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Cationic coating composition

A cationic and composition technology, applied in the field of cationic coating composition, can solve the problems of incompatibility, not very effective performance, reduced corrosion resistance of coating film and the like

Inactive Publication Date: 2005-12-14
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem in that these materials not only do not have sufficiently high compatibility with epoxy resins and are not very effective in improving the properties of electrodepositable coatings for antirust steel sheets, but also when added in large amounts, the coatings The corrosion resistance of the film is reduced

Method used

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  • Cationic coating composition

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0087] Preparation Example 1: Preparation of Xylene-Formaldehyde Resin 1

[0088] In a separable flask with a capacity of 2 liters of thermometer, reflux condenser and stirrer, 240g of 50% formaldehyde solution, 55g of phenol, 101g of 98% industrial sulfuric acid and 212g of m-xylene were charged at 84 It was made to react at 88 degreeC for 4 hours. After the reaction was completed, the flask was left to stand to separate the resin phase from the sulfuric acid aqueous phase, and then the resin phase was washed with water three times and unreacted spacer was removed at 20 to 30 mmHg and 120 to 130° C. for 20 minutes. xylene to obtain 240 g of a phenol-modified xylene-formaldehyde resin with a viscosity of 1050 centipoise (25° C.).

preparation Embodiment 2

[0089] Preparation Example 2: Preparation of Xylene-Formaldehyde Resin 2

[0090] An o-cresol-modified xylene-formaldehyde resin was prepared in the same manner as in Preparation Example 1, except that 55 g of phenol was replaced with 55 g of o-cresol.

preparation Embodiment 3

[0091] Preparation Example 3: Preparation of Xylene-Formaldehyde Resin 3

[0092] A nonylphenol-modified xylene-formaldehyde resin was prepared in the same manner as in Preparation Example 1 except that 55 g of phenol was replaced with 55 g of nonylphenol.

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Abstract

The present invention provides a cationic coating composition capable of forming a coating film having excellent electrodepositable coating properties and adhesion properties to antirust steel sheets, corrosion resistance, and low-temperature curability. The cationic coating composition comprises as paint component xylene-formaldehyde resin-modified, amino-group-containing epoxy resin, and the xylene-formaldehyde resin-modified, amino-group-containing epoxy resin The resin is prepared by reacting an epoxy resin (A) having an epoxy equivalent of 180 to 2500 with a xylene-formaldehyde resin (B) and an amino group-containing compound (C).

Description

technical field [0001] The present invention relates to a cationic paint composition, and more particularly to a cationic paint composition capable of forming a cured paint film excellent in corrosion resistance and steel plate rust-proof performance. Background technique [0002] Cationic coating compositions are mainly used as electrodepositable coating compositions for a wide range of applications including undercoating compositions for automobile bodies, and have various features that have been developed so far. Proposed as a conventional cationic coating composition are, for example, coating compositions having excellent corrosion resistance and improved performance in electrodepositable coatings and improved adhesion properties to rust-proof steel sheets, wherein used as a carrier component is a modified A permanent epoxy resin prepared by internally plasticizing an epoxy resin having amino groups and / or quaternary ammonium salt groups as hydrophilic groups, using plas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/44C09D163/00
CPCC09D5/4434C09D5/4473C09D163/00Y10T428/31511C08L2666/16
Inventor 西口滋朗神门孝司御堂河内奖富永章崎昭彦饭岛英基
Owner KANSAI PAINT CO LTD
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