JP2001164152A - Coating material for cement asphalt mortar and repairing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cement asphalt coating material and a repairing material which is well and simply applicable to the execution at a low temperature of <=5 deg.C. SOLUTION: The cement asphalt mortar coating material comprises (A) 50-95 pts. mass (meth)acrylic ester monomer, (B) 5-50 pts. mass polymer soluble in monomer (A) and/or oligomer having a (meth)acryloyl group, and (C) 0-30 pts. mass [based on 100 pts. mass of the sum of component (A) and component (B)] plasticizer as the major components. The repairing material uses a reinforcing material, aggregate, a cement asphalt molding material in addition to this coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, the vertical vibration of a cement asphalt mortar (hereinafter referred to as CA mortar) provided as a filling layer of a railway slab track when passing through a train. The present invention relates to an acrylic resin-based coating material and a repair material used to prevent scattering of mortar caused by weathering or the like, prevent mortar crushed by weathering or the like, or prevent frost damage.

[0002]

2. Description of the Related Art CA mortar is used for the filling of railway slab tracks for the purpose of labor saving of maintenance.
However, in recent years, scattering of CA mortar due to deterioration such as vibration load, rainwater, weathering, and frost damage when passing a train has become a problem. In order to prevent such scattering, it is necessary to repair the side surface of the filling layer.

For this repair, a solventless two-liquid curing type epoxy liquid resin, urethane liquid resin, CA mortar, or the like is used. Among these, the epoxy liquid resin and the urethane liquid resin increase in viscosity with a decrease in temperature, and particularly in winter, workability is reduced and construction is difficult. Therefore, it is necessary to heat the resin in winter when the temperature is low to lower the viscosity or shorten the curing time. Furthermore, the epoxy liquid resin is cured by a reaction between an amine (curing agent) and an epoxy group in the epoxy prepolymer. By adjusting the amount of the curing agent and the amount of the prepolymer, heat generated during curing is generated. It is necessary to reduce the amount and the amount of shrinkage and to maintain a proper pot life. The urethane liquid resin is composed of a polyol and (poly)
It is cured by reaction with isocyanate,
By adjusting the amount of the polyol and the amount of the (poly) isocyanate, it is necessary to reduce the amount of shrinkage during curing and maintain an appropriate pot life.

[0004]

In the case of heating a material in winter when the temperature is low, equipment such as a jet heater must be prepared, and moreover, time is required for heating. It is difficult to complete construction in a short time. Particularly, the CA mortar to be repaired has a large specific heat and is therefore difficult to be heated. In addition, when two-part curing type liquid resins such as epoxy resin and urethane resin are heated and then coated, the resin temperature immediately drops, and as a result, it takes a long time to cure. May not cure completely.

[0005] CA mortar to be repaired is
Residual water from rainwater intrusion may be present on the surface. In this case, in the case of a urethane liquid resin having a property of foaming in response to water, flow inhibition due to foaming and a decrease in strength after curing occur. Furthermore, CA as repair material and coating material
When using mortar, 5 ℃
It cannot be used under the following low temperatures.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above and to prevent scattering of CA mortar used for filling of railroad slab tracks, rainwater intrusion, and frost damage prevention. It is an object of the present invention to provide a CA mortar coating material and a repair material that can be easily and easily performed at a low temperature of 5 ° C. or less.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, an acrylic resin composition having a specific component has been used for filling a railroad slab track. The present invention was found to be extremely excellent as a coating material and a repair material for the side surfaces of the CA mortar to be obtained, and the present invention was completed.

That is, the present invention relates to 30 to 95 parts by mass of a (meth) acrylate monomer (A), a polymer dissolved in the monomer (A) and / or an oligomer (B) having a (meth) acryloyl group. 70 parts by mass and 0 to 30 parts by mass of the plasticizer (C) [however, the component (A)
And 100 parts by mass of the component (B) in total] as a main component.

Further, the present invention provides a coating material comprising:
It is a repair material for cement asphalt mortar using at least one reinforcing material selected from the group consisting of glass fiber, carbon fiber, nonwoven fabric and net.

[0010] The present invention further provides the coating material,
An aggregate and / or a cement asphalt molding material, wherein the total amount of the aggregate and / or the cement asphalt molding material is equal to the component (A), component (B) and component (C) of the coating material. The repair material for cement asphalt mortar is 10 to 300 parts by mass based on 100 parts by mass in total.

In the present invention, "(meth) acryl" means "acryl and / or methacryl".

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below.

The (meth) acrylate monomer (A) used in the present invention is a component that imparts curability and solubility to the coating material of the present invention. As a specific example,
Methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate,
T-butyl (meth) acrylate, (meth) acrylic acid 2
-C1-C1 of (meth) acrylic acid such as ethylhexyl
8 alkyl esters; hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate,
Hydroxyl-containing monomers such as hydroxybutyl (meth) acrylate; dimethylaminoethyl (meth) acrylate,
Nitrogen-containing monomers such as diethylaminoethyl (meth) acrylate; glycidyl (meth) acrylate, (meth)
Functional group-containing monomers such as tetrahydrofurfuryl acrylate and morpholyl (meth) acrylate; alicyclic (meth) acrylates such as isobornyl (meth) acrylate and cyclohexyl (meth) acrylate; A monomer having one (meth) acryloyl group is exemplified. As the (meth) acrylate monomer (A), one type may be used alone, or two or more types may be used in combination. In particular, it is preferable to use methyl methacrylate in combination with 2-ethylhexyl (meth) acrylate from the viewpoint of workability, curability, and adhesiveness.

Further, in order to improve the curability and the physical properties of the cured product, the monomer having one (meth) acryloyl group in the molecule and, if necessary, two or more (meth) acryloyl groups, if necessary. Crosslinkable (meth) acrylate monomers can be used. Specific examples thereof include ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, and pentaerythritol tri (meth) acrylate. Examples thereof include (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and tris (ethyloxy (meth) acrylate) isocyanurate. Also,
By using a cross-linking monomer other than the (meth) acrylic acid ester monomer (A), curability, physical properties of a cured product, and the like can be improved. If necessary, a monomer having a vinyl group such as styrene or vinyltoluene may be used as long as the performance of the coating material of the present invention is not hindered.

The polymer soluble in the monomer (A) and / or the oligomer (B) having a (meth) acryloyl group used in the present invention adjusts the viscosity and curing time of the coating material of the present invention, It is a component that improves physical properties and durability.

Among the components (B), the polymer soluble in the monomer (A) [hereinafter referred to as the polymer (B)] does not cause any problem in the curability of the coating material and the physical properties of the cured product. Any polymer can be used. Preferred polymers (B) include (meth) acrylate polymers or copolymers. As the polymer or copolymer of the (meth) acrylate, one kind may be used alone, or two or more kinds may be used in combination. (Meth) used for the production of this polymer (B)
As specific examples of the acrylate, the component (A)
Various monomers mentioned as specific examples of the above are exemplified. Particularly preferred are methyl (meth) acrylate, ethyl (meth) acrylate, and n- (meth) acrylate.
C1-C18 alkyl esters of (meth) acrylic acid such as -propyl, isopropyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate Kind;
Benzyl (meth) acrylate; and the like. Of these various (meth) acrylates, one type may be used as a homopolymer, or two or more types may be used as a copolymer.

Further, a copolymer obtained by copolymerizing (meth) acrylic acid ester and another monomer can be used as the polymer (B). Other monomers include, for example, acid-containing monomers such as (meth) acrylic acid, itaconic acid, maleic acid, and (meth) acryloyl phosphate; aromatic monomers such as styrene and α-methylstyrene; and (meth) acrylonitrile. A cyano group-containing monomer; vinyl monomers such as vinyl acetate and vinyl chloride;
And the like. In addition, a styrene / butadiene copolymer, a vinyl chloride / vinyl acetate copolymer, a cellulose acetate butyrate resin, an epoxy resin, and the like can also be used as the polymer (B).

Specific examples of the oligomer having a (meth) acryloyl group in the component (B) [hereinafter referred to as oligomer (B)] include polybasic acids such as phthalic acid, adipic acid and maleic acid, and ethylene glycol. Poly (meth) acrylate obtained by the reaction of polyhydric alcohols such as propylene glycol and butanediol with (meth) acrylic acid; epoxy poly (meth) obtained by the reaction of various epoxy resins with (meth) acrylic acid Acrylates; urethane poly (meth) acrylates obtained by reacting various polyols and various polyisocyanates with hydroxyl group-containing monomers such as 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate;

The molecular weight of the polymer and oligomer as the component (B) may be appropriately selected so as to obtain the desired viscosity, curing time, physical properties of the cured product and the like in the coating material, and is not particularly limited in the present invention. . However, the weight average molecular weight of the polymer (B) is preferably about 5,000 to 150,000, and more preferably about 10,000 to 100,000. The oligomer (B) has a weight average molecular weight of 2,2.
About 000-50,000 is preferable, and 3,000-4
It is more preferably about 000.

The amounts of component (A) and component (B) used are as follows:
Based on a total of 100 parts by mass of the component (A) and the component (B), 30 to 95 parts by mass of the component (A) and 5 to 70 parts by mass of the component (B)
Parts by weight. When the amount of the component (A) is less than 30 parts by mass and the amount of the component (B) exceeds 70 parts by mass, the workability tends to be poor because the viscosity is generally high and the curing time is too short. When the amount of the component (A) exceeds 95 parts by mass and the amount of the component (B) is less than 5 parts by mass, not only does the curability generally deteriorate, but also the adhesion to the CA mortar deteriorates. In particular, component (A) 50 to 80 parts by mass, component (B) 20 to 5
It is preferably 0 parts by mass.

[0021] The plasticizer (C) used in the present invention is a component that is blended as required, and is a component that imparts flexibility to the cured product and reduces shrinkage and shrinkage stress during curing. Specific examples thereof include phthalate plasticizers such as diethyl phthalate, di-n-butyl phthalate, diheptyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate, diisodecyl phthalate, and ditridecyl phthalate; adipic acid Aliphatic dibasic acid esters such as dioctyl, diisodecyl adipate, dioctyl azephinate, dibutyl sebacate, dioctyl sebacate; tricresyl phosphate, triphenyl phosphate, tri-2 phosphate
-Phosphate plasticizers such as ethylhexyl; epoxy plasticizers such as epoxidized triglycerite, epoxidized soybean oil, epoxidized linseed oil; polyesters such as sebacic polyester, adipic polyester, and phthalic polyester. Plasticizers; chlorinated paraffin plasticizers such as various chlorinated normal paraffins; and the like. These may be used alone or in combination of two or more. Among them, a phthalate plasticizer and a chlorinated normal paraffin plasticizer are preferable.

The amount of the plasticizer (C) used is not more than 30 parts by mass based on 100 parts by mass of the total of the components (A) and (B). If the amount exceeds 30 parts by mass, the curability will deteriorate. Particularly, the amount is preferably 5 to 25 parts by mass.

The coating material of the present invention contains the above components (A), (B) and (C) as main components. Further, if necessary, a paraffin wax for improving the surface curability at the time of curing, a silane coupling agent for improving the adhesion to the base, an ultraviolet absorber such as a benzotriazole derivative, a hindered amine-based light stabilizer Agents, antioxidants, polymerization inhibitors such as hydroquinone, defoamers, leveling agents, thixotropic agents, inorganic pigments such as chromium oxide, red iron oxide, iron oxide, etc., organic pigments such as phthalocyanine blue, anti-settling agents, etc. Can be added at a ratio of In addition, from the point of workability,
The viscosity of the coating material of the present invention is preferably 4,000 mPa · S or less.

In order to cure the coating material of the present invention, for example, a known redox catalyst using a combination of a polymerization initiator and an accelerator is used. Specific examples of the polymerization initiator include diacyl peroxide, alkyl peroxide, ketone peroxide and the like. Among these, diacyl peroxide is preferred, and benzoyl peroxide is particularly optimal. As the accelerator, an aromatic tertiary amine is preferred. Specific examples include N,
N-dimethylaniline, N, N-dimethyl-p-toluidine, N, N-diethyl-p-toluidine, N, N-di (hydroxyethyl) -p-toluidine, N, N-di (hydroxypropyl) -p -Toluidine and the like. These may be used alone or in a combination of two or more. The coating material of the present invention comprises CA
It can be suitably used for the purpose of preventing mortar from scattering, preventing rainwater from entering, and preventing frost damage. For example, subgrade concrete 1, CA mortar filling 2, as illustrated in FIG.
In the model of the slab track composed of the track slab 3 and the rail 4, the coating material of the present invention is applied to the four side surfaces (A surface, B surface, C surface, and D surface) of the CA mortar filler layer 2 and cured. It should be done. Considering the heat generated during curing,
The thickness of the coating cured layer is preferably 30 mm or less, and 20 m
The thickness is more preferably not more than m.

Note that CA mortar has a high water absorption and is liable to be degraded by freezing of contained water at low temperatures. From such a point, the cured product of the coating material of the present invention preferably has a water absorption of 10% or less after immersion in water at 20 ° C. for 90 days. Further, the cured product preferably has an adhesive strength to CA mortar of 1 MPa or more and a compressive strength of 3.5 MPa or more. In addition, when used for a railway slab track, it is preferable that the curing time be as short as possible, and considering the workability and the like, the curing time of the coating material is preferably 1 hour or less.

The surface A and the surface B of the CA mortar
When the surface, C surface, and D surface are repaired, (1) a repair material containing the coating material and an aggregate and / or cement asphalt molding material, or (2) a glass fiber is added to the coating material. It is highly preferable to use as a repair material using one or more reinforcing materials selected from the group consisting of carbon fiber, nonwoven fabric and net.

When an aggregate or a cement asphalt molding material is blended, the curability and strength are further improved. Specific examples thereof include extender pigments such as calcium carbonate powder, silicon oxide powder, aluminum hydroxide powder, calcium sulfate powder, aluminum oxide powder, barium sulfate powder, silica sand, crushed stone, and 3 mm diameter.
Cobblestone having a diameter of about 10 to 10 mm and a CA mortar molding having a diameter of about 5 to 10 mm are exemplified. The amount used is 10 to 300 parts by mass based on 100 parts by mass in total of the component (A), the component (B) and the component (C). When the amount is less than 10 parts by mass, the effect of improving curability and strength tends to be insufficient, and when the amount exceeds 300 parts by mass,
Workability tends to deteriorate.

When one or more reinforcing materials selected from the group consisting of glass fiber, carbon fiber, nonwoven fabric and net are used, the physical properties of the repair material are further improved. The specific types of these reinforcing materials are not particularly limited, and various fibers, nonwoven fabrics and nets conventionally used can be used.

[0029]

The present invention will be described in more detail with reference to the following examples. In the following description, “parts” means “parts by mass” unless otherwise specified. Each evaluation was performed according to the following test methods.

<Specimen> As a specimen, C having the following composition was used.
A mortar was used.

Early-strength cement: Onoda Co., Ltd. Admixture: Denka Kagaku Kogyo Co., Ltd., Electrified AM Fine aggregate: River sand having a particle size of 2.5 mm or less Defoaming agent: Toshiba Silicone Co., Ltd., TSA730 AE agent: Yamamune The surface of Vinsol CA mortar manufactured by Kagaku Co., Ltd. was sanded with sandpaper, a coating material to be evaluated was applied to this surface, and the material cured at 20 ° C. was subjected to evaluation except for evaluation of curability. . [Water absorption] 30 × 50 × 75 mm in an atmosphere of 20 ° C.
The coating material was applied and cured to a thickness of 1 mm on the entire surface of the test specimen of CA mortar, and immersed in water at 20 ° C. for 90 days. ) / Mass before immersion × 100 (%) ”. The target level of the water absorption was set to 10% or less. [Adhesive strength] On a 50 × 50 × 15 mm concrete plate, load loading surface 15 × 20 mm, adhesive surface 20 × 20 mm
In the size of, fix the test piece with the compound cast and bonded,
A load is applied to the loading surface using a universal material testing machine, and the adhesive strength between the hardened compound and the concrete plate is measured.
If the above adhesive strength was obtained, it was judged as acceptable. [Compressive strength] The compressive strength was measured according to JIS R-5021, and if the compressive strength was 3.5 MPa or more, it was judged as acceptable. [Viscosity] Using a BM type device manufactured by Tokimec, water temperature 20
The B-type viscosity was measured at ° C. 4,000 from the point of workability
Those having a viscosity of mPa · S or less were accepted. [Curability] The curing time at a curing temperature of 20 ° C. and 5 ° C. was measured, and the degree of curing was judged by finger touch. The details are described in the text of the examples below. The curability is 60
Minutes were considered acceptable.

Example 1 47 parts of methyl methacrylate
18 parts of 2-ethylhexyl methacrylate, 2 parts of triethylene glycol dimethacrylate, 6 parts of dioctyl phthalate, 13 parts of chlorinated paraffin (trade name: Toyoparax 150, manufactured by Tosoh Corporation), methyl methacrylate / n-butyl methacrylate = 70 / 30 (Mw 30,000) copolymer, 20 parts of methyl methacrylate / n-methacrylic acid
Butyl = 60/40 (Mw 14,000) copolymer 13
Parts, paraffin wax (melting point 57 ° C) 0.8 parts, N, N
-Di (2-hydroxypropyl) -p-toluidine
Six parts were dissolved at 50 ° C. for 2 hours and cooled to obtain a resin solution. To 100 parts of this resin solution, 50 parts of calcium carbonate (trade name A, manufactured by Sankyo Milling Co., Ltd.) was added, and 1 part of a thixotropic agent (trade name, Aerosil 200, manufactured by Nippon Aerosil Co., Ltd.) was added, followed by stirring and mixing. , A formulation was obtained. At room temperature 20 ° C., 1 part of a 50% curing agent benzoyl peroxide (to the resin solution) was added to the mixture,
A side surface of a × 100 × 100 mm CA mortar specimen was painted with a brush to a thickness of 1 mm and cured. The upper and lower parts of the obtained CA mortar-coated product were covered with concrete plates and exposed outdoors for 6 months. No abnormality such as cracking or peeling was observed in the cured product. When a similar test was conducted under the condition of 5 ° C. and 4 parts of a 50% benzoyl peroxide curing agent was added, similar good results were obtained.

Example 2 44 parts of methyl methacrylate,
17 parts of 2-ethylhexyl acrylate, 2 parts of triethylene glycol dimethacrylate, 22 parts of chlorinated paraffin (Toyoparax 150), methyl methacrylate / n-butyl methacrylate = 60/40 (Mw 42000)
37 parts of copolymer, paraffin wax (melting point 57 ° C)
0.75 parts, N, N-di (2-hydroxypropyl) -p
Toluidine (0.25 parts) and N, N-dimethyl-p-toluidine (0.25 parts) were added and dissolved at 50 ° C. for 2 hours, followed by cooling to obtain a resin solution. For 100 parts of this resin solution,
Calcium carbonate (manufactured by Takehara Chemical Industries, trade name SL-7
00), and thixotropic agent (N
3 parts of Benton SD-2) manufactured by L Chemicals Co., Ltd. were added to obtain a blend. To the resulting mixture, 2 parts of a 50% curing agent benzoyl peroxide (to the resin solution) was added, and the same test (20 ° C.) as in Example 1 was performed thereafter. No abnormality such as cracking or peeling was observed in the cured product.
When a similar test was conducted at 5 ° C. and 5 parts of a 50% benzoyl peroxide curing agent was added, similar good results were obtained.

Example 3 47 parts of methyl methacrylate
20 parts of 2-ethylhexyl methacrylate, 13 parts of polybutadiene-modified urethane acrylate (trade name: BR-45UAT, manufactured by Light Chemical Company), 3 parts of trimethylolpropane triacrylate, styrene / butadiene copolymer (trade name: TR-, manufactured by JSR Corporation) 2000) 17 parts, chlorinated paraffin (Toyoparax 150) 20 parts, dioctyl phthalate 3 parts, paraffin wax (melting point 57
C) 0.8 parts, N, N-di (2-hydroxypropyl)-
0.6 parts of p-toluidine and 0.4 parts of N, N-dimethyl-p-toluidine were added, dissolved at 50 ° C. for 2 hours, and cooled to obtain a resin solution. For 100 parts of this resin solution,
Calcium carbonate (G-100 manufactured by Sankyo Flour Milling Co., Ltd.)
130 parts were added, and 3 parts of a thixotropic agent (Benton SD-2) was further added to obtain a blend. To the obtained mixture, 1.5 parts of a 50% benzoyl peroxide curing agent (based on the resin solution) were added, and thereafter the same test as in Example 1 (2
0 ° C.). No abnormality such as cracking or peeling was observed in the cured product. When the same test was conducted at 5 ° C. under the condition of adding 5 parts of a 50% benzoyl peroxide curing agent, similar good results were obtained.

Example 4 46 parts of methyl methacrylate
13 parts of 2-ethylhexyl methacrylate, 2 parts of triethylene glycol dimethacrylate, methyl methacrylate / n-butyl methacrylate = 60/40 (Mw 1400
0) 39 parts of copolymer, 22 parts of dioctyl phthalate, 0.7 part of paraffin wax (melting point 57 ° C.), N, N-di (2
-Hydroxypropyl) -p-toluidine 0.6 part, N,
0.3 part of N-dimethyl-p-toluidine was added and 50 parts were added.
The mixture was dissolved at 2 ° C. for 2 hours and cooled to obtain a resin solution. To 100 parts of this resin solution, calcium carbonate (G-1)
00), and 3 parts of a thixotropic agent (Benton SD-2) was added to obtain a blend. Add 50% benzoyl peroxide curing agent to this formulation 1.
Five parts (to the resin solution) were added, and thereafter the same test (20 ° C.) as in Example 1 was performed. No abnormality such as cracking or peeling was observed in the cured product. When the same test was conducted at 5 ° C. under the condition of adding 5 parts of a 50% benzoyl peroxide curing agent, similar good results were obtained.

Example 5 55 parts of methyl methacrylate,
20 parts of 2-ethylhexyl acrylate, 2 parts of triethylene glycol dimethacrylate, methyl methacrylate / n-butyl acrylate = 90/10 (Mw 68,00
0) 23 parts of copolymer, 6 parts of dioctyl phthalate, 0.6 part of paraffin wax (melting point 57 ° C.), N, N-di (2-
(Hydroxypropyl) -p-toluidine 0.5 part, N, N
-Dimethyl-p-toluidine (0.3 part),
It was dissolved in 2 hours and cooled to obtain a resin solution. To 100 parts of this resin solution, calcium carbonate (G-10)
0) was added, and 3 parts of a thixotropic agent (Benton SD-2) was further added to obtain a blend. To this mixture was added 1.5 parts of a 50% benzoyl peroxide curing agent (to the resin solution), and the same test as in Example 1 was repeated (2).
0 ° C.). No abnormality such as cracking or peeling was observed in the cured product. When the same test was conducted at 5 ° C. under the condition of adding 5 parts of a 50% benzoyl peroxide curing agent, similar good results were obtained.

Example 6 18 parts of methyl methacrylate
35 parts of n-butyl acrylate, 5 parts of trimethylolpropane trimethacrylate, 42 parts of a methyl methacrylate / n-butyl methacrylate = 60/40 (Mw 14,000) copolymer, 1 part of paraffin wax (melting point 57 ° C.)
And 1 part of N, N-di (2-hydroxypropyl) -p-toluidine were added, dissolved at 50 ° C. for 2 hours, and cooled to obtain a resin solution. For 100 parts of this resin solution,
100 parts of calcium carbonate (G-100) was added, and 1 part of a thixotropic agent (Aerosil 200) was further added to obtain a blend. To the resulting blend, 2 parts of a 50% benzoyl peroxide curing agent (to the resin solution) was added, and the same test (20 ° C.) as in Example 1 was performed thereafter. No abnormality such as cracking or peeling was observed in the cured product.
When the same test was conducted at 5 ° C. under the condition of adding 5 parts of a 50% benzoyl peroxide curing agent, similar good results were obtained.

Example 7 At room temperature and 20 ° C., the composition obtained in Example 1 was added with a curing agent benzoyl peroxide 50%
One part of the product was added, and a glass mat (manufactured by Asahi Fiber Glass Co., Ltd., trade name CM-305) was used as a reinforcing material on the side surface of a 100 × 100 × 100 mm CA mortar specimen, and the resultant was coated with a roller and then defoamed with a defoaming roller. Defoamed and cured. The upper and lower parts of the obtained CA mortar-coated product were covered with concrete plates and exposed outdoors for 6 months. No abnormality such as cracking or peeling was observed in the cured product.
When the same test was conducted at 5 ° C. under the condition of adding 5 parts of a 50% benzoyl peroxide curing agent, similar good results were obtained.

<Eighth Embodiment> 130 parts of calcium carbonate (G-100) was added to 100 parts of the resin solution of the third embodiment, and 3 to 5 m.
100 parts of m-size cobble stones were added and mixed to obtain a repair material. At room temperature and 20 ° C., 2 parts of a 50% benzoyl peroxide curing agent (to the resin solution) were added to the repair material, and
A mold was provided on a side surface of a test piece of CA mortar of 0 × 100 × 100 mm so that a gap of 20 mm was formed, and a repair material was poured into the gap to obtain a molded material. The upper and lower parts of this molding were covered with a concrete plate and exposed outdoors for 6 months. No abnormalities such as cracks and peeling were observed in the molded material. The compressive strength of the cured repair material is 11.2.
MPa. When a similar test was conducted under the condition of 5 ° C. and 4 parts of a 50% benzoyl peroxide curing agent was added, similar good results were obtained.

Comparative Example 1 Epoxy resin (manufactured by Asahi Denka Co., Ltd.)
67 parts of a main agent (EP-4523), a curing agent (EH-22)
6C) 33 parts were mixed to obtain a resin solution. To 100 parts of the obtained resin solution, calcium carbonate (trade name A)
50 parts were further added, and 1 part of a thixotropic agent (Aerosil 200) was further added to obtain a mixture having a B-type viscosity of 620 mPa · S. At room temperature 20 ° C., 100 ×
One side of a 100 × 100 mm CA mortar specimen
It was painted with a brush to a thickness of mm. After 2 hours, a cured product was obtained. The upper and lower parts of the cured product were covered with a concrete plate and exposed outdoors for 6 months. Cracks in the cured product,
Peeling occurred and the coating film was yellowed. When the same test was performed under the condition of 5 ° C., it was not cured even after 2 hours.

<Comparative Example 2> 24 parts of methyl methacrylate,
1 part of triethylene glycol dimethacrylate, 18 parts of dioctyl phthalate, 75 parts of a methyl methacrylate / n-butyl methacrylate = 60/40 (Mw 14000) copolymer, 0.6 part of paraffin wax (melting point 57 ° C.),
0.2 parts of N, N-di (2-hydroxypropyl) -p-toluidine and 0.2 parts of N, N-dimethyl-p-toluidine were dissolved at 50 ° C. for 2 hours to obtain a resin solution. To 100 parts of this resin solution, calcium carbonate (SL-7)
00), and 3 parts of a thixotropic agent (Benton SD-2) was added to obtain a blend. But,
The B-type viscosity was as high as 3,4000 mPa · S, and painting with a brush could not be performed.

Comparative Example 3 68 parts of methyl methacrylate
27 parts of 2-ethylhexyl acrylate, 3 parts of triethylene glycol dimethacrylate, dioctyl phthalate 1
8 parts, methyl methacrylate / n-butyl methacrylate = 60/40 (Mw 42,000) copolymer 2 parts, paraffin wax (melting point 57 ° C.) 0.6 parts, N, N-di (2
-Hydroxypropyl) -p-toluidine 0.2 part, N,
0.2 part of N-dimethyl-p-toluidine was dissolved at 50 ° C. for 2 hours to obtain a resin solution. 40 parts of calcium carbonate (SL-700) was added to 100 parts of the resin solution, and a thixotropic agent (Benton SD-
2) 3 parts were added and mixed with stirring to obtain a blend. Room temperature 20 ° C
The curing agent benzoyl peroxide 50
% Product (resin resistant solution), 100 × 100 × 10
The side of the 0 mm CA mortar specimen was painted with a brush so as to have a thickness of 1 mm. However, it did not cure even after 1 hour.

<Evaluation Results> The compositions and evaluation results of each of the examples and comparative examples are shown in Table 1 below.

[0044]

[Table 1] As is clear from the results shown in Table 1, the coating materials and the repair materials of Examples 1 to 8 showed good results in each physical property. On the other hand, Comparative Example 1 using an epoxy resin was inferior in low-temperature curability and weather resistance, and Comparative Example 2 in which the component (B) was too large.
Comparative Example 3 in which the viscosity was high and the workability was inferior and the component (B) was too small was inferior in curability.

[0045]

As described above, the coating material and the repair material for CA mortar of the present invention have curability, workability,
It is excellent in mechanical strength such as water absorption resistance, compressive strength, adhesive strength, weather resistance, and construction that requires quick curing in a short time,
It can be used favorably in construction at low-temperature curing at about 5 ° C. and construction requiring weather resistance.

Since the coating material and the repair material for CA mortar of the present invention exhibit the above-mentioned excellent properties, for example, the CA mortar used for the filling of railroad slab tracks and the like can be prevented from scattering on the side of CA mortar and entering rainwater. When used for prevention and frost damage prevention, construction at a low temperature of 5 ° C. or less can be performed favorably and easily.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an example of a slab trajectory model.

[Explanation of symbols]

 1 Roadbed concrete 2 CA mortar (filling layer) 3 Track slab 4 Rail

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor ▲ Taka ▼ Mikio Su 4-160 Sunadabashi, Higashi-ku, Nagoya-shi, Aichi F-term in the Mitsubishi Rayon Co., Ltd. Product Development Laboratory (Reference) 4J002 AE05X BG04W BG041 BG05W BG051 BG06W BG061 CD16X CD20W CD201 CF03X CF27W CF271 CK02W CK021 DA018 DL008 EH076 EH087 EH147 EN096 EU196 EU236 EW047 FA048 FD010 FD018 FD02X FD027 FD140 GH00 GL00 4J027 AB10 AB18 AB23 AB24 AE01 BA12 BA02 BA22 BA22 BA22 BA22 ABA CA02 CA03 CA04 CA05 CA06 CA10 CA14 CA16 CA18 CA24 CA27 CA29 CA36 CB03 CC01 CD08 4J038 CB172 CG141 CG142 CH031 CH032 CH041 CH042 CH081 CH082 DB242 DB262 FA121 FA122 FA131 FA151 FA152 FA161 FA162 FA171 FA172 FA182 FA231 P24JA05 P14

Claims (3)

[Claims] (1) 30 to 95 parts by mass of a (meth) acrylic acid ester monomer (A), 5 to 70 parts by mass of a polymer soluble in the monomer (A) and / or an oligomer (B) having a (meth) acryloyl group, And plasticizer (C)
A coating material for cement asphalt mortar comprising, as a main component, 0 to 30 parts by mass (based on a total of 100 parts by mass of component (A) and component (B)). 2. A repair material for cement asphalt mortar, comprising using the coating material according to claim 1 with at least one reinforcing material selected from the group consisting of glass fiber, carbon fiber, nonwoven fabric and net. 3. The coating material according to claim 1, which comprises an aggregate and / or a cement asphalt molded material, wherein the total amount of the aggregate and / or the cement asphalt molded material is equal to or less than that of the coating material. A repair material for cement asphalt mortar, which is 10 to 300 parts by mass based on a total of 100 parts by mass of the components (A), (B) and (C).