JPS60171280A - Roof tile painting method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention relates to a method for coating roof tiles that provides a coating film with excellent weather resistance and durability. Conventionally, the method of painting slate tiles and cement tiles has been to apply an acrylic-urethane paint or lacquer type paint as an undercoat, and then apply an afryl urethane type paint or lacquer type paint as a top coat. When lacquer-type acrylic resin paint is used as the topcoat paint, it has disadvantages such as the gloss of the paint film decreasing in a short period of time and cracking due to poor water resistance, weather resistance, and durability. be. When an acryl-urethane paint is used, the acrylic-urethane paint cures insufficiently due to the moisture contained in the base roof tiles and the moisture in the air, resulting in a loss of gloss in a relatively short period of time. There are drawbacks such as cracks and cracks. In addition, unglazed tiles are generally used as glazed tiles by applying a glaze and firing them, but these tiles also have the drawback of poor crack resistance and the possibility of cracks on the surface after a short period of use. The inventors of the present invention have conducted extensive research in view of the current situation, and have found that the above-mentioned drawbacks can be significantly improved by applying a solution-type paint containing a polymer containing a hydrolyzable silyl group as a top coat. The present invention was completed based on the discovery that a coated tile with a high quality coating can be obtained. That is, 1. When painting tiles selected from the group consisting of slate tiles, cement tiles, and unglazed tiles, the following (b-1) to ( b-5)! To provide a method for coating roof tiles, characterized by coating a composition comprising: (b-1) Component is a polymer 100-layer lid portion containing a hydrolyzable silyl group represented by the following general formula [I, 1]. R'a -OR, -8 i -FL"B-a CI ] (b-2
) The component is a modified resin containing at least two hydroxyl groups per molecule of 0 to 400 parts. OR'a''o-5l=[l[) mu8゜(b-3) The component is 0 to 2500 parts of pigment. (b-4) The component is 0.001 to 50 parts of curing catalyst. (b-5) The components are fd agent 20 to so o ox wrinkles. The undercoat (A) contains a vinyl (co)polymer containing hydroxide M and a polyisocyanate additive. It is preferable that the undercoat (A) consists of components (b-1) to (b-5) w(b-1) according to claim 1 in %.
310 ox part, (b-2) 0 to 400 parts by weight,; b-
5) 0-2500 heavy lid part, (b-4) 9.001-5
It is better to include it in a ratio of 0 parts and (b-5) 20 to 8000 parts.Also, since component (b-1) has a number average molecular weight of 1.000 to 30,0
00 vinyl polymer is preferable. Furthermore, it is preferable that the vinyl polymer has at least one polar group selected from the group consisting of carboxyl group, carboxylic acid anhydride group, amide group, hydroxyl group, and cyano group. The compound having a trialkoxycnelyl group used in preparing the above component (b-2) is a teto-2(substituted)alkyl silicate, a known equivalent simple substance of the silicate, and/or a condensation thereof. It is good to be. It is preferable that component (b-5) contains (ffi)alkyl alcohol-A and/or hydrolyzable esterification group. Furthermore, this hydrolyzable ester compound can be a doortogi ester, an orthoacetate ester/I/, a tetra([altered)alkyl silicate alone, a known equivalent element of the silicate, or a condensation of the above-mentioned silic-)M]. It is good that it is at least one type selected from the following. Undercoat L used in the tile coating method of the present invention
As a specific example of A), °C is a non-crosslinked lacquer type vinyl (co)polymer system, a crosslinked type vesicular orolipidic modified vinyl (co)polymer system, a polymer system containing a hydrolyzable solyl group, 411 fat binders such as isocyanate-curable polymer systems containing hydroxyl groups χ can be used, but from the viewpoint of water resistance and alkali resistance, among these, polyisocyanate)Y containing hydroxyl groups as curing agents are particularly preferred. Particularly preferred are coatings based on vinyl (co)polymers and polymers containing hydrolyzable silyl radicals. Conventionally known vinyl (co)polymer coatings containing hydroxyl groups as the above-mentioned polyisocyanate)Y curing agent can be used. Specific examples of polyisocyanates used as curing agents include hexamethylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, hydrogenated products of xylylene diisocyanate, diisocyanates and trimesters such as lysine diisocyanate and inphorone diisocyanate. Adducts with polyhydric alcohols such as terolprono, glycerin, ethylene glycol and propylene glycol; picolet type polyisocyanates obtained by reacting diisocyanates such as those described above with water; and diisocyanates such as those described above) There are polyisocyanates containing an incyanuric ring obtained by trimerizing. The vinyl (co)polymer containing hydroxyl group, which is the base resin component, is a vinyl-based polymer containing hydroxyl M such as β-hydroxoethene/I/(meth)acrylate and β-hydroxyglobil (meth)acrylate. It can be synthesized by homopolymerizing the monomers or by copolymerizing them with a vinyl monomer copolymerizable with these monomers as described below. Next, as the polymer-based undercoat paint containing a hydrolyzable silyl group, a paint having a composition Y that is the same or similar to the topcoat paint of the present invention as described later can be used. The above-mentioned undercoat used in the present invention may be used as a clear paint, for example, titanium oxide. It can also be used as a colored paint by blending pigments such as carbon black, calcium carbonate, and tit (R-barium). It can also be blended with additives such as silicone-based and fluorine-based leveling agents. Next, the hydrolyzable silyl MY which is the first component forming the top coat CB) Y used in the coating method of the present invention
Polymer having <b-1) means a halosilylmethyl group, an alkoxysilylmethyy group, an acyloxysilyl group represented by the general formula [I]R"a -CH1-8i -4", -a CI) Methyl Jk, phenokinesilylmethyl group, mercaptosilylmethyl group, aminosilylmethyl group. It refers to a polymer containing a functional group that is easily hydrolyzed, such as an iminooxysilylmethyl group or an alkenyloxysilylmethyl group. Typical polymers that can be used as component (b-1) include vinyl (co)polymers, saturated or unsaturated polyesters, alkyds, urethane resins or polyethers. Among these, vinyl-based (co)polymers are particularly preferred from the viewpoint of weather resistance. In addition, the hydrolyzable solyl group, which can also be called a characteristic group, in the hydrolyzable silyl group-containing polymer, which is the component (b-1), is one of the aforementioned polyfunctional silyl groups that is undesirably volatile during curing. An alkoxysilylmethyl group is most preferable because it does not produce a component. Therefore, in order to obtain the alkoxysilylmethyl group in the vinyl (co)me pot body, ■ a vinyl monomer containing an alkoxysilylmethyl group and another vinyl monomer copolymerizable with it; Copolymerizing the mixture with the lid; ■ Using an alcoquine containing a mercapto group as a chain transfer agent to radically polymerize the vinyl monomer; Q) A separately prepared unsaturated group or epoxy group. A vinyl copolymer having a χ side chain is reacted with aminosilanes, hydrosilanes, and mercaptosilanes containing an alkoxysilylmethyl group. It is possible to apply the well-known method 7 such as, but among these, it is most convenient to use only the method (2), only the method (2), or a combination of the method (2) and the method (2). Alkoxysilylmethyl group 'k used when introducing an alkoxysilylmethyl group by the above copolymerization method (■)
Specific examples of the vinyl spinning wheel lid and body having f include γ-(meth)acryloyloxychloropyltrimethoxysilane,
r-

Examples include [meth]acryloyloxyglobyltriethoxysilane, r-(meth)acryloyloxyglobylmethoxysilane, and allyltrime-toxysilane. Specific examples of alkoxysilanes having a mercapto group (vt) used when introducing an alkoxysilylmethyl group by method (2) using a chain transfer agent include r-mercagutoglobin trimethoxy 7rane, γ
-Mercaptoglobil triethoxysilane, etc. From the viewpoint of curability and cost, the alkoxysilylmethyl group-containing monomer and/or mercapto group-containing alkoxysilane has an alkoxysilylmethyl group introduction ratio of 0.1 to 3% based on the solid content of the resin used. It is preferable to use tyr which is in the range of 1. In this way, by copolymerizing the above-mentioned alkoxysilylmethyl group-containing vinyl monomers with vinyl monomers copolymerizable with these, the hydrolyzable silyl group-containing polymer serving as the base resin component can be obtained. (b-1) is obtained. Typical examples of such copolymerizable vinyl monomers include methyl (meth)acrylate, ethyl (methane acrylate, butyl (meth)acrylate, 2-ethelhexy A/(meth)acrylate, cyclohexy/L/
(meth)acrylate, benzyl (methacrylic esters such as methane acrylate): hydroxyalkyl esters of (meth)acrylic acid such as 2-hydroxyethyl (meth)acrylate and 2-hydroxypropyl (meth)acrylate: itaconic acid , monoalkyl or dialkyl esters of dibasic acids such as fumaric acid or maleic acid; aromatic vinylated compounds such as styrene, α-methylstyrene, vinyltoluene; and also vinyl acetate, vinyl chloride-acrylonitrile, methacrylonitrile. , N,N-dialkylaminoalkyl methacrylate, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, fumaric acid, maleic anhydride, itaconic anhydride, maleic acid, N-alkoxymethyl (meth)acrylamide, acrylamide, meth Acrylamide, N
-Methysale acrylamide% (methaneacrylic acid glycidyl ester, vinyltrimethoxysilane, vinyltriethoxysilane, etc.) Among the copolymerizable vinyl monomers mentioned above, pigment dispersibility, adhesion to substrates, top coating From the viewpoint of interlayer adhesion between the coating film and the undercoat film, it is particularly preferable to copolymerize a small amount of the carboxyl group content cap, the carboxyl group, and the amide group-containing monomer. To prepare (b-1)', any known method such as solution, bulk, or suspension polymerization can be used, but the method using solution radicals is most preferred.゛Typical solvents include hydrocarbons such as toluene, xylene, cyclohexane, verhexane, and octane; methanol, ethanol% l-propanol, n-butanol, l-
Alcohols such as butanol, 5ee-phthanol, ethylene glycol monoalkyl ether; ester threads such as ethyl acetate, methyl acetate, butyl acetate or acetone, methyl ethyl ketone. There are ketone solvents such as methyl isobutyl ketone and cyclohexanone, but in order to improve the storage stability of the vinyl (co)polymer solution and the pot life of the composition of the present invention, they should be used in an amount of at least 10% by weight of the total amount of bath agent. It is preferable to use an alcohol solvent. Using such a solvent and an azo or peroxide type initiator, Jt1. All you have to do is hold a meeting. Furthermore, chain transfer agents such as lauryl mercaptan, 2-mercagutoethanol, and α-methylstyrene dimer can also be used during the reaction. Next, (b-2), which is the second component forming the paint CB) Y used in the present invention, is a compound having at least two hydroxyl groups per molecule and a trialkoxysilyl compound represented by the following general formula [1]. It is an alkoxysilane-modified resin obtained by reacting with a compound containing a group. ?゛R"0-8i -[I[]OR' Alkoxysilane modified resin (b-2)'V diethylene glycol, polyethylene glycol, propylene glycol, diglobylene glycol, polypropylene glycol, 1.4-butanediol, 1.3-butanediol%1.6-hethanediol, cyclohexane dimetatool, neopentyl glycol glycerin,
Polyhydric alcohols such as 6-methylpentane-1°3.5-triol, pentaerythritol, and sorbitol;
Saturated or unsaturated oropolyester resins, alkyd resins vinyl polymers, polybutadiene glycols, epoxy resins: and esters containing hydroxyl groups obtained by reacting the aforementioned polyhydric alcohols or various resins with ε-caprolactone. There are compounds, etc. Among the above-mentioned compounds containing hydroxyl groups, ester compounds containing hydroxyl groups obtained by adding ε-caprolactone are particularly preferred from the viewpoint of castability and adhesion of the cured resin. The 6-caprolactone adduct of such a hydroxyl group-containing compound is obtained by adding ε-caprolactone in the presence of a conventionally known catalyst at a rate of about 1 to 20 moles of ε-caprolactone per hydroxyl group at -2. preferable. Specific examples of compounds containing at least one trialkoxysilyl M represented by the above general formula [1) per molecule, which is another component used in obtaining the alkoxysilane-modified resin, include tetramethyl silicate,
Tetra (substituted) such as tetraether silicate, tetrabutyl silicate, tetra (2-methoxy ether) silicate or tetra (2-chloroether) silicate
Alkyl silicates, tetra(substituted) phenyl silicates such as tetraphenyl silicate or tetra"(4-chlorophenyl) silicate, tetraaralkyl silicates such as tetrabenzyl silicate or tetra(2-phenylethyl) silicate; tetraethersilicate fist dimer Condensates of various monomers such as the above-mentioned tetra(substituted) alkyl silicates such as tetraethylsilicate tetramer or tetraethylsilicate hexamer;
Vinyltrimethoxysilane, vinyltriethoxysilane or glycidoxyglobiltrimethoxysilane, γ
- 7 run coupling agents such as methacryloyl oxypropyltrimethoxysilane or 6-(β-aminoethyl)aminopropyltrimethoxy 77 run; trimethoxysilane, triethoxysilane, methyltrimethoxy 77 run;
Compounds having one or more allyl groups per molecule such as allyl acetate, allyl benzoate, diallyl phthalate, diallyl adipate, diallyl succinate or triallyl trimellitate; Adducts with hydrosilane/silane such as trimethoxysilane or triethoxysilane: Furthermore, vinyl threads containing alkoxysilyl groups in the side chain (co-)tocombinants, etc. are also used, and even when used alone, two or more of these can be used. Among these, it is preferable to use tetraalkyl silicates such as tetramethylsilicate, tetraethylsilicate, or tetrabutylsilicate, or condensates Z such as tetraethersilicate dimer, -trimer, or -tetramer. Especially desirable in terms of price, etc. In order to obtain the component (b-2) by condensing the two components described above, a method such as that described in JP-A-58-173158 may be used, for example. Next, as the third component of the pigment CB)', any conventionally known pigment can be used. Examples include inorganic pigments such as aluminum powder, titanium oxide, calcium carbonate, barium sulfate, carbon black lead circles, and yellow lead, and organic pigments such as azo pigments, phthalocyanine pigments, and quinacridone pigments. The curing catalyst, which is the fourth component of paint CB)Y, is as follows:
It is preferable to add a conventionally known catalyst for hydrolysis and condensation of silyl group-containing compounds. Typical examples of such curing catalysts include butylamine, diptylamine, hexylamine, t-butylamine, ethylenediamine, triethylamine, inphoronediamine, imidazole, lithium hydroxide, sodium hydroxide, potassium hydroxide, and sodium methylate. Basic compounds; tetraisoglobiltetanate, tetrabutyl titanate, tin octylate, lead octylate, cobalt octylate, zinc octylate, calcium octylate,
Metal-containing compounds such as lead naphthenate, cobalt naphthenate, dibutyltin diacetate, dibutyltin dioctoate, diptyltin dilaurate, diptyltin malate; p-
Examples include acidic compounds such as toluenesulfonic acid, trichloroacetic acid, phosphoric acid, monoalkyl phosphoric acid, dialkyl phosphoric acid, phosphate ester of β-hydroxyethyl acrylate, sonoalkyl phosphorous acid, and dialkyl phosphorous acid. but especially dibutyltin diacetate, diptyltin dioctoate, dibutyltin silacrate. Tin compounds such as diptyltin malate are suitable for R-f. Examples of the solvent as the fifth component constituting the paint (B) include, in addition to those mentioned above, trialkyl orthoformates such as orthotrimethyl, triethyl orthoformate, trimethyl orthoacetate, triethyl orthoacetate, etc. ortho-acid trialkyl M such as, tetra (substituted) as described above.
Alkyl silica) (7) Although there are convenience factors, it is preferable to use an alcohol-based MIJ and/or a hydrolyzable ester compound as described above in order to extend the pot life of the paint (B). . The paint (B) used in the present invention can be obtained by mixing the components (b-1) to (b-5) described above, but the usage ratio &X (b-1) component per 100 weight tsK (b
-2) Ingredients 0~. 400 copies, (b-5) M minutes 0-2
500 parts by weight, (b-4) component 0.001 to 50 parts by weight, and (b-5) component 20 to 80001 parts by weight. The paint of the present invention can be used either as a clear paint or as a colored paint by adding pigments. In addition, although a coating film with sufficient durability can be obtained without using component (b-2), crack resistance can be greatly improved by adding component (b-2). . In order to improve the appearance of the coating film, a silicone-based, fluorine-based, or other leveling agent may be added to the top coat CB) obtained in this way, if necessary. As mentioned above, the composition used as the top coat is
It can be used as the undercoating paint of the present invention as it is, or with different blending ratios, types of pigments, etc. To paint tiles using undercoat paint (A) and topcoat paint (B) Spray apply and dry at room temperature for 2 to 7 days or force dry at 60 to 150℃ for 1 to 30 minutes. After forced drying, apply a top coat and dry at room temperature for 2 to 7 days or at 60 to 150℃ for 1 to 30 minutes.
All you have to do is force dry it for about 30 minutes. Next, the present invention will be specifically explained using Reference Examples, Examples, and Comparative Examples, but unless otherwise specified hereinafter, the terms and conditions apply. Reference Example 1 (Example of Preparation of Hydrolyzable Silyl Group-Containing Polymer) 400 parts of toluene and 400 parts of n-butanol were charged into a reactor equipped with a stirring device, a thermometer, a nitrogen inlet tube, and a reflux condenser tube. The temperature was raised to 105°C under atmosphere. Next. At the same temperature, 200 parts of styrene, 60 parts of methyl methacrylate
0 parts, n-butyl methacrylate 220 parts, n-butyl acrylate 195 parts, r-methacryloyloxyglobyltrimethoxysilane 70 parts, motuptil maleate 15 parts, toluene 200 parts, azobisisobutyronitrile 6 parts. A mixture consisting of 10 parts of t-butylperoxyoctoate and 5 parts of t-butylperoxybenzoate was added dropwise over 3 hours. Thereafter, the temperature was raised to 110°C and maintained at the same temperature for 15 hours to obtain a solution of a vinyl polymer containing trimethoxysilyl groups with a nonvolatile content of 50% and a number average molecular weight of [9,000]. Hereinafter, this will be abbreviated as b-1-1. Reference Example 2 (Same as above) As monomer components to be copolymerized, 200 parts of styrene, 590 parts of methyl methacrylate, 230 parts of n-butyl acrylate, 130 parts of r-methacryloxyglobyltrimethoxysilane, and β-hydroxy A solution of a vinyl polymer containing trimethoxysilylmethyl groups with a nonvolatile content of 50% and a number average molecular weight of -.9,000 was obtained in the same manner as in Reference Example 1 except that 50 parts of globil methacrylate was used. Hereinafter, this will be abbreviated as b-1-2. Reference Example 3 (Same as above) 400 parts of toluene and n
- 300 parts of butanol was charged and the temperature was raised to 105°C. Next, 200 parts of styrene, 300 parts of methyl methacrylate
200 parts of n-butyl methacrylate, 90 parts of n-butyl acrylate, 200 parts of r-methacryloyloxyglobyltrimethoxysilane, 200 parts of toluene, 6 parts of azobisisobutyronitrile, t-butylperoxyoctoate A mixture of 30 parts and 5 parts of t-butylperoxybenzoate and a mixture of 100 parts of n-butanol and 10 parts of acrylamide were added dropwise over 4 hours. Thereafter, the temperature was raised to 110° C. and maintained at the same temperature for 15 hours to obtain a bath liquid of a vinyl polymer containing trimethoxysilylmethyl groups with a number average molecular weight of taooo and a nonvolatile content of 50%. Hereinafter, this will be abbreviated as b-1-3. Reference Example 4 (Synthesis example of polyisocyanate-curable acrylic polyol) 400 parts of toluene and 400 parts of butyl acetate are used as the solvent initially charged in the reactor, and 200 parts of styrene and 100 parts of methyl methacrylate are used as monomers to be copolymerized.
50% non-volatile content, molecular weight A solution of acrylic polyol of z000 was obtained. Hereinafter, this will be abbreviated as C. Reference Example 5 (Synthesis example of alkoxysilane-modified resin) Trimethylolpropane 1349 (1 mol →, 6-
Addition of 684 parts (6 mol) of caprolactone and 0.04 tf (tetraptertethane) (S) and reaction at 180"C in a nitrogen atmosphere for 6 hours to give a molar ratio of trimethylolpropane-ε-caprolactone of 1=6. After the temperature was lowered to 90'C, 936 parts of tetraethersilicate (equivalent ratio of tetraethersilicate to hydroxyl group = i, 5) and 5.3 parts of tetrabutyl titanate were added to give a mixture of 110 to 120 parts. The reaction was carried out at C until the distillation of ethanol stopped (3 hours) to obtain a tetraethoxysilane modified resin. Hereinafter, this will be abbreviated as b-2-1. 9 Example 6 (same as above) In Reference Example 5 818 parts of the obtained trimethylpropane-e-caprolactone adduct with a molar ratio of 1=6, [
Ethersilicate 404 (Made by Colcote ■, mixture of 4 parts and 1 part of ethersilicate, 5 parts and 6 parts) 2,
250 parts of tetrabutyl titanate and 9.29 parts of tetrabutyl titanate. The mixture was heated at a temperature of 100 to 135° C. for 2 hours, and the produced ethanol was distilled off to obtain a resin modified with a tetraethoxysilane combination. Hereinafter, this will be abbreviated as b-2-2. Examples 1 to 6 Each component was mixed in the ratio shown in Table 1 to prepare an acrylic resin-polyisocyanate-based undercoat containing a hydroxyl group or a vinyl polymer-based undercoat containing a hydrolyzable silyl group. After spray painting on a predetermined base material, the mixture was left at room temperature for 1 hour to obtain an undercoat film. Then,
A top coat was prepared by mixing each component in the proportions shown in Table 1, and was spray coated on the base coat described above for 70 minutes at room temperature.
The performance of the cured coating film obtained by drying for several days was evaluated and shown in Table 1. Comparative Examples 1 to 2 A conventional acrylic-urethane paint made by mixing each component in the ratio shown in Table 1 was spray-painted on a slate tile in the same manner as in the example, and dried to improve the performance of the curing chamber film. evaluated. The coating film performance of conventional glazed roof tiles was also evaluated, and as is clear from Table 1, the coating film obtained by the coating method of the present invention was extremely durable. (Note 1) All numerical values represent parts by weight, and vinyl polymers b-1-1 to b-1-5, acrylic polyol C and Burnock 1) N-950 represent parts by weight of the solution. (Note 2) Acrylic polyol manufactured by Dainippon Ink & Chemicals ■, hydroxyl value 50, non-volatile content 50%. (Note 3) Polyisocyanate resin manufactured by Dainippon Ink & Chemicals, isocyanate group content 12.5%, non-volatile content 7
5%. (Note 4) Rutile type titanium oxide made by Ishiya Sangyo ■ (Note 5)! Composition: xylene/toluene/butyl acetate/cellosolve acetate) = 30/30/l/10 (weight ratio) (Note 6) Composition:
Xylene/toluene/n-butanol/methyl orthoformate/cellosolve acetate = 30/20/30/10/10 (weight ratio) (Note 7
) Flake aluminum paste manufactured by Toyo Aluminum ■, aluminum content 65%. (Note 8) I composition: xylene/toluene/n-7'tanol/ethyl silicate 40/cellosolve acetate = 3
0/20/3015/15 (weight ratio) (Note 9) Composition:
xylene/toluene/n-butanol/tetraethersilicate/methyl orthoformate/cellosolve acetate=
50/15/3015/10/10 (weight ratio) (Note 10) A cut line was made on the coated surface, and the cut line was peeled off with cellophane tape, and the adhesion state between the undercoat film and the base material was visually evaluated. (Note 11) The adhesion state of the top coat film and undercoat film when tested in the same manner as (Note 10) was visually judged. (Note 12) One test cycle is immersion in water at 20°C for 18 hours, then holding in a -20°C low temperature tank for 6 hours, and then holding in a 50°C @ groove tank for 3 hours. The number of cycles until (Note 13) The appearance of the coating film was visually evaluated when exposed to the Miyazaki series for one year. Agent: Patent attorney Katsutoshi Takahashi

Claims (1)

[Claims] 1. When painting tiles selected from the group consisting of slate tiles, cement tiles, and unglazed tiles, two lower coats of paint (
After painting A), apply the following (b-
1) A method for coating roof tiles comprising coating a composition comprising (b-5). (b-1) 100 parts by weight of a polymer containing a hydrolyzable silyl group represented by the following general formula [D R''a 凰-OH, -8i-R%-a [I] (b-2) 1 molecule An alkoxysilane modified resin obtained by reacting a compound containing at least two water rR groups with a compound containing a trialkoxysilyl group represented by the following general formula [■]. ?R'R"O~st-[II)01'Ll' (b-3) Pigment 0~25003i (fs. (b-4) Curing catalyst 0.001~50 heavy lid part. (b-s) Solvent 20 to aooo weight 1 is02 The method for coating tiles according to claim 1, characterized in that the undercoat (A) comprises a vinyl (co)polymer containing a hydroxyl group and a polyisocyanate compound. & The undercoat (A) is (
The method for coating roof tiles according to claim 1, which comprises components b-1) to (b-5) in the following ratios. (b-1) 100 parts by weight (b-2) 0 to 400 parts by weight (b-3) 0 to 2500 parts by weight (b-4) 0.001 to 50 parts by weight (b-5) 20 to 8000 parts by weight Part 4, component (b-1) has a number average molecular cap 1. OOO~30
,000, which is a vinyl polymer.
How to paint tiles described in fJ4-6th man. & Vinyl polymer has carboxyl group as polar group,
5. The method for coating roof tiles according to claim 4, which comprises at least one type of group selected from the group consisting of a carboxylic anhydride group, an amide group, a hydroxyl group, and a cyano group. 6. (b-2) The trialkoxysilyl group-containing compound used in preparing μ is a single tetra(substituted) alkyl silicate, an equivalent single unit of the silicate, and/or a fusion thereof. A method for coating roof tiles according to claims 1 and 3, characterized in that: 7. The method for coating tiles according to claim wJ1JJ4 and claim 6, wherein the component (b-5) contains a (substituted) alkyl alcohol and/or a hydrolyzable ester compound. 8. The hydrolyzable ester compound is at least one selected from the group consisting of orthoacetic esters, orthoacetic acid esters A/types, tetra(substituted) alkyl silicates alone, the silica 1mO equivalent alone, or condensates of the above-mentioned clicates. 8. A method for painting tiles according to claim 7, characterized in that: