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Method for coating plastic molded article

A coating method and plastic molding technology, which is applied to the surface coating liquid device, coating, thin material treatment, etc., can solve the problems of insufficient drying and curing, and achieve excellent recoating adhesion, Excellent durability effect

Active Publication Date: 2009-09-09
KANSAI PAINT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the method described in the above-mentioned Japanese Patent Application Laid-Open No. 2005-42001, although the dryness and curability in the two-coating-one-baking mode have been improved, the water-based primer and the water-based substrate are coated by the three-coating-one-baking mode. In the three-layer coating method of paint and varnish paint, even if the same varnish paint is used, sufficient drying and curing properties may not be obtained when baking at low temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0083] Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these Examples. In addition, "parts" and "%" mean "parts by weight" and "% by weight" unless otherwise specified.

[0084] Water-based polyolefin resin (A):

[0085] The aqueous dispersion of maleic anhydride-modified chlorinated polyolefin has a maleic acid addition amount of 2.2% by weight, a chlorine content of 14%, and a weight average molecular weight of about 60,000.

[0086] Water-based acrylic resin (B):

[0087] Acrylic resin emulsion, molecular weight 300000, acid value 10mgKOH / g, hydroxyl value 9mgKOH / g, calculated Tg50℃, calculated SP8.8.

[0088] Waterborne polyurethane resin (C):

[0089] "UCOAT UX-5210", a polycarbonate-based polyurethane resin, manufactured by Sanyo Chemical Industry Co., Ltd., a trade name, and a solid content of 32%.

[0090] Hydroxyl-containing water-based acrylic resin (D-1)

[0091] Add 145 parts o...

preparation example 1

[0103] Add 38 parts of melamine resin (E) 38 parts (about 30 parts by solid content weight), the acrylic resin emulsion (D) of solid content 25.2% in polyester resin (D-2) 30 parts while stirring. -1) 119 parts (approximately 30 parts by solid content weight) and 25 parts (10 parts by solid content weight) of water-based polyurethane resin (C) of 40% solid content. Then, 20 parts of "Alumi Paste GX180A" (manufactured by Asahi Kasei Co., Ltd., trade name, aluminum flake paste) was added as an aluminum pigment component while stirring and mixed and dispersed, and dimethylethanolamine and deionized water were further added to adjust the pH to 8. 0. Viscosity up to 40 seconds at 20° C. in the measurement using Ford Cup No. 4 to obtain a water-based base coat paint (II-1).

preparation example 2

[0105] In addition to changing the compounding amount of the melamine resin (E) in Preparation Example 1 into 25 parts (20 parts in terms of solid content weight), and changing the compounding capacity of water-based polyurethane resin (C) into 50 parts (in terms of solid content weight) 20 parts), other than the same method as in Preparation Example 1, to obtain a water-based base coat paint (II-2).

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PUM

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Abstract

Disclosed is a method for coating a plastic molded article which enables to form a three-layer coating film which is composed of a water-based primer, a water-based base coating and a clear coating and excellent in adhesion to the plastic molded article, water resistance and durability even when a low-temperature baking is carried out at a temperature not more than 100 DEG C in a three-coat one-bake system.

Description

technical field [0001] The present invention relates to a coating method for a plastic molded product capable of forming a coating film excellent in adhesion, water resistance, durability, etc. to the plastic molded product even when baked at a low temperature. Background technique [0002] In recent years, plastic molded products have been widely used as interior and exterior parts of automobile bodies. As a coating method for this plastic molding, for example, a coating method using a three-coat-one-bake method is known, that is, a water-based primer, a water-based base paint (water-based paint) and a clear paint (clear paint) are sequentially coated. After that, heating is performed while simultaneously baking and curing the 3-layer coating film. (For example, refer to JP-A-10-296171, JP-A-2004-331911, and JP-A-2005-905). [0003] In recent years, there has been a strong demand for energy saving in the coating process, and among the above-mentioned coating methods, a me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/02B05D1/36
CPCB05D3/0254C09D123/02B05D2520/00B05D2503/00B05D2507/00B05D7/572B05D7/02Y10T428/31573C08L2666/02B05D2425/02B05D2425/01B05D2420/01
Inventor 田中正树中尾泰志植野成人胜田英明殿村浩规汤浅宽一须藤尊久
Owner KANSAI PAINT CO LTD
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