JP5224904B2 - Synthetic resin emulsion composition and coating composition for ceramic siding board using the same - Google Patents

Description

The present invention relates to a ceramic resin siding board, particularly a synthetic resin emulsion composition that has excellent adhesion to a site where efflorescence has occurred and can impart good water permeability resistance and frost damage resistance. And a coating composition for ceramic siding boards using the same.

Ceramic coating siding boards used as interior and exterior wall materials are usually coated with a top coat for the purpose of makeup and protection. Then, in order to improve the adhesion of the top coat and improve the finished appearance, a sealer is applied for the surface treatment.

The main performance required for such a sealer is that it has good adhesion to the substrate, has excellent permeability to the substrate, has a reinforcing effect on the surface of the substrate, and has good adhesion to the top coating. Can be mentioned. In ceramic siding boards, the occurrence of efflorescence derived from cement, which is the raw material of the base material, is unavoidable. If there is a period until the sealer is painted after the board is formed, the adhesion of the sealer will occur due to the generated efflorescence. There is a case in which the phenomenon of remarkably lowering occurs, and improvement in adhesion to the efflorescence surface is desired.

As sealers, water-based sealers and solvent-based sealers are currently widely used. Water-based sealers, especially synthetic resin emulsion-based sealers, are advantageous in terms of handling and safety during work compared to solvent-based sealers, but especially when applied to ceramic siding boards with a dense surface, efflorescence is particularly low. If it occurs on the surface, the synthetic resin particles that are dispersoids do not penetrate into the interior and remain on the surface, and it may be difficult to obtain sufficient adhesion, water permeability resistance and frost damage resistance.

In order to solve these problems, methods for making emulsion fine particles, blending water-soluble resins, and mixing water-soluble inorganic compounds such as sodium silicate are being studied.

However, there is a limit to making the emulsion fine particles, and it is difficult to make fine particles until sufficient permeability is obtained.

Japanese Patent Laid-Open No. 63-110782 (Patent Document 1) proposes a method of blending sodium silicate with a carboxyl group-containing acrylic ester resin emulsion. However, in order to obtain good adhesion to the siding board, it is necessary to use a large amount of sodium silicate, and a decrease in water resistance due to this is inevitable. Further, a sufficient penetration effect cannot be obtained on the surface where efflorescence is generated, and satisfactory performance is difficult to obtain in adhesion and water resistance.

Japanese Patent Laid-Open No. 9-328375 (Patent Document 2) proposes a method of blending sodium silicate and a tetramethoxysilane oligomer into a carboxyl group-containing synthetic resin emulsion. Among them, a method has been proposed in which sodium silicate and a tetramethoxysilane oligomer are condensed in advance, and a carboxyl group-containing synthetic resin emulsion is added thereto. Japanese Patent No. 3814706 (Patent Document 3) discloses a water-dispersible resin obtained by copolymerizing an unsaturated organic acid and an ethylenically unsaturated monomer, and an unsaturated carboxylic acid and an ethylenically unsaturated monomer. A method of blending a polymerized water-soluble resin and a crosslinkable resin having a functional group that reacts with a carboxyl group has been proposed. However, it is difficult to raise the balance between adhesion to a siding board and water permeability to a level that can be practically used, regardless of which method is used. Moreover, it is difficult to obtain a sufficient penetration effect on the efflorescence surface. Furthermore, when the composition is used as a paint in which pigments and the like are dispersed for the purpose of imparting design properties to the siding board, the above composition leaves a major problem in long-term storage stability in the form of a paint.

Further, JP-A No. 11-35878 (Patent Document 4) discloses a tertiary amino group-containing ethylenically unsaturated monomer, an α, β-unsaturated carboxylic acid or a salt thereof, and (meth) acrylic acid (cyclohexane). An aqueous sealer for reinforcing a surface layer of a porous inorganic building material comprising an aqueous dispersion of a copolymer having an alkyl ester as an essential constituent monomer has been proposed. Patent Document 4 describes that sodium tripolyphosphate may be added to an aqueous sealer, but there is no description about the amount added, and sufficient adhesion and water permeation resistance on the efflorescence surface can be obtained. is not.

By the way, JP-A-5-148446 (Patent Document 5) and JP-A-2002-226668 (Patent Document 6) describe adding a polymerized phosphate to an aqueous dispersion of an acrylic polymer. Yes. However, it is not used for sealers such as siding boards, and the amount of addition is not sufficient, so that sufficient adhesion and water permeation resistance on the efflorescence surface are not ensured.

Japanese Unexamined Patent Publication No. Sho 63-310782 JP 9-328375 A Japanese Patent No. 3814706 Japanese Patent Laid-Open No. 11-35878 JP-A-5-148446 JP 2002-226668 A

An object of the present invention is to provide a synthetic resin emulsion composition having excellent adhesion, good water permeability resistance and frost damage resistance to a ceramic siding board, particularly a site where efflorescence is generated.

As a result of intensive research, the present inventors have generated ceramic siding boards, especially efflorescence, by blending polymer phosphates with synthetic resin emulsions composed of (meth) acrylic ester copolymer resins. The present inventors have found that they have excellent adhesion and can impart good water permeation resistance, frost damage resistance, and the like.

That is, the present invention provides a polymer obtained by polymerizing an (A) (meth) acrylic acid alkyl ester monomer and / or an unsaturated monomer copolymerizable with a (meth) acrylic acid alkyl ester monomer. the resin solid content of 100 parts by weight of synthetic resin emulsion consisting of, (B) polymerized phosphate viewed contains 3 to 50 parts by mass, the the monomer in 100 parts by mass of a polymer unsaturated carboxylic acid 0 The present invention relates to a synthetic resin emulsion composition containing 5 to 10 parts by mass and 0.5 to 10 parts by mass of an unsaturated monomer having a glycidyl group .

Further, it has been found that the polymer can impart further excellent performance by including an unsaturated carboxylic acid and an unsaturated monomer having a glycidyl group in the monomer component.

Furthermore, this invention relates to the coating composition for ceramics type | system | group siding boards containing the said synthetic resin emulsion composition.

According to the present invention, a synthesis comprising a polymer obtained by polymerizing an (meth) acrylic acid alkyl ester monomer and / or an unsaturated monomer copolymerizable with a (meth) acrylic acid alkyl ester monomer. By blending the polymer phosphate (B) with the resin emulsion (A), the ceramic siding board, particularly with respect to the site where efflorescence has occurred, has excellent adhesion, and good water permeability and Can give frost damage resistance. In addition, the synthetic resin emulsion (A) contains an unsaturated carboxylic acid and a polymer composed of an unsaturated monomer having a glycidyl group, thereby further improving adhesion, water permeability resistance and frost damage resistance. I can do it.

The present invention is described in detail below. In the present invention, a synthetic resin emulsion composed of a polymer obtained by polymerizing an unsaturated monomer copolymerizable with a (meth) acrylic acid alkyl ester monomer and / or a (meth) acrylic acid alkyl ester monomer ( It is essential that the polymerized phosphate (B) is blended with A). Polymerized phosphate is a compound in which a plurality of phosphoric acids are bonded, and typical compounds include sodium tripolyphosphate, sodium hexametaphosphate, and sodium pyrophosphate. Conventionally, polymerized phosphates have been widely used as pigment dispersants in paints. Polyphosphate is introduced as a dispersant for water-based paints in the “Paint Raw Materials Handbook” (edited by the Japan Paint Manufacturers Association). Has been. However, in the “Handbook of paint blending” (Polymer Publications), potassium tripolyphosphate is described as an example of paint blending. When polymerized phosphate is used as a dispersant, the amount used is a binder. It is at most 0.1 to 0.5 parts by mass with respect to 100 parts by mass of the resin. If the amount used is within this range, it is effective for pigment dispersion, but it does not reach the point where good adhesion to a siding board is exhibited. The type of the polymerized phosphate (B) used in the present invention is not particularly limited. Sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, sodium tetrapolyphosphate, sodium pentapolyphosphate, pyrophosphoric acid Examples include potassium, sodium metaphosphate, and potassium metaphosphate. These may be used alone or in combination of two or more. These may be added either during emulsion polymerization or after completion of emulsion polymerization. Of these, sodium tripolyphosphate, sodium hexametaphosphate, and sodium pyrophosphate are preferable in terms of adhesion to the site where efflorescence is generated, water permeability resistance, and frost damage resistance.

Moreover, the compounding quantity of superposition | polymerization phosphate (B) is 3-50 mass parts with respect to 100 mass parts of resin solid content of a synthetic resin emulsion (A), Preferably it is 5-30 mass parts. When the polymerized phosphate (B) is less than 3 parts by mass, the adhesion to the siding board is not sufficient. On the other hand, when it exceeds 50 parts by mass, the water resistance of the obtained coating film is lowered, and the water permeability resistance and frost damage resistance are lowered.

The synthetic resin emulsion (A) of the present invention can be obtained not only by emulsion polymerization but also by other methods. For example, a polymer obtained by solution polymerization or bulk polymerization may be emulsified while adding water by using a surfactant or a hydrophilic group in the polymer to obtain a synthetic resin emulsion.

Moreover, in this invention, it is preferable that the synthetic resin emulsion (A) contains the polymer which consists of an unsaturated carboxylic acid and the unsaturated monomer which has a glycidyl group in all the monomer components.

The unsaturated carboxylic acid used in the present invention is a monovalent or divalent unsaturated carboxylic acid, and examples thereof include acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid. Of these, methacrylic acid and acrylic acid are preferable in terms of adhesion to a siding board and water resistance of the obtained coating film. The usage-amount of unsaturated carboxylic acid is 0.5-10 mass parts in 100 mass parts of monomers which comprise a polymer, Preferably it is 1-5 mass parts. When the amount is less than 0.5 parts by mass, the effect of improving the adhesion to the siding board is small. Moreover, when it exceeds 10 mass parts, the water resistance of the obtained coating film falls, and water permeability resistance and frost damage resistance fall.

Furthermore, examples of the unsaturated monomer having a glycidyl group used in the present invention include glycidyl acrylate, glycidyl methacrylate, and glycidyl allyl ether. Among these, glycidyl methacrylate is preferable in terms of adhesion to a siding board, toughness of the obtained coating film, and polymerization reactivity of the synthetic resin emulsion. The usage-amount of the unsaturated monomer which has a glycidyl group is 0.5-10 mass parts in 100 mass parts of monomers which comprise a polymer, Preferably it is 1-5 mass parts. When the amount is less than 0.5 parts by mass, the effect of improving the adhesion to the siding board is small. Moreover, when it exceeds 10 mass parts, the obtained coating film becomes weak and water-permeability resistance and frost damage resistance fall.

Examples of the unsaturated monomer that can be used in the production of the synthetic resin emulsion (A) of the present invention include (meth) acrylic acid alkyl esters and those having at least one polymerizable (meth) acryloyl group. . Specific examples of the (meth) acrylic acid alkyl ester include (meth) acrylic acid esters having a linear, branched or cyclic alkyl chain having 1 to 18 carbon atoms (methyl (meth) acrylate, ethyl ( (Meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, tert-butyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl ( (Meth) acrylate, isoboronyl (meth) acrylate, etc.). In addition, aromatic vinyl compounds (styrene, α-methylstyrene, p-methylstyrene, ethylvinylbenzene, etc.), heterocyclic vinyl compounds (vinylpyrrolidone, etc.), hydroxyalkyl (meth) acrylates (2-hydroxyethyl (meth)) Acrylate, 2-hydroxypropyl (meth) acrylate, etc.), polyalkylene glycol (meth) acrylate (ethylene glycol (meth) acrylate, butylene glycol (meth) acrylate, etc.), alkylamino (meth) acrylate (N, N-dimethyl) Aminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, etc.), vinyl ester compound (vinyl formate, vinyl acetate, vinyl propionate, vinyl versatate (trade name VeoVa 10, He) xion Specialty Chemicals), monoolefin compounds (ethylene, propylene, butylene, isobutylene, etc.), conjugated diolefin compounds (butadiene, isoprene, chloroprene, etc.), α, β-unsaturated mono- or dicarboxylic acids (acrylic acid, Methacrylic acid, crotonic acid, citraconic acid, itaconic acid, maleic acid, maleic anhydride, fumaric acid, etc.), carboxyl group-containing vinyl compounds (monohydroxyethyl (meth) acrylate phthalate, monohydroxypropyl (meth) acrylate oxalate, etc.) ), Amine imide group-containing vinyl compounds (1,1,1-trimethylamine methacrylamide, etc.), vinyl cyanide compounds (acrylonitrile, methacrylonitrile, etc.), amide groups or substituted amide group-containing α, β-esters. Lenically unsaturated compounds ((meth) acrylamide, N-methylacrylamide, N, N-dimethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, etc.), carbonyl group-containing α, β-ethylenically unsaturated compounds Saturated compounds (acrolein, diacetone acrylamide, vinyl methyl ketone, diacetone acrylate, acetonitrile acrylate, etc.), sulfonic acid group-containing α, β-ethylenically unsaturated compounds (allyl sulfonate, sodium p-styrenesulfonate, etc.), ethylene -Unsaturated group-containing ultraviolet absorbers (such as 2- (2′-hydroxy-5′-methacryloyloxyethylphenyl) -2H-benzotriazole), ethylenically-unsaturated-group-containing light stabilizers (1,2,2) , 6,6-Pentamethyl-4-piperidylmethacrylate Also known polymerizable vinyl compounds such as Of these, styrene, methyl methacrylate, 2-ethylhexyl acrylate, and n-butyl acrylate are preferable in terms of adhesion to a siding board and water resistance and toughness of the obtained coating film.

If necessary, as a crosslinkable monomer (some of which are included in the compounds listed above), an epoxy group-containing α, β-ethylenically unsaturated compound (glycidyl (meth) acrylate, 3,4-epoxy) Cyclohexylmethyl (meth) acrylate, glycidyl vinyl ether, glycidyl (meth) allyl ether, 3,4-epoxycyclohexyl (meth) acrylate, etc.), hydrolyzable alkoxysilyl group-containing α, β-ethylenically unsaturated compound (vinyl triethoxy) Silane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, etc.), polyfunctional vinyl compounds (ethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, allyl (meth) acrylate, Divinylbe Zen, diallyl phthalate, etc.) are introduced to cross-link themselves or in combination with an ethylenically unsaturated compound component having an active hydrogen group, or carbonyl group-containing α, β-ethylenically unsaturated A compound (especially limited to those containing keto groups) and a polyhydrazine compound (especially a compound having two or more hydrazide groups; oxalic acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, polyacrylic acid hydrazide, etc.) It is also possible to crosslink in combination.

The surfactant that can be used in the production of the synthetic resin emulsion (A) of the present invention is not particularly limited with respect to usage methods such as emulsification of unsaturated monomers during emulsion polymerization and post-addition for providing stability. . Specifically, anionic surfactants such as sodium dodecylbenzenesulfonate and sodium dodecylsulfate, nonionic surfactants such as polyoxyethylene lauryl ether and polyoxyethylene nonylphenyl ether, cesyltrimethylammonium bromide, laurylpyridinium chloride, etc. Cationic surfactants, amphoteric surfactants such as laurylbedine, other reactive surfactants, and the like. These may be used alone or in combination.

The polymerization initiator used in emulsion polymerization includes persulfate initiators such as potassium persulfate and ammonium persulfate, and water-soluble azo such as 2,2′-azobis (2-methylpropionamidine) dihydrochloride. Examples thereof include system initiators, organic peroxides such as t-butyl hydroperoxide and cumene hydroperoxide, and hydrogen peroxide. These polymerization initiators may be used alone or in combination.

And according to the case, in emulsion polymerization, a reducing agent can be used with these polymerization initiators. Such reducing agents include reducing organic compounds such as ascorbic acid, tartaric acid, citric acid, glucose, formaldehyde sulfoxylate metal salts, reducing properties such as sodium thiosulfate, sodium sulfite, sodium bisulfite, sodium metabisulfite An inorganic compound etc. are mentioned.

Furthermore, in emulsion polymerization, a chain transfer agent can be used as necessary, but the amount used should be examined so as not to cause problems in physical properties such as weather resistance, and within the range controlled according to the application specifications. Can be used. Examples of such chain transfer agents include n-dodecyl mercaptan, tert-dodecyl mercaptan, n-butyl mercaptan, 2-ethylhexyl thioglycolate, 2-mercaptoethanol, β-mercaptopropionic acid and the like.

The emulsion polymerization is usually performed under a temperature condition of about 5 to about 100 ° C, preferably about 50 to 90 ° C.

The polymer obtained by emulsion polymerization increases the surface charge of the emulsion and imparts stability by adding one or more acids or bases, or by adjusting the pH of the system to 4-10. I can do it. Common acids used include acetic acid, lactic acid, hydrochloric acid, phosphoric acid, sulfuric acid and the like. Examples of the general base used include amine compounds such as triethylamine, ammonia, diethanolamine and diethylaminoethanol, and alkali metal hydroxides such as potassium hydroxide, sodium hydroxide and lithium hydroxide.

As minimum film-forming temperature (MFT) of a synthetic resin emulsion composition, 0-70 degreeC is preferable and 20-50 degreeC is more preferable. When the temperature is lower than 0 ° C, the toughness of the obtained coating film tends to decrease and various physical properties tend to decrease. When the temperature is higher than 70 ° C, the film-forming property decreases and the water resistance and frost damage resistance decrease. There is a tendency.

In addition, a thickener, an antifoaming agent, a pigment, a dispersant, a light stabilizer, an ultraviolet absorber, an antiseptic, a film forming aid, and the like are added to the synthetic resin emulsion composition of the present invention as necessary. I can do things. As a method for forming a paint by adding a pigment, a known method is used.

The uses of the synthetic resin emulsion composition of the present invention and the coating composition using the same are not particularly limited, and can be used for general exterior materials. For example, it can be suitably used for ceramic cement exterior materials such as ceramic siding boards and new roof tiles, mortar exterior wall materials, concrete exterior wall materials, metal exterior materials, and wood exterior materials. In particular, it can be suitably used for ceramic siding boards.

Hereinafter, the present invention will be described in detail by way of examples. “Parts” in Examples and Comparative Examples indicates parts by mass. The physical properties in Examples and Comparative Examples were evaluated using the methods shown below.

(1) Nonvolatile content of emulsion; dried at 105 ° C. for 1 hour, and volatile residue was measured.
Viscosity: The viscosity at 23 ° C. was measured using a B-type viscometer.
pH; measured using a pH meter.
Minimum film-forming temperature (MFT): measured with a thermal gradient type minimum film-forming temperature measuring device.

(2) Preparation of paint Mill base preparation: 71.9 parts of deionized water, 0.7 part of Natrosol 250HR (made by Hercules) as a thickener, 0.3 part of aqueous ammonia as a neutralizer, Amorden FS as a preservative -14D (manufactured by Daiwa Chemical Industry Co., Ltd.) 0.7 part, Nopco wet 50 (manufactured by San Nopco Co., Ltd.) 0.1 part as a dispersant, 0.1 part of SN deformer 369 (manufactured by San Nopco Co., Ltd.) as an antifoaming agent, While stirring 58.4 parts of R-630 (manufactured by Ishihara Sangyo Co., Ltd.) as titanium oxide and 47.8 parts of NC clay (manufactured by Maruo Calcium Co., Ltd.) as clay in a container using a homodisper at about 2000 rpm, the above order is applied. The mixture was further stirred at about 2000 rpm for 1 hour. Thereafter, the mixture was filtered through a 120-mesh Teflon (registered trademark) mesh to obtain a mill base having a total of 180 parts and a solid content concentration of 59% (calculated as titanium oxide and clay as the solid content).

Letdown: For each of Examples 1 to 7 and Comparative Examples 1 to 4 obtained by the production examples described later, in a separate container, 180 parts of the mill base, 174 parts of deionized water, 563 parts of a synthetic resin emulsion (non-volatile content 44) %, The addition amount was set so that the same amount of resin was contained according to each nonvolatile content), and benzyl alcohol (addition amount was adjusted by MFT of the synthetic resin emulsion) as a film-forming auxiliary was 39. The mixture was charged and stirred at about 2000 rpm for 10 minutes using a homodisper. Thereafter, the mixture was filtered through a 150-mesh Teflon (registered trademark) mesh to obtain a total of 956 parts, a solid content concentration of 37.0%, and a weight pigment concentration of 30%.

(3) Preparation of coated plate The above-mentioned coating material was applied to the surface of a ceramic siding board (wood chip-containing cement plate) at 6 g / scale with a brush and dried at 100 ° C. for 10 minutes. Further, a coating material obtained by adding a pigment and an additive to a styrene / acrylic acid ester copolymer resin emulsion as a top coating material was applied to the surface at a spray angle of 6 g / angle, and dried at 100 ° C. for 10 minutes, and 23 ° C. Cured for 1 day at 65% RH. The top coating material had a weight pigment concentration of 60%, and the pigment was used in a mass ratio of titanium oxide / clay = 50/50. Moreover, the styrene / acrylic acid ester copolymer resin emulsion that is a binder of the top coating material was styrene / methyl methacrylate / 2-ethylhexyl acrylate = 50/25/25 by mass ratio.

(4) Evaluation of adhesion The obtained coating film on the coated plate was cut into a 2 mm square grid with a cutter knife, and the coating film was forcibly peeled off with cellophane tape and remained on the substrate. The state of the coating film was visually evaluated according to the following criteria.
A: Less than 5% peeling ○: 5% to 10% peeling
Δ: peeling 10-50%
X: peeling 50% or more

(5) Evaluation of water permeability A water permeable cup (75 mm in diameter) was attached to the coating film on the obtained coated plate with a silicone sealing agent, and after drying, water was added to a height of 25 cm of the water permeable cup, and the weight was reduced after 24 hours. The amount of water was measured and evaluated according to the following criteria.
A: Less than 0.5 ml peeling ○: Water reduction amount 0.5-1 ml
Δ: Reduced water volume 1-5 ml
×: Water reduction amount of 5 ml or more

(6) Evaluation of frost damage (freeze-thaw cycle test)
With respect to the obtained coated plate, (freeze in air at −20 ° C. × 2 hours) + (thawing in water at 20 ° C. × 1 hour) was defined as one cycle, and 200 freeze-thaw cycles were repeated. The coating film on the coated plate after 200 freeze-thaw cycles was cut into a 2 mm square grid with a cutter knife, and the coating film was forcibly peeled off with cellophane tape, leaving the coating on the substrate. The state of the film was visually evaluated according to the following criteria.
A: Less than 5% peeling ○: 5% to 10% peeling
Δ: peeling 10-50%
X: peeling 50% or more

(7) Standing stability of paint The paint was put into a 70 ml mayonnaise bottle, and the viscosity after standing for 7 days at 60 ° C. was measured and evaluated according to the following criteria.
○: Less than 20% viscosity change ×: More than 20% viscosity change

Example of production of synthetic resin emulsion (Example 1)
In a polymerization apparatus equipped with a stirrer, a thermometer, and a reflux condenser, 200 parts of deionized water was placed and heated. While maintaining the internal temperature at 75 ° C., 190 parts of deionized water, 9 parts of Adeka Soap SR-10 (anionic reactive surfactant, manufactured by ADEKA), 291 parts of styrene, 139 parts of 2-ethylhexyl acrylate, glycidyl 14% of methacrylate, 8.5 parts of methacrylic acid, and 2.5 parts of n-dodecyl mercaptan were mixed in advance using a homomixer, and 5% of the emulsion was added to the polymerization apparatus. Next, 0.5 parts of potassium persulfate and 5 parts of deionized water were added to initiate polymerization, and the reaction was carried out at 80 ° C. for 15 minutes. Further, the remaining 95% of the previous emulsion and 37 parts of an aqueous potassium persulfate solution in which 1 part of potassium persulfate was dissolved were added dropwise over 3 hours while maintaining the internal temperature at 80 ° C. Furthermore, it reacted at 80 degreeC for 2 hours, and cooled to room temperature (25 degreeC) after that. After adjusting the pH to 7 to 8 with aqueous ammonia, 233 parts of a 20% aqueous solution of sodium tripolyphosphate was added as a polymerized phosphate, and 8 parts of deionized water was added as adjusted water to obtain a synthetic resin emulsion composition. The properties of the resulting synthetic resin emulsion composition were non-volatile content 45.0%, viscosity (BM type viscometer, 60 rpm, 23 ° C.) 30 mPa · s, pH 8.2, MFT 44 ° C. Hereinafter, other examples were prepared according to the procedure of Example 1 with the compositions shown in Table 1.

Table 2 shows a list of various physical property evaluation results of the synthetic resin emulsion compositions obtained in the steps of Examples 1 to 7 and Comparative Examples 1 to 4.

  From the comparison of Examples 1 to 7 and Comparative Examples 1 to 4, when the synthetic resin emulsion composition of the present invention is used for ceramic siding boards, it has excellent adhesion, good water permeability resistance and frost damage resistance. I understand that. It can also be seen that there is no particular problem with the standing stability of the paint.

Claims (2)

(A) A synthetic resin emulsion comprising a polymer obtained by polymerizing an (meth) acrylic acid alkyl ester monomer and / or an unsaturated monomer copolymerizable with a (meth) acrylic acid alkyl ester monomer the resin solid content 100 parts by mass, (B) polymerized phosphate viewed contains 3 to 50 parts by mass, the the monomer in 100 parts by mass of a polymer unsaturated carboxylic acid 0.5-10 parts by weight And a synthetic resin emulsion composition containing 0.5 to 10 parts by mass of an unsaturated monomer having a glycidyl group . A coating composition for a ceramic siding board comprising the synthetic resin emulsion composition according to claim 1 .