Preparation method of pretreating agent used for coating vehicle frames

Abstract

The invention relates to the technical field of automobile part processing and in particular relates to a preparation method of a pretreating agent used for coating vehicle frames. The preparation method is characterized by firstly adding 25 parts of polyurethane and 30 parts of water to a container and stirring the materials for five minutes; then slowly adding 5 parts of nitric acid, stirring the materials while adding and stirring the materials for five minutes after completing adding; then slowly adding 15 parts of polyvinyl acetate emulsion and 20 parts of water, stirring the materials while adding and stirring the materials for five minutes after completing adding; then slowly adding 0.3 part of coumarin glycoside, stirring the materials while adding and stirring the materials for five minutes after completing adding; finally slowly adding 0.5 part of sodium chloride and 30 parts of water and stirring the materials for ten minutes. The preparation method of the pretreating agent has the beneficial effects that by adopting the gradually adding method, not only can the dissolving properties among various substances be improved but also the possibility of particle aggregation can be avoided, so that the pretreating capacity of the pretreating agent is remarkably improved and the follow-up treating steps are more favourable.

Description

technical field [0001] The invention relates to the technical field of auto parts processing, in particular to a preparation method of a pretreatment agent used for vehicle frame coating. Background technique [0002] In order to better improve the structural performance of the frame and prolong its service life, it is first coated with polytetrafluoroethylene nano film on its surface, and then coated with color paint. This processing method only coats the film on the surface without using a protective film substrate. After the coated product is used for a period of time, the film on the surface gradually fades away, which will have a certain impact on the structural performance of the frame. impact, but also have adverse consequences on the quality of the product. Contents of the invention [0003] For the technical problems existing in the prior art, the purpose of the present invention is to provide a kind of preparation method for the pretreatment agent of vehicle fra...

AI Technical Summary

Problems solved by technology

This processing method only coats the film on the surface without using a protective film substrate. After the coated product is used for a period of time, the film on the surface gradually fades away, which will have a certain impact on the structural performance of the frame. impact, but also have adverse consequences on the quality of the product