A solvent-free phenolic epoxy coating

Abstract

The invention discloses a solvent-free phenolic epoxy coating, which comprises A component and B component. In parts by weight, the A component is: phenolic epoxy resin 30% to 50%, bisphenol A epoxy resin E51 15%~30%, filler 30%~45%, auxiliary agent 1~2%; the B component is: alicyclic amine curing agent 60%~70%, reactive modifier 10%~20%, Inactive plasticizer 10%-20%, catalyst 5%-10%; by mass ratio A component: B component = 100: (18-25). The invention uses glycidyl tertiary carbonate as modifier to modify the alicyclic amine curing agent. Due to the steric hindrance effect of glycidyl tertiary carbonate, the penetration of polar solvents and chemical substances into the paint film is reduced, and the paint has More excellent chemical resistance can ensure long-life use of the inner wall of chemical fiber acid and alkali storage tanks. The coating can be sprayed mechanically or applied by hand, which overcomes the shortcomings of complex rubber-lined vulcanization technology in the past.

Description

technical field [0001] The invention relates to the field of coatings, and more particularly, to a solvent-free phenolic epoxy coating used for anticorrosion in chemical fiber acid-base storage tanks. Background technique [0002] In the chemical fiber industry, the storage and conveying systems of viscose, alkali and process water and the degassing tank are all strong alkali and strong acid media. At present, rubber anticorrosive linings are mostly used for internal anticorrosion. Rubber anti-corrosion lining is to use natural rubber, neoprene rubber and butyl rubber as anti-corrosion materials on the working surface of metal or other materials, and to form a continuous insulating covering layer through a series of processes. This technology is widely used in acid-base tanks and pipelines in chemical fiber plants. The specific construction process includes formulating glue, painting glue, pasting glue board and vulcanizing. The vulcanization process can make the rubber co...

AI Technical Summary

Problems solved by technology

Therefore, the rubber lining equipment must strictly control the vulcanization conditions. In order to obtain the best quality of the rubber lining layer, the vulcanization conditions must take into account factors such as the type of rubber material, the working wall thickness, the lining method, the vulcanization method, and the site conditions. The entire vulcanization process has The process is complicated, the efficiency is low, and the pass rate is low

[0004] In addition, when there is a problem with the lining during use, it is difficult to repair it, and it is also difficult to vulcanize the repaired place.

The vulcanization of the repaired part can only be partially baked and vulcanized. In actual operation, it is difficult to control the vulcanization temperature and vulcanization time. If the vulcanization temperature is too low or the vulcanization time is too short, the rubber sheet will be undersulfurized; If the vulcanization time is too long, the rubber sheet will be overvulcanized, or even scorched, both of which will greatly reduce the corrosion resistance, aging resistance and leakage resistance of the lining layer

In addition, various solvents are used in the preparation of glue, which not only endangers the health of workers, but also does not comply with the national energy conservation and environmental protection policy

[0005] Chinese patent application CN 109423167 A discloses a solvent-free phenolic epoxy coating, including phenolic epoxy resin, epoxy reactive diluent, curing agent, adhesion promoter, epoxy accelerator, pigments and fillers, auxiliary agents and solvents, The paint formula still contains a small amount of solvent (4%-12%), which does not meet the increasingly stringent environmental protection requirements of the country

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