Covering material

Abstract

To provide a coating material that is applied to a plasticizer-containing material and forms a coat excelling in plasticizer transfer prevention as well as adhesion.SOLUTION: The present disclosure provides a coating material that is applied to a plasticizer-containing material, the coating material including a polyol component (A) and a polyisocyanate component (B), the polyol component (A) including a polyether polyol (A1) and an acryl polyol (A2).SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] Conventionally, a material containing a plasticizer (hereinafter referred to as "plasticizer-containing material") may be coated on the surfaces of buildings, civil engineering structures, and the like. Further, a coating material may be laminated on the surface of this plasticizer-containing material for protection, design, or the like. However, the plasticizer may migrate into the coating material over time, and the aesthetic appearance may be degraded or the adhesion may be reduced due to the adhesion of contaminants to the surface of the coating material.

[0003] On the other hand, for example, in Patent Document 1, a non-migrating polymer plasticizer has been proposed, and it is described that non-migration can be achieved by increasing the molecular weight.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, generally, low molecular type plasticizers are currently widely used in plasticizer-containing materials, and the development of a coating material applicable to such plasticizer-containing materials is desired.

Means for Solving the Problems

[0006] In order to solve such problems, the present inventors have found that a coating material containing a specific polyol component (A) is excellent in preventing the migration of plasticizers and can form a film excellent in adhesion, and thus completed the present invention.

[0007] In other words, the present invention has the following features. 1. A coating material applied to a plasticizer-containing material, The above coating material comprises a polyol component (A) and a polyisocyanate component (B), The above polyol component (A) includes polyether polyol (A1) and acrylic polyol (A2). The hydroxyl value of the above polyether polyol (A1) is 250 mgKOH / g or more The above polyol component (A) solids Inside, the above polyether polyol (A1) 35% of solids content The above acrylic polyol (A2) is present in an amount of 90% by weight or more. In terms of solid content 10% by weight or more 65 A covering material characterized by containing less than or equal to a certain percentage by weight. 2. The coating material according to 1, characterized in that the polyether polyol (A1) has a molecular weight of 4000 or less. 3. The coating material according to 1, characterized in that the plasticizer-containing material includes a polyurethane resin and a plasticizer. [Effects of the Invention]

[0008] The present invention relates to a coating material applicable to a plasticizer-containing material, comprising a polyol component (A) and a polyisocyanate component (B), wherein the polyol component (A) is a polyether polyol (A1). and acrylic polyol (A2) By including a polyether polyol (A1) with a hydroxyl value of 50 mgKOH / g or more, it is possible to form a coating with excellent resistance to plasticizer migration and excellent adhesion. [Modes for carrying out the invention]

[0009] The present invention will be described in detail below based on its embodiments. The present invention relates to a coating material applicable to a plasticizer-containing material. The plasticizer-containing material is not particularly limited as long as it contains a plasticizer, but materials containing resin and a plasticizer as essential components are preferred. Specific examples of plasticizer-containing materials are not particularly limited and include, for example, coating materials, sheets, sealing materials, plastisols, etc., which may have various functionalities (e.g., waterproofing, flame retardancy, heat resistance, etc.).

[0010] Examples of resins included in the plasticizer-containing material include acrylic resins, vinyl acetate resins, acrylic vinyl acetate resins, ethylene vinyl acetate resins, vinyl propionate resins, polyester resins, alkyd resins, vinyl chloride resins, epoxy resins, urethane resins, acrylic silicone resins, silicone resins, fluororesins, etc., or composites thereof. These can be used individually or in combination of two or more. In the present invention, it is preferable that the plasticizer-containing material contains one or more selected from acrylic resins, vinyl acetate resins, acrylic vinyl acetate resins, ethylene vinyl acetate resins, and urethane resins. In this case, the effects of the present invention are more easily obtained.

[0011] The plasticizer is not particularly limited, but examples include phthalate ester compounds such as dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diheptyl phthalate, dihexyl phthalate, di-2-ethylhexyl phthalate, dioctyl phthalate, diisononyl phthalate, diisodecyl phthalate, diundecyl phthalate, and butylbenzyl phthalate; diethyl adipate, dibutyl adipate, diisobutyl adipate, dihexyl adipate, di-2-ethylhexyl adipate, dioctyl adipate, diisononyl adipate, and diisodecyl adipate. Aliphatic dibasic acid ester compounds such as bis(butyl diglycol) adipate, diethyl sebacate, dibutyl sebacate, dihexyl sebacate, and di-2-ethylhexyl sebacate; adipic acid-based polyester compounds such as 1,3-butylene glycol adipate and 1,2-propylene glycol adipate; maleic acid ester compounds such as dimethyl maleate, diethyl maleate, dibutyl maleate, dihexyl maleate, di-2-ethylhexyl maleate, diisononyl maleate, and diisodecyl maleate;

[0012] Examples include phosphate ester compounds such as triethyl phosphate, tributyl phosphate, tri-2-ethylhexyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, and 2-ethylhexyl diphenyl phosphate; trimet acid ester compounds such as tris-2-ethylhexyl trimellitate; ricinoleic acid ester compounds such as methylacetyl lysinolate; epoxy ester compounds such as di-2-ethylhexyl epoxyhexahydrophthalate, diepoxystearyl epoxyhexahydrophthalate, epoxidized butyl fatty acid, epoxidized 2-ethylhexyl fatty acid, epoxidized soybean oil, and epoxidized linseed oil; benzoic acid ester compounds such as glycol benzoate; chlorinated paraffin; aromatic hydrocarbon compounds such as 1-phenyl-1-xylylethane and 1-phenyl-1-ethylphenylethane; lactones such as γ-butyrolactone; and mixtures of petroleum resins (aromatic hydrocarbon fraction polymers with 8 to 10 carbon atoms) and styrylxylene, etc. These may be present individually or in combination of two or more types.

[0013] In the present invention, it is preferable that the plasticizer-containing material contains one or more selected from phthalate ester compounds, aliphatic dibasic acid ester compounds, phosphate ester compounds, and chlorinated paraffins. In this case, the effects of the present invention can be fully exhibited. Furthermore, in the present invention, the effects of the present invention can be fully exhibited even when a relatively low molecular weight type plasticizer with a molecular weight of 1000 or less (preferably 100 to 800) is included. The molecular weight of the plasticizer is a value calculated from the molecular formula.

[0014] The plasticizer content in the plasticizer-containing material is preferably 5 to 200 parts by weight (more preferably 10 to 150 parts by weight) per 100 parts by weight of resin solids. Thus, even when the plasticizer content is relatively high, the coating material of the present invention can achieve sufficient effects in terms of preventing plasticizer migration and adhesion. In this invention, "α to β" is synonymous with "α or more and β or less".

[0015] The coating material of the present invention is applied to the plasticizer-containing material described above, and can be applied directly to the plasticizer-containing material or via some layer (for example, an undercoat layer, an intermediate coating layer, etc.). It is preferable that the coating material of the present invention be applied directly to the plasticizer-containing material described above. This provides sufficient effect in preventing plasticizer migration and adhesion, making it suitable as a coating material for preventing plasticizer migration. In this invention, "application" means laminating the coating material onto the plasticizer-containing material by any means such as coating or dipping.

[0016] The coating material of the present invention contains a polyol component (A) and a polyisocyanate component (B), and forms a film by the reaction of these. The above polyol component (A) (hereinafter also referred to as “component (A)”) contains a polyether polyol (A1) (hereinafter also referred to as “component (A1)”) as an essential component, and its hydroxyl value is 50 mgKOH / g or more (preferably 100 mgKOH / g or more, more preferably 150 mgKOH / g or more, still more preferably 200 mgKOH / g or more, particularly preferably 250 mgKOH / g or more). Its upper limit is not particularly limited, but it is preferably 1000 mgKOH / g or less (more preferably 800 mgKOH / g or less). By containing such a component (A [1]), excellent plasticizer migration prevention property, adhesion property, etc. can be exhibited. The hydroxyl value mentioned here is a value (mgKOH / g) represented by the number of milligrams of potassium hydroxide equimolar to the hydroxyl groups contained in 1 g of the solid content.

[0017] (A1) component preferably has a molecular weight of 4000 or less (more preferably 2000 or less, still more preferably 1000 or less, particularly preferably 900 or less, most preferably 600 or less), and its lower limit is preferably 50 or more, more preferably 100 or more, still more preferably 150 or more). By using such a component (A1), the plasticizer migration prevention property can be enhanced. In the present invention, the molecular weight of the polyol component is the number average molecular weight (Mn), which is a so-called polystyrene equivalent molecular weight determined by gel permeation chromatography using a polystyrene polymer as a reference.

[0018] (Component (A1)) is obtained by addition polymerization of polyhydric alcohols such as trimethylolpropane, glycerin, hexanetriol, pentaerythritol derivatives, sorbitol, neopentyl glycol, etc. with alkylene oxides such as ethylene oxide and propylene oxide. In the present invention, polymers obtained by addition polymerization of the above polyhydric alcohols with ethylene oxide and / or propylene oxide are preferred, and those with ethylene oxide and / or propylene oxide added to the ends can also be used. Further, in the present invention, as component (A1), it is preferable to contain a polyether polyol having three or more functional groups (hydroxyl groups) with active hydrogen atoms (functional group number of 3 or more). In this case, the crosslink density of the formed film increases, and the prevention of plasticizer migration can be further enhanced.

[0019] In the present invention, the solid content of component (A1) in the solid content of component (A) is preferably 20% by weight or more (more preferably 25% by weight or more, still more preferably 35% by weight or more). The upper limit is not particularly limited, and it may be a form of only polyether polyol (A1), but is preferably 90% by weight or less (more preferably 80% by weight or less). In such a case, it has excellent plasticizer migration prevention properties and is also advantageous in terms of improving adhesion.

[0020] Examples of the polyol component other than the above component (A1) include polyether polyol (excluding the above component (A1)), polyester polyol, castor oil, castor oil-modified polyol, epoxy-modified polyol, silicone-modified polyol, fluorine-modified polyol, acrylic polyol, polycarbonate polyol, polylactone polyol, polybutadiene polyol, polypentadiene polyol, etc. Among them, in the present invention, it is preferable to contain an acrylic polyol.

[0021] Acrylic polyol (A2) (hereinafter also referred to as "component (A2)") contains alkyl (meth)acrylate, hydroxyl group-containing monomer, and other monomers as necessary, and polymers of these can be used. Alkyl (meth)acrylate is a compound having a (meth)acryloyl group and an alkyl group. In this invention, alkyl acrylate and alkyl methacrylate are collectively referred to as alkyl (meth)acrylate. Monomers are a general term for compounds having polymerizable unsaturated double bonds.

[0022] Examples of such alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, n-pentyl (meth)acrylate, isopentyl (meth)acrylate, neopentyl (meth)acrylate, t-pentyl (meth)acrylate, 1-ethylpropyl (meth)acrylate, 2-methylbutyl (meth)acrylate, and (meth) Examples include 3-methylbutyl acrylate, n-hexyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-ethylbutyl (meth)acrylate, 2-methylpentyl (meth)acrylate, 4-methylpentyl (meth)acrylate, n-heptyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-nonyl (meth)acrylate, n-decyl (meth)acrylate, n-undecyl (meth)acrylate, and n-lauryl (meth)acrylate. These can be used individually or in combination of two or more.

[0023] Examples of the hydroxyl group-containing monomers mentioned above include hydroxyalkyl methacrylates such as 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, and 4-hydroxybutyl methacrylate. These can be used individually or in combination of two or more.

[0024] Examples of the above-mentioned other monomers include aromatic monomers, carboxyl group-containing monomers, amino group-containing monomers, pyridine monomers, nitrile group-containing monomers, amide group-containing monomers, epoxy group-containing monomers, carbonyl group-containing monomers, alkoxysilyl group-containing monomers, fluorine-containing monomers, ultraviolet-absorbing group-containing monomers, and photostable group-containing monomers. These can be used individually or in combination of two or more.

[0025] Furthermore, in the present invention, a polyester-containing acrylic polyol, which includes an acrylic polyol and a polyester, can also be used as component (A2). A polyester-containing acrylic polyol can be obtained, for example, by reacting a polyester resin having polymerizable unsaturated groups with an alkyl (meth)acrylate, a hydroxyl group-containing monomer, and, if necessary, other polymerizable monomers.

[0026] Polyester resins having polymerizable unsaturated groups can be obtained by partially using polybasic acids and / or polyhydric alcohols that have polymerizable unsaturated groups when condensing polybasic acids and / or polyhydric alcohols to produce polyester resins. Alternatively, polyester resins having polymerizable unsaturated groups can also be obtained by reacting a polyester resin with a monomer that can react with hydroxyl or carboxyl groups in the polyester resin, specifically maleic acid, (meth)acrylic acid, glycidyl (meth)acrylate, etc.

[0027] The hydroxyl value of component (A2) is preferably 1 to 200 KOH mg / g (more preferably 3 to 100 KOH mg / g, and even more preferably 5 to 80 KOH mg / g). When the hydroxyl value of component (A2) is within this range, it has excellent plasticizer migration prevention properties and is also advantageous in terms of improving adhesion.

[0028] The content (solids) of component (A2) is preferably 10% by weight or more (more preferably 20% by weight or more) relative to the total amount (solids) of component (A). The upper limit is preferably 80% by weight or less (more preferably 75% by weight or less, and even more preferably 65% ​​by weight or less). In this case, it has excellent plasticizer migration prevention properties and is also advantageous in terms of improving adhesion. Component (A) of the present invention is preferably liquid at 20°C and can be used in solvent-soluble, non-aqueous dispersion (NAD), and other forms.

[0029] The polyisocyanate component (B) in the coating material of the present invention (hereinafter also referred to as "component (B)") is a component that undergoes a curing reaction with component (A) described above. In the present invention, such a curing reaction provides sufficient effects in terms of adhesion, plasticizer migration prevention, and the like.

[0030] (B) Examples of component (B) include toluene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (pure-MDI), polymeric MDI, xylylene diisocyanate (XDI), hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), hydrogenated XDI, hydrogenated MDI, etc., or derivatives obtained by allophanation, biuretation, dimerization (uretidioneation), trimerization (isocyanuration), adductation, or carbodiimideation of these; and blocked isocyanates obtained by blocking these with alcohols, phenols, ε-caprolactam, oximes, active methylene compounds, etc., and one or more selected from these can be used.

[0031] In the present invention, it is preferable that component (B) contains hexamethylene diisocyanate (HMDI) and / or its derivatives (hereinafter also referred to as "HMDIs"). The content of the above HMDIs is preferably 90% by weight or more (more preferably 95% by weight or more) based on the total amount (solid content) of component (B). It is also preferable that component (B) consists only of HMDIs. Furthermore, biuret derivatives are preferred. In such cases, the curability of the formed film is excellent, and adhesion, plasticizer migration prevention, etc., can be improved.

[0032] The NCO content of component (B) is preferably 10 to 35% by weight (more preferably 13 to 32% by weight, and even more preferably 15 to 30% by weight). In this case, adhesion can be improved. The NCO content refers to the weight percentage of NCO contained in component (B).

[0033] The mixing of component (A) and component (B) is carried out in a ratio such that the NCO / OH equivalent ratio of component (A) to component (B) is preferably 0.6 to 3.5 (more preferably 0.7 to 2.5, and even more preferably 0.9 to 1.9). In this case, the curing properties are excellent, and the effects of the present invention can be fully demonstrated.

[0034] In the present invention, a curing catalyst that promotes the reaction between component (A) and component (B) can be used in combination. A curing catalyst is a substance that promotes the reaction and curing of isocyanate groups. Examples of curing catalysts include amine catalysts, organometallic catalysts, and inorganic catalysts. For example, amine catalysts include ethylenediamine, triethylenediamine, triethylamine, ethanolamine, diethanolamine, and hexamethylenediamine or their derivatives or mixtures with solvents. Examples of organometallic catalysts include organometallic compounds such as dibutyltin dilaurate and dibutyltin diacetate; and organometallic salts such as potassium acetate, zinc stearate, calcium stearate, lead stearate, aluminum stearate, and tin octoate. Examples of inorganic catalysts include tin chloride. These can be used individually or in combination of two or more, and can also be used in combination with a solvent. In the present invention, it is particularly preferable to include an organometallic catalyst. In this case, curing is accelerated, and sufficient effects in terms of adhesion, plasticizer migration prevention, etc., are exhibited from the initial stage of film formation.

[0035] In addition to the components mentioned above, the coating material of the present invention may also contain various other components, provided that they do not significantly impair the effects of the present invention. Examples of such components include coloring pigments, extender pigments, thickeners, plasticizers, preservatives, fungicides, algaecides, defoamers, leveling agents, pigment dispersants, anti-skinning agents, dryers, matting agents, ultraviolet absorbers, light stabilizers, antioxidants, destaining agents, catalysts, and the like.

[0036] Examples of coloring pigments include titanium dioxide, zinc oxide, carbon black, graphite, black iron oxide, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, copper-manganese-chromium composite oxide, copper-magnesium composite oxide, bismuth-manganese composite oxide, red iron oxide, molybdate orange, permanent red, permanent carmine, anthraquinone red, perylene red, quinacridone red, yellow iron oxide, titanium yellow, first yellow, benzoimidazolone yellow, chromium green, cobalt green, phthalocyanine green, ultramarine, Prussian blue, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, aluminum pigment, and pearl pigment. These can be used individually or in combination of two or more. Examples of extender pigments include heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, white carbon, and diatomaceous earth.

[0037] In the coating material of the present invention, the cohesive force during film formation is enhanced by including powder components such as coloring pigments and extender pigments, resulting in superior effects in terms of adhesion and other properties. To obtain such effects, it is desirable to have a configuration in which the powder component is present in an amount of 1 to 200 parts by weight (preferably 5 to 150 parts by weight) per 100 parts by weight of the total solid content of the polyol component (A) and the polyisocyanate component (B).

[0038] When applying the coating material of the present invention to the plasticizer-containing material (preferably by painting), the main component containing the polyol component (A) and the curing agent containing the polyisocyanate component (B) should be mixed immediately before painting, and then painting should be performed. The solvent can be contained in either the main component, the curing agent, or both. In addition, in the present invention, the solvent can also be mixed in as a diluent at the time of painting, separately from the main component and curing agent. The solvent in the coating material of the present invention is preferably contained in an amount of 5 to 500 parts by weight (preferably 10 to 400 parts by weight, more preferably 20 to 300 parts by weight) per 100 parts by weight of the total solid content of components (A) and (B). If the solvent content is within this range, it is favorable in terms of preventing plasticizer migration, the finish of the topcoat, etc. In particular, it is desirable that the solid content of the coating material of the present invention after dilution be 25 to 90% by weight (more preferably 30 to 85% by weight). Within this range, the above effects can be further enhanced.

[0039] When applying the coating material of the present invention, various methods such as brush painting, roller painting, and spray painting can be used. The amount applied during painting is preferably 30 to 500 g / m². 2 (comfortably 50-300g / m 2 The number of coats of the coating material can be appropriately set depending on the surface condition of the plasticizer-containing material, but preferably it is 1 to 2 times. The coating material of the present invention can exhibit sufficient plasticizer migration prevention even with a single coat.

[0040] In this invention, a topcoat can be applied as needed to protect the film formed by the above-mentioned coating material. Known coating materials can be used as such topcoats. Examples of topcoats include acrylic resin, urethane resin, acrylic silicone resin, fluororesin, epoxy resin, etc. These can be used individually or in combination of two or more, and two or more coating materials can be applied in layers. The topcoat can be applied using known application methods, such as sprayers, rollers, brushes, or other painting tools. [Examples]

[0041] The following examples illustrate the features of the present invention. However, the present invention is not limited to these examples.

[0042] <Materials containing plasticizers> (Material containing plasticizer 1) Plasticizer-containing coating material 1 was prepared by mixing 100 parts by weight (solids) of polyurethane resin with 50 parts by weight of diisononyl phthalate (molecular weight 419) as a plasticizer using a conventional method. (Material containing plasticizer 2) Plasticizer-containing coating material 2 was prepared by mixing 100 parts by weight (solid content) of polyurethane resin with 50 parts by weight of diisononyl adipate (molecular weight 399) as a plasticizer using a conventional method.

[0043] <Coating material> (Main ingredients 1-13) The main component was prepared by mixing component (A), coloring pigment, curing catalyst, and additives according to the formulation shown in Table 1 using a conventional method. The following ingredients were used:

[0044] • Polyol (A) (A1-1) Polyether polyol (Hydroxyl value 55 mg KOH / g, number of functional groups 3, number average molecular weight 3000, solids content 100 wt%) (A1-2) Polyether polyol (Hydroxyl value 160 mg KOH / g, number of functional groups 3, number average molecular weight 1000, solids content 100% by weight) (A1-3) Polyether polyol (Hydroxyl value 230 mg KOH / g, number of functional groups 3, number average molecular weight 700, solids content 100 wt%) (A1-4) Polyether polyol (Hydroxyl value 400 mg KOH / g, number of functional groups 3, number average molecular weight 400, solids content 100 wt%) (A1-5) Polyether polyol (Hydroxyl value 33 mg KOH / g, number of functional groups 3, number average molecular weight 5100, solids content 100 wt%) (A2-1) Acrylic polyol (Hydroxyl value 40 KOH mg / g, Solids content 50 wt%, Medium: Aromatic hydrocarbon compound, Ester compound) (A2-2) Polyester-containing acrylic polyol (Hydroxyl value 40 KOH mg / g, Polyester ratio 10% by weight, Solids content 50% by weight, Medium: Aromatic hydrocarbon compound, Ester compound) Note that all of the above components (A) are liquid at 20°C.

[0045] • Coloring pigment (titanium dioxide, average particle size 0.3 μm) ·Curing catalyst: Organometallic catalyst • Additive 1: Dispersant, defoamer, etc. • Additive 2: Diluting solvent (aromatic hydrocarbon)

[0046] (Hardening agent 1) A curing agent was prepared by mixing 80 parts by weight of polyisocyanate (B) (biuret-type hexamethylene diisocyanate, NCO content 23.5%) with 20 parts by weight of a diluent (aromatic hydrocarbon).

[0047] (Preparation of covering material) The main components 1 to 13 shown in Table 1 and the curing agent were mixed so that the NCO / OH equivalent ratio of the polyol component and the polyisocyanate component was 1.2, thereby obtaining coating materials 1 to 13.

[0048] [Table 1]

[0049] (Examples 1-20, Comparative Examples 1-8) The following evaluations were conducted for each coating material. The results are shown in Table 2. • Preparation of test specimen [I] For a steel plate (150mm x 70mm), apply each plasticizer-containing material (plasticizer-containing coating material) at a rate of 200g / m². 2 It was then brush-painted and cured for 24 hours. Next, each coating material was applied to the surface of the plasticizer-containing material at a rate of 100g / m². 2The material was brush-coated and cured for 24 hours to create test specimen [I]. The combinations of plasticizer-containing material and coating material are shown in Tables 2 and 3. Painting and curing were all carried out under standard conditions (temperature 23°C, relative humidity 50%). <Evaluation of plasticizer migration prevention> The prepared test specimens [I] were left in a 50°C or 80°C constant temperature incubator for one week. The test specimens were removed from the incubator, placed horizontally, and sprinkled with black silica sand. Immediately afterward, the test specimens were placed vertically to allow the black silica sand to fall naturally. At this time, the plasticizer migration prevention performance was evaluated by visually checking the amount of black silica sand that had adhered. The evaluation was conducted on a four-point scale (A>B>C>D), with "A" indicating that almost no black silica sand was attached and "D" indicating that a significant amount of black silica sand was attached.

[0050] <Adhesion Evaluation 1> The adhesion between the surface of the plasticizer-containing material and the coating material was evaluated for the prepared test specimens [I] using the grid tape method in accordance with JIS K 5600-5-6. The evaluation criteria were as follows: A: Defect area is less than 10% B: Defect area is 10% or more but less than 25% C: Defect area is 25% or more but less than 50% D: Defect area is 50% or more

[0051] [Table 2]

[0052] [Table 3]

[0053] In coating materials 1 to 10 (Examples 1 to 20), good plasticizer migration prevention was achieved for plasticizer-containing materials 1 and 2, and a coating with good adhesion was formed. In particular, coating materials 4 to 9 (Examples 4 to 9, 14 to 19) exhibited excellent plasticizer migration prevention. Furthermore, in coating materials 4 to 8 (Examples 4 to 8, 14 to 18), a coating with excellent adhesion was formed for both plasticizer-containing materials 1 and 2.

[0054] Next, the following evaluations were conducted on coating materials 4-8. The results are shown in Tables 2 and 3. • Preparation of test specimen [II] For each of the coating materials 4 to 8, the above test specimen [I] was prepared, and then the topcoat material was applied at a rate of 0.3 kg / m². 2 The material was spray-painted and cured for 72 hours, and this prepared material was designated as test specimen [II]. Painting and curing were all carried out under standard conditions (temperature 23°C, relative humidity 50%). <Top coat material> A main component was prepared by uniformly mixing and stirring 100 parts by weight of acrylic polyol (hydroxyl value 20 KOH mg / g, solids content 50% by weight, medium: aliphatic hydrocarbon compound), 30 parts by weight of titanium dioxide, and 10 parts by weight of additives (thickener, defoamer) using a conventional method. Next, a curing agent was prepared by mixing 50 parts by weight of polyisocyanate (adduct-type hexamethylene diisocyanate, NCO content 12%) and 50 parts by weight of diluent solvent (aliphatic hydrocarbon). The main component and the curing agent were mixed so that the NCO / OH equivalent ratio of the polyol component and the polyisocyanate component was 1.0, and these mixtures were used as the topcoat material.

[0055] <Adhesion Evaluation 2> The adhesion between the prepared test specimens [II] and the covering material and topcoat material was evaluated using the grid tape method in accordance with JIS K 5600-5-6. The evaluation criteria were the same as those for adhesion evaluation 2 described above. As a result, coating materials 6-8 (Examples 6-8, 16-18) were able to form a coating with excellent adhesion.

Claims

1. A coating material applied to a plasticizer-containing material, The above coating material comprises a polyol component (A) and a polyisocyanate component (B). The above polyol component (A) includes a polyether polyol (A1) and an acrylic polyol (A2). The hydroxyl value of the above polyether polyol (A1) is 250 mg KOH / g or more. A coating material characterized in that the polyol component (A) contains, in its solid content, 35% to 90% by weight of the polyether polyol (A1) and 10% to 65% by weight of the acrylic polyol (A2).

2. The coating material according to claim 1, characterized in that the polyether polyol (A1) has a molecular weight of 4000 or less.

3. The coating material according to claim 1, characterized in that the plasticizer-containing material includes a polyurethane resin and a plasticizer.

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