Coated articles

Abstract

To provide a coated article that maintains the appearance of wood and has excellent flame retardancy, moisture resistance and water resistance. [Solution] A coated article has, on at least a portion of the surface of a wood substrate, a resin layer (1) made of a cured product of a coating composition containing the following components (A), (B), and (C), and has, on said resin layer (1), a resin layer (2) made of a cured product of a surface protective coating composition: The coating amount of the resin layer (1) is 100 to 1000 g / m 2 of the wood substrate. 2 and the coating amount of the resin layer (2) is 5 to 150 g / m2 relative to the wood substrate. 2 A coated article. (A) Organopolysiloxane represented by formula (I) (R 5 3SiO 1 / 2 ) f (R 6 2SiO) g (R 7 1SiO 3 / 2 ) h (SiO2) i (OR 8 ) j (I) (R 5 , R 6 and R 7 represents an alkyl group or the like which may be substituted with an amino group or the like, and R 5 , R 6 and R 7 At least a part of R is an alkyl group substituted with an amino group, 8 represents a hydrogen atom, etc., f is 0 to 0.5, g is 0 to 0.5, h is 0.2 to 1.0, i is 0 to 0.5, j is 0 to 3.0, and is a number that satisfies f+g+h+i=1.) (B) Flame retardant (C) Inorganic filler

Description

[Technical Field]

[0001] The present invention relates to a coated article, and more particularly to a flame-retardant coated article comprising a wood substrate and a surface coating film. [Background technology]

[0002] In recent years, the use of wood in buildings has been promoted from the perspective of carbon fixation and the effective use of domestic resources. However, wood is a flammable base material, and its use in applications requiring flame retardancy is severely limited. In this context, various techniques for imparting flame retardancy to wood have been investigated.

[0003] For example, Patent Document 1 successfully imparts flame retardancy by impregnating wood with a high concentration of a flame retardant such as boric acid. However, this system has the problem that the flame retardant adsorbed on the wood elutes or deliquesces due to moisture in the air, significantly impairing the aesthetic appearance.

[0004] Patent Document 2 reports that leaching of chemicals can be suppressed by impregnating wood with a boron compound and then coating the wood surface with a siloxane compound. However, when this method is used, there have been reported cases where the boron compound dissolves in the moisture contained in the wood itself, causing efflorescence at the interface between the coating film and the wood. In addition, this method requires many steps, including impregnation with a flame retardant, drying, and surface coating, which inevitably increases manufacturing costs.

[0005] Patent Document 3 reports a technology that imparts flame retardancy to wood without impregnating the wood with a flame retardant by coating the wood surface with a primer component whose main component is silica and then coating water glass on top of that. However, water glass has known problems such as low hardening and water resistance, and it reacts with wood to cause discoloration, so there are many challenges to overcome before it can be put into practical use.

[0006] Patent Document 4 reports that a coating composition containing a specified amino-modified organopolysiloxane, a specified flame retardant, and an inorganic filler provides a coating film with good transparency and moisture resistance, and is capable of imparting flame retardancy to flammable substrates such as wood. However, while this coating composition can be used without problems in applications where direct contact with water is not a concern, such as indoor components, prolonged direct contact with water can cause film roughening, limiting its use in outdoor environments where it is directly exposed to rain. In addition, the expansion of the coating film during combustion can cause cracks in the fire-resistant layer, reducing flame retardancy. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 3538194 [Patent Document 2] Patent No. 4367640 [Patent Document 3] Japanese Patent Application Laid-Open No. 2018-115294 [Patent Document 4] Japanese Patent Application Publication No. 2023-176311 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in view of the above circumstances, and has as its object to provide a coated article which maintains the appearance of wood, such as the grain, and which has excellent flame retardancy, moisture resistance, and water resistance. [Means for solving the problem]

[0009] As a result of extensive research into achieving the above-mentioned objective, the inventors discovered that the above-mentioned objective can be achieved by a coated article in which a specified resin layer is laminated on the surface of a wood substrate in a specified coating amount, and thus completed the present invention.

[0010] That is, the present invention is 1. A coated article having a resin layer (1) formed on at least a portion of the surface of a wood substrate, directly or via one or more other layers, comprising a cured product of a coating composition containing the following components (A), (B), and (C), and having a resin layer (2) formed on the resin layer (1), directly or via one or more other layers, comprising a cured product of a surface protective coating composition, The coating amount of the resin layer (1) is 100 to 1000 g / m 2 of the wood substrate. 2 and the coating amount of the resin layer (2) is 5 to 150 g / m2 relative to the wood substrate. 2 a coated article, (A) 100 parts by mass of an organopolysiloxane having a unit ratio represented by the following formula (I): (R 5 3SiO 1 / 2 ) f (R 6 2SiO) g (R 7 1SiO 3 / 2 ) h (SiO2) i (OR 8 ) j (I) (In the formula, R 5 , R 6 and R 7 each independently represents a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, which may be substituted with one or more amino groups, hydroxy groups, epoxy groups, acid anhydride groups, maleimide groups, vinyl groups, allyl groups, acrylic groups, methacrylic groups, or heterocyclic groups, and 5 , R 6 and R 7 at least a part of which is an alkyl group having 1 to 20 carbon atoms substituted with an amino group, an aryl group having 6 to 20 carbon atoms substituted with an amino group, or an aralkyl group having 7 to 20 carbon atoms substituted with an amino group, 8 are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, f is 0 to 0.5, g is 0 to 0.5, h is 0.2 to 1.0, i is 0 to 0.5, and j is a number that satisfies 0 to 3.0, and f+g+h+i=1. (B) one or more flame retardants selected from phosphorus-based, boron-based, magnesium-based, aluminum-based, nitrogen-based, antimony-based, and halogen-based compounds: 50 to 300 parts by mass (C) Inorganic filler: 25 to 150 parts by mass 2. The coated article according to 1, wherein the surface protective coating composition forming the resin layer (2) is one or more selected from the group consisting of urethane curing coatings, silicone acrylic coatings, fluorine-based coatings, and silicone coatings. 3. The coated article according to 1 or 2, wherein the ratio of the total mass of the component (B) and the component (C) to the total mass of the component (A) and the active ingredient (F) in the resin layer (2), [(B) + (C)] / [(A) + (F)], is 0.8 to 2.0. 4. A resin layer (3) consisting of a cured product of a coating composition containing the following components (i) and (ii) is further coated between the surface of the wood substrate and the resin layer (1) directly or via one or more other layers, in an amount of 5 to 100 g / m2 relative to the wood substrate: 2 4. The coated article according to any one of 1 to 3, (i) 100 parts by mass of an organopolysiloxane composed of units represented by the following formula (II): (R 1 3SiO 1 / 2 ) a (R 2 2SiO) b (R 3 1SiO 3 / 2 ) c (SiO2) d (OR 4 ) e (II) (In the formula, R 1 , R 2 and R 3 each independently represents a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, which may be substituted with one or more amino groups, hydroxy groups, epoxy groups, acid anhydride groups, maleimide groups, vinyl groups, allyl groups, acrylic groups, methacrylic groups, or heterocyclic groups, and which may have an ether bond, 1 , R2 and R 3 at least a part of which is an alkyl group having 1 to 20 carbon atoms and substituted with a hydroxy group and optionally having an ether bond, an aryl group having 6 to 20 carbon atoms and substituted with a hydroxy group and optionally having an ether bond, or an aralkyl group having 7 to 20 carbon atoms and substituted with a hydroxy group and optionally having an ether bond, and R 4 are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, a is 0 to 0.5, b is 0 to 0.5, c is 0.2 to 1.0, d is 0 to 0.5, and e is a number that satisfies the relationship a+b+c+d=1. (ii) Inorganic filler: 100 to 900 parts by mass 5. The coated article according to 4, wherein the coating composition further contains (iii) one or more flame retardants selected from phosphorus-based, boron-based, magnesium-based, aluminum-based, nitrogen-based, antimony-based, and halogen-based compounds in an amount of 10 to 300 parts by mass per 100 parts by mass of the component (i). 6. The coated article according to 5, wherein the ratio of the total mass of the component (B), the component (C), the components (ii) and (iii) in the resin layer (3) to the total mass of the component (A), the component (i) in the resin layer (3), and the active ingredient (F) in the resin layer (2) [(B) + (C) + (ii) + (iii)] / [(A) + (F) + (i)] is 0.9 to 2.0. to provide. [Effects of the Invention]

[0011] The coated article of the present invention has a predetermined coating amount of a resin layer (1) obtained from a coating composition containing an organopolysiloxane, a flame retardant, and an inorganic filler on a wooden substrate, and upon combustion, the coating film becomes ceramic to form a fire-resistant layer and / or a heat-insulating layer, thereby preventing the wooden substrate from burning. Furthermore, by providing a predetermined coating amount of the resin layer (2) obtained from the surface protective coating composition on the resin layer (1), it is possible to provide a coated article having excellent water resistance, and in addition, it is possible to suppress the deterioration of flame retardancy due to the expansion of the coating film during combustion. The present invention makes it possible to impart flame retardancy and water resistance to wooden substrates by applying the coating composition to the surface of the wooden substrate, and can easily impart flame retardancy to wooden substrates regardless of whether they are used indoors or outdoors. In addition, it is possible to make the wooden substrate flame-retardant by on-site application, which is expected to greatly expand the freedom of design and / or construction of wooden buildings. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will be specifically described below.

[0013] The coated article of the present invention has, on at least a portion of the surface of a wood substrate, directly or via one or more other layers, a resin layer (1) consisting of a cured product of a coating composition containing the following components (A), (B), and (C), and also has, on the resin layer (1), directly or via one or more other layers, a resin layer (2) consisting of a cured product of a surface protective coating composition.

[0014] [1] Wood base material Examples of wood substrates include wood materials such as lumber, logs, plywood, laminated veneer lumber (LVL), glued lumber, cross-laminated timber (CLT), high-strength engineered wood lumber (LSL), laminated veneer board (LVB), laminated veneer sandwich (LVS), parallel strand lumber (PSL), medium-density fiberboard (MDF), structural panels (oriented strand board (OSB)), particle board, and fiberboard. In particular, construction materials such as lumber, laminated lumber, and CLT-type substrates are suitable.

[0015] Furthermore, these wood substrates and wood substrates whose surfaces have been treated, specifically, wood that has been chemically treated, corona discharge treated, plasma treated, impregnated with a flame retardant or anti-termite agent, or wood substrates that have been treated with an acid or alkaline solution, can also be used.

[0016] Alternatively, the surface of a wood substrate on which other functional layers have already been formed may be coated with the coating composition of the present invention. Other functional layers include a rust prevention layer, a gas barrier layer, a waterproof layer, a heat ray shielding layer, etc., and one or more of these layers may be formed in advance on the wood substrate.

[0017] [2] Resin layer (1) The resin layer (1) (hereinafter sometimes referred to as the intermediate coating layer) is a resin layer formed by applying a coating composition containing the following components (A) to (C) to at least a portion of the surface of a wooden substrate, either directly or via one or more other layers, and then curing the coating composition. Note that, in this invention, curing also includes forming a coating film by simply drying the coating composition after applying it to the surface of the wooden substrate, without curing by crosslinking. (A) an organopolysiloxane having a unit ratio represented by the following formula (I): (B) Flame retardant (C) Inorganic filler

[0018] (A) Organopolysiloxane Component (A) is an organopolysiloxane composed of units represented by the following formula (I): In formula (I), unless otherwise specified, (R 5 3SiO 1 / 2 ) is expressed as M units, (R 6 2SiO) is expressed as D unit, (R 7 SiO 3 / 2 The unit represented by (SiO2) is called the T unit, and the unit represented by (SiO2) is called the Q unit.

[0019] (R 5 3SiO 1 / 2 ) f (R 6 2SiO) g (R 7 1SiO 3 / 2 ) h (SiO2) i (OR 8 ) j (I)

[0020] In formula (I), R 5, R 6 and R 7 each independently represents a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, which may be substituted with one or more amino groups, hydroxy groups, epoxy groups, acid anhydride groups, maleimide groups, vinyl groups, allyl groups, acrylic groups, methacrylic groups, or heterocyclic groups, and these R 5 , R 6 and R 7 At least some of them are alkyl groups having 1 to 20 carbon atoms substituted with an amino group, aryl groups having 6 to 20 carbon atoms substituted with an amino group, or aralkyl groups having 7 to 20 carbon atoms substituted with an amino group.

[0021] The alkyl group having 1 to 20 carbon atoms may be linear, branched, or cyclic, and specific examples thereof include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, n-octyl, n-decyl, cyclopentyl, and cyclohexyl groups, with methyl and ethyl groups being preferred from the viewpoint of increasing the flame retardancy of the coating composition. Examples of the aryl group having 6 to 20 carbon atoms include phenyl and naphthyl. Examples of the aralkyl group having 7 to 20 carbon atoms include benzyl and phenethyl groups. Examples of heterocyclic groups include piperidinyl, pyridinyl, pyrrolyl, and thienyl groups.

[0022] As described above, in formula (I), R 5 , R 6 and R 7 At least a part of these is an alkyl group having 1 to 20 carbon atoms substituted with an amino group, an aryl group having 6 to 20 carbon atoms substituted with an amino group, or an aralkyl group having 7 to 20 carbon atoms substituted with an amino group, and such groups substituted with an amino group are preferably a γ-aminopropyl group or an N-(2-aminoethyl)-3-aminopropyl group. Considering the solubility of component (A) in water, the compatibility with the flame retardant component and the substrate, etc., R 5 , R 6 and R 7 Among these, the total number of alkyl groups having 1 to 20 carbon atoms and substituted with amino groups, aryl groups having 6 to 20 carbon atoms and substituted with amino groups, or aralkyl groups having 7 to 20 carbon atoms and substituted with amino groups is preferably 50 mol % or more, more preferably 55 mol % or more, and even more preferably 60 mol % or more, based on the total number of silicon atoms in formula (I).

[0023] In addition, R 5 , R 6 and R 7 Among these, the substituents other than the group substituted with an amino group are preferably methyl or ethyl groups, which have a small number of carbon atoms in the combustible alkyl chain, and more preferably methyl groups.

[0024] In formula (I), R 8 each independently represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Specific examples of alkyl groups having 1 to 8 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, and n-octyl groups. Among these, R is the most suitable from the viewpoint of flame retardancy of the coating composition. 8 is preferably a hydrogen atom.

[0025] f is a number between 0 and 0.5, g is a number between 0 and 0.5, h is a number between 0.2 and 1.0, and i is a number between 0 and 0.5, and f+g+h+i=1. j is a number from 0 to 3.0, and from the viewpoint of the water solubility of the organopolysiloxane, is preferably a number from 0.1 to 2.0. If j exceeds 3.0, the film-forming properties of the coating composition and the moisture resistance of the coating film deteriorate.

[0026] The component (A) is preferably one represented by the following formula: (R 70 1SiO 3 / 2 ) h (SiO2)i (OR 80 ) j

[0027] In the above formula, R 70 are groups selected from a methyl group, an ethyl group, a γ-aminopropyl group, and an N-(2-aminoethyl)-3-aminopropyl group, but at least a portion of them are γ-aminopropyl groups or N-(2-aminoethyl)-3-aminopropyl groups, and R 80 is a hydrogen atom. h, i, and j are the same as above.

[0028] The organopolysiloxane of component (A) has undergone a certain degree of condensation, which facilitates network formation and facilitates fixation to the substrate. In addition, it has the advantage of having fewer alkoxy groups, which are a source of flammable gas, than monomer components (such as silane coupling agents) that do not contain siloxane bonds (Si-O-Si bonds), resulting in less reduction in flame retardancy.

[0029] The amount of the monomer component not containing a siloxane bond is preferably 50% by mass or less, more preferably 30% by mass or less, even more preferably 10% by mass or less, and even more preferably 1% by mass or less, based on the organopolysiloxane of component (A).

[0030] The ratio of the monomer component not containing a siloxane bond to the organopolysiloxane component is 29 It can be determined from the signal and integral ratio in the Si-NMR (nuclear magnetic resonance) spectrum. 29 In Si-NMR, for example, in the case of a trifunctional siloxane (T unit), the number of silicon atoms forming the siloxane bond can be determined by examining the ratios of (T0) to (T3) shown below. The detected magnetic field generally increases in the order of T3 > T2 > T1 > T0, so the T0 component is the silicon atom derived from the silane coupling agent, and the others are silicon atoms derived from the siloxane. Therefore, the ratio of the integral values ​​of each peak can be used to determine the ratio of the monomer (silane coupling agent) component to the organopolysiloxane component.

[0031] [ka] (In the formula, R represents an organic group, and X represents a hydrogen atom or an organic group.)

[0032] The organopolysiloxane of component (A) can be produced by hydrolysis and condensation of the monomer components of the respective structural units in the presence of an acid or base catalyst.

[0033] Examples of monomers of Q units include tetramethoxysilane, tetraethoxysilane, tetra(n-propoxy)silane, tetra(isopropoxy)silane, tetra(n-butoxy)silane, alkali silicate, and activated silicic acid obtained by cation exchange of alkali silicate.

[0034] Monomers of T units include methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltriisopropoxysilane, propyltrimethoxysilane, propyltriethoxysilane, propyltriisopropoxysilane, phenyltrimethoxysilane, vinyltrimethoxysilane, allyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-acryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β-(3 ,4-epoxycyclohexyl)ethyltrimethoxysilane, γ-chloropropyltrimethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltriethoxysilane, perfluorooctylethyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, γ-isocyanatepropyltrimethoxysilane, γ-isocyanatepropyltriethoxysilane, and the like. Among these, taking into consideration the solubility of the resulting siloxane in water and the affinity with wood and flame retardant components, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, γ-isocyanatepropyltrimethoxysilane, γ-isocyanatepropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane are preferred, and γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and N-(2-aminoethyl)-3-aminopropyltriethoxysilane are more preferred.

[0035] Examples of monomers of D units include dimethyldimethoxysilane, dimethyldiethoxysilane, methylethyldimethoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, methylpropyldimethoxysilane, methylpropyldiethoxysilane, diisopropyldimethoxysilane, phenylmethyldimethoxysilane, vinylmethyldimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, and N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane. Among these, γ-aminopropylmethyldiethoxysilane and N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane are preferred, taking into consideration the solubility of the resulting siloxane in water and the affinity with wood and flame retardant components.

[0036] Monomers of M units include trimethylmethoxysilane, trimethylethoxysilane, triethylmethoxysilane, n-propyldimethylmethoxysilane, n-propyldiethylmethoxysilane, isopropyldimethylmethoxysilane, isopropyldiethylmethoxysilane, isopropyldimethylethoxysilane, n-butyldimethylmethoxysilane, n-butyldimethylethoxysilane, n-hexyldimethylmethoxysilane, n-hexyldimethylethoxysilane, n-pentyldimethylmethoxysilane, n-pentyldimethylethoxysilane, and n-hexyldimethylmethoxysilane. Examples of suitable silanes include silane, n-hexyldimethylethoxysilane, n-decyldimethylmethoxysilane, n-decyldimethylethoxysilane, trimethylsilanol, triethylsilanol, n-propyldimethylsilanol, n-propyldiethylsilanol, isopropyldimethylsilanol, isopropyldiethylsilanol, n-butyldimethylsilanol, n-hexyldimethylsilanol, n-pentyldimethylsilanol, n-decyldimethylsilanol, γ-aminopropyldimethylmethoxysilane, and N-(2-aminoethyl)-3-aminopropyldimethylmethoxysilane. Among these, γ-aminopropyldimethylmethoxysilane and N-(2-aminoethyl)-3-aminopropyldimethylmethoxysilane are preferred, taking into consideration the solubility in water of the resulting organopolysiloxane and the affinity with the substrate and flame retardant components.

[0037] Since M units and D units have two or more Si-C bonds and are easily combustible, the content of M units and D units of all structural units in the organopolysiloxane of component (A) is each 50 mol % or less. That is, in the above formula (I), f is a number from 0 to 0.5, preferably a number from 0 to 0.2, and more preferably a number from 0 to 0.1. Furthermore, g is a number from 0 to 0.5, preferably a number from 0 to 0.2, and more preferably a number from 0 to 0.1.

[0038] T units have one Si-C bond and are less flammable than D units or M units, so by including 20 mol % or more of T units among all the structural units in the organopolysiloxane of component (A), good flame retardancy is achieved. That is, in the above formula (I), h is a number from 0.2 to 1.0, preferably a number from 0.5 to 1.0, and more preferably a number from 0.6 to 1.0.

[0039] Q units do not contain Si-C bonds and are therefore less flammable, effectively preventing a decrease in flame retardancy due to combustion resulting from the Si-C bonds. On the other hand, Q units have many crosslinking points and are highly reactive, so from the viewpoint of compatibility with flame retardant components and film-forming properties, the Q units should be in the range of 0 to 50 mol % of all structural units in the organopolysiloxane of component (A). That is, i is a number from 0 to 0.5, preferably a number from 0.1 to 0.4, and more preferably a number from 0.3 to 0.4.

[0040] The ratio of each structural unit in component (A) is, for example, 29 This can be confirmed by a known method using the ratio of the chemical shift and integral value of the Si-NMR signal.

[0041] The content of component (A) is preferably 5 to 60% by mass, more preferably 10 to 40% by mass, based on the total weight of the coating composition for forming the resin layer (1). When the content is 5% by mass or more, the film-forming properties, transparency, and moisture resistance of the coating film are improved. When the content is 60% by mass or less, the flame retardancy of the coating film is improved. The component (A) may be used alone or in combination of two or more types.

[0042] (B) Flame retardant Component (B) is one or more flame retardants selected from phosphorus-based, boron-based, magnesium-based, aluminum-based, nitrogen-based, antimony-based and halogen-based compounds. Examples of phosphorus compounds include organic phosphorus compounds, phosphoric acid, phosphate esters, and phosphate salts, and specific examples thereof include diammonium hydrogen phosphate, ammonium dihydrogen phosphate, diguanidine phosphate, ammonium polyphosphate, hydrophobized ammonium polyphosphate, guanylurea phosphate, carbamate polyphosphate, and melamine phosphate. Examples of boron compounds include organic boron compounds, boric acid, borax, boron oxide, boric acid esters, and borate salts. Examples of magnesium compounds include magnesium hydroxide and magnesium oxide. The aluminum-based compound may, for example, be aluminum hydroxide. Examples of nitrogen-based compounds include ammonium sulfate, ammonium carbonate, ammonium hydrogen carbonate, and melamine cyanurate. Examples of antimony compounds include antimony trioxide. Examples of halogen compounds include zinc chloride.

[0043] Among these, phosphorus-based compounds and boron-based compounds are preferred as flame retardants contained in the resin layer (1), and it is particularly preferred to use phosphates and polyphosphates, which form a carbonized layer in a short time and easily ensure flame retardant performance. In particular, it is preferable to use a water-soluble phosphate and / or polyphosphate in combination with a water-insoluble phosphate and / or polyphosphate, since this further improves the flame retardancy and moisture resistance of the coating film without impairing the transparency of the coating film.

[0044] The blending amount of component (B) is 50 to 300 parts by mass, preferably 75 to 250 parts by mass, per 100 parts by mass of the organopolysiloxane of component (A). If it is less than 50 parts by mass, the flame retardancy of the coating film will be insufficient, and if it exceeds 300 parts by mass, the film-forming properties, transparency, and moisture resistance of the coating film will be poor. The component (B) may be used alone or in combination of two or more types.

[0045] (C) Inorganic filler As the inorganic filler of component (C), known general inorganic fillers can be used, such as inorganic fillers containing Group 13 elements, Group 14 elements (excluding carbon), first series transition elements, second series transition elements, third series transition elements, lanthanoids, etc. Examples of inorganic fillers containing a Group 13 element include oxides derived from aluminum, boron, indium, etc., and among these, alumina is preferred. Inorganic fillers containing a Group 14 element (excluding carbon) include oxides derived from silicon, tin, etc., and salts thereof, with silica being preferred. Examples of inorganic fillers containing first row transition elements include oxides derived from titanium, manganese, zinc, etc., and these oxides can also be used as light absorbing materials of specific wavelengths. Examples of inorganic fillers containing second-row transition elements include oxides derived from yttrium, zirconium, etc., and these oxides can also be used as light absorbing and fluorescent materials of specific wavelengths. Examples of inorganic fillers containing third series transition elements include oxides derived from hafnium, tantalum, and the like. Examples of inorganic fillers containing lanthanoids include oxides derived from lanthanum, cerium, praseodymium, neodymium, terbium, dysprosium, ytterbium, etc., and these oxides can also be used as light absorbing and fluorescent materials of specific wavelengths. Furthermore, a compound of two or more of these compounds via a chemical bond can also be used.

[0046] The shape of the inorganic filler is not particularly limited, and inorganic fillers of various shapes such as spherical, hollow spherical, porous, plate-like, needle-like, fibrous, etc. Among these, fibrous inorganic fillers are preferred because they are highly effective in suppressing cracks in the ceramic layer formed after combustion and provide particularly good flame retardancy.

[0047] In particular, as the inorganic filler contained in the resin layer (1), it is preferable to use inorganic oxides or silicates containing elements such as silicon, boron, and aluminum, which become ceramic upon combustion and form a fire-resistant layer or a heat-insulating layer. In particular, it is preferable to use a silicon oxide-containing filler such as silica or glass fiber in combination with a phyllosilicate such as clay, as this improves flame retardancy.

[0048] The blending amount of component (C) is 25 to 150 parts by mass per 100 parts by mass of the organopolysiloxane of component (A), above, but 50 to 150 parts by mass is preferred. If it is less than 25 parts by mass, the flame retardancy of the coating film will be insufficient, and if it exceeds 150 parts by mass, the film-forming properties and transparency of the coating film will be poor. The component (C) may be used alone or in combination of two or more types.

[0049] In the resin layer (1), the ratio of the total mass of the components (B) and (C) to the mass of the component (A), [(B) + (C)] / (A), is preferably 1.0 to 4.5, more preferably 1.2 to 4.0, and even more preferably 1.5 to 2.5. When the ratio is 1.0 or more, the flame retardancy is good, and when it is 4.5 or less, the moisture resistance, film-forming property, and transparency of the coating film are good.

[0050] (D) Leveling agent The coating composition for forming the resin layer (1) may contain a leveling agent (D). As the leveling agent, for example, known common leveling agents such as acrylic, vinyl, silicone, fluorine-based leveling agents, etc. Among these, silicone-based leveling agents having a siloxane structure in the main chain are preferred from the viewpoint of enhancing the flame retardancy of the coating composition.

[0051] When component (D) is used, its amount is preferably 1 to 10 parts by mass, more preferably 3 to 6 parts by mass, per 100 parts by mass of the organopolysiloxane of component (A).Within this range, a topcoat layer with excellent film-forming properties can be obtained while maintaining flame retardancy and transparency. The component (D) may be used alone or in combination of two or more types.

[0052] (E) Solvent The coating composition for forming the resin layer (1) may contain a solvent in addition to the above components. The solvent is not particularly limited, but alcohol or water is preferred, and water is more preferred from the viewpoint of environmental conservation and availability.

[0053] When water is used as the solvent, specifically, fresh water such as tap water, industrial water, well water, natural water, rainwater, distilled water, and ion-exchanged water can be used, with ion-exchanged water being particularly preferred. Ion-exchanged water can be produced using a pure water maker (e.g., Organo Corporation, product name "FW-10," Merck Millipore, product name "Direct-QUV3," etc.).

[0054] When a solvent is used, the amount blended is preferably 20 to 80% by mass, more preferably 30 to 60% by mass, of the total paint composition. When the solvent is contained in an amount of 20% by mass or more of the total composition, the fluidity and workability of the paint are improved, and when the solvent is contained in an amount of 80% by mass or less of the total composition, the concentration of the active ingredients in the paint is high, making it easier to thicken the paint film.

[0055] The coating composition for forming the resin layer (1) may contain a curing catalyst for the purpose of accelerating the curing reaction. The type, amount, and addition method of the curing catalyst can be determined by known methods and conditions according to the type of composition. Specifically, the following examples of component (v) can be used.

[0056] The coating composition for forming the resin layer (1) may contain additives that exert additional effects, as long as they do not impair the effects of the present invention. Examples of additives include ultraviolet absorbers, anti-termite agents, antioxidants, dyes, pigments, thickeners, and antifoaming agents. These additives may be used alone or in combination of two or more.

[0057] The total content of the above components (A) to (C) relative to the total solid content of the coating composition for forming the resin layer (1) is preferably 70 mass % or more, more preferably 80 mass % or more, and most preferably 90 mass % or more.

[0058] The coating composition for forming the resin layer (1) can be produced by mixing the above components (A) to (C), and, if necessary, the components (D), (E), and other components. The method for mixing the components can be appropriately selected from known methods and is not particularly limited. Examples of devices that can be used for mixing include a mixer, a shaking device, an ultrasonic homogenizer, a high-pressure homogenizer, a bead mill, and a ball mill. For the purpose of promoting dissolution or dispersion of each component, the mixing operation may be carried out under heating within a range that does not impair the effects of the present invention.

[0059] The coating amount of the resin layer (1) is 100 to 1000 g / m2 relative to the substrate. 2 However, 150 to 800 g / m 2 is preferable, and 200 to 600 g / m 2 It is more preferable that the coating amount is 100 g / m 2 When the coating amount is 1000 g / m or more, the flame retardancy is good. 2 When the thickness is equal to or less than this, the water resistance and appearance are good, and further, excessive expansion of the fire-resistant film during a flame retardancy test can be suppressed. In order to achieve a coating weight within the above range, the coating composition may be applied to the substrate in such a manner that the coating weight of the solid content of the coating composition falls within the above range.

[0060] The conditions for applying the coating composition for forming the resin layer (1) and forming the resin layer (1) may be appropriately set depending on the type and shape of the wood substrate, and the specific conditions can be appropriately selected from known conditions.

[0061] The coating method may be appropriately selected from known techniques, and various coating methods such as brush coating, spraying, dipping, flow coating, roll coating, curtain coating, spin coating, and knife coating can be used. The coating composition for forming the resin layer (1) is, for example, a composition that can form a film at about 0 to 40°C, preferably about 5 to 35°C, but more preferably one that can form a film after 24 hours at 25°C. For the purpose of shortening the curing time, heating may be carried out within a temperature range that does not adversely affect the substrate, etc.

[0062] [3] Resin layer (2) The resin layer (2) (hereinafter sometimes referred to as the topcoat layer) is a resin layer formed by applying a surface protective coating composition onto the resin layer (1) directly or via one or more other layers, and then curing the applied composition. Note that, in the present invention, curing also includes forming a coating film by simply drying the coating composition after applying it to the surface of the wood substrate, without curing it by crosslinking.

[0063] The surface protective coating composition for forming the resin layer (2) is not particularly limited, and known coating materials can be used, specifically coating materials containing one or more resin components selected from the group consisting of acrylic resins, alkyd resins, epoxy acrylate resins, polyester resins, silicone-modified polyester resins, silicone-modified acrylic resins, epoxy resins, polycarbonate resins, silicone resins, fluorine-containing resins, chlorine-based resins, polyolefin resins, urethane resins, and acrylic urethane resins. In particular, urethane curing paints, silicone acrylic paints, fluorine-based paints, and silicone-based paints are preferred because they offer an excellent balance of transparency, weather resistance, water resistance, flame retardancy, and availability.

[0064] As the surface protective coating composition containing these resin components, commercially available room temperature curing coating products may be used. Specific examples thereof include a solventless silicone coating composition (KR-400, manufactured by Shin-Etsu Chemical Co., Ltd.), an oil-based epoxy coating (transparent epoxy rust-preventive coating, manufactured by Nip Home Products Co., Ltd.), a water-based acrylic silicone coating (transparent water-based multi-purpose color, manufactured by Asahipen Co., Ltd.), an oil-based silicone coating (Waterproof No. 1 Clear, manufactured by Nippon Tokushu Toryo Co., Ltd.), a water-based acrylic varnish (transparent water-based varnish, manufactured by Asahipen Co., Ltd.), an oil-based urethane coating (oil-based varnish, manufactured by Washin Paint Co., Ltd.), a water-based urethane coating (aqueous urethane varnish, manufactured by Washin Paint Co., Ltd.), a urethane curing coating (Uretate Floor GFT Glossy, manufactured by Dai Nippon Toryo Co., Ltd.), an acrylic silicone coating (SB Rise Coat Smile, manufactured by Dai Nippon Toryo Co., Ltd.), and a fluorine-based coating (V Flon Sharp 200 Clear Top Coat, manufactured by Dai Nippon Toryo Co., Ltd.).

[0065] The method for applying the surface protective coating composition may be appropriately selected from known techniques, and various coating methods such as brush coating, spraying, dipping, flow coating, roll coating, curtain coating, spin coating, and knife coating can be used. The surface protective coating composition is, for example, a composition that can form a film at about 0 to 40°C, preferably about 5 to 35°C, but more preferably one that can form a film at 25°C after 24 hours. For the purpose of shortening the curing time, heating may be carried out within a temperature range that does not adversely affect the substrate, etc.

[0066] The conditions for applying the surface protective coating composition and forming the resin layer (2) may be appropriately set depending on the type and shape of the wood substrate, and the specific conditions can be appropriately selected from known conditions.

[0067] The coating amount of the resin layer (2) is 5 to 150 g / m2 relative to the substrate. 2 However, 10 to 100 g / m 2 is preferred, and 15 to 90 g / m 2 The coating amount is more preferably 5 g / m2 relative to the substrate. 2When the coating amount is 150 g / m or more, it is possible to suppress water resistance and deterioration of appearance over time, and further to suppress excessive expansion of the fire-resistant film during a flame retardancy test. 2 If it is below this, the flame retardancy is good. In order to achieve a coating weight within the above range, the coating composition may be applied to the substrate in such a manner that the coating weight of the solid content of the coating composition falls within the above range.

[0068] The ratio of the total mass of the component (B) in the resin layer (1) and the active ingredient (C) in the resin layer (1) to the total mass of the component (A) in the resin layer (1) and the active ingredient (F) in the resin layer (2), [(B) + (C)] / [(A) + (F)], is preferably 0.8 to 2.0, more preferably 0.9 to 1.9, and even more preferably 1.0 to 1.8. When the ratio is 0.8 or more, the flame retardancy is good, and when it is 1.9 or less, the moisture resistance, water resistance, film-forming property, and transparency of the coating film are good.

[0069] In the present invention, the active ingredient (F) in the resin layer (2) means all components constituting the resin layer (2) (all solids in the surface protective coating composition excluding the solvent).

[0070] The surface protective coating composition may contain additives that exert additional effects to the extent that the effects of the present invention are not impaired. Examples of additives include leveling agents. Examples of leveling agents that can be used include well-known common leveling agents such as acrylic, vinyl, silicone, and fluorine-based leveling agents. Among these, silicone leveling agents having a siloxane structure in the main chain are preferred in terms of enhancing the flame retardancy of the coated article.

[0071] In addition, examples of additives other than the leveling agent include ultraviolet absorbers, flame retardants, anti-termite agents, antioxidants, dyes, pigments, thickeners, antifoaming agents, and fillers, and these additives may be used alone or in combination of two or more types.

[0072] [4] Resin layer (3) The coated article of the present invention may further have a resin layer (3) (hereinafter sometimes referred to as an undercoat layer) between the surface of the wood substrate and the resin layer (1), either directly or via one or more other layers, which is made of a cured product of a coating composition containing the following components (i) and (ii): (i) An organopolysiloxane having a unit ratio represented by the following formula (II): (ii) Inorganic filler

[0073] (i) Organopolysiloxane Component (i) is an organopolysiloxane composed of units represented by the following formula (II): (R 1 3SiO 1 / 2 ) is expressed as M units, (R 2 2SiO) is expressed as D unit, (R 3 SiO 3 / 2 The unit represented by (SiO2) is called the T unit, and the unit represented by (SiO2) is called the Q unit.

[0074] (R 1 3SiO 1 / 2 ) a (R 2 2SiO) b (R 3 1SiO 3 / 2 ) c (SiO2) d (OR 4 ) e (II)

[0075] In formula (II), R 1 , R 2 and R 3 each independently represents a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, which may be substituted with one or more amino groups, hydroxy groups, epoxy groups, acid anhydride groups, maleimide groups, vinyl groups, allyl groups, acrylic groups, methacrylic groups, or heterocyclic groups, and which may have an ether bond; 1 , R 2 and R 3At least a part of them is an alkyl group having 1 to 20 carbon atoms and substituted with a hydroxy group and optionally having an ether bond, an aryl group having 6 to 20 carbon atoms and substituted with a hydroxy group and optionally having an ether bond, or an aralkyl group having 7 to 20 carbon atoms and substituted with a hydroxy group and optionally having an ether bond.

[0076] The alkyl group having 1 to 20 carbon atoms may be linear, branched, or cyclic, and specific examples thereof include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, n-octyl, n-decyl, cyclopentyl, and cyclohexyl groups, with methyl and ethyl groups being preferred from the viewpoint of increasing the flame retardancy of the coating composition. Examples of the aryl group having 6 to 20 carbon atoms include a phenyl group and a naphthyl group. Examples of the aralkyl group having 7 to 20 carbon atoms include benzyl and phenethyl groups. Examples of heterocyclic groups include piperidinyl, pyridinyl, pyrrolyl, and thienyl groups.

[0077] As described above, in formula (II), R 1 , R 2 and R 3 At least a part of these is an alkyl group having 1 to 20 carbon atoms and substituted with a hydroxy group and optionally having an ether bond, an aryl group having 6 to 20 carbon atoms and substituted with a hydroxy group and optionally having an ether bond, or an aralkyl group having 7 to 20 carbon atoms and substituted with a hydroxy group and optionally having an ether bond. Preferred examples of such a group substituted with a hydroxy group include a 2-hydroxyethyl group, a 3-hydroxypropyl group, a 2,3-dihydroxypropyl group, a 3,4-dihydroxybutyl group, a β-(3,4-dihydroxycyclohexyl)ethyl group, and a group represented by the following formula (III):

[0078] [ka] (In the formula, the wavy line represents a bond.)

[0079] (i) Considering the solubility of the components in water, the affinity with the inorganic filler components and the substrate, etc., R 1 , R 2 and R 3 The total number of hydroxy groups contained in is preferably 50 mol % or more, more preferably 80 mol % or more, and even more preferably 100 mol % or more, based on the total number of silicon atoms in formula (II).

[0080] In addition, R 1 , R 2 and R 3 Among these, as the substituents other than the group substituted with a hydroxy group, a methyl group or an ethyl group, which has a small number of carbon atoms in the combustible alkyl chain, is preferred, and a methyl group is more preferred.

[0081] In formula (II), R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Specific examples of alkyl groups having 1 to 8 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, and n-octyl groups. Among these, R is the most suitable from the viewpoint of flame retardancy of the coating composition. 4 is preferably a hydrogen atom.

[0082] a is a number between 0 and 0.5, b is a number between 0 and 0.5, c is a number between 0.2 and 1.0, and d is a number between 0 and 0.5, and a+b+c+d=1 is satisfied. e is a number from 0 to 3.0, and from the viewpoint of the water solubility of the organopolysiloxane, is preferably a number from 0.1 to 2.0. If e exceeds 3.0, the film-forming properties of the coating composition and the moisture resistance of the coating film may deteriorate.

[0083] The component (i) is preferably one represented by the following formula: (R 30 1SiO 3 / 2 ) c (OR40 ) e

[0084] In the above formula, R 30 are selected from a methyl group, an ethyl group, a 2-hydroxyethyl group, a 3-hydroxypropyl group, a 2,3-dihydroxypropyl group, a 3,4-dihydroxybutyl group, a β-(3,4-dihydroxycyclohexyl)ethyl group, and a group represented by the above formula (III), but at least a part of them are selected from a 2-hydroxyethyl group, a 3-hydroxypropyl group, a 2,3-dihydroxypropyl group, a 3,4-dihydroxybutyl group, a β-(3,4-dihydroxycyclohexyl)ethyl group, and a group represented by the above formula (III), and R 40 is a hydrogen atom. c and e are the same as above.

[0085] The organopolysiloxane of component (i) has undergone a certain degree of condensation, which facilitates network formation and facilitates fixation to the substrate. In addition, it has fewer alkoxy groups, which are a source of flammable gas, than monomer components (such as silane coupling agents) that do not contain siloxane bonds (Si-O-Si bonds), which means that there is less reduction in flame retardancy.

[0086] The amount of the monomer component not containing a siloxane bond is preferably 50% by mass or less, more preferably 30% by mass or less, even more preferably 10% by mass or less, and even more preferably 1% by mass or less, based on the organopolysiloxane of component (i).

[0087] The organopolysiloxane of component (i) can be produced by hydrolysis and condensation of the monomer components of each structural unit in the presence of an acid or base catalyst. Furthermore, by carrying out a deprotection reaction of the protected hydroxy groups as necessary, it is possible to produce an organopolysiloxane having alkyl groups, aryl groups, aralkyl groups, etc. substituted with hydroxy groups.

[0088] Examples of monomers of Q units include tetramethoxysilane, tetraethoxysilane, tetra(n-propoxy)silane, tetra(isopropoxy)silane, tetra(n-butoxy)silane, alkali silicate, and activated silicic acid obtained by cation exchange of alkali silicate.

[0089] Monomers of T units include methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltriisopropoxysilane, propyltrimethoxysilane, propyltriethoxysilane, propyltriisopropoxysilane, phenyltrimethoxysilane, vinyltrimethoxysilane, allyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-acryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β-(3 ,4-epoxycyclohexyl)ethyltrimethoxysilane, γ-chloropropyltrimethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltriethoxysilane, perfluorooctylethyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, γ-isocyanatepropyltrimethoxysilane, γ-isocyanatepropyltriethoxysilane, and the like. Among these, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-acryloxypropyltrimethoxysilane, etc. can be converted into hydroxy group-substituted products by transesterification with water, and γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, etc. can be converted into diol products by reacting the epoxy ring with water, which is preferable because it improves the solubility of the siloxane in water and the affinity with wood and inorganic filler components.

[0090] Examples of monomers of D units include dimethyldimethoxysilane, dimethyldiethoxysilane, methylethyldimethoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, methylpropyldimethoxysilane, methylpropyldiethoxysilane, diisopropyldimethoxysilane, phenylmethyldimethoxysilane, vinylmethyldimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, and N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane. Among these, taking into consideration the solubility of the resulting siloxane in water and the affinity with wood and flame retardant components, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, etc. can be converted into hydroxy group-substituted products by transesterification with water, and γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, etc. can be converted into diol products by reacting the epoxy ring with water, which are preferred because they improve the solubility of the siloxane in water and the affinity with wood and inorganic filler components.

[0091] Monomers of M units include trimethylmethoxysilane, trimethylethoxysilane, triethylmethoxysilane, n-propyldimethylmethoxysilane, n-propyldiethylmethoxysilane, isopropyldimethylmethoxysilane, isopropyldiethylmethoxysilane, isopropyldimethylethoxysilane, n-butyldimethylmethoxysilane, n-butyldimethylethoxysilane, n-hexyldimethylmethoxysilane, n-hexyldimethylethoxysilane, n-pentyldimethylmethoxysilane, n-pentyldimethylethoxysilane, n-hexyldimethylmethoxysilane, n-hexyldimethylethoxysilane, n-decyldimethylmethoxysilane, n-decyldimethylethoxysilane, trimethylsilanol, and trimethylsilanol. triethylsilanol, n-propyldimethylsilanol, n-propyldiethylsilanol, isopropyldimethylsilanol, isopropyldiethylsilanol, n-butyldimethylsilanol, n-hexyldimethylsilanol, n-pentyldimethylsilanol, n-decyldimethylsilanol, γ-aminopropyldimethylmethoxysilane, N-(2-aminoethyl)-3-aminopropyldimethylmethoxysilane, γ-methacryloxypropyldimethylmethoxysilane, γ-methacryloxypropyldimethylethoxysilane, γ-glycidoxypropyldimethylmethoxysilane, γ-glycidoxypropyldimethylethoxysilane, β-(3,4-epoxycyclohexyl)ethyldimethylmethoxysilane, and the like. Among these, taking into consideration the solubility of the resulting organopolysiloxane in water and the affinity with the substrate and flame retardant components, γ-methacryloxypropyldimethylmethoxysilane, γ-methacryloxypropyldimethylethoxysilane, etc. can be converted into hydroxy group-substituted products by a transesterification reaction with water, and γ-glycidoxypropyldimethylmethoxysilane, γ-glycidoxypropyldimethylethoxysilane, β-(3,4-epoxycyclohexyl)ethyldimethylmethoxysilane, etc. can be converted into diol products by reacting the epoxy ring with water, which are preferred because they improve the solubility of the siloxane in water and the affinity with wood and inorganic filler components.

[0092] Since the M units and D units have two or more Si-C bonds and are easily combustible, the content of M units and D units among all the structural units in the organopolysiloxane of component (i) is each 50 mol % or less. That is, in the above formula (II), a is a number from 0 to 0.5, preferably a number from 0 to 0.2, and more preferably a number from 0 to 0.1. Furthermore, b is a number from 0 to 0.5, preferably a number from 0 to 0.2, and more preferably a number from 0 to 0.1.

[0093] T units have one Si-C bond and are less flammable than D units or M units, so by including 20 mol % or more of T units among all the structural units in the organopolysiloxane of component (i), good flame retardancy is achieved. That is, in the above formula (II), c is a number from 0.2 to 1.0, preferably a number from 0.5 to 1.0, and more preferably a number from 0.6 to 1.0.

[0094] Q units do not contain Si-C bonds and have low flammability, and are effective in preventing a decrease in flame retardancy due to combustion resulting from Si-C bonds. On the other hand, Q units have many crosslinking points and are highly reactive, so from the viewpoint of compatibility with flame retardant components and film-forming properties, the Q units are in the range of 0 to 50 mol % of all constitutional units in the organopolysiloxane of component (i), i.e., d is a number from 0 to 0.5, and preferably a number from 0 to 0.4.

[0095] The ratio of each structural unit in the component (i) is, for example, 29 This can be confirmed by a known method using the ratio of the chemical shift and integral value of the Si-NMR signal.

[0096] The content of component (i) is preferably 5 to 50% by mass, more preferably 10 to 30% by mass, based on the total solid content of the coating composition. When it is 5% by mass or more, the film-forming properties and transparency of the coating film are good. When it is 50% by mass or less, the flame retardancy of the coating film and the effect of suppressing poor appearance around knots in the wood substrate are good. The component (i) may be used alone or in combination of two or more types.

[0097] (ii) Inorganic filler As the inorganic filler of component (ii), known general inorganic fillers can be used, and examples thereof include inorganic fillers containing Group 13 elements, Group 14 elements (excluding carbon), first series transition elements, second series transition elements, third series transition elements, lanthanoids, etc. Examples of inorganic fillers containing a Group 13 element include oxides derived from aluminum, boron, indium, etc., and among these, alumina is preferred. Inorganic fillers containing a Group 14 element (excluding carbon) include oxides derived from silicon, tin, etc., and salts thereof, with silica being preferred. Examples of inorganic fillers containing first row transition elements include oxides derived from titanium, manganese, zinc, etc., and these oxides can also be used as light absorbing materials of specific wavelengths. Examples of inorganic fillers containing second-row transition elements include oxides derived from yttrium, zirconium, etc., and these oxides can also be used as light absorbing and fluorescent materials of specific wavelengths. Examples of inorganic fillers containing third series transition elements include oxides derived from hafnium, tantalum, and the like. Examples of inorganic fillers containing lanthanoids include oxides derived from lanthanum, cerium, praseodymium, neodymium, terbium, dysprosium, ytterbium, etc., and these oxides can also be used as light absorbing and fluorescent materials of specific wavelengths. Furthermore, a compound of two or more of these compounds via a chemical bond can also be used.

[0098] There are no particular limitations on the shape of the inorganic filler, and inorganic fillers of various shapes such as spherical, hollow spherical, porous, plate-like, needle-like, and fibrous shapes can be used.

[0099] In particular, as the inorganic filler used in the coating composition for forming the resin layer (3), it is preferable to use inorganic oxides or silicates containing elements such as silicon, boron, aluminum, etc., which become ceramic upon combustion and form a fire-resistant layer or a heat-insulating layer, such as silica, alumina, and phyllosilicates. In particular, it is preferable to use a silicon oxide-containing filler such as silica in combination with a phyllosilicate such as clay, as this improves flame retardancy and the effect of suppressing poor appearance around knots.

[0100] In particular, silica particles having an average particle size calculated based on the BET specific surface area of ​​15 to 100 nm, and more preferably 20 to 80 nm, are preferably used as the inorganic filler used in the coating composition for forming the resin layer 3. If the average particle size is 15 nm or more, the coating film will have excellent film-forming properties, and if it is 100 nm or less, the coating film will have excellent transparency.

[0101] The blending amount of component (ii) is preferably 100 to 900 parts by mass, more preferably 200 to 800 parts by mass, per 100 parts by mass of the organopolysiloxane of component (i). At 100 parts by mass or more, the flame retardancy of the coating film is improved. For example, when the coating composition of the present invention is used as a primer layer on a wooden substrate and then a topcoat layer is formed on top of that, the inorganic filler fills the grain of the surface of the wooden substrate, forming the primer layer, thereby suppressing absorption of the topcoat paint and preventing poor appearance around knots. At 900 parts by mass or less, the coating film formability is improved, resulting in good transparency of the coated article and improved prevention of poor appearance around knots. The component (ii) may be used alone or in combination of two or more types.

[0102] (iii) Flame retardants The coating composition for forming the resin layer (3) may contain, as component (iii), one or more flame retardants selected from phosphorus-based, boron-based, magnesium-based, aluminum-based, nitrogen-based, antimony-based, and halogen-based compounds. Examples of phosphorus compounds include organic phosphorus compounds, phosphoric acid, phosphate esters, and phosphate salts, and specific examples thereof include diammonium hydrogen phosphate, ammonium dihydrogen phosphate, diguanidine phosphate, ammonium polyphosphate, hydrophobized ammonium polyphosphate, guanylurea phosphate, carbamate polyphosphate, and melamine phosphate. Examples of boron compounds include organic boron compounds, boric acid, borax, boron oxide, boric acid esters, and borate salts. Examples of magnesium compounds include magnesium hydroxide and magnesium oxide. The aluminum-based compound may, for example, be aluminum hydroxide. Examples of nitrogen-based compounds include ammonium sulfate, ammonium carbonate, ammonium hydrogen carbonate, and melamine cyanurate. Examples of antimony compounds include antimony trioxide. Examples of halogen compounds include zinc chloride.

[0103] Among these, phosphorus-based compounds and boron-based compounds are preferred as flame retardants used in the coating composition for forming the resin layer (3), as they provide good transparency and flame retardancy of the coated article and good effect in suppressing poor appearance around knots in wood. Specific examples that can be suitably used include diammonium hydrogen phosphate, ammonium dihydrogen phosphate, ammonium polyphosphate, boric acid, borax, and boron oxide.

[0104] When component (iii) is used, the blending amount is preferably 10 to 300 parts by mass, and more preferably 50 to 200 parts by mass, per 100 parts by mass of the organopolysiloxane of component (i) above, from the viewpoint of flame retardancy, film-forming properties, transparency, and moisture resistance of the coating film. The component (iii) may be used alone or in combination of two or more types.

[0105] When component (iii) is used, in the coating composition for forming the resin layer (3), the ratio of the total mass of components (ii) and (iii) to the mass of component (i), [(ii) + (iii)] / (i), is preferably 1.0 to 10.0, more preferably 2.0 to 9.0, and even more preferably 3.0 to 8.0. When the ratio is 1.0 or more, the flame retardancy is good, and when it is 10.0 or less, the moisture resistance, film-forming property, and transparency of the coating film are good.

[0106] (iv) Solvent The coating composition for forming the resin layer (3) may contain a solvent in addition to the above components (i) to (iii). The solvent is not particularly limited, but alcohol or water is preferred, and water is more preferred from the viewpoints of environmental conservation and easy availability.

[0107] When water is used as the solvent, specifically, fresh water such as tap water, industrial water, well water, natural water, rainwater, distilled water, and ion-exchanged water can be used, with ion-exchanged water being particularly preferred. Ion-exchanged water can be produced using a pure water maker (e.g., Organo Corporation, product name "FW-10," Merck Millipore, product name "Direct-QUV3," etc.).

[0108] When a solvent is used, the amount blended is preferably 20 to 98% by mass, more preferably 70 to 95% by mass, of the total paint composition. When the solvent is contained in an amount of 20% by mass or more of the total composition, the fluidity and workability of the paint are improved, and when the solvent is contained in an amount of 98% by mass or less of the total composition, the concentration of the active ingredients in the paint is high, making it easier to thicken the paint film.

[0109] (v) Curing catalyst The coating composition for forming the resin layer 3 may contain a curing catalyst for the purpose of accelerating the curing reaction. The type, amount, and addition method of the curing catalyst may be determined by known methods and conditions according to the type of composition. In particular, when the coating composition contains a component that cures by a chemical reaction in the presence of a catalyst, the coating composition preferably contains a curing catalyst. Examples of the curing catalyst include basic compounds such as lithium hydroxide, sodium hydroxide, potassium hydroxide, sodium methylate, sodium propionate, potassium propionate, sodium acetate, potassium acetate, sodium formate, potassium formate, trimethylbenzylammonium hydroxide, tetramethylammonium hydroxide, tetramethylammonium acetate, n-hexylamine, tributylamine, diazabicycloundecene (DBU), and dicyandiamide; metal-containing compounds such as tetraisopropyl titanate, tetrabutyl titanate, titanium acetylacetonate, aluminum triisobutoxide, aluminum triisopropoxide, tris(acetylacetonate)aluminum, diisopropoxy(ethylacetoacetate)aluminum, aluminum perchlorate, aluminum chloride, cobalt octylate, cobalt acetylacetonate, iron acetylacetonate, tin acetylacetonate, dibutyltin octylate, and dibutyltin laurate; and acidic compounds such as p-toluenesulfonic acid and trichloroacetic acid. Among these, sodium propionate, sodium acetate, sodium formate, trimethylbenzylammonium hydroxide, tetramethylammonium hydroxide, tris(acetylacetonato)aluminum, diisopropoxy(ethylacetoacetate)aluminum, etc. are particularly preferred, and metal-containing compounds such as aluminum-based catalysts, titanium-based catalysts, and tin-based catalysts containing organic ligands are particularly preferred.

[0110] The coating composition for forming the resin layer (3) may contain additives that exert additional effects, provided that the effects of the present invention are not impaired. Examples of additives include leveling agents. Examples of leveling agents that can be used include well-known, commonly used leveling agents, such as acrylic, vinyl, silicone, and fluorine-based leveling agents. Among these, silicone leveling agents having a siloxane structure in the main chain are preferred in terms of enhancing the flame retardancy of the coated article.

[0111] In addition, examples of additives other than the leveling agent include ultraviolet absorbers, anti-termite agents, antioxidants, dyes, pigments, etc., and these additives may be used alone or in combination of two or more types.

[0112] In the coating composition for forming the resin layer (3), the total content of the above components (i) to (iii) relative to the total solid content is preferably 70 mass % or more, more preferably 80 mass % or more, and most preferably 90 mass % or more.

[0113] The coating composition for forming the resin layer (3) can be produced by mixing the above components (i) and (ii), and, if necessary, components (iii), (iv), (v), and other components. The method for mixing the components can be appropriately selected from known methods and is not particularly limited. Examples of devices that can be used for mixing include a mixer, a shaking device, an ultrasonic homogenizer, a high-pressure homogenizer, a bead mill, and a ball mill. For the purpose of promoting dissolution or dispersion of each component, the mixing operation may be carried out under heating within a range that does not impair the effects of the present invention.

[0114] The conditions for applying and drying the coating composition for forming the resin layer (3) to the wood substrate may be appropriately determined depending on the type and shape of the wood substrate, etc. Specific conditions can be appropriately selected from known conditions.

[0115] The coating amount of the resin layer (3) is 5 to 100 g / m2 relative to the substrate. 2 is preferable, and 10 to 50 g / m 2 The coating amount is more preferably 5 g / m2 relative to the substrate. 2 When the coating amount is 100 g / m or more, the influence of the surface condition of the wood substrate is reduced, and it becomes easier to consistently obtain good appearance and flame retardancy. 2 If it is below this, the flame retardancy is good. In order to achieve a coating weight within the above range, the coating composition may be applied to the substrate in such a manner that the coating weight of the solid content of the coating composition falls within the above range.

[0116] The method for applying the coating composition to form the resin layer (3) may be appropriately selected from known methods, and various coating methods such as brush coating, spraying, dipping, flow coating, roll coating, curtain coating, spin coating, and knife coating can be used. The coating composition for forming the resin layer (3) is, for example, a composition that can form a film at about 0 to 40°C, preferably about 5 to 35°C, but more preferably one that can form a film after 24 hours at 25°C. For the purpose of shortening the curing time, heating may be carried out within a temperature range that does not adversely affect the substrate, etc.

[0117] In the present invention, the resin layer (1), the resin layer (2), and the resin layer (3) may be formed on a part of the surface of the substrate or on the entire surface. For example, in the case of a plate-like substrate, a coating layer may be formed on at least one surface thereof.

[0118] The ratio of the total mass of the (B) component in the resin layer (1), the (C) component in the resin layer (1), and the (ii) and (iii) components in the resin layer (3) to the total mass of the (A) component in the resin layer (1), the (i) component in the resin layer (3), and the active ingredient (F) in the resin layer (2), [(B) + (C) + (ii) + (iii)] / [(A) + (F) + (i)], is preferably 0.9 to 2.0, more preferably 1.0 to 1.9, and even more preferably 1.1 to 1.8. When this ratio is 0.9 or more, the flame retardancy is good, and when it is 2.0 or less, the moisture resistance, water resistance, film-forming ability, and transparency of the coating film are good. [Example]

[0119] The present invention will be explained in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0120] [1] Preparation of primer layer coating composition (3-1) [Synthesis Example 1] Hydroxy group-containing organopolysiloxane [component (i)], in the above formula (II), a=0, b=0, c=1.0, d=0, e=0.7, R 3 = methyl group, a group represented by the following formula (III), R 4 = hydrogen atoms, hydroxyl group substitution amount (relative to total silicon atoms) = 200 mol%], 300.0 g of Snowtex OL [(ii) component, 20 mass% silica aqueous dispersion, particle size 45 nm, Nissan Chemical Industries Co., Ltd.], 60.0 g of BENTONE-EW NA [(ii) component, hectorite clay, Elementis Specialties, Inc.], 48.0 g of Nonnen W2-50 [(iii) component, 50 mass% aqueous solution of phosphorus-nitrogen-based flame retardant, Maruzen Yuka Kogyo Co., Ltd.], and 24.0 g of boric acid [(iii) component, Fujifilm Wako Pure Chemical Industries Co., Ltd.] were mixed to prepare a water-based primer layer coating composition (3-1). The solids ratio of the coating composition was 100 parts by mass of component (i), 400 parts by mass of component (ii), and 160 parts by mass of component (iii).

[0121] [ka] (In the formula, the wavy line represents a bond.)

[0122] [2] Preparation of intermediate layer coating composition (1-1) [Synthesis Example 2] Amino group-containing organopolysiloxane [component (A), in the above formula (I), f = 0, g = 0, h = 0.7, i = 0.3, j = 0.7, R 7 = methyl group, N-(2-aminoethyl)-3-aminopropyl group, R 8= hydrogen atoms, amine substitution amount (relative to total silicon atoms) = 61 mol%], 56.0 g of a 30% by weight aqueous solution of Nonene W2-50 [(B) component, 50% by weight aqueous solution of phosphorus-nitrogen-based flame retardant, manufactured by Maruzen Yuka Kogyo Co., Ltd.], 16.7 g of Taien K [(B) component, water-insoluble ammonium polyphosphate powder, manufactured by Pacific Industrial Co., Ltd.], 13.6 g of EPH80M0-01N [(C) component, glass fiber, manufactured by Nippon Electric Glass Co., Ltd.], and 0.9 g of BYK3450 (leveling agent, polyether-modified polydimethylsiloxane, manufactured by BYK Japan Co., Ltd.) were mixed to prepare intermediate layer coating composition (1-1). The solids ratio of each component in the solution was 131 parts by weight of component (B) and 76 parts by weight of component (C) per 100 parts by weight of component (A).

[0123] [3] Coating composition for topcoat layer (2-1): Urethane Floor GFT Gloss (urethane curing paint, manufactured by Dai Nippon Paint Co., Ltd.) (2-2): SB Rise Coat Smile (acrylic silicone paint, manufactured by Dai Nippon Paint Co., Ltd.) (2-3): V-Flon #200 clear top coat (fluorine-based paint, manufactured by Dai Nippon Paint Co., Ltd.)

[0124] [4] Preparation and evaluation of coated wood [Examples 1 to 7, 9, and 10, and Comparative Examples 3 and 4] To cypress wood (air-dry specific gravity 0.27-0.49) cut to a size of 99 mm x 99 mm x 25 mm with a moisture content of 20% or less, the primer layer coating composition and the intermediate layer coating composition were spray-coated in that order to achieve the coating amount (cured film mass) shown in Tables 1 and 2, and then air-dried for 2 hours to allow curing. The topcoat layer coating composition was then spray-coated to achieve the coating amount shown in Tables 1 and 2, and cured at a temperature of 21-25°C and a relative humidity of 45-55% RH until a constant mass was reached, producing coated wood laminated in the following order: cypress wood / resin layer (3) / resin layer (1) / resin layer (2). The component (F) shown in Tables 1 and 2 means all components constituting the resin layer (2) (all solids in the coating composition for the top coat layer).

[0125] [Example 8] Except for not applying the coating composition for the primer layer, the same operations as in Examples 1 to 7, 9, and 10 and Comparative Examples 3 and 4 were carried out to prepare coated wood materials laminated in the order of cypress wood / resin layer (1) / resin layer (2).

[0126] [Comparative Example 1] Except for not applying the coating composition for the primer layer and the coating composition for the intermediate layer, the same operations as in Examples 1 to 7, 9, and 10 and Comparative Examples 3 and 4 were carried out to prepare coated wood laminated in the order of cypress wood / resin layer (2).

[0127] [Comparative Examples 2 and 5] Except for not applying the coating composition for the top coat layer, the same operations as in Examples 1 to 7, 9, and 10 and Comparative Examples 3 and 4 were carried out to prepare coated wood materials laminated in the order of cypress wood / resin layer (3) / resin layer (1).

[0128] The resulting coated wood was subjected to the following tests. (1) Surface appearance The appearance of the coating on the cypress wood was visually evaluated according to the following criteria. The results are shown in Tables 1 and 2. 〇: The coating is transparent and the wood grain can be seen ×: The coating is cloudy and the wood grain cannot be seen. (2) Moisture resistance Each coated wood was subjected to five cycles of wet-drying, with one cycle consisting of 40°C, 90% RH (24 hours) followed by 60°C air drying (24 hours), and then allowed to cool at 20°C, 60% RH for 24 hours. The condition of the coating surface was then observed and visually evaluated according to the following criteria. The results are shown in Tables 1 and 2. 〇: No whitening, deliquescence, discoloration, etc. ×: Whitening, deliquescence, discoloration, etc. (3) Water resistance Tap water was dropped onto the coating surface, and the surface was covered with a watch glass. After a predetermined time had passed, the watch glass and tap water were removed, and the coating appearance was visually evaluated according to the following criteria. The results are shown in Tables 1 and 2. ◎: No whitening, deliquescence, discoloration, etc. is observed after one week has passed since the watch glass was covered. ○: No whitening, deliquescence, discoloration, etc. is observed after one day has passed since the watch glass was covered. ×: Whitening, deliquescence, discoloration, etc. observed one day after covering with a watch glass (4) Flame retardancy Radiant heat intensity of each coated wood is 50kW / m 2 A cone calorimeter test (ISO-5660-1) was carried out, and the flame retardancy was evaluated according to the following criteria. ◎: Total heat generation after 10 minutes of heating is 8 (MJ / m 2 ) or less 〇: Total heat generation after 5 minutes of heating is 8 (MJ / m 2 ) or less ×: The total calorific value after 5 minutes of heating is 8 (MJ / m 2 ) and / or the coating expands and comes into contact with the device (igniter)

[0129] [Table 1]

[0130] [Table 2]

[0131] As shown in Table 1, the coated wood materials of Examples 1 to 10, which met the requirements of the present invention, had good coating appearance and water resistance, and also had a small total heat release during combustion, demonstrating flame retardancy that met the standards for flame-retardant wood. In contrast, as shown in Table 2, in Comparative Example 1 which did not have the resin layer (1), the flame retardancy was significantly deteriorated. Furthermore, in Comparative Examples 2, 3 and 5, which did not have the resin layer (2) or had a small amount of resin layer (2) applied, the water resistance deteriorated. In particular, in Comparative Example 5, which did not have the resin layer (2) and had a large amount of resin layer (1) applied, the film swelled significantly during the combustion test, and the film came into contact with part of the test equipment, resulting in the test being unsuccessful. On the other hand, in Comparative Example 4, in which the amount of resin layer (2) coated was excessive, the flame retardancy deteriorated due to an increase in combustible organic components, resulting in failure to meet the standards for flame retardant wood.

[0132] From the above, it is believed that by providing a predetermined coating amount of resin layer (1), it is possible to form a sturdy ceramic layer during combustion, and that its fire resistance and heat insulation effects greatly improve the flame retardancy of the wood base material. Furthermore, by providing a resin layer (2) on the resin layer (1) with a predetermined coating amount, sufficient water resistance is achieved. In addition, even when a flammable cured material is laminated as the resin layer (2), the expansion of the coating film during combustion is suppressed, resulting in a beneficial effect in improving the flame retardancy of the wood substrate.

Claims

1. A coated article having a resin layer (1) formed on at least a portion of the surface of a wood substrate, directly or via one or more other layers, the resin layer (1) being made of a cured product of a coating composition comprising the following components (A), (B), and (C): The coating amount of the resin layer (1) is 100 to 1000 g / m2 relative to the wood substrate. 2 and the coating amount of the resin layer (2) is 5 to 150 g / m2 with respect to the wood substrate. 2 A coated article. (A) 100 parts by mass of an organopolysiloxane composed of units represented by the following formula (I): (R 5 3 SiO 1 / 2 ) f (R 6 2 SiO) g (R 7 1 SiO 3 / 2 ) h (SiO 2 ) i (OR 8 ) j (I) (In the formula, R 5 , R 6 and R 7 each independently represents a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, which may be substituted with one or more amino groups, hydroxy groups, epoxy groups, acid anhydride groups, maleimide groups, vinyl groups, allyl groups, acrylic groups, methacrylic groups, or heterocyclic groups, and 5 , R 6 and R 7 at least a part of which is an alkyl group having 1 to 20 carbon atoms substituted with an amino group, an aryl group having 6 to 20 carbon atoms substituted with an amino group, or an aralkyl group having 7 to 20 carbon atoms substituted with an amino group, 8 are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, f is 0 to 0.5, g is 0 to 0.5, h is 0.2 to 1.0, i is 0 to 0.5, and j is a number that satisfies 0 to 3.0, and f+g+h+i=1. (B) One or more flame retardants selected from phosphorus-based, boron-based, magnesium-based, aluminum-based, nitrogen-based, antimony-based, and halogen-based compounds: 50 to 300 parts by mass (C) Inorganic filler: 25 to 150 parts by mass

2. 2. The coated article according to claim 1, wherein the surface protective coating composition forming the resin layer (2) is at least one selected from the group consisting of urethane curing coatings, silicone acrylic coatings, fluorine-based coatings and silicone coatings.

3. 2. The coated article according to claim 1, wherein the ratio of the total mass of the component (B) and the active ingredient (C) to the total mass of the component (A) and the active ingredient (F) in the resin layer (2), [(B) + (C)] / [(A) + (F)], is 0.8 to 2.

0.

4. A resin layer (3) made of a cured product of a coating composition containing the following components (i) and (ii) is further coated between the surface of the wood substrate and the resin layer (1) directly or via one or more other layers, in an amount of 5 to 100 g / m2 based on the wood substrate: 2 2. The coated article of claim 1, wherein: (i) 100 parts by mass of an organopolysiloxane composed of units represented by the following formula (II): (R 1 3 SiO 1 / 2 ) a (R 2 2 SiO) b (R 3 1 SiO 3 / 2 ) c (SiO 2 ) d (OR 4 ) e (II) (In the formula, R 1 , R 2 and R 3 each independently represents a hydrogen atom, or an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, which may be substituted with one or more amino groups, hydroxy groups, epoxy groups, acid anhydride groups, maleimide groups, vinyl groups, allyl groups, acrylic groups, methacrylic groups, or heterocyclic groups, and which may have an ether bond; 1 , R 2 and R 3 at least a part of which is an alkyl group having 1 to 20 carbon atoms and which is substituted with a hydroxy group and which may have an ether bond, an aryl group having 6 to 20 carbon atoms and which is substituted with a hydroxy group and which may have an ether bond, or an aralkyl group having 7 to 20 carbon atoms and which is substituted with a hydroxy group and which may have an ether bond, 4 are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, a is 0 to 0.5, b is 0 to 0.5, c is 0.2 to 1.0, d is 0 to 0.5, and e is a number that satisfies the relationship a+b+c+d=1. (ii) Inorganic filler: 100 to 900 parts by mass

5. 5. The coated article according to claim 4, wherein the coating composition further comprises (iii) one or more flame retardants selected from phosphorus-, boron-, magnesium-, aluminum-, nitrogen-, antimony-, and halogen-based compounds in an amount of 10 to 300 parts by mass per 100 parts by mass of component (i).

6. 6. The coated article according to claim 5, wherein the ratio of the total mass of the component (B), the component (C), the components (ii) and (iii) in the resin layer (3) to the total mass of the component (A), the component (i) in the resin layer (3), and the active ingredient (F) in the resin layer (2), [(B) + (C) + (ii) + (iii)] / [(A) + (F) + (i)], is 0.9 to 2.0.

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