Aqueous primer composition and coating method using same

A water-based primer and composition technology, applied in primers, devices for coating liquids on surfaces, coatings, etc., can solve the problem of reduced water resistance of multi-layer coatings, inability to obtain sufficient paintability, and white base coats Achieves the effect of excellent water resistance by eliminating problems such as reduced electrical conductivity

Inactive Publication Date: 2012-10-10
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the water-based non-conductive colored base coat is applied wet-on-wet electrostatically after the above-mentioned water-based primer is applied, the water-based non-conductive white base coat is sequentially electrostatically applied, especially for the white pearl tone. In the case of a water-based interference color base coat, the electrical conductivity of the white base coat may decrease after application, and sufficient paintability may not be obtained.
In addition, if the amount of conductive filler in the water-based primer is increased in order to ensure electrical conductivity, there is a problem that the water resistance of the multilayer coating film obtained will decrease.

Method used

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  • Aqueous primer composition and coating method using same
  • Aqueous primer composition and coating method using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] With the aqueous dispersion (A-1) (note 1) of 30 parts of modified polyolefins in terms of solid content mass, 25 parts of water-based acrylic resin (B-1) (note 4) in terms of solid content mass, in solid 25 parts of water-based acrylic resin (B-2) (Note 5) in terms of component mass, 20 parts of blocked polyisocyanate compounds (C-1) (Note 7) in terms of solid content mass and 150 parts of conductive pigments (D- 1) (Note 9) Mix according to the conventional method, dilute with deionized water to make the solid content 40%, and prepare the water-based primer (1).

Embodiment 2~13 and comparative example 1~6

[0117] Except that the blending composition in Example 1 was set as shown in the following Table 1, the same operation was performed as in Example 1 to obtain water-based primers (2)-(19). The storage stability of each prepared water-based primer was evaluated. The results are also shown in Table 1 below.

[0118] The blends in Table 1 are expressed in terms of solid content, and (Note 1) to (Note 15) in Table 1 are as follows.

[0119] (Note 1) Aqueous dispersion (A-1) of modified polyolefin: 8% by mass of maleic acid was added to an ethylene-propylene copolymer (5% ethylene content) produced using a metallocene catalyst. Modified polyolefin obtained by modification with dimethyl ethanolamine has a melting point of 80°C, a Mw of about 100,000, and a Mw / Mn of about 2.1. A dispersion obtained by water dispersion using 10 parts of emulsifier.

[0120] (Note 2) Aqueous dispersion of modified polyolefin (A-2): "Hardlen (Hardlen) NA-3002", aqueous dispersion of non-chlorinated pol...

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Abstract

Disclosed is an aqueous primer composition which contains (A) an aqueous dispersion of a modified polyolefin, (B) an aqueous urethane resin and / or an aqueous acrylic resin, (C) a pyrazole blocked polyisocyanate compound and (D) a conductive pigment. The content ratio of the pyrazole blocked polyisocyanate compound (C) is within the range of 5-50% by mass relative to the total solid content of the component (A), the component (B) and the component (C). The conductive pigment (D) contains (D-1) a conductive metal oxide, and the content of the conductive pigment (D) is within the range of 50-200 parts by mass per 100 parts by mass of the total resin solid content in the composition. Also disclosed is a method for coating a plastic molded article, which uses the composition.

Description

technical field [0001] The present invention relates to a water-based primer capable of imparting high-brightness or high-chroma coloring to plastic moldings such as automobile bumpers, having sufficient conductivity, and forming a primer coating film excellent in water resistance and adhesion even in thick films Paint composition and coating method using the composition. Background technique [0002] Plastic raw materials used for automobile bumpers etc. usually have about 10 10 The surface resistance value above Ω / □ is difficult to directly apply paint to such plastic molded products by electrostatic coating method, so at present, the surface of such raw materials is first coated with conductive primer, and then electrostatically painted for the purpose of coloring Topcoat (for example, refer to Patent Document 1). [0003] The above-mentioned plastic raw materials usually have dark colors such as black, and when coating light-colored or low-masking topcoats, high-maskin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/00B05D5/12B05D7/24C09D5/24C09D5/29C09D7/12C09D123/26C09D133/00C09D171/02C09D175/04C09D7/62
CPCC09D7/1225C08K3/22C09D175/04C09D133/14C09D123/26C09D5/24B05D3/005C08G18/807C08K9/02B05D7/02C09D5/002C09D7/62C08L2666/02C08L23/26
Inventor 笠原尚子胜田英明富崎靖洋小仓一隆村田浩殿村浩规
Owner KANSAI PAINT CO LTD
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