Decorative finishing method

Abstract

To obtain decorative finish which can be applied to a wide variety of bases and can exhibit stable performance in adhesion and so on.SOLUTION: In a decorative finishing method for coating a base with an undercoating material and a finish coating material, the undercoating material contains an epoxy resin, an amine hardener, a pigment, and a non-aqueous solvent, a pigment volume concentration is 1 to 30%, the non-aqueous solvent contains a non-aqueous solvent having an aniline point of 12 to 70°C, a compounding ratio of the epoxy resin and the amine hardener satisfies a relationship of [(a compounding amount of the amine hardener / an active hydrogen equivalent amount of the amine hardener) / (a compounding amount of the epoxy resin / an epoxy equivalent amount of the epoxy resin)] and is 1.0 or less, and shows bending resistance with a mandrel diameter of 5 mm or less in a bending resistance test by a cylindrical mandrel method.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a novel decorative finishing method. [Background technology]

[0002] When applying a decorative finish to buildings, civil engineering structures, etc., a primer is applied to the various substrates that make up the structure as a covering material to ensure adhesion, and then a topcoat is applied.

[0003] Recently, there are many cases where painting is applied to existing coating surfaces (old coating surfaces) that have deteriorated over time. In such cases, a primer is selected and applied according to the deterioration state of the existing coating surface to ensure adhesion, and then a topcoat is applied.

[0004] The primer used here plays a major role in improving the adhesion of the finishing coating material to the substrate or existing coating surface (hereinafter collectively referred to as the "base").

[0005] Conventionally, an appropriate undercoat material has been selected according to the type and condition of the substrate. For example, epoxy-based undercoat materials as described in Patent Documents 1 and 2 are one of the undercoat materials that have been widely used. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2000-319582 A [Patent Document 2] Japanese Patent Application Publication No. 11-199648 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in recent years, the number of types of base coats has increased in line with the diversification of buildings and civil engineering structures, making the selection of primers more complicated. On the other hand, there is a risk that the physical properties of finishing coating materials, such as adhesion, may be adversely affected by the conditions (e.g., time, temperature, etc.) between the application of the primer and the application of the finishing coating material.

[0008] The present invention has been made in consideration of the above problems, and has as its object to provide a decorative finish that can be applied to a wide variety of substrates and exhibits stable performance in terms of adhesion, etc. [Means for solving the problem]

[0009] As a result of intensive research into achieving the above object, the inventors came up with the idea of ​​a decorative finishing method in which a specific undercoat material and a topcoat material are applied to a substrate, and completed the present invention.

[0010] That is, the present invention has the following features. 1. A decorative finishing method in which a primer and a topcoat are applied to a substrate, The undercoat material contains an epoxy resin, an amine curing agent, a pigment, and a non-aqueous solvent, The pigment volume concentration is 1 to 30%, The non-aqueous solvent contains a non-aqueous solvent having an aniline point of 12 to 70° C., The pigment is titanium oxide and talc, or titanium oxide, talc and ground calcium carbonate, a compounding ratio of the epoxy resin to the amine curing agent, expressed as [(amount of amine curing agent / active hydrogen equivalent of amine curing agent) / (amount of epoxy resin / epoxy equivalent of epoxy resin)], is 1.0 or less; In bending resistance tests using a cylindrical mandrel method, the product exhibits bending resistance of 5 mm or less in mandrel diameter. A cosmetic finishing method comprising the steps of: 2. The decorative finishing method according to claim 1, wherein the non-volatile content of the primer is 30 to 90% by weight. 3. The decorative finishing method according to 1., wherein the epoxy resin contains a dimer acid modified epoxy resin, and the ratio of the dimer acid modified epoxy resin in the epoxy resin is 50% by weight or more. 4. The decorative finishing method according to claim 1, wherein the amine hardener comprises an aliphatic amine hardener. 5. A decorative finishing method according to any one of 1. to 4., characterized in that the finishing coating material is an elastic finishing coating material. Effect of the Invention

[0011] According to the present invention, a decorative finish can be obtained that can be applied to a wide variety of substrates and exhibits stable performance in terms of adhesion and the like. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [Base] The present invention can be used for decorative finishing of walls (inner wall surfaces, outer wall surfaces, etc.), floor surfaces, ceiling surfaces, etc. of buildings and civil engineering structures. Specifically, the present invention can be applied to substrates such as mortar, concrete, ceramic siding boards, ceramic siding boards, metal siding boards, extrusion molding boards, slate boards, calcium silicate boards, ALC boards, metals, wood, glass, ceramics, synthetic resins, etc., or a wide variety of existing coating films formed on such substrates (substrate surfaces). The shapes of such substrates (substrates and existing coating films) include, for example, flat ones and ones with various uneven patterns (for example, stone-like, brick / tile-like, wood-grain-like, border-like, plaster-like, spray-applied, etc.).

[0013] The present invention can also be applied to a base including a sealing joint. Examples of the sealant constituting the sealing joint include silicone-based sealant, modified silicone-based sealant, polysulfide-based sealant, modified polysulfide-based sealant, acrylic urethane-based sealant, polyurethane-based sealant, SBR-based sealant, and butyl rubber-based sealant. The sealing joint may be made of an elastic dry joint material.

[0014] The present invention can also be applied to the repair (repainting) of existing coating surfaces that have deteriorated over time. The degree of deterioration of the existing coating surface is not particularly limited, but any surface that has been used for approximately 5 years or more (even 8 years or more) after the coating film is formed can be a target for painting.

[0015] If the existing coating surface to be painted includes a sealing joint, the existing sealant may be left as is, or new sealant may be poured before painting the primer.

[0016] The existing coating film is a coating film that has already been applied on the substrate by on-site painting or factory painting (line painting), and examples thereof include at least one coating film selected from organic coating films, inorganic coating films, and organic-inorganic composite coating films. Examples of the existing coating film include colored coating films (enamel coating films, printed coating films, etc.), clear coating films, and laminated coating films thereof, and are coating films formed by applying various coating materials to the substrate. Such coating materials may be, for example, any of room temperature drying type, room temperature curing type, bake curing type, ultraviolet (UV) curing type, and electron beam curing type. Such coating materials may be, for example, any of elastic type and hard type.

[0017] Examples of binders for such coating materials include organic binders such as acrylic resin, polyurethane resin, epoxy resin, fluororesin, alkyd resin, and polyester resin; inorganic binders such as silicone resin, alkoxysilane, colloidal silica, and silicate; and organic-inorganic composite binders such as acrylic silicone resin.

[0018] The present invention can also be applied to cases where the existing coating film is one or more selected from inorganic coating films (coating films containing the above-mentioned inorganic binders), organic-inorganic composite coating films (coating films containing the above-mentioned organic-inorganic composite binders), fluororesin coating films (coating films containing the above-mentioned fluororesins), etc. Such existing coating films may contain photocatalytic titanium oxide, etc.

[0019] In the present invention, such a base can be subjected to treatments such as cleaning and base preparation, if necessary, before the application of the undercoat material.

[0020] [Undercoat material] In the present invention, a specific undercoat material containing an epoxy resin, an amine curing agent, a pigment, and a non-aqueous solvent is applied to the above-mentioned base.

[0021] The epoxy resin and the amine curing agent undergo a curing reaction during the formation of the coating film and act as a resin component. Among these, examples of the epoxy resin include flexible epoxy resins and rigid epoxy resins, and in the present invention, an embodiment containing at least a flexible epoxy resin is preferable.

[0022] Examples of flexible epoxy resins include aliphatic modified epoxy resins, butadiene-based epoxy resins, ε-caprolactone modified epoxy resins, thiol-based epoxy resins, amine modified epoxy resins, rubber modified epoxy resins, urethane modified epoxy resins, polyol modified epoxy resins, and fatty acid modified epoxy resins. These can be used alone or in combination of two or more. Among these, fatty acid modified epoxy resins are preferred.

[0023] The ratio of flexible epoxy resin in the epoxy resin of the undercoat material of the present invention (converted into solid content) is preferably 50% by weight or more, more preferably 70 to 100% by weight, from the viewpoints of conformability to the base and adhesion.

[0024] The fatty acid modified epoxy resin is obtained by addition reaction of an aliphatic polybasic acid compound to an epoxy resin. For the addition reaction, for example, an esterification reaction can be used. As the epoxy resin used here, for example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, and various epoxy resins such as those exemplified in the hard epoxy resin described below can be used. As the aliphatic polybasic acid compound, for example, maleic acid, maleic anhydride, fumaric acid, itaconic acid, itaconic anhydride, citraconic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydrophthalic anhydride, cyclohexane dicarboxylic acid, succinic acid, malonic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, 1,12-docane diacid, dimer acid, etc. can be mentioned. Among these, dimer acid is preferable.

[0025] Dimer acid is a dimer of an unsaturated fatty acid. Examples of unsaturated fatty acids constituting dimer acid include oleic acid, elaidic acid, cetoleic acid, sorbic acid, linoleic acid, linoleic acid, arachidonic acid, soybean oil fatty acid, tall oil fatty acid, and linseed oil fatty acid.

[0026] The dimer acid modified epoxy resin obtained by adding dimer acid to epoxy resin is suitable as the epoxy resin of the undercoat material of the present invention.The ratio (solid content equivalent) of dimer acid modified epoxy resin in the epoxy resin of the undercoat material of the present invention is preferably 50% by weight or more, more preferably 70-100% by weight, from the viewpoint of conformability to the base, adhesion, etc.

[0027] Examples of hard epoxy resins include bisphenol type epoxy resins such as bisphenol A type epoxy resins and bisphenol F type epoxy resins, phenol novolac type epoxy resins such as phenol novolac type bisphenol A epoxy resins and phenol novolac type bisphenol F epoxy resins, novolac type epoxy resins such as cresol novolac type epoxy resins and bisphenol A novolac type epoxy resins, alicyclic epoxy resins, hydrogenated bisphenol A type epoxy resins, glycidyl ether type epoxy resins, bisphenol S type epoxy resins, biphenyl type epoxy resins, dicyclo type epoxy resins, naphthalene type epoxy resins, etc. These can be used alone or in combination of two or more.

[0028] The epoxy resin used in the present invention has an epoxy equivalent (per solid content) of preferably 300 to 3000 g / eq, more preferably 400 to 2000 g / eq, further preferably 450 to 1500 g / eq, and particularly preferably 500 to 1100 g / eq. When the epoxy equivalent is equal to or more than the above lower limit, it is suitable in terms of conformability to the substrate, adhesion, etc. When the epoxy equivalent is equal to or less than the above upper limit, it is suitable in terms of blister resistance, adhesion, suitability as a finishing coating material, etc. The epoxy equivalent is the value obtained by dividing the molecular weight of the epoxy resin by the number of epoxy groups. In the present invention, "α to β" is synonymous with "α or more and β or less".

[0029] Examples of the amine curing agent include polyamine compounds such as aliphatic polyamines, alicyclic polyamines, aromatic polyamines, heterocyclic polyamines, aliphatic polyamides, alicyclic polyamides, aromatic polyamides, aliphatic polyamidoamines, alicyclic polyamidoamines, and aromatic polyamidoamines. These can be used alone or in combination of two or more. In the present invention, among these, one or more aliphatic amine curing agents selected from aliphatic polyamines, aliphatic polyamides, and aliphatic polyamidoamines can be preferably used.

[0030] The amine curing agent used in the present invention has an active hydrogen equivalent (per solid content) of preferably 40 to 200 g / eq, more preferably 50 to 120 g / eq, and even more preferably 60 to 95 g / eq. By having the active hydrogen equivalent within the above range, sufficient effects can be obtained in terms of adhesion, etc. The active hydrogen equivalent is a value obtained by dividing the molecular weight of the amine curing agent by the number of hydrogen atoms of the amino group.

[0031] In the present invention, for such epoxy resin and amine curing agent, each material can be set and used so that the active hydrogen equivalent of the amine curing agent and the epoxy equivalent of the epoxy resin are preferably less than 0.4, more preferably 0.01 to 0.3, even more preferably 0.03 to 0.25, and particularly preferably 0.05 to 0.2, in terms of [active hydrogen equivalent of amine curing agent / epoxy equivalent of epoxy resin]. By using a combination of materials that satisfy such conditions as the epoxy resin and the amine curing agent, more preferable effects can be obtained in terms of adhesion, etc.

[0032] The compounding ratio of the epoxy resin and the amine curing agent is 1.0 or less, preferably 0.3 to 1.0, more preferably 0.5 to 0.98, even more preferably 0.6 to 0.95, and particularly preferably 0.7 to 0.9. The compounding amount and active hydrogen equivalent of the amine curing agent, and the compounding amount and epoxy equivalent of the epoxy resin are all based on the solid content. By the compounding ratio of the epoxy resin and the amine curing agent being equal to or less than the upper limit, it is suitable in terms of adhesion, base followability, suitability for finishing coating materials, etc., and by being equal to or more than the lower limit, it is suitable in terms of curing properties, adhesion, etc. In the present invention, by using the epoxy resin and the amine curing agent at such a compounding ratio, it is possible to suppress the decrease in adhesion due to conditions (e.g., time, temperature, etc.) until the finishing coating material is applied after the undercoat material is applied, and it is possible to improve the suitability for finishing coating materials.

[0033] In the present invention, the pigment is a component that contributes to adhesion etc. As the pigment, for example, a coloring pigment, an extender pigment, an anti-rust pigment, etc. can be used.

[0034] Specific examples of color pigments include titanium oxide, zinc oxide, aluminum oxide, carbon black, graphite, black iron oxide, iron-chromium composite oxide, manganese-bismuth composite oxide, manganese-yttrium composite oxide, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, copper-manganese-chromium composite oxide, red oxide, molybdate orange, permanent red, permanent carmine, anthraquinone red, perylene red, quinacridone red, yellow iron oxide, titanium yellow, fast yellow, benzimidazolone yellow, chrome green, cobalt green, phthalocyanine green, ultramarine blue, Prussian blue, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, aluminum pigments, and pearl pigments. These can be used alone or in combination of two or more.

[0035] Examples of extender pigments include heavy calcium carbonate, light calcium carbonate, kaolin, clay, china clay, diatomaceous earth, hydrous fine powder of silicic acid, talc, baryte powder, barium sulfate, precipitated barium sulfate, barium carbonate, magnesium carbonate, silica powder, aluminum hydroxide, etc. These can be used alone or in combination of two or more.

[0036] Examples of the rust-preventive pigment include phosphate compounds such as zinc phosphate, iron phosphate, aluminum phosphate, calcium phosphate, and magnesium phosphate; phosphite compounds such as zinc phosphite, iron phosphite, aluminum phosphite, calcium phosphite, and magnesium phosphite; polyphosphate compounds such as zinc polyphosphate, iron polyphosphate, and aluminum polyphosphate; molybdic acid compounds such as zinc molybdate, aluminum molybdate, calcium molybdate, barium molybdate, and aluminum phosphomolybdate; vanadium compounds such as vanadium oxide; boric acid compounds such as barium borate, barium metaborate, and calcium borate; and cyanamide compounds such as zinc cyanamide and zinc calcium cyanamide. One or more of these can be used.

[0037] The pigment volume concentration of the undercoat material of the present invention is 1 to 30%, preferably 3 to 25%, more preferably 5 to 23%, even more preferably 7 to 20%, and particularly preferably 8 to 15%. By having the pigment volume concentration within the above range, it is possible to form a coating film with excellent adhesion while taking advantage of the shape of the base. For example, when the base has an uneven pattern, the undercoat material can be evenly applied along the unevenness, and it is possible to form a coating film with excellent finish and adhesion while taking advantage of the uneven pattern. In addition, when the base is flat, a uniform coating film with smoothness can be formed, and excellent performance can be exhibited in adhesion and the like. If the pigment volume concentration does not satisfy the above value, it is difficult to obtain the above-mentioned effect. In addition, in the present invention, by having the pigment volume concentration within the above range, it is also possible to enhance the finish coating material suitability, and even if the conditions change after the undercoat material is applied and before the finish coating material is applied, sufficient adhesion and the like can be ensured.

[0038] The pigment volume concentration is the volume percentage of the pigment contained in the dry coating film, and is a value calculated from the weight parts and specific gravity of the resin components (epoxy resin and amine hardener) that make up the primer and the pigment. The specific gravity of the resin components is assumed to be 1.

[0039] Examples of non-aqueous solvents include aliphatic hydrocarbon solvents such as n-heptane, n-hexane, n-pentane, n-octane, n-nonane, n-decane, n-undecane, and n-dodecane, alicyclic hydrocarbon solvents such as methylcyclohexane and ethylcyclohexane, aliphatic hydrocarbon-containing mixed solvents such as mineral spirits, petroleum-based solvents such as petroleum ether, petroleum naphtha, solvent naphtha, and kerosene, as well as isoparaffin-based solvents, alcohol-based solvents, ether-alcohol-based solvents, ether-based solvents, ester-based solvents, ether-ester-based solvents, and ketone-based solvents. These can be used alone or in combination of two or more.

[0040] The undercoat material of the present invention contains a non-aqueous solvent with an aniline point of 12 to 70°C as a non-aqueous solvent. Such a non-aqueous solvent contributes to improving adhesion by penetrating the substrate, slightly swelling or dissolving the existing coating film, etc. As a non-aqueous solvent with an aniline point of 12 to 70°C, for example, one or more selected from aliphatic hydrocarbon-containing mixed solvents such as mineral spirits, petroleum ether, petroleum naphtha, solvent naphtha, kerosene, and the like are suitable. The aniline point is a value measured by the method of JIS K2256.

[0041] The undercoat material of the present invention may contain a silane compound in addition to the above components. In the present invention, the incorporation of a silane compound can further improve adhesion and the like.

[0042] Examples of the silane compound include tetrafunctional alkoxysilane compounds such as tetraethoxysilane, tetramethoxysilane, and tetrabutoxysilane; Trifunctional alkoxysilane compounds such as methyltrimethoxysilane, methyltriethoxysilane, methyltributoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltributoxysilane, propyltrimethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, butyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, and phenyltributoxysilane; Bifunctional alkoxysilane compounds such as dimethyldimethoxysilane, dimethyldiethoxysilane, dimethyldibutoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, dipropyldimethoxysilane, dipropyldiethoxysilane, dibutyldimethoxysilane, dibutyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, diphenyldibutoxysilane, methylphenyldimethoxysilane, and methylphenyldiethoxysilane; Chlorosilane compounds such as tetrachlorosilane, methyltrichlorosilane, ethyltrichlorosilane, propyltrichlorosilane, phenyltrichlorosilane, vinyltrichlorosilane, dimethyldichlorosilane, diethyldichlorosilane, diphenyldichlorosilane, and methylphenyldichlorosilane; Acetoxysilane compounds such as tetraacetoxysilane, methyltriacetoxysilane, phenyltriacetoxysilane, dimethyldiacetoxysilane, and diphenyldiacetoxysilane; silane compounds containing an epoxy group, such as γ-glycidoxypropyl trimoxysilane, γ-glycidoxypropyl triethoxysilane, γ-glycidoxypropyl methyl dimethoxysilane, γ-glycidoxypropyl methyl diethoxysilane, γ-glycidoxypropyl triisopropenyloxysilane, γ-glycidoxypropyl triiminoxysilane, β-(3,4-epoxycyclohexyl)ethylmethyl dimethoxysilane, and an adduct of γ-isocyanatopropyl triisopropenyloxysilane with glycidol; Silane compounds containing an amino group, such as N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and γ-aminopropyltriethoxysilane; Silane compounds containing a (meth)acryloxy group, such as γ-(meth)acryloxypropylmethyldimethoxysilane, γ-(meth)acryloxypropylmethyldiethoxysilane, γ-(meth)acryloxypropyltrimethoxysilane, and γ-(meth)acryloxypropyltriethoxysilane, can be used alone or in combination of two or more.

[0043] In the present invention, it is particularly preferable to use one or more compounds selected from the group consisting of silane compounds containing an epoxy group and silane compounds containing an amino group.

[0044] The mixing ratio of the silane compound is preferably 3% by weight or less, more preferably 0.1 to 2.8 parts by weight, and even more preferably 0.2 to 2.5 parts by weight, based on 100 parts by weight of the solid content of the resin components (epoxy resin and amine curing agent). By using the silane compound in such a range, the adhesion can be further improved, and excellent adhesion can be exhibited not only when the epoxy resin and the amine curing agent are applied immediately after mixing, but also when the epoxy resin and the amine curing agent are applied after mixing and time has passed. The use of the silane compound is also suitable in terms of improving the adhesion to existing coating films such as inorganic coating films, organic-inorganic composite coating films, and fluororesin coating films.

[0045] In the primer material of the present invention, in addition to the above-mentioned components, for example, plasticizers, preservatives, antifungal agents, anti-algae agents, defoamers, leveling agents, pigment dispersants, surfactants, thickeners, anti-settling agents, anti-sagging agents, matting agents, catalysts, curing accelerators, ultraviolet absorbers, light stabilizers, antioxidants, etc. can be mixed as necessary within a range that does not significantly impair the effects of the present invention.

[0046] The undercoat material of the present invention can be manufactured by uniformly stirring and mixing the above-mentioned components by a conventional method. It is desirable that the undercoat material be in the form of a two-liquid type consisting of a base agent containing an epoxy resin and a hardener containing an amine hardener during distribution, and that these are mixed and used when painting.

[0047] The undercoat material of the present invention exhibits bending resistance with a mandrel diameter of 5 mm or less (preferably 4 mm or less, more preferably 3 mm or less) in a bending resistance test using a cylindrical mandrel method. Due to such characteristics, the suitability of adhesion, conformability, etc. to a wide range of substrates is improved, and for example, sufficient performance can be exhibited even for substrates including sealing joints.

[0048] The cylindrical mandrel method is measured according to the method specified in JIS K5600-5-1:1999 "General test methods for paints - Part 5: Mechanical properties of coatings - Section 1: Bending resistance (cylindrical mandrel method)". The test plate is a polished steel plate (SPCC-SB) with a thickness of 0.3 mm, brushed with a primer so that the dry film thickness is 35 μm, and dried for 7 days under standard conditions (air temperature 23°C, relative humidity 50%). The test is performed under standard conditions using a type 1 test device, and the coating film is visually inspected for cracks and peeling from the substrate. "Showing bending resistance with a mandrel diameter of a mm" means that when the test is performed using a mandrel with a diameter of a mm or more, no cracks or peeling from the substrate are observed.

[0049] The flex resistance can be set by, for example, the type and epoxy equivalent of the epoxy resin used, the type and active hydrogen equivalent of the amine curing agent, the compounding ratio of the epoxy resin to the amine curing agent, the pigment volume concentration, and the like.

[0050] The non-volatile content of the undercoat material of the present invention is preferably 30 to 90% by weight, more preferably 40 to 80% by weight, and even more preferably 45 to 75% by weight. By having the non-volatile content of the undercoat material within such a range, it becomes easier to apply the undercoat material evenly and uniformly to the base, which is preferable in terms of improving adhesion. In particular, when the base has an uneven pattern, the undercoat material can be applied evenly along the unevenness, and it is possible to form a coating film with excellent finish and adhesion while making use of the uneven pattern. The non-volatile content is a value measured by the method of JIS K5601-1-2, the heating temperature is 105 ° C, and the heating time is 60 minutes.

[0051] In the undercoat material of the present invention, the ratio of the resin solid content (total solid content of epoxy resin and amine curing agent) in the non-volatile content of the undercoat material is preferably 20 to 85% by weight, more preferably 40 to 80% by weight, and even more preferably 60 to 75% by weight. The ratio of the pigment in the non-volatile content of the undercoat material is preferably 15 to 80% by weight, more preferably 20 to 60% by weight, and even more preferably 25 to 40% by weight. By making the ratio of the resin solid content and the pigment in the non-volatile content within the above range, it is possible to enhance the effect of forming a coating film excellent in adhesion, finish coating material suitability, etc. while taking advantage of the shape of the base.

[0052] In the coating of the undercoat material of the present invention, various methods such as brush coating, roller coating, spray coating, etc. can be used. In addition, when coating in a factory, coating can also be performed using a roll coater, flow coater, etc. in addition to the above.

[0053] The amount of the undercoat applied is preferably 0.03 to 0.5 kg / m 2 (More preferably 0.05 to 0.3 kg / m 2 ) The number of coats of the undercoat material may be appropriately set depending on the condition of the base, but is preferably 1 to 2 coats. The undercoat material can be applied and dried in an environment of preferably 0 to 50°C, more preferably 5 to 45°C. The undercoat material of the present invention is preferably a room temperature curing type. The drying time after application of the undercoat material is preferably 1 hour or more, more preferably 2 hours or more and within 14 days.

[0054] [Finishing coating materials] In the present invention, a topcoat material is applied on the coating surface of the undercoat material. By applying the topcoat material, a decorative finish with aesthetic appearance can be obtained. One or more topcoat materials can be used.

[0055] The coating film formed by the above undercoat material can exhibit excellent adhesion to a wide variety of finishing coating materials. The finishing coating material is not particularly limited as long as it is generally used for painting buildings, etc., and the binder thereof can be, for example, organic binder such as acrylic resin, polyurethane resin, epoxy resin, fluororesin, alkyd resin, polyester resin, etc., or inorganic binder such as silicon resin, alkoxysilane, colloidal silica, silicate, etc., organic-inorganic composite binder such as acrylic silicon resin, etc.

[0056] In addition to the binders mentioned above, the components of the finishing coating material include, for example, coloring pigments, extender pigments, thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, preservatives, antifungal agents, anti-algae agents, antibacterial agents, dispersants, defoamers, adsorbents, coupling agents, fibers, crosslinking agents, UV absorbers, light stabilizers, antioxidants, catalysts, solvents, water, etc.

[0057] Specifically, examples of finishing coating materials include weather-resistant topcoat paints for architecture (JIS K5658:2010), weather-resistant paints for steel structures (JIS K5659:2008), glossy synthetic resin emulsion paints (JIS K5660:2008), fire-retardant paints for architecture (JIS K5661:1970), synthetic resin emulsion paints (JIS K5663:2008), road marking paints (JIS K5665:2011), multicolored pattern paints (JIS K5667:2003), synthetic resin emulsion pattern paints (JIS K5668:2010), acrylic resin-based non-aqueous dispersion paints (JIS K5670:2008), lead- and chromium-free rust-preventive paints (JIS K5674:2008), high solar reflectance paints for roofs (JIS K5675:2011), building floor paints (JIS K5970:2008), architectural coating waterproofing materials (JIS A6021:2011), architectural finishing coating materials (JIS A6909:2014), etc.

[0058] The present invention can provide particularly advantageous effects when the finishing coating material is an elastic finishing coating material. Examples of elastic finishing coating materials include those that exhibit flexibility or waterproofing among the architectural finishing coating materials specified in JIS A6909:2014, architectural coating film waterproofing materials specified in JIS A6021:2011, etc. Specifically, examples of elastic finishing coating materials include flexible exterior siliceous-based thin-applied finishing coating materials (flexible exterior thin coating material Si), flexible exterior synthetic resin emulsion-based thin-applied finishing coating materials (flexible exterior thin coating material E), waterproof exterior synthetic resin emulsion-based thin-applied finishing coating materials (waterproof exterior thin coating material E), flexible polymer cement-based multilayer finishing coating materials (flexible multilayer coating material CE), waterproof polymer cement-based multilayer finishing coating materials (waterproof multilayer coating material CE), waterproof synthetic resin emulsion-based multilayer finishing coating materials (waterproof multilayer coating material E), waterproof reactive hardening synthetic resin Examples of such coating materials include oil emulsion-based multi-layer finishing coating materials (waterproof multi-layer coating material RE), waterproof synthetic resin solution-based multi-layer finishing coating materials (waterproof multi-layer coating material RS), flexible synthetic resin emulsion-based renovation finishing coating materials (flexible renovation coating material E), flexible reaction-hardening synthetic resin emulsion-based renovation finishing coating materials (flexible renovation coating material RE), flexible polymer cement-based renovation finishing coating materials (flexible renovation coating material CE), acrylic rubber-based roof coating waterproof materials, urethane rubber-based roof coating waterproof materials, acrylic rubber-based exterior wall coating waterproof materials, and urethane rubber-based exterior wall coating preventative materials.

[0059] The method of applying the finishing coating material is not particularly limited, and a coating method appropriate for each material can be adopted. Examples of coating tools that can be used include sprays, rollers, trowels, and brushes. The amount of the finishing coating material to be applied varies depending on the type of material, but is preferably 0.2 to 5 kg / m. 2 , more preferably 0.3 to 4 kg / m 2 When applied, the coating material can be diluted as necessary. The application and drying of the finishing coating material can be carried out in an environment of preferably 0 to 50°C, more preferably 5 to 45°C. EXAMPLES

[0060] The following examples and comparative examples will clarify the features of the present invention.

[0061] ○ Manufacturing of base agent (Main ingredient 1) Epoxy resin a {dimer acid modified epoxy resin solution, solid content: 60% by weight, epoxy equivalent (per solid content): 780 g / eq, medium: mineral spirits (aniline point 42°C) and solvent naphtha (aniline point 13°C)} 75 parts by weight, titanium oxide (specific gravity: 4.2) 15 parts by weight, talc (specific gravity 2.7) 2 parts by weight, solvent naphtha (same as above) 4 parts by weight, and additives (dispersant, thickener, and defoamer) 4 parts by weight were uniformly mixed in a conventional manner to produce main agent 1.

[0062] (Main ingredient 2) 67 parts by weight of epoxy resin a (same as above), 15 parts by weight of titanium oxide (same as above), 5 parts by weight of heavy calcium carbonate (specific gravity 2.7), 5 parts by weight of talc (same as above), 4 parts by weight of solvent naphtha (same as above), and 4 parts by weight of additives (dispersant, thickener, and defoamer) were uniformly mixed in a conventional manner to produce main agent 2.

[0063] (Main ingredient 3) 61 parts by weight of epoxy resin a (same as above), 15 parts by weight of titanium oxide (same as above), 8 parts by weight of heavy calcium carbonate (same as above), 8 parts by weight of talc (same as above), 4 parts by weight of solvent naphtha (same as above), and 4 parts by weight of additives (dispersant, thickener, and defoamer) were uniformly mixed in a conventional manner to produce main agent 3.

[0064] (Main ingredient 4) Base agent 4 was prepared by uniformly mixing 65 parts by weight of epoxy resin a (same as above), 29 parts by weight of solvent naphtha (same as above), and 6 parts by weight of additives (thickener and defoamer) in a conventional manner.

[0065] (Main ingredient 5) 67 parts by weight of epoxy resin b {phenol novolac type bisphenol A epoxy resin solution, solid content: 60% by weight, epoxy equivalent (per solid content): 600 g / eq, medium: mineral spirits (aniline point 42°C) and solvent naphtha (aniline point 13°C)}, 15 parts by weight of titanium oxide (same as above), 5 parts by weight of heavy calcium carbonate (same as above), 5 parts by weight of talc (same as above), 4 parts by weight of solvent naphtha (same as above), and 4 parts by weight of additives (dispersant, thickener, and defoamer) were uniformly mixed in a conventional manner to produce base agent 5.

[0066] (Main ingredient 6) 38 parts by weight of epoxy resin a (same as above), 15 parts by weight of titanium oxide (same as above), 15 parts by weight of heavy calcium carbonate (same as above), 15 parts by weight of talc (same as above), 12 parts by weight of solvent naphtha (same as above), and 5 parts by weight of additives (dispersant, thickener, and defoamer) were uniformly mixed in a conventional manner to produce base agent 6.

[0067] ○ Manufacturing of hardener (Hardening agent 1) Curing agent 1 was produced by uniformly mixing 15 parts by weight of an amine curing agent a {aliphatic polyamide amine, solid content 100% by weight, active hydrogen equivalent (solid content) 80 g / eq}, 4 parts by weight of a silane compound {N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane}, 16 parts by weight of an alcohol-based solvent, and 65 parts by weight of solvent naphtha (same as above) in a conventional manner.

[0068] (Hardening agent 2) Curing agent 2 was produced by uniformly mixing 15 parts by weight of amine curing agent a (same as above), 16 parts by weight of alcohol-based solvent, and 69 parts by weight of solvent naphtha (same as above) in a conventional manner.

[0069] (Hardening agent 3) 25 parts by weight of amine curing agent b {aliphatic polyamide amine, solid content 100% by weight, active hydrogen equivalent (solid content) 180 g / eq}, 4 parts by weight of silane compound (same as above), 11 parts by weight of alcohol-based solvent, and 60 parts by weight of solvent naphtha (same as above) were uniformly mixed in a conventional manner to produce curing agent 3.

[0070] (Hardening agent 4) Curing agent 4 was produced by uniformly mixing 38 parts by weight of amine curing agent b (same as above), 6 parts by weight of alcohol-based solvent, and 56 parts by weight of solvent naphtha (same as above) in a conventional manner.

[0071] ○Manufacture of undercoating materials (Undercoat material 1) The above-mentioned base agent 1 (100 parts by weight) and the above-mentioned hardener 1 (25 parts by weight) were uniformly mixed to prepare the undercoat material 1. The characteristic values ​​of this undercoat material 1 are as shown in Table 1, and the compounding ratio of the epoxy resin and the amine hardener [(amount of the amine hardener mixed / active hydrogen equivalent of the amine hardener) / (amount of the epoxy resin mixed / epoxy equivalent of the epoxy resin)] (referred to as "mixing ratio" in Table 1) is 0.81, the pigment volume concentration is 8%, the non-volatile content of the undercoat material (referred to as "non-volatile content" in Table 1) is 54% by weight, the ratio of the resin solid content in the non-volatile content of the undercoat material (referred to as "resin ratio" in Table 1) is 72% by weight, the ratio of the pigment in the non-volatile content of the undercoat material (referred to as "pigment ratio" in Table 1) is 25% by weight, and the bending resistance of the mandrel diameter of 2 mm or less is shown in the bending resistance test by the cylindrical mandrel method (referred to as "bending resistance" in Table 1).

[0072] (Undercoat material 2) The base material 2 (100 parts by weight) and the hardener 1 (20 parts by weight) were uniformly mixed to prepare the undercoat material 2. The properties of the undercoat material 2 are shown in Table 1.

[0073] (Undercoat material 3) The base material 3 (100 parts by weight) and the hardener 1 (22 parts by weight) were uniformly mixed to prepare the undercoat material 3. The properties of the undercoat material 3 are shown in Table 1.

[0074] (Undercoat material 4) The base material 2 (100 parts by weight) and the hardener 1 (23 parts by weight) were uniformly mixed to prepare the undercoat material 4. The properties of the undercoat material 4 are shown in Table 1.

[0075] (Undercoat material 5) The above-mentioned base agent 2 (100 parts by weight) and the above-mentioned curing agent 2 (20 parts by weight) were uniformly mixed to prepare the undercoat material 5. The respective property values ​​of this undercoat material 5 are as shown in Table 1.

[0076] (Undercoat material 6) The base material 2 (100 parts by weight) and the hardener 3 (28 parts by weight) were uniformly mixed to prepare the undercoat material 6. The properties of the undercoat material 6 are shown in Table 1.

[0077] (Undercoat material 7) The base material 4 (100 parts by weight) and the hardener 3 (28 parts by weight) were uniformly mixed to prepare the undercoat material 7. The properties of the undercoat material 7 are shown in Table 1.

[0078] (Undercoat material 8) The base material 5 (100 parts by weight) and the hardener 4 (24 parts by weight) were uniformly mixed to prepare the undercoat material 8. The properties of the undercoat material 8 are shown in Table 1.

[0079] (Undercoating material 9) The base material 6 (100 parts by weight) and the hardener 4 (12 parts by weight) were uniformly mixed to prepare the undercoat material 9. The properties of the undercoat material 9 are shown in Table 1.

[0080] (Undercoating material 10) The base material 2 (100 parts by weight) and the hardener 3 (40 parts by weight) were uniformly mixed to prepare the undercoat material 10. The properties of the undercoat material 10 are shown in Table 1.

[0081] The following tests were carried out using the primer obtained by the above method.

[0082] Test 1 A ceramic siding board that had deteriorated due to outdoor exposure was prepared as the existing coating surface (having tile-like convex and concave portions (joints) on the surface, with an irregular uneven pattern on the convex portions, and an inorganic clear coating as the top coating layer). This existing coating surface was placed vertically, and the above-mentioned undercoat material was applied to the entire surface in an amount of 0.1 kg / m. 2After drying for 3 hours, Finishing Coating Material 1 (light brown acrylic silicone resin paint) was applied at a rate of 0.2 kg / m. 2 The test specimens were prepared by spray painting with 100% CO2 and drying and curing for 7 days. The painting and curing processes were all carried out under standard conditions (temperature 23°C, relative humidity 50%).

[0083] The test specimens prepared by the above method were immersed in water for 7 days, after which cross-cuts were made in the coating at each location of the uneven pattern with a utility knife, and tape was applied to the cross-cut areas and peeled off to evaluate adhesion. The evaluation was done on a 4-point scale (A>B>C>D: poor), with "A" being given to those areas where no peeling was observed and "D" being given to those areas where a lot of peeling was observed.

[0084] Test 2 As the existing coating surface, a ceramic siding board that had deteriorated due to outdoor exposure was prepared (having tile-like convex and concave portions (joints) on the surface, with an irregular uneven pattern on the convex portions, and a fluororesin clear coating as the top coating layer). Using this existing coating surface, a test specimen was prepared in the same manner as in Test 1, and the adhesion was evaluated.

[0085] Test 3 As the existing coating surface, a ceramic siding board that had deteriorated due to outdoor exposure (having tile-like convex and concave portions (joints) on the surface, with an irregular uneven pattern on the convex portions, and an acrylic resin coating as the top coating layer) was prepared. Using this existing coating surface, a test specimen was made in the same manner as in Test 1, and the adhesion was evaluated.

[0086] Test 4 A test substrate was prepared by casting a polyurethane sealant on a slate board to a thickness of 5 mm. The above undercoat material was applied to this test substrate at a rate of 0.1 kg / m. 2 Apply with a brush, dry for 3 hours, and then apply Finishing Coating Material 1 (light brown acrylic silicone resin paint) at a rate of 0.2 kg / m. 2Test specimens were prepared by spray painting with 10 ...

[0087] Test 5 A slate board was prepared as the test substrate. The above undercoat material was applied to this test substrate in an amount of 0.1 kg / m 2 After drying for 24 hours, Finish Coating Material 2 (waterproof exterior thin coating material E corresponding to JIS A6909:2014) was applied at a rate of 1kg / m 2 Test specimens were prepared by applying the coating with a trowel and drying and curing for 7 days. The painting and curing processes were all carried out under standard conditions. A peeling test was carried out on the obtained test specimens, in which the edge of the coating on the surface was peeled off with a fingernail. The specimens were rated on a four-level scale (A>B>C>D: poor), with "A" being assigned to specimens that did not peel off at all and "D" being assigned to specimens that peeled off completely.

[0088] Test 6 The same test substrate as in Test 5 was coated with the above primer at a rate of 0.1 kg / m. 2 The coating was sprayed under standard conditions at 100°C and dried for 7 days at 50°C. Next, Finish Coating Material 2 (waterproof exterior thin coating material E corresponding to JIS A6909:2014) was applied at a rate of 1 kg / m 2 The test specimens were then subjected to a peeling test in the same manner as in Test 5.

[0089] (Examples 1 to 6, Comparative Examples 1 to 4) The undercoat materials used and the test results are shown in Table 2. In Examples 1 to 6, generally better results were obtained than in Comparative Examples 1 to 4.

[0090]

Table 1

[0091]

Table 2

Claims

1. A decorative finishing method for applying a primer and a finish coating material to a substrate, comprising: The undercoat material contains an epoxy resin, an amine curing agent, a pigment, and a non-aqueous solvent, The pigment volume concentration is 1 to 30%, The non-aqueous solvent contains a non-aqueous solvent having an aniline point of 12 to 70° C., The pigment is titanium oxide and talc, or titanium oxide, talc and ground calcium carbonate, a compounding ratio of the epoxy resin to the amine curing agent, expressed as [(amount of the amine curing agent / active hydrogen equivalent of the amine curing agent) / (amount of the epoxy resin / epoxy equivalent of the epoxy resin)], is 1.0 or less; In a bending resistance test using a cylindrical mandrel method, the material exhibits bending resistance of 5 mm or less in mandrel diameter. A cosmetic finishing method comprising the steps of:

2. 2. The decorative finishing method according to claim 1, characterized in that the non-volatile content of the undercoat material is 30 to 90% by weight.

3. 2. The decorative finishing method according to claim 1, wherein the epoxy resin contains a dimer acid modified epoxy resin, and the ratio of the dimer acid modified epoxy resin in the epoxy resin is 50% by weight or more.

4. 2. The decorative finishing method of claim 1, wherein the amine curing agent comprises an aliphatic amine curing agent.

5. The decorative finishing method according to any one of claims 1 to 4, characterized in that the finishing coating material is an elastic finishing coating material.

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