JP2003286448A - Aqueous composition for undercoating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aqueous composition for an undercoating material that is capable of applying in any time throughout a whole year from a winter season (-10°C) to a summer season (40°C) and that exhibits high adhesion with a broad range of underlying substrates. <P>SOLUTION: The aqueous composition for the undercoating material is characterized by being constituted of a component (A): 5-40 wt.% of a synthetic resin binder, a component (B): 5-40 wt.% of an inorganic binder and 50-200 pts. wt. based on 100 pts. wt. of the component (A), a component (C): 0.5-3 wt.% of a polyhydric alcohol and a component (D): 0.5-8 wt.% of a low molecular weight alcohol. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a water-based undercoating material used for interior / exterior coating of buildings and can be applied in any season from winter to summer and has high adhesion to a wide range of substrates. The present invention relates to a water-based undercoat material composition.

[0002]

2. Description of the Related Art At present, from the viewpoints of global environmental problems, safety and health problems, fire hazards, etc. The conversion to water-based coating materials is being promoted. However, in the case of painting in Japan during the winter, it is common that the outdoor daytime temperature is 5 ° C or less, and depending on the location, it is 0 ° C or less, so the water-based coating material is frozen. Because of problems and problems of poor drying and curing, it was difficult to carry out coating work especially in cold regions.

[0003]

Therefore, since the coating work in winter has the above-mentioned problems, it is unavoidable to use the solvent-based coating material in the cold district, and moreover, Even when such a solvent-based coating material is used, there is a concern that various construction work and dry curability may be affected. Specifically, for example, in the case of a dry-curable coating material, the viscosity changes greatly with temperature and the volatility of the solvent changes significantly with temperature. In some cases, workability and finishability may be deteriorated due to problems in workability and finishability, or because drying is significantly delayed in winter.

Therefore, it is common to adjust the evaporation rate by adjusting the evaporation rate by combining various solvents used as a diluent for the paint. However, when the boiling point of the solvent is raised to decrease the evaporation rate, , Although the drying of the paint in the winter is delayed, on the contrary, when the boiling point of the solvent is lowered and the evaporation rate of the solvent is increased, the drying of the paint in the summer is so fast that the finish of the coating is poor and the quality is deteriorated. There was a risk of this.

Further, the use of a solvent having a low boiling point is not desirable because it increases the risk during transportation and storage. Especially in winter, there is a high probability that fire will be used in the surroundings for heating, etc. Therefore, the use of a solvent with a low boiling point increases the risk of fire. Therefore, until now, no water-based undercoat material has been found that can be used all year round and has stable adhesion performance and safety.

[0006] The "water-based finish coating material that can be coated below freezing point" described in JP-A-8-188727 is a water-based finish coating material that can be applied throughout the year from summer to winter, but it is often sucked. In many cases, it is not possible to obtain sufficient adhesion to the base or a relatively fragile base.
It has been desired to develop a composition that can be used below freezing and has excellent adhesiveness to a wide range of substrates, which is used as a water-based undercoating material.

[0007]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors in view of the above problems, (1) environment-friendly and low VOC, (2) concrete, slate board, etc. In order to improve the adhesion to inorganic building materials, it has excellent penetrability and base reinforcement, (3) excellent adhesion to various existing finish coating materials,
(4) Freezing and coagulation do not occur even at temperatures of -10 ° C to 40 ° C, and the coating material has excellent stability. (5) Undercoating material that has excellent adhesion to a wide range of topcoating materials. ,
It is important to satisfy the requirement of, and in order to obtain such properties, it is possible to achieve the present invention by obtaining the knowledge that it can be achieved by mixing specific components in specific proportions. It has been completed.

That is, the composition for an aqueous undercoat material of the present invention is characterized by comprising the following components (A) to (E). Component (A): Synthetic resin-based binder 5 to 40% by weight Component (B): Inorganic binder 5 to 40% by weight and 50 to 200 parts by weight with respect to 100 parts by weight of the component (A) Component (C): Polyhydric alcohol 0.5 to 3% by weight Component (D): Low molecular weight alcohol 0.5 to 7% by weight Component (E): Film forming aid 0.5 to 5% by weight

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION [I] Composition for water-based undercoat material (1) Constituent component (A) Component (A): Synthetic resin-based binder Component (A) which constitutes the composition for water-based undercoat material of the present invention A synthetic resin emulsion is used as the synthetic resin binder.

(A) Synthetic Resin Emulsion The synthetic resin emulsion is a synthetic resin emulsion obtained by emulsion polymerization, and specific examples thereof include acrylic resin copolymer emulsion or ethylene / vinyl acetate copolymer emulsion. You can

Acrylic Resin Copolymer Emulsion As the acrylic resin copolymer emulsion, acrylic resin emulsion, acrylic styrene resin emulsion,
Examples thereof include acrylic acid / vinyl acetate copolymer emulsion.

Ethylene / Vinyl Acetate Copolymer Emulsion As the ethylene / vinyl acetate copolymer emulsion, ethylene / vinyl acetate copolymer emulsion, ethylene
Examples thereof include vinyl acetate / acrylic acid copolymer emulsion.

Physical Properties These acrylic resin copolymer emulsions or ethylene
The vinyl acetate copolymer emulsion is generally a synthetic resin emulsion having a glass transition point of −20 to 60 ° C. and an average particle diameter of 1 μm or less. The synthetic resin emulsion is excellent in film forming property, can be uniformized on the surface of the base, and can help the adhesion with the overcoat material to obtain strong adhesiveness. However, since it is dispersed in water in the form of particles, the particle size is larger than that of the binder that is dissolved, and the permeability to the base cannot be expected. Therefore, a substrate having a poor surface condition is easily peeled off at the interface with the substrate, and a strong adhesive force cannot be expected.

On the other hand, when a water-soluble synthetic resin is used, since the synthetic resin is dissolved in water, the particle size is small and the permeability to the substrate can be expected, and a part of the film is formed on the surface layer. However, it is considered that the adhesiveness to the top coat material is also excellent. However, since the water-soluble synthetic resin dissolves in water, it has poor water resistance, and when used alone, there is a serious problem in quality.

Although the solvent-based synthetic resin has various problems as described in the section of the prior art under these conditions, it contains a large amount of organic solvent, and the future environment, safety, and resource situation. Is not desirable considering. Therefore, there is a problem in using any synthetic resin-based binder alone. In addition, when the water-soluble resin and synthetic resin emulsion are used in combination, the two are well compatible with each other, the permeation of the water-soluble resin is lost during film formation, and the film cannot be obtained with the synthetic resin emulsion for film formation. Further, there is a problem that the poor water resistance of the water-soluble resin deteriorates the original physical properties of the synthetic resin emulsion.

(B) Combination of Synthetic Resin-Based Binder and Inorganic Binder Then, as a result of intensive studies in expectation of the synergistic effect of the composite, the synthetic resin-based binder of the above-mentioned component (A) and It was confirmed that the combination with the inorganic binder of the component (B) was effective. On the other hand, in the case of a combination of a synthetic resin emulsion and an inorganic binder, since they are essentially foreign substances, they are not integrated even during film formation, and the permeability of the inorganic binder is deteriorated. It does not cause deterioration of physical properties. Therefore, the good points of both can be exerted as a synergistic effect. However, when using a synthetic resin emulsion and an inorganic binder together, it is necessary to pay attention to the stability.

(B) Component (B): Inorganic Binder (a) Inorganic Binder As the inorganic binder of the component (B) which constitutes the composition for an aqueous undercoating material of the present invention, a metal silicate (water glass, Examples thereof include lithium silicate, potassium silicate, sodium metasilicate, etc.) and colloidal silicic acid (colloidal silica). These inorganic binders may be used alone or in admixture of two or more. Among these inorganic binders, metal silicates are preferably used, and water glass is particularly preferably used.

(B) Mixing Ratio of Synthetic Resin Binder and Inorganic Binder In general, the inorganic binder is often alkaline with strong pH, and if added in a large amount to the synthetic resin emulsion, the stability of the emulsion is impaired. In many cases. However, if the amount is small, the permeability of the inorganic binder becomes insufficient. Therefore, it is necessary to select an appropriate combination ratio of the two and an additive that does not freeze even at a low temperature and ensures good workability. as a result,
It is important to add 50 to 200 parts by weight, preferably 50 to 150 parts by weight, and particularly preferably 70 to 120 parts by weight to 100 parts by weight of the synthetic resin binder as the component (A).

(C) Component (C): Polyhydric Alcohol As the polyhydric alcohol of the component (C) constituting the composition for an aqueous undercoating material of the present invention, ethylene glycol, propylene glycol, glycerin and the like can be mentioned. . These polyhydric alcohols may be used alone or in combination of two or more. Among these polyhydric alcohols, ethylene glycol and propylene glycol are preferably used, and propylene glycol is particularly preferably used. Usually, in order to prevent the coating material from freezing, polyhydric alcohol is often added alone in an amount of 0.5 to 2% by weight. However, in the case of the composition for a water-based undercoating material of the present invention, as compared with a normal water-based coating material. Since it is necessary to further lower the freezing temperature by 10 ° C. or more, if the polyhydric alcohol is added alone, the blending amount becomes too large, and if a large amount of antifreezing agent remains in the coating film after film formation. It causes a decrease in water resistance.

(D) Component (D): Low-Molecular Alcohol As the low-molecular alcohol of the component (D) which constitutes the composition for an aqueous undercoating material of the present invention, methanol, ethanol, isopropanol and the like having 1 to 4 carbon atoms, Preferably, linear low molecular weight alcohols of 1 to 3 can be mentioned. These low molecular weight alcohols may be used alone or in admixture of two or more. Among these low molecular weight alcohols, methanol and ethanol are preferably used, and ethanol is particularly preferably used. On the other hand, the compounding of a low molecular weight alcohol has the advantage that it does not deteriorate water resistance relatively because it volatilizes during film formation and does not remain in the coating film. However, when the low molecular weight alcohol is blended alone, condensation and freezing occur in the coating film due to the heat of vaporization during dry film formation. In order to solve these problems, the polyhydric alcohol as the component (C) and the low molecular weight alcohol as the component (D) are used together.

(E) Component (E): Film-forming auxiliary As the film-forming auxiliary of the component (E) constituting the composition for an aqueous undercoat material of the present invention, ethyl cellosolve, butyl cellosolve, propylene glycol monoethyl ether, Glycol ethers such as ethyl carbitol and butyl carbitol, glycol ether esters such as ethyl cellosolve acetate, propylene glycol monoethyl ether acetate, ethyl carbitol acetate and butyl carbitol acetate, 2,2,4-trimethyl-1, Examples thereof include esters such as 3-pentadiol monoisobutyrate and hydrocarbons such as xylene and terpene. These film-forming aids can be used alone or in admixture of two or more. Among these film-forming aids, ethyl cellosolve, butyl cellosolve, propylene glycol monoethyl ether, ethyl carbitol,
Glycol ethers such as butyl carbitol, ethyl cellosolve acetate, propylene glycol monoethyl ether acetate, glycol ether esters such as ethyl carbitol acetate, butyl carbitol acetate, and 2,2,4-trimethyl-1,3-pentadiol It is preferable to use esters such as monoisobutyrate, particularly ethyl cellosolve acetate,
Propylene glycol monoethyl ether acetate,
It is preferable to use glycol ether esters such as ethyl carbitol acetate and butyl carbitol acetate.

(2) Blending ratio Ingredients (A) -constituting the water-based undercoating composition of the present invention
The compounding ratio of (D) is 5 to 40% by weight, preferably 10 to 30% by weight of the synthetic resin binder as the component (A),
It is particularly preferably 15 to 25% by weight. If the amount of the synthetic resin-based binder compounded exceeds the above range, the viscosity becomes high and dilution becomes necessary. However, the addition of dilution water is not desirable considering freezing. On the other hand, if the amount is less than the above range, the binder component becomes insufficient and the performance is deteriorated. Further, the inorganic binder as the component (B) is 5 to 40% by weight,
Preferably 10 to 30% by weight, particularly preferably 15 to
It is 25% by weight. If the compounding amount of the inorganic binder exceeds the above range, the composition becomes unstable. On the other hand, if the amount is less than the above range, the adhesive force due to penetration will be insufficient.
However, the inorganic binder is 50 to 200 parts by weight, preferably 5 parts by weight, based on 100 parts by weight of the synthetic resin binder of the component (A).
It is necessary to mix in an amount of 0 to 150 parts by weight, particularly preferably 70 to 120 parts by weight. If the compounding amount of the inorganic binder exceeds the above range with respect to the synthetic resin binder, the composition becomes unstable. On the other hand, if the amount is less than the above range, the adhesive force due to penetration will be insufficient. Furthermore, component (C)
Polyhydric alcohol is 0.5 to 7% by weight, preferably 1 to
5 parts by weight, particularly preferably 2 to 3 parts by weight. If the amount of the polyhydric alcohol compounded exceeds the above range, the water resistance of the coated product will be reduced. On the other hand, if the amount is less than the above range, the antifreezing effect becomes insufficient. Also, the component (D)
0.5 to 7 parts by weight, preferably 1
-5 parts by weight, particularly preferably 2-5 parts by weight. When the compounding amount of the low molecular weight alcohol exceeds the above range, the composition is destabilized or the coating film surface is frozen due to heat of vaporization during film formation. On the other hand, if the amount is less than the above range, the antifreezing effect will be insufficient. Furthermore, the component (E)
0.5 to 5 parts by weight, preferably 1 to 3 parts by weight, and particularly preferably 2 to 3 parts by weight. If the blending amount of the film-forming aid exceeds the above range, the pressure-sensitive adhesive remains on the coating film. Further, if the amount is less than the above range, sufficient coating film performance cannot be exhibited.

(3) Preparation of Water-Based Undercoating Material Composition To prepare the water-based undercoating material composition of the present invention by blending the above-mentioned constituent components (A) to (E), the above-mentioned constituent component (A) is used. ~
The composition for water-based undercoating material of the present invention in an emulsion state in which a synthetic resin binder or an inorganic binder is dispersed in an aqueous medium by mixing (E) in the above-mentioned mixing ratio and stirring and mixing at room temperature under normal pressure. You can get things.

(4) Physical Properties of Aqueous Undercoating Composition The aqueous undercoating composition of the present invention obtained by the above-mentioned mixing, stirring and mixing is a synthetic resin binder or an inorganic binder in an aqueous medium. Since it is in an aqueous emulsion state in which particles are dispersed, the amount of solvent volatilized is significantly smaller than that of solvent-based undercoating materials that are commonly used, and there are global environmental problems, safety and health problems, and fire There are few problems such as danger due to. In addition, since the polyhydric alcohol and the low molecular weight alcohol are mixed in the aqueous medium, dew condensation and freezing do not occur even at low temperature, and low temperature film forming property is ensured. Further, under high temperature, even after moisture and low molecular weight alcohol are volatilized by drying, the polyhydric alcohol remains, making it difficult to cause a problem of poor drying and curing.

[II] Process (1) Coating The above-mentioned composition for water-based undercoating material of the present invention, which is used as a water-based undercoating material for interior / exterior coating of a building, is adhered to a substrate. If it does not have good properties and adhesion to the topcoat material, it cannot play its role.

(2) Base material The base material to which the water-based undercoating composition of the present invention is applied is a cement-based base material such as concrete, slate board, mortar, ALC panel, etc., which is a base material for construction, and a thin coating material. , A base on which an existing coating film of a finishing material for construction such as a multilayer coating material is formed, and the like. It is estimated that the adhesiveness with the base material is contributed by the inorganic binder contained as the component (B).

(3) Topcoat Material As the topcoat material to be applied after the above-mentioned composition for water-based basecoat material of the present invention is applied, a wide range of coating materials used as a finish coating material for construction can be used. Therefore, it can be used without selecting a finishing coating material for construction.
In particular, when the "water-based finish coating material capable of coating below freezing point" described in JP-A-8-188727 is used as the top coating material, the work is carried out in a water system and in a wide range of temperature from -10 ° C to 40 ° C. Therefore, it is a suitable water-based finishing coating material because it can be applied throughout the year from winter to summer.

[0028]

EXAMPLES The present invention will be described in more detail with reference to the following examples and comparative examples. [I] Evaluation method (1) Evaluation of storage stability The storage stability was evaluated by sealing the storage stability of the prepared water-based undercoat material composition at each temperature of 20 ° C, -3 ° C, and -10 ° C. JIS- for storage stability when stored in a metal container
It was measured and evaluated by changing the temperature by a method conforming to the low temperature stability of K-5400. The results were evaluated at the following stages. ○: Good △: Slightly bad ×: Poor −: Unable to test, etc.

(2) Film-forming property The film-forming property was evaluated by measuring the film-forming property at 20 ° C. and −10 ° C. when the prepared water-based undercoating composition was applied.
It was measured and evaluated by the drying test of IS-K-5400. The results were evaluated at the following stages. ○: Good △: Slightly bad ×: Poor −: Unable to test, etc.

(3) Water resistance The water resistance was evaluated by measuring the water resistance of the coating film coated with the prepared water-based undercoating composition by the water resistance of JIS-K-5400. The results were evaluated at the following stages. ○: Good △: Slightly bad ×: Poor −: Unable to test, etc.

(4) Adhesion Adhesion was evaluated by applying the prepared composition for a water-based undercoating material to a slate plate and an existing substrate at 20 ° C. and −10 ° C. according to JIS- It was measured and evaluated by the Mecatt tape method of K-5400. The results were evaluated at the following stages. ○: Good △: Slightly bad ×: Poor −: Unable to test, etc.

[II] Examples and Comparative Examples Examples 1 and 2 and Comparative Examples 1 to 6 Aqueous undercoating compositions prepared by mixing and agitating at the ratios shown in Table 1 were used for storage stability and production. The film properties, water resistance and adhesion were evaluated. The results are shown in Table 1.

[0033]

[Table 1]

Examples 3 to 5 and Comparative Examples 7 to 11 Aqueous undercoating compositions prepared by mixing and agitating at the ratios shown in Table 2 are storage stability, film-forming property, water resistance and adhesion. Was evaluated. The results are shown in Table 2.

[0035]

[Table 2]

[0036]

[Effects of the Invention] The water-based undercoating composition of the present invention as described above has a freezing problem even if the coating is applied in any season from winter at an ambient temperature of -10 ° C to summer at 40 ° C. Since it does not cause the problem of poor drying and curing, it can be applied throughout the year, exhibits high adhesion to a wide range of substrates, has low solvent volatilization, and contributes to global environmental issues and safety and health. It is a water-based undercoating composition that has less problems and problems such as danger due to fire.

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09D 133/00 C09D 133/00 (72) Inventor Yasushi Ana Anazawa 2-13-20 Yuzawa Minami, Morioka City, Iwate Prefecture Industrial Technology Center (72) Inventor Mitsunori Kimura 19-22 Uguisudani-cho, Shibuya-ku, Tokyo Incorporated Association of Japan Painting Industry (72) Inventor Yutarou Yoshida 19-22 Uguisudani-cho, Shibuya-ku, Tokyo Incorporated in Japan Painting Industry Association (72) Inventor Koji Takahashi 19-22 Uguisudani-cho, Shibuya-ku, Tokyo Incorporated Association in Japan Painting Industry (72) Shinji Kubota 7-chome Nishishinjuku, Shinjuku-ku, Tokyo No. 15-10 In Seven Chemical Co., Ltd. (72) Inventor Masahiro Konuki 7-15-10 Nishi-Shinjuku, Shinjuku-ku, Tokyo F-term in Seven Chemical Co., Ltd. (reference) 4J038 AA012 CB051 CG141 HA452 JA17 JA20 MA08 MA10

Claims (6)

[Claims] 1. A water-based undercoating composition comprising the following components (A) to (E). Component (A): Synthetic resin-based binder 5 to 40% by weight Component (B): Inorganic binder 5 to 40% by weight and 50 to 200 parts by weight with respect to 100 parts by weight of the component (A) Component (C): Polyhydric alcohol 0.5 to 3% by weight Component (D): Low molecular weight alcohol 0.5 to 7% by weight Component (E): Film forming aid 0.5 to 5% by weight 2. The water-based undercoating composition according to claim 1, wherein the synthetic resin binder is an acrylic resin copolymer emulsion or an ethylene / vinyl acetate copolymer emulsion. 3. The inorganic binder is a silicate metal salt.
Or the composition for an aqueous undercoating material according to 2). 4. The composition for an aqueous undercoating material according to claim 1, wherein the low molecular weight alcohol is an alcohol having 1 to 4 carbon atoms. 5. The composition for an aqueous undercoating material according to claim 1, wherein the polyhydric alcohol is a glycol having 2 to 3 carbon atoms. 6. The composition for an aqueous undercoating material according to claim 1, wherein the film-forming auxiliary is a glycol ether or a glycol ether ester.