Acid-proof cathode electrophoretic paint as well as preparation method and application method

Abstract

The invention discloses an acid-proof cathode electrophoretic paint as well as a preparation method and an application method. The electrophoretic paint comprises emulsion and color paste, wherein the emulsion is prepared by steps of mixing amine modified epoxy resin, a totally-closed isocyanate cross-linking agent and an emulsifying agent, uniformly stirring at the temperature of 43 DEG C to 47 DEG C, adding formic acid at the temperature of 45 DEG C to 49 DEG C to perform an acidification reaction for more than 70 minutes, subsequently adding deionized water, uniformly stirring and then filtering. The color paste is prepared by the steps of mixing quaternary ammonium dispersion resin, deionized water, dibutyl tin oxide, kaolin, carbon black, an emulsifying agent, rutile titanium dioxide and titanium-based nanometer paste, uniformly stirring at the temperature not higher than 30 DEG C, grinding the mixture at the temperature not higher than 35 DEG C by use of a grinder until the fineness is not larger than 15 microns, uniformly stirring and filtering. An application process comprises batching, preparation of a tank and an electrophoretic coating process; the preparation of the tank comprises steps of mixing 10-15 parts by weight of the color paste, 35-40 parts by weight of the emulsion and 50-75 parts by weight of the deionized water, and curing for 48-50 hours at the temperature of 28-30 DEG C; and the electrophoretic coating process comprises a step of performing electrophoresis to a to-be-coated element for 3-4 minutes under the voltage of 200V.

Description

technical field [0001] The invention relates to the technical field of cathodic electrophoretic paint, in particular to an acid-resistant cathodic electrophoretic paint, a preparation method and an application method. Background technique [0002] Cathodic electrophoretic coatings are widely used, and the proportion is mainly epoxy resin as the main film-forming substance, which has good corrosion resistance. [0003] However, the cathodic electrophoretic coatings of the prior art have the following deficiencies: since epoxy resins are generally modified with amines in the water-based process, the acid resistance of the coating film is insufficient. my country's current cathodic electrophoretic coatings standard HG / T 3952- In 2007, the regulations on acid resistance are only 24 hours soaked in 5% sulfuric acid solution without abnormalities. If soaked for 2-3 days, blistering and peeling of the coating film will occur, which is far from meeting the anti-corrosion performance ...

AI Technical Summary

Problems solved by technology

[0003] However, the cathodic electrophoretic coatings of the prior art have the following deficiencies: since epoxy resins are generally modified with amines in the water-based process, the acid resistance of the coating film is insufficient. my country's current cathodic electrophoretic coatings standard HG / T 3952- In 2007, the regulations on acid resistance are only 24 hours soaked in 5% sulfuric acid solution without any abnormalities. If soaked for 2-3 days, blistering and peeling of the coating film will occur, which is far from meeting the anti-corrosion performance requirements of petroleum pipelines and other industries.