Preparation method of two-component automotive cathodic electrophoretic coating and preparation method thereof

Abstract

The invention relates to the field of coating, specifically to a preparation technology of a two-component automotive cathodic electrophoretic coating. The formula of the electrophoretic coating contains, by weight, 40-50 parts of modified epoxy resin A, 10-20 parts of modified epoxy resin B, 10-30 parts of a curing agent, 3-8 parts of single molecular amine, 0.1-2 parts of an emulsifier, 0.1-2 parts of a neutralizer and 30-50 parts of deionized water. The formula of the modified epoxy resin A contains, by weight, 10-20 parts of bisphenol A, 40-60 parts of epoxy resin, 8-16 parts of a solvent, 4-16 parts of a plasticizer and 10-35 parts of a flexible polymer. The formula of the modified epoxy resin B contains, by weight, 10-20 parts of bisphenol-F, 40-60 parts of epoxy resin, 5-10 parts of nonylphenol, 2-6 parts of xylene and 0.1-1 part of triphenyl phosphite. The formula of the curing agent contains, by weight, 20-66 parts of dimer fatty acid, 5-18 parts of vegetable oleic acid, 5-25 parts of fatty amine, 10-34 parts of ketone, 5-20 parts of ethers and 0.01-0.02 part of a terminating agent.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a preparation process of a two-component automotive cathode electrophoretic coating. Background technique [0002] Since the advent of cathodic electrophoretic coatings, because the formed paint film has excellent corrosion resistance, mechanical properties, and is suitable for automatic coating, it has quickly become popular in the automotive industry. The baking temperature range of traditional cathodic electrophoretic coatings is generally 170 ~180°C. At present, many industrial workpieces are made of rubber, plastic and other materials, which are required to be dried together with electrophoretic coating after processing, so as to reduce the operating intensity of workers and control costs. However, such materials are easily deformed or melted when baked under high temperature conditions. In order to meet the needs of this type of process, there are very few varieties of low-tempera...

AI Technical Summary

Problems solved by technology

Low-temperature curing cathodic electrophoretic coatings are not only beneficial to the coating of auto parts with plastic and rubber, but also can greatly reduce energy consumption. The organic lead and tin catalysts commonly used in cathodic electrophoretic coatings in the past have disadvantages such as high toxicity and environmental protection. Already restricted in Europe and developed countries

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