Covering material

Abstract

To provide a covering material having excellent adhesion to various base and top coating materials.SOLUTION: A covering material is composed of a resin component (A), an aliphatic hydrocarbon-containing nonaqueous solvent (B), a polyisocyanate compound (C), and an organic amine compound (D). The resin component (A) includes a non-water-dispersible resin (A-1) and a soluble resin (A-2). The non-water-dispersible resin (A-1) and / or the soluble resin (A-2) has a hydroxy group.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a novel coating material.

Background Art

[0002] Conventionally, as base materials constituting buildings, civil engineering structures, etc., inorganic base materials such as concrete, mortar, slate boards, calcium silicate boards, siding boards, etc. are often used. When applying paint to these surfaces, a primer is usually applied to ensure adhesion and further prevent swelling, peeling, lifting, etc. of the coating film over time. Also, when repairing an old coating film surface, especially when repairing a coating film having functions such as high weather resistance and stain resistance provided on exterior building materials, a primer is similarly required. For this reason, there is a demand for a primer having good adhesion to various base materials and substrates such as coating films.

[0003] Such primers are mainly classified into solvent-based primers and water-based primers, but solvent-based primers are often used from the viewpoint of adhesion. Among them, in recent years, in consideration of safety during painting, work hygiene, etc., or environmental problems, for example, weak solvent-based primers using aliphatic hydrocarbon solvents as the main solvent as in Patent Document 1 are widely used.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] On the other hand, as described above, in consideration of environmental problems, etc., weak solvent-based topcoats and water-based topcoats are often used as topcoats. However, depending on the coating conditions of weak solvent-based primers and topcoats, it may be difficult to ensure sufficient adhesion, and there has been room for improvement.

[0006] The present invention has been made in view of these points, and aims to provide a coating material that has excellent adhesion and can be suitably used as a weak solvent-type primer. [Means for solving the problem]

[0007] To solve these problems, the inventors, after diligent research, conceived of a coating material that uses a combination of a non-aqueous dispersion resin and a soluble resin as resin components, and further incorporates a specific compound as an essential component, thereby completing the present invention.

[0008] In other words, the present invention has the following features. 1. The constituent components include a resin component (A), an aliphatic hydrocarbon-containing non-aqueous solvent (B), a polyisocyanate compound (C), and an organic amine compound (D). The above resin component (A) includes a non-aqueous dispersion resin (A-1) and a soluble resin (A-2). The above non-aqueous dispersion resin (A-1) and / or the above soluble resin (A-2) have hydroxyl groups, The above organic amine compound (D) includes at least one compound selected from the group consisting of urea compounds, hydrazides, pyrrolidine, piperidine, morpholine, and dicyandiamide. It must be a weak solvent-based primer. A covering material characterized by the following. 2. Contains extender pigments as constituent components, The coating material according to claim 1, characterized in that it contains 50 to 600 parts by weight of the extender pigment per 100 parts by weight of the solid content of the resin component (A) above. 3. The coating material according to 1., characterized in that the solid content weight ratio [(A-1) / (A-2)] of the non-aqueous dispersion resin (A-1) and the soluble resin (A-2) is 2 / 98 to 80 / 20. [Effects of the Invention]

[0009] The coating material of the present invention exhibits excellent performance in terms of adhesion. [Modes for carrying out the invention]

[0010] The following describes embodiments for carrying out the present invention.

[0011] The coating material of the present invention comprises a resin component (A), an aliphatic hydrocarbon-containing non-aqueous solvent (B), a polyisocyanate compound (C), and an organic amine compound (D) as constituent components.

[0012] The coating material of the present invention is characterized by comprising a non-aqueous dispersion resin (A-1) and a soluble resin (A-2) as resin component (A) (hereinafter also referred to as "component (A)"). In the present invention, the combined use of non-aqueous dispersion resin (A-1) and soluble resin (A-2) contributes to improved adhesion and other benefits.

[0013] The non-aqueous dispersible resin (A-1) (hereinafter also referred to as "component (A-1)") is a resin that can be dispersed in an aliphatic hydrocarbon-containing non-aqueous solvent (B). Specifically, it has both a resin portion that is soluble in the aliphatic hydrocarbon-containing non-aqueous solvent (B) and a resin portion that is not soluble, and is dispersed in the non-aqueous solvent (B) in the form of resin particles. Component (A-1) can be obtained, for example, by polymerizing various vinyl monomers by a conventional method in the presence of a resin soluble in the non-aqueous solvent (B). The weight-average molecular weight of component (A-1) is preferably 10,000 to 500,000 (more preferably 20,000 to 300,000). The glass transition temperature of component (A-1) is preferably -5°C to 70°C (more preferably 10°C to 60°C). The glass transition temperature is a value that can be determined by Fox's formula based on the vinyl monomers constituting the resin. Furthermore, in this invention, "a to b" is synonymous with "a or more and b or less".

[0014] The soluble resin (A-2) is a resin that can be dissolved in an aliphatic hydrocarbon-containing non-aqueous solvent (B). Component (A-2) can be obtained, for example, by polymerizing various vinyl monomers in the non-aqueous solvent (B) by a conventional method. The weight-average molecular weight of component (A-2) is preferably 2,000 to 300,000 (more preferably 10,000 to 250,000, even more preferably 30,000 to 220,000, and particularly preferably 50,000 to 200,000) from the viewpoint of suitability for overcoating, workability and finish during painting, and durability of the coating film. The glass transition temperature of component (A-2) is preferably -5°C to 70°C (more preferably 10°C to 60°C).

[0015] The solid content weight ratio of component (A-1) to component (A-2) [(A-1) component / (A-2) component] is preferably 2 / 98 to 80 / 20 (more preferably 3 / 97 to 60 / 40, even more preferably 4 / 96 to 45 / 55, and particularly preferably 5 / 95 to 40 / 60). Within this range, the effects of the present invention can be enhanced. In particular, it is advantageous in terms of adhesion in low-temperature environments.

[0016] In component (A) of the present invention, it is preferable that at least component (A-1) of component (A-1) has an oxidative polymerizable group (it is an oxidative polymerization type resin), and more preferably that both component (A-1) and component (A-2) have an oxidative polymerizable group. As a result, component (A) is oxidized and cured by air oxidation via oxidative polymerizable double bonds (oxidative polymerizable groups). This improves curability and adhesion. To impart oxidative polymerizable groups to component (A-1) and / or component (A-2), for example, resins such as those shown below may be used.

[0017] 1) A resin obtained by copolymerizing a vinyl monomer having an oxidative polymerizable group with another vinyl monomer copolymerizable with this monomer. 2) A resin obtained by copolymerizing an epoxy group-containing vinyl monomer with another vinyl monomer copolymerizable with this monomer, and then adding an unsaturated fatty acid to the epoxy group-containing vinyl monomer. 3) A resin obtained by copolymerizing and / or graft-polymerizing a vinyl monomer having an oxidative polymerizable group and / or another vinyl monomer copolymerizable with this monomer with an alkyd resin.

[0018] Examples of the vinyl monomer having an oxidative polymerizable group in the above 1) and 3) include vinyl monomers obtained by adding an unsaturated fatty acid to an epoxy group-containing vinyl monomer. This vinyl monomer is obtained by the reaction of an epoxy group and a carboxyl group in an unsaturated fatty acid. Further, the resin of the above 2) is obtained by the addition reaction of an unsaturated fatty acid to an epoxy group in the resin. When reacting an epoxy group and an unsaturated fatty acid, a catalyst such as a tertiary amine or a quaternary ammonium salt can be used.

[0019] Specific examples of the epoxy group-containing vinyl monomer include glycidyl (meth)acrylate, β-methylglycidyl (meth)acrylate, 3,4-oxycyclohexylpropyl (meth)acrylate, allyl glycidyl ether, and the like. These can be used alone or in combination of two or more.

[0020] Examples of the unsaturated fatty acid include linseed oil fatty acid, tung oil fatty acid, fish oil fatty acid, dehydrated castor oil fatty acid, soybean oil fatty acid, sesame oil fatty acid, poppy oil fatty acid, eno oil fatty acid, safflower oil fatty acid, hemp seed oil fatty acid, grape seed oil fatty acid, tall oil fatty acid, sunflower oil fatty acid, cottonseed oil fatty acid, corn oil fatty acid, walnut oil fatty acid, and the like. These can be used alone or in combination of two or more. The composition ratio of the unsaturated fatty acid in the (A-1) component and the (A-2) component is preferably 0.1 to 40% by weight, more preferably 0.2 to 35% by weight, based on the resin solid content of the (A-1) component or the (A-2) component, from the viewpoints of adhesion and various coating film physical properties.

[0021] As vinyl monomers having oxidative polymerizable groups in 1) and 3) above, for example, vinyl monomers containing dicyclopentadieneoxyalkyl groups such as dicyclopentadieneoxyalkyl(meth)acrylate and vinyl monomers containing allyl groups such as allyl(meth)acrylate can also be used. These can be used individually or in combination of two or more.

[0022] As the alkyd resin in 3) above, a resin obtained by polycondensing a polyhydric alcohol and a polyhydric carboxylic acid and modifying it with a drying oil, unsaturated fatty acid, etc., can be used. Examples of polyhydric alcohols include ethylene glycol, glycerin, and pentaerythritol, and examples of polyhydric carboxylic acids include phthalic anhydride and maleic anhydride. Examples of drying oils include linseed oil, tung oil, safflower oil, etc. From the viewpoint of adhesion and various coating film properties, the alkyd resin modification rate in component (A-1) and component (A-2) is preferably 0.1 to 40% by weight, more preferably 0.2 to 35% by weight, based on the resin solid content of component (A-1) or component (A-2).

[0023] Other vinyl monomers mentioned in 1) to 3) above include, for example, alkyl (meth)acrylates and aromatic monomers. Specific examples of alkyl (meth)acrylates include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, n-amyl (meth)acrylate, isoamyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, octadecyl (meth)acrylate, and cyclohexyl (meth)acrylate. Specific examples of aromatic monomers include, for example, styrene, 2-methylstyrene, vinyltoluene, t-butylstyrene, chlorostyrene, vinylanisole, vinylnaphthalene, and divinylbenzene. These can be used individually or in combination of two or more. Examples of such vinyl monomers include carboxyl group-containing vinyl monomers, amino group-containing vinyl monomers, and hydroxyl group-containing vinyl monomers. As for component (A), other monomers that are copolymerized with at least an alkyl (meth)acrylate, or a copolymer of an alkyl (meth)acrylate and an aromatic monomer are preferred.

[0024] The present invention is characterized in that component (A-1) and / or component (A-2) have a hydroxyl value. This enhances the effects of the present invention. The hydroxyl value of component (A-1) and / or component (A-2) is preferably 1 to 150 mg KOH / g (more preferably 5 to 100 mg KOH / g, and even more preferably 10 to 80 mg KOH / g) based on the resin solids content of component (A-1) or component (A-2). Within this range, curability (initial drying time) is increased, and adhesion can be further enhanced. In the present invention, it is preferable that at least component (A-1) has the above hydroxyl value. Note that the hydroxyl value is a value expressed by the number of mg of potassium hydroxide equivalent to the hydroxyl groups contained in 1 g of resin solids.

[0025] (A) In order to set the hydroxyl value in component (A) within the above range, other vinyl monomers in 1) to 3) above may be used, for example, hydroxyl group-containing vinyl monomers. Examples of the above hydroxyl group-containing vinyl monomers include hydroxyalkyl esters of (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. These can be used individually or in combination of two or more.

[0026] Furthermore, it is preferable that component (A-1) and / or component (A-2) have an acid value. This can enhance the effects of the present invention. The acid value of the resin component is preferably 0.1 to 30 mg KOH / g (more preferably 0.3 to 20 mg KOH / g), based on the resin solid content of component (A-1) or component (A-2). Within this range, curability (initial drying properties) can be increased, and adhesion can be further enhanced. In the present invention, it is desirable that both component (A-1) and component (A-2) each have the above acid value. The acid value is a value expressed by the number of mg of potassium hydroxide equivalent to the number of acid groups contained in 1 g of resin solid content.

[0027] (A) To set the acid value in component (A) within the above range, other vinyl monomers as in (1) to (3) above may be used, for example, carboxyl group-containing vinyl monomers. Examples of carboxyl group-containing vinyl monomers include acrylic acid, methacrylic acid, crotonic acid, maleic acid or its monoalkyl ester, itaconic acid or its monoalkyl ester, fumaric acid or its monoalkyl ester, ω-carboxy-polybutyrolactone mono(meth)acrylate, ω-carboxy-polyvalerolactone mono(meth)acrylate, ω-carboxy-polycaprolactone mono(meth)acrylate, ω-carboxy-polycapryloractone mono(meth)acrylate, ω-carboxy-polylaurylolactone mono(meth)acrylate, (meth)acrylate dimer, (meth)acrylate trimer, (meth)acrylate tetramer, (meth)acrylate heptamer, (meth)acrylate hexamer, etc. These can be used individually or in combination of two or more.

[0028] Furthermore, it is preferable that component (A-1) and / or component (A-2) have an amine value. The amine value of component (A-1) and / or component (A-2) is preferably 0.1 mg KOH / g or more (more preferably 0.3 to 10 mg KOH / g), based on the resin solids content of component (A-1) or component (A-2).

[0029] (A) To set the amine value in component (A) within the above range, other vinyl monomers as described in 1) to 3) above may be used, such as an amino group-containing vinyl monomer or a hydroxyl group-containing vinyl monomer. Examples of the above amino group-containing vinyl monomers include N-methylaminoethyl(noethyl(meth)acrylate, dimethylaminoethyl vinyl ether, N-(2-dimethylaminoethyl)acrylamide, and N-(2-dimethylaminoethyl)methacrylamide. These can be used individually or in combination of two or more.

[0030] The above-mentioned aliphatic hydrocarbon-containing non-aqueous solvent (B) (hereinafter also referred to as "component (B)") is a non-aqueous solvent that has lower toxicity than toluene, xylene, etc., offers higher safety in the workplace, and has less impact on air pollution. Examples of aliphatic hydrocarbons include n-hexane, n-pentane, n-octane, n-nonane, n-decane, n-undecane, and n-dodecane. These can be used individually or in combination of two or more. In this invention, aliphatic hydrocarbons can also be introduced by using a mixed solvent such as mineral spirits. It is preferable that the aliphatic hydrocarbons are present in an amount of 5% by weight or more (more preferably 10-80% by weight) of the total amount of component (B).

[0031] Component (B) may contain a solvent that is miscible with aliphatic hydrocarbons. Examples of such solvents include petroleum-based solvents such as petroleum ether, petroleum naphtha, and solvent naphtha, as well as ethyl acetate, butyl acetate, methyl ethyl ketone, and methyl isobutyl ketone. Suitable solvents include, for example, petroleum-based solvents (petroleum mixed solvents containing aromatic hydrocarbons) with a mixed aniline point or aniline point of 12 to 70°C. The mixed aniline point or aniline point is a value measured by the method of JIS K2256:2013.

[0032] The mixing ratio of component (B) is preferably 100 to 500 parts by weight, more preferably 120 to 400 parts by weight, per 100 parts by weight of the solid content of component (A). Component (B) also includes the solvent used as a medium for each component.

[0033] The above polyisocyanate compound (C) (hereinafter also referred to as "component (C)") has two or more isocyanate groups in one molecule and reacts with the hydroxyl group of component (A). Component (C) is preferably one that can react with component (C) at room temperature. Here, "room temperature" refers preferably to a temperature between -10°C and 50°C, more preferably between 5°C and 40°C.

[0034] (C) Component(s) include at least one diisocyanate selected from aliphatic diisocyanates and alicyclic diisocyanates, and alcohol components, and optionally polyol components, which are derivatized by alfanation, biuretation, dimerization (uretidioneation), trimerization (isocyanurateation), adductation, carbodiimideation, etc., and mixtures thereof. These can be used individually or in combination of two or more.

[0035] Aliphatic diisocyanates are compounds that have a saturated aliphatic group in their molecule, such as 1,4-diisocyanatobutane, 1,5-diisocyanatopentane, 1,6-diisocyanatohexane (also known as hexamethylene diisocyanate (HDI)), 1,6-diisocyanato-2,2,4-trimethylhexane, and methyl 2,6-diisocyanatohexanoate (lysine diisocyanate). On the other hand, alicyclic diisocyanates are compounds that have a cyclic aliphatic group in their molecule, such as 5-isocyanato-1-isocyanatomethyl-1,3,3-trimethylcyclohexane (isophorone diisocyanate), 1,3-bis(isocyanatomethyl)cyclohexane (hydrogenated xylylene diisocyanate), bis(4-isocyanatocyclohexyl)methane (hydrogenated diphenylmethane diisocyanate), and 1,4-diisocyanatocyclohexane. Among these, HDI is the most preferred due to its excellent weather resistance and flexibility.

[0036] Examples of alcohol components include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutanol, 1-pentanol, 2-pentanol, isoamyl alcohol, 1-hexanol, 2-hexanol, 1-heptanol, 1-octanol, 2-ethyl-1-hexanol, 3,3,5-trimethyl-1-hexanol, tridecanol, pentadecanol, palmityl alcohol, stearyl alcohol, cyclopentanol, cyclohexanol, methylcyclohexanol, and trimethylcyclohexanol. These can be used individually or in combination of two or more.

[0037] Examples of polyol components include polyether polyols, polyester polyols, and polyolefin polyols. In the present invention, polyether polyols such as polypropylene triol, polypropylene glycol, and polytetramethylene glycol are particularly preferred. These can be used individually or in combination of two or more.

[0038] The amount of component (C) is preferably 0.01 to 0.5 (more preferably 0.05 to 0.3) in molar ratio [NCO] / [OH] between the isocyanate group of component (C) and the hydroxyl group of component (A). This range ensures excellent storage stability and sufficient adhesion. In particular, it exhibits excellent adhesion to the substrate.

[0039] Furthermore, it is preferable that component (C) contains a polyisocyanate compound having an isocyanate group content of 10% by weight or more (more preferably 15% by weight or more and 30% by weight or less) in the solid content. This allows for sufficient adhesion and enhances water resistance, which is effective in suppressing blistering of the coating. In this invention, the isocyanate group content is defined as the content (by weight) of isocyanate groups contained in the solid content of the polyisocyanate compound, and is a value obtained by back titration with hydrochloric acid after neutralizing the isocyanate groups with an excess amine.

[0040] The above-mentioned organic amine compound (D) (hereinafter also referred to as "component (D)") is a component that acts as an adhesion improver to the substrate and the topcoat material. In the coating material of the present invention containing components (A-1), (A-2), (B), and (C) above, the inclusion of component (D) provides stable adhesion to the substrate and the topcoat material, and is particularly effective in improving adhesion to the topcoat material, exhibiting excellent adhesion even when the topcoat material is a water-based coating material.

[0041] Examples of component (D) include urea compounds such as urea, thiourea, methylurea, ethylurea, dimethylurea, diethylurea, ethyleneurea, guanylurea, guanylthiourea, azodicarbonamide, glycolylurea, and acetylurea; hydrazides such as hydrazine, isopropylhydrazine, butylhydrazine, benzylhydrazine, phenylhydrazine, hydrabenzene, methylcarbazate, propionic acid hydrazide, carbohydrazide, adipic acid dihydrazide, dodecanedihydrazide, thiocarbohydrazide, isophthalic acid dihydrazide, and 4,4'-oxybisbenzenesulfonylhydrazine; and pyrrolidine, piperidine, morpholine, and dicyandiamide. These can be used individually or in combination of two or more. This enhances the effects of the present invention without inhibiting the curing of component (A) above.

[0042] In the present invention, it is preferable that component (D) contains a urea compound (particularly ethylene urea). This provides stable adhesion to the substrate and the topcoat, and is particularly effective in improving adhesion to the topcoat, exhibiting even better adhesion even when the topcoat is a water-based coating material.

[0043] Furthermore, it is preferable to use component (D) of the present invention dissolved in a solvent. The solvent is not particularly limited and any known polar solvent can be used as long as it can dissolve component (D), but in the present invention, alcohol-based solvents such as ethanol and methanol are preferred. This makes it possible to uniformly disperse component (D) in the coating material, thereby enhancing the effects of the present invention.

[0044] The amount of component (D) is preferably 0.05 to 10 parts by weight (more preferably 0.1 to 5 parts by weight) per 100 parts by weight of the solid content of component (A). By keeping it within this range, Sufficient adhesion can be achieved. In particular, it exhibits excellent performance in terms of adhesion to topcoat materials.

[0045] The coating material of the present invention preferably contains, in addition to the above components, a coloring pigment (E) and / or an extender pigment (F).

[0046] As the coloring pigment (E) (hereinafter also referred to as "component (E)"), chromatic pigments, white pigments, black pigments, etc., can be used. Of these, chromatic pigments are pigments that exhibit chromatic colors such as yellow, orange, red, green, blue, and purple. Examples of such chromatic pigments include inorganic ones such as ferric oxide, hydrated ferric oxide, ultramarine, cobalt blue, and cobalt green, and organic ones such as azo, naphthol, pyrazolone, anthraquinone, perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, and quinophthalone. On the other hand, white pigments are pigments that exhibit white color, and examples include titanium dioxide, zinc oxide, and aluminum oxide. Black pigments are pigments that exhibit a black color, and examples include inorganic substances such as iron black, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, and copper-manganese-chromium composite oxide, as well as carbon black. These can be used individually or in combination of two or more. They may also have some kind of surface treatment. The average particle size of component (E) is preferably 1 μm or less, more preferably 0.01 to 0.9 μm.

[0047] The amount of component (E) is preferably 5 to 100 parts by weight (more preferably 10 to 80 parts by weight) per 100 parts by weight of the solid content of component (A). With component (E) in this ratio, the coating material can be colored to the desired color, improving its opacity, aesthetics, etc.

[0048] The extender pigment (F) (hereinafter also referred to as "component (F)") contributes, for example, to homogenizing the substrate surface and improving adhesion between the substrate and the topcoat. Specifically, it repairs roughness and cracks on the substrate surface caused by deterioration, flattens the surface, and homogenizes the appearance by adjusting the overall color tone. Furthermore, the anchoring effect caused by the fine irregularities derived from component (F) can suppress the occurrence of defects such as blistering, cracking, and peeling in the topcoat. The reason for these effects is not clear, but it is presumed that component (F) is effective in increasing the solid content ratio of the coating material, imparting appropriate viscosity, and improving film strength.

[0049] Examples of component (F) include heavy calcium carbonate, light calcium carbonate, kaolin, clay, pottery clay, china clay, diatomaceous earth, hydrated fine silica, talc, barite powder, barium sulfate, precipitated barium sulfate, barium carbonate, magnesium carbonate, silica powder, aluminum hydroxide, etc. These can be used individually or in combination of two or more. The average particle size of component (F) is preferably 0.1 to 100 μm (preferably 1 to 80 μm).

[0050] The amount of component (F) is preferably 50 to 600 parts by weight (more preferably 60 to 500 parts by weight, and even more preferably 100 to 450 parts by weight) per 100 parts by weight of the solid content of component (A). Within this range, the above effects can be fully exhibited, and sufficient adhesion to the substrate and the topcoat (especially the topcoat) can be obtained.

[0051] In the present invention, component (E) and / or component (F) are blended such that the pigment volume concentration (PVC) (hereinafter also referred to as "PVC") in the formed coating film is preferably 30 to 80% (more preferably 35 to 65%). With such a pigment volume concentration (PVC), a coating film with sufficient adhesion can be formed.

[0052] In addition to the above components, the coating material of the present invention further includes an organometallic compound (G) (hereinafter also referred to as "component (G)") which acts as a curing catalyst or curing accelerator for component (A). As component (G), for example, organometallic compounds containing metals such as cobalt, manganese, vanadium, cerium, iron, tin, zirconium, bismuth, aluminum, strontium, titanium, zinc, barium, copper, calcium, lead, and nickel (for example, metal organic acid salt compounds, metal chelate compounds, metal alkoxide compounds, metal acylate compounds, etc.) can be used. Specifically, component (G) includes, for example, cobalt octylate, cobalt naphthenate, manganese octylate, manganese naphthenate, iron octylate, iron naphthenate, tin octylate, tin naphthenate, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dioctiate, zirconium octylate, zirconium naphthenate, zirconium tetrakis(acetylacetonate), zirconium bis(butoxy)bis(acetylacetonate), zirconium ethoxide, zirconium n-propoxide, zirconium n-butoxide, aluminum monoacetylacetonate bis( Examples include ethyl acetate, aluminum tris(acetylacetonate), aluminum ethyl acetate diisopropylate, aluminum ethyl ethylate, aluminum isopropylate, aluminum sec-butyrate, titanium tetrakis(acetylacetonate), titanium bis(butoxy)bis(acetylacetonate), titanium ethoxide, titanium isopropoxide, titanium n-butoxide, zinc octyolate, zinc naphthenate, barium octyolate, barium naphthenate, copper octyolate, copper naphthenate, calcium octyolate, calcium naphthenate, etc. These can be used individually or in combination of two or more.

[0053] The amount of component (G) is preferably 0.1 to 15 parts by weight (more preferably 0.3 to 10 parts by weight, more preferably 0.5 to 8 parts by weight) per 100 parts by weight of the solid content of component (A). Furthermore, the amount of metal in component (G) is preferably 0.01 to 5 parts by weight (more preferably 0.05 to 3 parts by weight) per 100 parts by weight of the solid content of component (A). This range enhances curability (initial drying properties) and allows for sufficient adhesion to the substrate and topcoat.

[0054] The coating material of the present invention may also contain a curing accelerator (X) that enhances the activity of component (G) above. Examples of curing accelerators include 1,10-phenanthroline and 2,2'-dipyridyl. These can be used individually or in combination of two or more. The weight ratio of the curing accelerator to the amount of metal contained in component (G) [(G) / (X)] is preferably 0.5 / 9.5 to 9.5 / 0.5 (more preferably 1 / 9 to 9 / 1). This further enhances curability and allows for sufficient adhesion to the substrate and topcoat material.

[0055] The coating material of the present invention may contain various components in addition to the components described above, to an extent that does not affect the effects of the present invention. Examples of such components include plasticizers, preservatives, fungicides, algaecides, defoamers, leveling agents, pigment dispersants, thickeners, anti-skinning agents, dehydrating agents, matting agents, ultraviolet absorbers, silane coupling agents, light stabilizers, antioxidants, catalysts, and the like. It may also contain resin components other than the above component (A). The coating material of the present invention can be manufactured by uniformly stirring and mixing the above components (A) to (D) (preferably components (A) to (G)) and, if necessary, each of these components by conventional methods. Furthermore, it is desirable to use the coating material of the present invention in a one-component form.

[0056] The coating material of the present invention can be preferably applied as a primer to substrates and existing coating films. Examples of base materials include concrete, mortar, slate boards, calcium silicate boards, ALC boards, extruded boards, slate tiles, cement tiles, new tiles, porcelain tiles, siding boards, metal, glass, wood, plywood, etc.

[0057] Furthermore, the old paint film refers to the paint film applied on the above-mentioned substrate, such as weather-resistant topcoats for buildings (JIS K5658:2010), weather-resistant paints for steel structures (JIS K5659:2008), glossy synthetic resin emulsion paints (JIS K5660:2008), fire-resistant paints for buildings (JIS K5661:1970), synthetic resin emulsion paints (JIS K5663:2008), road marking paints (JIS K5665:2011), and multi-color pattern paints (JIS K5667 Examples of coatings formed by JIS K5668:2010, synthetic resin emulsion pattern paints (JIS K5668:2003), acrylic resin-based non-aqueous dispersion paints (JIS K5670:2008), lead- and chromium-free rust-preventive paints (JIS K5674:2008), high solar reflectance paints for roofs (JIS K5675:2011), floor paints for buildings (JIS K5970:2008), waterproof coating materials for buildings (JIS A6021:2011), and finishing coating materials for buildings (JIS A6909:2014) are examples. In particular, the present invention can also be applied to fluororesin coatings, silicone resin coatings, etc.

[0058] In applying the coating material of the present invention, various methods such as brush painting, roller painting, and spray painting can be employed. Furthermore, when painting in a factory, a roll coater, flow coater, or the like can be used.

[0059] The amount of coating material to be applied is preferably 0.1 to 0.6 kg / m². 2 (more preferably 0.2~0.5 kg / m 2 The number of coats can be set appropriately depending on the surface condition of the substrate, but preferably 1 to 2 times. The drying time is preferably 1 hour to 1 week. The drying temperature is preferably -10°C to 50°C (more preferably -5°C to 40°C).

[0060] In this invention, a topcoat can be applied after the coating material has been applied and dried. By applying the topcoat, the finished surface can be protected, or its aesthetic appearance can be improved.

[0061] Various resins can be used as the resin component in the topcoat material. Examples of resin types include vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, acrylic silicone resin, fluororesin, etc., or composite resins thereof. Among these, one or more selected from acrylic resin, urethane resin, acrylic silicone resin, fluororesin, etc., are preferred. Furthermore, examples of such resin components include water-soluble resins, water-dispersible resins (resin emulsions), solvent-soluble resins, solvent-free resins, non-water-dispersible resins, powder resins, etc. Among these, one or more selected from water-based topcoats such as water-soluble resins and water-dispersible resins, and solvent-based (preferably weak solvent-based) topcoats such as solvent-soluble resins and non-water-dispersible resins, are preferred. When the coating material of the present invention is used as a primer, sufficient adhesion can be ensured even with a water-based topcoat material.

[0062] Such topcoat materials may contain various components other than those listed above, as long as the effects of the present invention are not significantly impaired. Examples of such components include thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, coloring pigments, extender pigments, aggregates, preservatives, antifungal agents, antialgal agents, antibacterial agents, dispersants, defoaming agents, adsorbents, fibers, crosslinking agents, ultraviolet absorbers, light stabilizers, antioxidants, decontamination agents, hydrophilic agents, water repellents, catalysts, solvents, and water. The topcoat material of the present invention can be manufactured by uniformly mixing the above resin components and, if necessary, the various components listed above by conventional methods. The form of the topcoat material can be, for example, a one-component type, a two-component type, or a multi-component type with more than one component.

[0063] For applying the topcoat, known painting tools can be used. Examples of painting tools include sprayers, rollers, brushes, etc. The amount of topcoat applied should be set appropriately according to the surface shape of the existing wall, the type of topcoat, the type of painting equipment, etc., but preferably 0.1 to 0.5 kg / m². 2 (More preferably 0.2~0.4 kg / m 2 ) During painting, the topcoat material can be diluted as needed. [Examples]

[0064] The following examples illustrate the features of the present invention. <Manufacturing of covering materials> The coating material was obtained by mixing and stirring each component according to the formulation shown in Table 1 using a standard method.

[0065] The following ingredients were used. (A) Resin component • Resin 1: Non-aqueous dispersion acrylic resin [Acrylic styrene resin, hydroxyl value: 40 mg KOH / g, acid value: 2 mg KOH / g, weight-average molecular weight: 70,000, glass transition temperature: 40°C, solids content: 50% by weight, medium: mineral spirits (aniline point 42°C)] • Resin 2: Non-aqueous dispersion acrylic resin [Alkyd resin-modified acrylic styrene resin, hydroxyl value: 40 mg KOH / g, acid value: 2 mg KOH / g, weight-average molecular weight: 70,000, glass transition temperature: 40°C, solid content: 50% by weight, alkyd resin modification rate: 1% by weight, medium: mineral spirits (aniline point 42°C)] • Resin 3: Soluble acrylic resin [Alkyd resin-modified acrylic styrene resin, hydroxyl value: 0 KOH mg / g, acid value: 3 mg KOH / g, weight-average molecular weight: 50,000, glass transition temperature: 41°C, solids content: 50% by weight, alkyd resin modification rate: 10% by weight, medium: mineral spirits (aniline point: 42°C)] • Resin 4: Soluble acrylic resin [Acrylic styrene resin, hydroxyl value: 0 KOH mg / g, acid value: 3 mg KOH / g, weight-average molecular weight: 50,000, glass transition temperature: 41°C, solids content: 50 wt%, alkyd resin modification rate: 0 wt%, medium: mineral spirits (aniline point: 42°C)] (B) Non-aqueous solvent containing aliphatic hydrocarbons • Mineral spirits (aniline point 42°C) (C) Polyisocyanate compound • Polyisocyanate compound 1 [Hexamethylene diisocyanate derivative solution, solids content: 100% by weight, isocyanate group content: 21% by weight] • Polyisocyanate compound 2 [Hexamethylene diisocyanate derivative solution, solids content: 100% by weight, isocyanate group content: 12% by weight] (D) Amine compounds • Amine 1: Urea compound [Ethylene urea content: 20% by weight, medium: methanol] • Amine 2: Hydrazides [Adipic acid dihydrazide content: 20% by weight, medium: methanol] (E) Coloring pigments • Rutile-type titanium dioxide (average particle size: 0.3 μm, specific gravity: 4.2) (F) Extender pigments • Calcium carbonate (average particle size: 10-20 μm, specific gravity 2.7) (G)Organometallic compound • Organometallic 1: Cobalt Octylate Mineral Spirit Solution [Active ingredient: 80% by weight, Co content: 12% by weight] (others) • Hardening accelerator [1,10-phenanthroline] (Additives) • Antifoaming agents, thickeners, dispersants, etc.

[0066] (Examples 1-11, Comparative Examples 1-3) The following evaluations were performed using each of the obtained coating materials. <Adhesion Evaluation 1> Apply the coating material at a rate of 0.30 kg / m² to the siding board, which already has an inorganic clear coating film applied as an existing coating. 2 Test specimens [I] were prepared by applying the material in the manner described above and drying them for 24 hours under standard conditions (temperature 23°C, relative humidity 50%). The adhesion of the prepared test specimens [I] was evaluated using the grid tape method in accordance with JIS K 5600-5-6. The evaluation criteria are as follows: AA: Defect area is less than 5% A: Defect area is 5% or more but less than 10% AB: Defect area is 10% or more but less than 25% B: Defect area is 25% or more but less than 40% C: Defect area is 40% or more but less than 55% D: Defect area is 55% or more

[0067] <Adhesion Evaluation 2> Apply the coating material at a rate of 0.30 kg / m² to the siding board, which already has an inorganic clear coating film applied as an existing coating. 2 The surface is applied in this manner, dried for 24 hours under standard conditions (temperature 23°C, relative humidity 50%), and then a water-based topcoat (acrylic silicone resin emulsion paint) is applied at a rate of 0.20 kg / m². 2 Test specimen [II] was prepared by applying the material in the manner described above and drying it in a 50°C environment for 24 hours. The prepared test specimens [II] were evaluated using the same method as in adhesion evaluation 1.

[0068] <Adhesion Evaluation 3> The prepared test specimens [II] were immersed in water at 20°C for 3 days, then removed, dried (23°C, 3 hours), and the coating condition was visually inspected for blistering, peeling, etc., and evaluated. The evaluation criteria were a four-level scale (A>B>C>D), with "A" indicating almost no abnormalities and "D" indicating abnormalities.

[0069] In Examples 1 to 11, good adhesion was obtained. In particular, in Examples 2 to 6 and 10, excellent adhesion was obtained to both the substrate and the water-based topcoat.

[0070] [Table 1]

Claims

1. The constituent components include a resin component (A), an aliphatic hydrocarbon-containing non-aqueous solvent (B), a polyisocyanate compound (C), and an organic amine compound (D). The above resin component (A) includes a non-aqueous dispersion resin (A-1) and a soluble resin (A-2). The above non-aqueous dispersion resin (A-1) and / or the above soluble resin (A-2) have hydroxyl groups, A coating material characterized in that the above-mentioned organic amine compound (D) is a weak solvent-type primer containing at least one compound selected from the group consisting of urea compounds, hydrazides, pyrrolidine, piperidine, morpholine, and dicyandiamide.

2. It contains extender pigments as a component, The coating material according to claim 1, characterized in that it contains 50 to 600 parts by weight of the extender pigment with respect to 100 parts by weight of the solid content of the resin component (A).

3. The coating material according to claim 1, characterized in that the solid content weight ratio [(A-1) / (A-2)] of the non-aqueous dispersion resin (A-1) and the soluble resin (A-2) is 2 / 98 to 80 / 20.

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