeating ethylene glycol is 6 or less ), polypropylene glycol mono (meth) acrylate (repeating number of polypropylene glycol is 4 or less), glycidyl group-containing methacrylates such as glycidyl methacrylate; trifluoroethyl (meth) acrylate, tetrafluoroethyl (meth) acrylate, hexafluoroethyl (meth) ) fluorine atom-containing (meth)acrylates such as acrylates 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; Furan rings such as furyl (meth)acrylate, furfuryl (meth)acrylate, tetrahydrofuryl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, caprolactone-modified tetrahydrofurfuryl (meth)acrylate, etc. (meth) acrylates having a pyran ring; (meth) acrylates having a pyran ring include (meth) acrylates having a pyran ring such as pyranyl (meth) acrylate; dihydropyranyl (meth) acrylate, tetrahydropyranyl (meth) acrylate, Examples include (meth)acrylates having a hydropyran ring such as dimethyldihydropyranyl (meth)acrylate and dimethyltetrahydropyranyl (meth)acrylate. can be lifted.
Among them, from the viewpoint of the mechanical properties of the cured product, an alkyl group having 4 carbon atoms and a (meth)acryloyl group-n-butyl (meth)acrylate, i-butyl (meth)acrylate, (meth) ) 2-ethoxylated 2-ethylhexyl (meth)acrylate, polyethylene glycol monomethyl ether, preferably containing t-butyl acrylate as a main component, having an alkyl group having 5 to 13 carbon atoms and an acryloyl group (meth) (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 ) acrylate and tridecyl (meth)acrylate are more preferably used in combination.

The solubility parameter (hereinafter abbreviated as SP value) of the monomer (a2) is described in Polymerengineering and Science, Vol. 14 by Robert F. Fedors et al. means a value calculated by the method
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 ), phenoxypolyethylene glycol (meth)acrylate, nonylphenoxypolyethyleneglycol (meth)acrylate, phenoxypolypropyleneglycol (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, 2-(meth)acryloyloxyethyl phthalate, 2-(meth)acryloyloxyethyl hexahydrophthalate, etc. 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 (SP 12.1 (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 ), acetoacetoxy ethyl meta Examples include acrylate (SP value 11.2 (cal/cm ³ ) ^1/2 ), hydroxyalkyl (meth)acrylate such as glycerin (meth)acrylate, 2-(meth)acryloyloxyethyl succinic acid 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, Acetoacetoxyethyl methacrylate is preferred, and benzyl (meth)acrylate, cyclohexyl (meth)acrylate, phenoxyethyl (meth)acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl (meth)acrylate are more preferred.
When the (b2) component described later is included, the total content of the monomer (a2) is 2 parts by mass or more out of the total 100 parts by mass of the components (A), (B) and (C). is preferred. By containing 2 parts by mass or more, the compatibility with the components (A), (B) and (C) can be improved.
The total content of the monomer (a1) and the monomer (a2) is 55 to 85 parts by mass out of the total 100 parts by mass of the components (A), (B) and (C). is preferred.
At this time, the monomer (a1) whose homopolymer glass transition temperature (hereinafter abbreviated as Tg) is 0° C. or lower and the monomer (a2) whose homopolymer Tg is 0° C. or lower were added together. The content is less than 40 parts by mass out of 100 parts by mass in total of the components (A), (B) and (C), and the monomer (a1) and the monomer (a2) is more preferably 55 to 85 parts by mass in the total 100 parts by mass of components (A), (B) and (C).

The resin composition of the present invention may contain a monomer (a3) other than the monomer (a1) and the monomer (a2) as long as the flash point, odor and the like 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 ( ethylene glycol having a repeating number of 7 or more), polypropylene glycol mono(meth)acrylate (a polypropylene glycol having a repeating number of 5 or more), and the like.
The content of the monomer (a3) is preferably 0 to 15 parts by mass based on the total of 100 parts by mass of the components (A), (B) and (C).

The content of the monomer (A) is preferably 55 to 85 parts by mass, more preferably 60 to 85 parts by mass, based on the total of 100 parts by mass of components (A), (B) and (C). When the amount of the monomer (A) is 55 parts by mass or more, the viscosity of the resin composition does not become too high and the workability is improved. When the amount of monomer (A) is 85 parts by mass or less, the viscosity of the resin composition does not become too low, and unintended outflow of the resin composition during operation can be moderately suppressed.
The component (A) may be used alone or in combination of two or more.

<(B) Component>
The (B) component used in the resin composition of the present invention includes a monomer having two or more (meth)acryloyl groups, urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate, and a copolymer component. is one or more compounds selected from acrylic polymers having a polymerizable double bond 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 the component (B), the following components (b1), (B2) and (b3) can be used.

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

Component (b1) includes ethylene glycol di(meth)acrylate, 1,3-propylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, and 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) Acrylates, polybutylene glycol di(meth)acrylate, 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, tricyclodecanedimethanol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, tris( 2-(meth)acryloyloxyethyl)isocyanurate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and the like. 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) ) acrylates and the like.

The content of component (b1) is preferably from 0 to 20 parts by mass, more preferably from 0 to 15 parts by mass, based on a total of 100 parts by mass of components (A), (B) and (C). If the content of component (b1) is 20 parts by mass or less, the curing time does not become too short, coating workability is improved, and the toughness of the cured product is improved.

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

A urethane (meth)acrylate can be obtained, for example, by reacting a polyol, a polyisocyanate, and a hydroxyl group-containing (meth)acrylate. A polyol used for synthesizing 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; dihydric phenols such as bisphenol A, bisphenol F and bisphenol S; and alkylene oxides such as ethylene oxide and propylene oxide. addition reaction products with; Polyhydric alcohols such as ethylene glycol, propylene glycol, butanediol, butylene glycol, methylpentanediol, phthalic acid, isophthalic acid, tetrahydrophthalic acid, succinic acid, maleic acid, fumaric acid, adipine Polyester polyols obtained by reaction with acids, polybasic acids such as sebacic acid and trimellitic acid, and their anhydrides; Polylactone diols obtained from alkylene glycol and lactone; butanediol, pentanediol, hexanediol, heptane Polycarbonate diols having a carbonate bond obtained by reacting a diol such as diol, octanediol, nonanediol and cyclohexanedimethanol with a carbonate agent such as phosgene and dimethyl carbonate. These polyols may be used individually by 1 type, and may use 2 or more types together.

Among these polyols, polycarbonate diols are preferred from the viewpoint of curability, and polycarbonate diols synthesized using butanediol, pentanediol, or hexanediol are more preferred. Moreover, polybutylene glycol is preferable from the viewpoint of the mechanical properties (elongation at break) of the cured product at a low temperature.

Polyisocyanate used for synthesizing urethane (meth)acrylate is a compound having two or more isocyanate groups in one molecule. Examples of the polyisocyanate include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, hexamethylene diisocyanate, and tetramethylene. diisocyanate, phenylene diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, isophorone diisocyanate and the like. In addition, adduct compounds of these compounds with water, trimethylolpropane, and the like, trimer cyclization compounds, and the like can also be used as polyisocyanates. These polyisocyanates may be used individually by 1 type, and may use 2 or more types together.

Hydroxyl group-containing (meth)acrylates used for synthesizing urethane (meth)acrylates include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxy butyl (meth)acrylate; adducts of ε-caprolactone and 2-hydroxyethyl (meth)acrylate; These hydroxyl group-containing (meth)acrylates may be used alone or in combination of two or more.

Also, 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, and glycerin monoallyl. ether, glycerin diallyl ether, trimethylolpropane monoallyl ether, trimethylolpropane diallyl ether, pentaerythritol monoallyl ether, pentaerythritol diallyl ether, pentaerythritol triallyl ether and the like.

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

Polyester (meth)acrylate can be obtained, for example, by reacting a polybasic acid or its anhydride, 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, and adipic acid. Examples of polybasic acid anhydrides include anhydrides of the above polybasic acids. . Examples of polyhydric alcohols include ethylene glycol and propylene glycol.

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

The amount of component (b2) used is preferably 0 to 35 parts by mass, more preferably 0 to 30 parts by mass, based on a total of 100 parts by mass of components (A), (B) and (C).

<(b3) Component>
The component (b3) is a component capable of improving 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, more preferably 40% by mass or more, of structural units derived from methyl methacrylate.
If the constituent unit derived from methyl methacrylate as the component (b3) is less than 15% by mass, the strength of the coating film may be impaired.

Component (b3) preferably has a Tg of 30°C or higher, more preferably 35 to 110°C, and even more preferably 40 to 90°C. If the Tg of the component (b3) is 30° C. or higher, the surface curability of the resin composition will be good. On the other hand, if the Tg of the component (b3) is 110° C. or less, it is possible to prevent the coating film from becoming hard and brittle. In addition, when producing a resin composition, the solubility in the monomer (A) is improved.

The Tg of the component (b3) means a value determined by the following formula (2) based on Fox's formula.
1/(273+Tg)=Σ(Wn/(273+Tgn)) Expression (2)

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), . "Tgn" is the glass transition temperature (°C) of the homopolymer of the structural unit derived from each monomer constituting the component (b3).
For these glass transition temperatures, values described in "Polymer Handbook 3rd Edition" (A WILEY-INTERSCIENCE PUBLICATION, 1989) can be used.

The type of component (b3) is not particularly limited as long as it is a polymer having 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 structural unit 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).
Component (b3) may contain only one of (b3-1) and (b3-2), or may contain both.

[Polymer (b3-1)]
The polymer (b3-1) is a homopolymer of methyl methacrylate or a copolymer of methyl methacrylate and other alkyl (meth)acrylate (provided that the structural unit derived from methyl methacrylate is 15% by mass or more). . 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, tridecyl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, dicyclopentenyl (meth) acrylate, 2-di Cyclopentenoxyethyl (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.
Polymer (b3-1) may be used alone or in combination of two or more.

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, 30,000 to 170, 000 is more preferred. If Mw is set to the above lower limit or more, the strength of the cured coating film of the resin composition can be improved. If the Mw is set to the above upper limit or less, the solubility in the components (A) and (B) is improved when the resin composition is produced.
In addition, the Mw of the polymer including the polymer (b3-1) in the present specification is a value obtained by dissolving the resin in a solvent (tetrahydrofuran) and converting the molecular weight measured by gel permeation chromatography (GPC) into polystyrene. means

The content of the polymer (b3-1) is 1 to 25 when the component (b-2) is not included, relative to a total of 100 parts by mass of the components (A), (B) and (C). Parts by mass are preferable, and 4 to 20 parts by mass are more preferable. Further, when the component (b-2) is contained in 30 parts by mass or less with respect to a total of 100 parts by mass of the components (A), (B) and (C), the amount is preferably 0 to 25 parts by mass, and 4 to 4 parts by mass. 20 parts by mass is more preferable. If the content of the polymer (b3-1) is equal to or less than the above upper limit, the pot life of the resin composition (hereinafter, means the time that the composition has fluidity and can be coated) is sufficiently It can be taken, and coating workability can be improved. On the other hand, when the content of the polymer (b3-1) is at least the above lower limit, the viscosity of the resin composition can be well balanced, its curability can be improved, and the curing time can be appropriately shortened.

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

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

When the polymer (b3-1) is a mixture of a plurality of polymers, it is preferable that the sum of the values obtained by multiplying the Mw and the content for each polymer satisfies the above formula (3). By satisfying the formula (3), the viscosity of the resin composition does not become too high, and good coating workability can be maintained.

[Polymer (b3-2)]
The polymer (b3-2) is 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 20 mass% or more).
The double bond in the polymer (b3-2) is a double bond involved 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, and the like. be done. The polymer (b3-2) is a component capable of improving the mechanical strength of the cured coating film of the resin composition.

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 the monomer having a double bond. Other acrylic monomers include monofunctional acrylic monomers, polyfunctional acrylic monomers, (meth)acrylic acid and the like.

Specific other acrylic monomers include ethyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate. , 2-ethylhexyl (meth)acrylate and other alkyl (meth)acrylates; isobornyl (meth)acrylate, cyclohexyl (meth)acrylate and other cycloalkyl (meth)acrylates; ) glycidyl (meth)acrylate and (meth)acrylic acid are examples of acrylic units that are neither acrylate units nor cycloalkyl (meth)acrylate units. These may be used individually by 1 type, and may use 2 or more types together.
Among the other acrylic monomers, alkyl methacrylate having an alkyl group having 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.

The method for producing the polymer (b3-2) is not particularly limited, but the following production method is preferred.
That is, first, as a first step reaction, methyl methacrylate, a first reactive monomer having a first functional group capable of forming an ester bond, and optionally other acrylic monomers to obtain a first copolymer having the first functional group.
Next, as a second-stage reaction, the first copolymer is provided with a second reactive group having a double bond and a second functional group capable of reacting with the first functional group to form an ester bond. In the coexistence of monomers, the first functional group and the second functional group are reacted to obtain a polymer (b3-2) having a methyl methacrylate-derived structural unit and a double bond.
A combination of the first functional group and the second functional group is preferably a carboxy group and a glycidyl group, a hydroxy group and an isocyanate group, or the like.

More specific methods for producing the polymer (b3-2) include the following methods.
In the first-stage reaction, methyl methacrylate, (meth)acrylic acid, and optionally other acrylic monomers are copolymerized to obtain a first copolymer having a carboxy group.
Next, in the reaction of the second step, the obtained first copolymer is dissolved in methyl methacrylate and allowed to coexist with glycidyl (meth)acrylate. A polymer (b3-2) having a double bond is obtained by reacting the carboxy group of the first copolymer with the glycidyl group of the glycidyl (meth)acrylate to form an ester bond.

In the reaction of the first step, the polymerization temperature during copolymerization varies depending on the polymerization method.
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.

The composition ratio of the monomers used in the first-stage reaction is 15 to 95% by mass of methyl methacrylate, 85 to 5% by mass of other acrylic monomers, and 0.3 to 4% by mass of (meth)acrylic acid. % is preferred. Furthermore, (meth)acrylic acid is more preferably 0.3 to 2% by mass.
In the second stage reaction, the amount of the methyl methacrylate monomer is preferably 70 to 150 parts by mass with respect to 100 parts by mass of the first copolymer. Further, it is preferable to react 0.9 to 1.2 mol of glycidyl (meth)acrylate with 1.0 mol of (meth)acrylic acid used in the reaction in the first stage, and 1.0 to 1.1 mol of glycidyl (meth)acrylate. A molar reaction is more preferred.

An aqueous suspension is preferable as the suspension when suspension polymerization is carried out as the polymerization method in the reaction of the first stage. A dispersant is preferably added to the aqueous suspension.
The dispersant is not particularly limited, and examples thereof include calcium phosphate, aluminum hydroxide, starch powder silica, and other poorly water-soluble inorganic compounds; polyvinyl alcohol, polyethylene oxide, cellulose derivatives, and other nonionic polymer compounds; poly(meth)acrylic acid. Anionic polymer compounds such as alkali metal salts and alkali metal salts of copolymers of (meth)acrylic acid and methyl (meth)acrylate may be mentioned.
The amount of dispersant added is preferably 0.005 to 5% by mass, more preferably 0.01 to 1% by mass, based on the total mass of the suspension.

The suspension preferably contains electrolytes such as sodium carbonate, sodium sulfate and manganese sulfate. Dispersion stability can be improved by containing an electrolyte. The amount of electrolyte to be added may be appropriately set and is not particularly limited.

A polymerization initiator is preferably used in the suspension polymerization.
Examples of polymerization initiators include benzoyl peroxide, lauroyl peroxide, methyl ethyl ketone peroxide, tert-butyl peroxybenzoate, cumene hydroperoxide, cyclohexanone peroxide, dicumyl peroxide, bis(4-tert-butylcyclohexyl). organic peroxides such as 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 of the polymerization initiator to be added and the method of addition may be set as appropriate, and are not particularly limited.

A chain transfer agent is preferably used in the suspension polymerization. The Mw of the resulting polymer can be easily adjusted by using a chain transfer agent.
A thiol compound is preferred as the chain transfer agent.
Examples of thiol compounds include alkyl mercaptans such as t-butyl mercaptan, n-octyl mercaptan and n-dodecyl mercaptan; aromatic mercaptans such as thiophenol thionaphthol; alkyl thioglycolates such as thioglycolic acid and octyl thioglycolate. etc.
The amount and method of addition of the chain transfer agent may be set appropriately and are not particularly limited.

In the second step reaction, an esterification catalyst can be used to promote the reaction between the first functional group and the second functional group.
Examples of esterification catalysts 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 set and is not particularly limited.

A polymerization inhibitor may be added in the second stage reaction. By adding a polymerization inhibitor, the second stage reaction can be carried out more stably.
Polymerization inhibitors include hydroquinone, hydroquinone monomethyl ether, 2,6-di-t-butyl-4-methylphenol and the like. These may be used alone or in combination of two or more.
The amount of the polymerization inhibitor to be added may be appropriately set and is not particularly limited.

The mass average molecular weight (Mw) of the first copolymer obtained in the reaction of the first stage is preferably in the range of 10,000 to 200,000, more preferably 20,000 to 170,000, and 30,000 to 170,000 is more preferred.
When the weight average molecular weight is at least the above lower limit, the strength of the cured product tends to be sufficiently high. If the weight-average molecular weight is equal to or less than the upper limit, workability in handling the resin composition will be good.

The polymer (b3-2) obtained in the second step reaction has a double bond, that is, the carboxy group contained in the first copolymer is converted to the glycidyl group of glycidyl (meth)acrylate by the second step reaction. It can also be confirmed by checking that the acid value of the polymer (b3-2) is 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 a polymer as used herein means a value obtained by dissolving the polymer in toluene and titrating with a 0.1N KOH ethanol solution using phenolphthalein as an indicator.

The content of the polymer (b3-2) is 1 to 25 when the component (b-2) is not included, with respect to the total of 100 parts by mass of the components (A), (B) and (C). Parts by mass are preferable, and 4 to 20 parts by mass are more preferable. Further, the content of the polymer (b3-2) is 30 parts by mass or less of the component (b-2) with respect to the total of 100 parts by mass of the components (A), (B) and (C). is preferably 0 to 25 parts by mass, more preferably 4 to 20 parts by mass. When the content of the polymer (b3-2) is equal to or less than the above upper limit, the pot life of the resin composition can be sufficiently secured, and coating workability can be improved. On the other hand, when the content of the polymer (b3-2) is at least the above lower limit, the viscosity balance of the resin composition can be improved, the curability can be improved, and the curing time can be appropriately shortened.

The content of the polymer (b3-2) is within the above range (0 to 25 parts by mass) with respect to a total of 100 parts by mass of the components (A), (B) and (C), and the following formula It is more preferable to satisfy (4). By satisfying the following formula (4), the viscosity of the resin composition does not become too high, and good coating workability can be achieved.

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

When the polymer (b3-2) is a mixture of a plurality of polymers, it is preferable that the sum of the values obtained by multiplying the Mw by the content for each polymer satisfies the above formula (4). By satisfying the formula (4), the viscosity of the resin composition does not become too high, and good coating workability can be maintained.

The content of the polymer (b3) is 1 to 25 parts by mass when the component (b-2) is not included, with respect to the total of 100 parts by mass of the components (A), (B) and (C). is preferred, and 4 to 20 parts by mass is more preferred. Further, when the component (b-2) is contained in 30 parts by mass or less with respect to a total of 100 parts by mass of the components (A), (B) and (C), the amount is preferably 0 to 25 parts by mass, and 4 to 4 parts by mass. 20 parts by mass is more preferable. When the content of the polymer (b3) is equal to or less than the above upper limit, the pot life of the resin composition can be sufficiently secured, and the coating workability can be improved. On the other hand, when the content of the polymer (b3) is at least the lower limit, the viscosity balance of the resin composition is improved, the curability can be improved, and the curing time can be appropriately shortened.
When the polymer (b3) is a mixture of the polymer (b3-1) and the polymer (b3-2), it preferably satisfies the following formula (5). By satisfying the following formula (5), the viscosity of the resin composition does not become too high, and good coating workability can be achieved.

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

The content of component (B) is preferably 15 to 35 parts by mass, more preferably 20 to 35 parts by mass, per 100 parts by mass of components (A), (B) and (C). By setting the content of component (B) to 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 setting the content of the component (B) to 35 parts by mass or less, the viscosity of the resin composition does not become too high, workability is improved, and adhesion to the substrate can be improved.

<(C) Component>
A plasticizer is mentioned as a (C) component which can be used for the resin composition of this invention as needed.
A plasticizer is an ingredient that can reduce the shrinkage of the coating during curing.
Plasticizers include phthalates such as dibutyl phthalate, di-2-ethylhexyl phthalate and diisodecyl phthalate; adipates such as di-2-ethylhexyl adipate and octyl adipate; dibutyl sebacate and di-2-ethylhexyl seba. sebacic acid esters such as cate; alkylsulfonic acid esters such as alkylsulfonic acid phenyl ester; cyclohexanedicarboxylic acid dialkyl esters such as 1,2-dicyclohexanedicarboxylic acid diisononyl ester; di-2-ethylhexylazelate, octylaze dibasic fatty acid esters such as azelaine esters such as lath; paraffins such as chlorinated paraffins; A plasticizer may be used individually by 1 type, and may use 2 or more types together.
The content of the plasticizer is preferably 15 parts by mass or less with respect to a total of 100 parts by mass of components (A), (B) and (C). By setting the content of the plasticizer to 15 parts by mass or less, the mechanical strength of the coating film can be improved, and the plasticizer can be prevented from exuding onto the surface of the coating film.

<Other additive components>
Other additive components that can be optionally used in the resin composition of the present invention include waxes, curing accelerators, curing agents, polymerization inhibitors, silane coupling agents, ultraviolet absorbers, light stabilizers, and stabilizers. Modifiers, reinforcing materials, other polymer components, isocyanate prepolymers, elastomers, epoxy resins, aggregates, inorganic pigments such as chromium oxide and red iron oxide, organic pigments such as phthalocyanine blue, and the like can be used. In addition, the resin composition may contain an antifoaming agent, a defoaming agent, a leveling agent, and the like as additive components for the purpose of improving coating workability and appearance.

[wax]
Wax is a component for improving the surface curability by shutting off the air on the surface of the coating film during the curing reaction. A wax that does not dissolve in the components (A) and (B) can be used.
Specific examples of the wax include various known waxes such as paraffin wax and microcrystalline wax.
The wax preferably has a melting point of 40° C. or higher and 120° C. or lower. Two or more waxes having different melting points can be used together.

As the wax, a wax dispersed in an organic solvent may be used in order to improve the surface curability. Since the wax is dispersed in the organic solvent and finely divided into fine particles, the air blocking action can be effectively exhibited. A commercially available wax can be used as the dispersed wax, and the resin composition can be prepared by adding the wax as it is. In this case, the resin composition will also contain 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.

The content of the wax is 0.1 to 3 parts per 100 parts by mass in total of the components (A), (B) and (C) from the viewpoint of the balance between the air blocking action and the physical properties of the coating film. Parts by mass are preferable, and 0.1 to 2 parts by mass are more preferable.
If the wax content is at least the above lower limit, a sufficient air barrier effect can be obtained when the resin composition is applied and cured, and surface curability can be improved. When the wax content is equal to or less than the above upper limit, the viscosity of the resin composition does not become too high, and physical properties of the coating film, such as curing speed and stain resistance, tend to be good. Moreover, the storage stability of the resin composition is improved.

[Curing accelerator]
The resin composition of the present invention preferably contains a curing accelerator.
Curing accelerators include tertiary amines, organometallic compounds, metal soaps, and the like.
Specific examples of tertiary amines include 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( N,N-substituted anilines such as 2-hydroxypropyl)-p-toluidine, triethanolamine, diethylenetriamine, phenylmorpholine, N,N-bis(hydroxyethyl)aniline, diethanolaniline, N,N-substituted-p-toluidine , 4-(N,N-substituted amino)benzaldehyde and the like.
A tertiary amine may be used individually by 1 type, and may use 2 or more types together.

Among tertiary amines, aromatic tertiary amines are preferred. Preferred aromatic tertiary amines are compounds in which at least one aromatic residue is directly bonded to a nitrogen atom.
Examples of the aromatic tertiary amines 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; N,N-di(2-hydroxyethyl)-p-toluidine or Examples thereof include ethylene oxide or propylene oxide adducts of 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, and N,N-di(2-hydroxyethyl) are used in terms of curability of the resin composition. -p-toluidine, N,N-di(2-hydroxypropyl)-p-toluidine are preferred.

The amount of the curing accelerator added is 0.05 to 10 parts by mass with respect to a total of 100 parts by mass of the components (A), (B) and (C) from the viewpoint of the balance between curability and workability. parts, more preferably 0.2 to 8 parts by mass, even more preferably 0.3 to 5 parts by mass. If the amount of the curing accelerator added is at least the above lower limit, good surface curability can be obtained, and if it is below the above upper limit, an appropriate pot life can be obtained even at low temperatures.
The amount of the curing accelerator to be added is preferably adjusted appropriately according to the type of curing accelerator to be used and the temperature environment.

Examples of the organometallic compounds include organometallic compounds such as cobalt naphthenate, manganese naphthenate, nickel octylate, cobalt octylate, and cobalt acetoacetate. By adding these organometallic compounds to the resin composition, the surface curability can be improved.

The amount of the organometallic compound added is derived from the organometallic compound with respect to a total of 100 parts by mass of the components (A), (B) and (C) from the viewpoint of the balance between curability and workability. The metal content is preferably 0.3 parts by mass or less, more preferably 0.2 parts by mass or less.
The amount of the organometallic compound to be added is preferably adjusted appropriately according to the type of curing accelerator to be used and the temperature environment.

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

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

The amount of the curing agent to be added is preferably adjusted appropriately so that the usable life of the resin composition is 15 to 60 minutes. When the curing agent is added in the above amount, the polymerization reaction can be started immediately after the addition, and the curing of the resin composition can proceed.
When benzoyl peroxide is used as a curing agent, the amount added is preferably 0.25 to 5 parts by mass, preferably 0.25 parts, per 100 parts by mass in total of components (A), (B) and (C). ~4 parts by mass is more preferred. If the amount of benzoyl peroxide to be added is at least the above lower limit, the curability will be good, and if it is at most the above upper limit, the coating workability of the resin composition and various physical properties of the resulting coating film will tend to improve. be. However, it is preferable to adjust the amount of the curing agent to be added according to the temperature of use.

[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). Other polymer components include vinyl chloride/vinyl acetate copolymers, elastomer components, epoxy resins, and the like. It is preferable to adjust the content of other polymer components as appropriate so as not to impair the transparency of the cured product.

Examples of the elastomer component include thermoplastic elastomers such as olefinic thermoplastic elastomers, polybutadiene thermoplastic elastomers, styrene/butadiene thermoplastic elastomers, and styrene/isoprene thermoplastic elastomers. The structure of the elastomer component may be linear, branched, grafted, or core/shell.

The amount of the elastomer component to be blended is preferably less than 20 parts by mass with respect to a total of 100 parts by mass of components (A), (B) and (C). 6) is more preferably satisfied. By satisfying the following formula (6), the viscosity of the resin composition does not become too high, and good coating workability can be achieved.

0<Mw of elastomer component×content of elastomer component<1,200,000 Expression (6)

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

[Polymerization inhibitor]
As a polymerization inhibitor, hydroquinone, 2-methylhydroquinone, hydroquinone monomethyl ether, 2-6-di-t-butyl-4-methylphenol, etc. are preferably added for the purpose of improving storage stability.

[Silane coupling agent]
Silane coupling agents include, for example, γ-(glycidoxypropyl)trimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyl Examples include silane coupling agents having one (meth)acryloyl group such as trimethoxysilane, 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 with respect to a total of 100 parts by mass of components (A), (B) and (C), and 3 parts by mass from the viewpoint of curability and cost. The following are more preferred. By setting the content of the silane coupling agent to the above upper limit or less, it is possible to improve the adhesiveness to the inorganic component and the surface curability of the resin composition.

[Ultraviolet absorber]
A UV absorber is used for the purpose of improving the weather resistance of the coating film.
UV absorbers include 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-octyloxybenzophenone, 2-hydroxy-4-decyloxybenzophenone, 2-hydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4 ,4'-dibutoxybenzophenone and other derivatives of 2-hydroxybenzophenone; 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-ditertiarybutyl phenyl)benzotriazole or halides thereof; phenyl salicylate, p-tert-butylphenyl salicylate and the like. These may be used individually by 1 type, and may use 2 or more types together.

[Light stabilizer]
Light 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 and the like. These may be used individually by 1 type, and may use 2 or more types together.

[thixotropic agent]
A thixotropic agent is an additive component that imparts thixotropy to the resin composition. Specifically, when the thixotropic agent is contained, structural viscosity is imparted to the resin composition, thixotropy is increased, additives in the resin composition can be uniformly distributed, and storage stability of the resin composition is improved. improves. Further, if a thixotropic agent is contained, the coating workability of the resin composition can be improved, for example, when applying it to an inclined surface.
As the thixotropic agent, organic thixotropic agents such as urethane urea, fatty acid amide, organic bentonite, polyethylene oxide wax, etc., and fine particle silica are preferred. Thixotropic agents may be used singly or in combination of two or more.
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 fine silica particles 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 100 parts by mass in total of components (A), (B), and (C). On the other hand, 5 parts by mass or less is preferable. When the thixotropic agent is fine silica, the content of fine silica is preferably 10 parts by mass or less.
When the content of the thixotropic agent is too high, the fluidity of the resin composition is lowered and the coating workability is lowered, so that a uniform coating film may not be obtained.

[Reinforcing material]
The reinforcing material is preferably used when the flexibility and tensile elongation at break of the resin composition are excessive for the usage.
Examples of reinforcing materials include chopped strands, roving net-like glass fibers, vinylon fibers, and nylon fibers. One reinforcing material may be used alone, or two or more reinforcing materials may be used in combination.

[Antifoaming agent]
Antifoaming agents include known antifoaming agents. Specifically, an acrylic antifoaming agent obtained by dissolving a special acrylic polymer in a solvent, a vinyl antifoaming agent obtained by dissolving a special vinyl polymer in a solvent, and the like can be mentioned. Among antifoaming agents, Disparlon series commercially available from Kusumoto Kasei Co., Ltd. 1950, P-410EF, P-420, P-425, PD-7, 1970, 230, 230EF, LF-1980, LF-1982, LF-1983, LF-1984, LF-1985, etc.) and the like are preferable, Of the Disparlon series, 230, 230EF, LF-1980 and LF-1985 are more preferred, and 230EF and LF-1985 are even more preferred. BYK-052N and BYK-1752 commercially available from BYK-Chemie Japan Co., Ltd. can also be used. An antifoaming agent may be used individually by 1 type, and may use 2 or more types together.
The content of the antifoaming agent is preferably 3 parts by mass or less, more preferably 2 parts by mass or less with respect to a total of 100 parts by mass of components (A), (B) and (C). If it is not more than the above upper limit, air bubbles entrained when the resin composition is stirred and mixed can be effectively removed, and a coating film free of entrained air bubbles can be obtained.

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

[Epoxy resin]
Epoxy resin is a component that improves adhesion to inorganic substrates. Therefore, if the resin composition contains an epoxy resin, the adhesiveness to crushed stones used for concrete or asphalt pavement can be improved.
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, and the like. Epoxy resins may be used singly or in combination of two or more.
The content of the epoxy resin is preferably 20 parts by mass or less, more preferably 10 parts by mass or less with respect to a total of 100 parts by mass of components (A), (B) and (C). If the content of the epoxy resin is equal to or less than the above upper limit, the curing time can be shortened while the pot life of the resin composition is sufficiently ensured, resulting in good workability.

[thiol compound]
A thiol compound can be used in the resin composition of the present invention. Examples of the thiol compound include aromatic thiophenol and aliphatic thiol. Among them, it is preferable to contain an aliphatic thiol.
Moreover, among thiol compounds, one or more thiol compounds selected from primary thiol compounds, secondary thiol compounds, and tertiary thiol compounds can be used. By blending a thiol compound in the present invention, 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. Alternatively, polyfunctional thiol, which is a compound having two or more secondary thiol groups, is preferred. Among them, polyfunctional thiol, which is a compound having 3 or more primary or secondary thiol groups in the molecule, is more preferable.
The polyfunctional thiol means a thiol compound having two or more functional thiol groups in the molecule.

Specific examples of primary thiol compounds include trimethylolpropane trismercaptoacetate, trimethylolpropane tris (3-mercaptopropionate), trimethylolpropane tris (4-mercaptobutyrate), pentaerythritol tetramercaptoacetate, and 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, tetraethylene glycol bis(3-mercaptopropionate), tetraethylene Glycol bis(3-mercaptobutyrate), tris-[(3-mercaptopropionyloxy)-ethyl]-isocyanurate, tris-[(3-mercaptobutyryloxy)-ethyl]-isocyanurate and the like.

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), trimethylol ethane tris (3-mercaptopropionate), trimethylol ethane tris (3-mercaptobutyrate), trimethylol propane tris (3 -mercaptobutyrate), pentaerythritol tetrakis (3-mercaptobutyrate), dipentaerythritol hexakis (3-mercaptobutyrate), ethylene glycol bis (2-mercaptopropionate), propylene glycol bis (2-mercaptopropionate) pionate), 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), butane diol 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 rate), 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), bisphenol 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 isocyanate Nurate, pentaerythritol tetrakis(3-mercapto-3-phenylpropionate), dipentaerythritol hexakis(3-mercapto-3-phenylpropionate) and the like.
Among them, 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) and the like are preferred. These may be used individually by 1 type, and may use 2 or more types together.

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

The content of the thiol compound in the resin composition of the present invention is preferably 0.05 to 2 parts by mass, more preferably 0.1 to 1.5 parts by mass, with respect to 100 parts by mass of the radical polymerizable compound described later. . If the content of the thiol compound is 0.05 parts by mass or more, the surface curability when cured in a thin layer is good, and if it is 2 parts by mass or less, the thiol compound when cured in a thin layer. The amount used can be reduced.
A thiol compound may be used individually by 1 type, and may use 2 or more types together. A primary thiol compound and a secondary thiol compound may be used in combination.

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

The specific surface area of the aggregate is preferably 50 to 25,000 cm ² /g, more preferably 100 to 20,000 cm ² /g, even more preferably 150 to 15,000 cm ² /g. In addition, the said specific surface area means the value measured by the Blaine permeation method. As the aggregate, one type having a single specific surface area may be used alone, or two or more types having different specific surface areas may be used in combination.

If the specific surface area of the aggregate is at least the above lower limit, separation between the aggregate and the resin component is less likely to occur, the coating film tends to be easily secured, and a coating film with good physical properties such as flexibility can be obtained. It is in. On the other hand, if the specific surface area of the aggregate is equal to or less than the upper limit, the aggregate and the resin component are less likely to separate, and the tensile elongation at break of the cured product becomes higher.

When the 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 more preferably 150 to 300 parts by mass with respect to 100 parts by mass of the resin composition of the present invention. More preferred. When 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, when the content of the aggregate is 400 parts by mass or less, the coating workability of the resin composition is improved.

The viscosity of the resin composition of the present invention is 10 to 200 mPa s, preferably 15 to 150 mPa s, at 23° C. measured with a Brookfield viscometer BM compliant with JIS-Z8803. 20 to 100 mPa·s is preferred. Within the above range, the higher the viscosity, the more it is possible to prevent dripping during coating. Within the above range, the lower the viscosity, the better the workability during coating.

The resin composition of the present invention is prepared by blending the resin composition with an aggregate and a curing agent, and the viscosity of the resin composition at -10 ° C. measured with a Brookfield viscometer BM type specified in JIS-Z8803 is The time required to reach 40,000 mPa·s is 15 to 60 minutes, preferably 20 to 50 minutes, more preferably 25 to 40 minutes. Within the above range, the longer the time, the more time can be spent on the coating work. Within the above range, the shorter the time, the shorter the coating work time can be.

The flash point of the resin composition of the present invention is 21°C or higher. When the flash point is 21° C. or higher, the risk of ignition is reduced, and a resin composition with high safety and low odor can be obtained. The flash point means the value measured by the rapid equilibrium closed method described in JIS K2265-2:2007. From the viewpoint of safety and odor reduction, the flash point is preferably 25°C or higher, more preferably 45°C or higher.

The resin composition of the present invention has a resin composition viscosity of 800 to 800 as measured by a Brookfield viscometer BM type specified in JIS-Z8803 when 100 to 400 parts of aggregate is blended with 100 parts of the resin composition. 5,000 mPa·s is preferred. Within the above range, the higher the viscosity, the more difficult it is for the aggregate to precipitate when the aggregate is added to the resin composition, so that the aggregate-containing resin composition can be uniformly coated. Within the above range, the lower the viscosity, the better the workability during coating.

When the resin composition containing the aggregate and the curing agent was cast and cured on a concrete surface so that the adhesive surface was 20 mm × 20 mm and the thickness was 15 mm, the loading surface at 23 ° C. was 15 mm × 20 mm. The adhesive strength measured by a shear test in which a load is applied is preferably 0.49 MPa or more, more preferably 0.70 MPa or more, and still more preferably 1.10 MPa or more. Within the above range, the higher the adhesive strength, the more difficult it is for the base material and the layer of the cured resin composition to separate from each other, so that a firm repair can be performed.

The mixing of the aggregate and the curing agent is preferably carried out at -15 to 35°C, more preferably -10 to 35°C. If the temperature of the compounding is within the above range, the cement asphalt mortar layer of the slab track can be repaired using the resin composition under a wide range of temperature conditions from room temperature to low temperature.

Density D1 of an aggregate-containing resin composition obtained by blending 100 to 400 parts of aggregate with respect to 100 parts of the resin composition of the present invention, measured by a method in accordance with JIS-K5600 2-4, and the aggregate The resin composition containing the aggregate is poured into a mold with inner dimensions of 120 mm wide × 120 mm long × 30 mm high and cured and cured, and then cut into a size of 100 mm wide × 100 mm long × 25 mm high. From the density D2 calculated from the mass of the cured product of the resin composition, the cure shrinkage calculated by the following formula (1) is preferably 5% or less, more preferably 4% or less, and even more preferably 3% or less. .
Cure shrinkage rate (%) = [(D2-D1) / D2] × 100 Equation (1)
In the formula (1), "D1" is the density of the liquid aggregate-containing resin composition measured by a method conforming to JIS K 5600 2-4, and "D2" is the density of the aggregate-containing resin composition. It is the density of the cured product.
Within the above range, the lower the cure shrinkage, the higher the adhesive strength between the substrate and the layer of the cured product of the resin composition, so that firm repair can be performed.

The surface hardness of the cured resin composition containing the aggregate is preferably 80 to 99, more preferably 90 to 99, and 95 at 23° C. measured with a type E durometer specified in JIS-K6253-3. ~99 is more preferred. 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 separate from the base material, and the stronger the repair can be performed.

The resin composition of the present invention is preferably used for pouring into a defective portion when repairing the defective portion of the cement asphalt mortar layer of the slab track. By pouring the resin composition into the defect, since the curing shrinkage rate of the resin composition is low, the adhesive strength between the substrate and the cured product layer of the resin composition is increased, and the defect can be repaired firmly. can be done.

The compound having a polymerizable double bond used in the resin composition of the present invention preferably contains a monomer having a solubility parameter of 9.5 (cal/cm ³ ) ^1/2 or more. By including a monomer having a solubility parameter of 9.5 (cal/cm ³ ) ^1/2 or more, the compatibility of the compound having a polymerizable double bond with the resin composition is improved.

<Method for producing resin composition>
Examples of the method for producing the resin composition of the present invention include a method of mixing each of the above components with a commonly used stirrer.

<Effect>
The resin composition of the present invention can provide a resin composition with good adhesive strength and low odor under a wide range of temperature conditions from room temperature to low temperature.
In addition, since the cured product of the resin composition of the present invention has excellent mechanical properties and weather resistance, it is suitable as a civil engineering and construction material such as a coating material, a floor coating material, a road surface pavement material, a wall material, and a repair filler. can be used for
In addition, the resin composition of the present invention can be injected and filled as a repair material for road defects, or used as a repair material for defects in the cement asphalt mortar layer of railway slab tracks. Rapid application is possible under temperature conditions, and a hardened body with a small hardening shrinkage can be obtained.
Furthermore, according to the present invention, for example, repair of road ruts, repair of road defects, correction of steps such as roads, height adjustment of railroad track slabs, prevention of tilting of track slabs when trains pass, and penetration of rainwater. It is very useful in applications aimed at stabilizing structures, such as preventing scattering of cement asphalt mortar crushed by weathering and the like.

"Laminate"
A laminate using the resin composition of the present invention comprises a base material and a coating film made of a cured product of the resin composition of the present invention formed on the surface of the base material. The laminate is obtained by applying the resin composition of the present invention to a substrate and curing it to form a cured product.

Examples of base materials include cement concrete, asphalt concrete, mortar concrete, resin concrete, permeable concrete, ALC (lightweight foamed concrete) board, PC (precast concrete) board, asphalt, asphalt concrete, semi-flexible pavement, and the like. These may be used alone or in combination of two or more as a base material. Concrete may or may not contain reinforcing bars.
The base material can be used for building floors, platforms, roads, bridges, floor slab structures such as elevated bridges, and the like.
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.

The thickness of the coating film is not particularly limited, and is determined, for example, according to the functions required of the laminate.
Examples of the method of forming the coating film include a method of applying the resin composition of the present invention to a substrate and curing the same.
Examples of the coating method include known coating methods using rollers, metal trowels, brushes, swivel bows, coating machines (spray coating machines, etc.), and the like. When using a two-component airless coating machine, it is divided into two components, the main agent side and the curing agent side. A curing accelerator is added to the main agent side, and an organic peroxide as a curing agent is added to the curing agent side. A method is preferred.

The temperature during coating 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 are adjusted by appropriately adjusting the amounts of the curing agent and curing accelerator that are organic peroxides.

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

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

The method of injecting the resin composition into the cement asphalt mortar layer of the slab track is not particularly limited. A method of injection filling and curing the layer can be mentioned.
Alternatively, a two-liquid type resin composition obtained by adding a curing accelerator and a curing agent to separate resin compositions and further blending an aggregate is fed by a machine or the like, and a static mixer is added in the liquid feeding path. It may be filled and hardened by various methods such as a method of mixing with a line mixer such as a line mixer, filling and hardening.
Alternatively, a cylindrical bag made of non-woven fabric or the like may be placed in advance at a location to be filled, and a one-liquid or two-liquid filling composition may be filled in the cylindrical bag and cured.

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples.
All "parts" in the following examples mean "mass parts", and all "%" other than the degree of saponification and humidity mean "% by mass".

[Synthesis Example 1: Synthesis of acrylic polymer (P-1)]
Add 135 parts of deionized water and 0.4 parts of polyvinyl alcohol (degree of saponification 80 mol%, degree of polymerization 1,700) as a dispersing agent into a polymerization apparatus equipped with a stirrer, a cooling tube, and a thermometer, and stir. After the polyvinyl alcohol was completely dissolved, the stirring was once stopped. Methyl methacrylate (hereinafter abbreviated as "MMA") 40 parts, n-butyl methacrylate (hereinafter abbreviated as "n-BMA") 60 parts, 2,2'-azobis-2-methylbutyro as a polymerization initiator 0.2 parts of nitrile (hereinafter abbreviated as "AMBN"), 0.5 parts of n-dodecyl mercaptan (hereinafter abbreviated as "n-DM") as a chain transfer agent, and 0.1 part of sodium carbonate as an electrolyte The mixture was added, stirred again, heated to 75° C., and reacted for 2.5 hours. Furthermore, after raising the temperature to 98° C. and maintaining it for 1.5 hours, the reaction was terminated.
Next, after cooling to 40°C, the resulting aqueous suspension was filtered through a nylon filter cloth with an opening of 45 µm, and the filtrate was washed with deionized water, dehydrated, and dried at 40°C for 16 hours. to obtain a granular acrylic polymer (P-1).
The obtained 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.

[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 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. changed to A particulate acrylic polymer (P-2) having a Tg of 64° C. and a mass average molecular weight of 160,000 was obtained in the same manner as in Synthesis Example 1 except for the above.

[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 copies. A particulate acrylic polymer (P-3) having a Tg of 64° C. and a mass average molecular weight of 40,000 was obtained in the same manner as in Synthesis Example 1 except for the above.

<Preparation of resin composition>
[Adjustment of resin composition (S-1)]
In a 1 L flask equipped with a stirrer, a thermometer and a cooling tube, 50.0 parts of n-BMA (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester B) as the component (A), 2-ethylhexyl acrylate (Mitsubishi Chemical Corporation manufactured by Mitsubishi Chemical Corporation, trade name: 10.0 parts of 2-ethylhexyl acrylate (hereinafter abbreviated as “2-EHA”), and 2-hydroxypropyl methacrylate (manufactured by Mitsubishi Chemical Corporation, trade name: Acryester HP (hereinafter abbreviated as “2-EHA”)). -HPMA”)) 10.0 parts, as the component (B), polypropylene glycol dimethacrylate (manufactured by NOF Corporation, trade name: Blemmer PDP-400N (hereinafter abbreviated as “PDP-400N”)) 5 0.0 part, 0.003 part of 4-methoxyphenol (hereinafter abbreviated as "MEHQ") as a light stabilizer, and phenol alkylsulfonic acid ester (manufactured by Lanxess, trade name: Mezamol) as component (C). 9.0 parts, 3-methacryloxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM-503) 0.5 parts, paraffin-115 as wax (manufactured by Nippon Seiro Co., Ltd., paraffin wax (hereinafter "P-115" for short.))) 0.4 parts, and paraffin-130 (manufactured by Nippon Seiro Co., Ltd., paraffin wax (hereinafter abbreviated as "P-130"))) 0.6 parts, antifoaming agent ( BYK-Chemie Japan Co., Ltd., trade name: BYK-1752) 0.5 parts, wetting and dispersing agent (BYK-Chemie Japan Co., Ltd., trade name: Disperbyk-2164) 0.5 parts, N, N as a curing accelerator -Dimethyl-p-toluidine (hereinafter abbreviated as "DMPT") 2.0 parts were added, and then 16.0 parts of the polymer (P-1) as the component (b3) was added while stirring. Subsequently, it was dissolved by heating at 70° C. for 2 hours. After confirming dissolution, the mixture was cooled to obtain a resin composition (S-1). Table 1 shows the formulation of the obtained resin composition (S-1).

[Preparation of Resin Compositions (S-2) to (S-23)]
Resin compositions (S-2) to (S-23) were obtained in the same manner as the resin composition (S-1) except that the blending composition was changed to the composition shown in Tables 1 and 2. Tables 1 and 2 show the formulations of the obtained resin compositions (S-1) to (S-23).

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

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

Abbreviations in Tables 1 and 2 mean the following, respectively.
- 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, trade name: Acryester PBOM).
· NK Ester APG-400: Polypropylene glycol diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: NK Ester APG-400).
· PDP-400N: Polypropylene glycol dimethacrylate (manufactured by NOF Corporation, trade name: Blemmer PDP-400N).
· SUA-017: urethane acrylate (trade name: EXCELATE SUA-017, manufactured by Asia Industry Co., Ltd.).
· SUA-008: urethane acrylate (trade name: EXCELATE SUA-008, manufactured by Asia Industry Co., Ltd.).
· SUA-015: urethane acrylate (trade name: EXCELATE SUA-015, manufactured by Asia Industry Co., Ltd.).
P-1: MMA/n-BMA=40/60 copolymer (Tg=50° C., Mw=60,000).
P-2: MMA/n-BMA=60/40 copolymer (Tg=64° C., Mw=160,000).
P-3: MMA/n-BMA=60/40 copolymer (Tg=64° C., Mw=40,000).
- Mezamol: Alkyl sulfonic acid phenyl ester (manufactured by Shima Boeki 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., trade name: Paraffin 115).
- Paraffin 130: Paraffin wax (manufactured by Nippon Seiro Co., Ltd., trade name: Paraffin 130).
- Paraffin 150: Paraffin wax (manufactured by Nippon Seiro Co., Ltd., trade 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: Antifoaming agent (manufactured by BYK-Chemie Japan, trade name: BYK-1752).
- BYK-2164: Wetting and dispersing agent (manufactured by BYK-Chemie Japan, trade name: Disperbyk-2164).

<Performance evaluation>
A resin composition was prepared as follows, and the viscosity, pot life, adhesive strength, cure shrinkage and hardness of the formulation were measured or evaluated. The results are shown in Tables 3 and 4.

(Example 1)
[Evaluation 2]
(Formulation viscosity)
The resin composition S-1 and calcium carbonate G-100 (manufactured by Sankyo Seifun Co., Ltd., trade name: sandy charcoal G-100 (hereinafter abbreviated as “charcoal calc G-100”)) as an aggregate are -10. C. for 4 hours or longer, and the temperature of the resin composition and calcium carbonate G-100 was confirmed to be -10.degree.
In an environment of −10° C., 400 g of resin composition S-1 was added to a 1 L container, and while stirring at 1,500 rpm with a homodisper, 880 g of calcium carbonate G-100 was added and stirred for 3 minutes.
Subsequently, 48 g of a curing agent Perkadox 33 (manufactured by Kayaku Nourion Co., Ltd., trade name: Perkadox 33 (purity of benzoyl peroxide: 33%) (hereinafter abbreviated as “Perkadox 33”)) was added, and 1 more Agitation was performed for 1 minute.
Immediately after the stirring of Perkadox 33 was completed, the viscosity of the formulation was measured in an environment of −10° C. with a Brookfield viscometer, and the viscosity 3 minutes after the addition of Perkadox 33 was taken as the viscosity of the formulation.
In addition, since the exact viscosity could not be measured for those in which the aggregate settled immediately after blending, it was evaluated as "not measurable."

(pot life)
Resin composition S-1 and calcium carbonate G-100 as an aggregate (manufactured by Sankyo Seifun Co., Ltd., trade name: Sandy Charcoal G-100 (hereinafter abbreviated as “Charcoal Calc G-100”), specific surface area: 1,000 cm ² /g) was cured at -10°C for 4 hours or more, and the temperature of the resin composition and calcium carbonate G-100 was confirmed to be -10°C.
In an environment of −10° C., 400 g of resin composition S-1 was added to a 1 L container, and while stirring at 1,500 rpm with a homodisper, 880 g of calcium carbonate G-100 was added and stirred for 3 minutes.
Subsequently, 48 g of a curing agent Perkadox 33 (manufactured by Kayaku Nourion Co., Ltd., trade name: Perkadox 33 (purity of benzoyl peroxide: 33%) (hereinafter abbreviated as “Perkadox 33”)) was added, and 1 more Stirring was performed for 1 minute.
Immediately after the stirring of Perkadox 33 was completed, the viscosity of the formulation was measured in an environment of −10° C. with a Brookfield viscometer. The pot life was defined as the time required to reach 000 mPa·s.
In addition, since the exact viscosity could not be measured for those in which the aggregate settled immediately after blending, it was evaluated as "not measurable."

(adhesion strength)
Since it is a shearing method that loads the hardened material cast and adhered to the concrete surface, a concrete plate of 50 mm × 50 mm × 25 mm in thickness is used as the base material, and the resin composition compound can be cast in the central part of 50 mm × 50 mm. A mold of 20 mm×20 mm×15 mm in height was produced.
The concrete base material provided with the formwork, the resin composition S-1, and the calcium carbonate G-100 were cured at -10°C for 4 hours or more, and the temperature of the concrete base material, the resin composition, and the calcium carbonate G-100 became -. Make sure it is 10°C.
In an environment of −10° C., 400 g of resin composition S-1 was added to a 1 L container, and while stirring at 1,500 rpm with a homodisper, 880 g of calcium carbonate G-100 was added and stirred for 3 minutes.
Subsequently, 48 g of a curing agent Perkadox 33 (manufactured by Kayaku Nourion Co., Ltd., trade name: Perkadox 33 (purity of benzoyl peroxide: 33%) (hereinafter abbreviated as “Perkadox 33”)) was added, and 1 more Stirring was performed for 1 minute.
After the completion of stirring Perkadox 33, the mixture was immediately put into a form provided on the concrete base material in an environment of -10°C, cured at -10°C for 24 hours or more, and then cured at 23°C and 50% RH for 24 hours. After curing for more than 1 hour, the mold is removed, the 20 mm × 15 mm surface where the resin composition formulation is cured is used as the loading surface, and the test piece is fixed to the material testing machine so that the test force is applied perpendicularly and evenly to the loading surface, Loading was performed at a test speed of 1 mm/min using a material testing machine. At that time, the maximum load until the adhesive portion peeled off was measured, and the adhesive strength was obtained from the following formula (7).

σ=F/S Expression (7)
σ: adhesive strength (MPa), F: maximum load (N), S: adhesive area (20 mm × 20 mm)
In the case where the aggregate settled immediately after blending, the adhesive strength could not be measured accurately, so it was evaluated as "not measurable."
When the adhesion strength test was conducted, if the measured value was too low and the layer of the resin composition was delaminated from the base material, it was evaluated as "peeling".

[Evaluation 3]
(curing shrinkage)
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 temperature of the resin composition and calcium carbonate G-100 was 23°C.
In an environment of 23° C., 200 g of resin composition S-1 was added to a 1 L container, and while stirring at 1,500 rpm with a homodisper, 440 g of calcium carbonate G-100 was added and stirred for 3 minutes.
JIS K 5600 2-4 "general test method of paint - property stability of paint - density" of the formulation of the resin composition was introduced into a metal pycnometer (specific gravity cup: 100 mL), and air bubbles mixed in was removed, the liquid density D1 of the formulation of the resin composition was measured.
In an environment of 5° C., 400 g of resin composition S-1 was added to a 1 L container, and while stirring at 1,500 rpm with a homodisper, 880 g of calcium carbonate G-100 was added and stirred for 3 minutes.
Subsequently, 10 g of a curing agent Perkadox 33 (manufactured by Kayaku Nourion Co., Ltd., trade name: Perkadox 33 (purity of benzoyl peroxide: 33%) (hereinafter abbreviated as “Perkadox 33”)) was added, and Stirring was performed for 1 minute.
After the stirring of Perkadox 33 is completed, the above mixture is immediately put into a mold of 120 mm × 120 mm × 30 mm in an environment of 5 ° C., cured at 5 ° C. for 24 hours or more, and then cured at 23 ° C. 50% RH for 24 hours or more. Then, the mold is removed, the central part of the cured product of the resin composition is molded into a shape of 100 mm × 100 mm × 25 mm, and after curing at 23 ° C. 50% RH for 24 hours or more, the mass is measured and the density D2 is determined. Calculated. From the densities D1 and D2, the cure shrinkage rate of the resin composition formulation was calculated using the following formula (1).

Curing shrinkage rate (%) = [(D2-D1)/D2] × 100 Formula (1)
In the case where the aggregate precipitated immediately after blending, the curing shrinkage rate could not be measured accurately, so it was evaluated as "unmeasurable".

(hardness)
The cured product of the resin composition was molded into a shape of 100 mm × 100 mm × 25 mm as a test specimen, and after curing at 23 ° C. 50% RH for 24 hours or more, the surface hardness of the cured product of the resin composition was measured according to JIS-K6253-. The surface hardness at 23° C. was measured at 5 points with a 3N type E durometer, and the average value of the measured values was taken as the hardness.
In addition, since the exact hardness could not be measured for those in which the aggregate settled immediately after blending, it was evaluated as "unmeasurable."

(Examples 2 to 18 and Comparative Examples 1 to 9)
Evaluation was 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.

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

[Evaluation 5]
Evaluation was performed in the same manner as in Example 1, except that the type and amount of aggregate added were changed as shown in Table 5. Those results are shown in Table 5.
Abbreviations in Table 5 mean the following.
Charcoal Escalon 2000: manufactured by Sankyo Seifun Co., Ltd., trade name: heavy calcium carbonate Escalon 2000 (hereinafter abbreviated as "Charcoal Escalon 2000"), specific surface area: 22,000 cm ² /g.
KM-17A: manufactured by Ryokosha, trade name: Acrytone Floor KM-17A (hereinafter abbreviated as "KM-17A"), specific surface area: 200 cm ² /g.
· KZ-005: manufactured by Ryokosha, trade name: Acrytone Floor KZ-005 (hereinafter abbreviated as "KZ-005"), specific surface area: 40 cm ² /g.

(Example 21, Example 22)
[Evaluation 6]
Evaluation was carried out in the same manner as in Example 4, except that the temperature at which the sample was compounded was changed from -10°C in Evaluation 1 to 35°C and -15°C, and the compounding was changed as shown in Table 6. Those results are shown in Table 6.
Abbreviations in Table 6 mean the following, respectively.
- XD-631: Reaction modifier manufactured by Ryokosha, trade name: Acrysirup XD-631 (hereinafter abbreviated as "XD-631").

As shown in Tables 1 to 6, the resin composition S-1 to resin composition S-16 and Examples 1 to 22 of the present invention had a resin viscosity within a preferable range, and the coating workability was improved. It has good flash point, compound properties, and adhesive strength. It can be cured in a short time under a wide range of temperature conditions from 35°C to -15°C, and has good adhesive strength and a high flash point. and low odor.

On the other hand, as shown in Table 2, the resin composition S-17 satisfies the flash point, but the resin viscosity is high and the coating workability is poor. Comparative Example 1 used had a high formulation viscosity, poor coating workability, and poor adhesive strength and hardness.
Although the resin composition S-18 satisfies the flash point, the resin viscosity is high and the coating workability is poor. It was expensive and the coating workability was poor, and the adhesive strength was also poor.
Although the resin composition S-19 satisfies the flash point, the resin viscosity is high and the coating workability is poor. It was expensive and the coating workability was poor, and the adhesive strength was also poor.
Although the resin composition S-20 satisfies the flash point, the resin viscosity is high and the coating workability is poor. The coating workability was poor due to its high cost, and the adhesive strength was also poor due to peeling between the substrate and the layer of the resin composition blend.
Although the resin composition S-21 satisfies the flash point, the resin viscosity is too low and the coating workability is poor. Since the viscosity is too low, the aggregate component of the resin composition is sedimented and separated, resulting in poor storage stability of the resin composition. could not be evaluated.
Since the resin composition S-22 contains a large amount of MMA with a low flash point, the flash point is poor and the resin viscosity is high, resulting in poor coating workability. Comparative Example 6 used had a high formulation viscosity and poor coating workability.
Since the resin composition S-23 contains a large amount of MMA with a low flash point, the flash point is poor. The strength, cure shrinkage and hardness were good, but the composition was highly dangerous in terms of flammability.
Comparative Example 8 using the resin composition S-4 had a low amount of calcium carbonate G-100 as an aggregate, resulting in a low formulation viscosity, poor coating workability, and a long pot life. By that the bond strength was bad with separation. Moreover, the cure shrinkage rate and hardness could not be evaluated correctly.
Comparative Example 9 using the resin composition S-9 contained a large amount of calcium carbonate G-100 as an aggregate, resulting in a high formulation viscosity, poor coating workability, and a short pot life. Also long and badly the adhesion strength was poor with separation. Moreover, the cure shrinkage rate and hardness could not be evaluated correctly.

The resin composition of the present invention can be cured in a short time under a wide range of conditions from normal temperature to low temperature, and has good adhesive strength and low odor. A repair method can be provided.
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 used for civil engineering and construction materials such as coating materials, floor coating materials, road surface pavement materials, wall materials, and fillers for repair. It can be suitably used in the field and is extremely important industrially.

Claims (14)

The resin composition has a viscosity of 10 to 200 mPa s at 23 ° C. measured with a Brookfield viscometer BM type specified in JIS-Z8803, and the resin composition is mixed with an aggregate and a curing agent to obtain a JIS- The time required for the viscosity of the resin composition to reach 40,000 mPa s at −10° C. measured with a Brookfield type viscometer BM Z8803 standard is 15 to 60 minutes, and the resin composition is ignitable. A resin composition having a point of 21° C. or higher. When 100 to 400 parts of aggregate is blended with 100 parts of the resin composition, the viscosity of the resin composition is 800 to 5,000 mPa s as measured by a Brookfield viscometer BM compliant with JIS-Z8803. Item 1. The resin composition according to item 1. When the resin composition containing the aggregate and the curing agent was cast and cured on a concrete surface so that the adhesive surface was 20 mm × 20 mm and the thickness was 15 mm, the loading surface at 23 ° C. was 15 mm × 20 mm. 3. The resin composition according to claim 1 or 2, which has an adhesive strength of 0.49 MPa or more as measured by a shear test in which a load is applied as much as possible. The resin composition according to any one of claims 1 to 3, wherein the aggregate and curing agent are blended at -15 to 35°C. Density D1 of an aggregate-containing resin composition obtained by blending 100 to 400 parts of aggregate with respect to 100 parts of the resin composition, measured by a method in accordance with JIS-K5600 2-4. After pouring the resin composition into a mold with inner dimensions of 120 mm wide × 120 mm long × 30 mm high and curing and curing, the resin composition containing the aggregate was cut into a size of 100 mm wide × 100 mm long × 25 mm high. The resin composition according to any one of claims 1 to 4, wherein the curing shrinkage calculated by the following formula (1) from the density D2 calculated from the mass of the cured product is 5% or less.
Cure shrinkage rate (%) = [(D2-D1) / D2] × 100 Equation (1)
In the formula (1), "D1" is the density of the liquid aggregate-containing resin composition measured by a method conforming to JIS K 5600 2-4, and "D2" is the density of the aggregate-containing resin composition. It is the density of the cured product. Any one of claims 1 to 5, wherein the surface hardness of the cured product of the aggregate-containing resin composition is 80 to 99 at 23 ° C. measured with a type E durometer specified in JIS-K6253-3. The resin composition according to Item. The resin composition according to any one of claims 1 to 6, wherein the resin composition contains a compound having a polymerizable double bond. The resin composition according to any one of claims 1 to 7, which is used for pouring into a defective portion when repairing a defective portion of a cement asphalt mortar layer of a slab track. 9. The resin composition according to claim 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 17 carbon atoms. The resin composition according to any one of claims 7 to 9, 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. The resin composition according to any one of claims 7 to 10, wherein the compound having a polymerizable double bond is a polyfunctional (meth)acrylate. The resin composition according to any one of claims 1 to 11, further comprising a (meth)acrylic polymer. The resin composition according to any one of claims 7 to 12, wherein the compound having a polymerizable double bond contains a monomer having a solubility parameter of 9.5 (cal/cm ³ ) ^1/2 or more. A method for repairing a cement asphalt mortar layer of a slab track by injecting the resin composition according to any one of claims 1 to 13 into the cement asphalt mortar layer of the slab track and then curing the same.