Water-based amino baking varnish for galvanized sheets and preparation method thereof

Abstract

The invention provides water-based amino baking varnish for galvanized sheets and a preparation method thereof. The water-based amino baking varnish is prepared from the following raw materials in parts by weight: 20-35 parts of an aqueous polyester resin, 4 to 8 parts of a water-based amino resin; 5-10 parts of titanium dioxide, 1-3 parts of carbon black, 10-15 parts of barium sulfate, 3 to 5 parts of epoxy modified wollastonite; 0.1 to 0.3 part of bentonite, 0.5 to 1 part of fumed silica, 8 to 15 parts of an alcohol ether auxiliary agent, 1 to 2 parts of a dispersant, 0.5 to 0.8 part of an antifoaming agent, 0.3 to 0.5 part of a wetting agent, 0.3 to 0.5 part of a leveling agent, 1 to 1.5 parts of an amine neutralizer, 0.3 to 0.8 part of an anti-sagging auxiliary agent, 0.5 to 1 part ofan adhesion promoter and 30 to 50 parts of deionized water. The baking varnish has the advantage of high adhesive force on galvanized plates, and can effectively improve the corrosion resistance of the galvanized plates.

Description

technical field [0001] The invention relates to the field of water-based coatings, in particular to a water-based amino baking varnish for galvanized sheets and a preparation method thereof. Background technique [0002] Water-based coatings are non-toxic, non-combustible, use water as a solvent, save a lot of energy, eliminate the risk of fire during construction; reduce air pollution; only use a small amount of low-toxicity alcohol ether organic solvents, improve the working environment conditions, The VOC content is much lower than that of solvent-based coatings, and the physical and chemical properties of the paint film are as good as or better than those of solvent-based coatings, so it is favored by people. [0003] The existing coatings, whether they are primers or topcoats, are based on non-toxic and non-polluting basic requirements for research and development. On the basis of achieving environmental protection, economy and high performance, it is important to impro...

AI Technical Summary

Problems solved by technology

The fatty acid substances contained in the coatings of the prior art are easy to undergo saponification reaction with zinc to form zinc soap, which destroys the zinc layer on the surface of the steel plate. On the one hand, it affects the anti-corrosion performance of the zinc layer on the steel plate. Smooth, which is not conducive to the adhesion of the existing paint film, and the raw materials in the existing paint are easy to react with zinc, and the resulting basic double salt is easily soluble in water, which will lead to poor adhesion of the primer and easy peeling off of the paint layer

Generally speaking, the existing water-based coatings for galvanized sheets are still immature, and it is difficult to meet some occasions with relatively high performance requirements. Therefore, it is particularly important to develop corresponding water-based coating products