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Aqueous coating composition

A technology of water-based paint and composition, applied in the direction of coating, latex paint, etc., can solve the problems of easy adhesion of pollutants, decrease of surface gloss, and barriers to painting operation, and achieve excellent paint stability and coating film pollution resistance, The effect of suppressing the increase of paint viscosity and making the painting operation easier

Inactive Publication Date: 2008-11-26
SK KAKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The organosilicate etc. used in the paint described in Patent Document 1 has an alkoxysilyl group reactive with water, and if it is added to a water-based paint, the organic silicate etc. The following problems arise: the viscosity of the paint rises sharply in a short period of time, and the overall gelation of the paint brings obstacles to the painting operation, and the compatibility between the water-based paint and organic silicate is poor, and after mixing Condensate
In particular, in high-gloss water-based paints, which are generally called glossy paints, there is a disadvantage that the surface gloss is extremely reduced due to this poor compatibility.
Furthermore, coating is performed immediately after mixing, and there is a disadvantage that sufficient stain resistance cannot be obtained even when a coating film is formed.
Especially in the initial stage of coating film formation, due to the adhesiveness of organosilicate, etc., there is a problem that pollutants tend to adhere instead.
[0007] In Patent Document 2, it is disclosed that in order to improve the stain resistance of water-based paints containing aggregates such as synthetic resin emulsions and ground natural stones, organosilicates, etc. are mixed as decontamination agents. This paint also has the same problem as the above-mentioned Patent Document 1
In particular, in Patent Document 2, there is also a problem that the sharpness of image of the coating film is impaired.

Method used

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  • Aqueous coating composition
  • Aqueous coating composition
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Examples

Experimental program
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Effect test

Embodiment

[0133] Examples are given below to clarify the characteristics of the present invention. In Examples, coating materials were produced using each raw material shown below.

[0134] Emulsion A: acrylic resin emulsion (methyl methacrylate-styrene-acrylic acid-2-ethylhexyl-methacrylic acid copolymer, pH 7.5, solid content 50% by weight, minimum film forming temperature 25°C )

[0135] Emulsion B: acrylic resin emulsion (methyl methacrylate-styrene-cyclohexyl methacrylate-(acrylic acid-2-ethylhexyl)-methacrylic acid copolymer, pH is 7.4, solid content is 50% by weight, the minimum film forming temperature is 22°C)

[0136] Emulsion C: Acrylic resin emulsion (styrene-methyl methacrylate-(2-ethylhexyl acrylate) copolymer, minimum film forming temperature 20°C, pH 7.8, solid content 50% by weight)

[0137] ·Water-soluble resin A: Hydroxyethyl cellulose powder

[0138] ・Water-soluble resin B: 3% by weight aqueous solution of galactomannan

[0139] ・Coloring pigment: Titanium oxide...

Synthetic example 1

[0158] Add 500 parts by weight of low-polluting agent A to a reaction vessel equipped with a reflux condenser and stirring blades, and slowly drop 0.3 parts by weight of trifluoroethanol while stirring. Next, the temperature was raised to 80° C., and the stirring was continued for 24 hours, and then left to cool to room temperature to obtain the decontamination agent B.

Synthetic example 2

[0160] 500 parts by weight of the low-polluting agent A was added to a reaction vessel equipped with a reflux condenser and a stirring blade, and 1.0 parts by weight of tetramethoxysilane was slowly dripped in while stirring. Next, the temperature was raised to 80° C., and stirring was continued for 24 hours, and then left to cool to room temperature to obtain a decontamination agent C.

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Abstract

Disclosed is an aqueous coating composition which enables to simplify storage of an anti-staining agent. The aqueous coating composition is excellent in coating stability when the anti-staining agent is mixed with an emulsion resin coating material, and also excellent in anti-contamination properties. Specifically, the aqueous coating composition essentially contains a synthetic resin emulsion (A) having a pH of not less than 4.0 and not more than 10.0 and a neutral silica sol (B) having a particle diameter of 1-200 nm and a pH of not less than 5.0 and less than 8.5. The aqueous coating composition contains 0.1-50 parts by weight of the neutral silica sol (B) component per 100 parts by weight of the solid content of the synthetic resin emulsion (A) in terms of solid content.

Description

technical field [0001] The present invention relates to aqueous coating compositions having excellent stain resistance. The composition of the present invention can be used in the surface processing of various raw materials such as metal, glass, ceramic tile, concrete, wall board, extruded board, plastic, etc., and can be mainly used in the main body protection of buildings, civil structures, etc. Background technique [0002] In recent years, in the field of coatings used for architectural and civil engineering structures, attempts have been made to shift from solvent-based coatings using organic solvents as solvents to water-based coatings using water as a solvent. This is for the purpose of reducing the health damage of painting operators and residents, or for the purpose of reducing air pollution. This kind of water-based paint is developing year by year. [0003] Among the known water-based paints, there are those that have performances at the same level as solvent-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/02C09D7/12C09D133/00
Inventor 尾上诚一上村茂人
Owner SK KAKEN CO LTD
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