Phosphate/polyurethane modified waterborne alkyd anticorrosive coating

Abstract

The invention relates to a phosphate / polyurethane modified waterborne alkyd anticorrosive coating. The coating is composed of phosphate / polyurethane modified waterborne alkyd resin, a cosolvent, a filler, an antirust pigment, an auxiliary agent and deionized water, wherein the phosphate / polyurethane modified waterborne alkyd resin is prepared by performing a reaction on vegetable oil fatty acid, isophthalic acid, an organic acid anhydride, a diol, a branched-chain polyol, dimethylolpropionic acid, alkyl acrylate phosphate, polyisocyanate and a neutralizer. The phosphate / polyurethane modified waterborne alkyd anticorrosive coating provided by the invention has a phosphate group and a metal substrate, forms a compact phosphating film, thereby improving water resistance and rust resistance ofa coating film; and the coating is combined with the characteristics of polyurethane chemical resistance, aging resistance, flexibility and wear resistance, and the prepared phosphate / polyurethane modified waterborne alkyd anticorrosive coating has excellent adhesion, water resistance, flash rust resistance, chemical resistance, aging resistance, corrosion resistance and salt spray resistance.

Description

technical field [0001] The invention relates to a modified alkyd resin water-based anti-corrosion primer, and further relates to a phosphoric ester / polyurethane modified water-based alkyd anti-corrosion coating, which belongs to the technical field of water-based anti-corrosion coatings. Background technique [0002] Coating is an indispensable material for national production and various economic sectors. It is widely used in the decoration of buildings and industrial products, as well as the anti-corrosion coating protection of various hardware and vehicles. It has the advantages of good film adhesion, brightness, plumpness, good wetting performance to pigments, and good workability. It has always occupied a considerable proportion in the field of traditional coatings. [0003] Every year in China, a large number of metals are damaged due to corrosion and lose their original performance, resulting in a large number of scrapped metals and huge economic losses. People have s...

AI Technical Summary

Problems solved by technology

[0005] When the existing hydroxyacrylate emulsion is used in water-based anti-corrosion coatings, the water resistance and salt spray resistance of the paint film still cannot meet the requirements of anti-corrosion, which delays the water-based process of coatings. Phosphate is an important surface As an active agent, the phosphate group can form a dense phosphate protective film with the substrate metal, passivate the surface of the substrate, prevent water molecules and other salts from contacting the metal, and make the coating antirust