JPH07278463A - Water-based primer and method for finishing outer wall of construction - Google Patents

Abstract

PURPOSE:To obtain a primer excellent in the adhesion to a substrate and adaptability to finish coating and capable of shortening the procedure of application by mixing an emulsion of copolymer particles each in the form of a multilayer structure comprising the innermost layer contg. a copolymer having epoxy groups and the outermost layer of a copolymer having carboxyl groups with an inorganic powder at a specific pigment vol. concn. CONSTITUTION:An emulsion of copolymer particles each in the form of a multilayer structure made up either of the following three layers; (A) a layer contg. a copolymer having epoxy groups, (B) a layer of a copolymer unreactive with epoxy and carboxyl groups and (C) a layer of a copolymer having carboxyl and amide groups, or of the following two layers; the layer (A) and the layer (C), provided that the surface of the layer (A) as the central portion of each particle is covered either with the layer (B) having the surface thereof further covered with the layer (C) or directly with the layer (C), is mixed with an inorganic powder at a pigment vol. concn. of 40 to 70% to prepare the objective water-based primer.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a water-based undercoating material composition used for coating finish of an exterior wall of a building and a method for constructing an exterior wall. Particularly, it has excellent adhesion to a groundwork and suitability for topcoating, and can shorten the construction process. Provided are a ground control material composition and an outer wall finishing method.

[0002]

2. Description of the Related Art Conventionally, in a finishing method for an outer wall of a building, it is common to perform a ground adjustment on various ground surfaces. This is because it may not be appropriate to apply the finish coating material as it is when the characteristics of each base are different or the base has defects such as cracks and unevenness. As such a ground control material,
Synthetic resin emulsion sealer, synthetic resin solvent-based sealer, synthetic resin putty, cement-based primer adjustment coating,
Examples include synthetic resin emulsion-based base conditioning coating materials.
First, the synthetic resin emulsion sealer is used for applying to a base to suppress the suction of the finish coating material to the base and to improve the adhesiveness. It is necessary to have excellent alkali resistance and film-forming properties, and mainly acrylic synthetic resin emulsion, vinyl acetate synthetic resin emulsion, epoxy synthetic resin emulsion, and chlorinated rubber synthetic resin emulsion are used. The synthetic resin solvent-based sealer is used for the same purpose as. It is characterized by good alkali resistance and better adhesion to the substrate. A synthetic resin solution of a one-pack type such as an acrylic type, a vinyl chloride type, a chlorinated rubber type or a two-component reaction type such as an epoxy type is mainly used. However, in the case of the two-liquid reaction type, it is necessary to pay attention to the step interval time. Synthetic resin putty is divided into synthetic resin emulsion putty and synthetic resin solvent putty. The synthetic resin emulsion putty is a putty made by adding a pigment, an inorganic filler and a thickening agent to an acrylic or vinyl acetate synthetic resin emulsion, and it is preferable that the putty has little cracking or meat thinness when dried. This is not used for outdoor surface conditioning because it repeatedly swells and the adhesion decreases when it is affected by water. The synthetic resin solvent-based putty is used for adjusting the base of the synthetic resin solvent-based finishing coating material. Cement-based ground control coating materials are prepared in the form of cement paste containing polymer dispersion for cement admixture at the factory, or powder consisting of cement, fine aggregate and inorganic admixture and polymer dispersion for cement admixture. There is a type to mix in. It is generally used for adjusting small holes of 3 mm or less and unevenness. The synthetic resin emulsion-based undercoating coating material is an undercoating coating material called an organic filler in contrast to the cement-based undercoating coating material. This is due to the workability of cement-based ground control coatings (long curing time due to the hydraulic reaction of cement), workability, and performance stability (for example, material storage, performance variations at low and high temperatures, Eflo generation at low temperature, pot life, etc.) has been mainly developed and improved. Although these have the respective advantages as described above, is not suitable for the base adjustment, and has a weak function as a sealer. Therefore, it is the actual situation that the base adjusting materials from these are used in combination depending on the condition of the base. On the other hand, some of them have a function as a sealer and a filling and repairing of unevenness of the substrate, pinholes, cracks, etc., so that the substrate can be adjusted independently. Since this is mainly composed of a synthetic resin emulsion, it does not volatilize an organic solvent and is compatible with the recent trend of environmental protection, so it is a very ideal base adjustment coating material.
In addition, the coating base of the outer wall of the building usually expands and contracts due to warming and cooling, and cracks may occur over a long period of time, so that even if there is such movement of the base, the initial effect can be maintained continuously. It is characterized by using a thermoplastic synthetic resin emulsion in order to impart elasticity capable of following the substrate. Therefore, even if a synthetic resin emulsion-based base adjustment coating can be used alone to repair the sealer and the base, it is exposed to high temperatures or a single layer elastic coating or a relatively thick coating as the finish coating. When the material to be applied is applied, the finish coating material may peel off from the undercoating adjustment material due to internal stress and cause swelling. These finishing coating materials were applied after improving the adhesion. In this way, even in a synthetic resin emulsion-based base adjustment coating material that can be used as both a sealer and a base repair independently, it may cause problems depending on the type of the finish coating material, and the application range of the finish coating material is limited. It was something that was Further, since the thermoplastic synthetic resin emulsion is used, there is a portion having poor water softening resistance, and consequently it cannot be used alone as a base adjusting coating material. On the other hand, by using a cross-linking type emulsion as a synthetic resin emulsion of a synthetic resin emulsion-based undercoating coating material, there has been developed a solution to the problems of swelling of the finish coating material and water softening resistance as described above. . For example, on pages 1 to 4 of the "1993 Conference Academic Lecture Research Papers" published by the Japan Society for Finishings Technology, entitled "Development of Aqueous Reaction-Cured Emulsion Resin-based Filler" as the title number 401, the crosslinked type Synthetic resin emulsion-based base conditioning coating materials (organic fillers) using emulsions are introduced. And used as the cross-linked emulsion,
The following is described for the aqueous reaction-curable emulsion. "3. Development of aqueous reaction-curing emulsion resin For the purpose of imparting toughness and microelasticity to the coating film formed,
We developed an aqueous reaction-curing emulsion resin (acrylic emulsion resin with interparticle cross-linking ability of emulsion) as a binder. The aqueous reaction-curable emulsion resin is stably present in the paint in a state where emulsion particles and a crosslinking agent are mixed. After coating, the fusion between emulsion particles and the crosslinking reaction proceed simultaneously in the evaporation process of water to form a tough coating film. The interparticle cross-linking reaction of the emulsion occurs by the dehydration condensation reaction of the carbonyl group which is a reactive group oriented on the surface of the emulsion particles and the hydrazide group of the cross-linking agent. Therefore, when the water vaporization progresses to the point when the crosslinking reaction starts, the subsequent reaction proceeds acceleratingly, and as a result,
It is characterized by a shorter drying time. The balance between the toughness and elasticity of the coating film formed was adjusted by controlling the Tg (glass transition temperature) and crosslink density of the resin. In addition, the adhesion to the substrate was significantly improved by the introduction of a monomer having a functional group that contributes to the adhesion during the synthesis of the emulsion and the synergistic effect with the toughness of the coating film due to crosslinking. When such a crosslinked emulsion is used, it is essential to control the glass transition temperature (hereinafter abbreviated as Tg) of the resin and the crosslink density.

[0003]

However, in the synthetic resin emulsion-based undercoating coating material using these crosslinked emulsions, some functional groups of the crosslinked emulsion react during long-term storage. Further, since such a synthetic resin emulsion-based undercoating coating material is manufactured by stirring and mixing the inorganic powder and the emulsion at the time of its production, the emulsion particles are given shear stress by the powder, and the emulsion particles are destroyed. Occurs partly. In such a case, in order to control the toughness of the coating film, the initially set crosslinking density of the resin may fluctuate, and the desired coating film toughness and elasticity may not be obtained. It was Further, the synthetic resin emulsion-based undercoating coating material using these crosslinked emulsions, the crosslink density cannot be increased so much for the purpose of imparting elasticity,
As a result, the degree of solvent resistance is not so high, and it has been difficult to use a solvent-based finishing coating material. Further, even in the case of a water-based finishing coating material, there is variation in the degree of its adhesiveness, and the adhesiveness is still insufficient unless a cross-linking emulsion of the same type as the synthetic resin emulsion base adjusting coating material is used. there were. Furthermore, if the building exterior wall coating base is a newly constructed concrete, the peeling resistance of the synthetic resin emulsion base adjustment coating itself is poor unless the sealer process is performed, that is, part of it is peeled off in the elastic coating. Then, it was found that the peeled portion was continuously expanded. Therefore, the problem to be solved by the present invention is that it can be applied independently (without a sealer step) to a base material regardless of new construction or renovation, and it has excellent adhesion, especially peeling resistance, and conventional crosslinking. The purpose of the present invention is to obtain a water-based undercoating material having a wider range of compatibility with a finishing coating material than a synthetic resin emulsion-based undercoating material using a shaped emulsion.

[0004]

On the other hand, the present inventors have used a specific emulsion having a multi-layer structure as a cross-linking type emulsion, and determine the monomer composition of the resin in the core portion and the shell portion and the Tg of the resin. It has been found that a completely new synthetic resin emulsion-based undercoating material that solves the above-mentioned problems, that is, an aqueous undercoating material, can be produced by incorporating a specific inorganic powder into this emulsion. That is, the present invention provides an aqueous base conditioner having the following constitution. 1. (A) a layer containing a copolymer having an epoxy group, (B) a layer made of a copolymer inert to an epoxy group and a carboxyl group, and (C) a copolymer having a carboxyl group and an amide group It is composed of three layers of a coalesced layer or two layers of (A) layer and (C) layer, with the (A) layer as the central part, the surface of which is the (B) layer, and the surface of which is the (C) layer or , The multilayer structure type emulsion in which the (C) layer is laminated on the surface of the (A) layer and the inorganic powder are mixed so that the pigment volume concentration (hereinafter abbreviated as PVC) is 40 to 70%. A water-based base conditioning material. 2. (A) The polymerizable monomer used to generate the epoxy group is glycidyl methacrylate, and (b) the polymerizable monomer used to generate the carboxyl group is (meth) acrylic acid, itaconic acid, maleic acid, or fumaric acid. One or more ethylenically unsaturated carboxylic acids selected, the polymerizable monomer used to form the (c) amide group is (meth) acrylic amide,
The contents of (a), (b), and (c) are each (a):
(B): (c) = 0.5 to 7.5 wt%: 0.5 to 7.
5% by weight: 0.5 to 5% by weight, The aqueous base conditioner as described in 1 above. 3. The glass transition temperature (hereinafter abbreviated as Tg) of the innermost layer of the multilayer structure emulsion is equal to or lower than that of the outermost layer,
Tg of the formed film is -30-5 degreeC, The aqueous | water-based base conditioner of the said 1 or 2 characterized by the above-mentioned. 4. A method for finishing an outer wall of a building, which comprises applying any one of the above 1 to 3 on an outer wall of a building to adjust a groundwork, and further applying a laminated coating of a silicone-based aqueous resin-dispersed enamel. 5. A method for finishing an outer wall of a building, which comprises applying any one of the above items 1 to 3 on an outer wall of a building to adjust a groundwork, and further applying a single layer elastic finish coating material in layers. The multi-layer structure emulsion used in the present invention is an emulsion formed of two layers or three layers, and has an epoxy functional group in the innermost layer portion and a carboxyl functional group in the outermost portion. These functional groups usually do not react at all, with the evaporation of water as a dispersion medium in the emulsion, the distance between the emulsion particles are closer, further emulsion particles contact each other, the crosslinking reaction when it comes to fuse It occurs and rapidly forms a water-insoluble synthetic resin coating film. As such an emulsion, one produced by a conventionally known method may be used. As an example, a production method and a specific configuration thereof will be described.
The emulsion composition described in 76004 is mentioned. When quoted below, "the monomers used for producing the various copolymers contained in the dispersed particles of the emulsion composition are roughly classified into the following three types. First, examples of the “monomer having an epoxy group” for producing a copolymer having an epoxy group include epoxy derivatives such as diglycidyl acrylate, glycidyl methacrylate, and allyl glycidyl ether. You may use these individually or in mixture of 2 or more types. Then, as the "monomer having a functional group capable of reacting with an epoxy group" for producing a copolymer having a functional group capable of reacting with an epoxy group, acrylic acid containing a carboxyl group,
Ethylenically unsaturated carboxylic acids such as methacrylic acid, crotonic acid, maleic acid or its monoalkyl ester, itaconic acid or its monoalkyl ester, fumaric acid or its monoalkyl ester; N-containing amino groups
Alkyl aminoesters of alkyl of acrylic acid or methacrylic acid such as methylaminoethyl acrylate, N-methylaminoethyl methacrylate, dimethylaminoethyl acrylate and dimethylaminoethyl methacrylate; monovinylpyridines such as vinylpyridine; dimethylaminoethyl vinyl ether etc. Vinyl ethers having an alkylamino group; unsaturated amides having an alkylamino group such as N- (2-dimethylaminoethyl) acrylamide and N- (2-dimethylaminoethyl) methacrylamide. You may use these individually or in mixture of 2 or more types. Further, "other monomers", that is, "a copolymer which is inactive to both an epoxy group and a functional group capable of reacting with an epoxy group", "a copolymer having an epoxy group" and "a copolymer capable of reacting with an epoxy group". Monomers used to form the "functionalized copolymer" include methyl-, ethyl-, isopropyl-, n-butyl-, isobutyl-, n-
-Amyl-, isoamyl-, n-hexyl-, 2-ethylhexyl, octyl-, decyl-, dodecyl-, octadecyl-, cyclohexyl-, phenyl-, benzyl-, 2-hydroxyethyl-, hydroxypropyl-acrylate or Acrylic esters or methacrylic esters such as methacrylate; vinyl esters such as vinyl acetate and vinyl propionate; acrylonitrile, methacrylonitrile, etc .; styrene, 2-methylstyrene, vinyltoluene, t-butylstyrene, chlorostyrene, vinylanisole , Vinyl naphthalene, divinylbenzene and other aromatic vinyls; acrylamide; methacrylamide, maleic amide, N-methylol acrylamide, N-methylol methacrylamide, diacetone acrylate Vinylidene chloride; amides etc.
Vinylidene halides such as vinylidene fluoride; ethylene, propylene, isoprene, butadiene, vinylpyrrolidone, vinyl chloride, vinyl ether, vinyl ketone,
Examples include vinylamide and chloroprene. You may use these individually or in mixture of 2 or more types. Therefore,
The dispersed particles contained in the composition of the present invention are used as a raw material monomer of “monomer having epoxy group” and “other monomer” to form “copolymer having epoxy group”, and two or more kinds of “other Is used as a raw material to form an “inactive copolymer in both the epoxy group and the functional group capable of reacting with the epoxy group”, and further, the “monomer having a functional group capable of reacting with the epoxy group” The "other monomer" is used as a raw material monomer to generate a "copolymer having a functional group capable of reacting with an epoxy group", and layers each containing these copolymers are laminated to manufacture. It may be produced by emulsion polymerization according to a procedure such as ". However, as in the method quoted here, a layer composed of "an epoxy group and a copolymer inert to both the epoxy group and the functional group capable of reacting with the epoxy group" is not always necessary, and the "copolymer having an epoxy group" is not necessarily required. It may have a two-layer structure composed of the innermost layer of the "composite" and the outermost layer of the "copolymer having a functional group capable of reacting with an epoxy group". The respective contents of the epoxy group and the carboxyl group in the innermost layer and the outermost layer vary depending on the Tg of the copolymer in each layer, but the content of the polymerizable monomer copolymerized to introduce the epoxy group and the carboxyl group is In terms of content, each is 0.5 to 7.5 wt% of all the monomers constituting the multilayer emulsion. As the monomer used for introducing the epoxy group, those described in the above cited references can be used. However, allyl glycidyl ether tends to be inferior in copolymerizability with other acrylic monomers, and glycidyl acrylate has high hydrophilicity, and therefore when a multi-layered emulsion is formed by polymerization, an epoxy group is localized in the innermost layer. It is difficult to localize it, and particularly in the case of an emulsion having a two-layer structure, it may react with the carboxyl group of the outermost layer. Therefore, glycidyl methacrylate, which does not have such a problem, is most preferable. Similarly, the monomer used for introducing the carboxyl group may be the one described in the above-mentioned reference, but (meth) acrylic acid is used because the stability of the crosslinking reaction of the multilayer structure emulsion is good. It is preferable to use ethylenically unsaturated carboxylic acids such as itaconic acid, maleic acid and fumaric acid.
Especially in the case of a two-layer structure emulsion, by using a highly hydrophilic emulsion, the carboxyl group is localized outside the outermost layer and does not react with the epoxy group in the innermost layer before the crosslinking reaction, so that it is stable in storage. It improves the sex. For this reason, acrylic acid is more preferably used. The innermost layer of the copolymer of each layer is preferably equal to or less than the outermost layer. In the case of such a Tg range, the emulsion particles are less likely to be crushed even when shear stress occurs due to mixing and stirring with the inorganic powder during the production of the aqueous base conditioner of the present invention. In addition, the water-based undercoating material of the present invention has a Tg of a film formed from an emulsion of − because of the followability to the coating undercoating.
It is preferably 30 to 5 ° C. The average particle size of the multi-layered emulsion affects the resin solid content of the emulsion and thus the pigment volume concentration of the produced aqueous base conditioner,
As a guideline, those of about 0.05 to 0.2 μ can be used. As the inorganic powder, heavy calcium carbonate, precipitated calcium carbonate, kaolin, bentonite, sericite, dolomite, talc, clay, aluminum oxide, magnesium oxide, diatomaceous earth, etc. can be used, but especially in the outermost layer of the multilayer emulsion. Carry out a metal cross-linking reaction with a certain carboxyl group, an inorganic powder that produces divalent or higher valent metal ions, for example, aluminum hydroxide, gypsum, Portland cement, when used in combination with alumina cement to the extent that does not impair the stability of the coating, The metal cross-linking further improves the physical properties of the aqueous microelastic filler. When such a combination is used, it is necessary to make the content of the carboxyl groups in the outermost layer of the multilayer structure emulsion larger than the content of the epoxy groups in the innermost layer. The average particle size of the inorganic powder is about 0.1 to 40 μm, but 0.25 to
10μ is more preferable. By combining such an inorganic powder and the above-mentioned multilayer structure emulsion, excellent adhesion to a coating base as a synthetic resin emulsion-based base adjusting material, realization of followability and slight elasticity capable of hard topcoating,
Adhesion with the topcoat is obtained. The coating material that can be used as the top coat is an elastic or hard coating material from water-based to weak solvent-based. In particular, when a single-layer elastic coating material or a silicone-based water-based resin-dispersed enamel is used, an excellent function can be given to the outer wall of the building together with the function of the top coating. The mixing ratio of the constituents of the present invention is such that the produced microelastic filler has a pigment volume concentration (hereinafter abbreviated as PVC) of 4.
The multi-layered emulsion and the inorganic powder may be appropriately mixed so as to be 0 to 70%. When the PVC is lower than 40%, the peeling resistance is poor, and when the PVC is higher than 70%, the hair crack followability is poor. In the present invention, a dispersant, a film-forming aid, a thickener, an antifoaming agent and the like can be added in order to further improve the physical properties. As the dispersant, polycarboxylic acid-based ones, sodium hexametaphosphate, β-naphthalenesulfonic acid, sodium salt of formalin condensate, and the like, and as the film-forming auxiliary, texanol, ethylene glycol monobutyl ether, ethylene glycol monobutyl ether. Acetate, diethylene glycol butyl ether, propylene glycol butyl ether, dipropylene glycol butyl ether, hexylene glycol, benzyl alcohol, etc., thickeners include silicates, montmorillonite, organic montmorillonite, inorganic substances such as colloidal alumina, carboxymethyl cellulose Fibrin derivatives such as methyl cellulose, hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, sodium polyacrylate, polyacetic acid Polyacrylic acid type such as acid (meth) acrylic acid ester copolymer, Pluronic polyether, polyether dialkyl ester, polyether dialkyl ether, polyether urethane modified product, polyether epoxy modified product, etc. Examples of the defoaming agent include silicone-based, silica-based, and mineral oil-based defoaming agents. These compounding ratios are such that the dispersant is 0 to 10 parts by weight with respect to 100 parts by weight of the solid content of the multilayer structure emulsion,
0 to 40 parts by weight of the film forming aid, 0 to 50 parts by weight of the thickening agent,
The antifoaming agent is in the range of 0 to 10 parts by weight. Inorganic compounds such as titanium dioxide, zinc oxide, carbon black, red iron oxide, yellow iron oxide, titanium yellow, chrome green, cobalt green, ultramarine blue, cobalt blue, etc., and β-naphthol, naphthol as long as they do not exceed the specified range of PVC. Insoluble azo pigments such as AS, pyrazolone, benzimidazolone, etc., soluble azo pigments, anthraquinone, thioindigo, perylene, quinacridone, monoazo, condensed azo, phthalocyanine, isoindolinone, quinophthalone, etc. It is also possible to blend the organic coloring pigments. The water-based undercoating material of the present invention is applied by a spray gun such as a tile gun or a resin gun, a spraying device such as an airless gun, a mastic roller, a roller such as a wool roller, a trowel coating, and a brush coating.

[0005]

【Example】

(Reference Example 1) Emulsion polymerization of a multilayer emulsion was carried out with the monomer composition ratios of the innermost layer and the outermost layer as shown in Tables 1 and 2. The procedure of emulsion polymerization is shown below. First, 350 g of deionized water and 1 g of sodium alkylbenzene sulfonate were charged into a reaction vessel, the temperature was raised to 70 ° C. while stirring and nitrogen substitution, and 2 g of ammonium persulfate was added. To this, 116.65 g of styrene, n
-Butyl acrylate (272.15 g) and glycidyl methacrylate (2.5 g) were added to a solution obtained by dissolving 0.6 g of sodium alkylbenzenesulfonate in 100 g of deionized water, and the emulsified and dispersed emulsified monomer was continuously added dropwise over 3 hours. After completion of dropping, aging was carried out for 2 hours. Next, 29.15 g of styrene and 68. of n-butyl acrylate.
05 g, methacrylic acid 1.5 g, acrylic amide 10
g, t-dodecyl mercaptan 0.4 g, deionized water 50 g, sodium alkylbenzenesulfonate 0.4
g was added to the dissolved product, and the emulsified and dispersed emulsified monomer was continuously added dropwise over 2 hours. After completion of dropping, aging was carried out for 2 hours. Ammonia water was added to the obtained emulsion to adjust the pH to 7.5, and then the mixture was filtered through a 200-mesh wire net to obtain a milky white emulsion.

[Table 1]

[Table 2] Reference Examples 2 to 17 Emulsion polymerization of a multilayer emulsion was carried out in the same manner as in Reference Example 1 using the monomer composition ratios of the innermost layer and outermost layer shown in Tables 1 and 2, and Reference Example 15 was acrylic amide. Since the amount was too large, the viscosity was increased during the polymerization, but other than that, stable polymerization could be performed and a milky white emulsion could be produced. * Preliminary test * Using the emulsions of Reference Examples 1 to 17 except Reference Example 15, synthetic resin emulsion-based undercoating conditioners were produced according to the following formulation and designated as Formulation Example 1 to Formulation Example 17, respectively. The PVC of the synthetic resin emulsion-based undercoating material produced at this time was 60%. Emulsion 30.00 Titanium dioxide 5.00 Heavy calcium carbonate 57.54 Dispersant 0.50 Film forming aid 3.00 Thickener 3.76 Defoamer 0.20 (parts by weight) ────── ───────────────── 100.00 (Paint Stability Test) For each of the synthetic resin emulsion-based base conditioning materials thus produced, a paint stability test was conducted at 50 ° C. The change in viscosity when left in the atmosphere for 1 week was evaluated by the change in appearance, and those in which gelation or aggregation of emulsion occurred were rated as x, and those in which there was no particular change were rated as o. As shown in Tables 3 and 4, in Reference Example 11, the reaction groups of the reactive groups were not separated, and the reaction between the epoxy groups and the carboxyl groups proceeded to cause the emulsion to aggregate. In Example 14, it was found that the emulsion aggregated due to the fact that the protection effect of the emulsion by acrylic amide was not obtained. It was also found that the other coatings exhibited good paint stability. (Topcoat compatibility) Further, as a topcoat compatibility test, an adhesion test with various topcoat coating materials was performed. First, the produced synthetic resin emulsion-based undercoating material was applied on a slate plate having a size of 15 × 7 cm at an application amount of 1.5 kg / m ² , and after curing for 24 hours, the topcoat material 1 and the topcoat material 2. The top coating material 3 was applied in the coating amount shown below, respectively, and dried for 2 weeks.
8.19 In accordance with the water resistance test of the paint general test method, put deionized water in a container to a depth of about 150 mm, hang the prepared test body with clips and strings, soak it to a depth of about 120 mm, and test the test body one week later. Was taken out, the water was removed, and the coating film was immediately visually observed to evaluate the result. At this time, one with a noticeable swelling, one with no change at all
Others were evaluated on a scale of 5 according to the range of swelling. The results are shown in Tables 3 and 4. As can be seen from the results, Formulation Example 12, which does not contain glycidylmethacrylate and uses the emulsion of Reference Example 12, is very small in the silicone-based aqueous resin-dispersed enamel because peeling occurred in the single-layer elastic coating material. Topcoat compatibility is insufficient because some blisters have occurred. Further, the synthetic resin emulsion-based base conditioning material of Formulation Example 13 produced from Reference Example 13 in which the emulsion was used in a larger amount than the content of glycidyl methacrylate specified when the emulsion was produced by the type of monomer preferably used in the present invention, The suitability for topcoating is insufficient because peeling occurs in the single-layer elastic coating material and because only a part of the silicone-based aqueous resin dispersion type enamel swells. Furthermore, Formulation Example 16 using the emulsion of Reference Example 16 having a Tg lower than the range specified in the present invention was also used in the silicone-based water-based resin-dispersed enamel because of the reason that peeling occurred in the single-layer elastic coating material. Topcoat compatibility is insufficient due to blistering. Other than these, it was found that the various topcoats also exhibited excellent adhesion and were excellent in topcoat compatibility. Topcoat coating material 1 is "elastic topless style" manufactured by SK Kaken Co., Ltd. (single-layer elastic coating material, coating amount 1k
g / m ² ), the top coating material 2 is “SK Mild Urethane” manufactured by SK Kaken Co., Ltd. (weak solvent coating material, coating amount 0.
3 kg / m ² ), and as the top coating material 3, a silicon-based aqueous resin dispersion type enamel manufactured by the following manufacturing procedure was used. (Coating amount 0.3 kg / m ² ). Topcoat material 3 65 parts by weight of cyclohexyl methacrylate, 10 parts by weight of γ-methacryloxypropyltrimethoxysilane, 2-
23 parts by weight of ethylhexyl acrylate, acrylic acid 2
Parts by weight, Eleminor JS-2 [manufactured by Sanyo Kasei Co.,
Reactive emulsifier] 10 parts by weight, t-butylperoxy (2
-Ethyl hexanoate), 54 parts by weight of water, and 6 parts by weight of methanol were stirred and emulsified, and then ultrasonic waves were used to prepare a dispersion containing a monomer having a particle size of 0.5 μm. . Next, 63 parts by weight of water and 7 parts of methanol were charged into a reaction vessel equipped with a stirrer, a reflux condenser, a dropping funnel, a nitrogen inlet, and a thermometer, and the temperature was raised to 80 ° C. with stirring. The dispersion containing the monomer was added dropwise to the above reaction vessel for 4 hours to carry out the reaction. 80 while introducing nitrogen while dropping
The reaction was carried out at 0 ° C., and a 25% ethylamine aqueous solution was added at appropriate times to maintain the pH at 6-8. After completion of the dropping, aging was carried out for 2 hours and cooled to room temperature to obtain an aqueous resin dispersion liquid. To 60 parts by weight of this aqueous resin dispersion, 22 parts by weight of rutile type titanium dioxide, 2.5 parts by weight of dispersant, 6 parts by weight of film-forming aid, 1 part by weight of thickener, 0.2 parts of defoaming agent. Part by weight was mixed to produce a white silicone-based aqueous resin dispersion type enamel.

[Table 3]

[Table 4] (Example 1) In 30.00 parts by weight of the emulsion of Formulation Example 3, 5.00 parts by weight of titanium dioxide, 23.79 parts by weight of ground calcium carbonate, and 0 of a polycarboxylic acid type dispersant as a dispersant. .50 parts by weight, 3.00 parts by weight of benzyl alcohol as a film-forming aid, 3.76 parts by weight of a 2% solution of carboxymethyl cellulose as a thickening agent, and 0.20 parts by weight of a silicon-based defoaming agent as a defoaming agent. Partly mixed PV
A C40% synthetic resin emulsion base conditioning material was manufactured. The following physical property tests were carried out on this synthetic resin emulsion base preparation. As a result, as shown in Table 5, peeling resistance, crack resistance, zero span elongation,
It was found to be an excellent water-based undercoating conditioner with excellent performance in hair crack followability. * Physical property test of synthetic resin emulsion-based undercoating material * (Peeling resistance) The coating amount of the prepared synthetic resin emulsion-based undercoating material was applied to a 15 x 7 cm slate plate.
It was applied at 5 kg / m ² and after curing for 2 weeks, a peeling test was conducted in which the end portion was peeled off with a nail. At this time, the case of no peeling was set to 5, and the case of complete peeling was set to 1, and a 5-grade evaluation was performed. (Crack resistance) JIS A 6915 Thick finish coating 5.
7 According to the crack resistance test by initial drying, 15
The prepared synthetic resin emulsion base conditioning agent was applied to the surface of a slate plate of × 30 at a coating amount of 1.5 kg / m ² and immediately put into a wind tunnel with a wind speed of 3 m / s ± 10% to perform a test. Place your body parallel to the airflow. After 6 hours, the test piece was taken out and visually inspected whether or not cracks occurred on the surface of the synthetic resin emulsion-based undercoating material. When there was no crack, it was evaluated as ○, and when there was crack on the entire surface, it was evaluated as ×. I went. (Zero span elongation and hair crack followability) 50 ×
50 x 50 x 5 mm on 100 mm thick adhesive tape
The two slate plates of No. 1 were attached to each other without causing a butt gap, and the manufactured synthetic resin emulsion-based base conditioning material was applied at a coating amount of 1.5 kg / m ^{2 to a} uniform thickness.
After curing for 4 days at a temperature of 20 ° C and a humidity of 60%, remove the adhesive tape, fix both ends in the longitudinal direction, and
The tensile distance when the synthetic resin emulsion-based undercoating material was ruptured by pulling at a speed of mm was used as the measured value. When the measured value was 0.5 mm or more, it was possible to follow the hair crack of the skeleton, and when it was less than 0.5 mm, it was not possible to follow, and was evaluated as x.

[Table 5] (Examples 2 to 6) The kinds of the dispersant, the film-forming aid, the thickener, and the defoaming agent were the same as in Example 1 except that the mixing ratios shown in Table 5 were used. A base conditioner was manufactured. The same tests as in Example 1 were performed on these synthetic resin emulsion-based base conditioning materials. The results are as shown in Table 5, peeling resistance, crack resistance,
It was found that it was an excellent water-based undercoating conditioner with excellent performance in both zero span elongation and hair crack followability. (Comparative Example 1) As shown in Table 5, Example 5 was repeated except that the emulsion of Formulation Example 16 was used as the multilayer structure emulsion.
A synthetic resin emulsion-based undercoating material was manufactured in the same manner as above, and the same test was conducted. As a result, as shown in Table 5, it was found that the film Tg of the multi-layered emulsion was higher than the range specified in the present invention, so that the value of zero span elongation was small and it was not possible to follow the hair crack of the skeleton. (Comparative Example 2) A synthetic resin emulsion-based base conditioning material was produced at the compounding ratios shown in Table 5, and the same test as in Examples was conducted. As shown in Table 5, since PVC is lower than the specified range of the present invention, the peeling resistance is poor, and when it is used alone in a new concrete building or the like, swelling and peeling may occur over time. (Comparative Example 3) Synthetic resin emulsion-based base conditioning materials were produced in the compounding ratios shown in Table 5 and tested in the same manner as in Examples. The results show that, as shown in Table 5, PVC is higher than the specified range of the present invention, so that the resistance to cracking is inferior, the value of zero span elongation is small, and it is impossible to follow the hair crack of the body.

[0006]

EFFECTS OF THE INVENTION As is clear from the above examples, the water-based undercoating material of the present invention comprises a cross-linking reaction type specific multilayer structure emulsion and a specific inorganic powder, so that the outer wall of a building can be It has excellent adhesion and conformability to various bases, and can be used for topcoating with any coating material from weak solvent such as hard and soft to water-based, and has excellent adhesion to topcoating. In contrast to the conventional base adjustment, which required both the sealer and the base adjustment material (filler) to be used together, the sealer effect and the base adjustment effect (such as smoothing the unevenness and Since it also serves as both filling of pinholes and the like), it is very useful because it shortens the process.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C09D 163/00 PKE E04F 13/02 C 9127-2E

Claims (5)

[Claims] 1. A layer containing (A) a copolymer having an epoxy group, (B) a layer made of a copolymer inert to an epoxy group and a carboxyl group, and (C) a carboxyl group and an amide. Consisting of three layers of a copolymer having a group or two layers of (A) layer and (C) layer, with (A) layer as a central part, on its surface (B) layer, and on its surface The pigment volume concentration (hereinafter abbreviated as PVC) of the (C) layer or the multilayer structured emulsion in which the (C) layer is laminated on the surface of the (A) layer and the inorganic powder is 40 to 70%. A water-based base conditioning material that is mixed in this way. 2. A polymerizable monomer used for forming (a) an epoxy group is glycidyl methacrylate,
(B) The polymerizable monomer used to generate a carboxyl group is one or more ethylenically unsaturated carboxylic acid selected from (meth) acrylic acid, itaconic acid, maleic acid, and fumaric acid, and (c) an amide. The polymerizable monomer used to generate the group is (meth) acrylic amide, and the contents of (a), (b), and (c) are each based on all monomers constituting the multilayer structure emulsion,
(A) :( b) :( c) = 0.5-7.5 wt%: 0.
5 to 7.5% by weight: 0.5 to 5% by weight, The water-based undercoating material according to claim 1. 3. A multilayer structure type emulsion in which the glass transition temperature (hereinafter abbreviated as Tg) of the innermost layer is equal to or lower than that of the outermost layer, and the Tg of the formed film is −30 to 5 ° C. The water-based base conditioning material according to claim 1 or 2. 4. An outer wall of a building, wherein the outer wall of a building is coated with any one of claims 1 to 3 to adjust a groundwork, and further, a silicone-based aqueous resin-dispersed enamel is laminated and applied. Method. 5. A method for finishing an outer wall of a building, which comprises coating the outer wall of a building according to any one of claims 1 to 3 to adjust a groundwork, and further laminating a single layer elastic finish coating material. .