JP2016117795A - Two-liquid type primer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating composition having exudation resistance to a two-liquid type primer composition with respect to a component of a coated object when coated onto an organic substance such as a coating film that is the coated object, even when being a two-liquid type primer composition.SOLUTION: A two-liquid type primer composition is obtained by mixing a main agent containing an epoxy resin and a curing agent containing an amine compound. The main agent contains a silane coupling agent for blending with the main agent. The curing agent contains a silane coupling agent for blending with the curing agent. The silane coupling agent for blending with the main agent is an epoxy-containing silane coupling agent. The silane coupling agent for blending with the curing agent is an amino group-containing silane coupling agent. The epoxy resin is a phenol novolak-modified epoxy resin. The amine is a Mannich-modified amine.SELECTED DRAWING: None

Description

  The present invention relates to a two-component undercoating composition comprising a main component containing an epoxy resin and a curing agent containing an amine compound.

In general, the two-component undercoating composition is used to adhere to an object to be coated such as concrete, wood, a siding board, an extrusion-molded board, or a coating composition or the like coated thereon.
For example, Patent Document 1 and Patent Document 2 describe a two-component undercoat coating composition obtained by mixing a main agent containing an epoxy resin and a curing agent.
Patent Document 3 discloses a two-component undercoat coating composition obtained by mixing a main agent containing an epoxy resin and a curing agent in order to improve adhesion to an object to be coated. A two-component undercoat coating composition containing a silane coupling agent is described.
Furthermore, Patent Document 4 discloses a two-component undercoat paint composition obtained by mixing a main agent containing an epoxy resin and a curing agent in order to improve adhesion to an object to be coated, A two-component undercoating composition containing a silane coupling agent as the main ingredient is described.

JP-A-10-219185 Japanese Patent Laid-Open No. 2001-240646 JP 2013-14668 A JP 2014-37454 A

A two-component undercoat coating composition obtained by mixing an epoxy resin-containing main agent and a curing agent, wherein the main agent or the curing agent contains a silane coupling agent. Adhesion to the paint can be improved. However, if the object to be painted is an architecture or structure, etc., and the object to be coated is organic such as a coating film, such as a paint composition, etc., these are two-component undercoat paints. When the composition is applied, components such as a hydrophilic low-contamination agent contained in the object to be coated may bleed out into the coated two-component undercoating composition.
When the component oozes out into the coated two-component undercoat coating composition, the coating material such as a top coat material applied to the coating film made of the two-component undercoat coating composition consists of the two-component undercoat coating composition. There exists a problem that there exists a possibility that it may become a contact | adherence defect with respect to a coating film.
Accordingly, the object of the present invention is to provide an organic material such as a coating film to be coated even if it is a two-component undercoating composition comprising a main component containing an epoxy resin and a curing agent. An object of the present invention is to provide a coating composition having resistance to bleeding into the two-component undercoat coating composition (hereinafter referred to as bleeding resistance) with respect to the above components.

In order to achieve the above object, the two-component undercoating composition of the invention according to claim 1 is a two-component mixture obtained by mixing a main agent containing an epoxy resin and a curing agent containing an amine compound. The undercoat paint composition is characterized in that the main agent contains a silane coupling agent for compounding the main agent, and the curing agent contains a silane coupling agent for compounding the curing agent.
The two-component undercoat paint composition of the invention described in claim 2 is characterized in that, in the invention according to claim 1, the silane coupling agent for blending the main agent is an epoxy group-containing silane coupling agent.
The two-component undercoat paint composition of the invention according to claim 3 is the invention according to claim 1 or 2, wherein the silane coupling agent for blending the curing agent is an amino group-containing silane coupling agent. Features.
The two-component undercoat paint composition of the invention described in claim 4 is the invention according to any one of claims 1 to 3, wherein the epoxy resin is a phenol novolac-modified epoxy resin. .
The two-component undercoating composition of the invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 3, the amine is a Mannich-modified amine.

According to the present invention, the following effects can be exhibited.
According to the two-component undercoating composition of the invention described in claim 1, when coated on an organic material such as a coating film which is an object to be coated, an effect of excellent bleeding resistance is achieved.
According to the two-component undercoat paint composition of the invention described in claim 2, there is an effect that the stability of the main ingredient containing the epoxy resin is excellent.
According to the two-component undercoat paint composition of the invention described in claim 3, there is an effect that the stability of the curing agent containing the amine compound is excellent.
According to the two-component undercoat paint composition of the invention described in claim 4, there is an effect that the curability of the two-component undercoat paint composition is excellent.
According to the two-component undercoating composition of the invention described in claim 5, when coated on an organic material such as a coating film which is an object to be coated, there is an effect that the bleeding resistance is more excellent.

Hereinafter, embodiments of the present invention will be described in detail.
The present invention is a two-component undercoat paint composition obtained by mixing a main agent containing an epoxy resin and a curing agent containing an amine compound, wherein the main agent contains a silane coupling agent for compounding the main agent. The curing agent contains a silane coupling agent for blending a curing agent.

In this specification, a coating composition refers to a composition that forms a film by coating the surface of an object to be coated, and that has a fluid material that protects the object to be coated. , Mainly containing synthetic resin. In general, in order to impart fluidity to a coating composition, the coating composition contains a solvent. Depending on the type of the solvent, the coating composition can be roughly divided into an aqueous coating composition and an organic solvent coating composition. It can be done. The coating composition can be roughly classified into a two-component type and a one-component type depending on the presence or absence of a curing agent. In the case of the one-component type, the coating composition is composed of a main agent mainly containing a synthetic resin that forms a coating film. On the other hand, when it is a two-component type, the coating composition is composed of the main agent and a hardener containing a substance that is mixed with the main agent and accelerates curing.
In the present specification, the paint mixture refers to a paint immediately before being applied to an object to be coated, and in the case of a one-pack type paint composition, it is a mixture of a paint composition and thinner or water as a diluent, In the case of a two-component coating composition, it refers to a coating composition, a curing agent, and a thinner or thinner as a diluent.
In this specification, painting refers to applying or spraying a paint mixture on the surface of an object to be coated. Tools used for painting include brushes, rollers, plasterers, spray guns or mortar guns.
In the present specification, a coating film refers to a coating film formed by volatilizing a volatile component such as a diluent by a paint mixture applied to an object to be coated.
The non-volatile content refers to a non-volatile component (Non Volatile) remaining after a volatile component such as a diluent is volatilized in the raw material, the main agent, the curing agent, or the paint mixture. In this specification, the non-volatile content may be expressed as NV, and the non-volatile content mass percentage in the raw materials or the like may be expressed as, for example, 20% non-volatile content as NV 20%.
Epoxy equivalent means the mass (g / eq) of a resin (main agent) containing 1 equivalent of an epoxy group. The active hydrogen equivalent is the same as this.

(Main agent containing epoxy resin)
The main agent of the present invention contains an epoxy resin. The epoxy resin is a hydrocarbon group containing an ether bond to oxygen directly bonded to an aromatic hydrocarbon group or an aliphatic hydrocarbon group constituting the epoxy-containing substance (the ether in the term “hydrocarbon group containing an ether bond”). The oxygen atom constituting the bond does not include oxygen bonded directly to the aromatic ring of the aromatic hydrocarbon group. Note that in the compound, the hydrocarbon group including an ether bond may have one ether bond or a plurality of ether bonds.

The epoxy resin is not particularly limited as long as it does not impair the effects of the present invention. Examples thereof include bisphenol-modified epoxy resins, glycidyl ester-modified epoxy resins, glycidylamine-modified epoxy resins, novolac-modified epoxy resins, dimer acid-modified epoxy resins, aliphatic-modified epoxy resins, and aromatic-modified epoxy resins.
Among these, in terms of excellent adhesion to the object to be coated, novolaks such as bisphenol-modified epoxy resins such as bisphenol A type epoxy resin and bisphenol F type epoxy resin, phenol novolac type epoxy resins and cresol novolac type epoxy resins A modified epoxy resin is preferred.
Furthermore, a phenol novolac type epoxy resin is preferable in terms of improving curability and being able to quickly obtain a coating film having practical strength.

  As cresol novolac type epoxy resin, Epicron N-660, Epicron N-665, Epicron N-670, Epicron N-673, Epicron N-680, Epicron N-690, Epicron N-695, Epicron N- manufactured by DIC Corporation 665-EXP, Epicron N-672-EXP, Epicron N-655-EXP-S, Epicron N-662-EXP-S, Epicron N-665-EXP-S, Epicron N-670-EXP-S, Epicron N- 685-EXP-S, Epicron N-673-80M, Epicron N-680-75M, Epicron N-690-75M and the like can be used.

  As a phenol novolac type epoxy resin, DIC Corporation Epicron N-730A, Epicron N-740, Epicron N-770, Epicron N-775, Epicron N-740-80M, Epicron N-770-70M, Epicron N-865 , Epicron N-865-80M, jER-152, jER-154 manufactured by Mitsubishi Chemical Corporation, and the like can be used.

In the present invention, the main agent containing an epoxy resin contains a silane coupling agent for compounding the main agent.
A silane coupling agent is a hydrolyzable silicon in which functional groups having reactivity with organic substances such as vinyl polymerizable groups, epoxy groups, amino groups, (meth) acrylic groups, mercapto groups, and isocyanate groups are present in the molecule. A compound. In addition, a (meth) acryl group is a general term for a methacryl group and an acrylic group.
The main agent containing an epoxy resin has a functional group having reactivity with an organic substance and a silicon compound having reactivity with an inorganic substance by containing a silane coupling agent for compounding the main agent, and the coating mixture is organic, inorganic Regardless of, the adhesion to the object to be coated is excellent.

As the vinyl polymerizable group-containing silane coupling agent, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, vinylmethyldimethoxysilane and the like can be used.
As epoxy group-containing silane coupling agents, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyl Methyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, or the like can be used.
As amino group-containing silane coupling agents, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane , 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, phenylaminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, etc. are used. be able to.
As a (meth) acryl group-containing silane coupling agent, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3 -Acryloxypropyltrimethoxysilane and the like can be used.
As the mercapto group-containing silane coupling agent, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane and the like can be used.
As the isocyanate group-containing silane coupling agent, 3-isocyanatepropyltriethoxysilane, 3-isocyanatepropyltrimethoxysilane, or the like can be used.

  The silane coupling agent for blending the main agent is not particularly limited as long as it does not impair the effects of the present invention, but the epoxy group-containing silane coupling is excellent because of the excellent stability of the main agent containing an epoxy resin. An agent is preferable, and 3-glycidoxypropylmethyldiethoxysilane and 3-glycidoxypropyltriethoxysilane are more preferable.

  The content of the silane coupling agent in the main component containing the epoxy resin is preferably 0.25 to 12.0 parts by mass with respect to 100 parts by mass of the epoxy resin non-volatile content. If it is less than 0.25, the amount of the functional group and silicon compound in the main agent is decreased, and the effect of improving the adhesion to the object to be coated may be insufficient. On the other hand, when the amount exceeds 12.0 parts by mass, the viscosity of the main agent increases and the coating stability may be deteriorated. More preferably, it is 0.5-8.0 mass parts, Most preferably, it is 1.0-5.0 mass parts.

  The main agent containing an epoxy resin may contain a diluent, an antifoaming agent, a preservative, and the like, if necessary.

The diluent is a liquid that is passed through to reduce the viscosity of the main agent and the resin content in order to adjust the workability during coating, and is also referred to as a thinner. As the diluent, an organic solvent or water is used. In the present invention, an organic solvent is used.
As an organic solvent used for the diluent, aromatic hydrocarbons such as benzene and toluene, mineral spirits defined in industrial gasoline (JIS K 2201-1991) No. 4, and the like can be used.

(Curing agent containing amine compound)
The curing agent of the present invention is a curing agent containing an amine compound. As the amine compound, aliphatic, alicyclic, aromatic, heterocyclic, and Mannich amine compounds that are a combination of these amines and carbonyl compounds can be used.

  Examples of the aliphatic amine compound include alkylene polyamines, polyalkylene polyamines, and other aliphatic polyamines. More specifically, for example, diamine, ethylenediamine, 1,2-diaminopropane, 1,3 -Diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, diaminodecane, diethylenetriamine, Dipropylenetriamine, triethylenetetramine, tripropylenetetramine, tetraethylenepentamine, tetrapropylenepentamine, pentaethylenehexamine, nonaethylenedecane, trimethylhexamethylenediamine, tetra (aminomethyl) methane, teto Kis (2-aminoethylaminomethyl) methane, 1,3-bis (2'-aminoethylamino) propane, triethylene-bis (trimethylene) hexamine, bis (3-aminoethyl) amine, bishexamethylenetriamine and these And the like.

  Examples of the alicyclic amine compound include 1,4-cyclohexanediamine, 4,4′-methylenebiscyclohexylamine, 4,4′-isopropylidenebiscyclohexylamine, norbornadiamine, bis (aminomethyl) cyclohexane, and diamino. Examples include dicyclohexylmethane, isophoronediamine, mensendiamine, and compounds thereof.

  As aromatic amine compounds, bis (aminoalkyl) benzene, bis (aminoalkyl) naphthalene, aromatic polyamine compounds having two or more primary amino groups bonded to the benzene ring, other aromatic polyamines, These compounds etc. are mentioned. More specifically, for example, bis (cyanoethyl) diethylenetriamine, o-xylenediamine, m-xylenediamine (MXDA), p-xylenediamine, phenylenediamine, naphthylenediamine, diaminodiphenylmethane, diaminodiethylphenylmethane, 2,2 -Bis (4-aminophenyl) propane, 4,4'-diaminodiphenyl ether, 4,4'-diaminobenzophenone, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl sulfone, 2,2'-dimethyl- 4,4′-diaminodiphenylmethane, 2,4′-diaminobiphenyl, 2,3′-dimethyl-4,4′-diaminobiphenyl, 3,3′-dimethoxy-4,4′-diaminobiphenyl, bis (aminomethyl ) Naphthalene, bis (aminoethyl) naphtha N'ya such these compounds.

  Examples of the heterocyclic amine compounds include N-methylpiperazine, morpholine, 1,4-bis- (8-aminopropyl) -piperazine, piperazine-1,4-diazacycloheptane, 1- (2′-amino). Ethylpiperazine), 1- [2 ′-(2 ″ -aminoethylamino) ethyl] piperazine, diazacycloeicosane, diazacyclooctacosane, and compounds thereof.

  Examples of Mannich-based amine compounds include those obtained by reacting phenols, formaldehyde, m-xylenediamine (MXDA), and the like. Specifically, for example, Ancamine 2432 and Ancamine 2089M manufactured by Air Products, Versamine F20, Versamine I-368, Versamine M-1 manufactured by Cognis Japan, Epicure 3549 manufactured by Shell, Epicure 3378, manufactured by Witco Adeka Hardener EH342M, Adeka Hardner EH3427A, Adeka Hardner EH350, Adeka Hardner EH351, Sanwa Chemical W-3000, Sunmide W-1000, Sunmide W-500, Sunmide CX-102 , Daito Sangyo Co., Ltd., Daitokural SK-900FB, Daitokuraru X-985, Daitokuraru X-9422, Daitokuraru X-9581, DIC Corporation Rakkamide V6 221, and the like Rakkamaido WN-170.

  The amine compound is not particularly limited as long as it does not impair the effects of the present invention, but a Mannich-based amine compound that is excellent in bleeding resistance by forming a high-density bridge is preferable.

In this invention, the hardening | curing agent containing an amine compound contains the silane coupling agent for hardening | curing agent compounding.
The curing agent containing an amine compound has a functional group having reactivity with an organic substance and a silicon compound having reactivity with an inorganic substance by containing a silane coupling agent for compounding a curing agent, and the coating mixture is organic. Regardless of inorganic, it has excellent adhesion to the object to be coated.
In addition, the main agent containing the epoxy resin contains a silane coupling agent for compounding the main agent, and the curing agent containing the amine compound contains the silane coupling agent for compounding the curing agent, thereby the main agent and the curing agent. The two-component undercoating composition obtained by mixing the above and the like has a bleeding resistance against components of the organic material to be coated when applied to an organic material such as a coating film that is the material to be coated.

  The silane coupling agent for compounding the curing agent is not particularly limited as long as it does not impair the effects of the present invention. However, since the stability of the curing agent containing an amine compound is excellent, an amino group-containing silane A coupling agent is preferable, and phenylaminopropyltrimethoxysilane and N-phenyl-3-aminopropyltrimethoxysilane are more preferable.

  The content of the silane coupling agent in the curing agent containing the amine compound is preferably 0.1 to 8.0 parts by mass with respect to 100 parts by mass of the amine compound non-volatile content. If it is less than 0.1, the amount of the functional group and the silicon compound in the curing agent decreases, and the effect of improving the adhesion to the object to be coated may be insufficient. On the other hand, if it exceeds 8.0 parts by mass, the viscosity of the curing agent may increase and the coating stability may be deteriorated. More preferably, it is 0.2-6.0 mass parts, Most preferably, it is 0.4-3.0 mass parts.

  The curing agent containing an amine compound may contain a curing accelerator, a diluent, an antifoaming agent, a preservative, and the like as necessary.

The curing accelerator may be a conventionally known curing accelerator used in coatings, but tertiary amines and acrylates are preferable from the viewpoint of excellent curing speed and low temperature (5 ° C. or less) curability. preferable.
The tertiary amine is not particularly limited, and examples thereof include triethanolamine, dialkylaminoethanol, triethylenediamine [1,4-diazacyclo (2,2,2) octane], 2,4,6-tri (dimethylamino). Methyl) phenol and the like. Among these, 2,4,6-tri (dimethylaminomethyl) phenol is preferable because of its excellent curability.
Although it does not restrict | limit especially as said acrylate ester, A polyfunctional acrylate ester is preferable, for example, M-Cure400 by a Sartomer company etc. is mentioned.

(How to make main agent and curing agent)
The main agent containing the epoxy resin and the curing agent containing the amine compound can be obtained by stirring and mixing the components to be blended in each. The two-component undercoating composition of the present invention is obtained by stirring and mixing the main component containing the epoxy resin obtained separately and the curing agent containing the amine compound immediately before coating. Can do.
In the stirring / mixing, a conventionally known mixing / stirring device such as a paint shaker, a high speed disper, a sand grind mill, a basket mill, a ball mill, a three-roll mill, a loss mixer, a planetary mixer may be used.

Next, the operation of the two-component undercoat paint composition configured as described above will be described.
The main agent containing the epoxy resin contains a silane coupling agent for compounding the main agent, and the curing agent containing the amine compound contains the silane coupling agent for compounding the curing agent, whereby the main agent and the curing agent are combined. The two-component undercoat paint composition formed by mixing has excellent bleeding resistance when the article to be coated is applied to an organic material such as a coating film.

  The embodiment will be described more specifically with reference to experimental examples below, but the present invention is not limited thereto. In addition, Experimental Examples 1-13, 15-20, and 22-27 are Examples, and Experimental Examples 14 and 21 are Comparative Examples.

(Preparation of main agent and curing agent, etc.)
The main agent containing an epoxy resin was prepared as main agents 1 to 16 in the blending amounts shown in Tables 1 to 3. Moreover, the hardening | curing agent containing an amine compound was created as the hardening | curing agents 1-16 by the compounding quantity of Table 4 to Table 6. A high speed disper was used for each stirring and mixing. Various paint mixtures were prepared and evaluated by combining the main agents 1 to 16 and the curing agents 1 to 16, and were used as experimental examples.

  The following epoxy resins were used, and symbols were used in the table. The epoxy resin symbol: raw material name (manufacturer) type is described below. EP-A: Epicron 5920-70M (DIC Corporation) phenol novolac type epoxy resin (non-volatile content: 70%, epoxy equivalent 644 g / eq (non-volatile content conversion)), EP-B: Haripor EP-450 (Harima Chemicals Co., Ltd. ) Phenol novolac type epoxy resin (nonvolatile content: 60%, epoxy equivalent 1198 g / eq (nonvolatile content conversion)), EP-C: Epicron N-680-75M (DIC Corporation) Cresol novolak type epoxy resin (nonvolatile content: 75) %, Epoxy equivalent 220 g / eq (nonvolatile content conversion)), EP-D: Epicron 840-S (DIC Corporation) bisphenol A type epoxy resin (nonvolatile content: 100%, epoxy equivalent 185 g / eq (nonvolatile content conversion)) .

  The following silane coupling agents for blending the main agent were used, and symbols were used in the table. The symbol: composition of the silane coupling agent is described below. SC-F: 3-glycidoxypropyltriethoxysilane (nonvolatile content: 98%), SC-G: 3-glycidoxypropylmethyldiethoxysilane (nonvolatile content: 98%), SC-H: 3-methacrylic Roxypropyltriethoxysilane (nonvolatile content: 98%), SC-I: N-phenyl-3-aminopropyltrimethoxysilane (nonvolatile content: 98%).

  The following amine compounds were used, and symbols were used in the table. The symbol of amine compound: Raw material name (manufacturer) type or composition is described below. NH-K: Rakkamide WN-170 (DIC Corporation) Mannich amine compound (nonvolatile content: 100%, active hydrogen equivalent 93 g / eq (nonvolatile content conversion)), NH-L: Adeka Hardener EH-3427A (ADEKA Corporation) ) Mannich-based amine compound (nonvolatile content: 100%, active hydrogen equivalent 155 g / eq (nonvolatile content conversion)), NH-M: m-xylenediamine (nonvolatile content: 100%, active hydrogen equivalent 34.1 g / eq (nonvolatile) Minute conversion)), NH-N: diethylenetriamine (nonvolatile content: 100%, active hydrogen equivalent 20.7 g / eq (nonvolatile content conversion)).

  The following silane coupling agents for blending the curing agent were used, and symbols were used in the table. The symbol: composition of the silane coupling agent is described below. SC-P: N-phenyl-3-aminopropyltrimethoxysilane (nonvolatile content: 98%), SC-Q: aminopropyltrimethoxysilane (nonvolatile content: 98%), SC-R: 3-methacryloxypropyltri Ethoxysilane (nonvolatile content: 98%), SC-S: 3-glycidoxypropyltriethoxysilane (nonvolatile content: 98%).

  As the curing accelerator, curing accelerator A: 2,4,6-tri (dimethylaminomethyl) phenol (nonvolatile content: 100%) was used.

(Painting method, etc.)
The main component containing an epoxy resin and the curing agent containing an amine compound are blended in a mass with a ratio of approximately the same number of reactive groups from the epoxy equivalent and the active hydrogen equivalent. A mixture was obtained. The paint mixture was applied to a test specimen or an object to be coated by spraying or the like and dried to obtain a coated object as a coating film. Regarding the performance of the main agent containing an epoxy resin and the curing agent containing an amine compound, and the coating mixture and coating film obtained therefrom, the stability of the main agent and the stability of the curing agent, adhesion, bleeding resistance and curability are as follows. Measured according to the method.

(Evaluation)
Main agent stability and curing agent stability: JIS K 5600-2-7 (1999), 7. Evaluated by heating stability. The main agent or curing agent as a sample was put in a container, sealed, stored at a temperature of 35 ° C. for 3 months, returned to room temperature, and the state in the container was confirmed. And, when the measured viscosity value is within ± 20% compared to before the start of the test and there is no resin sedimentation, the viscosity measured value exceeds ± 20% compared to before the start of the test, but the resin sedimented. The case where there was no resin was evaluated as ◯, the case where the resin settled and it became uniform by stirring was evaluated as Δ, and the case where the resin was precipitated and did not become uniform even when stirred was evaluated as x.

  Adhesion: The coating mixture of the present invention is dried on a fiber-reinforced cement board coated with a fine-coated urethane (Kikusui Chemical Co., Ltd.) polyurethane resin paint with a dry film thickness of approximately 80 μm, assuming renovation of buildings and structures. A test specimen was prepared by coating with a film thickness of approximately 40 μm. And it evaluated using JISK5600-5-6 (1999) coating-material general test method-Part 5: Mechanical property of a coating film-Section 6: Adhesiveness (cross-cut method). The test results were evaluated according to the classification of JIS K 5600-5-6 (1999) adhesion (cross cut method), with classification 0 as ◎, classification 1 as ◯, and classifications 2 to 5 as x.

  Bleeding resistance: Applying the paint mixture of the present invention to a fiber-reinforced cement board coated with water-based fine-coated silicon (Kikusui Chemical Co., Ltd.) water-based acrylic silicone resin paint, assuming renovation of buildings and structures, After confirming the exuding property of the base component, View Top Silicon (Kikusui Chemical Co., Ltd.) water-based acrylic silicon resin paint was applied as a top coating material to prepare a test specimen. And it evaluated using JISK5600-5-6 (1999) coating-material general test method-Part 5: Mechanical property of a coating film-Section 6: Adhesiveness (cross-cut method). The test results are as follows: no bleed out of the base component and no classification of the base component in the classification of JIS K 5600-5-6 (1999) adhesion (cross-cut method). There was an exudation of the base component, classification 0 or 1 was evaluated as ◯, exudation of the base component was classified, Δ was classified as 2 or 3, and exudation of the base component was evaluated, and classification 4 or 5 was evaluated as x.

  Curability: JIS K 5600-5-4 (1999) Paint General Test Method-Part 5: Mechanical Properties of Paint-Section 4: Hardness according to scratch hardness (pencil method) was evaluated. The specimen was tested on a fiber reinforced cement board coated with a fine-coated urethane (Kikusui Chemical Co., Ltd.) polyurethane resin paint with a dry film thickness of about 80 μm and the paint mixture of the present invention with a dry film thickness of about 40 μm. The body. The scratch hardness was evaluated as ◎ when harder than H, ◯ when harder than HB, △ when harder than 2B, and × when softer than 2B.

(Experimental Examples 1-7)
In Experimental Examples 1 to 7, as shown in Table 7, the coating mixture was obtained by using the curing agent 1 for the main agents 1 to 7. In Experimental Example 4 using bisphenol A type epoxy resin as the main agent, the curability was slightly inferior. In addition, Experimental Example 7 using N-phenyl-3-aminopropyltrimethoxysilane as the main silane coupling agent resulted in slightly inferior main agent stability.
Experimental example 1 is the best experimental example.

(Experimental Examples 8 to 13)
In Experimental Examples 8 to 13, as shown in Table 8, the coating mixture was obtained by using curing agents 2 to 7 for the main agent 1. In Experimental Example 10 using diethylenetriamine as the curing agent, the bleeding resistance was slightly inferior. Moreover, Experimental Example 13 using 3-glycidoxypropyltriethoxysilane as the silane coupling agent of the curing agent resulted in slightly inferior curing agent stability.

(Experimental Examples 14 to 20)
In Experimental Examples 14 to 20, as shown in Table 9, the coating mixture was obtained by using the curing agent 1 for the main agents 10 to 16. In Experimental Example 14 in which the main component did not contain a silane coupling agent, the bleeding resistance was inferior. In addition, Experimental Example 20 containing a large amount of a silane coupling agent in the main agent resulted in slightly inferior main agent stability.

(Experimental Examples 21-27)
In Experimental Examples 21 to 27, as shown in Table 10, the coating mixture was obtained by using curing agents 10 to 16 for the main agent 1. In Experimental Example 21 in which the curing agent did not contain a silane coupling agent, the bleeding resistance was inferior. Further, Experimental Example 27 in which the curing agent contained a large amount of the silane coupling agent resulted in slightly inferior curing agent stability.

Claims (5)

A two-component undercoat coating composition obtained by mixing a main agent containing an epoxy resin and a curing agent containing an amine compound,
A two-component undercoat paint composition, wherein the main agent contains a silane coupling agent for compounding the main agent, and the curing agent contains a silane coupling agent for compounding the curing agent.   The two-component undercoat paint composition according to claim 1, wherein the silane coupling agent for blending the main agent is an epoxy group-containing silane coupling agent.   The two-component undercoat paint composition according to claim 1 or 2, wherein the silane coupling agent for compounding a curing agent is an amino group-containing silane coupling agent.   The two-component undercoat paint composition according to any one of claims 1 to 3, wherein the epoxy resin is a phenol novolac-modified epoxy resin.   The two-component undercoat paint composition according to any one of claims 1 to 4, wherein the amine is a Mannich-modified amine.