Method for coating metal materials and coated materials

A technology of metal materials and coating methods, which is applied to the metal material coating process, the device for coating liquid on the surface, coating, etc., and can solve the problems that the coating method cannot be used, the adhesion is poor, and the repair is impossible.

Inactive Publication Date: 2004-04-07
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the recoating of the active energy ray-curable coating film causes poor adhesion, it is practically impossible to repair it.
Therefore, this coating method cannot be used

Method used

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  • Method for coating metal materials and coated materials
  • Method for coating metal materials and coated materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0079] Hereinafter, the present invention will be described in detail by way of examples and comparative examples. In addition, in the compounding of each example, 'part' or '%' represent 'parts by mass' and '% by mass', respectively.

[0080] [Synthesis of Powder Coatings]

Synthetic example

[0082] By 33 parts of Epot-NT111 (epoxy resin of epoxy equivalent 475, manufactured by Dongdu Chemical Co., Ltd.), 33 parts of Epot-NT112 (epoxy resin of epoxy equivalent 650, manufactured by Dongdu Chemical Co., Ltd.), curing catalyst ( 0.05 parts of imidazole), 2.5 parts of surface conditioner, 1 part of matting agent, 20 parts of white pigment (titanium dioxide), 10 parts of extender pigment (alumina and silicon dioxide) and 4.1 parts of anhydride compound of imidazoline as curing agent The raw materials were mixed for about 3 minutes in a mixer (Super Mikisa) (manufactured by Nippon Spindle Manufacturing Co., Ltd.), and melt-kneaded at about 100° C. with a kneading extruder (manufactured by Busu Corporation).

[0083] The resulting molten kneading product was cooled to room temperature, coarsely pulverized, pulverized with a particle pulverizer ("Jietomil IDS-2 type", manufactured by Niyu Matchuk Co., Ltd., Japan), and classified with a 300-mesh sieve to obtain a volume ave...

Embodiment 1

[0086] On the surface of the sample (magnesium alloy die-casting, 50mm×200mm×2mm), a pencil hardness tester with a sapphire needle with a diameter of 5μm is placed on the front end, and a weight of 4.9N is added to form a person with a width of 50μm and a depth of 30μm. Work injury.

[0087] The powder coating produced in the above synthesis example was electrostatically coated on the sample caused by the above-mentioned artificial damage so that the coating film thickness after drying was 25 μm, and the temperature of the sample was kept within about 10 minutes in the drying oven. Raise the temperature from 20°C to 160°C, keep the temperature for 5 minutes, and dry the coating film. During this period, the change in viscosity of the powder coating over time was measured with a viscometer ("Solikit Meter MR300", manufactured by UBM Co., Ltd.), and the minimum melting viscosity was 1.7 Pa·s.

[0088] On the coating film formed by this powder coating, an acrylic resin-based sol...

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PUM

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Abstract

Provided is a system capable of forming a coating film having sufficient coating film hardness, excellent abrasion resistance and excellent hue appearance on the surface of a metal material, which may have a surface flaw, such as a magnesium alloy material and a coating film uniform in hue appearance even to a coated article wherein a plastic material and a metal material are combined such as a housing or the like for a portable telephone, and a coated article using this system. A method of coating metal material is a coating system which forms a cured coating film with a film thickness of 20-40 [mu]m on the surface of a metal material using a powder paint and forms a colored coating film on the cured coating film using a solvent type thermoplastic acrylic resin paint and further forms a transparent coating film on the colored coating film using a UV curable clear paint. The powder paint to be used has the molten lowest viscosity of 1.0-2.0 Pas under a baking curing condition.

Description

technical field [0001] The present invention relates to a coating method for coating metal materials such as magnesium alloy materials, and also relates to coated objects such as home appliances, OA equipment, mobile equipment and other electronic equipment, and automobile parts coated by the system. Background technique [0002] On metal materials with many surface defects (wrinkles, dents, pits) such as magnesium alloy materials, as disclosed in JP-A No. 2001-11672 and JP-A No. 2002-177878, the The paint is a solvent-based or powder-based thermosetting epoxy resin coating, and if necessary, a solvent-based thermosetting acrylic resin coating containing glossy materials such as aluminum flakes and mica flakes is applied to the surface. However, this method has the following problems. [0003] (1) The function of the solvent-based thermosetting epoxy resin coating used in the primer layer to conceal the surface defects of the metal material is insufficient, and the smoothne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/36B05D1/06B05D3/10B05D5/06B05D7/14B05D7/24B32B15/08C23C26/00C23C28/00
Inventor 石原嘉孝矶野俊己川边统也
Owner NIPPON PAINT CO LTD
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