JP5824910B2 - Resin mortar composition and coating - Google Patents

Description

  The present invention relates to a resin mortar composition and a coating.

In many cases, a floor surface, road, wall surface or the like made of concrete or asphalt is coated with a coating film made of a syrup composition containing a monofunctional monomer such as methyl methacrylate, a tertiary amine, and wax.
Moreover, the composition (resin mortar composition) which mix | blended the aggregate with the syrup composition for the purpose of improving the durability of a coating film is proposed (for example, refer patent document 1).
Furthermore, an overcoat layer is provided on the coating film composed of the syrup composition or the resin mortar composition for the purpose of design or protection, or between these coating film and the floor surface, road, wall surface, etc. In general, an undercoat layer (primer layer) is provided to improve adhesion.

JP 2006-265521 A

A coating film composed of a resin mortar composition or the like is required to have excellent strength. Generally, in order to form a high-strength coating film, the content of a monofunctional monomer such as methyl methacrylate is increased. It is said to be good.
However, in the composition described in Patent Document 1, when the content of methyl methacrylate is increased, a high-strength coating film can be obtained, but the adhesion with the topcoat layer tends to decrease.

  This invention is made | formed in view of the said situation, and it aims at providing the resin mortar composition which can form the coating film which was high intensity | strength and excellent in adhesiveness with a topcoat layer, and a coating.

  As a result of intensive studies, the present inventors have found that a high strength and topcoat layer can be obtained by blending an aggregate with a syrup composition containing a specific type and amount of syrup and a specific amount of wax. The present inventors have found that a coating film having excellent adhesion can be formed, and have completed the present invention.

  That is, the resin mortar composition of the present invention comprises 10 to 30% by mass of a hydroxyalkyl (meth) acrylate monomer (A) having one or more hydroxyalkyl groups having 2 to 12 carbon atoms in the molecule. 40 to 75% by mass of one (meth) acryloyl group-containing monomer (B) (excluding the hydroxyalkyl (meth) acrylate monomer (A)), and two or more monomers in the molecule The monomer (C) having a (meth) acryloyl group (excluding the hydroxyalkyl (meth) acrylate monomer (A)) is 0.5 to 15% by mass, and the plasticizer (D) is 15% by mass. % Of the syrup (x) containing 10 to 30% by mass of the resin (E) having a glass transition temperature of 20 to 155 ° C. and 100 parts by mass of the syrup (x), the aromatic tertiary amine (F) 0.3-4 mass And syrup composition (X) containing 0.1 to 2.5 parts by mass of wax (G), aggregate (H) with respect to 100 parts by mass of syrup (x) in the syrup composition (X) ) 150 to 800 parts by mass are blended.

  Further, the coating of the present invention comprises 50 to 85% by mass of a monomer (B) having one (meth) acryloyl group in the molecule and a single monomer having two or more (meth) acryloyl groups in the molecule. The syrup (y) containing 20% by mass or less of the monomer (C) and 10 to 35% by mass of the resin (E ′) having a glass transition temperature of 20 to 155 ° C., and 100 parts by mass of the syrup (y) An undercoat layer made of a cured product of a syrup composition (Y) containing 0.3 to 4 parts by mass of an aromatic tertiary amine (F) and 0.1 to 2.5 parts by mass of a wax (G); An intermediate coating layer made of a cured product of the resin mortar composition and an overcoat layer made of a cured product of the syrup composition (Y) are sequentially laminated.

  ADVANTAGE OF THE INVENTION According to this invention, the resin mortar composition which can form the coating film which was high intensity | strength and excellent in adhesiveness with topcoat layer, and a coating can be provided.

Hereinafter, the present invention will be described in detail.
In the present specification, “(meth) acryl” is a general term for acrylic and methacrylic. “(Meth) acrylate” is a general term for acrylate and methacrylate. The “(meth) acryloyl group” is a general term for an acryloyl group and a methacryloyl group, and the general formula CH ₂ ═C (R) —C (═O) — [R represents a hydrogen atom or a methyl group. ].

[Resin mortar composition]
In the resin mortar composition of the present invention, the aggregate (H) is added to the syrup composition (X) containing the syrup (x), the aromatic tertiary amine (F), and the wax (G). Become.

<Syrup composition (X)>
(Syrup (x))
Syrup (x) is a hydroxyalkyl (meth) acrylate monomer (A) (hereinafter referred to as “monomer (A)”) having one or more hydroxyalkyl groups having 2 to 12 carbon atoms in the molecule. A monomer (B) having one (meth) acryloyl group in the molecule (excluding the monomer (A)) (hereinafter referred to as “monomer (B)”), and a molecule A monomer (C) having two or more (meth) acryloyl groups therein (excluding the monomer (A)) (hereinafter referred to as “monomer (C)”), and a plasticizer (D) and resin (E) whose glass transition temperature is 20-155 degreeC.

Monomer (A);
A monomer (A) is a component which provides adhesiveness and intensity | strength to a coating film.
Examples of the monomer (A) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, hydroxypentyl (meth) acrylate, and hydroxyhexyl (meth) acrylate. , Hydroxyheptyl (meth) acrylate, hydroxyoctyl (meth) acrylate, hydroxynonyl (meth) acrylate, hydroxydecyl (meth) acrylate, hydroxyundecyl (meth) acrylate, hydroxydodecyl (meth) acrylate, and the like. Among these, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate are particularly preferable.
These monomers (A) may be used individually by 1 type, and may use 2 or more types together.

  Content of a monomer (A) is 10-30 mass% in syrup (x) 100 mass%, and 10-20 mass% is preferable. If content of a monomer (A) is 10 mass% or more, it is excellent in adhesiveness with the upper-coat layer mentioned later, and can form a high intensity | strength coating film. On the other hand, when the content of the monomer (A) is 30% by mass or less, the pot life suitable for the work (time when the composition has fluidity and can be painted) can be obtained, and the coating film The water resistance of is improved.

Monomer (B);
A monomer (B) is a component which provides intensity | strength to the coating film formed from the resin mortar composition of this invention.
Examples of the monomer (B) include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, and i-butyl (meth) acrylate. , T-butyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate Decyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, and the like.
Moreover, as a monomer (B), the monomer which has a heterocyclic ring, and oligoethylene glycol monoalkyl ether (meth) acrylate can be used.

Specific examples of the monomer having a heterocycle include (meth) acrylates having a heterocycle selected from the group consisting of a furan ring, a hydrofuran ring, a pyran ring, and a hydropyran ring.
Examples of the (meth) acrylate having a furan ring include furyl (meth) acrylate and furfuryl (meth) acrylate.
Examples of the (meth) acrylate having a hydrofuran ring include tetrahydrofuryl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl (meth) acrylate, and the like.
Examples of the (meth) acrylate having a pyran ring include pyranyl (meth) acrylate.
Examples of the (meth) acrylate having a hydropyran ring include dihydropyranyl (meth) acrylate, tetrahydropyranyl (meth) acrylate, dimethyldihydropyranyl (meth) acrylate, and dimethyltetrahydropyranyl (meth) acrylate.

  Examples of oligoethylene glycol monoalkyl ether (meth) acrylate include ethylene glycol monomethyl ether methacrylate, ethylene glycol monoethyl ether methacrylate, diethylene glycol monomethyl ether (meth) acrylate, diethylene glycol monoethyl ether (meth) acrylate, and 2-ethoxylated 2 -Ethylhexyl (meth) acrylate, polyethylene glycol monomethyl ether (meth) acrylate, polyethylene glycol monoethyl ether (meth) acrylate and the like.

Moreover, as the monomer (B), other monomers than the above-described monomers can be used.
Examples of other monomers include hydroxyl group-terminated polyalkylenes such as polyethylene glycol mono (meth) acrylate (ethylene glycol repeat number of 4 or less) and polypropylene glycol mono (meth) acrylate (polypropylene glycol repeat number of 2 or less). Glycol mono (meth) acrylate; fluorine atom-containing (meth) acrylate such as trifluoroethyl (meth) acrylate, tetrafluoroethyl (meth) acrylate, hexafluoroethyl (meth) acrylate, octafluoroethyl acrylate; dimethylcyclohexyl (meth) Di- or trialkylcyclohexyl group-containing (meth) acrylates such as acrylate and trimethylcyclohexyl (meth) acrylate; dimethylphenyl (meth) acrylate, Di- or trialkylphenyl group-containing (meth) acrylates such as methylphenyl (meth) acrylate; benzyl methacrylate, isobornyl methacrylate, dicyclopentenyloxyethyl (meth) acrylate, phenoxyethyl methacrylate, phenoxydiethylene glycol (meth) acrylate, phenoxy Examples include triethylene glycol (meth) acrylate.

Among these, as the monomer (B), methyl (meth) acrylate and 2-ethylhexyl (meth) acrylate are particularly preferable.
These monomers (B) may be used individually by 1 type, and may use 2 or more types together.

  Content of a monomer (B) is 40-75 mass% in 100 mass% of syrup (x). If content of a monomer (B) is 40 mass% or more, the coating film which has sufficient intensity | strength can be formed. On the other hand, if content of a monomer (B) is 75 mass% or less, the coating film excellent in adhesiveness with the upper-coat layer mentioned later can be formed.

Monomer (C);
Examples of the monomer (C) include ethylene glycol di (meth) acrylate, 1,2-propylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, and 1,4-butanediol di ( (Meth) acrylate, 1,6-hexanediol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol (meth) acrylate, tetraethylene glycol dimethacrylate, polyethylene glycol di (meth) acrylate, dipropylene glycol di ( With (meth) acrylate, tripropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, polybutylene glycol di (meth) acrylate, bisphenol A with ethylene oxide Di (meth) acrylate, bisphenol A propylene oxide adduct di (meth) acrylate, bisphenol A diglycidyl ether (meth) acrylic acid adduct, neopentyl glycol di (meth) acrylate, 1,4-cyclohexanedimethanol di ( (Meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, tris (2- (meth) acryloyloxyethyl) isocyanurate, pentaerythritol tetra ( And (meth) acrylate and dipentaerythritol hexa (meth) acrylate. Among these, triethylene glycol (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, polybutylene glycol di (meth) acrylate, bisphenol A ethylene oxide adduct di (meth) acrylate, bisphenol A propylene oxide adduct di (meth) acrylate is particularly preferred.
These monomers (C) may be used individually by 1 type, and may use 2 or more types together.

  Content of a monomer (C) is 0.5-15 mass% in 100 mass% of syrup (x), and 0.5-10 mass% is preferable. If content of a monomer (C) is 0.5 mass% or more, the mechanical strength of a coating film can be improved. On the other hand, if the content of the monomer (C) is 15% by mass or less, the time until curing is not too short, and workability is improved.

Plasticizer (D);
The plasticizer (D) is blended for the purpose of improving the flexibility of the resin mortar composition.
Examples of the plasticizer (D) include phthalates such as dibutyl phthalate, diheptyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl phthalate, octyl decyl phthalate, di-n-decyl phthalate, diisodecyl phthalate, and butyl benzyl phthalate. Acid esters; di-2-ethylhexyl adipate, octyldecyl adipate, di-2-ethylhexyl sebacate, dibutyl sebacate, di-2-ethylhexyl azelate, tributyl acetyl citrate, polypropylene glycol, alkane sulfonic acid esters, chlorine Paraffin: Adipic acid, azelaic acid, sebacic acid, phthalic acid polyester polymer plasticizer; Epoxy polymer plasticizer such as epoxidized oil, epoxidized fatty acid ester, etc. It is.
These plasticizers (D) may be used individually by 1 type, and may use 2 or more types together.

Content of a plasticizer (D) is 15 mass% or less in 100 mass% of syrup (x). If content of a plasticizer (D) is 15 mass% or less, it can suppress that a plasticizer (D) exudes to the surface of a coating film, and can improve the adhesiveness of a coating film.
In addition, although there is no restriction | limiting in particular about the lower limit of content of a plasticizer (D), 5 mass% or more is preferable in order to provide sufficient followability to a resin mortar composition.

Resin (E);
The resin (E) is blended for the purpose of adjusting the viscosity of the resin mortar composition and improving the curability.
Resin (E) has a glass transition temperature (Tg) of 20 to 155 ° C. Moreover, it is preferable that it is soluble in monomer (A), (B), (C).

If Tg of resin (E) is 20 degreeC or more, the surface curability of a resin mortar composition will become favorable. On the other hand, if the Tg of the resin (E) is 155 ° C. or less, the resin (E) has good solubility in the monomers (A), (B), and (C) when preparing a resin mortar composition. It becomes.
In addition, Tg of resin (E) is the value calculated | required by the measurement of the differential scanning calorimeter (DSC).

The mass average molecular weight (hereinafter referred to as “Mw”) of the resin (E) is preferably 5,000 to 200,000, and more preferably 10,000 to 180,000. If Mw is 5,000 or more, the coating-film intensity | strength of a resin mortar composition can be improved more. On the other hand, if Mw is 200,000 or less, when preparing a resin mortar composition, the solubility of the resin (E) in the monomers (A), (B), and (C) will be good.
Mw of the resin (E) 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.

Examples of such a resin (E) include homopolymers or copolymers of alkyl (meth) acrylates, epoxy resins, cellulose acetate butyrate resins, diallyl phthalate resins, and saturated polyester resins. Among these, alkyl (meth) acrylate homopolymers or copolymers and cellulose acetate butyrate resin are preferred. These resin (E) may be used individually by 1 type, and may use 2 or more types together.
The monomer (B) mentioned above is mentioned as a monomer which comprises the homopolymer or copolymer of an alkyl (meth) acrylate.

  Content of resin (E) is 10-30 mass% in 100 mass% of syrup (x). If content of resin (E) is 10 mass% or more, while the viscosity balance of a resin mortar composition will become favorable, sclerosis | hardenability will improve. On the other hand, if content of resin (E) is 30 mass% or less, hardening time can be shortened, ensuring the pot life of a resin mortar composition.

(Aromatic tertiary amine (F))
The aromatic tertiary amine (F) serves as a curing accelerator that accelerates the curing reaction.
As the aromatic tertiary amine (F), those in which at least one aromatic residue is directly bonded to a nitrogen atom are preferable. Examples of such aromatic tertiary amines include N, N-dimethyl-p-toluidine, N, N-diethylaniline, N, N-diethyl-p-toluidine, and 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 N, N-di (2-hydroxypropyl) -p-toluidine ethylene oxide or propylene oxide adducts and the like. Moreover, it is not limited to p (para) body, o (ortho) body and m (meta) body may be sufficient. Among these, N, N-dimethyl-p-toluidine, N, N-diethyl-p-toluidine, N, N-di (2-hydroxyethyl)-from the viewpoint of reactivity and curability of the resin mortar composition P-toluidine and N, N-di (2-hydroxypropyl) -p-toluidine are preferred.
An aromatic tertiary amine (F) may be used individually by 1 type, and may use 2 or more types together.

  Content of the aromatic tertiary amine (F) in syrup composition (X) is 0.3-4 mass parts with respect to 100 mass parts of syrup (x), 0.3-2 mass parts is preferable. If content of an aromatic tertiary amine (F) is 0.3 mass part or more, the surface curability of a resin mortar composition will become favorable. On the other hand, when curing at a particularly low temperature, an appropriate pot life can be obtained by adjusting the content of the aromatic tertiary amine (F) to 4 parts by mass or less.

(Wax (G))
The wax (G) has an effect of improving the surface curability using an air blocking effect.
Examples of the wax (G) include solid waxes. Examples of solid waxes include higher fatty acids such as paraffins, polyethylenes, and stearic acid. Among these, paraffins are preferable.

  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. If melting | fusing point is 40 degreeC or more, when the resin mortar composition is paint-hardened, sufficient air blocking effect will be obtained and surface curability will become favorable. On the other hand, when the melting point is 80 ° C. or lower, the dispersibility of the paraffin wax in the monomers (A), (B), and (C) becomes good when preparing the resin mortar composition. Further, by using the paraffin wax in combination, when the resin mortar composition is paint-cured, even when the base temperature is changed, a sufficient air blocking action is obtained, and the surface curability is improved. When using together, it is preferable to use together that whose melting | fusing point difference is about 5 to 20 degreeC.

As the wax (G), a wax dispersed in an organic solvent may be used from the viewpoint of improving surface curability. When the wax is in a dispersed state in the organic solvent and is finely divided, the air blocking action can be effectively expressed, and excellent adhesion can be imparted to the coating film.
Examples of the wax in the dispersed state include a mixture of hydroxy polyester and paraffin wax. A commercially available product can be used as the wax in the dispersed state, and for example, “BYK-S740” manufactured by Big Chemie Japan Co., Ltd. is preferable.
In addition, when using the wax of a dispersed state as wax (G), the resin mortar composition of this invention will also contain an organic solvent.
Further, the dispersed wax may be one in which the wax is dispersed in the monomers (A), (B), and (C) without containing an organic solvent.

  Content of the wax (G) in syrup composition (X) is 0.1-2.5 mass parts with respect to 100 mass parts of syrup (x), and 0.1-1 mass part is preferable. When the content of the wax (G) is 0.1 parts by mass or more, a sufficient air barrier action is obtained when the resin mortar composition is cured by coating, and the surface curability is improved. On the other hand, if the content of the wax (G) is 2.5 parts by mass or less, the wax can be stably dispersed without agglomerating in the resin composition containing no aggregate, and the resin mortar composition Contamination resistance when coating is cured is improved.

(Other ingredients)
The syrup composition (X) may contain other components other than the components described above as long as the effects of the present invention are not impaired.
Examples of other components include polyvalent metal soaps, polymerization initiators, silane coupling agents, polymerization inhibitors, UV absorbers or light stabilizers, and antifoaming agents.

Polyvalent metal soap;
Examples of the polyvalent metal soap include cobalt naphthenate, cobalt octylate, cobalt acetoacetylate, manganese naphthenate, nickel octylate and the like.
As the polyvalent metal soap, cobalt naphthenate and cobalt octylate are preferable from the viewpoint of obtaining an appropriate pot life and good curability.
A polyvalent metal soap may be used individually by 1 type, and may use 2 or more types together.

The content of the polyvalent metal soap in the syrup composition is preferably 0 to 0.5% by mass in 100% by mass of the syrup composition (X). By blending a polyvalent metal soap, even better curability can be obtained.
However, if the content of the polyvalent metal soap is too large, the amount of the solvent in which the polyvalent metal soap is dispersed and dissolved increases, so the curability tends to decrease or the strength of the cured coating film tends to decrease. is there. Therefore, the upper limit of the content of the polyvalent metal soap is preferably 0.5% by mass or less, and more preferably 0.4% by mass or less.
In addition, in this invention, "content of polyvalent metal soap" is content of the metal originating in polyvalent metal soap.

A polymerization initiator;
In order to cure the resin mortar composition of the present invention, it is preferable to use a redox catalyst in which an aromatic tertiary amine (F) or the above-described polyvalent metal soap is combined with a curing agent.
Examples of the curing agent include known polymerization initiators that can initiate radical polymerization. Examples of the polymerization initiator include diacyl peroxide, hydroperoxide, alkyl peroxide, ketone peroxide, and azo compound. Among these, diacyl peroxide is preferable, and benzoyl peroxide is particularly preferable. 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 use 2 or more types together.

The addition amount of the curing agent is preferably adjusted as appropriate so that the pot life of the resin mortar composition is 10 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 resin mortar composition will advance.
The content of benzoyl peroxide is preferably 0.25 to 5 parts by mass and more preferably 0.25 to 4 parts by mass with respect to 100 parts by mass of syrup (x). If content of benzoyl peroxide is 0.25 mass part or more, it exists in the tendency for sclerosis | hardenability to become favorable. In particular, when curing at low temperatures, if the content of benzoyl peroxide is adjusted to 5 parts by mass or less, the coating workability of the resin mortar composition and the various physical properties of the resulting coating film tend to be improved.

Silane coupling agent;
The silane coupling agent has an effect of improving adhesion to an undercoat layer, which will be described later, and an adhesive force with the aggregate to be blended, and plays a role of improving the breaking strength when the aggregate is blended.
Examples of the silane coupling agent include 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, and 3-acryloxypropyl. Examples include trimethoxysilane.

Moreover, as silane coupling agents other than those described above, a silane coupling agent having one vinyl group in the molecule, a silane coupling agent having an epoxy group in the molecule, and a silane coupling agent having amino in the molecule A silane coupling agent having ureido in the molecule, a silane coupling agent having mercapto in the molecule, a silane coupling agent having sulfide in the molecule, a silane coupling agent having isocyanate in the molecule, or the like can be used.
Examples of the silane coupling agent having one vinyl group in the molecule include vinyltrimethoxysilane and vinyltriethoxysilane.
Examples of the silane coupling agent having an epoxy group in the molecule include 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3 -Glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, etc. are mentioned.

  The content 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. If content of a silane coupling agent is 10 mass parts or less, surface curability will become favorable, hold | maintaining stabilization of the adhesiveness to the undercoat layer of a resin mortar composition.

Polymerization inhibitor;
The polymerization inhibitor is blended for the purpose of improving the storage stability of the resin mortar composition 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.
0.001-0.2 mass part is preferable with respect to 100 mass parts of syrup (x), and, as for content of a polymerization inhibitor, 0.002-0.1 mass part is more preferable.

UV absorber or light stabilizer;
Examples of the ultraviolet absorber include 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-octyloxybenzophenone, 2-hydroxy-4-decyloxybenzophenone, 2-hydroxy-4,4′-dimethoxybenzophenone, 2-hydroxy- Derivatives of 2-hydroxybenzophenone such as 4,4′-dibutoxybenzophenone or 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-ditertiary Butylphenyl) benzotriazole or a halide thereof, phenyl salicylate, p-tertiarybutylphenyl salicylate, and the like. These ultraviolet absorbers may be used alone or in combination of two or more.
On the other hand, as the light stabilizer, for example, 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 light stabilizers may be used alone or in combination of two or more.

Antifoaming agent;
Examples of the antifoaming agent include known antifoaming agents. Specific examples include an acrylic defoamer obtained by dissolving a special acrylic polymer in a solvent, a vinyl defoamer obtained by dissolving a special vinyl polymer in a solvent, and the like from Enomoto Kasei Co., Ltd. Disparon 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.), etc., among the disparon series, 230, 230HF, LF-1980 and LF-1985 are more preferable, and 230 and LF-1985 are particularly preferable. Further, BYK-052 and BYK-1752 commercially available from Big Chemie Japan Co., Ltd. can also be used.

Other;
Moreover, syrup composition (X) may contain thixotropic agents, such as antioxidant, a leveling agent, and an aerosil, in arbitrary ratios.
Furthermore, inorganic pigments such as chromium oxide, bengara and iron oxide, and organic pigments such as phthalocyanine blue may be added at an arbitrary ratio, and a quality pigment such as calcium carbonate may be used.

<Aggregate (H)>
The resin mortar composition of this invention mix | blends an aggregate (H) with the syrup composition (X) mentioned above.
The aggregate (H) is a component that imparts strength to the coating film obtained from the resin mortar composition.
Examples of the aggregate (H) include natural mineral ores such as sand, dredged sand, river sand, cryogenic stone, emery, marble, alumina, slag, glass, ceramic aggregate, pottery, porcelain, tile, glass beads, colored aggregate, etc. Is mentioned.
These aggregates (H) may be used alone or in combination of two or more.

  The compounding quantity of aggregate (H) is 150-800 mass parts with respect to 100 mass parts of syrup (x) in syrup composition (X), and 150-700 mass parts is preferable. When the blending amount of the aggregate (H) is 150 parts by mass or more, sufficient strength can be imparted to the coating film and the shape stability of the coating film can be maintained well. On the other hand, if the content of the aggregate (H) is 800 parts by mass or less, the coating workability of the resin mortar composition can be favorably maintained.

<Effect>
The resin mortar composition of the present invention described above includes a specific amount of an aromatic tertiary amine (F) and a wax in a syrup (x) containing a specific amount of monomers (A), (B), and (C). Since the aggregate is blended with the syrup composition combined with (G), a coating film having high strength and excellent adhesion to the topcoat layer can be formed.

<Application>
The resin mortar composition of the present invention is suitable as a covering material such as a floor surface, a wall surface, and a road pavement surface made of concrete or asphalt.
The resin mortar composition of the present invention may be applied directly on a coating surface such as the floor surface, wall surface, road pavement, etc. described above, or an undercoat layer is provided on the coating surface in advance. You may paint on. Furthermore, an overcoat layer may be provided on the coating film made of the resin mortar composition of the present invention for the purpose of design or protection.

[Coating]
The coating of the present invention has an undercoat layer, an intermediate coat layer, and an overcoat layer.

<Undercoat layer>
The undercoat layer is composed of a cured product of a syrup composition (Y) containing syrup (y), an aromatic tertiary amine (F), and a wax (G).
Syrup (y) contains a monomer (B), a monomer (C), and a resin (E ′) having a glass transition temperature of 20 to 155 ° C.
Examples of the monomer (B) and the monomer (C) contained in the syrup (y) include the monomer (B) and the monomer (C) exemplified above in the description of the syrup (x). .
The resin (E ′) contained in the syrup (y) is preferably a resin that is soluble in the monomer (B) and the monomer (C). As such a resin, for example, syrup (x The resin (E) exemplified above in the description of).

  Content of a monomer (B) is 50-85 mass% in 100 mass% of syrup (y), and 60-85 mass% is preferable. If content of a monomer (B) is 50 mass% or more, the viscosity of a syrup composition (Y) will become low enough, and workability | operativity will become favorable. On the other hand, if content of a monomer (B) is 85 mass% or less, sclerosis | hardenability of a syrup composition (Y) will become favorable and sufficient intensity | strength can be provided to an undercoat layer.

Content of a monomer (C) is 20 mass% or less in 100 mass% of syrup (y), and 15 mass% or less is preferable. If content of a monomer (C) is 20 mass% or more, the time until it will harden | cure will not become short too much, but workability | operativity will become favorable.
In addition, although it does not restrict | limit especially about the lower limit of content of a monomer (C), 0.5 mass% or more is preferable.

  Content of resin (E ') is 10-35 mass% in 100 mass% of syrup (y), and 15-35 mass% is preferable. If content of resin (E ') is 10 mass% or more, sclerosis | hardenability of a syrup composition (Y) will become favorable. On the other hand, when the content of the resin (E ′) is 35% by mass or less, the viscosity of the syrup composition (Y) is sufficiently low, and the coating workability is improved.

Examples of the aromatic tertiary amine (F) contained in the syrup composition (Y) include the aromatic tertiary amine (F) exemplified above in the description of the syrup composition (X).
Content of the aromatic tertiary amine (F) in a syrup composition (Y) is 0.3-4 mass parts with respect to 100 mass parts of syrup (y), and 0.3-2 mass parts is preferable. If content of an aromatic tertiary amine (F) is 0.3 mass part or more, the surface curability of a syrup composition (Y) will become favorable. On the other hand, when curing at a particularly low temperature, an appropriate pot life can be obtained by adjusting the content of the aromatic tertiary amine (F) to 4 parts by mass or less.

Solid waxes are mentioned as wax (G) contained in a syrup composition (Y). Examples of solid waxes include higher fatty acids such as paraffins, polyethylenes, and stearic acid. Among these, paraffins are preferable.
As paraffin wax, the paraffin wax illustrated previously in description of syrup composition (X) is mentioned.

  Content of the wax (G) in a syrup composition (Y) is 0.1-2.5 mass parts with respect to 100 mass parts of syrup (y), and 0.1-1 mass part is preferable. When the content of the wax (G) is 0.1 parts by mass or more, when the syrup composition (Y) is coated and cured, a sufficient air blocking action is obtained, and the surface curability is improved. On the other hand, if the content of the wax (G) is 2.5 parts by mass or less, the wax can be stably dispersed without agglomeration in the resin composition of the syrup composition (Y) not including the aggregate. In addition, the stain resistance when the syrup composition (Y) is cured by coating is improved.

The syrup composition (Y) may contain other components other than the components described above.
Examples of the other components include the polyvalent metal soap, the polymerization initiator, the silane coupling agent, the polymerization inhibitor, the ultraviolet absorber, the light stabilizer, the antifoaming agent, and the like exemplified above in the description of the syrup composition (X). Can be mentioned.

<Inner coating layer>
The intermediate coating layer is composed of a cured product (coating film) of the resin mortar composition of the present invention described above.

<Overcoat layer>
The topcoat layer is made of a cured product of the syrup composition (Y) described above. The syrup composition (Y) constituting the topcoat layer may be the same composition as the syrup composition (Y) constituting the undercoat layer, or may be a different composition. Moreover, since an overcoat layer is located in the outermost layer, it is preferable that the syrup composition (Y) which comprises an overcoat layer contains a ultraviolet absorber as another component.

<Formation method of coating>
The coating of the present invention is used as a coating on a floor surface, wall surface, road pavement surface, or the like made of concrete or asphalt.
As a method for coating construction surfaces such as floor surfaces, wall surfaces, and road paving surfaces, for example, a syrup composition (Y) is applied to the coated surface to form an undercoat layer, and the resin of the present invention is formed on the undercoat layer. Examples thereof include a method in which a mortar composition is applied to form an intermediate coating layer, and syrup (y) or syrup composition (Y) is applied on the intermediate coating layer to form an upper coating layer.
When applying a syrup composition (Y) or a resin mortar composition, the undercoat layer is 0.1 to 1 mm, the intermediate coat layer is 1 to 100 mm, and the overcoat layer is 0.1 to 2 mm. It is preferable to do this.

Examples of the coating means include known coating methods using a roller, a gold trowel, a brush, a flexible bow, a coating machine (such as a spray coating machine), and the like.
The aromatic tertiary amine (F) and the polyvalent metal soap may be added immediately before the syrup composition (Y) or the resin mortar composition is cured, and the syrup composition (Y) or the resin mortar composition may be added in advance. It may be added to the product.
Moreover, it is preferable to add a polymerization initiator just before hardening a syrup composition (Y) or a resin mortar composition.

<Effect>
Since the coating of the present invention includes an intermediate coating layer made of a cured product of the resin mortar composition of the present invention, it has excellent adhesion to the top coating layer. Further, since the intermediate coating layer has high strength, the strength of the entire coating is improved.

  In the covering of the present invention, other layers may be provided between the construction surface and the undercoat layer, between the undercoat layer and the intermediate coat layer, and on the overcoat layer.

  Hereinafter, the present invention will be described with reference to examples and comparative examples. In the following examples, “part” means “part by mass”, and “%” means “mass%”.

[Preparation of syrup composition]
<Preparation of syrup composition (Y-1)>
In a 1 L flask equipped with a stirrer, a thermometer, and a condenser tube, 58.0 parts of methyl methacrylate (hereinafter abbreviated as “MMA”) as monomer (B) and 2-ethylhexyl acrylate (hereinafter abbreviated as “2-EHA”) 10.0 parts, 2.0 parts of triethylene glycol dimethacrylate (manufactured by Mitsubishi Rayon Co., Ltd., trade name: acrylate 3ED (hereinafter abbreviated as “acrylate 3ED”)) as a monomer (C), and polymerization prohibition 0.026 part of 2-6-di-t-butyl 4-methylphenol (hereinafter abbreviated as “BHT”) as an agent, and paraffin-115 (manufactured by Nippon Seiwa Co., Ltd., paraffin wax (hereinafter “BHT”) as wax (G) 0.4 parts, paraffin-130 (manufactured by Nippon Seiwa Co., Ltd., paraffin wax (hereinafter abbreviated as “P-130”)). Parts, and 0.2 parts of paraffin-150 (manufactured by Nippon Seiwa Co., Ltd., paraffin wax (hereinafter abbreviated as “P-150”)) and an antifoaming agent (manufactured by BYK Japan Japan, trade name: BYK-1752) ) 0.5 part and 1.0 part of N, N-di (2-hydroxyethyl) -p-toluidine (hereinafter abbreviated as “PTEO”) as the aromatic tertiary amine (F) were added and stirred. However, 30.0 parts of MMA / n-butyl methacrylate (hereinafter abbreviated as “n-BMA”) = 60/40 copolymer (Tg = 64 ° C., Mw = 40,000) was added as resin (E). . Then, it melt | dissolved by heating at 60 degreeC for 2 hours. After confirming dissolution, the solution was cooled to obtain a syrup composition (Y-1) for an undercoat layer. Table 1 shows the composition of the obtained syrup composition (Y-1).

<Preparation of syrup composition (X-1)>
In a 1 L flask equipped with a stirrer, thermometer and condenser, 15.5 parts of 2-hydroxypropyl methacrylate (hereinafter abbreviated as “2-HPMA”) as monomer (A) and MMA as monomer (B) 33.3 parts, 16.4 parts of 2-EHA, and polybutylene glycol dimethacrylate (manufactured by Mitsubishi Rayon Co., Ltd., trade name: acrylate PBOM (hereinafter abbreviated as “PBOM”)) as monomer (C) 2.0 parts, 5.4 parts of vinylizer 85 (Kao Corporation, phthalate plasticizer) and plasticizer 105 (Kao Corporation, phthalate plasticizer) as plasticizer (D) 4 parts, 0.1 part of BHT as a polymerization inhibitor, 0.2 part of P-130 as a wax (G), N, N-di (2-hydroxy) as an aromatic tertiary amine (F) (Lopyl) -p-toluidine (hereinafter abbreviated as “DIPT”) (1.0 part) was added, and while stirring, a copolymer of MMA / n-BMA = 60/40 (Tg = 64 ° C.) 26.0 parts of Mw = 40,000). Then, it melt | dissolved by heating at 60 degreeC for 2 hours. After confirming dissolution, the mixture was cooled to obtain a syrup composition (X-1) for an intermediate coating layer. Table 1 shows the composition of the obtained syrup composition (X-1).

<Preparation of syrup compositions (X-2) to (X-6)>
Syrup compositions (X-2) to (X-6) were obtained in the same manner as in the preparation of the syrup composition (X-1) except that the composition shown in Table 1 was used.

<Preparation of syrup composition (Y-2)>
In a 1 L flask equipped with a stirrer, thermometer and condenser, 42.1 parts of MMA as monomer (B) and 31.6 parts of n-BMA and polyethylene glycol dimethacrylate (C) as monomer (C) Shin-Nakamura Chemical Co., Ltd., trade name: NK ester 14G (hereinafter abbreviated as “NK ester 14G”) 5.3 parts, BHT as polymerization inhibitor 0.025 parts, and wax (G) as P- 0.5 part 115, 0.3 part P-130, 0.2 part P-150, 0.5 part BYK-1752 as antifoaming agent, DIPT as aromatic tertiary amine (F) 1.0 part, tridecyl phosphite (manufactured by Johoku Chemical Industry Co., Ltd., trade name JP-310 (hereinafter abbreviated as “JP-310”)) as an antioxidant, and 2 parts as an ultraviolet absorber. -(2'-hydroxy-5- MMA / n as resin (E) was added with stirring after 0.2 parts of methylphenyl) benzotriazole (manufactured by Johoku Chemical Industry Co., Ltd., trade name JF-77 (hereinafter abbreviated as “JF-77”)) was added. -21.0 parts of BMA = 60/40 copolymer (Tg = 64 ° C., Mw = 160,000) was added, and then dissolved by heating at 60 ° C. for 2 hours. Thus, a syrup composition (Y-2) for the topcoat layer was obtained, and the composition of the obtained syrup composition (Y-2) is shown in Table 1.

The symbols in Table 1 are as follows.
2-HPMA: 2-hydroxypropyl methacrylate,
2-HEMA: 2-hydroxyethyl methacrylate,
6-HHMA: 6-hydroxyhexyl methacrylate,
MMA: methyl methacrylate,
N-BMA: n-butyl methacrylate,
2-EHA: 2-ethylhexyl acrylate,
PBOM: polybutylene glycol dimethacrylate (Mitsubishi Rayon Co., Ltd., trade name: acrylate PBOM),
Acryester 3ED: Triethylene glycol dimethacrylate (manufactured by Mitsubishi Rayon Co., Ltd., trade name: Acryester 3ED),
NK ester 14G: polyethylene glycol dimethacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: NK ester 14G),
-Vinicizer 85: Phthalic acid ester plasticizer (trade name: Vinicizer 85, manufactured by Kao Corporation),
Vinicizer 105: Phthalic acid ester plasticizer (trade name: Vinicizer 105, manufactured by Kao Corporation),
Toyoparax 150: Chlorinated paraffin (manufactured by Tosoh Corporation, trade name: Toyoparax 150),
Polymer 1: MMA / n-BMA = 60/40 copolymer (Tg = 64 ° C., Mw = 40,000),
Polymer 2: MMA / n-BMA = 60/40 copolymer (Tg = 64 ° C., Mw = 160,000),
Polymer 3: MMA / MA = 92.5 / 7.5 copolymer (Tg = 87 ° C., Mw = 80,000),
DIPT: N, N-di (2-hydroxypropyl) -p-toluidine,
PTEO: N, N-di (2-hydroxyethyl) -p-toluidine,
DMPT: N, N-dimethyl-p-toluidine,
-P-115: Paraffin wax (manufactured by Nippon Seiwa)
P-130: Paraffin wax (Nippon Seiwa Co., Ltd.),
-P-150: Paraffin wax (Nippon Seiwa Co., Ltd.),
BHT: 2-6-di-t-butyl 4-methylphenol,
BYK-1752: Antifoaming agent (BIC Chemie Japan Co., Ltd., trade name: BYK-1752),
JP-310: Tridecyl phosphite (Johoku Chemical Industry Co., Ltd., trade name: JP-310),
JF-77: 2- (2′-hydroxy-5-methylphenyl) benzotriazole (manufactured by Johoku Chemical Industry Co., Ltd., trade name: JF-77).

[Example 1]
<Preparation of resin mortar composition>
With respect to 100 parts of the syrup composition (X-1), a benzoyl peroxide 50% granule product (manufactured by Kayaku Akzo Co., Ltd., trade name: Parkadox CH-50L (hereinafter referred to as “CH-50L”) as a polymerization initiator Abbreviated))) 2 parts added, after stirring and mixing, the aggregate (trade name: KM-17A, manufactured by Ryokan Co., Ltd.) with respect to 100 parts of syrup (x) in the syrup composition (X-1) 400 parts was added and sufficiently stirred to obtain a resin mortar composition.
About the obtained resin mortar composition, the measurement of a viscosity and hardening time, the coating workability | operativity, sclerosis | hardenability, and adhesiveness evaluation, and the measurement of compressive strength were performed as follows. The results are shown in Table 2. In addition, since a viscosity and hardening time are hard to be influenced by the presence or absence of addition of an aggregate, about these measurements, it measured about the syrup composition (X-1).

<Measurement and evaluation method>
(Measurement of viscosity)
After leaving the syrup composition (X-1) in a constant temperature water bath at 23 ° C. for 2 hours, using the BM type viscometer of type 1 in the Brookfield type viscometer described in JIS K 6901, the syrup composition ( The viscosity of X-1) was measured.

(Measurement of curing time)
After leaving the syrup composition (X-1) in a constant temperature water bath at 23 ° C. for 2 hours, 2 parts of CH-50L as a polymerization initiator was added to 100 parts of the syrup composition (X-1), After sufficiently stirring, this was put into a position 7 cm from the bottom of a test tube (length 12 cm) having an inner diameter of 10 mm. Then, a test tube was again placed in a constant temperature water bath at 23 ° C., a thermocouple was placed in the center thereof, and a temperature change due to polymerization heat generation was recorded. At this time, the time required to reach the maximum exothermic temperature after adding the polymerization initiator was taken as the curing time (minutes).
Those having a curing time of 120 minutes or less are preferable from the viewpoint of work in the case of recoating, and those having a curing time of 60 minutes or less are more preferable.

(Evaluation of paint workability)
To 100 parts of the syrup composition (Y-1), 2 parts of CH-50L was added as a polymerization initiator and stirred and mixed. This was coated with a roller on a JIS mortar plate (30 cm × 30 cm × thickness 6 cm) as a base material in an atmosphere of 23 ° C. so that the thickness of the coating film became 0.3 mm. An undercoat layer was formed. After 1 hour, it was confirmed that the surface of the coating film (undercoat layer) had no stickiness and was cured.
Next, the resin mortar composition was applied onto the undercoat layer using a trowel so that the thickness of the coating film was 5 mm, thereby forming an intermediate coat layer on the undercoat layer. The resin mortar composition was prepared immediately before coating on the undercoat layer.
The coating workability when the resin mortar composition was coated on the undercoat layer was evaluated based on the following evaluation criteria.
○: Good.
X: Coating unevenness occurs.

(Evaluation of curability)
In the same manner as in the evaluation of the coating workability, the curability of the surface of the coating film (intercoat layer) after one hour has passed since the resin mortar composition was applied on the undercoat layer was confirmed by touch, and the following Evaluation was performed based on the evaluation criteria.
○: No tack.
X: There is tack.

(Evaluation of adhesion)
Similarly to the evaluation of the coating workability, the resin mortar composition was applied onto the undercoat layer and cured to form an intermediate coat layer.
Next, with respect to 100 parts of the syrup composition (Y-2), 3 parts of CH-50L as a polymerization initiator was added, stirred and mixed so that the thickness of the coating film became 0.3 mm. Immediately, the intermediate coating layer was coated with a roller and cured to obtain a test piece in which the substrate surface was coated with a coating in which an undercoat layer, an intermediate coating layer, and an upper coating layer were sequentially laminated.
The obtained test piece is allowed to stand for 24 hours or more in an environment of 23 ° C., and is cut to a width of 4 mm according to JIS-K5600-5-6, and then a gummed tape (Nitto Denko Corporation, trade name: cloth adhesive tape). No. 750) was used for the adhesion test. Then, based on the criteria described in JIS-K5600-5-6, the test results were classified into 0 to 5 to evaluate the adhesion.

(Measurement of compressive strength)
The resin mortar composition was poured into a triple mold described in JIS-R5201, and cured to obtain a cured product of the resin mortar composition.
The obtained cured product was divided by a portion having a length of about 8 cm and left in a constant temperature bath at 20 ° C. for 4 hours, and then subjected to a compression test described in JIS-R5201, to measure the compression strength.

[Examples 2-4, Comparative Examples 1-2]
A resin mortar composition was prepared in the same manner as in Example 1 except that the syrup composition (X-1) was changed to syrup compositions (X-2) to (X-6), and various measurements and evaluations were made. went. The results are shown in Table 2.
In addition, the quantity of the aggregate in Table 2 is the quantity with respect to 100 parts of syrup (x) in a syrup composition.

The symbols in Table 2 are as follows.
CH-50L: Benzoyl peroxide 50% granule (manufactured by Kayaku Akzo Co., Ltd., trade name: Parkadox CH-50L),
-KM-17A: Aggregate (manufactured by Ryohin Co., Ltd., trade name: KM-17A)

As is clear from Table 2, the resin mortar compositions obtained in Examples 1 to 4 were excellent in coating workability and curability. The syrup compositions (X-1) to (X-4) used in this resin mortar composition had a curing time of 23 to 30 minutes and were suitable for work.
Furthermore, the intermediate coating layer formed from each resin mortar composition was excellent in adhesiveness with the top coating layer. Moreover, the hardened | cured material of each resin mortar composition was high compression strength.
Therefore, it was shown that the resin mortar composition of the present invention can form a coating film having high strength and excellent adhesion to the topcoat layer.

On the other hand, the resin mortar compositions obtained in Comparative Examples 1 and 2 using the syrup composition (X-5) and (X-6) containing syrup (x) not containing the monomer (A), The compressive strength of the cured product was low. In particular, in the case of Comparative Example 2 in which the content of the plasticizer (D) in 100% by mass of syrup (x) was as large as 20% by mass, it was formed from a resin mortar composition. The intermediate coating layer was inferior in adhesion to the top coating layer.

Claims (2)

10 to 30% by mass of a hydroxyalkyl (meth) acrylate monomer (A) having one or more hydroxyalkyl groups having 2 to 12 carbon atoms in the molecule and a single (meth) acryloyl group in the molecule 40 to 75% by mass of the monomer (B) (excluding the hydroxyalkyl (meth) acrylate monomer (A)), and a monomer having two or more (meth) acryloyl groups in the molecule ( C) (however, the hydroxyalkyl (meth) acrylate monomer (A) is excluded) 0.5 to 15% by mass, the plasticizer (D) is 5 to 15 % by mass , and the glass transition temperature is 20 to 155. ℃ resin (E) unrealized 10 to 30 mass% is, the the monomer (B) syrup (x) containing methyl methacrylate 33 to 75% by mass,
A syrup composition containing 0.3 to 4 parts by mass of an aromatic tertiary amine (F) and 0.1 to 2.5 parts by mass of a wax (G) with respect to 100 parts by mass of the syrup (x) ( X)
The resin mortar composition which mix | blended 150-800 mass parts of aggregates (H) with respect to 100 mass parts of syrup (x) in this syrup composition (X). 50 to 85% by mass of the monomer (B) having one (meth) acryloyl group in the molecule, and 20% by mass of the monomer (C) having two or more (meth) acryloyl groups in the molecule Hereinafter, syrup (y) containing 10 to 35% by mass of a resin (E ′) having a glass transition temperature of 20 to 155 ° C.,
A syrup composition containing 0.3 to 4 parts by mass of an aromatic tertiary amine (F) and 0.1 to 2.5 parts by mass of a wax (G) with respect to 100 parts by mass of the syrup (y) ( An undercoat layer made of a cured product of Y),
An intermediate coating layer comprising a cured product of the resin mortar composition according to claim 1;
A coating in which an overcoat layer made of a cured product of the syrup composition (Y) is sequentially laminated.