Thermosetting water-based coating composition and method of forming coating film

A composition and thermosetting technology, applied in multi-color effect coatings, coatings, devices for coating liquids on surfaces, etc., can solve problems such as difficulty in uniformly distributing colored pigments and obtaining good colors

Inactive Publication Date: 2007-06-27
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a large proportion of the emulsion resin is used in a metal coating composition containing the emulsion resin and the water-soluble resin to avoid sagging of the resulting coating film, since the coating film contains a large proportion of the continuous phase derived from the water-soluble resin The resin particles of the emulsion method, the result makes it difficult to uniformly distribute the coloring pigment
So it's hard to get a good color in this case

Method used

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  • Thermosetting water-based coating composition and method of forming coating film

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0192] Production Example 1 Production of Hydroxyl and Carboxyl Water-Soluble Resin (A)

[0193] Put 35 parts of propylene glycol monopropyl ether in a flask and heat it to 85°C, then add 30 parts of methyl methacrylate, 20 parts of 2-ethylhexyl acrylate, 29 parts of n- A mixture of butyl ester, 15 parts of hydroxyethyl acrylate, 6 parts of acrylic acid, 15 parts of propylene glycol monopropyl ether and 2.3 parts of 2,2'-azobis(2,4-dimethylvaleronitrile). After the addition was complete, the resulting mixture was aged for 1 hour. Next, a mixture of 10 parts of propylene glycol monopropyl ether and 1 part of 2,2'-azobis(2,4-dimethylvaleronitrile) was additionally added dropwise to the flask over 1 hour. After the addition was complete, aging was performed for 1 hour. The aged mixture was neutralized with 7.4 parts of diethanolamine to obtain a 55% solution of water-soluble acrylic resin (A-1) having a weight average molecular weight of 58,000, a hydroxyl value of 72 mg KOH / g ...

manufacture example 4

[0199] Production Example 4 Production of Phthalocyanine Blue Pigment Paste

[0200] In a 225 ml glass bottle, 16.7 parts of phthalocyanine blue pigment (trade name "CYANINEBLUE G-314", product of Sanyo Color Works, Ltd.), 16.7 parts of water-soluble acrylic resin (A -1) solution and 80.8 parts of deionized water. In addition, 130 g of glass beads having a diameter of 1 mm were added as a dispersion medium, followed by dispersion for 1 hour with a paint shaker. The glass beads were then removed to obtain phthalocyanine blue pigment paste (ii).

Embodiment 1

[0201] The manufacture of embodiment 1 thermosetting waterborne metal coating composition

[0202] A solution of 50 parts by solid of the water-soluble acrylic resin (A-1) obtained in Production Example 1, 10 parts by solid of the internally crosslinked acrylic emulsion method resin (D1-1) obtained in Production Example 2 , 30 parts by solids of melamine resin (trade name "Cymel 325", product of Mitsui Cytec, Ltd.) and 10 parts by solids of urethane emulsion method resin (trade name "U-COAT UX8100", product of Sanyo Chemical Industries , Ltd.) mixed together. Next, it was mixed with 15 parts by solid of the aluminum flake dispersion (i) obtained in Production Example 3.

[0203] The resulting mixture was diluted with deionized water to a solid content of 20%, to obtain a thermosetting water-based silver metal coating composition WM-1. The coating composition at 20°C and 1 sec -1 has a viscosity of 220mPa·s at a shear rate of 20°C and 100 seconds -1 It has a viscosity of 12...

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Abstract

A thermosetting water-based coating composition which comprises (A) 100 parts by weight of a hydroxylated and carboxylated water-soluble resin having a weight-average molecular weight of 500-200,000, a hydroxy value of 1-200 mg-KOH / g, and an acid value of 10-100 mg-KOH / g and (B) 10-100 parts by weight of a brightening pigment and which is to be applied so as to give a cured film having a thickness of 3,000-8,000 nm, characterized in that the viscosity of the coating film applied which has a solid concentration of 40 wt.% is in the range of 4*102 to 1*104 mPa.s as measured at 20 DEG C and a shear rate of 0.1 sec-1. Also provided is a method of coating film formation which comprises using the coating composition.

Description

technical field [0001] The present invention relates to a thermosetting water-based coating composition and a method for forming a coating film. Background technique [0002] When forming an outer coating comprising one or two base coats and one or two clear coats on a substrate such as an automobile body by a two-coat-and-bake method, a three-coat-and-bake method, etc., a thermosetting water-based The coating composition forms a base coat. [0003] In recent years, the thermosetting aqueous coating composition has been required to be capable of forming a coating film with a high-quality appearance. Specifically, when the coating composition has a silver metallic color, the coating composition is required to be capable of forming a coating film having excellent brilliance (brilliance) and excellent flip-flop properties. Angle-dependent light fall refers to the difference in whiteness (brightness) between the surface of the coating film seen from the front (highlighted part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D201/02B05D1/36B05D5/06B05D7/24C09D5/02C09D5/29C09D7/12C09D133/00
CPCC09D133/02C08J7/047C09D201/06C09D5/29C08L2312/00C08J7/0427
Inventor 桧原笃尚成田信彦
Owner KANSAI PAINT CO LTD
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