JP2005179535A - Non-solvent type urethan-based composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a urethane-based coating composition giving a coated film excellent in physical properties, high in application efficiency and exerting a small load on environment. <P>SOLUTION: This non-solvent type coating composition is a composition constituted of a polyol component and a polyisocyanate component in which the polyol component is comprised of a polyol having ≤350 molecular weight. The polyol component may have viscosity of ≤500 cP and may be, for example, a 2-6C alkylene glycol, etc. The polyisocyanate component may be a modified polyisocyanate or its derivative (for example, a polymer of diisocyanate, etc.). The coating composition may further contain an epoxy group-containing compound which may have a hydroxy group (for example, an aliphatic diol glycidylether or a hydroxy group-containing aliphatic polyol glycidylether, etc.). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a solventless urethane-based composition that has a low environmental load and excellent physical properties of a coating film.

  Polyurethane resins are widely used as coating compositions or paints for buildings, building components, various vehicles, machinery, plastic products, textile products, etc. because of their high wear resistance, chemical resistance, flexibility, etc. . On the other hand, in recent years, regulations on the release of VOC (volatile organic compounds) into the atmosphere have become stricter in the paint field, and a paint that replaces the solvent-based paint that has been widely used in the past is also desired for urethane paints. Yes. Water-based paints and powder paints have been developed as paints to replace solvent-based paints. However, since the water-based paint contains an emulsifier and a dispersant and the resin is hydrophilized, the water resistance of the coating film is not sufficient, and it takes a long time to dry the coating film. In the case of a powder paint, thick coating is difficult and the adhesion of the coating film is low. Accordingly, solvent-free urethane paints have been developed as non-solvent paints that improve these drawbacks.

  For example, Japanese Patent Application Laid-Open No. 10-292150 (Patent Document 1) describes a polyurethane paint that can be applied without a solvent, and can form a coating film that is excellent in water resistance, salt water shielding property, and followability. 2) a polyhydric alcohol having a dimer diol content of 50 to 100% by weight and a viscosity at 25 ° C. of 2000 cps or less, and (b) an aliphatic or alicyclic isocyanate having a viscosity at 25 ° C. of 200 to 2000 cps. A liquid polyurethane paint is disclosed. In the examples of this document, a mixture having a viscosity of 1200 cps composed of dimer diol and 3-methylpentanediol is used as the (a) polyhydric alcohol. However, this urethane paint has low coatability and low coating film hardness.

Furthermore, JP-A-2000-136226 (Patent Document 2) discloses a diol compound in which an alkylene oxide is added to dimer diol as a paint capable of forming a coating film having excellent coating properties and water resistance even without solvent. %, And a two-component polyurethane paint comprising a low-viscosity polyol mixture having a viscosity at 25 ° C. of 2000 cps or less and a polyisocyanate having a viscosity at 25 ° C. of 2000 cps or less is disclosed. This document describes that the dimer diol is an aliphatic diol having 36 carbon atoms obtained by hydrogenating dimer acid obtained by dimerizing an unsaturated fatty acid having 18 carbon atoms. , Ethylene oxide adducts of dimer diol having a number average molecular weight of about 800 and 1030 are used. However, even in this urethane paint, the efficiency and the hardness of the coating film are low, and transparency and smoothness are deteriorated particularly under high humidity.
JP-A-10-292150 (Claim 1, paragraph numbers [0014] [0015]) JP 2000-136226 A (Claims 1 and 3, paragraph numbers [0006] [0013] [0014])

  Accordingly, an object of the present invention is to provide a urethane-based composition having a low environmental load and high coating film properties such as hardness and wear resistance.

  Another object of the present invention is to provide a solventless urethane-based composition capable of suppressing a decrease in thickness due to foaming or drying, white turbidity even when the thickness of the coating film is large, and forming a coating film having a smooth surface. is there.

  Still another object of the present invention is a solventless urethane-based composition having excellent coating film appearance (designability, high glossiness, color developability, etc.), excellent balance between pot life and drying property, and high workability. Is to provide.

  Another object of the present invention is to provide a solventless urethane-based composition that is excellent in non-staining, fire resistance, water resistance, weather resistance, and chemical resistance.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventor has found that a low molecular weight polyol component and a polyisocyanate (for example, a polyisocyanate having an isocyanurate ring) in a solvent-free urethane composition such as a paint or an adhesive. )), It is found that the load on the environment is small, the physical properties of the coating such as hardness and abrasion resistance are increased, and that addition of an epoxy group-containing compound can suppress the cloudiness and foaming of the coating. Was completed.

That is, the solventless composition of the present invention is a composition composed of a polyol component and a polyisocyanate component, and the polyol component is composed of a polyol having a molecular weight of 350 or less. The polyol component may have a viscosity of 500 cps or less at 25 ° C. The polyol component may be, for example, C _2-6 alkylene glycol. The molecular weight of the polyisocyanate component may be about 150 to 3000, and the molecular weight of the polyisocyanate component may be larger than the molecular weight of the polyol component. The polyisocyanate component may be a polyisocyanate derivative or a modified product (for example, a diisocyanate multimer). The coating composition further includes a compound having an epoxy group, for example, a compound having a viscosity of about 1 to 200 cps at 25 ° C. and having a plurality of glycidyl groups (such as diglycidyl ether of an aliphatic diol). Also good. The compound having an epoxy group may further have a hydroxyl group. The ratio of the isocyanate group of the polyisocyanate component may be about 0.5 to 1.5 mol (particularly 0.7 to 1.3 mol) with respect to 1 mol of the hydroxyl group of the polyol component. The proportion of the compound having an epoxy group may be about 1 to 100 parts by weight (particularly 5 to 80 parts by weight) with respect to 100 parts by weight of the diisocyanate component.

  The present invention also includes a method of forming a coating film by coating the surface of a substrate (such as a substrate having a non-flat surface) with the composition.

  In the present invention, since the low molecular weight polyol component and the polyisocyanate component are combined, the load on the environment is small, and the physical properties of the coating film such as hardness and abrasion resistance can be improved. Further, by thick coating, even if the thickness of the coating film is large, a decrease in thickness due to foaming or drying and clouding can be suppressed, and a coating film having a smooth surface can be formed. In addition, the coating film appearance (designability, high glossiness, color developability, etc.) is excellent, and the workability is improved with a good balance between pot life and drying property. Moreover, since a reaction kettle is unnecessary, it is economically advantageous. Furthermore, it is excellent in non-contamination, fire resistance, water resistance, weather resistance and chemical resistance.

  The solventless composition of the present invention comprises a polyol component and a polyisocyanate component. This composition may further contain a compound having an epoxy group (epoxy group-containing compound). Since the composition of the present invention is a solventless type, VOC generation and flammability are low.

[Polyol component]
In the present invention, the polyol component has a low molecular weight, and the molecular weight of the polyol component is, for example, 350 or less (for example, 50 to 330), preferably 62 to 300 (for example, 62 to 200), and more preferably 76 to 150 ( In particular, it is about 76 to 120).

Examples of the polyol component include aliphatic diols (ethylene glycol, 1,2- or 1,3-propylene glycol, 1,4-, 1,3- or 1,2-butanediol, 2-methyl-1,3. -Propanediol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 2,2,4-trimethylpentane-1 C _1-12 alkanes such as 1,3-diol, 1,8-octanediol, 2-methyl-1,8-octanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-undecanediol Diol), (poly) ether diol (diethylene glycol, triethylene glycol, dipropylene glycol, triplicate) Propylene glycol, di-methylene ether glycol, such as di- or tri-C _2-4 alkylene ether glycols such as di tetramethylene ether glycol), aliphatic polyols (glycerol, trimethylolpropane, trimethylolethane, C _3-12, such as pentaerythritol Aliphatic polyols, etc.), alicyclic diols (cycloalkane diol, cyclohexanedimethanol, cycloalkane diols such as hydrogenated bisphenol A, C _2-4 alkylene oxide adducts of this cycloalkane diol, etc.), aromatic diols (xylylene diene) All, C _2-4 alkylene oxide adducts of bisphenol A, and the like. These polyol components can be used alone or in combination of two or more.

Among these polyol components, aliphatic diols (for example, C _2-6 alkylene glycols such as propylene glycol, butanediol, neopentyl glycol, hexanediol), aliphatic polyols (for example, trimethylolethane, trimethylolpropane, etc.) (Poly) oxy C _2-4 alkylene glycol (dioxy C _2-3 alkylene glycol such as dipropylene glycol), particularly C _2-6 alkylene glycol such as butanediol is preferred.

  The viscosity of the polyol component is 500 cps (mPa · s) or less (for example, 1 to 500 cps), preferably 3 to 300 cps (for example, 3 to 200 cps), more preferably 5 to 100 cps (particularly 10 to 100 cps) at 25 ° C. Degree.

  In the present invention, by using such a polyol component, a coating film having high hardness and wear resistance can be formed, and even if it is thickly coated, a reduction in thickness (thinning) due to foaming or drying of the coating film can be suppressed. . Therefore, generation | occurrence | production of the crack etc. in a coating film can be suppressed and the coating film which has a smooth surface is formed. Moreover, even if the surface of the material to be coated (base material) is a rough surface having fine cracks, unevenness or steps, a smooth and strong coating film can be formed regardless of the surface shape of the base material. For example, even if the base material has joints or the like, a coating film having a smooth surface can be formed by one application. Furthermore, it has excellent appearance characteristics, stain resistance (dirt resistance) and fire resistance on the surface of the coating.

[Polyisocyanate component]
Examples of the polyisocyanate component include aliphatic diisocyanates such as aliphatic diisocyanates such as propylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMDI), and lysine diisocyanate (LDI). 1,6,11-undecane triisocyanate methyloctane, aliphatic triisocyanates such as 1,3,6-hexamethylene triisocyanate], alicyclic polyisocyanates [cyclohexane 1,4-diisocyanate, isophorone diisocyanate (IPDI), Alicyclic diisocyanates such as hydrogenated xylylene diisocyanate and hydrogenated bis (isocyanatophenyl) methane, Alicyclic triisocyanates such as heptane triisocyanate], aromatic polyisocyanates [phenylene diisocyanate, tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), naphthalene diisocyanate (NDI), Bis (isocyanatophenyl) methane (MDI), toluidine diisocyanate (TODI), aromatic diisocyanates such as 1,3-bis (isocyanatophenyl) propane, and the like.

  These polyisocyanate components include derivatives such as multimers (dimers, trimers, tetramers, etc.), adducts, modified products (burette modified products, allophanate modified products, urea modified products, etc.) It may be a urethane oligomer having an isocyanate group.

  In addition, these polyisocyanate components are usually hydrophobic polyisocyanates, but hydrophilic groups [for example, nonionic groups (hydroxyl groups, (poly) oxyethylene groups, alkylphenyl (poly) oxyethylene groups, etc.), Hydrophilic polyisocyanates into which an anionic group (carboxyl group, sulfonic acid group, etc.) or cationic group (tertiary amino group, etc.) is introduced may be used. Hydrophilic polyisocyanates are, for example, from Nippon Polyurethane Industry Co., Ltd., trade names “Aquanate 100 (AQ-100)”, “AQ-110”, “AQ-120”, “AQ-200”, “AQ-”. 210 ".

  Furthermore, these polyisocyanate components may be block type polyisocyanates in which the isocyanate group is protected with a protective group such as lactams (caprolactam, etc.) or oximes (methylethyl ketoxime, acetoxime, etc.).

  These polyisocyanate components can be used alone or in combination of two or more.

  Among these polyisocyanate components, polyisocyanate modified products or derivatives, urethane oligomers having a plurality of isocyanate groups, and the like, particularly polyisocyanate modified products or derivatives such as aliphatic polyisocyanates and alicyclic polyisocyanates are preferred.

  Examples of modified polyisocyanates or derivatives include adducts of polyisocyanates (such as aliphatic polyisocyanates such as hexamethylene diisocyanate) and polyhydric alcohols (such as trimethylolpropane and pentaerythritol), and burettes of the above polyisocyanates. The polymer of polyisocyanate can be preferably used. From the viewpoint of coating properties such as appearance and strength, polyisocyanate (for example, aliphatic polyisocyanate) multimers (for example, polyisocyanate having an isocyanurate ring such as hexamethylene diisocyanate trimer) is particularly preferable. Such polyisocyanate is available, for example, from Mitsui Takeda Chemical Co., Ltd. under the trade name “Takenate D-170N”, and from Nippon Polyurethane Industry Co., Ltd., under the trade names “Coronate R301” and “Coronate R303”. it can.

  The molecular weight of the polyisocyanate component can be selected from the range of about 150 to 3000, preferably about 250 to 2000, more preferably about 300 to 1500 (for example, 300 to 1000, particularly 400 to 700). Furthermore, the molecular weight of the polyisocyanate component is preferably larger than the molecular weight of the polyol component. For example, the molecular weight difference between the two is, for example, 50 to 1000, preferably 100 to 800, and more preferably about 250 to 750. May be.

  The viscosity of the polyisocyanate component (viscosity at 25 ° C.) can be selected from the range of about 100 to 5000 cps, depending on the viscosity of the polyol component and the epoxy group-containing compound described later, for example, 150 to 3000 cps, preferably 200 to 2000 cps, More preferably, it is about 300-1500 cps (especially 300-1000 cps). Furthermore, the viscosity of the polyisocyanate component is preferably larger than the viscosity of the polyol component. For example, the difference in viscosity between the two may be, for example, about 100 to 2000 cps, preferably about 300 to 1000 cps.

  The ratio of the polyol component to the polyisocyanate component is about the equivalent of the isocyanate group of the polyisocyanate component to the hydroxyl group of the polyol component. For example, the ratio of the isocyanate group is about 0.1 to 1 mol of hydroxyl group. It may be about 5 to 1.5 mol, preferably 0.7 to 1.3 mol, more preferably about 0.8 to 1.2 mol. Moreover, the weight ratio of both can be selected from the range of about 100 to 5000 parts by weight of the polyisocyanate component with respect to 100 parts by weight of the polyol component, for example, 200 to 3000 parts by weight of the polyisocyanate component with respect to 100 parts by weight of the polyol component. Part, preferably 300 to 2000 parts by weight, more preferably about 500 to 1500 parts by weight.

[Compound having epoxy group]
The composition of the present invention may contain a compound having an epoxy group (epoxy group-containing compound). When an epoxy group-containing compound is used, when a polyol component having a low freezing point (for example, C _2-6 alkanediol such as butanediol) is used, the polyol component can be prevented from freezing. Moreover, it can suppress that a coating film becomes cloudy or foams under high humidity, and transparency and smoothness fall by using an epoxy-group containing compound.

  The compound having an epoxy group includes a compound having a glycidyl group and an alicyclic epoxy compound, and a compound having a glycidyl group is usually used. Examples of the compound having a glycidyl group include a glycidyl ether compound, a glycidyl ester compound, and a glycidyl amine compound. These epoxy group-containing compounds can be used alone or in combination of two or more.

Examples of the glycidyl ether compound include aliphatic diol glycidyl ether (for example, ethylene glycol glycidyl ether, propylene glycol glycidyl ether, butanediol glycidyl ether, neopentyl glycol glycidyl ether, 1,5-pentanediol glycidyl ether, 1,6- Hexanediol glycidyl ether, 1,7-heptanediol glycidyl ether, 2,2,4-trimethylpentane-1,3-diol glycidyl ether, 1,8-octanediol glycidyl ether, 1,10-decanediol glycidyl ether, etc. C _2-20 alkanediol mono or diglycidyl ether), polyether diol glycidyl ether (diethylene glycol glycidyl ether, collected by Ethylene glycol glycidyl ether, such as di- or tri-C _2-4 alkylene ether glycol mono- or diglycidyl ethers, such as dipropylene glycol glycidyl ether), aliphatic polyol glycidyl ethers (e.g., glycerine triglycidyl ether, trimethylolpropane triglycidyl ether, trimethylol C _3-12 aliphatic polyol mono to tetraglycidyl ether such as ethane glycidyl ether, pentaerythritol glycidyl ether), alicyclic diol glycidyl ether (for example, cyclohexanediol glycidyl ether, cyclohexanedimethanol glycidyl ether), aromatic diol Glycidyl ether (for example, resorcing licidyl ether), heterocyclic polyol glycidyl Ether [for example, (iso) cyanuric acid glycidyl ether etc.] etc. are mentioned. These glycidyl ether compounds can be used alone or in combination of two or more.

The glycidyl ester compounds, for example, aliphatic carboxylic acid glycidyl esters (acetate glycidyl, glycidyl propionate, glycidyl butyrate, glycidyl caprate, C _4-20 aliphatic carboxylic acid glycidyl such as lauric acid glycidyl) aliphatic unsaturation glycidyl carboxylate [(meth) acrylate, glycidyl (meth) acrylic acid methyl glycidyl, aliphatic dicarboxylic acid glycidyl ester (glycidyl succinic acid, glutaric acid glycidyl, glycidyl adipate, C _5-20, such as sebacic acid glycidyl Aliphatic dicarboxylic acid mono- or diglycidyl ester, etc.). These glycidyl ester compounds can be used alone or in combination of two or more.

  Examples of the glycidylamine compound include tetraglycidyldiaminodiphenylmethane, triglycidylaminophenol, diglycidylaniline, diglycidyltoluidine, tetraglycidylxylylenediamine, diglycidyltribromoaniline, tetraglycidylbisaminomethylcyclohexane, and the like. These glycidylamine compounds can be used alone or in combination of two or more.

Among these epoxy group-containing compounds, aliphatic glycidyl ether compounds having a plurality of glycidyl groups, for example, C _2-12 alkanediol diglycidyl such as neopentyl glycol diglycidyl ether and 1,6-hexanediol diglycidyl ether Ether, (poly) oxy C _2-3 alkylene glycol diglycidyl ether is preferred. Furthermore, the epoxy group-containing compound may have a hydroxyl group from the viewpoint of improving the appearance and physical properties of the coating film. Examples of the epoxy group-containing compound having a hydroxyl group (or a compound having a plurality of glycidyl groups and hydroxyl groups) include glycerin diglycidyl ether, trimethylol propane diglycidyl ether, trimethylol ethane diglycidyl ether, pentaerythritol di or tri Aliphatic polyol glycidyl ethers such as glycidyl ether are preferred. Furthermore, you may use combining the epoxy group containing compound which does not have a hydroxyl group, and the epoxy group containing compound which has a hydroxyl group.

  The epoxy equivalent of the epoxy group-containing compound is not particularly limited, but is, for example, about 50 to 1000 g / eq, preferably 70 to 500 g / eq, more preferably 100 to 300 g / eq (particularly 100 to 250 g / eq). .

  The molecular weight of the epoxy group-containing compound can be selected from the range of about 110 to 1000, preferably 120 to 700, and more preferably 150 to 500 (particularly 150 to 300).

  The viscosity of the epoxy group-containing compound is preferably low from the viewpoint of coating workability, for example, 200 cps or less (for example, 1 to 200 cps) at 25 ° C., preferably 1 to 100 cps (for example, 2 to 100 cps). More preferably, it is about 3-50 cps (especially 5-30 cps).

  The proportion of the epoxy group-containing compound is, for example, 1 to 100 parts by weight, preferably 5 to 80 parts by weight, and more preferably about 10 to 50 parts by weight with respect to 100 parts by weight of the total of the polyol component and the polyisocyanate component. is there.

  In the composition of the present invention, a urethanization catalyst may be added to accelerate the urethanization reaction. As the urethanization catalyst, a conventional organometallic catalyst such as a tin-based catalyst such as dibutyltin dilaurate (DBTDL), dibutyltin marker peptide, dioctyltin marker peptide, dibutyltin dimaleate, dibutyltin thiocarboxylate, or the like can be used. . These urethanization catalysts can be used alone or in combination of two or more. The proportion of the urethanization catalyst can be used in the range of 5 parts by weight or less (0 to 5 parts by weight) with respect to 100 parts by weight of the total of the polyol component and the polyisocyanate component, for example, 0.001 to 1 part by weight, Preferably it is 0.005-0.1 weight part, More preferably, it is about 0.005-0.05 weight part. When the ratio of the urethanization catalyst is too large, bubbles are generated or the curing time is shortened.

  The composition of the present invention further contains a conventional pigment component such as an inorganic pigment (white pigment such as titanium oxide, yellow pigment such as titanium yellow, red pigment such as iron oxide red, green pigment such as chrome green, cobalt blue, etc. Blue pigments such as carbon black, black pigments such as carbon black), organic colorants (azo dyes, phthalocyanine dyes, lake dyes, etc.), extenders (calcium carbonate, barium sulfate, aluminum hydroxide, mica, talc, alumina) , Bentonite, magnesium oxide, etc.), luster pigments (metal foils such as stainless steel flakes, metal powders such as aluminum, zinc and copper, glass powders, glass spheres, glass flakes and graphite) may be added. The pigment component may be a rust preventive pigment (for example, an aluminum-containing compound such as aluminum powder, zinc powder, or condensed aluminum phosphate). These pigment components can be used alone or in combination of two or more.

  The proportion of these pigment components can be adjusted according to the application, for example, can be selected from a range of about 1 to 1000 parts by weight with respect to a total of 100 parts by weight of the polyol component and the polyisocyanate component. The amount is about 500 parts by weight, preferably about 5 to 300 parts by weight, and more preferably about 10 to 100 parts by weight.

  The composition of the present invention further contains conventional additives such as fillers, thixotropic agents, viscosity modifiers, dispersants, wetting agents, plasticizers, defoamers, crosslinking agents, curing accelerators, leveling. Agents, lubricants, flame retardants, stabilizers (antioxidants, ultraviolet absorbers, heat stabilizers), antistatic agents and the like may be added. These additives can be used alone or in combination of two or more.

  The method for preparing the composition of the present invention is not particularly limited, and can be prepared by a conventional method of mixing each component. In preparing the composition, each component may be added all at once or in any order. For example, you may add any component of a polyol component and a polyisocyanate component before coating, without adding each component collectively.

  Although the composition of this invention can be used for various uses, such as an adhesive composition and a coating composition, it is suitable for using as a coating composition (coating composition) especially.

  As a method for coating the coating composition (substrate) with a coating composition, conventional methods such as brush, roll coating, spray coating, air spray, airless spray, dipping and the like can be used. The coating thickness (after drying) is not particularly limited and can be selected from the range of about 5 μm to 10 mm depending on the application. For example, the thickness is 10 to 5000 μm, preferably 30 to 3000 μm, more preferably 50 to 1000 μm (particularly 100 to 500 μm). ) In this invention, even if it coats thickly, while being able to suppress generation | occurrence | production of a foam, the reduction | decrease (thinness thinning) of the coating film thickness by drying can be suppressed. Therefore, it is useful for forming a coating film having a large film thickness and high surface smoothness.

  After the composition of the present invention is applied to a substrate, it can be cured at room temperature or heated (for example, heated at about 50 to 100 ° C.) to form a coating film. In addition, in this invention, it can harden | cure rapidly also at normal temperature (for example, about 15-25 degreeC). The coating composition of the present invention can secure a sufficient pot life, has a fast drying or curing time, and has high workability.

  Since the coating composition of the present invention is excellent in adhesion to a substrate and various coating properties, it can be used for coating various substrates. As a base material, the base material comprised by organic materials, such as inorganic materials, such as a metal, ceramics, glass, mortar, concrete, a synthetic resin, and a natural material (wood etc.), can be mentioned, for example. In particular, since it has a high hardness and can form a smooth and strong coating film without being influenced by the surface shape of the base material, a base material having a non-flat surface (for example, a porous base material such as mortar, concrete, wood, etc.) ), And is effective for a substrate having an uneven shape such as a rough surface or a step.

  The composition of the present invention is used in various applications, for example, for surface finishing of buildings and structures, for surface finishing of machinery and equipment, for surfaces and inner surfaces of various pipes such as sewage and gas, home appliances and furniture. It can be used for surface finishing of daily necessities, for the surface and inner surfaces of containers and containers, and for the protective finishing of various vehicle exterior coating films. Among these uses, various buildings and structures (for example, floors, walls, ceilings, sewerage facilities, roads, railways, airport runways, port facilities, underwater facilities or their auxiliary facilities, tunnel inner walls, etc.), especially cement It is useful for buildings and structures having a rough surface, and various products having uneven shapes such as steps.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

  The contents of the components used in the examples and comparative examples, and methods for evaluating the properties of the compositions and coating films are shown below.

(1) Content of each component [Polyol component]
Polyol A: Diethylene glycol, reagent grade 1, purity 99% by weight or more Polyol B: propylene glycol, manufactured by Showa Denko KK, industrial, molecular weight 46.1, specific gravity 1.038, viscosity (25 ° C.) 43 cps
Polyol C: 1,4-butanediol, manufactured by Mitsubishi Chemical Corporation, molecular weight 90.1, specific gravity 1.015, viscosity (25 ° C.) 65-70 cps
Polyol D: 1,6-hexanediol, reagent grade 1, molecular weight 118, melting point 41-42 ° C.

[Polyisocyanate component]
Polyisocyanate A: Trade name “Takenate D-170N”, manufactured by Mitsui Takeda Chemical Co., Ltd., hexamethylene diisocyanate trimer, molecular weight 504, specific gravity 1.16, viscosity (25 ° C.) 2000 cps
Polyisocyanate B: trade name “Coronate R301”, manufactured by Nippon Polyurethane Industry Co., Ltd., viscosity (25 ° C.) 800 cps
Polyisocyanate C: trade name “Coronate R303”, manufactured by Nippon Polyurethane Industry Co., Ltd., viscosity (25 ° C.) 200 cps
Aqueous polyisocyanate D: trade name “Aquanate AQ-200”, manufactured by Nippon Polyurethane Industry Co., Ltd., viscosity (25 ° C.) Y to Z ₂ (Gardner).

[Epoxy group-containing compound]
Glycidyl ether A: Neopentyl glycol diglycidyl ether, trade name “Denacol EX211”, manufactured by Nagase ChemteX Corporation, molecular weight 216, epoxy equivalent 140 g / eq, specific gravity 1.07, viscosity (25 ° C.) 14 cps
Glycidyl ether B: hexamethylene glycol diglycidyl ether, trade name “Denacol EX212”, manufactured by Nagase ChemteX Corporation, molecular weight 230, epoxy equivalent 150 g / eq, specific gravity 1.06, viscosity (25 ° C.) 20 cps
Glycidyl ether C: glycerol polyglycidyl ether, trade name “Denacol EX313”, manufactured by Nagase ChemteX Corporation, epoxy equivalent 141 g / eq, specific gravity 1.22, viscosity (25 ° C.) 150 cps
Glycidyl ether D: Trimethylolpropane polyglycidyl ether, trade name “Denacol EX321”, manufactured by Nagase ChemteX Corporation, epoxy equivalent 140 g / eq, specific gravity 1.15, viscosity (25 ° C.) 130 cps.

[Other additives]
DBTDL: Dibutyltin dilaurate, trade name “L101-V”, manufactured by Tokyo Fine Chemical Co., Ltd., 2 wt% xylene solution and 3 wt% xylene solution Titanium white A: Trade name “JR901”, manufactured by Teika Co., Ltd., Titanium white B : Product name “JR701”, manufactured by Teica Co., Ltd. Stainless steel flake: Product name “RFA4000”, manufactured by Toyo Aluminum Co., Ltd. Zinc powder: Product name “#F”, manufactured by Sakai Chemical Industry Co., Ltd. Aluminum paste: Product name “ 1900M ”, Toyo Aluminum Co., Ltd. Talc: Trade name“ Talc P ”, Fuji Talc Co., Ltd. Mica: Trade name“ WG Mica 325 ”, Shiraishi Kogyo Co., Ltd. Colloidal light calcium carbonate: Trade name“ MC ” -K ”, manufactured by Maruo Calcium Co., Ltd. Dispersant: Trade name“ Antigel ”, manufactured by Schwekmann, thixotropic agent: Trade name“ D "Sparon A603-20X", manufactured by Enomoto Kasei Co., Ltd. Defoaming agent A: trade name "BYK066", manufactured by Schwechman Co., Ltd. Defoaming agent B :, trade name "Mittel S", manufactured by Schwechman.

(2) Evaluation method of each characteristic The obtained coating composition was lightly polished with sandpaper # 240 and washed with toluene (the tin plate described in JIS-K-5410 2- (3), SPTE 1505003 ), And after curing for 7 days indoors, the coated materials were subjected to the following characteristic evaluation tests.

[Workability]
After the coating film was prepared, the coating time was measured and evaluated according to the following criteria.

◎: 5 to 8 hours ○: 3 hours or more and less than 5 hours Δ: 1 hour or more and less than 3 hours ×: less than 1 hour.

[Dryness of coating film]
According to JIS-K-5400 6.5, it evaluated according to the following references | standards.

A: Dried within 8 hours B: Dried over 24 hours within 24 hours Δ: Dried over 24 hours within 48 hours X: Dried after over 48 hours

[Appearance of coating film]
According to JIS-K-5400 7.1, transparency and gloss were evaluated according to the following criteria. About the bubble generation, the film thickness of the part which recognized the 2 or more foaming on the coating surface was measured, and the following references | standards evaluated. In Experimental Examples 2 and 3, the gloss was measured at an incident angle of 60 ° according to JIS-K-5400 7-6.

(transparency)
◎: almost colorless and transparent ○: translucent △: cloudiness (glossy)
◎: Good ○: Semi-gloss △: Less than 3 minutes gloss (degree of foam generation)
A: 200 μm or more ○: 100 μm or more and less than 200 μm Δ: 50 μm or more and less than 100 μm ×: Less than 50 μm

[Film thickness]
Measured using a micrometer.

[hardness]
It measured according to JIS-K-5400 8.4.2.

[Flexibility]
Using a mandrel having a diameter of 6 mm, evaluation was performed according to the following criteria according to JIS-K-5400 8.1.

◎: No abnormality ○: Shallow cracks ×: Peeling.

[Adhesion]
Evaluation was made in 10 stages according to JIS-K-5400 8.5.2. The larger the value, the stronger the adhesion.

[water resistant]
After immersing the coating film in 20 ° C. water for 7 days, the state of the coating film surface was visually observed and evaluated according to the following criteria. In Experimental Examples 2 to 4, evaluation was performed after immersion for 30 days.

A: No change on the coating film surface O: Slight swelling on the coating film surface X: Most of the coating film surface was eluted or peeled off.

[Salt water resistance]
After immersing the coating film in 3% by weight saline for 30 days, the state of the coating film surface was visually observed and evaluated according to the following criteria.

A: No change on the coating film surface O: Slight swelling on the coating film surface X: Rust on most of the coating film surface.

[Acid resistance]
After being immersed in 10% by weight sulfuric acid at room temperature for 10 days, the state of the coating film surface was visually observed and evaluated according to the following criteria.

A: No change on coating film surface O: Slight swelling on coating film surface X: Swelling or rusting on most coating film surface

[Alkali resistance]
After being immersed in saturated lime water at room temperature for 10 days, the state of the coating film surface was visually observed and evaluated according to the following criteria.

A: No change on coating film surface O: Slight swelling on coating film surface X: Swelling occurs on most coating film surface

[Alcohol resistance]
After being immersed in isopropyl alcohol at room temperature for 10 days, the state of the coating film surface was visually observed and evaluated according to the following criteria.

A: No change on coating film surface O: Slight swelling of coating film surface x: Swelling occurs on most of coating film surface.

[Volatile oil resistance]
Based on JIS-K-5400 8.24, after being immersed in the test volatile oil No. 1 for 10 days, the state of the coating film surface was visually observed and evaluated according to the following criteria.

◎: No change on coating surface ○: Swelling slightly on coating surface △: Swelling occurred on most of coating surface ×: Coating completely peeled off

[Boiling water resistance]
After being immersed in boiling water for 5 hours, the state of the coating film surface was visually observed and evaluated according to the following criteria.

A: No change on coating film surface O: Slight swelling on coating film surface X: Most peeling of coating film surface.

[Accelerated exposure test]
After irradiating with a Ducycle-type weatherometer for 500 hours, the state of the coating film was visually observed and evaluated according to the following criteria.

A: Almost no change in the coating film B: The coating film is slightly discolored and the gloss is slightly reduced. X: The coating film is considerably discolored.

[Cleanability]
A commercially available oil-based magic pen black was marked with a circle mark on the surface of the coating film, and after 30 minutes, it was wiped off with Kimwipe S200 (made by Crecia Co., Ltd.) wetted with toluene, and the degree of cleaning was evaluated according to the following criteria.

◎: ○ mark completely disappeared ○: Most of ○ mark disappeared △: Only a small part of ○ mark disappeared ×: ○ mark did not disappear.

[Heat-resistant]
After heating at 150 ° C. for 3 hours, the appearance and adhesion of the coating were tested. The appearance of the coating film was evaluated according to the following criteria, and the adhesion was evaluated by the above method.

A: Almost no change in the coating film B: Slightly fading the coating film B: The coating film is considerably yellowed.

Example 1
In a plastic beaker, 204 parts by weight of glycidyl ether B, 7 parts by weight of DBTDL (2% by weight solution) and 94 parts by weight of polyol A were added, and stirred uniformly using a desktop stirrer to prepare agent A. To this A agent, 702 parts by weight of polyisocyanate A was added as a B agent, and further stirred uniformly to obtain the desired composition. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Example 2
In a plastic beaker, 135 parts by weight of glycidyl ether B, 8 parts by weight of DBTDL (3% by weight solution) and 45 parts by weight of polyol B were added, and stirred uniformly using a desktop stirrer to prepare agent A. To this A agent, 820 parts by weight of water-based polyisocyanate D was added as a B agent, and further stirred uniformly to obtain the desired composition. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Example 3
In a plastic beaker, add 208 parts by weight of glycidyl ether B, 7 parts by weight of DBTDL (2% by weight solution), 17 parts by weight of polyol B and 61 parts by weight of polyol C. Stir evenly using a desktop stirrer, Prepared. To this agent A, 714 parts by weight of polyisocyanate A was added as agent B, and the mixture was further stirred uniformly to obtain the desired composition. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Example 4
A composition was obtained according to Example 3 except that the proportions shown in Table 1 were used. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Examples 5-12
Compositions were obtained according to Examples 1 to 3 except that the components shown in Table 1 were used. About these compositions, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Example 13
In a plastic beaker, 202 parts by weight of glycidyl ether A and 104 parts by weight of polyol D are added, dissolved by heating to about 60 ° C., 7 parts by weight of DBTDL (2% by weight solution) is added, and a table stirrer is used. The agent A was prepared by stirring uniformly. To this A agent, 694 parts by weight of polyisocyanate A was added as a B agent, and further stirred uniformly to obtain the desired composition. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Example 14
In addition to agent A prepared according to Example 4, 6 parts by weight of dispersant, 4 parts by weight of thixotropic agent, 0.5 part by weight of antifoaming agent A, 0.5 part by weight of antifoaming agent B, 408 parts by weight of titanium white A After adding a part and mixing with a glass rod, it kneaded twice using a small 3 rolls, and A agent was obtained. To this agent A, 716 parts by weight of polyisocyanate A was added as agent B, and the mixture was further stirred uniformly to obtain the desired composition. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Example 15
To the agent A prepared according to Example 4, 4 parts by weight of a thixotropic agent, 0.5 parts by weight of an antifoaming agent A, 0.5 parts by weight of an antifoaming agent B, and 130 parts by weight of stainless steel flakes were further added. Using a stirrer, the mixture was uniformly stirred to obtain agent A. To this agent A, 716 parts by weight of polyisocyanate A was added as agent B, and the mixture was further stirred uniformly to obtain the desired composition. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Example 16
In addition to the A agent prepared according to Examples 1 to 3 except that the components shown in Table 1 were used, 15 parts by weight of a thixotropic agent, 0.5 part by weight of antifoaming agent A, 0.5 part by weight of antifoaming agent B Was added and stirred uniformly using a desktop stirrer to obtain agent A. To this agent A, 680 parts by weight of polyisocyanate B as agent B is added and stirred uniformly, and then 3000 parts by weight of zinc powder is further added as agent C and stirred uniformly to obtain the desired composition. It was. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Example 17
In addition to the agent A prepared according to Examples 1 to 3 except that the components shown in Table 1 were used, 4 parts by weight of a dispersant, 5 parts by weight of a thixotropic agent, 0.5 part by weight of an antifoaming agent A, and antifoaming Add 0.5 parts by weight of agent B, 100 parts by weight of titanium white B, 170 parts by weight of talc, 130 parts by weight of mica, mix in advance with a glass rod, and then knead twice using a small three-roll. Obtained. To this A agent, 680 parts by weight of polyisocyanate B as the B agent was added and stirred uniformly. Then, 136 parts by weight of the aluminum paste as the C agent was added and stirred uniformly to obtain the desired composition. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

Example 18
Except for using the components shown in Table 1, A agent prepared according to Examples 1 to 3, 0.5 parts by weight of antifoam A, 0.5 parts by weight of antifoam B, 45 parts by weight of titanium white B, colloid 370 parts by weight of light calcium carbonate was added, mixed in advance with a glass rod, and then kneaded once using a small three roll to obtain agent A. To this A agent, 554 parts by weight of polyisocyanate A as a B agent was added and stirred uniformly to obtain the desired composition. About this composition, while showing the composition in Table 1, the result of having evaluated various characteristics is shown in Table 2.

  As is apparent from the results in Table 2, the compositions of the examples have good coating film properties such as drying property, coating film state, hardness, adhesion, flex resistance, water resistance and cleaning property.

Comparative Example 1
In a plastic beaker, 460 parts by weight of glycidyl ether A and 7 parts by weight of DBTDL (2% by weight solution) are added and stirred uniformly using a table stirrer to prepare agent A. Isocyanate A (540 parts by weight) was added, and the mixture was stirred uniformly again to obtain the desired composition. Table 3 shows the results of evaluating various properties of this composition.

Comparative Examples 2-5
A composition was obtained according to Comparative Example 1 except that the components shown in Table 3 were used. Table 3 shows the results of evaluating various properties of this composition.

Comparative Example 6
To a plastic beaker, add 187 parts by weight of glycidyl ether C, 185 parts by weight of glycidyl ether D, 7 parts by weight of DBTDL (2% by weight solution), and uniformly stir using a table stirrer to prepare agent A, As an agent B, 628 parts by weight of polyisocyanate A was added and stirred uniformly again to obtain the desired composition. Table 3 shows the results of evaluating various properties of this composition.

Comparative Example 7
A composition was obtained according to Comparative Example 6 except that the components shown in Table 3 were used. Table 3 shows the results of evaluating various properties of this composition.

  As is clear from the results in Table 3, the composition of the comparative example has low properties such as drying property, coating state, hardness, and adhesion.

Experimental example 1
After aging the composition obtained in Example 11 for 30 minutes indoors, a bar coater (36 μm) was formed on one side of an A4 size (thickness 1 mm) polycarbonate resin plate (Panlite sheet PC1151, manufactured by Teijin Chemicals Ltd.). ) Was applied once to prepare a test piece 1, and after curing for 7 days indoors, the characteristics were evaluated. The evaluation results are shown in Table 4.

  As is clear from the results in Table 4, the composition of Example 11 has high coating film properties. Therefore, it is suitable for application as a coating agent to polycarbonate plates, acrylic plates (polymethyl methacrylate plates), polystyrene plates, etc., which are considered weak solvent plastics.

Experimental example 2
Using the compositions obtained in Examples 14, 16 and 17, the following test pieces 2 and 3 were prepared and their characteristics were evaluated. The properties of these compositions are shown in Table 5.

  Test piece 2: The composition obtained in Example 16 was once applied to the entire surface of a steel plate (steel sheet described in JIS-K-5410 4.1, SPCC15070008) that had been entirely polished with sandpaper # 240 and washed with toluene. Then, the composition obtained in Example 14 was applied twice by brushing on the entire surface.

  Test piece 3: The composition obtained in Example 17 was applied twice with a brush on the entire surface of the steel plate treated in the same manner as in Test piece 2, and the composition obtained in Example 14 was applied twice with a brush. It was prepared by painting four times in total.

  Each test piece 2 and 3 was used for each characteristic test after curing for 7 days indoors.

  As is apparent from the results in Table 5, the test pieces coated with the compositions obtained in Examples 14, 16 and 17 have performance sufficient to withstand practical use in a general environment.

Experimental example 3
The composition obtained in Example 14 was applied twice with a brush on one side of a flexible asbestos board (JIS-K-5410 2- (6)) whose surface was cleaned with Kimwipe S200 (manufactured by Crecia Co., Ltd.) The test piece 4 was produced and cured for 7 days in the room, and then the characteristics were evaluated. The results are shown in Table 6.

  As is apparent from the results in Table 6, the composition obtained in Example 14 is excellent in various resistances, and thus is suitable for a coating agent for the purpose of cosmetic decoration and protection of cement lumber.

Experimental Example 4
After applying the composition obtained in Example 18 on one side of the flexible asbestos board used in Experimental Example 3 and placing it with a plastic spatula so as to have a thickness of 2 mm, removing the mold, The test piece 5 was produced by inclining and fixing at 60 degrees and drying in a room. After curing for 7 days indoors, the properties of the coating were evaluated. The results are shown in Table 7.

  As is apparent from the results in Table 7, the composition obtained in Example 18 can be used as a thick coating agent and a joint sealant.

Claims (12)

  A solvent-free composition comprising a polyol component and a polyisocyanate component, wherein the polyol component comprises a polyol having a molecular weight of 350 or less.   The composition according to claim 1, wherein the viscosity of the polyol component is 500 cps or less at 25 ° C.   The composition according to claim 1, wherein the molecular weight of the polyisocyanate component is 150 to 3000, and the molecular weight of the polyisocyanate component is larger than the molecular weight of the polyol component.   The composition according to claim 1, wherein the polyisocyanate component is a derivative or modified product of polyisocyanate.   Furthermore, the composition of Claim 1 containing the compound which has an epoxy group.   The composition according to claim 5, wherein the compound having an epoxy group is a compound having a viscosity of 1 to 200 cps at 25 ° C. and having a plurality of glycidyl groups.   The composition according to claim 5, wherein the compound having an epoxy group has a hydroxyl group.   The composition according to claim 1, wherein the ratio of isocyanate groups of the polyisocyanate component is 0.5 to 1.5 mol with respect to 1 mol of hydroxyl groups of the polyol component.   The composition according to claim 5, wherein the proportion of the compound having an epoxy group is 1 to 100 parts by weight with respect to 100 parts by weight of the total of the polyol component and the polyisocyanate component. A composition comprising a diisocyanate multimer (A), a C _2-6 alkylene glycol (B), and a diglycidyl ether (C) of an aliphatic diol, wherein the proportion of isocyanate groups in the multimer (A) is , 0.7 to 1.3 moles per mole of hydroxyl group of alkylene glycol (B), and the proportion of diglycidyl ether (C) is 100 in total of multimer (A) and alkylene glycol (B). The solventless composition which is 5-80 weight part with respect to a weight part.   A method for forming a coating film by coating the surface of a substrate with the composition according to claim 1.   The method of claim 11, wherein the substrate is a substrate having a non-planar surface.