Preparation method for environment-friendly nano-plating solution for tin plate and using method thereof

Abstract

The invention discloses a preparation method for an environment-friendly nano-plating solution for a tin plate and a using method thereof, and belong to the field of food packaging. The preparation method comprises the following steps of first, adding gamma-aminopropyltriethoxysilane into desalted water to react slowly; then, adding gamma-(2,3-glycidoxypropyl)trimethoxysilane, and continuing stirring and reacting; next, slowly adding fluotitanic acid and hexafluorozirconic acid in sequence slowly, and stirring and reacting; and finally, adding ammonium dihydrogen phosphate, zinc dihydrogen phosphate and manganous nitrate in sequence, slowly stirring to completely dissolve the ammonium dihydrogen phosphate, the zinc dihydrogen phosphate and the manganous nitrate to obtain the transparent environment-friendly nano-plating solution. The using method comprises the following steps of first, diluting the plating solution to form a working solution by adopting the desalted water; then, spraying to obtain a continuous uniform liquid film; and finally, heating and curing to obtain a plating film. The plating solution can form a nano-plating film on the surface of the tin plate, has excellent binding force with a polymer coating is excellent, meanwhile, has resistance to corrosion, resistance to sulfur, resistance to acid and resistance to yellowing and has excellent welding performance,and meets the requirement on the application performance of the tin plate.

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.