JP2014077146A - Aqueous primer composition for repairing, and repairing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aqueous primer composition for repairing used as a primer coating for repairing, e.g., to the outer wall of a building having a coating film exhibiting various functions such as low stain properties or high weather resistance.SOLUTION: The aqueous primer composition for repairing comprises: an anionic or cationic resin emulsion (A); a glycidyl group-containing silane coupling agent (B); and an amino group-containing silane coupling agent (C). The content of the glycidyl group-containing silane coupling agent (B) is 20 to 65 pts.mass to 100 pts.mass of the resin solid content of the anionic or cationic resin emulsion (A), the content of the amino group-containing silane coupling agent (C) is 2 to 15 pts.mass to 100 pts.mass of the resin solid content of the anionic or cationic resin emulsion (A), and also, the total of the content of the glycidyl group-containing coupling agent (B) and the content of the amino group-containing silane coupling agent (C) is 22 to 70 pts.mass to 100 pts.mass of the resin solid content of the anionic or cationic resin emulsion (A).

Description

  The present invention relates to a repairable water-based undercoating composition used for repairing exterior building materials and the like constituting an outer wall of a building.

  The exterior building materials used for the outer wall of a building such as a house are required to have various colors and design characteristics according to the preference of the home buyer and the user. Furthermore, due to the recent increase in needs for high weather resistance, so-called inorganic or inorganic-organic composite paints such as fluorine paints containing fluororesins and paints containing silicon resins and / or reactive silicon compounds are used as exterior building materials. It is being used. In addition, there is an increasing need for low contamination for the purpose of maintaining the cosmetic appearance. For this reason, forming the coating film which has hydrophilic property on the surface of the building material for exteriors is also performed.

  However, the coating films obtained using these paints may also deteriorate due to the effects of sunlight, rainfall, temperature, humidity, etc. when exposed outdoors for a long time. Even if it is not necessary, repainting may be required due to contamination due to long-term outdoor exposure or due to redesign of the house. However, the coating film having the above-mentioned performance is very difficult to repaint due to the special surface properties and special functions of the coating film provided by the commonly used repainting paint.

  Various undercoat paints (sealers) with improved adhesion by controlling the glass transition temperature, hydrophilic functional group, cross-linking structure, etc. of the resin in order to eliminate the problem of adhesion of the paint film due to repaints. Is being considered. However, since there are a wide variety of paints applied to exterior building materials, it is necessary to use different undercoats (sealers) depending on the type of paint being applied, which is not desirable from the viewpoint of work efficiency. It was.

  JP-A-2006-219648 (Patent Document 1) discloses (A) a carboxyl group-containing water-soluble resin having an acid value of 25 KOHmg / g or more and 200 KOHmg / g or less, and (B) a silane cup containing an epoxy group. An aqueous primer composition containing a ring agent is described (claim 1 etc.). This aqueous primer composition is described as being particularly effective as a primer for use in refurbishing porcelain tile surfaces (eg, [0041] paragraph).

  JP-A-2009-040874 (Patent Document 2) includes (I) an alkoxysilyl group-containing synthetic resin emulsion, (II) a substance that promotes hydrolysis / condensation of alkoxysilyl groups, and (III) an organosilicate and / or Or the coating method which apply | coats the curable composition containing the modified material to an inorganic type base material is described (Claim 1 etc.). This curable composition is described as exhibiting sufficient adhesion to an inorganic base material.

  Japanese Patent Application Laid-Open No. 2002-256221 (Patent Document 3) includes a self-emulsifying cationic aqueous dispersion having a hydroxyl group and an amino group and an epoxy group-containing organosilane, and the amino group of the cationic aqueous dispersion and the organo An aqueous primer composition in which the equivalent ratio of silane epoxy groups (amino group / epoxy group) is in the range of 0.5 to 2.0 is described (claim 1 and the like). This water-based primer composition is described as having excellent adhesion to various ceramic siding boards and also having good adhesion to various top coats.

JP 2006-219648 A JP 2009-040874 A JP 2002-256221 A

  As shown in Patent Documents 1 to 3, various undercoat paints (sealers) have been proposed so far. However, due to further diversification of exterior building materials in recent years, development of undercoat paints that can ensure good adhesion to more types of coating films in repair is required.

  An object of the present invention is to solve the above-described problems of the prior art. More specifically, the present invention provides a water-based undercoating composition for repair that is used as an undercoat for repairing the outer wall of a building having a coating film that exhibits various functions such as low contamination or high weather resistance. Is an issue.

The present invention
Anionic or cationic resin emulsion (A),
A glycidyl group-containing silane coupling agent (B), and an amino group-containing silane coupling agent (C),
A water-based undercoat paint composition for repair, comprising
Content of this glycidyl group containing silane coupling agent (B) is 20-65 mass parts with respect to 100 mass parts of resin solid content of anionic or cationic resin emulsion (A),
The content of the amino group-containing silane coupling agent (C) is 2 to 15 parts by mass with respect to 100 parts by mass of the resin solid content of the anionic or cationic resin emulsion (A), and the glycidyl group-containing silane. The total content of the coupling agent (B) and the amino group-containing silane coupling agent (C) is 22 to 70 parts by mass with respect to 100 parts by mass of the resin solid content of the anionic or cationic resin emulsion (A). is there,
An aqueous undercoat paint composition for repair is provided, which solves the above problems.

［式（１）中、Ｙはグリシジル基であり、Ｒ^１はエチレン基またはプロピレン基であり、Ｒ^２はメチル基またはエチル基であり、ｎは０または１である。］
で示される化合物であるのがより好ましい。 The glycidyl group-containing silane coupling agent (B) is represented by the following formula (1)

[In Formula (1), Y is a glycidyl group, R ¹ is an ethylene group or a propylene group, R ² is a methyl group or an ethyl group, and n is 0 or 1. ]
It is more preferable that it is a compound shown by these.

  Moreover, it is more preferable that the anionic or cationic resin emulsion (A) contains at least one of an acrylic resin emulsion or a silicone-containing acrylic resin emulsion.

In addition, the above-mentioned aqueous undercoating composition for repair includes a first liquid containing an anionic or cationic resin emulsion (A), a glycidyl group-containing silane coupling agent (B), and an amino group-containing silane coupling agent (C). And a mass ratio of the contents of the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C) is (B) / (C) = 5 to 15 It is more preferable that it is within the range.

  The present invention further provides a method for repairing an object to be coated, which includes a step of applying the above-described aqueous base coating composition for repairing to an object having a coating film, and then applying the top coating composition.

  The coating object is coated with a coating composition selected from an inorganic coating composition, an inorganic-organic composite coating composition, a fluorine coating composition, an acrylic silicone coating composition, and a low-contamination coating composition on the outermost surface. The aspect which is an inorganic material base material which has the coating film formed in this way is more preferable.

The aqueous undercoat paint composition for repair of the present invention comprises an anionic or cationic resin emulsion (A), a glycidyl group-containing silane coupling agent (B), and an amino group-containing silane coupling agent (C). In particular, by including the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C) in a specific mass range and a specific mass ratio, the storage stability of the coating composition is adversely affected. The adhesion to the object to be coated could be remarkably improved.
By using the water-based undercoat paint composition for repair of the present invention, an inorganic paint composition, an inorganic-organic composite paint composition, a fluorine paint composition, an acrylic silicone paint composition, a low-contamination paint composition, and the like are applied. A repair coating film having good adhesion can also be provided on a substrate having various functional coating films formed on the outermost surface. Therefore, the water-based undercoat paint composition for repair according to the present invention can be suitably used as an undercoat paint for repairing various exterior building materials having various functions.

Aqueous undercoat paint composition for repair An aqueous undercoat paint composition for repair of the present invention comprises an anionic or cationic resin emulsion (A), a glycidyl group-containing silane coupling agent (B), and an amino group-containing silane coupling agent ( C). In addition, the water-based undercoating composition for repair in this specification is a water-based undercoating used as an undercoat when a coating composition is formed on a coating film already formed on a coating object. It means a coating composition.

Anionic or cationic resin emulsion (A)
The repairable aqueous undercoat paint composition of the present invention contains a resin emulsion (A). And as this resin emulsion (A), an anionic resin emulsion or a cationic resin emulsion can be used.

  Examples of the anionic resin emulsion that can be used include an acrylic resin emulsion, a silicone-containing acrylic resin emulsion, a urethane resin emulsion, a vinyl acetate resin emulsion, a fluororesin emulsion, and a vinyl chloride resin emulsion. These resins may be used alone or in combination of two or more. As the anionic resin emulsion, an acrylic resin emulsion or a silicone-containing acrylic resin emulsion is preferably used.

  Examples of the acrylic resin emulsion used as the anionic resin emulsion include emulsions of acrylic resins obtained by polymerization of various polymerizable monomers. The said polymerizable monomer means what has at least one unsaturated bond, such as a vinyl group, in a molecule | numerator, and the derivative | guide_body of acrylic acid or methacrylic acid is included. The polymerizable monomer is not particularly limited, and examples thereof include ethylenically unsaturated carboxylic acid monomers such as acrylic acid, methacrylic acid, maleic acid, and itaconic acid; methyl (meth) acrylate, ethyl (meth) acrylate, ( Ethylenically unsaturated carboxylic acid alkyl ester monomers such as (meth) acrylic acid n-butyl and (meth) acrylic acid 2-ethylhexyl; Cycloalkyl group-containing polymerizable monomers such as (meth) acrylic acid cyclopentyl and (meth) acrylic acid cyclohexyl Monoester monomers of ethylenically unsaturated dicarboxylic acids such as ethyl maleate, butyl maleate, ethyl itaconate, butyl itaconate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, ( (Meth) acrylic acid 4-hydroxy Hydroxyl group-containing ethylenically unsaturated carboxylic acid alkyl ester monomers such as butyl, a reaction product of 2-hydroxyethyl (meth) acrylate and ε-caprolactone; aminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, Ethylenically unsaturated carboxylic acid aminoalkyl ester monomers such as (meth) butylaminoethyl acrylate; ethylenically unsaturated carboxylic acids such as aminoethyl (meth) acrylamide, dimethylaminomethyl (meth) acrylamide, and methylaminopropyl (meth) acrylamide Acid aminoalkylamide monomers; other amide group-containing ethylenic unsaturations such as acrylamide, methacrylamide, N-methylolacrylamide, methoxybutylacrylamide, diacetoneacrylamide Carboxylic acid monomers; Unsaturated fatty acid glycidyl ester monomers such as glycidyl acrylate and glycidyl methacrylate; Vinyl cyanide monomers such as (meth) acrylonitrile and α-chloroacrylonitrile; Saturated aliphatic carboxylic acids such as vinyl acetate and vinyl propionate Vinyl ester monomer: Styrene monomers such as styrene, α-methylstyrene, vinyltoluene and the like can be mentioned. These can be used alone or in combination of two or more. In the present specification, (meth) acrylic acid refers to acrylic acid or methacrylic acid. By using such an acrylic resin emulsion, it is possible to obtain good adhesion to building materials that are objects to be coated and good weather resistance, which is preferable.

  The carboxyl group-containing acrylic resin may form an aqueous polymer dispersion in which multi-layer structured particles composed of a core part and a shell part are dispersed. The multilayer structure particle is an acrylic polymer in which the resin forming the core part has a glass transition temperature of −10 to 70 ° C., and the resin forming the shell part is an acrylic polymer having a glass transition temperature of −25 to 50 ° C. Preferably there is. Moreover, the multilayer structure particle is an acrylic polymer in which the resin forming the core portion has a glass transition temperature of 0 to 40 ° C., and the resin forming the shell portion is in a glass transition temperature of −10 to 20 ° C. It is more preferable that An aqueous polymer dispersion in which such multilayer structure particles are dispersed can be prepared by a known production method described in JP-A No. 2002-12816.

  The glass transition temperature of the acrylic polymer can be calculated based on the known glass transition temperature and composition ratio of the constituent monomer or homopolymer.

  Examples of the silicone-containing acrylic resin emulsion include a polymer obtained by polymerization of a monomer composition further containing an alkoxysilyl group-containing polymerizable monomer in addition to the carboxyl group-containing acrylic monomer.

  The alkoxysilyl group-containing polymerizable monomer is not particularly limited as long as it is a polymerizable monomer containing an alkoxysilyl group having 1 to 14 carbon atoms. For example, trimethoxysilylpropyl (meth) acrylate, (meth) acrylic acid Triethoxysilylpropyl, tributoxysilylpropyl (meth) acrylate, dimethoxymethylsilylpropyl (meth) acrylate, methoxydimethylsilylpropyl (meth) acrylate, vinyltrimethoxysilane, vinyltriethoxysilane, vinyldimethoxymethylsilane, Examples thereof include vinylmethoxydimethylsilane and vinyltris (β-methoxyethoxy) silane. These can be used alone or in combination of two or more. Of these, trimethoxysilylpropyl (meth) acrylate, triethoxysilylpropyl (meth) acrylate, vinyltrimethoxysilane, and vinyltriethoxysilane are particularly preferable.

  Moreover, you may use the silicone containing acrylic resin emulsion obtained by introduce | transducing an organic silicone unit as a silicone containing acrylic resin emulsion. Methods for introducing the organosilicone unit include emulsion polymerization of a mixture of an organosilicone compound and an acrylic polymerizable monomer, hydrolysis, condensation reaction and radical polymerization, copolymerization of a monomer having a silicone functional group, acrylic polymerization. For example, a method of bonding an organosilicone compound to the surface of acrylic polymer particles by reacting the organosilicone compound with the coalescence. Two or more methods described above may be combined.

The organosilicon compound used in the above method is not particularly limited, and examples thereof include organosilane, hydrolyzate of organosilane, and condensate of organosilane.

The organosilane is generally represented by the following general formula (2)
(R ⁵ ) _n Si (OR ⁶ ) _4-n (2)
[In the formula, when two R ⁵ are present, they are the same or different and each represents a monovalent organic group having 1 to 8 carbon atoms. R ⁶ is the same or different and represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 6 carbon atoms. n is an integer of 0-2. ]
It is represented by

The hydrolyzate of the organosilane is a compound in which the OR ⁶ group of the organosilane represented by the general formula (2) is hydrolyzed. It is not necessary that 2 to 4 OR ⁶ groups contained in the organosilane are all hydrolyzed, for example, only one is hydrolyzed, two or more are hydrolyzed, or these It may be a mixture of

  The organosilane condensate is obtained by condensing silanol groups of an organosilane hydrolyzate to form a Si-O-Si bond. The organosilicone compound may be a mixture of all of the silanol groups, a mixture of a small part of the silanol groups, or a mixture of those having different degrees of condensation.

In the general formula (2), examples of the monovalent organic group having 1 to 8 carbon atoms of R ⁵ include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, and an i-butyl. Group, sec-butyl group, t-butyl group, n-hexyl group, n-heptyl group, n-octyl group, 2-ethylhexyl group and other alkyl groups; acetyl group, propionyl group, butyryl group, valeryl group, benzoyl group Acyl groups such as trioyl group and caproyl group; vinyl group, allyl group, cyclohexyl group, phenyl group, epoxy group, glycidyl group, (meth) acryloxy group, ureido group, amide group, fluoroacetamide group, isocyanate group, etc. In addition to these, substituted derivatives of these groups can be mentioned.

Examples of the substituent in the substituted derivative of R ⁵ include a halogen atom, a substituted or unsubstituted amino group, a hydroxyl group, a mercapto group, an isocyanate group, a glycidoxy group, a 3,4-epoxycyclohexyl group, and a (meth) acryloxy group. Ureido group, ammonium base and the like. However, the number of carbon atoms of R ⁵ consisting of substituted derivatives thereof is 8 or less including the carbon atoms in the substituent. In the general formula (2), when two R ⁵ are present, they may be the same as or different from each other.

The alkyl group having 1 to 5 carbon atoms for ^{R 6,} for example, a methyl group, an ethyl group, n- propyl group, i- propyl, n- butyl group, sec- butyl group, t- butyl radical, n -A pentyl group etc. can be mentioned, As a C1-C6 acyl group, an acetyl group, a propionyl group, a butyryl group, a valeryl group, a caproyl group etc. can be mentioned, for example. A plurality of R ⁶ present in the general formula (2) may be the same as or different from each other.

  The organosilane is not particularly limited, and examples thereof include tetraalkoxysilanes such as tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetra-i-propoxysilane, tetra-n-butoxysilane; Methoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, i-propyltrimethoxysilane, i-propyltriethoxysilane, n-butyltri Methoxysilane, n-butyltriethoxysilane, n-pentyltrimethoxysilane, n-hexyltrimethoxysilane, n-heptyltrimethoxysilane, n-octyltrimethoxysilane, vinyltrimethoxysilane, vinyl Riethoxysilane, cyclohexyltrimethoxysilane, cyclohexyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 3-chloropropyltrimethoxysilane, 3-chloropropyltriethoxysilane, 3,3,3-trifluoropropyltri Methoxysilane, 3,3,3-trifluoropropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 2-hydroxyethyltrimethoxysilane, 2-hydroxyethyltriethoxysilane, 2- Hydroxypropyltrimethoxysilane, 2-hydroxypropyltriethoxysilane, 3-hydroxypropyltrimethoxysilane, 3-hydroxypropyltriethoxysilane, 3-mercaptopro Rutrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-isocyanatopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, 3- (meth) acryloxypropyltrimethoxysilane, 3- (meth) attaacryloxy Trialkoxysilanes such as propyltriethoxysilane, 3-ureidopropyltrimethoxysilane, 3-ureidopropyltriethoxysilane; dimethyldimethoxysilane, dimethyldiethoxysilane, diethyldimethoxysilane Diethyldiethoxysilane, di-n-propyldimethoxysilane, di-n-propyldiethoxysilane, di-i-propyldimethoxysilane, di-i-propyldiethoxysilane, di-n-butyldimethoxysilane, di- n-butyldiethoxysilane, di-n-pentyldimethoxysilane, di-n-pentyldiethoxysilane, di-n-hexyldimethoxysilane, di-n-hexyldiethoxysilane, di-n-heptyldimethoxysilane, di -N-heptyldiethoxysilane, di-n-octyldimethoxysilane, di-n-octyldiethoxysilane, di-n-cyclohexyldimethoxysilane, di-n-cyclohexyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane In addition to dialkoxysilanes such as Methyl triacetyl silane, dimethyl di acetyloxy silane can be exemplified.

  Of these, trialkoxysilanes and dialkoxysilanes are preferably used. Also, as the trialkoxysilanes, methyltrimethoxysilane and methyltriethoxysilane are preferable, and dialkoxysilanes are more preferable. Is preferably dimethyldimethoxysilane or dimethyldiethoxysilane.

  Any appropriate cationic resin emulsion can be used as long as it is a cationic emulsion used as a base resin of a coating composition. The cationic resin emulsion is preferably an acrylic resin emulsion obtained by polymerizing an amino group-containing ethylenically unsaturated monomer and another polymerizable monomer copolymerizable with the amino group-containing ethylenically unsaturated monomer. Can be mentioned.

  Examples of the amino group-containing ethylenically unsaturated monomer include amino group-containing (meth) acrylic acid esters such as dimethylaminoethyl (meth) acrylate, acrylamide, diacetone acrylamide, N, N-dimethylaminopropyl acrylamide, N, N- Examples include amino group-containing (meth) acrylamides such as dimethylacrylamide, acryloylmorpholine, N-isopropylacrylamide, N, N-diethylacrylamide, and diethylaminopropylacrylamide. Among these, dimethylaminoethyl methacrylate is preferable from the viewpoint of reactivity. These monomers can also be used in combination of two or more.

  Other polymerizable monomers copolymerizable with the amino group-containing ethylenically unsaturated monomer include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, and (meth) acrylic. Ethylenically unsaturated carboxylic acid alkyl ester monomers such as 2-ethylhexyl acid; Cycloalkyl group-containing polymerizable monomers such as cyclopentyl (meth) acrylate and cyclohexyl (meth) acrylate; ethyl maleate, butyl maleate, ethyl itaconate Monoester monomer of ethylenically unsaturated dicarboxylic acid such as butyl itaconate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, (meth) 2-hydroxyethyl acrylate and Hydroxyl group-containing ethylenically unsaturated carboxylic acid alkyl ester monomer such as a reaction product with caprolactone; Unsaturated fatty acid glycidyl ester monomer such as glycidyl acrylate and glycidyl methacrylate; Vinyl cyanide such as (meth) acrylonitrile and α-chloroacrylonitrile Monomer, saturated aliphatic carboxylic acid vinyl ester monomers such as vinyl acetate and vinyl propionate; and styrene monomers such as styrene, α-methylstyrene and vinyltoluene. These can be used alone or in combination of two or more.

  The anionic resin emulsion and the cationic resin emulsion may be prepared by, for example, emulsion polymerization of the monomer in the presence of an emulsifier and a polymerization initiator, or solution polymerization of the monomer in a solvent using a radical polymerization initiator. The polymer solution obtained can be prepared by a method of neutralizing with a neutralizing agent and performing phase transition with water. Each of the above methods can be performed under conditions well known by those skilled in the art.

  Any appropriate emulsifier can be used in the emulsion polymerization. Specific examples of emulsifiers that can be used in emulsion polymerization include anionic emulsifiers such as soaps, alkyl sulfonates, and polyoxyethylene alkyl sulfates in the case of anionic resin emulsions, and stearylamine hydrochloride in the case of cationic resin emulsions. Examples include cationic emulsifiers such as salts, lauryltrimethylammonium chloride, and trimethyloctadecylammonium chloride. Further, nonionic emulsifiers such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polypropylene glycol ethylene oxide adduct, polyethylene glycol fatty acid ester, polyoxyethylene sorbitan fatty acid ester can be used in any case. These emulsifiers can be used alone or in combination of two or more.

  In addition, a surfactant having a radical polymerizable carbon-carbon double bond (hereinafter referred to as “reactive emulsifier”) can also be used as the emulsifier. If a reactive emulsifier is used as the emulsifier, a sealer coating having high water resistance can be obtained. As the reactive emulsifier, for example, a nonionic surfactant having a basic structure of polyoxyethylene alkylphenyl ether and a radically polymerizable propenyl group introduced into a hydrophobic group, a cationic surfactant having a quaternary ammonium salt structure , Anionic surfactants having a double bond between ethylenic carbon atoms containing a sulfonic acid group, a sulfonate group, a sulfate ester group, and / or an ethyleneoxy group. Moreover, the said reactive emulsifier may use a commercial item. Specifically as a commercial item of the reactive emulsifier, as a nonionic surfactant, Aqualon RN-10, Aqualon RN-20, Aqualon RN-30, Aqualon RN-50 (all manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), DECanol SDX-236 (ADEKA Corporation) as a cationic surfactant such as ADEKA rear soap NE-10, ADEKA rear soap ER-10, ADEKA rear soap NE-20, ADEKA rear soap ER-20 (all manufactured by ADEKA) ), Katchinal DAMLAC-1, Katchinal DAMLAC-2 (all manufactured by Toho Chemical Co., Ltd.), etc., Antox MS-6, Antox MS-2N (all manufactured by Nippon Emulsifier Co., Ltd.), Eleminol JS-2 (manufactured by Sanyo Kasei Co., Ltd.) ), Latemul S-120, Lateml PD-104 (both manufactured by Kao Corporation), Adekaria Soap SR -10, Adekaria soap SE-10 (all manufactured by Adeka), Aqualon KH-05, Aqualon HS-10 (all manufactured by Daiichi Kogyo Seiyaku) and the like.

  The amount of the emulsifier used is preferably 0.5 to 15% by mass with respect to the total amount of monomers used for the polymerization of the anionic resin emulsion or the cationic resin emulsion.

  In the above emulsion polymerization, polymerization initiators include azo initiators such as azobisisobutylnitrile, azobisvaleronitrile, 2,2′-azobis (2-aminodipropane) dihydrochloride; benzoyl peroxide, lauryl Organic peroxide initiators such as oxide and t-butyl peroxide; hydrogen peroxide and the like can be used. Moreover, you may use the redox initiator which used reducing agents, such as Rongalite, L ascorbic acid, and an organic amine together. These initiators can be used alone or in combination of two or more.

  The amount of the polymerization initiator used is preferably 0.01 to 10% by mass relative to the total amount of monomers used for the polymerization of the anionic resin emulsion or the cationic resin emulsion. Moreover, it is preferable that the polymerization temperature in the said emulsion polymerization is 30-90 degreeC, and it is preferable that polymerization time is 3 to 12 hours. The monomer concentration during the polymerization reaction is preferably 30 to 70% by mass.

  The radical polymerization initiator that can be used in the solution polymerization is not particularly limited, and examples thereof include azobisisobutyronitrile, benzoyl peroxide, t-butyl perbenzoate, t-butyl hydroperoxide, di- t-Butyl peroxide, cumene hydroperoxide, or the like can be used alone or in combination. In addition, a chain transfer agent such as octyl mercaptan or dodecyl mercaptan can be added to adjust the molecular weight of the resin.

The neutralizing agent used for neutralizing the polymer obtained by the solution polymerization is an inorganic base and / or an organic base in the case of an anionic resin emulsion, and an inorganic acid and / or an organic base in the case of a cationic resin emulsion. Acids. Specific examples of the inorganic base or organic base include ammonia, triethylamine, propylamine, dibutylamine, amylamine, 1-aminooctane, 2-dimethylaminoethanol, ethylaminoethanol, 2-diethylaminoethanol, 1-amino-2-propanol. 2-amino-1-propanol, 2-amino-2-methyl-1-propanol, 3-amino-1-propanol, 1-dimethylamino-2-propanol, 3-dimethylamino-1-propanol, 2-propyl Examples include aminoethanol, ethoxypropylamine, aminobenzyl alcohol, morpholine, sodium hydroxide, and potassium hydroxide. Specific examples of the inorganic acid include hydrochloric acid and nitric acid. Specific examples of the organic acids include aliphatic saturated carboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, and lactic acid. The amount of the neutralizing agent varies depending on the concentration of the polymerizable unsaturated monomer to be used, but is usually 0.2 to 1.0 mol of the neutralizing agent with respect to 1 mol of the carboxyl group or amino group in the polymer ( Neutralization rate: 20-100%). Thus, the aqueous dispersion according to the present invention neutralizes the carboxyl group resulting from the carboxyl group-containing ethylenically unsaturated monomer with a base, or neutralizes the base resulting from the amino group-containing ethylenically unsaturated monomer with an acid. By doing so, an anionic or cationic aqueous dispersion is obtained. When the amount of the neutralizing agent is insufficient, the polymer may be precipitated and cannot be formed into a dispersion. On the other hand, when the neutralizing agent is excessive, the polymer itself is dissolved and dispersed. It may become a water-soluble resin instead of a liquid.
When it is desired to reduce the volatile organic compound (VOC) contained in the finally obtained coating composition, it is preferably an inorganic base or acid. Moreover, if it has a weak odor, inorganic bases, such as sodium hydroxide and potassium hydroxide, inorganic acids, such as hydrochloric acid and nitric acid, organic acids, such as lactic acid, etc. can be mentioned.

  Here, the usage-amount of the solvent at the time of superposing | polymerizing is 40-60 mass% with respect to the total mass of the monomer to be used, a solvent, and a polymerization initiator, for example. Moreover, the amount of the solvent at the time of solvent removal is 5-30 mass% with respect to the total mass of the obtained polymer, a solvent, and water, More preferably, it is 10-25 mass%. When the amount of the solvent used is less than the above range, the viscosity of the solution system becomes high when the aqueous dispersant is synthesized, and sufficient neutralization and phase conversion cannot be performed. On the other hand, if it exceeds the above range, an aqueous dispersant can be obtained, but it is not preferable because a large amount of solvent must be distilled off.

  Moreover, the usage-amount of an ethylenically unsaturated monomer, a hydroxyl-containing ethylenically unsaturated monomer, and an amino group-containing ethylenically unsaturated monomer can be adjusted so that Tg of the polymer obtained may be -10-30 degreeC. preferable.

  The anionic resin emulsion preferably has an acid value in the range of 5 to 50 mgKOH / g, and more preferably in the range of 5 to 20 mgKOH / g. When the acid value is less than 5 mgKOH / g, the stability of the anionic resin emulsion in water may be lowered. Moreover, when an acid value exceeds 50 mgKOH / g, there exists a possibility that the water resistance of the obtained coating film may fall. In addition, in this specification, an acid value represents a solid content acid value and can be measured by the well-known method described in JISK0070.

  The anionic resin emulsion preferably has a hydroxyl value in the range of 0 to 85 mgKOH / g, more preferably in the range of 0 to 40 mgKOH / g. When the hydroxyl value exceeds 85 mgKOH / g, the water resistance of the obtained coating film may be lowered. In addition, in this specification, a hydroxyl value represents a solid content hydroxyl value and can be measured by the well-known method described in JISK0070.

  The cationic resin emulsion preferably has an amine value in the range of 10 to 200 mgKOH / g, and more preferably in the range of 20 to 60 mgKOH / g. When the amine value is less than 10 mgKOH / g, the stability of the cationic resin emulsion in water may be reduced. On the other hand, when the amine value exceeds 200 mgKOH / g, the water resistance of the obtained coating film may be lowered. In addition, in this specification, an amine value represents a solid content amine value and can be measured by the well-known method described in JISK7237.

  The cationic resin emulsion preferably has a hydroxyl value in the range of 0 to 85 mgKOH / g. When the hydroxyl value exceeds 85 mgKOH / g, the water resistance of the obtained coating film may be lowered. In addition, in this specification, a hydroxyl value represents a solid content hydroxyl value and can be measured by the well-known method described in JISK0070.

  The particle diameter of the anionic resin emulsion or the cationic resin emulsion is preferably 20 to 250 nm, and more preferably 60 to 120 nm. When the particle diameter is less than 20 nm, the solid content of the paint may be significantly reduced. When the particle diameter exceeds 250 nm, the adhesion to the object to be coated may be reduced. In the present specification, the particle diameter is an average particle diameter determined by a dynamic light scattering method. Specifically, an electrophoretic light scattering photometer ELS-800 (manufactured by Otsuka Electronics Co., Ltd.) or the like is used. Can be measured using.

  The anionic or cationic resin emulsion (A) is preferably a cationic resin emulsion from the viewpoint of suitability for various objects to be coated.

Glycidyl group-containing silane coupling agent (B)
The water-based undercoat paint composition for repair of the present invention contains a glycidyl group-containing silane coupling agent (B). The content of the glycidyl group-containing silane coupling agent (B) is 20 to 65 parts by mass with respect to 100 parts by mass of the resin solid content of the anionic or cationic resin emulsion (A). When the content of the glycidyl group-containing silane coupling agent (B) is less than 20 parts by mass, the coating film adhesion in the case of coating on a coating film of a combination of a fluorine-based paint and a hydrophilic coating is reduced. Become. In addition, when the content of the glycidyl group-containing silane coupling agent (B) exceeds 65 parts by mass, cracks are generated when the top coating composition is applied and dried after the repair coating composition is applied. There is a bug to do.

［式（１）中、Ｙはグリシジル基であり、Ｒ^１はエチレン基またはプロピレン基であり、Ｒ^２はメチル基またはエチル基であり、ｎは０または１である。］
で示される化合物であるのが好ましい。 The glycidyl group-containing silane coupling agent (B) is represented by the following formula (1)

[In Formula (1), Y is a glycidyl group, R ¹ is an ethylene group or a propylene group, R ² is a methyl group or an ethyl group, and n is 0 or 1. ]
It is preferable that it is a compound shown by these.

As a specific example of the glycidyl group-containing silane coupling agent (B), for example,
3-glycidoxypropylmethyldimethoxysilane,
3-glycidoxypropyltrimethoxysilane,
3-glycidoxypropylmethyldiethoxysilane,
Examples include 3-glycidoxypropyltriethoxysilane. Examples of these commercially available products include KBM403, KBE402, KBE403 (all manufactured by Shin-Etsu Silicone). It is more preferable to use 3-glycidoxypropyltrimethoxysilane or 3-glycidoxypropyltriethoxysilane as the glycidyl group-containing silane coupling agent (B). By using these, there is an advantage that better coating film adhesion can be obtained.

Amino group-containing silane coupling agent (C)
The water-based undercoat paint composition for repair according to the present invention contains an amino group-containing silane coupling agent (C). The content of the amino group-containing silane coupling agent (C) is 2 to 15 parts by mass with respect to 100 parts by mass of the resin solid content of the anionic or cationic resin emulsion (A). When the content of the amino group-containing silane coupling agent (C) is less than 2 parts by mass, the coating film adhesion in the case of coating on a coating film of a combination of an inorganic paint and a photocatalyst coating is lowered. . In addition, when the content of the amino group-containing silane coupling agent (C) exceeds 15 parts by mass, cracks occur when the top coating composition is applied and dried after the repair coating composition is applied. There is a bug to do.

  Specific examples of the amino group-containing silane coupling agent (C) include, for example, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane. N-2- (aminoethyl) -3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene ) Propylamine, N-phenyl-3-aminopropyltrimethoxysilane, N- (vinylbenzyl) -2-aminoethyl-3-aminopropyltrimethoxysilane, and the like. Examples of these commercially available products include KBM602, KBM603, KBE603, KBM903, and KBE903 (all manufactured by Shin-Etsu Silicone). As an amino group-containing silane coupling agent (C), N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- (Aminoethyl) -3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, and 3-aminopropyltriethoxysilane are more preferably used. By using these, there exists an advantage that the outstanding coating-film adhesiveness can be obtained.

  In the present invention, the total content of the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C) is 100 masses of the resin solid content of the anionic or cationic resin emulsion (A). It is on condition that it is 22-70 mass parts with respect to a part. When the total content of the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C) is less than 22 parts by mass, on the coating film of a combination of a fluorine-based paint and a hydrophilic coating, Or there exists a possibility that the coating-film adhesiveness in the case of coating on a photocatalyst coating film may fall. Moreover, when the total amount of content of a glycidyl group containing silane coupling agent (B) and an amino group containing silane coupling agent (C) exceeds 70 mass parts, there exists a possibility that a crack may generate | occur | produce in the obtained coating film. .

Other components In addition to the said component (A)-(C), other components, such as an additive as needed, may be added to the aqueous | water-based undercoat coating composition for repair of this invention. Other ingredients that can be used include, for example, pigments, film-forming aids, viscosity modifiers, surface modifiers, antiseptics, fungicides, algaeproofing agents, antifoaming agents, light stabilizers, UV absorbers, oxidation Examples thereof include an inhibitor and a pH adjuster.

Method for preparing water-based undercoat paint composition for repair The water-based undercoat paint composition for repair of the present invention comprises an anionic or cationic resin emulsion (A), a glycidyl group-containing silane coupling agent (B), and an amino group-containing silane coupling. The agent (C) and other components as required can be prepared by mixing them by a commonly used method.

  As another example of the aqueous undercoating composition for repair of the present invention, a first liquid containing an anionic or cationic resin emulsion (A), a glycidyl group-containing silane coupling agent (B), and an amino group-containing silane coupling The aspect which is a 2 liquid type coating composition consisting of the 2nd liquid containing an agent (C) is mentioned. In the case of a two-component coating composition, there is an advantage that workability at the site where repainting is performed is improved.

  The water-based undercoating composition for repair of the present invention comprises both a glycidyl group-containing silane coupling agent (B) and an amino group-containing silane coupling agent (C), a glycidyl group-containing silane coupling agent (B) and an amino group. It is preferable that the mass ratio of the content of the contained silane coupling agent (C) is included in an amount in the range of (B) / (C) = 5-15, (B) / (C) = 7-14 It is more preferable to include the amount within the range, and it is even more preferable to include the amount within the range of (B) / (C) = 7-11. In the conventional coating composition, there is almost no detailed registration of the coating containing both the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C). Since the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C) are components that easily react with each other, the inclusion of both of them in the coating composition adversely affects the storage stability of the coating. This is because it often has When the mass ratio represented by (B) / (C) exceeds 15, there is a possibility that the coating film adhesion in the case of coating on the coating film of the photocatalyst coating is lowered. Moreover, when the mass ratio shown by (B) / (C) is less than 5, the storage stability of the 2nd liquid which mixed (B) and (C) falls, and there exists a possibility of gelatinizing.

Method for repairing article to be coated By using the water-based undercoating composition for repair of the present invention, it becomes possible to easily carry out repair painting of an article having various coating films. Here, the repair means that, for example, when the coating film deteriorates over time or a coating film defect occurs for some reason, the entire coating film or a part thereof is applied again. Examples of an object to be coated with the repairable aqueous undercoat paint composition of the present invention include, for example, various base materials, and an inorganic paint composition, an inorganic-organic composite paint composition, and a fluorine paint composition on the outermost surface of the base material. And a base material having a coating film formed by coating a coating composition selected from an acrylic silicone coating composition and a low-contamination coating composition.

  It does not specifically limit as said base material, For example, a metal base material, a plastic base material, an inorganic material base material etc. can be mentioned. It does not specifically limit as said metal base material, For example, an aluminum plate, an iron plate, a galvanized steel plate, an aluminum galvanized steel plate, a stainless steel plate, a tin plate etc. can be mentioned. Examples of the plastic substrate include an acrylic plate, a polyvinyl chloride plate, a polycarbonate plate, an ABS plate, a polyethylene terephthalate plate, and a polyolefin plate. Examples of the inorganic material substrate include ceramic building materials and glass substrates described in JIS A 5422, JIS A 5430, and the like. Among these, in the present invention, an inorganic material base material, in particular, a wall surface or a roof such as an inner wall or an outer wall of a building such as a house or a building, a ceramic building material, concrete, ALC, and other inorganic building materials are preferable. More preferred.

It is formed by coating a coating composition selected from an inorganic coating composition, an inorganic-organic composite coating composition, a fluorine coating composition, an acrylic silicone coating composition and a low-contamination coating composition on the outermost surface of the substrate. As a specific example of a substrate having a coated film, for example,
Excelsior light sera 15 (manufactured by Keimu Co., Ltd., having an outermost surface formed by an inorganic coating composition and a photocatalytic coating material),
Moen Xcellade 18 (manufactured by Nichiha, having an outermost surface formed by a fluorine-based paint composition and a hydrophilic coating material),
AT-WALL15Y (manufactured by Asahi Tostem Co., Ltd., having an outermost surface formed by a low-contamination fluorine-based paint composition)
AT-WALL15X (manufactured by Asahi Tostem Co., Ltd., having an outermost surface formed by a low-contamination acrylic silicone coating composition),
Etc.
In the present specification, the “low-contamination paint composition” means a paint composition that exhibits the property that dirt is difficult to adhere to the obtained coating film. For example, a photocatalyst coating material (superhydrophilic and organic matter by photocatalyst) Low contamination performance is exhibited by degradability), low-contamination acrylic silicone paint composition, low-contamination fluororesin paint composition, and hydrophilic coating material mainly composed of an aqueous dispersion of silica fine particles. .

  The method for applying the repairable aqueous undercoat paint composition for repair of the present invention is not particularly limited. The coating method currently used can be mentioned. These can be appropriately selected according to the use of the substrate.

  The water-based undercoating composition for repairing is preferably applied under conditions such that the dry film thickness is, for example, 5 to 100 μm, more preferably 10 to 40 μm.

  The coated film thus coated may be dried at room temperature, preferably 10 to 30 ° C., for 6 hours to 1 month, preferably 1 day to 1 week, if necessary.

  Thus, after applying the repairing aqueous undercoat paint composition of the present invention, the topcoat paint composition is applied. The top coating composition is not particularly limited, and examples thereof include a solvent-based acrylic coating composition, a solvent-based urethane coating composition, a solvent-based silicone coating composition, a solvent-based fluorine coating composition, a water-based acrylic coating composition, Examples thereof include an aqueous urethane coating composition, an aqueous silicone coating composition, an aqueous fluorine coating composition, and an inorganic coating composition.

  The top coating composition is preferably applied under conditions such that the dry film thickness is, for example, 5 to 100 μm, more preferably 10 to 40 μm. The coating film obtained by applying the top coating composition is preferably dried at room temperature, preferably 10 to 30 ° C., for 1 day to 1 week or longer, preferably 2 weeks or longer.

  The following examples further illustrate the present invention, but the present invention is not limited thereto. In the examples, “parts” and “%” are based on mass unless otherwise specified.

Example 1
Preparation of water-based undercoating composition for repair (1 ) 100 parts of Polysol AP-1350 (acrylic resin emulsion manufactured by Showa Polymer Co., Ltd., amine value 18 mgKOH / g, hydroxyl value 0 mgKOH / g, particle diameter 65 nm) as a cationic resin emulsion ( Solid content mass conversion), 10 parts of texanol (made by Eastman) and 90 parts of deionized water as a film-forming aid were stirred and mixed to make the first solution, and KBM-403 (a glycidyl group-containing silane cup made by Shin-Etsu Silicone) A second liquid was prepared by stirring and mixing 45 parts of a ring agent and 5 parts of KBM-602 (amino group-containing silane coupling agent manufactured by Shin-Etsu Silicone Co., Ltd.) (both solid mass conversion). After that, the above first liquid and second liquid are stirred and mixed, and Adekanol UH-420 (Adeka Viscosity Adjuster) is added and mixed for 13 seconds with Ford Cup # 4. An aqueous undercoat paint composition (1) was prepared.

Exage light photo-cera 15 (inorganic material base material manufactured by Keimu Co., Ltd.) having a multilayer coating film obtained by applying an inorganic coating composition and a photocatalyst coating material to the obtained aqueous primer coating composition (1) Then, it was applied with a brush so as to have a dry film thickness of 20 μm, and dried at room temperature for 24 hours to form a coating film. On top of that, aqueous silicon sera UV (Nippon Paint Co., Ltd. architectural top coat) was applied with a brush to a dry film thickness of 40 μm and dried at 23 ° C. for 7 days to form a repair coating film.
In addition, with respect to Moen Xcellade 18 (inorganic material base material manufactured by Nichiha) having a multilayer coating film obtained by applying a fluorine-based paint and a hydrophilic coating material on the outermost surface, A repair coating film was formed in the same manner.

Examples 2-27 and Comparative Examples 1-9
Preparation of water-based undercoat paint compositions for repair (2) to (36) Water-based undercoat paint compositions for repair (2) to (13) are the amounts shown in the table below for the amount of glycidyl group-containing silane coupling agent (B). The type and amount of the amino group-containing silane coupling agent (C) were changed to those shown in the following table, and the same preparation as in Example 1 was performed.
Aqueous undercoat paint compositions for repair (14) to (20) were prepared using Joncrill 537 (an acrylic resin emulsion manufactured by BASF, solid content acid value 70 mgKOH / g, hydroxyl value) as anionic resin emulsion 1 instead of Polysol AP-1350. 0 mg KOH / g, average particle diameter 70 nm), and the amount of the glycidyl group-containing silane coupling agent (B) is changed to the amount shown in the following table, and the type and amount of the amino group-containing silane coupling agent (C) are changed. It changed into what is shown in the following table | surface, and prepared like Example 1.
Water-based undercoating compositions (21) to (26) for repair use Joncrill 537 instead of Polysol AP-1350, and glycidyl group-containing silane coupling agent (B) and amino group-containing silane coupling agent (C ) Was changed in the manner and amount shown in the table below and prepared in the same manner as in Example 1.
A water-based undercoating composition for repair (27) is Boncoat 520S-EF (silicone-containing acrylic resin emulsion manufactured by DIC, solid content acid value 13 mgKOH / g, hydroxyl value 0 mgKOH as anionic resin emulsion 2 instead of Polysol AP-1350 / G, average particle diameter 150 nm), and the amount of the glycidyl group-containing silane coupling agent (B) is changed to the amount shown in the table below. The type and amount of the amino group-containing silane coupling agent (C) are as follows: It changed into what is shown in a table | surface, and prepared like Example 1.
The water-based undercoat paint compositions (28) to (36) for repair are changed to those shown in the following table in the amounts of the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C), Prepared in the same manner as in Example 1.

  Coating was carried out in the same procedure as in Example 1 using the obtained water-based undercoat paint compositions for repair (2) to (36).

  The following evaluation was performed using the coating film formed by the said Example and comparative example.

Adhesion evaluation of the repair coating After repairing the repair coating formed on the Excelsior Kera Serra 15 and Moen Xcellade 18 with a 4mm gobang 25 mask loss cut, cello tape (registered trademark, manufactured by Nichiban Co., Ltd.) is attached and peeled off. A test was conducted. The degree of peeling was visually evaluated according to the following criteria. (Pass line: 3 points or more)
5 points: The edges of the cuts are completely smooth and there is no peeling in any lattice eye 4 points: The peeling rate is less than 5% 3 points: The peeling rate is 5% or more and less than 15% 2 points: The peeling rate is 15% or more and 35% Less than 1 point: peeling rate of 35% or more

Evaluation of generation of cracks during drying of water-based topcoat paint The coated plate obtained in the above repair film preparation example was observed visually and with a 30-fold magnifier, and evaluated according to the following criteria. (Pass line: 3 points or more)
5 points: No abnormalities 4 points: Cracks occurred within 3% of the whole with a loupe 3 points: Cracks occurred within 3% exceeding 3% of the whole with a loupe 2 points: Cracks within 5% of the whole visually 1 point: Crack generated on the entire surface by visual inspection

Storage stability of the second liquid Glycidyl group-containing silane coupling agent and amino group-containing silane coupling agent are mixed in a predetermined composition , and the mixture is put in a sealed container, and the state of the mixture after one week has passed at 60 ° C. Visual evaluation was made.
○: No sedimentation, separation, or solidification.
X: Sedimentation, separation and solidification occur.

In the table above,
KBM403: 3-glycidoxypropyltrimethoxysilane,
KBE402: 3-glycidoxypropylmethyldiethoxysilane,
KBE403: 3-glycidoxypropyltriethoxysilane,
KBM602: N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane,
KBM603: N-2- (aminoethyl) -3-aminopropyltrimethoxysilane,
KBE603: N-2- (aminoethyl) -3-aminopropyltriethoxysilane,
KBM903: 3-aminopropyltrimethoxysilane,
KBE903: 3-aminopropyltriethoxysilane,
(All are Shin-Etsu Silicone)
Indicates.

In the water-based undercoat paint compositions for repair used in the examples, the adhesion of the repair coating film has reached the acceptance standard, and even when the water-based overcoat paint composition is applied and dried, there are significant cracks. There was no outbreak.
On the other hand, in Comparative Example 1 in which the content of the glycidyl group-containing silane coupling agent (B) exceeds 65 parts, the occurrence of cracks was visually observed after the aqueous top coating composition was applied and dried.
In Comparative Example 2 in which the content of the glycidyl group-containing silane coupling agent (B) was less than 20 parts, the adhesion performance of the repair coating film to the Moen Excellar 18 was inferior.
In Comparative Example 3 in which the content of the amino group-containing silane coupling agent (C) exceeds 15 parts, the occurrence of cracks was visually observed after the aqueous top coating composition was applied and dried.
In Comparative Example 4 in which the content of the amino group-containing silane coupling agent (C) was less than 2 parts, the adhesion performance of the repair coating film to Excelsior Serra 15 was inferior.
The total amount of the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C) is 70 masses relative to 100 mass parts of the resin solid content of the anionic or cationic resin emulsion (A). In Comparative Example 5 exceeding part, after the aqueous top coating composition was applied and dried, the occurrence of cracks was visually observed.
The total content of the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C) is 22 masses per 100 mass parts of the resin solid content of the anionic or cationic resin emulsion (A). In Comparative Example 6 which is less than the part, the adhesion performance of the repair coating film on the Moen Excelder 18 was inferior.
In Comparative Example 7 which does not include any of the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C), the repair coating film was applied to both Moen Excellar 18 and Excelsior Serra 15 The adhesion performance was extremely inferior.
In Comparative Example 8 that did not include the amino group-containing silane coupling agent (C), the adhesion performance of the repair coating film to the Excelsior light Sera 15 was remarkably inferior.
In Comparative Example 9 that did not contain the glycidyl group-containing silane coupling agent (B), the adhesion performance of the repair coating film to the moene excellade 18 was remarkably inferior.

  By using the water-based undercoat paint composition for repair of the present invention, an inorganic paint composition, an inorganic-organic composite paint composition, a fluorine paint composition, an acrylic silicone paint composition, a low-contamination paint composition, and the like are applied. A repair coating film having good adhesion can also be provided on a substrate having various functional coating films formed on the outermost surface. Therefore, the water-based undercoat paint composition for repair according to the present invention can be suitably used as an undercoat paint (multi-sealer) in repair of various exterior building materials having various functions.

Claims (6)

Anionic or cationic resin emulsion (A),
A glycidyl group-containing silane coupling agent (B), and an amino group-containing silane coupling agent (C),
A water-based undercoat paint composition for repair, comprising
Content of this glycidyl group containing silane coupling agent (B) is 20-65 mass parts with respect to 100 mass parts of resin solid content of anionic or cationic resin emulsion (A),
Content of this amino group containing silane coupling agent (C) is 2-15 mass parts with respect to 100 mass parts of resin solid content of anionic or cationic resin emulsion (A), and this glycidyl group containing silane The total content of the coupling agent (B) and the amino group-containing silane coupling agent (C) is 22 to 70 parts by mass with respect to 100 parts by mass of the resin solid content of the anionic or cationic resin emulsion (A). is there,
Water-based undercoat paint composition for repair. The glycidyl group-containing silane coupling agent (B) is represented by the following formula (1):

[In Formula (1), Y is a glycidyl group, R ¹ is an ethylene group or a propylene group, R ² is a methyl group or an ethyl group, and n is 0 or 1. ]
The water-based undercoat paint composition for repair according to claim 1, which is a compound represented by the formula:   The aqueous base coating composition for repair according to claim 1 or 2, wherein the anionic or cationic resin emulsion (A) contains at least one of an acrylic resin emulsion or a silicone-containing acrylic resin emulsion. The water-based undercoat paint composition for repair contains a first liquid containing an anionic or cationic resin emulsion (A), a glycidyl group-containing silane coupling agent (B), and an amino group-containing silane coupling agent (C). And a mass ratio of the contents of the glycidyl group-containing silane coupling agent (B) and the amino group-containing silane coupling agent (C) is in the range of (B) / (C) = 5-15. Is within,
The water-based undercoat paint composition for repair according to any one of claims 1 to 3.   A method for repairing an object to be coated, comprising a step of applying a water-based undercoating composition for repair according to any one of claims 1 to 4 to an object to be coated having a coating film, and then applying a top coating composition.   The coated object is coated with a coating composition selected from an inorganic coating composition, an inorganic-organic composite coating composition, a fluorine coating composition, an acrylic silicone coating composition, and a low-contamination coating composition on the outermost surface. The repair method of the to-be-coated object of Claim 5 which is an inorganic material base material which has the coating film formed in this way.