Covering material

Abstract

To provide a covering material containing an oxidation-curable resin, the covering material having sufficient levels of curability and glossiness.SOLUTION: A covering material comprises an oxidation-curable resin (A), a pigment (B), a metal dryer (C), and an aliphatic hydrocarbon-containing solvent (D) and also contains a hydrocarbon group-containing alkoxysilane compound (E).SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] Conventionally, in buildings, civil engineering structures, etc., for the purpose of imparting functionality to the base material, and improving protection and aesthetics, finishing is performed by applying various coating materials to form a film. In recent years, in the field of such coating materials, there has been an increasing trend to suppress the use of aromatic hydrocarbon-containing solvents such as toluene and xylene in consideration of safety during coating, work hygiene, or the impact on air pollution. In order to respond to such a trend, various environmentally friendly coating materials using aliphatic hydrocarbon-containing solvents have been proposed.

[0003] Also, as such an environmentally friendly coating material, a coating material using an oxidation-curing type resin is known (Patent Document 1, etc.). Patent Document 1 is a one-component crosslinkable (curing type) coating material that causes a crosslinking reaction by the oxidation of reactive double bonds contained in unsaturated fatty acids. Such coating materials containing an oxidation-curing type resin are widely adopted because of their excellent film physical properties.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since the above coating material forms a film by natural curing through an oxidative polymerization reaction, there is a possibility that the gloss may decrease as the curing progresses.

[0006] The present invention has been made in view of these points, and aims to ensure sufficient curability and gloss in a coating material containing an oxidation-curing resin. [Means for solving the problem]

[0007] To solve these problems, the inventors, after diligent research, conceived of a coating material comprising an oxidation-curing resin and a specific silane compound as essential components, and thus completed the present invention.

[0008] In other words, the present invention has the following features. 1. A coating material comprising an oxidation-curing resin (A), a pigment (B), a metal dryer (C), and an aliphatic hydrocarbon-containing solvent (D), Furthermore, it is characterized by containing a hydrocarbon group-containing alkoxysilane compound (E). For top coat Covering material. 2. The coating material according to 1, characterized in that it contains 0.05 to 10 parts by weight of the hydrocarbon group-containing alkoxysilane compound (E) per 100 parts by weight (solid content) of the oxidative curing resin (A). 3. The coating material according to claim 1, characterized in that the oxidative curing resin (A) includes a urethane-modified alkyd resin. [Effects of the Invention]

[0009] According to the coating material of the present invention, sufficient curability and gloss can be ensured, and a coating with excellent aesthetic appeal can be formed. [Modes for carrying out the invention]

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

[0011] <Coating material> The coating material of the present invention comprises an oxidative-curing resin (A), a pigment (B), a metal dryer (C), and an aliphatic hydrocarbon-containing solvent (D), and is a so-called weak solvent type coating material. The coating material of the present invention is characterized by containing a hydrocarbon group-containing alkoxysilane compound (E) in addition to the above components.

[0012] The oxidative curing resin (A) of the present invention (hereinafter also referred to as "component (A)") is characterized by being cured and dried by air oxidation due to oxidatively polymerizable double bonds (oxidative polymerizable groups), and being soluble and / or dispersible in an aliphatic hydrocarbon-containing non-aqueous solvent (C). Such component (A) is not particularly limited as long as it has oxidative polymerizable groups, for example, (A1) Alkyd resin (hereinafter also referred to as "component (A1)") (A2) A resin obtained by copolymerizing a vinyl monomer having an oxidative polymerizable group with another vinyl monomer copolymerizable with this monomer (hereinafter also referred to as "component (A2)"), (A3) 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 (hereinafter also referred to as "component (A3)"), These are some examples. These can be used individually or in combination of two or more types.

[0013] In the coating material of the present invention, it is preferable that component (A) contains an alkyd resin (A1). Examples of alkyd resins (A1) include resins obtained by condensation polymerization of a polybasic acid component, a polyhydric alcohol component, and an unsaturated fatty acid component. Modified alkyd resins obtained by modifying these are also examples.

[0014] Examples of polybasic acid components that make up the alkyd resin (A1) include phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, tetrahydrophthalic acid, succinic acid, maleic acid, fumaric acid, adipic acid, itaconic acid, azelaic acid, pyromellitic acid, and their acid anhydrides. These can be used individually or in combination of two or more.

[0015] Examples of the polyhydric alcohol component include ethylene glycol, propylene glycol, butanediol, decanediol, diethylene glycol, pentanediol, neopentyl glycol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, etc. These can be used alone or in combination of two or more.

[0016] Examples of the unsaturated fatty acid component include fatty acids of linseed oil, tung oil, fish oil, dehydrated castor oil, soybean oil, coconut oil, sesame oil, poppy seed oil, perilla oil, safflower oil, hemp seed oil, grape seed oil, tall oil, sunflower oil, cottonseed oil, corn oil, walnut oil, etc., fatty acids of drying oils and semi-drying oils, and synthetic unsaturated fatty acids represented by high-oleic fatty acids, etc. These can be used alone or in combination of two or more.

[0017] The alkyd resin can be obtained by a known method. For example, a method of dehydrating and condensing the above raw material components in an inert gas atmosphere at about 200 to 240°C until the acid value becomes 15 or less can be mentioned. In addition, as the alkyd resin in the present invention, those having an oil length of 10 to 80 (more preferably 20 to 70) are preferred. In the present invention, "α to β" is synonymous with "α or more and β or less".

[0018] Examples of the modified alkyd resin include those obtained by modifying a part of the above alkyd resin with one or two or more of, for example, polyvinyl chloride resin, acrylic resin, acrylic silicone resin, epoxy resin, urethane resin, silicone resin, polycarbonate resin, phenol resin, etc.

[0019] In the coating material of the present invention, it is preferable to contain a urethane-modified alkyd resin as the (A1) component. The urethane-modified alkyd resin is obtained by reacting an isocyanate group-containing compound with the hydroxyl groups of the above alkyd resin. By including the urethane-modified alkyd resin, the curability and glossiness can be enhanced. Examples of the isocyanate group-containing compound include aliphatic diisocyanates such as hexamethylene diisocyanate (including trimers), tetramethylene diisocyanate, and trimethylhexamethylene diisocyanate; alicyclic polyisocyanates such as isophorone diisocyanate and 4,4'-methylenebis(cyclohexyl isocyanate); and aromatic diisocyanates such as 4,4'-diphenylmethane diisocyanate, tolylene diisocyanate, and xylylene diisocyanate.

[0020] The method for reacting an isocyanate group-containing compound with an alkyd resin is not particularly limited, and known methods can be adopted. For example, a method of reacting an isocyanate group-containing compound with the hydroxyl groups of an alkyd resin in the presence of a catalyst can be mentioned. The catalyst that can be used is not particularly limited as long as it is a catalyst used in a normal urethanization reaction. Examples include amine-based catalysts such as triethylamine, N-ethylmorpholine, and triethylenediamine, and tin-based catalysts such as dibutyltin dilaurate and dioctyltin dilaurate. These can be used alone or in combination of two or more.

[0021] Also, as the (A1) component, a vinyl-modified alkyd resin can be included. The vinyl-modified resin is obtained by copolymerizing and / or graft-polymerizing a vinyl monomer with the above alkyd resin.

[0022] Examples of the vinyl monomer include (meth)acrylic acid alkyl esters, aromatic monomers, and other vinyl monomers.

[0023] Examples of alkyl (meth)acrylates include 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. These can be used individually or in combination of two or more.

[0024] Examples of aromatic monomers include styrene, 2-methylstyrene, vinyltoluene, t-butylstyrene, chlorostyrene, vinylanisole, vinylnaphthalene, and divinylbenzene. These can be used individually or in combination of two or more.

[0025] Other vinyl monomers that can be used include, for example, hydroxyl group-containing vinyl monomers, carboxyl group-containing vinyl monomers, amino group-containing vinyl monomers, and epoxy group-containing vinyl monomers. Examples of hydroxyl group-containing vinyl monomers include 2-hydroxyethyl (meth)acrylate and hydroxypropyl (meth)acrylate. These can be used individually or in combination of two or more. 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, etc. These can be used individually or in combination of two or more. Examples of amino group-containing vinyl monomers include N-methylaminoethyl (meth)acrylate, dimethylaminoethyl (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. Examples of epoxy group-containing vinyl monomers include glycidyl (meth)acrylate, β-methylglycidyl (meth)acrylate, 3,4-oxycyclohexylpropyl (meth)acrylate, and allyl glycidyl ether. These can be used individually or in combination of two or more.

[0026] Furthermore, vinyl monomers that are oxidatively polymerizable can also be used. Examples of vinyl monomers with oxidatively polymerizable groups 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 the epoxy group with the carboxyl group in the unsaturated fatty acid. The unsaturated fatty acids mentioned above can be used.

[0027] Other vinyl monomers having oxidative polymerizable groups can also be used, for example, dicyclopentadieneoxyalkyl group-containing vinyl monomers such as dicyclopentadieneoxyalkyl(meth)acrylate, and allyl group-containing vinyl monomers such as allyl(meth)acrylate.

[0028] The above components (A2) and (A3) are obtained by copolymerizing their respective monomers. The monomers that make up these components can be those described above. Furthermore, component (A3) is obtained by the addition reaction of an unsaturated fatty acid to an epoxy group in the resin, and catalysts such as tertiary amines or quaternary ammonium salts can be used when reacting the epoxy group with the unsaturated fatty acid.

[0029] In the present invention, component (A) can be used which has an acid value of preferably 0.1 to 20 mg KOH / g (more preferably 0.5 to 15 mg KOH / g). If the acid value of component (A) is within the above range, curability, gloss, adhesion, etc., after long-term storage are ensured. The acid value is expressed by the number of mg of potassium hydroxide equimolar to the acid groups contained in 1 g of solid content of component (A). To set the acid value of component (A) within the above range, for example, polybasic acid components, unsaturated fatty acid components, carboxyl group-containing vinyl monomers, etc., can be appropriately adjusted.

[0030] Pigment (B) (hereinafter also referred to as "component (B)") is a component that imparts color and opacity to the coating material of the present invention. In the present invention, it is preferable that pigment (B) includes at least titanium dioxide (B1) (hereinafter also referred to as "component (B1)"). Component (B1) plays the role of a white pigment. As component (B1), for example, rutile-type titanium dioxide, anatase-type titanium dioxide, or surface-treated products thereof can be used. In the present invention, it is preferable to include surface-treated rutile-type titanium dioxide. This makes it possible to achieve a paint finish with excellent curability and gloss.

[0031] As surface-treated rutile-type titanium oxide, for example, it is preferable that the surface of the rutile-type titanium oxide particles is surface-treated with at least an inorganic compound. Examples of inorganic compounds used for surface treatment include silica, alumina, zirconia, titania, tin oxide, antimony oxide, zinc oxide, etc. Among these, an embodiment containing one or more selected from the group consisting of silica, alumina, and zirconia is preferred. Other inorganic compounds may also include, for example, compounds containing phosphorus, calcium, magnesium, strontium, barium, etc. Such surface treatment with inorganic compounds can be carried out by known methods. For example, an aqueous solution of salts such as Si, Al, Zr, Ti, Sn, Sb, and Zn can be added to a slurry containing titanium oxide, and then an alkali or acid can be added to neutralize it to generate a hydrated oxide on the surface of the titanium oxide particles, followed by steps such as filtration, drying, and pulverization.

[0032] Furthermore, the surface-treated rutile-type titanium dioxide may be surface-treated with organic compounds in addition to the inorganic compounds mentioned above. Examples of organic compounds used for surface treatment include fatty acids, fatty acid esters, surfactants, metal soaps, silicone resins, fluororesins, acrylic resins, polyester resins, silane coupling agents, titanium coupling agents, and waxes. These can be used individually or in combination of two or more. Such surface treatment with organic compounds can be carried out by known methods; for example, a method can be employed in which the organic compound is added and mixed before or after drying of the surface treatment method using the inorganic compounds mentioned above.

[0033] The TiO2 content of component (B1) is preferably 95% or less (more preferably 80-94%). When the TiO2 content of component (B1) is within this range, the surface treatment tends to be thicker, which is advantageous in suppressing radical generation, does not inhibit hardening, and enhances the effects of the present invention. The TiO2 content is the value (mass fraction) measured according to JIS K5116:2004 7.2.

[0034] In the present invention, an extender pigment (B2) (hereinafter also referred to as "(B2) component") may be mixed as component (B). Examples of (B2) components 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. Component (B2) can be used, for example, for purposes such as adjusting solid content, viscosity, and gloss.

[0035] In the present invention, by including a coloring pigment other than titanium dioxide (B3) (hereinafter also referred to as "component (B3)") as component (B), it becomes possible to express a variety of colors. As component (B3), chromatic pigments, black pigments, etc., can be used. Among 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, 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. In addition, white pigments such as zinc oxide and aluminum oxide can also be used as component (B-3). These can be used individually or in combination of two or more.

[0036] The mixing ratio of component (B) in the coating material of the present invention is preferably 5 to 200 parts by weight (more preferably 10 to 150 parts by weight) per 100 parts by weight of the solid content of component (A). Also, component (B1) is preferably 5 to 150 parts by weight (more preferably 10 to 120 parts by weight) per 100 parts by weight of the solid content of component (A). When component (B2) is used, component (B2) is preferably 5 to 150 parts by weight (more preferably 10 to 100 parts by weight) per 100 parts by weight of the solid content of component (A). When component (B3) is used, component (B3) is preferably 0.1 to 100 parts by weight (more preferably 0.3 to 90 parts by weight) per 100 parts by weight of the solid content of component (A).

[0037] The metal dryer (C) (hereinafter also referred to as "component (C)") is a component that acts as a curing catalyst for component (A) above. As component (C), known organometallic compounds such as cobalt-based, manganese-based, zirconium-based, tin-based, lead-based, zinc-based, copper-based, iron-based, calcium-based, and barium-based compounds can be used. Specifically, examples include cobalt octoate, cobalt naphthenate, manganese octoate, manganese naphthenate, zirconium octoate, zirconium naphthenate, tin octoate, lead naphthenate, zinc naphthenate, copper naphthenate, iron naphthenate, calcium octoate, calcium naphthenate, barium octoate, and barium naphthenate. These can be used individually or in combination of two or more.

[0038] The mixing ratio of component (C) is preferably 0.001 to 10 parts by weight (more preferably 0.01 to 5 parts by weight) of metal content per 100 parts by weight of solid content of component (A).

[0039] Aliphatic hydrocarbon-containing solvents (D) (hereinafter also referred to as "component (D)") are non-aqueous solvents that have lower toxicity, higher operational safety, and less impact on air pollution compared to aromatic hydrocarbon-containing solvents. Examples of component (D) 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. The aliphatic hydrocarbon is preferably present in an amount of 5% by weight or more of the total amount of component (D), and more preferably in an amount of 10 to 80% by weight.

[0040] Component (D) 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 (aromatic hydrocarbon-containing petroleum mixed solvents) 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.

[0041] The mixing ratio of component (D) is preferably 50 to 300 parts by weight (more preferably 60 to 250 parts by weight) per 100 parts by weight of solids of component (A), from the viewpoint of workability and finish when applying multiple coats. Component (D) also includes the solvent used as a medium for each component.

[0042] The coating material of the present invention is characterized by further containing a hydrocarbon group-containing alkoxysilane compound (E) (hereinafter also referred to as "component (E)") in addition to the above components (A) to (D). By including component (E), the glossiness of the coating can be ensured. In particular, the decrease in glossiness that occurs as the hardening of component (A) progresses can be suppressed. The mechanism of action is not limited to the following, but in the coating material, component (E) is distributed (oriented) near the surface of component (B), thereby increasing the dispersion stability of component (B). Furthermore, during the oxidative polymerization reaction (hardening) of component (A), component (E) is present near component (B), so aggregation of component (B) can be suppressed. As a result, excellent gloss retention can be obtained.

[0043] Examples of component (E) include methyltrimethoxysilane, methyltriethoxysilane, methyltributoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltributoxysilane, propyltrimethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltributoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, dimethyldibutoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, dipropyldimethoxysilane, dipropyldiethoxysilane, dibutyldimethoxysilane, dibutyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, diphenyldibutoxysilane, dimethylphenylsilane, diethoxymethylphenylsilane, etc. These can be used individually or in combination of two or more, but it is preferable that they contain an alkoxysilane compound containing a hydrocarbon group with 1 to 10 carbon atoms.

[0044] In the present invention, it is particularly preferable that component (E) contains an aromatic hydrocarbon group-containing alkoxysilane. Examples of aromatic hydrocarbon group-containing alkoxysilanes include phenyltrimethoxysilane, phenyltriethoxysilane, dimethylphenylsisilane, diethoxymethylphenylsilane, methylphenyldiethoxysilane, diphenyldiethoxysilane, diphenyldimethoxysilane, and diphenyldibutoxysilane. These can be used individually or in combination of two or more.

[0045] The mixing ratio of component (E) in the coating material of the present invention is preferably 0.05 to 10 parts by weight (more preferably 0.1 to 9 parts by weight, and even more preferably 0.2 to 8 parts by weight) per 100 parts by weight of the solid content of component (A). Within this range, the effects of the present invention can be fully realized.

[0046] In addition to the components described above, the coating material of the present invention may also contain various other components to the extent that they do not affect the effects of the present invention. Examples of such components include synthetic resins, thickeners, film-forming aids, leveling agents, plasticizers, antifreeze agents, pH adjusters, diluents, preservatives, antifungal agents, antialgal agents, antibacterial agents, adsorbents, formaldehyde catchers, dispersants, defoaming agents, ultraviolet absorbers, antioxidants, light stabilizers, fibers, catalysts, crosslinking agents, and the like.

[0047] The coating material of the present invention preferably contains a dispersant (F) (hereinafter also referred to as "component (F)"). (F) Component can be, for example, a polymeric dispersant. Examples of polymeric dispersants include basic polymeric dispersants, neutral polymeric dispersants, and acidic polymeric dispersants. Such polymeric dispersants are not particularly limited, but examples include salts of long-chain polyaminoamides and acidic polymers, polycarboxylate salts of polyaminoamides, salts of long-chain polyaminoamides and polar acid esters, copolymers having acidic groups, hydroxyl group-containing carboxylic acid esters, alkylol aminoamides, acrylic copolymers with affinity for pigments, unsaturated polycarboxylic acid polyaminoamides, alkylammonium salts of acidic polymers, phosphate ester salts of copolymers with affinity for pigments, block copolymers with affinity for pigments, alkylammonium salts of block copolymers containing acidic groups, modified acrylic block copolymers, unsaturated polycarboxylic acid polymers or unsaturated polycarboxylic acid polymers and polysiloxanes, unsaturated polycarboxylic acid polymers, alkylammonium salts of polymer copolymers, polymer copolymers having pigment affinity groups, unsaturated acidic polycarboxylic acid polyesters and polysiloxanes, etc. These can be used individually or in combination of two or more.

[0048] In the present invention, it is preferable that component (F) contains a dispersant having an acid value. The acid value is preferably 5 to 100 mg KOH / g (more preferably 10 to 80 mg KOH / g, and even more preferably 20 to 60 mg KOH / g). By including such component (F) in combination with the above-mentioned component (E), the glossiness can be further enhanced. The acid value represents the number of mg of KOH required to neutralize 1 g of dispersant solids.

[0049] Furthermore, component (F) preferably contains a dispersant (amphoteric dispersant) having an acid value and an amine value. The acid value is preferably 5 to 100 mg KOH / g (more preferably 10 to 80 mg KOH / g, even more preferably 20 to 60 mg KOH / g). The amine value is also preferably 5 to 100 mg KOH / g (more preferably 10 to 80 mg KOH / g, even more preferably 20 to 60 mg KOH / g). By including such component (F) in combination with component (E) above, the glossiness can be further enhanced. The amine value represents the number of mg of KOH equivalent to the amount of HCl needed to neutralize 1 g of dispersant solids.

[0050] The mixing ratio of component (F) is preferably 0.05 to 20 parts by weight (more preferably 0.1 to 15 parts by weight) per 100 parts by weight of the solid content of component (A). Within this range, the effects of the present invention can be fully demonstrated.

[0051] The coating material of the present invention may contain synthetic resin (G) (excluding component (A) above). Synthetic resin (G) (hereinafter also referred to as "component (G)") is a component that is mixed for purposes such as improving various film properties (quick drying, film strength, weather resistance, etc.) or for color matching as a pigment dispersion. In the present invention, even when such component (G) is mixed, sufficient curability and gloss can be ensured. Component (G) is not particularly limited and examples include acrylic resin, urethane resin, epoxy resin, vinyl chloride resin, vinyl acetate resin, acrylic silicone resin, fluororesin, silicon resin, polyvinyl alcohol, cellulose derivative, etc., or composites thereof. These can be used one or more of each. The mixing ratio of component (G) can be appropriately set according to the desired physical properties, etc., but is preferably 50 parts by weight or less (more preferably 0.05 to 40 parts by weight, and even more preferably 0.1 to 30 parts by weight) per 100 parts by weight of solid content of component (A). In this range, the effects of the present invention can be fully demonstrated.

[0052] The coating material of the present invention can be manufactured by uniformly stirring and mixing the above-mentioned components using conventional methods. The coating material of the present invention can be used in a one-component form. Furthermore, the coating material of the present invention can be used as a topcoat coating material, particularly a glossy coating material, and is suitable as JIS K 5516:2019 synthetic resin blended paint type 1. The specular gloss of the film formed by the coating material of the present invention (measurement angle 20 degrees) is preferably 70 or higher (more preferably 75 or higher).

[0053] <Film formation method> The coating material of the present invention can be applied mainly to protect the structure and improve the aesthetics of buildings, civil engineering structures, etc., and is suitable, for example, as a topcoat coating material applied to a substrate via an undercoat coating. In the present invention, for example, a coating can be formed by applying an undercoat to a substrate and then applying the coating material of the present invention.

[0054] The base material is primarily used for protecting the structure of buildings, civil engineering structures, etc. Examples of base materials include concrete, mortar, porcelain tiles, siding boards, extruded boards, color steel plates, copper plates, aluminum plates, titanium plates, stainless steel plates, galvanized steel plates, metals, glass, plastics, wood, and plywood. These base materials may have a pre-existing coating on their surface. In this invention, the primer can be applied directly to the base material, but it is also possible to pre-treat the base material with some kind of surface treatment (such as primer treatment with filler or putty).

[0055] Various known or commercially available primers can be used as undercoats. Specifically, examples of primers include acrylic resin primers, epoxy resin primers, urethane resin primers, and chlorinated rubber primers. Such primers may be clear or colored. They may also contain rust-preventive pigments such as phosphate, molybdate, or zinc-based pigments.

[0056] The primer material contains the above-mentioned binder component as an essential component, and it is also possible to incorporate various other components to an extent that does not affect the effects of the present invention. Examples of such components include coloring pigments, extender pigments, rust inhibitors, thickeners, film-forming aids, leveling agents, plasticizers, antifreeze agents, pH adjusters, diluents, preservatives, antifungal agents, antialgal agents, antibacterial agents, dispersants, defoaming agents, ultraviolet absorbers, antioxidants, light stabilizers, fibers, catalysts, crosslinking agents, and the like.

[0057] Such primers can be applied using various methods, such as brush painting, roller painting, spray painting, roll coater, and flow coater. The application rate depends on the form of the primer, but is preferably 0.05 to 3 kg / m². 2 (more preferably 0.05~2kg / m 2 )

[0058] Various methods can be used to apply the coating material of the present invention, such as brush coating, roller coating, spray coating, roll coater, and flow coater. In this case, the coating material of the present invention may be appropriately diluted with an aliphatic hydrocarbon solvent. The application amount is preferably 0.1 to 0.5 kg / m². 2 To that extent. Furthermore, the coating material may be finished with a single layer, or it may be finished by laminating two or more layers. [Examples]

[0059] The following examples illustrate the features of the present invention.

[0060] (Coating material 1~12) Using the raw materials listed below, coating materials 1 to 6 (white paint) were manufactured by mixing them according to the formulations shown in Table 1 using conventional methods.

[0061] The following raw materials were used for each topcoat material. (A) Oxidation-curing resin (A1-1) Alkyd resin [Soybean oil fatty acid modified product of pentaerythritol, glycerin, and phthalic anhydride bicondensate, oil length: 45%, solids content: 50% by weight, solvent: mineral spirits] (A1-2) Urethane-modified alkyd resin [Reaction compound of the above (A1-1) alkyd resin and tolylene diisocyanate, oil length: 50%, solids content: 50% by weight, solvent: mineral spirits] (B) Pigments (B1-1) Surface-treated rutile-type titanium oxide [TiO2 content: 93%, surface treatment compounds: silica, alumina, zirconia] (B1-2) Untreated rutile-type titanium dioxide [TiO2 content: 99%] (B2) Extender pigment [heavy calcium carbonate] (B3) Red pigment (ferric oxide) (C) Metal dryer [Mixture of cobalt naphthenate and zirconium naphthenate, solvent: mineral spirits, Co content: 0.3% by weight, Zr content: 3% by weight] (D) Non-aqueous solvent containing aliphatic hydrocarbons [Mixture of mineral spirits and petroleum mixed solvent containing aromatic hydrocarbons (aliphatic hydrocarbon content ratio 65% by weight)] (E) Hydrocarbon group-containing alkoxysilane compounds (E-1) Aromatic hydrocarbon group-containing alkoxysilane compound [phenyltrimethoxysilane / dimethoxymethylphenylsilane mixture] (E-2) Aromatic hydrocarbon group-containing alkoxysilane compound [phenyltrimethoxysilane] (E-3) Hydrocarbon group-containing alkoxysilane compound [methyltrimethoxysilane] (F) Dispersant (F1) Dispersion of phosphate salt of polymer copolymer [Solid content: 50% by weight, Acid value: 45 mg KOH / g, Amine value: 40 mg KOH / g, Solvent: Mineral spirits] (F2) Alkylammonium salt dispersion of acidic polymer copolymer [Solid content: 50% by weight, Acid value: 73 mg KOH / g, Amine value: 76 mg KOH / g, Solvent: Mineral spirits] (F3) Copolymer containing acidic groups [Solid content: 100% by weight, Acid value: 100 mg KOH / g, Amine value: 0] (G) Acrylic resin [Acrylic polyol resin, solids content: 50% by weight, solvent: mineral spirits] • Additives [defoaming agents, thickeners, UV absorbers, light stabilizers, etc.]

[0062] (Examples 1-11, Comparative Example 1) The following evaluations were conducted for each coating material. The results are shown in Table 1.

[0063] ·Curability The coating material was applied to one side of a glass plate using a film applicator with a gap of 75 μm, and the time required to obtain a dry coating (curing time in accordance with JIS K 5600-3-3:1999) was evaluated. The evaluation criteria are as follows. "a" Curing and drying time is less than 8 hours "b" Curing and drying time is 8 hours or more but less than 10 hours "c" Curing and drying time is 10 hours or more

[0064] • Glossiness (gloss retention) A coating material was applied to one side of a glass plate using a film applicator with a 100 μm gap. The specular gloss (measurement angle 20 degrees) (initial gloss) was measured after drying for 48 hours under standard conditions with the coated surface placed horizontally, and after drying for 7 days (measurement angle 20 degrees). The change in gloss (degree of decrease relative to the initial gloss) was evaluated. The initial gloss was 70 or higher in all cases. The evaluation criteria are as follows: "a" Gloss difference is less than 5 "b" Gloss difference of 5 or more but less than 10 "c" Gloss difference of 10 or more but less than 20 "d" Gloss level difference of 20 or more

[0065] [Table 1]

[0066] (Examples 12-21, Comparative Example 2) According to the formulations shown in Table 2, coating materials were prepared by mixing acrylic resin (50% solids by weight) with 100 parts by weight of white paint (coating materials 1, 2, 3, 6, and 12). Then, the curability and gloss were evaluated in the same manner as described above. The results are shown in Table 2.

[0067] [Table 2]

Claims

1. A coating material comprising an oxidation-curing resin (A), a pigment (B), a metal dryer (C), and an aliphatic hydrocarbon-containing solvent (D), Furthermore, a topcoat coating material characterized by containing a hydrocarbon group-containing alkoxysilane compound (E).

2. The coating material according to claim 1, characterized in that it contains 0.05 to 10 parts by weight of the hydrocarbon group-containing alkoxysilane compound (E) per 100 parts by weight (solid content) of the oxidative curing resin (A).

3. The coating material according to claim 1, characterized in that the oxidation-curing resin (A) includes a urethane-modified alkyd resin.

Images