Pollution-free aqueous antirust coating

Abstract

The invention discloses a pollution-free aqueous antirust coating, which is characterized by comprising components A and B, wherein the component A comprises a bisphenol A / F epoxy emulsion, Mg-Zn borophosphate, titanium dioxide, barium sulfate, talcum powder, mica and distilled water; and the component B is an aqueous epoxy curing agent. With the adoption of the technical scheme, the aqueous coating which has the advantages of low VOC (Volatile Organic Compounds) content, low toxicity and anti-corrosion function is obtained.

Description

technical field [0001] The invention relates to an antirust paint, in particular to a pollution-free water-based antirust paint. Background technique [0002] Paint protection is a widely used rust prevention method. Most of the antirust paints used in traditional paints are pigments containing chromium, lead, and cadmium, such as red lead, lead powder, and chromates of zinc, barium, and lead. The paint prepared from these pigments has good anti-rust property and is an effective anti-rust material. However, these additives are toxic in themselves, and the volatile organic compounds (VOC) released into the air during the manufacturing, construction, drying, curing and film-forming process of common organic solvent-based coatings are one of the serious environmental pollutants, which are harmful to the human body. Health and environment pose serious pollution and threats. [0003] Since water-based coatings have the advantages of low VOC content, no odor, non-combustibility...

AI Technical Summary

Problems solved by technology

Zinc phosphate is the most important component of non-toxic anti-rust pigments. Its anti-rust ability has been affirmed by coatings. However, due to the large particles of ordinary zinc phosphate, its shape is brick-shaped, the specific area is small, and the dispersion is poor. , and the solubility is low and the hydrolysis is poor, the antirust activity is insufficient, the speed of forming an effective protective film is too slow, the antirust performance cannot reach the level of the traditional zinc chrome yellow, and it is difficult to fully replace the traditional toxic antirust pigments

Based on this reason, researchers at home and abroad have carried out relevant improvement work on ordinary zinc phosphate. A water-based epoxy anti-corrosion coating and its preparation method disclosed in January 2012 (patent number: 201010218591.1) uses composite zinc phosphate, three Aluminum polyphosphate and iron-titanium powder replace ordinary zinc phosphate as antirust agent, but after the antirust agent is added to the emulsion, after the composite zinc phosphate and aluminum tripolyphosphate are hydrolyzed, a large amount of , make the pH value of the solution acidic, and the steel material begins to passivate when the pH value is 7, so the acidic solution will not be conducive to the substrate The passivation of the paint can not achieve the ideal anti-rust effect