A solvent-free flexible anti-corrosion epoxy coating and its preparation method and application method

Abstract

The invention provides a solvent-free flexible anti-corrosion epoxy coating and a preparation method and application method thereof. In terms of mass percent, the epoxy coating includes 45 to 60 parts of epoxy resin, 10 to 15 parts of reactive diluent, 10 to 13 parts of aluminum tripolyphosphate, 7 to 10 parts of glass flakes, 2 to 3 parts of wetting Dispersion aid, 10-14 parts of filler; among them, the epoxy resin is composed of 30-40 parts of bisphenol A resin with an epoxy value of 0.54 and 15-20 parts of bisphenol A resin with an epoxy value of 0.42; reactive diluent It consists of 4-8 parts of polyethylene glycol diglycidyl ether and 6-7 parts of glycidyl methacrylate. Compared with the prior art, the epoxy coating of the present invention has the advantages of no solvent and zero VOC emission, and improves the durability and brittleness of the epoxy coating, prolongs the durability and anti-corrosion life of the coating, so it is a An environmentally friendly, flexible, long-term anti-corrosion epoxy coating.

Description

technical field [0001] The invention relates to the technical field of epoxy coatings with epoxy resin as the main film-forming substance, in particular to a solvent-free flexible anti-corrosion epoxy coating and its preparation method and use method, which are suitable for the surface of steel structures and other substrates, and have excellent flexibility. , can withstand large steel hoisting, deformation during installation, and does not contain organic solvents and fugitive small organic molecules, solvent-free epoxy anti-corrosion coatings with zero VOC emissions. Background technique [0002] Metal corrosion is a very serious problem faced by people. It is roughly estimated that the annual loss of metal structures, equipment and materials due to corrosion in my country is approximately equivalent to 20% to 40% of the metal output of the year, and more than 100 million tons of metals are scrapped due to corrosion every year in the world, accounting for 100% of economic ...

AI Technical Summary

Problems solved by technology

However, most of the existing epoxy coatings use organic solvents to dissolve epoxy resin, or use organic solvents as diluents, and the volume solid content of the coatings generally does not exceed 60%, so the emission of volatile organic compounds (VOC) is seriously polluting, which is harmful to the use of People cause serious health hazards and have been strictly restricted in developed countries

For example, the thickness of a single film does not exceed 50 microns, which makes it impossible to complete a single thick coating project and delays the construction progress. Therefore, multiple sprays are often used, but multiple sprays cannot normally guarantee the construction quality

Secondly, the flexibility of the coating above 100 microns obtained by using the existing epoxy coating cannot reach 2mm. After the coating is finished, the hoisting and installation of the rear section of the ring will often cause the coating to crack due to the thick coating and poor flexibility. ,crack

In addition, the existing epoxy coating has a relatively short anti-corrosion period. When used in combination with fluorocarbon and siloxane coatings, it cannot reach the anti-corrosion period of the external coating, resulting in the anti-corrosion period being limited by the internal epoxy coating.