JP5134947B2 - Syrup composition, cured product thereof and coating method - Google Patents

Description

  The present invention relates to a syrup composition suitable for a drainable topcoat, a cured product thereof, and a method for coating a construction surface using the syrup composition.

Conventionally, a curable composition containing a vinyl monomer having an alicyclic structure and a methacrylic polymer having a number average molecular weight of 1,000 to 20,000 (see, for example, Patent Document 1) or polymerization in a civil engineering building coating. A resin composition containing a (meth) acrylic polymer having a polymerizable double bond and a polymerizable monomer (see, for example, Patent Document 2) is used.
JP 2002-114830 A JP 2002-020440 A

Specifically, in Production Example 1 of Patent Document 1, methyl methacrylate, n-butyl acrylate, and acrylic acid are polymerized to obtain vinyl polymer B-1, and the vinyl polymer B-1 and glycidyl methacrylate are obtained. To obtain a methacryloyl group-containing vinyl polymer C-1, and a mixture of the methacryloyl group-containing vinyl polymer C-1, dicyclopentenyloxyethyl methacrylate, trimethylolpropane triacrylate, and paraffin wax. Although D-1 is described, since the composition has a high viscosity, the coating workability is poor, and the strength of the cured product is inferior.
In Synthesis Example 1 of Patent Document 2, a polymer is obtained by polymerizing methyl methacrylate and methacrylic acid, and a polymer is obtained by esterifying glycidyl methacrylate to the obtained polymer. Although methacrylic syrup (1) to which tert-butyl methacrylate and a wax are added is described, the methacrylic syrup has a high viscosity, so that the coating workability is poor.

  An object of the present invention is to provide a syrup composition having a low viscosity, good coating workability, high strength of a cured product and excellent durability at high temperatures, a cured product of the syrup composition, and the syrup composition. It is to provide a coating method using an object.

The present invention includes the following aspects.
[1] Polymer (B) 20 to 40 having 60 to 80% by mass of an acrylic monomer (A) having no alicyclic structure and a butyl methacrylate unit or isobornyl (meth) acrylate unit and having a double bond The syrup composition which contains 0.1-5 mass parts of wax (C) with respect to 100 mass parts of syrup (X) containing a mass%.
[2] A cured product of the syrup composition of [1].
[3] A drainable top coat comprising the cured product of [2].

[4] The syrup composition according to [1], further including 5 to 70 parts by mass of light-reflective particles with respect to 100 parts by mass of the syrup (X).
[5] A heat-shielding top coat comprising a cured product of the syrup composition of [4].
[6] A coating method including a step of applying the syrup composition of [1] or [4] to a construction surface to form a coating film.

The syrup composition of the present invention has a low viscosity and is excellent in coating workability.
The cured product of the syrup composition of the present invention has high strength and excellent durability at high temperatures.
The drainable top coat comprising the cured product of the syrup composition of the present invention has high strength and excellent durability at high temperatures.
The heat-insulating topcoat made of a cured product of the syrup composition of the present invention has heat-insulating properties, high strength, and excellent durability at high temperatures.
According to the coating method using the syrup composition of the present invention, a cured product having high strength and excellent durability under high temperature can be obtained in a short time.

  The syrup (X) in the present invention is a polymer (B) having an acrylic monomer (A) having no alicyclic structure, a butyl methacrylate unit or an isobornyl (meth) acrylate unit, and having a double bond. ).

<Acrylic monomer (A)>
Examples of the acrylic monomer (A) having no alicyclic structure include monofunctional acrylic monomers and polyfunctional acrylic monomers. Either of these may be used, or both may be used in combination. When an acrylic monomer having an alicyclic structure is used, the viscosity of syrup is increased and the coating workability and the self-leveling property are deteriorated. In addition, the strength of the cured product is reduced, and it becomes easy to peel off from the asphalt pavement surface.

  The monofunctional acrylic monomer is a (meth) acrylate having only one (meth) acryloyl group, and the polyfunctional acrylic monomer is a (meth) acrylate having two or more (meth) acryloyl groups. . In the present invention, “(meth) acrylate” means “acrylate” and / or “methacrylate”, and “(meth) acryloyl group” means “acryloyl group” and / or “methacryloyl group”.

Monofunctional acrylic monomers are coating workability and curability of the syrup composition containing syrup (X), strength of the resulting coating film, weather resistance, chemical resistance, stain resistance, abrasion resistance It is a component involved in various physical properties such as.
Monofunctional acrylic monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl ( (Meth) acrylic acid alkyl esters such as (meth) acrylate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, etc. Hydroxyl group-containing (meth) acrylates; nitrogen-containing (meth) acrylates such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate; tetrahydrofurfuryl (meth) acrylate, glycidyl (meth) acrylate and the like Having a functional group which does not participate in the radical polymerization (meth) acrylates and the like.
These monofunctional acrylic monomers may be used alone or in combination of two or more.

A polyfunctional acrylic monomer is a component involved in the coating workability of the syrup composition containing syrup (X), the heat resistance of the resulting coating film, and the strength.
As polyfunctional acrylic monomers, alkanediol di (meth) acrylates such as ethylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, and 1,6-hexanediol di (meth) acrylate Polyoxyalkylene glycol di (meth) acrylates such as diethylene glycol di (meth) acrylate and polytetramethylene glycol di (meth) acrylate; neopentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol Tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, isocyanuric acid tris [ethyloxy (meth) acrylate] Trifunctional or more (meth) acrylic acid ester or a partial ester of such glycerin tri (meth) acrylate; and the like.
A polyfunctional acrylic monomer may be used individually by 1 type, and may use 2 or more types together.

  In the syrup (X), the content of the acrylic monomer (A) is 60 to 80% by mass. When the content is 60% by mass or more, the viscosity of the syrup is likely to be sufficiently low, and the coating workability of the syrup composition is improved. When the content is 80% by mass or less, good curability is easily obtained. A more preferable range of the content of the acrylic monomer (A) is 65 to 80% by mass, and 68 to 78% by mass is more preferable.

<Polymer (B)>
The polymer (B) is a polymer having a butyl methacrylate unit or an isobornyl (meth) acrylate unit and having a double bond. The polymer (B) is a component that imparts curability and imparts strength to the cured product. The double bond in the polymer (B) is a double bond involved in a radical polymerization reaction, and examples of the functional group having such a double bond include a vinyl group, an allyl group, and a (meth) acryloyl group. .
Both the butyl methacrylate unit and the isobornyl (meth) acrylate unit contribute to lowering the viscosity of the syrup composition containing the polymer (B) and improving the strength of the cured product at high temperature.

  As a monomer constituting the polymer (B), one or both of butyl methacrylate and isobornyl (meth) acrylate is essential. In addition, the above-mentioned monofunctional acrylic monomer and polyfunctional acrylic monomer , (Meth) acrylic acid and the like. Among them, it is preferable to use one or both of butyl methacrylate and isobornyl (meth) acrylate, methyl methacrylate, glycidyl (meth) acrylate, and (meth) acrylic acid. Examples of butyl methacrylate include n-butyl methacrylate, t-butyl methacrylate, and sec-butyl methacrylate.

The production method of the polymer (B) is not particularly limited. First, as a first-stage reaction, one or both of butyl methacrylate and isobornyl (meth) acrylate and a single functional group having a first functional group involved in the esterification reaction are used. A first copolymer having the first functional group is obtained by copolymerization with a monomer, and then a second functional group that undergoes an esterification reaction with the first functional group as a second stage reaction. And the method of obtaining the polymer (B) which has a double bond by esterifying the 2nd monomer which has a double bond, and the said 1st copolymer is preferable.
As a combination of the first functional group and the second functional group, a carboxy group and a glycidyl group,
A hydroxyl group and an isocyanate group are preferred.

The specific polymerization method is not particularly limited. First, in the first stage reaction, one or both of butyl methacrylate and isobornyl (meth) acrylate, methyl methacrylate, and (meth) acrylic acid are suspension-polymerized to have a carboxy group. A first copolymer is obtained, and in the second stage reaction, the obtained first copolymer is dissolved in methyl methacrylate, and glycidyl (meth) acrylate is added to the first copolymer in the solution. A method of obtaining the polymer (B) by adding by an esterification reaction is preferred.
The polymerization temperature for suspension polymerization in the first stage reaction is preferably in the range of 70 to 98 ° C., and the polymerization time is preferably about 2 to 5 hours. The reaction temperature in the second stage reaction is preferably 90 to 95 ° C., and the reaction time is preferably about 1 to 4 hours.

The preferred composition ratio of the monomers used in the first stage reaction is that the total of butyl methacrylate and isobornyl (meth) acrylate is 5 to 40% by mass, methyl methacrylate is 53 to 94.5% by mass, and (meth) acrylic acid is It is preferably 0.5 to 7% by mass, more preferably 15 to 40% by mass of butyl methacrylate or isobornyl (meth) acrylate, 59 to 81% by mass of methyl methacrylate, and 1 to 4% by mass of (meth) acrylic acid. preferable.

In the second stage reaction, 100 parts by mass of the first stage copolymer is dissolved in 70 to 150 parts by mass of methyl methacrylate, and 1 mol of (meth) acrylic acid used in the first stage reaction. The glycidyl (meth) acrylate is preferably reacted at 0.9 to 1.2 mol, more preferably at 1 to 1.1 mol.

  The suspension in which suspension polymerization is performed in the first stage reaction is preferably an aqueous suspension. It is preferable to add a dispersant to the aqueous suspension. The dispersant is not particularly limited, and examples thereof include poorly water-soluble inorganic compounds such as calcium phosphate, aluminum hydroxide, and starch silica; nonionic polymer compounds such as polyvinyl alcohol, polyethylene oxide, and cellulose derivatives; alkali poly (meth) acrylates Examples thereof include metal salts and anionic polymer compounds such as alkali metal salts of copolymers of (meth) acrylic acid and methyl (meth) acrylate. The amount of the dispersant used is preferably in the range of 0.005 to 5 mass%, more preferably in the range of 0.01 to 1 mass% with respect to the suspension.

  Moreover, it is preferable to contain electrolytes, such as sodium carbonate, sodium sulfate, manganese sulfate, in the suspension at the time of the suspension polymerization. By containing an electrolyte, dispersion stability can be improved. The amount of electrolyte used is not particularly limited as long as it is set appropriately.

  In the suspension polymerization, a polymerization initiator is used. The polymerization initiator is not particularly limited. For example, benzoyl peroxide, lauroyl peroxide, methyl ethyl ketone peroxide, tert-butyl peroxybenzoate, cumene hydroperoxide, cyclohexanone peroxide, dicumyl peroxide, bis (4-tert -Organic oxides such as -butylcyclohexyl) peroxydicarbonate; 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 addition amount and addition method of the polymerization initiator may be set as appropriate and are not particularly limited.

It is preferable to use a chain transfer agent in the suspension polymerization. When a chain transfer agent is used, the polymerization reaction of the monofunctional acrylic monomer can be easily controlled.
A thiol compound is preferably used as the chain transfer agent. The thiol compound is not particularly limited, and examples thereof include alkyl mercaptans such as tert-butyl mercaptan, n-octyl mercaptan, n-dodecyl mercaptan; aromatic mercaptans such as thiophenol thionaphthol: thioglycolic acid, thioglycolic acid thiol and the like And alkyl glycolate. The addition amount and addition method of the chain transfer agent may be appropriately set and are not particularly limited.

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

  A polymerization inhibitor may be added in the second stage reaction. When a polymerization inhibitor is added, the second stage reaction can be performed more stably. Examples of the polymerization inhibitor 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 addition amount of the polymerization inhibitor may be set as appropriate and is not particularly limited.

The weight average molecular weight of the first copolymer obtained by the first stage reaction is preferably in the range of 10,000 to 100,000, more preferably in the range of 15,000 to 80,000. preferable. When the weight average molecular weight is 10,000 or more, the strength of the cured product tends to be sufficiently high. When the weight average molecular weight is 100,000 or less, the viscosity of the syrup composition tends to be sufficiently low.
The weight average molecular weight in the present specification is obtained by dissolving the resin in a solvent (tetrahydrofuran) and converting the molecular weight measured by gel permeation chromatography (hereinafter referred to as “GPC”) into polystyrene.

The acid value (unit: KOH mg / g) of the polymer (B) obtained by the second stage reaction is preferably 1 or less, and more preferably 0.5 or less.
The acid value in this specification is a value obtained by dissolving a polymer in toluene and titrating with 0.1N KOH ethanol solution using phenolphthalein as an indicator.

  Content of the polymer (B) in syrup (X) is 20-40 mass%, and the range of 20-35 mass% is more preferable. When the content is 20% by mass or more, good curability is easily obtained, and when it is 40% by mass or less, syrup (X) tends to have a sufficiently low viscosity.

<Wax (C)>
The syrup composition of the present invention contains wax (C) in addition to syrup (X). Wax (C) exhibits an effect such as an improvement in surface curability utilizing an air blocking effect.
Examples of the wax (C) include solid waxes. Examples of solid waxes include higher fatty acids such as paraffins, polyethylenes, and stearic acid. Of these, paraffin wax is preferred.
It is preferable to use two or more paraffin waxes having different melting points. The melting point of the paraffin wax is preferably 40 to 80 ° C. When the melting point is 40 ° C. or higher, a sufficient air barrier action is obtained when the syrup composition is cured by coating, and the surface curability tends to be good. When the melting point is 80 ° C. or lower, the solubility in the syrup composition tends to be good when the syrup composition is produced. In addition, when two or more paraffin waxes having different melting points are used in combination, when the syrup composition is cured by coating, even if the base temperature changes, a sufficient air blocking action is obtained, and the surface curability is good. Become. When using 2 or more types together, it is preferable to use the thing of the difference of melting | fusing point about 5 to 20 degreeC together.

As the wax (C), a wax dispersed in an organic solvent may be used in terms of further improving the surface curability. When the wax is dispersed in the organic solvent and is finely divided, the air blocking action is more effectively exhibited. Such a wax dispersion is commercially available, and the wax dispersion can be added as it is when the syrup composition of the present invention is prepared. In this case, the syrup composition of the present invention will also contain an organic solvent.
Alternatively, the wax (C) may be used in which the wax (C) is dispersed in advance in the acrylic monomer (A) without containing any organic solvent.

  The addition amount of the wax (C) is 0.1 to 5 parts by mass with respect to 100 parts by mass of the cured syrup (X) from the viewpoint of balance between surface curability and physical properties of the coating film. 1-2 parts by mass are preferred. When the added amount of the wax (C) is 0.1 parts by mass or more, an air barrier action when the syrup composition is coated and cured is easily obtained, and good surface curability is obtained. When the addition amount of the wax (C) is 5 parts by mass or less, good storage stability of the syrup composition and good dispersibility of the wax are easily obtained.

<Tertiary amine (E)>
It is preferable to add a tertiary amine (E) to the syrup composition of the present invention. The tertiary amine (E) is a curing accelerator that accelerates the curing reaction.
As tertiary amine (E), aniline, N, N-dimethylaniline, N, N-diethylaniline, p-toluidine, N, N-dimethyl-p-toluidine, N, N-bis (2-hydroxyethyl) -P-toluidine, 4- (N, N-dimethylamino) benzaldehyde, 4- [N, N-bis (2-hydroxyethyl) amino] benzaldehyde, 4- (N-methyl-N-hydroxyethylamino) benzaldehyde, N, N-bis (2-hydroxypropyl) -p-toluidine, N-ethyl-m-toluidine, triethanolamine, m-toluidine, diethylenetriamine, pyridine, phenylmorpholine, piperidine, N, N-bis (hydroxyethyl) ) N, N-substituted anilines such as aniline and diethanolaniline, N, N-substituted-p-to Discoidin, 4- (N, N- disubstituted amino) benzaldehyde, and the like.

As the tertiary amine (E), an aromatic tertiary amine is more preferable. As the aromatic tertiary amine, those in which at least one aromatic residue is directly bonded to the nitrogen atom are preferable. Examples of the aromatic tertiary amine include N, N-dimethyl-p-toluidine, N, N-diethylaniline, N, N-diethyl-p-toluidine, N- (2-hydroxyethyl) N-methyl-p-. Toluidine, N, N-di (2-hydroxyethyl) -p-toluidine, N, N-di (2-hydroxypropyl) -p-toluidine; 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. Moreover, these are not limited to p (para) body, o (ortho) body and m (meta) body may be sufficient.
As the aromatic tertiary amine, N, N-dimethyl-p-toluidine, N, N-diethyl-p-toluidine, N, N-di (2-hydroxy) are used from the viewpoint of the reactivity and curability of the syrup composition. Ethyl) -p-toluidine and N, N-di (2-hydroxypropyl) -p-toluidine are preferred.
A tertiary amine (E) may be used individually by 1 type, and may be used in combination of 2 or more type.

The tertiary amine (E) may be added immediately before the syrup composition is cured, or may be added to the syrup composition in advance.
The addition amount of the tertiary amine (E) is preferably 0.05 to 10 parts by mass with respect to 100 parts by mass of the syrup (X) from the viewpoint of balance between curability and pot life (workability), 0.2-8 mass parts is more preferable, and 0.3-5 mass parts is especially preferable. When the added amount of the tertiary amine (E) is 0.05 parts by mass or more, good surface curability is easily obtained. When the added amount of the tertiary amine (E) is 10 parts by mass or less, an appropriate pot life can be easily obtained.

<Other curing accelerators>
You may make the syrup composition of this invention contain polyvalent metal soaps, such as cobalt naphthenate, cobalt octylate, cobalt acetoacetyl, as other hardening accelerators other than tertiary amine (E).
0.2-2 mass parts is preferable with respect to 100 mass parts of syrup (X), and, as for the addition amount of this other hardening accelerator, 0.3-1 mass part is more preferable.

<Curing agent>
In order to cure the syrup composition of the present invention, it is preferable to use a redox catalyst in which a curing accelerator and a curing agent are combined.
Examples of the curing agent include known polymerization initiators that can initiate radical polymerization. Examples of the polymerization initiator include diacyl peroxide, alkyl peroxide, ketone peroxide, and azo compound.
The polymerization initiator as the curing agent is preferably diacyl peroxide, particularly preferably benzoyl peroxide (benzoyl peroxide). The 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% by mass from the viewpoint of handleability.
A hardening | curing agent may be used individually by 1 type, and may be used in combination of 2 or more type.

The addition amount of the curing agent is preferably adjusted as appropriate so that the pot life of the syrup composition is 5 to 60 minutes. If a hardening | curing agent is added in this range, a polymerization reaction will be started immediately after addition and hardening of a syrup composition will advance.
0.25-10 mass parts is preferable with respect to 100 mass parts of syrup (X), and, as for the addition amount of benzoyl peroxide, 0.5-8 mass parts is more preferable. When the added amount of benzoyl peroxide is 0.25 part by mass or more, curability tends to be good. When the amount of benzoyl peroxide added is 10 parts by mass or less, the coating workability of the syrup composition and various physical properties of the resulting coating film are improved satisfactorily.

<Plasticizer>
You may add the plasticizer for aiming at the softening of a coating film and reduction of the shrinkage | contraction at the time of hardening to the syrup composition of this invention.
Examples of the plasticizer include phthalic acid esters such as dibutyl phthalate, di-2-ethylhexyl phthalate, and diisodecyl phthalate; adipic acid esters such as di-2-ethylhexyl adipate and octyl adipate; dibutyl sebacate, di-2-ethylhexyl seba Examples include sebacic acid esters such as Kate; dibasic fatty acid esters such as azelain esters such as di-2-ethylhexyl azelate and octyl azelate; tributyl acetyl citrate; paraffins such as chlorinated paraffin.
A plasticizer may be used individually by 1 type and may be used in combination of 2 or more type.
The addition amount of the plasticizer is preferably 20 parts by mass or less with respect to 100 parts by mass of syrup (X). When the added amount of the plasticizer is 20 parts by mass or less, the curability of the syrup composition is likely to be good, and the plasticizer does not exude on the surface of the coating film.

<Silane coupling agent>
A silane coupling agent may be added to the syrup composition of the present invention for the purpose of stabilizing adhesion to a substrate and imparting durability of adhesive strength.
Examples of silane coupling agents include vinyltrichlorosilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, and γ-glucidoxypropyl. Examples include trimethoxysilane and γ-mercaptopropyltrimethoxysilane.
The addition amount of the silane coupling agent is preferably 10 parts by mass or less with respect to 100 parts by mass of syrup (X), and more preferably 5 parts by mass or less from the viewpoint of curability and cost. By making the addition amount of the silane coupling agent 10 parts by mass or less, the surface curability is improved while maintaining the stability of the adhesion of the syrup composition to the base material.

<Polymerization inhibitor>
A polymerization inhibitor may be added to the syrup composition of the present invention for the purpose of improving storage stability and adjusting the polymerization reaction.
Examples of the polymerization inhibitor include hydroquinone, hydroquinone monomethyl ether, 2-6-di-t-butyl 4-methylphenol, and the like.
The addition amount of the polymerization inhibitor is preferably 0.01 to 0.1 parts by mass, and more preferably 0.02 to 0.08 parts by mass with respect to 100 parts by mass of syrup (X).

<Oligomer>
In order to improve surface curability, an oligomer having a (meth) acryloyl group may be added to the syrup composition of the present invention.
Examples of the oligomer include urethane (meth) acrylate, epoxy (meth) acrylate, and polyester (meth) acrylate.
Urethane (meth) acrylate reacts with hydroxyl group-containing (meth) acrylate, polyisocyanate having two or more isocyanate groups in one molecule, and polyol having two or more hydroxyl groups in one molecule by a known method. Can be obtained.
The epoxy (meth) acrylate is obtained by reacting a polybasic acid anhydride, a partially esterified product of a hydroxyl group-containing (meth) acrylate, a bifunctional bisphenol A type epoxy resin, and an unsaturated monobasic acid by a known method. It is The bifunctional bisphenol A type epoxy resin is a general-purpose epoxy resin obtained by reacting bisphenol A and epichlorohydrin.
Polyester (meth) acrylates are polybasic acids such as phthalic acid, isophthalic acid, tetrahydrophthalic acid, succinic acid, maleic acid, fumaric acid and adipic acid or their anhydrides, and polyhydric alcohol compounds such as ethylene glycol and propylene glycol. And a (meth) acrylic acid adduct or glycidyl (meth) acrylate and a polybasic acid anhydride.

<Other polymer components>
The syrup composition of the present invention may contain styrene / butadiene copolymer, vinyl chloride / vinyl acetate copolymer, cellulose acetate butyrate resin, epoxy resin, and the like as other polymer components.

<Other additives>
An ultraviolet absorber, a light-resistant stabilizer, and an antifoaming agent can be added to the syrup composition of this invention in arbitrary ratios as needed. Moreover, you may add thixotropic agents, such as antioxidant, a leveling agent, and an aerosil.
Furthermore, inorganic pigments such as chromium oxide, bengara and iron oxide, organic pigments such as phthalocyanine blue may be added, and resistant pigments such as calcium carbonate may be added.

  As an ultraviolet absorber, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-octyloxybenzophenone, 2-hydroxy-4-decyloxybenzophenone, 2-hydroxy-4,4′-dimethoxybenzophenone, 2-hydroxy-4 Derivatives of 2-hydroxybenzophenone, such as 2,4'-dibutoxybenzophenone or 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-ditertiarybutyl Phenyl) benzotriazole or a halide thereof, phenyl salicylate, p-tertiarybutylphenyl salicylate, and the like. These may be used alone or in combination of two or more.

  Examples of the light-resistant stabilizer 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-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl] -4- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] -2,2,6,6, -tetramethylpiperidine, 4-benzoyloxy-2,2,6,6, -tetramethylpiperidine and the like. These may be used alone or in combination of two or more.

  Examples of the antifoaming agent include known antifoaming agents. Specific examples include an acrylic antifoaming agent in which a special acrylic polymer is dissolved in a solvent, a vinyl antifoaming agent in which a special vinyl polymer is dissolved in a solvent, and the like, which are commercially available from Enomoto Kasei Co., Ltd. Dispalon series (Product names: OX-880EF, OX-881, OX-883, OX-77EF, OX-710, OX-8040, 1922, 1927, 1950, P-410EF, P-420, P-425, PD-7, 1970, 230, 230HF, LF-1980, LF-1982, LF-1983, LF-1984, LF-1985, etc.) are more preferred, and among the Disparon series, 230, 230HF, LF-1980 LF-1985 is more preferable, and 230 and LF-1985 are particularly preferable. Moreover, BYK-052 and BYK-1752 marketed by Big Chemie Japan are preferable.

<Drainable top coat / Heat shield top coat>
The syrup composition of the present invention is particularly suitably used for a composition for forming a drainable topcoat or a heat-insulating topcoat used for asphalt pavement or concrete pavement such as honey grain, fine grain, and open grain asphalt. . That is, the cured product of the syrup composition of the present invention is suitable as a drainable top coat or a heat-shielding top coat.
Up to now, drainage pavement using open-graded asphalt has been constructed with increasing needs for prevention of rainwater accumulation on the road and low noise effect. The paint used to solve the problem is a drainable topcoat composition. Drainable top coats are not only used to prevent aggregate disengagement and clogging of voids, but are also often used for coloring bus lanes, highway service areas or parking areas, and ETC lanes.

  A thermal barrier top coat is a paint film applied to concrete structures such as asphalt, concrete, concrete walls, and piers that cover the ground, and has high heat insulation properties. It absorbs less and suppresses heat conduction in concrete structures such as asphalt, concrete, rooftops, concrete walls, and piers that cover the ground. In particular, it is suitable for top coats coated on asphalt pavement such as honey granules, fine grains, and open grain asphalt, and concrete pavement, and is expected as a countermeasure for severe heat island phenomenon in urban areas.

<Aggregate>
When the syrup composition of the present invention is used as a composition for forming a drainable top coat or a heat-shielding top coat, it is preferable to contain an aggregate.
In the drainage top coat or the heat-shielding top coat, it is usually preferable to coat two layers, an undercoat layer and an overcoat layer, and to contain an aggregate for preventing slippage in the undercoat layer and / or the overcoat layer.
Examples of the aggregate used include natural mineral ores such as dredged sand, river sand, cold water stone, emery, marble, alumina, slag, glass, ceramic aggregate, pottery, porcelain, tile, glass beads, colored aggregate, and the like. These are used alone or in combination of two or more. In particular, when the undercoat layer and the overcoat layer are colored, it is preferable to use ceramic aggregates of the same color. Further, an artificial stone obtained by curing unsaturated polyester resin, acrylic resin, epoxy resin, phenol resin or the like may be used. A preferred aggregate particle size is 0.01 to 3 mm, more preferably 0.1 to 2 mm.
Aggregate may be preliminarily contained in the syrup composition when a coating machine is not used, but immediately after the syrup composition is applied to form a coating film, the aggregate is sprayed on the coating film. The method of making it contain by this is preferable. The amount of aggregate sprayed is preferably 0.1 to 1 kg / m ² , more preferably 0.2 to 0.8 kg / m ² .

<Light reflective particles>
When using the syrup composition of this invention as a composition for forming a heat-shielding topcoat, it is preferable to contain light-reflective particles.
As the light-reflecting particles, pigments that absorb in the visible region and reflect in the near-infrared region are used. Since the pigment exhibits absorption in the visible region, it exhibits a deep color such as black, gray, or dark brown. However, since there is no light absorption in the near-infrared region and a high reflectance, there is no absorption of heat energy and an increase in the temperature of the coating film can be prevented.
The pigment as the light-reflective particles can be used without particular limitation as long as it is a pigment that absorbs in the visible region and reflects in the near-infrared region. Among them, a pigment having a solar reflectance of 15% or more in the region of 350 to 2100 nm defined by JIS A 5759 (sunlight shielding / glass scattering prevention film) is preferably used. Here, the solar reflectance data is measured in a sufficiently concealed state, specifically, in a coating film having a concealment rate of about 1.0. Examples of pigments used include white pigments such as zinc white, green pigments such as phthalocyanine green, blue pigments such as phthalocyanine blue, yellow pigments such as monoazo yellow, red pigments such as iron oxide and quinacridone. And pigments.

Hollow particles can also be used as the light reflecting particles. Hollow particles are excellent in heat insulation. Among these, hollow inorganic particles are preferable from the viewpoint of strength and heat insulation properties. In particular, transparent or translucent hollow particles can reflect sunlight and the like in the surface layer and shell, and have a high long wave emissivity. Ceramic particles are preferred. Here, the long wave emissivity is the conversion efficiency when the absorbed heat is emitted again as infrared rays. Therefore, when the hollow ceramic particles are contained in the coating film, the temperature increase of the coating film can be effectively suppressed even when the coating film absorbs heat. As described above, the transparent or translucent hollow ceramic particle imparts a high heat shielding effect to the coating film by having reflectivity, heat insulation and radiation. The hollow ceramic strength of the hollow ceramic particles is preferably 3.9 N / mm ² or more, and the average particle size is preferably about 5 to 150 μm.
Examples of the hollow ceramic particles include hollow particles made of a zirconia / titania composite, hollow particles made of a silicon boride ceramic, a shirasu balloon, and a glass balloon.

When using a pigment as light-reflective particles, it is preferable to blend 5 to 70 parts by mass of the pigment with respect to 100 parts by mass of syrup (X).
When hollow particles are used as the light reflecting particles, it is preferable to blend 5 to 70 parts by mass of the hollow particles with respect to 100 parts by mass of the syrup (X).
More preferably, 5 to 55 parts by mass of pigment and 5 to 15 parts by mass of hollow ceramic fine particles are used in combination with 100 parts by mass of syrup (X).

  Since hollow particles have a specific gravity of less than 1, they tend to float on the surface of the syrup composition when used alone. Therefore, the monomer on the surface layer of the syrup composition volatilizes and causes a so-called skinning phenomenon, which may deteriorate the storage stability. Therefore, it is preferable to add a thixotropic agent when hollow particles are contained in the syrup composition.

As the thixotropic agent, an organic thixotropic agent such as fatty acid amide, organic bentonite, and oxidized polyethylene wax is preferable. If necessary, fine silica is used in combination. Examples of the thixotropic agent combination include a fatty acid amide / fine silica combination, an organic bentonite / fine silica combination, a fatty acid amide / organic bentonite / fine silica combination, and an oxidized polyethylene wax / fine silica combination. The average primary particle diameter of the fine silica is preferably 7 to 40 μm.
By including the thixotropic agent, structural viscosity is imparted to the syrup composition, and the hollow particles can be uniformly distributed, and the storage stability of the syrup composition is improved. Further, the hollow particles can be uniformly distributed in the coating film formed by applying the syrup composition.
The content of the thixotropic agent is 0.5 to 5 parts by mass in total of the syrup composition (with respect to 100 parts by mass), fatty acid amide and / or organic bentonite, and 1 to 10 parts by mass of fine silica. preferable. When the content of the thixotropic agent is too small, it becomes difficult to uniformly distribute the hollow particles in the paint. On the other hand, when the content of the thixotropic agent is too large, the fluidity of the syrup composition is deteriorated and is not practical.

<Coating method>
The syrup composition of the present invention can be used as a covering material for floor surfaces, wall surfaces, road pavement surfaces, and the like.
Examples of a method for coating a construction surface such as a floor surface, a wall surface, and a road pavement surface include a method of coating the construction surface with the syrup composition of the present invention to form a coating film. When the coating film is cured, a coating layer made of a cured product is formed on the construction surface. It is preferable to apply a syrup composition on the construction surface to form an undercoat layer and an overcoat layer (topcoat).
Examples of the coating method include known coating methods using a roller, a gold trowel, a brush, a flexible bow, a coating machine (spray coating machine, etc.) and the like. It is desirable to add a curing accelerator to the main agent side and add benzoyl peroxide, for example, to the curing agent side.

When the syrup composition of the present invention is used as a coating material, the viscosity of the syrup composition may be appropriately selected in consideration of coating workability, and is not particularly limited, but is preferably 100 to 1000 mPa · S, for example.
If the viscosity is low, the curability may be lowered and may not be cured sufficiently. If the viscosity is too high, the coating workability and the self-leveling property are lowered.
Further, the temperature during coating is preferably -30 to 60 ° C, particularly preferably -10 to 40 ° C, and from the viewpoint of workability, the pot life is preferably 5 to 60 minutes, and the curing time is preferably within 10 to 90 minutes. The pot life and the curing time can be adjusted by adjusting the amounts of the curing agent and the curing accelerator according to the temperature at the time of coating.

Hereinafter, the present invention will be specifically described with reference to examples. The present invention is not limited to these examples.
In the examples, all “parts” indicate “parts by mass”, and all “%” other than humidity indicates “% by mass”.

[Synthesis Example 1: Preparation of Composition S-1 Containing Polymer (B)]
First, the first stage reaction was performed. That is, 135 parts of deionized water and 0.4 part of polyvinyl alcohol (degree of saponification 80%, degree of polymerization 1,700) as a dispersing agent were added to a polymerization apparatus equipped with a stirrer, a condenser, and a thermometer and stirred. After the polyvinyl alcohol is completely dissolved, the stirring is once stopped, 4 parts of methacrylic acid (hereinafter abbreviated as MAA), 60 parts of methyl methacrylate (hereinafter abbreviated as MMA), n-butyl methacrylate (hereinafter referred to as n-BMA). 36 parts, 2,2'-azobis-2-methylbutyronitrile (hereinafter abbreviated as AMBN) 0.2 parts as a polymerization initiator, n-dodecyl mercaptan (hereinafter abbreviated as n-DM) as a chain transfer agent .) 0.8 part, 0.1 part of sodium carbonate as an electrolyte was added and stirred again, heated to 75 ° C. and reacted for 2.5 hours, heated to 98 ° C. and held for 1.5 hours. Reaction was terminated. After cooling to 40 ° C., the obtained aqueous suspension is filtered through a nylon filter cloth having a mesh opening of 45 μm, the filtrate is washed with deionized water, dehydrated, dried at 40 ° C. for 16 hours, and granular vinyl. A system polymer (first copolymer) was obtained. The weight average molecular weight of the obtained granular vinyl polymer was 41,500.

  The second stage reaction was then performed. That is, in a polymerization apparatus equipped with a stirrer, a condenser, and a thermometer, 6.6 parts of glycidyl methacrylate (hereinafter abbreviated as GMA), 1.5 parts of tetrabutylammonium bromide as an esterification catalyst, and 2, 0.1 parts of 6-di-t-butyl-4-methylphenol (hereinafter abbreviated as BHT) and 108.2 parts of methyl methacrylate were added, and the granular vinyl polymer obtained above (the first 1 Copolymer) 100 parts were gradually added, and after the entire amount was added, the temperature was raised to 90 ° C. and held for 2 hours to obtain a composition S-1 containing a polymer (B) having an acid value of 0.3 and MMA. . The molar ratio of GMA used in the second stage reaction (hereinafter referred to as the molar ratio of MAA / GMA) was 1/1 with respect to 1 mole of MAA used in the first stage reaction.

[Synthesis Example 2: Preparation of Composition S-2 Containing Polymer (B)]
In the first stage reaction of Synthesis Example 1, the amount of MAA used was changed from 4 parts to 2 parts, the amount of MMA used was changed from 60 parts to 78 parts, and the amount of n-BMA used was changed from 36 parts to 20 parts. . Other than that was carried out similarly to the synthesis example 1, and obtained the granular vinyl polymer (1st copolymer) of the weight average molecular weight 43,000.
A second stage reaction was carried out using the obtained granular vinyl polymer. In the second stage reaction of Synthesis Example 1, the amount of GMA used was changed from 6.6 parts to 3.3 parts, and the amount of MMA used was changed from 108.2 parts to 104.9 parts. Otherwise, the reaction was conducted in the same manner as in Synthesis Example 1 to obtain a composition S-2 containing a polymer (B) having an acid value of 0.4 and MMA. The molar ratio of MAA / GMA was 1/1.

[Synthesis Example 3: Preparation of Composition S-3 Containing Polymer (B)]
In the first stage reaction of Synthesis Example 1, the amount of MMA used was changed from 60 parts to 66 parts, and 30 parts of isobornyl methacrylate (hereinafter abbreviated as IBXMA) was used instead of 36 parts of n-BMA. The amount of AMBN used was changed from 0.2 parts to 0.3 parts, and the amount of n-DM used was changed from 0.8 parts to 1.9 parts. Other than that was carried out similarly to the synthesis example 1, and obtained the granular vinyl polymer (1st copolymer) of the weight average molecular weight 21,000.
Using the obtained granular vinyl polymer, the second stage reaction was conducted in the same manner as in Synthesis Example 1 to obtain a composition S-3 containing a polymer (B) having an acid value of 0.35 and MMA. . The molar ratio of MAA / GMA is the same as in Synthesis Example 1.

[Synthesis Example 4: Preparation of Composition S-4 Containing Polymer (B)]
In the first stage reaction of Synthesis Example 1, the amount of MAA used was changed from 4 parts to 2 parts, the amount of MMA used was changed from 60 parts to 68 parts, and instead of 36 parts of n-BMA, 30 parts of IBXMA was used. In place of 0.2 part of AMBN, 0.4 part of lauroyl peroxide (hereinafter abbreviated as LPO) was used. Other than that was carried out similarly to the synthesis example 1, and obtained the granular vinyl polymer (1st copolymer) of the weight average molecular weight 40,000.
A second stage reaction was carried out using the obtained granular vinyl polymer. Same as Synthesis Example 1, except that the amount of GMA used was changed from 6.6 parts to 3.3 parts and the amount of MMA used was changed from 108.2 parts to 104.9 parts in the second stage reaction of Synthesis Example 1. To obtain a composition S-4 containing a polymer (B) having an acid value of 0.3 and MMA. The molar ratio of MAA / GMA was 1/1.

[Example 1: Production of syrup composition]
Using composition S-1 obtained in Synthesis Example 1, a syrup composition was prepared with the formulation shown in Table 1.
In addition, the compounding quantity (unit: mass part) of composition S-1-S-4 described in Table 1 is the total amount of the polymer (B) and MMA contained in this composition, and it writes together. The value in () is the amount (unit: part by mass) of the polymer (B) contained in the blended compositions S-1 to S-4. The amount of MMA contained in the blended compositions S-1 to S-4 (unit: part by mass) is the column of “MMA derived from (B)” in the acrylic monomer (A). It was described in.

  In a 1 L flask equipped with a stirrer, a thermometer, and a condenser tube, 60 parts of composition S-1 containing the polymer (B) obtained in Synthesis Example 1, 2-hydroxypropyl methacrylate (hereinafter abbreviated as 2-HPMA) 35 Parts, polytetramethylene glycol dimethacrylate (manufactured by NOF Corporation, product name: Blemmer PDT-650, hereinafter abbreviated as PTMG), 0.05 parts of BHT, 130 (product name, manufactured by Nippon Seiki Co., Ltd., paraffin) Wax, melting point 55 ° C.) 0.8 part, 150 (product name, manufactured by Nippon Seiki Co., Ltd., paraffin wax, melting point 66 ° C.) 0.6 part, HNP-9 (product name, manufactured by Nippon Seiki Co., Ltd., paraffin wax, 0.4 part of melting point 75 ° C.), 0.4 part of N, N-di (2-hydroxyethyl) -p-toluidine (hereinafter abbreviated as PTEO), and BYK-1752 (BIC Chemie Yapan Ltd.) after turning the 0.5 parts, 70 ° C. 2 h heating to dissolve, to obtain a syrup composition is cooled.

[Examples 2 to 4: Production of syrup composition]
A syrup composition was obtained in the same manner as in Example 1 except that the formulation was changed as shown in Table 1.
In Table 1, 2-EHA is 2-ethylhexyl acrylate, and the plasticizer ATBC is tributyl acetylcitrate.

[Comparative Examples 1-4]
A syrup composition was obtained in the same manner as in Example 1 except that the formulation was changed as shown in Table 1. In Comparative Examples 1 and 2, the polymer (B) was not used, and instead, copolymers 1 and 2 having an n-butyl methacrylate unit but not having a polymerizable double bond were used. In Comparative Examples 3 and 4, an acrylic monomer having an alicyclic structure was used.
Copolymer 1 is a copolymer having a weight average molecular weight of 24,000 obtained by copolymerizing 60 parts of MMA and 40 parts of n-BMA.
Copolymer 2 is a copolymer having a weight average molecular weight of 41,000 obtained by copolymerizing 60 parts of MMA and 40 parts of n-BMA.
FA-512MT is dicyclopentenyloxyethyl acrylate (manufactured by Hitachi Chemical Co., Ltd.).

[Production Example 1: Syrup composition for drainable top coat]
To 102.75 parts of each syrup composition obtained in Examples 1 to 4 and Comparative Examples 1 to 4, 10 parts of MRT-60 (product name, manufactured by Ryokan) as a Bengala colorant were mixed and stirred. Furthermore, 3 parts of benzoyl peroxide (manufactured by Gunpaku Akzo, hereinafter abbreviated as BPO50) are added and mixed as a curing agent, and each of the syrup compositions obtained in Examples 1-4 and Comparative Examples 1-4 is included. A drainable topcoat syrup composition was prepared.

[Evaluation]
(Viscosity, specific gravity)
The viscosity and specific gravity of each drainage topcoat syrup composition obtained in Production Example 1 were measured. The results are shown in Table 2.
The viscosity was measured at 20 ° C. using a B-type viscometer (BM type, manufactured by Tokimec).
Specific gravity measured the specific gravity in 20 degreeC using the specific gravity cup.

(Stationary test)
First, a stationary test specimen was prepared using each drainable topcoat syrup composition obtained in Production Example 1.
That is, using an air spray (product name: spray gunweider 88, manufactured by Anest Iwata Co., Ltd.) on an open grain asphalt plate (size: 300 × 300 × 50 mm, manufactured by Oari Construction Co., Ltd.), an air pressure of 0.3-0. Undercoat a syrup composition for drainage top coat so that the coating amount is 500 g / m ² at 4 MPa, and immediately apply an anti-slip aggregate (product name: Cerasand A1 grain) It sprayed so that a spraying quantity might be 250 g / m < ² >. On top of that, the same drainable topcoat syrup composition was overcoated in the same manner, and immediately thereafter, an anti-slip aggregate was sprayed in the same manner. This was cured at room temperature (20 ° C.) to obtain a specimen for a stationary test.

In the stationary test, a mixture stationary tester manufactured by Intesco was used, and the durability of the tire against the stationary test was evaluated under the following test conditions. The results are shown in Table 2.
Installed car tire: 14-inch radial tire for passenger cars.
Test specimen drive system, specimen repeat angle: ± 30 ° Repeat speed: 6 rpm.
Load load: 3KN.
The measurement was performed on a test body at 20 ° C. and a test body held at 60 ° C. for 4 hours. The determination was made by visually counting the number of peeled portions of the coating layer after the stationary test, and evaluating and determining based on the following criteria.
◯: 5 or less peeling points, Δ: 6 or more peeling points to 10 or less, ×: 11 peeling points or more.

(Coating workability)
In the preparation of the test specimen for stationary test, the appearance of the coating film immediately after coating was visually observed and evaluated based on the following criteria. The results are shown in Table 2.
○: Good, Δ: Concavity and convexity, X: Stringing and concavity and convexity.

(Curing time)
2 parts by mass of BPO50 as a curing agent was added to 102.75 parts of the syrup compositions obtained in Examples 1 to 4 and Comparative Examples 1 to 4, and mixed well to obtain a syrup composition containing BPO. The syrup composition containing BPO was introduced from the bottom of a test tube having a diameter of 10 mm and a length of 120 mm to 70 mm, and a thermocouple was placed in the center in the depth direction of the syrup composition. While the test tube was left in water at 20 ° C. to cure the syrup composition, the heat generation temperature was measured over time by the thermocouple. The time from the addition of BPO to the time when the maximum exothermic temperature was reached was determined, and this time was taken as the curing time. The results are shown in Table 2.

(Maximum point strength, elongation at break)
About the hardened | cured material obtained by the measurement of hardening time, the breaking point elongation and the maximum point intensity | strength were measured based on JISK6251. The measurement temperature was 20, 40, and 60 ° C. The results are shown in Table 2.
(hardness)
About the hardened | cured material obtained by the measurement of hardening time, hardness was measured according to JISK7215. The measurement conditions were type D and measurement temperature: 20 ° C. The results are shown in Table 2.

As shown in the results of Table 2, the cured product of the syrup composition containing BPO using the syrup compositions of Examples 1 to 4 has high hardness, good maximum point strength and good elongation at break, and high strength. .
The syrup composition for drainable topcoats using the syrup compositions of Examples 1 to 4 has low viscosity and excellent coating workability, and the cured product has good results of the stationary test even at a high temperature of 60 ° C. And excellent in durability.
On the other hand, the syrup composition of Comparative Example 1 containing no polymer (B) is inferior in maximum point strength and elongation at break and low in hardness. Further, the syrup composition of Comparative Example 2 which does not contain the polymer (B) and uses the copolymer 2 having a weight average molecular weight larger than that of Comparative Example 1 has a poor maximum point strength and a slightly low hardness.
Moreover, the syrup composition of Comparative Examples 3 and 4 using an acrylic monomer having an alicyclic structure had high viscosity, and the maximum point strength and elongation at break of the cured product were inferior.

[Production Example 2: Syrup composition for thermal barrier top coat]
To 102.75 parts of the syrup composition obtained in Example 1, 8.3 parts of a black pigment (product name: Chromofine Black A-1103, manufactured by Dainichi Seika Kogyo Co., Ltd.) as light-reflective particles was mixed and dispersed. Glass beads having a particle size of 2.1 mm were added as a medium, and the pigment was dispersed using a desktop batch mill so that the pigment became 10 microns or less. After removing the glass beads with gauze, 4.5 parts of fine silica and 0.97 parts of organic bentonite as a thixotropic agent and 7.3 parts of a glass balloon as light reflecting particles were added and mixed well. Further, 3 parts of BPO50 as a curing agent was added and mixed to obtain a syrup composition for a heat-shielding topcoat.

[Production Example 3: Syrup composition for thermal barrier top coat]
In Production Example 2, the blending components and blending amounts were changed as shown in Table 3 to obtain a syrup composition for a heat-shielding top coat.
In Table 3, the dark brown pigment is Dipiroxide Brown 9270 (product name) manufactured by Dainichi Seika Kogyo Co., Ltd., the yellow pigment is Hoster Palm Yellow H3G (product name) manufactured by Hoechst, the blue pigment is phthalocyanine blue, and the white pigment is Titanium oxide.

[Production Example 4: Syrup composition containing no light reflecting particles]
In order to examine the effect of adding light-reflecting particles, a syrup composition containing BPO containing no light-reflecting particles was prepared. That is, 3 parts of BPO50 as a curing agent was added to 102.75 parts of the syrup composition obtained in Example 1 and mixed to obtain a syrup composition containing BPO.

[Evaluation]
(Stationary test)
A test specimen for a stationary test was prepared using the syrup composition for a heat-shielding top coat obtained in Production Examples 2 and 3 and the syrup composition in Production Example 4, respectively.
That is, using an air spray (product name: spray gunweider 88, manufactured by Anest Iwata) on a dense-grained asphalt plate (size: 300 × 300 × 40 mm, manufactured by Oari Construction Co., Ltd.), an air pressure of 0.3-0. The coating was applied at 4 MPa at a coating amount of 1 kg / m ^2, and immediately, silica sand No. 5 was sprayed as a non-slip aggregate so that the spraying amount was 250 g / m ² . This was cured at room temperature (20 ° C.) to obtain a specimen for a stationary test.
Using the obtained specimen, the durability of the tire against the stationary was evaluated in the same manner as the stationary test described above. The results are shown in Table 3.

(Heat insulation)
The test specimen for the stationary test created above was left outdoors from 10:00 to 14:00 on a sunny day in summer in July 19 and the surface temperature of the specimen at 14:00 was measured with a contact thermometer. The outside temperature was 35 ° C. The results are shown in Table 3.

[Reference Example 1]
The dense asphalt plate used for the preparation of the test specimen for the stationary test was used as it was without coating, and the heat shielding property was evaluated in the same manner as described above. The results are shown in Table 3.

As shown in the results of Table 3, the test body coated with the cured product of the heat-shielding topcoat syrup composition of Production Examples 2 and 3 had a surface temperature of It is recognized that the rise is suppressed and that it has good heat shielding properties. Moreover, the result of the stationary test is good even at a high temperature of 60 ° C., and the durability is excellent.
On the other hand, the test body coated with the cured product of the syrup composition of Production Example 4 containing no light-reflective particles has a good result of the stationary test at 60 ° C., but the surface temperature is a reference example. As high as 1.

The syrup composition of the present invention has a low viscosity and is excellent in coating workability.
The cured product of the present invention has high strength and excellent durability at high temperatures. Therefore, it is useful for civil engineering and building applications such as coverings such as floor surfaces, wall surfaces, and road pavement surfaces, and is particularly suitable for drainage top coats and heat shield top coats.

Claims (6)

  60-80% by mass of acrylic monomer (A) having no alicyclic structure, and 20-40% by mass of polymer (B) having a butyl methacrylate unit or isobornyl (meth) acrylate unit and having a double bond The syrup composition which contains 0.1-5 mass parts of wax (C) with respect to 100 mass parts of syrup (X) containing.   A cured product of the syrup composition according to claim 1.   A drainable top coat comprising the cured product according to claim 2.   Furthermore, the syrup composition of Claim 1 containing 5-70 mass parts of light-reflective particles with respect to 100 mass parts of the said syrup (X).   A heat-shielding top coat comprising a cured product of the syrup composition according to claim 4.   The coating method which has the process of apply | coating the syrup composition of Claim 1 or 4 to a construction surface, and forming a coating film.