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Method for forming multi-layer coating film

A multi-layer coating film and coating film technology, which is applied to coatings, devices for coating liquids on surfaces, and surface pretreatment, etc., can solve problems such as water resistance and adhesion of coating films, and achieve excellent metallic luster, excellent Effect of Water Resistance Adhesion

Active Publication Date: 2019-08-09
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PTL 9 does not mention the water resistance of the coating film

Method used

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  • Method for forming multi-layer coating film
  • Method for forming multi-layer coating film
  • Method for forming multi-layer coating film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0278] The present invention is described in more detail below with reference to Examples and Comparative Examples. However, the present invention is not limited to these Examples. Both "part" and "%" are by mass.

[0279] Preparation of Aqueous Dispersion of Acrylic Resin

preparation example 1

[0281] 128 parts of deionized water and 2 parts of "Adeka Reasoap SR-1025" (trade name, manufactured by Adeka, emulsifier, active ingredient 25%) were placed in a Inlet tube and dropping funnel to the reaction vessel. The mixture was stirred and mixed under nitrogen flow, and heated to 80°C.

[0282] Subsequently, 1% of the total amount of the monomer emulsion for the core portion described below and 5.3 parts of a 6% ammonium persulfate aqueous solution were introduced into the reaction vessel, and kept at 80° C. for 15 minutes. Thereafter, the remaining monomer emulsion for the core portion was added dropwise to the reaction vessel kept at the same temperature over a period of 3 hours. After the dropwise addition was complete, the mixture was aged for 1 hour. Subsequently, a monomer emulsion for the shell portion described below was added dropwise over a period of 1 hour, followed by aging for 1 hour. Thereafter, the mixture was cooled to 30° C., while gradually adding 40...

preparation example 2

[0287] 35 parts of propylene glycol monopropyl ether were placed in a reaction vessel equipped with a thermometer, thermostat, stirrer, reflux condenser, nitrogen inlet tube, and dropping funnel, and heated to 85°C. Subsequently, 30 parts of methyl methacrylate, 20 parts of 2-ethylhexyl acrylate, 29 parts of n-butyl acrylate, 15 parts of 2-hydroxyethyl acrylate, 6 parts of acrylic acid, 15 parts of propylene glycol monopropyl ether and A mixture of 2.3 parts of 2,2'-azobis(2,4-dimethylvaleronitrile) was added dropwise thereto over 4 hours. After the dropwise addition was complete, the mixture was aged for 1 hour. Then, a mixture of 10 parts of propylene glycol monopropyl ether and 1 part of 2,2'-azobis(2,4-dimethylvaleronitrile) was further added dropwise thereto over 1 hour. After the dropwise addition was complete, the mixture was aged for 1 hour. 7.4 parts of diethanolamine was further added thereto, whereby an acrylic resin solution (R-2) having a solid content of 55% wa...

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PUM

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Abstract

Provided is a method for forming a multi-layer coating film comprises steps (1) to (5) below, performed in sequence: (1) a step in which a colored coating is applied on an object to be coated and heated to form a colored coating film; (2) a step in which a base coating is applied on the colored coating film formed in step (1) to form a base coating film; (3) a step in which a metallic pigment dispersion is applied on the base coating film formed in step (2) to form a metallic coating film; (4) a step in which a clear coating is applied on the metallic coating film formed in step (3) to form aclear coating film; and (5) a step in which the uncured base coating film, uncured metallic coating film and clear coating film formed in steps (2) to (4) are heated to simultaneously cure these threecoating films. Therein, the metallic pigment dispersion contains water, a surface conditioner, a scaly metallic pigment and a viscosity regulator, and the solids content ratio is 0.5-10% by mass.

Description

technical field [0001] The invention relates to a method for forming a multilayer coating film. Background technique [0002] The purpose of applying coatings is mainly to protect materials and to impart an excellent appearance. For industrial products, excellent appearance, especially "texture", is important to enhance their product capabilities. Although consumers desire the texture of various industrial products, luster like metal or pearl (hereinafter referred to as "metallic luster") is desired in the fields of automobile casings, automobile components, home appliances, etc. recently. [0003] Metallic luster is a texture characterized by a non-grainy surface, such as a mirror-polished surface, which, when viewed near perpendicular to the coated panel, appears shiny (high-shine), while relatively , the coated panel appears dull (dark) when viewed obliquely to the coated panel. That is, there is a large difference in brightness between the highlighted area and the dar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/38B05D3/02B05D5/06B05D7/24
CPCB05D5/06B05D7/577B05D3/0254B05D5/068B05D7/572
Inventor 伊藤政之纪平祐志村田浩大村匡弘
Owner KANSAI PAINT CO LTD
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