Double-component aqueous epoxy coating

Abstract

The invention relates to a two-component water-based epoxy coating, component A: 30-50% of amine-terminated water-based amine-epoxy adduct; 20-40% of pigment; 0-15% of filler; flash corrosion inhibitor 0 ~1%; defoamer 0.1~1%; wetting and dispersing agent 0.1~1%; deionized water 15~30%; cosolvent 1~8%; component B: diglycidyl ether of bisphenol A 70~ 85%; amine-terminated water-based amine-epoxy adduct 5-12%; polyphenol 5-10%; catalyst 0.01-1%; component A and component B are mixed in a weight ratio of 2.0-3.33:1 before use The above-mentioned amine-terminated water-based amine-epoxy adduct is composed of olefin-based polyamine 15-20%, polyepoxy compound 5-12%; bisphenol A diglycidyl ether 2-30%, acetic acid 1-8% , 15-20% of co-solvent and 20-30% of deionized water are prepared by stepwise polymerization.

Description

technical field [0001] The invention relates to a two-component waterborne epoxy paint, which is especially suitable for the concrete surface and steel structure of nuclear power plants. Background technique [0002] At present, the coatings used on the concrete surface and steel structure surface of domestic nuclear power plants are all solvent-based. Due to growing concerns about the adverse effects of organic solvents on the environment and human health, many industries, including the paint and coatings industry, are required to reduce the volatile organic compound (VOC) content of their products. There are many methods of VOC reduction in the coatings industry, but undoubtedly the most important method is the use of water-based (WB) coatings, in which water is used in whole or in part instead of the viscosity previously used to reduce the viscosity of paint formulations to the extent necessary for coating. of organic solvents. Of course, since water is not a solvent fo...

AI Technical Summary

Problems solved by technology

The above-mentioned self-dispersing and curing epoxy resin must be dispersed in specially designed high-shear equipment, and in order to ensure the stability of the dispersion, it must be produced according to a specific reaction sequence, the production process is more complicated, and the product stability is not good. Too ideal; US Patent 4246148 describes a water-soluble amine-epoxy adduct prepared by reacting an epoxy resin with a polyamine and a capping agent containing a saturated Monoglycidyl ether of linear aliphatic monohydric alcohol mixture, which has 8 to 10 carbon atoms, also introduces an emulsifiable epoxy resin composition, which is prepared by an epoxy resin and a 40% non- An aqueous solution of ionic surfactant emulsifies it into an epoxy emulsion and is used as one component of a two-component coating, and uses the above-mentioned amine-epoxy adduct as another component to form a two-component environmentally friendly industrial anti-corrosion coating

Although this kind of coating has low VOC, good chemical corrosion resistance and mechanical properties, it still needs to be emulsified with surfactants, and has poor nuclear radiation resistance and poor denuclear pollution.