Method for producing watersoluble floating coat paint suitable for original factory of vehicle and repair

Abstract

The invention provides the preparation method of a water intermediate coating suitable for automobile factories and repair. The coating prepared by the method is universally suitable for automobile factories and repair. The preparation method comprises the following steps and process conditions: (1) synthesizing water-dispersible resin; (2) modifying hydrophilic polyisocyanate; (3) preparing the intermediate coating for automobile factories and repair; and (4) mixing the intermediate coating prepared in step (3) with the hydrophilic end-terminated polyisocyanate synthesized in step (2) to obtain the final product. The prepared intermediate coating has high applicability and is suitable for factory manufacturing and for repair. The intermediate coating is very friendly to the environment and greatly reduces the use of and the dependence on organic solvent, thus effectively conserving the energy resources. Additionally, the coating has the advantages of excellent flexibility, particularly high chip resistance and water resistance, smooth and fine coating surface and excellent interlayer adhesive force with the prime coat and the top coat.

Description

【Technical field】

[0001] The invention relates to a method for preparing a coating, in particular to a method for preparing a water-based intermediate coating suitable for both original and repaired automobiles. 【Background technique】

[0002] The middle coating is also called the intermediate coating, which is the coating between the primer and the topcoat, and the coating used is called the middle coating. The main function of the middle coating is to fill and cover the defects such as blisters, sand marks, pinholes, and pitting on the surface of the putty and paint film, to further improve the vividness and fullness of the topcoat coating, improve the decorativeness, and increase the coating quality. Thickness for improved water resistance. At present, solvent-based polyester is widely used in the coatings used in automobiles, and its organic solvent content is high, about 50%, which does not meet the requirements of environmental protection regulations, while water-base...