Coating composition and coated article

A composition and coating technology, which is applied in the direction of anti-corrosion coatings, electrophoretic coatings, epoxy resin coatings, etc., can solve the problems of insufficient adaptability of electrophoretic coatings, and achieve excellent exposure corrosion resistance, easy manufacture, and excellent coating stability Effect

Inactive Publication Date: 2009-06-03
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the resin composition for gas-barrier cationic electrophoretic coatings described in Patent Document 1 improves corrosion resistance, particularly It is excellent in exposed corrosion resistance, but not suitable for electrophoretic coating on alloyed hot-dip galvanized steel sheets

Method used

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  • Coating composition and coated article
  • Coating composition and coated article
  • Coating composition and coated article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0073]Hereinafter, the present invention will be described in more detail through production examples, examples, and comparative examples, but the present invention is not limited thereto. "Part" in each example shows a mass part, and "%" shows a mass %.

[0074] Manufacture of modified epoxy resin (A)

manufacture example 1

[0075] Production example 1 Production example of modified resin solution No. 1 (for example)

[0076] Add 840 parts of jER828EL (Note 2), 160 parts of hydroquinone, and 0.8 parts of tetrabutylammonium bromide to a flask with an inner volume of 2 liters equipped with a thermometer, a reflux cooler and a stirrer, and react at 160°C to ring The oxygen equivalent reaches 650. Then, 250 parts of ethylene glycol monobutyl ether was added, and the mixture was stirred at 120° C. for about 15 minutes to obtain modified resin solution No. 1 having a resin solid content of 80%. The number average molecular weight (see note 1) of modified resin No. 1 was 1,300.

manufacture example 2～4

[0077] Production examples 2 to 4 Production examples of modified resin solutions No. 2 to No. 4 (for examples)

[0078] Except having set the compounding content of Table 1, it carried out similarly to manufacture example 1, and modified resin solution No. 2 - No. 4 were obtained.

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Abstract

The present invention relates to a coating composition that can form a coating film with excellent oxygen barrier properties. An object of the invention is to provide a coated article having excellent corrosion resistance using the coating composition. The present invention provides a coating composition comprising: a modified epoxy resin (A) containing a benzene diether structure represented by a specific formula (1), which is obtained by reacting diglycidyl ether (a1) with at least one phenol (a2) selected from resorcinol, hydroquinone, and catechol; and a crosslinking agent (B).

Description

technical field [0001] The present invention relates to a coating composition capable of forming a coating film excellent in oxygen permeation preventing ability, and to a coated article using the coating composition excellent in corrosion resistance. Background technique [0002] Among coating compositions, cationic electrophoretic coatings are widely used as primers for conductive metal products such as automobile bodies, which require these properties due to their excellent coating workability and good corrosion resistance of the formed coating film. [0003] Recently, from the consideration of improving the collision safety of the automobile body, a structure in which reinforcing members are overlapped is often used in bag-like structural parts, etc. In such parts, it is difficult to form electrophoretic coating due to the decrease in current density during electrophoretic coating. Therefore, it becomes a thin film or is not painted. In addition, since corrosion-generate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/44C09D5/08B32B33/00
CPCC08G18/755C08G18/7642C08G18/0814C09D175/04C08G59/1444C08G2150/90C08G18/8077C08G18/643
Inventor 广濑有志
Owner KANSAI PAINT CO LTD
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