Silane finishing agent at surface of galvanized steel sheet and preparation method thereof

Abstract

The invention discloses a silane finishing agent at the surface of a galvanized steel sheet and a preparation method thereof. Mixed solution is prepared from the following components of a silane coupling agent KH550, film-forming resin, benzoic acid monoethanolamine, propylene glycol, triethanolamine, carboxyl methyl cellulose, polyvinyl alcohol, oxalic acid, polydimethylsiloxane, hydroquinone sodium bicarbonate and ethanol. The silane coupling agent KH550 is adopted as a primary material; and the ethanol is taken as a solvent, so that the silane finishing agent is low in cost; the benzoic acid monoethanolamine and different auxiliary agents are added to the material at the same time; and the processing time and the processing temperature of the finishing agent are improved. A work-piece is processed by the silane finishing agent disclosed by the invention; a polyacid film is formed at the surface; and the film has the characteristics of being strong in adhesive force, free of a cavity, compact and even in chasm, small in polarization current density, environment-friendly in the production process and free of pollution.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a silane treatment agent for the surface of galvanized steel sheets and a preparation method thereof. Background technique [0002] In the field of metal surface treatment, although traditional phosphate conversion and chromate passivation surface treatment technologies can achieve good results, the waste liquid discharged during the treatment process contains heavy metal ions such as zinc, manganese, nickel, chromium and nitrous acid. Carcinogens such as salt are very serious to environmental pollution, and metal surface silanization treatment technology is considered to be expected to replace phosphate conversion treatment and chromate passivation treatment because it does not involve substances that are harmful to the environment, the production process has low energy consumption, and the technology has a wide range of applications. Chemical treatment is the latest dev...

AI Technical Summary

Problems solved by technology

[0002] In the field of metal surface treatment, although traditional phosphate conversion and chromate passivation surface treatment technologies can achieve good results, the waste liquid discharged during the treatment process Contains heavy metal ions such as zinc, manganese, nickel, chromium and carcinogens such as nitrite, which is very serious to environmental pollution, and the metal surface silanization treatment technology does not involve substances that are harmful to the environment, the production process has low energy consumption, and the technical application field Widely used, it is considered to be expected to replace phosphate conversion treatment and chromate passivation treatment. It is the latest development direction of metal surface protection alone. In the existing technology, the film formed on the surface of metal workpieces treated with silane solution has uneven density and Holes, cracks, and weak support to the metal body