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Cationic electrodeposition coating composition

A cationic electrodeposition and composition technology, which is applied in electrophoretic coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve the problems of difficult coating composition stability, throwing ability and corrosion resistance, and achieve excellent Stability, less blocking effect

Active Publication Date: 2016-12-14
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, for cationic electrodeposition coating compositions of PTL1 and PTL2, it is difficult to satisfactorily achieve excellent coating composition stability, throwing ability and corrosion resistance

Method used

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  • Cationic electrodeposition coating composition
  • Cationic electrodeposition coating composition
  • Cationic electrodeposition coating composition

Examples

Experimental program
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Effect test

preparation example Construction

[0100] Preparation of Cationic Electrodeposition Coating Composition

[0101] The ratio of modified epoxy resin (A), amino group-containing epoxy resin (B) and blocked polyisocyanate curing agent (C) in the cationic electrodeposition coating composition of the present invention is: based on the components ( The total solid content of A), component (B) and component (C), the consumption of component (A) is 3 mass %-40 mass %, preferably 10 mass %-37 mass %, said component (B ) is used in an amount of 20% by mass to 60% by mass, preferably 28% by mass to 55% by mass, and component (C) is used in an amount of 10% by mass to 40% by mass, preferably 15% by mass to 35% by mass.

[0102] When the amount of the modified epoxy resin (A) is less than 3% by mass, corrosion resistance and exposure corrosion resistance may deteriorate. When the amount of the modified epoxy resin (A) is greater than 40% by mass, exposure corrosion resistance and composition stability may be deteriorated....

Embodiment

[0115] The present invention is explained in detail below with reference to Preparation Examples, Examples, and Comparative Examples; however, the present invention is not limited thereto. In the examples, "part" and "%" are based on mass.

[0116] Preparation of modified epoxy resin (A)

Synthetic example 1

[0118] Preparation of Modifier No. 1

[0119] 300 parts of ε-caprolactone was added to 400 parts of PP-400 (trade name of polypropylene glycol, molecular weight 400, manufactured by Sanyo Chemical Industry Co., Ltd.), and the mixture was heated to 130°C. Then, 0.01 part of tetrabutoxytitanium was added, and the mixture was heated to 170°C. While maintaining this temperature, samples were taken over time to monitor the amount of unreacted ε-caprolactone by infrared absorption spectroscopy. When the reaction rate reached above 98%, the resulting product was cooled to obtain No. 1 modifier.

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Abstract

The present invention addresses the problem of finding a cationic electrodeposition coating composition having good coating stability and also having excellent throwing power and anti-corrosive performance, particularly excellent anti-corrosive performance under severe conditions, and providing a coated article excellent in the aforementioned coating film properties. The present invention provides a cationic electrodeposition coating composition comprising a specific modified epoxy resin (A), an amino-group-containing epoxy resin (B) and a blocked polyisocyanate curing agent (C), wherein the modified epoxy resin (A), the amino-group-containing epoxy resin (B) and the blocked polyisocyanate curing agent (C) are contained in amounts of 3 to 40 mass%, 20 to 60 mass% and 10 to 40 mass%, respectively, relative to the total mass of the solid contents of the components (A), (B) and (C).

Description

field of invention [0001] Cross References to Related Applications [0002] This application claims priority from JP2012-220323A filed on October 2, 2012, the disclosure of which is hereby incorporated by reference in its entirety. The present application relates to a cationic electrodeposition coating composition having excellent stability and achieving excellent throwing ability and excellent corrosion resistance. Background technique [0003] The cationic electrodeposition coating composition has excellent coating processability and forms a coating film with satisfactory corrosion resistance. Accordingly, these coating compositions are widely used to form undercoats for conductive metal products such as automobile bodies that require the above-mentioned features. [0004] Hitherto, in order to improve crash safety, automobile bodies have been strengthened, and reinforcing materials have been further added to spot welded members. In this way, the object to be coated str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D5/44C09D175/04
CPCC09D175/04C08G18/0814C08G18/4081C08G18/643C08G18/8064C09D5/4438C09D5/4453C09D163/00
Inventor 饭岛英基伊藤圭
Owner KANSAI PAINT CO LTD