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Cationic electrodeposition coating composition

一种阳离子电沉积、组合物的技术，应用在环氧树脂涂料、涂层、薄料处理等方向，能够解决不能提供抗腐蚀性精加工性等问题，达到改善电沉积涂装适用性和精加工性、优异抗腐蚀性和精加工性、高粘合性质的效果

Active Publication Date: 2010-12-01
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above findings cannot provide an electrodeposited coating film having excellent corrosion resistance and satisfactory finish, particularly satisfactory finish at a dry film thickness of 15 μm

Method used

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  • Cationic electrodeposition coating composition
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  • Cationic electrodeposition coating composition

Examples

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Embodiment

[0131] 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. "Parts" in each example means parts by mass and "%" means % by mass.

[0132] Preparation of Amino-Containing Modified Epoxy Resin (A)

preparation Embodiment 1

[0133] Preparation Example 1: Preparation Example of Base Resin No.1

[0134] In a 2-liter flask equipped with a thermometer, reflux condenser and stirrer, add 185 parts of Denacol EX-821 (Note 1), 950 parts of jER828EL (Note 5), 456 parts of bisphenol A and 0.8 parts of Tetra Butyl ammonium bromide. The mixture was reacted at 160° C. until the epoxy equivalent became 800.

[0135] Subsequently, 359 parts of methyl isobutyl ketone, and 150 parts of diethanolamine, and 127 parts of diethylenetriamine and methyl isobutyl ketone imide (purity 84%, methyl isobutyl ketone solution), and then allowed to react at 120° C. for 4 hours. A solution of base resin No. 1, which is an amino group-containing modified epoxy resin with a resin solid content of 80%, was thus obtained. Base resin No. 1 had an amine value of 69 mg KOH / g, and a number average molecular weight of 2,400.

preparation Embodiment 2

[0136] Preparation Example 2: Preparation Example of Base Resin No.2

[0137] In a 2-liter flask equipped with a thermometer, reflux condenser and stirrer, add 471 parts of Denacol EX-931 (Note 2), 950 parts of jER828 EL (Note 5), 456 parts of bisphenol A and 0.8 parts of Tetrabutylammonium bromide. The mixture was reacted at 160° C. until the epoxy equivalent became 950.

[0138] Subsequently, 430 parts of methyl isobutyl ketone, and 150 parts of diethanolamine, and 127 parts of diethylenetriamine and methyl isobutyl ketone imide (purity 84%, methyl isobutyl ketone solution), and then allowed to react at 120° C. for 4 hours. A solution of base resin No. 2, which is an amino group-containing modified epoxy resin with a resin solid content of 80%, was thus obtained. Base resin No. 2 had an amine value of 60 mg KOH / g, and a number average molecular weight of 2,500.

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Abstract

An object of the present invention is to provide a coating composition that has excellent electrodeposition coating applicability onto hot dip galvanized steel sheets, and that provides a cationic electrodeposition coating film having a superior finish and excellent anti-corrosion properties. The present invention provides a cationic electrodeposition coating composition having: amino group-containing modified epoxy resin (A), phenolic hydroxy group-containing resin (B), and blocked polyisocyanate curing agent (C), the components (A), (B), and (C) being contained in amounts of 5 to 50 mass %,20 to 75 mass %, and 10 to 40 mass %, respectively, based on the total solids mass of the components (A), (B), and (C).

Description

technical field [0001] The present invention relates to a cation having excellent applicability for electrodeposition coating on hot-dip galvanized steel sheets and capable of providing excellent corrosion resistance and finishing properties, especially excellent finishing properties at a dry film thickness of 15 μm A cationic electrodeposition coating composition for an electrodeposition coating film. Background technique [0002] Due to their excellent painting workability and good corrosion resistance of the resulting coating film, cationic electrodeposition coating compositions are widely used as primer compositions for conductive metal products such as automobile bodies requiring the above properties. In electrodeposition coating using a cationic electrodeposition coating composition, it is attempted to maintain the inner plate film thickness of pockets and gaps, etc. to ensure corrosion resistance, and to achieve optimization and uniformity of the outer plate film thic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D163/02
CPCC08G2650/56C08L71/00C09D5/4434C09D163/00C08G59/184C09D5/4473Y10T428/31529C08L2666/22
Inventor 西口滋朗嵨崎昭彦
Owner KANSAI PAINT CO LTD
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