Medium-temperature degreasing agent for automobile coating surface conditioning pretreatment and degreasing method thereof

Abstract

The invention discloses a medium-temperature degreasing agent for pre-treatment of automobile painting surface adjustment and a degreasing method thereof. The medium-temperature degreasing agent is prepared by mixing the following components in weight percent: 30-50% of strong alkali, 30-50% of soluble phosphate 50%, complexing agent 10-20%, surfactant 2-6% and stabilizer 2-10%. The degreasing method is to heat the desalted water working solution to 40-55° C., add different percentages of the normal temperature degreasing agent, and degrease the automobile steel plate through three processes of spraying, soaking and water washing. The invention has excellent cleaning performance, can adapt to a faster automobile coating production line, and effectively solves the problem of unclean cleaning of the steel plate surface.

Description

technical field [0001] The invention relates to a medium-temperature degreasing agent, in particular to a medium-temperature degreasing agent and a degreasing method for the pre-conditioning treatment of the surface of an automobile coating. Background technique [0002] The chemical degreasing process is an important pre-treatment link in the automobile painting process. It mainly uses lye to saponify, emulsify and dissolve the oil to remove the oil on the surface of the workpiece. The surface chemical cleaning treatment process must be carried out before surface adjustment to remove oil particles and other surface residues on the metal surface. If the oil removal is not clean during the pre-treatment, the oil will be brought into the subsequent process, which will affect the product quality. The treatment effect is good or bad. It is the key to ensure the quality of the paint film. [0003] The chemical degreasing process generally adopts the combination of spraying and i...

AI Technical Summary

Problems solved by technology

[0004] Traditional degreasing agents mainly include the following categories: 1) Organic solvents, such as gasoline, freon, trichloroethane, toluene, ethanol, etc., organic solvents have a good cleaning effect on soluble oil stains, but it is difficult to remove inorganic particles, metal particles, etc. And general volatility is strong, poisonous and harmful, be unfavorable for on-the-spot operation environment; May cause metal surface corrosion; 3) emulsion, can remove all kinds of oil stains on the metal surface, and has good cleaning effect, but generally has poor stability and cannot be stored for a long time. cost

[0005] In addition, the coating production line is a continuous production line with fast production speed. Different coating production lines have different cleaning temperatures.

With the existing degreasing agent, the saponification and emulsification ability is not strong under medium temperature cleaning at 40-55 °C, which often leads to poor cleaning on the surface of the steel plate, which affects the product quality

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