High-solid coating composition

A technology of high solid content and composition, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of insufficient acid resistance of the coating film and difficult differentiation of high solids, and achieve excellent pot life, excellent appearance of finished products, and pot life. excellent effect

Inactive Publication Date: 2017-09-19
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, this clear paint has the following problems: it is difficult to differentiate high solids, and the acid resistance of the coating film is insufficient due to the large amount of melamine resin.

Method used

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  • High-solid coating composition

Examples

Experimental program
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Effect test

Embodiment

[0173] Hereinafter, the present invention will be described more concretely with reference to Examples and Comparative Examples. However, the present invention is not limited to these Examples. In addition, "parts" and "%" are based on mass.

[0174] Production of secondary hydroxyl-containing acrylic resin (A)

manufacture example 1

[0176] In an acrylic resin reaction tank equipped with a stirrer, a thermometer, and a reflux condenser, 27 parts of Swasolve 1000 (aromatic solvent, manufactured by Cosmo Oil Co., Ltd.) and methoxypropyl acetate (KH Neochem Co., Ltd. (manufactured by KH Neochem Co., Ltd., ester solvent) 5 parts, heated and stirred under nitrogen gas, and stopped feeding nitrogen gas after reaching 150 ° C. 20 parts of styrene, 2-hydroxypropyl acrylate 32.5 part, 46.8 parts of isobornyl acrylate, 0.7 part of acrylic acid and 6.0 parts of di-t-amyl peroxide (polymerization initiator) were added dropwise over 4 hours.

[0177] Then, after aging at 150 degreeC for 1 hour, it cooled, and further added and diluted 21 parts of isobutyl acetates, and obtained the hydroxyl group containing acrylic resin (A1) of 65 mass % of solid content concentration. The weight-average molecular weight of the hydroxyl-containing acrylic resin (A1) was 5500, the hydroxyl value was 139 mgKOH / g, the acid value was 5.5 ...

manufacture example 2 to 10

[0179] In Production Example 1, except that the monomer mixture was set to a monomer mixture having the composition shown in Table 1, the same operation was carried out as in Production Example 1 (adjustment was made so that the amount of the polymerization initiator became the desired weight average molecular weight) to obtain hydroxyl-containing acrylic resins (A2) to (A10). Table 1 also shows the weight average molecular weight, hydroxyl value, acid value, and glass transition temperature (Tg (° C.)) calculated from the monomer composition.

[0180] In addition, hydroxyl group-containing acrylic resins (A8) to (A10) are acrylic resins for comparative examples.

[0181] Table 1

[0182] Manufacturing example number (No.)

[0183]

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Abstract

The invention provides a high-solid coating composition and a multilayer paint film forming method employing the same, wherein the high-solid coating composition is capable of obtaining a coating film excellent in pot life, excellent in scratch resistance, acid resistance, and finished appearance (moisture-resistant property). The high-solid coating composition comprises (A) acrylic resin containing secondary hydroxyl having a weight-average molecular weight of 3000-7000, (B) an aliphatic polyisocyanate compound and / or a derivative thereof, (C) an alkyl etherified melamine resin having a weight-average molecular weight of 1,000 or less, and (D) a sulfonate compound and / or a phosphate compound, wherein the amount of the component (C) to the total amount of the component (B) is within a range of 1.5 to 20% by mass.

Description

technical field [0001] The present invention relates to a high-solid coating composition and a method for forming a multilayer coating film using the coating composition. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, it is required to reduce volatile organic compounds (VOC) emitted from paints, and water-based paints are rapidly being replaced by solvent-based paints in various fields. [0003] In the painting of automobiles, a large amount of solvent-based paints have been used in the past, and it has become a top priority to reduce the VOC emitted by these paints. Regarding the various paints used in the primer, intermediate and top coating processes of automobiles, water-based Coatings are replacing organic solvent-based coatings, and painting with water-based coatings is now becoming mainstream. [0004] However, in top-coating clear paints, a high level of coating film performance (scratch resistance, acid resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D161/32C09D7/12C08G18/62C08G18/73
CPCC09D175/04C08G18/6229C08G18/73C09D7/63C08G2150/00C08L61/32C08K5/42
Inventor 鹈泽裕二北川博视
Owner KANSAI PAINT CO LTD
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