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Multilayer coating film forming method and coated article

一种多层涂膜、涂膜的技术，应用在对表面涂布液体的装置、涂层、运输和包装等方向，能够解决多层涂膜耐水性降低、多层涂膜褶皱、涂膜平滑性及鲜明性降低等问题

Active Publication Date: 2016-08-17
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, in the coating film forming method described in Patent Document 1, when a water-based paint is used as the intermediate coating and the primer, there is a problem that due to the gap between the layers of the water-based intermediate paint and the water-based primer, The smoothness and sharpness of the coating film caused by mixed layers are reduced, the water resistance of the formed multilayer coating film is reduced, and wrinkles are generated in the formed multilayer coating film, etc.

Method used

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  • Multilayer coating film forming method and coated article
  • Multilayer coating film forming method and coated article
  • Multilayer coating film forming method and coated article

Examples

Experimental program
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Embodiment

[0506] Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. However, the present invention is not limited to these Examples. It should be noted that both "parts" and "%" are units based on mass standards. In addition, the film thickness of a coating film is based on a cured coating film.

[0507] [Hydroxyl-containing acrylic resin (A 1 ) manufacturing]

manufacture example 1

[0509] 120 parts of deionized water and "Adekaria Soap SR-1025" (trade name, manufactured by ADEKA Corporation, emulsified Agent, active ingredient 25%) 0.8 parts, stirred and mixed in nitrogen flow and heated to 80 °C.

[0510] Next, 5% of the total amount of the following monomer emulsion for a core part and 2.5 parts of a 6% ammonium persulfate aqueous solution were introduced into the reaction container, and kept at 80° C. for 15 minutes. Then, the remaining part of the monomer emulsion for core part was dripped in the reaction container maintained at the same temperature over 3 hours, and aging was performed for 1 hour after completion|finish of dripping. Next, the following shell monomer emulsion was added dropwise over 1 hour, aged for 1 hour, and then cooled to 30°C while slowly adding 3.8 parts of 5% 2-(dimethylamino)ethanol aqueous solution to the reaction vessel. , while filtering with a 100-mesh nylon cloth, it is discharged to obtain a water-dispersible hydroxyl-...

manufacture example 2～6

[0516] A water-dispersible hydroxyl-containing acrylic resin (A 1 -2)~(A 1 -6) an aqueous dispersion.

[0517] Table 1 shows water-dispersible hydroxyl-containing acrylic resin (A 1 -1)~(A 1 -6) Raw material composition (parts), solid content concentration (%), acid value (mgKOH / g) and hydroxyl value (mgKOH / g) of the aqueous dispersion.

[0518] [Table 1]

[0519]

[0520] It should be noted that the water-dispersible hydroxyl-containing acrylic resin (A 1 -1)~(A 1 -6) With core-shell type water-dispersible hydroxyl-containing acrylic resin (A 111 )quite.

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Abstract

The present invention provides a method for forming a multilayer coating film, which is excellent in smoothness, sharpness, and water resistance, and prevents or suppresses wrinkles. The method includes: step (1): water-based first colored paint (X) Coating the object to be coated, the process of forming an uncured first colored coating film on the object to be coated; Step (2): coating the object with the uncured first colored coating film with water-based second colored paint (Y) Coating, the operation of forming uncured second colored coating film thereon; Step (3): coating with clear paint (Z) has uncured first colored coating film and uncured second colored coating film The process of forming an uncured transparent coating film on the object to be coated; step (4): for the uncured first colored coating film, the uncured second colored coating film, and the uncured transparent coating film according to the situation The process of heating and hardening is performed; the water-based first colored paint (X) contains (A) a hydroxyl-containing resin and (B) a blocked polyisocyanate compound having a specific blocked isocyanate group.

Description

technical field [0001] The invention relates to a method for forming a multilayer coating film and a coated article. Background technique [0002] In the past, as a method of forming a coating film on an automobile body, the following method has been widely used: applying electrophoretic coating to the object to be coated, curing it by heating, and then sequentially (i) applying an intermediate coating, and heating the intermediate coating. Step 3 of the process of curing the coating film, (ii) applying the base coat and preheating (preheating) the base coat, and (iii) applying the clear coat and curing the clear coat by heating Coating 2 drying method; and sequentially carry out (i) the process of applying the intermediate coating and curing the intermediate coating film by heating, and (ii) applying the top coating and curing the top coating film by heating. Apply 2 bake methods. [0003] Generally, the above-mentioned 3-coating-2-baking method uses a base coating materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D1/36B05D7/24C08G18/80C09D5/00C09D175/04
CPCC08G18/6225C08G18/792C08G18/8064C08G18/0866C09D175/12C08G18/4063C08G18/423C09D7/00C08G18/8093C08G18/8096C09D175/04Y10T428/2998B05D7/572
Inventor 北川博视北园和明小畑政示
Owner KANSAI PAINT CO LTD
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