A kind of preparation method and application method of environment-friendly nano-plating solution for tinplate

Abstract

A preparation method and application method of an environment-friendly nano-plating solution for tinplate, belonging to the field of food packaging, the preparation method adopts gamma-aminopropyltriethoxysilane to add desalted water to react slowly; then add gamma-(2, 3‑glycidoxy)propyltrimethoxysilane continued to stir and react; then slowly added fluorotitanic acid and fluorozirconic acid successively, and stirred and reacted; finally, added ammonium dihydrogen phosphate, zinc dihydrogen phosphate, and manganese nitrate successively, and stirred slowly It is completely dissolved to obtain a transparent environment-friendly nano-plating solution. The method of use uses desalted water to dilute the plating solution to form a working solution, then sprays to obtain a continuous and uniform liquid film, and finally heats and solidifies to obtain a coating film. The plating solution can form a nano-scale coating on the surface of the tinplate, has excellent binding force with the polymer coating, and has corrosion resistance, sulfur resistance, acid resistance, yellowing resistance, and excellent welding performance, which meets the application performance requirements of the tinplate.

Description

technical field [0001] The invention belongs to the field of food packaging, and in particular relates to a preparation method and an application method of an environment-friendly nano-plating solution for tinplate. Background technique [0002] Cold-rolled tinplate is the main raw material for making food cans and beverage cans. During the production process of tinplate, it is necessary to carry out chromate cathodic electrolytic passivation on the tinplate. In the prior art, patent CN1416478A proposes a chemical solution containing phosphate ion tin ion and epoxy silane coupling agent, which can obtain excellent coating adhesion, corrosion resistance and processability through dipping or electrolytic treatment; patent CN101104932A proposes A passivation solution composed of trisodium phosphate, cobalt sulfate, and water; patent CN101358350A proposes a passivation solution composed of trisodium phosphate, cobalt chloride, and water; The passivation solution composed of , p...

AI Technical Summary

Problems solved by technology

[0003] Although there are various methods for chromate cathodic electrolytic passivation of tinplate in the prior art, Cr in chromate 6+ Due to the particularity and diversity of tinplate application fields, the research on alternative films is also very difficult, and the research results at home and abroad have also been in the process of exploration and evaluation.