Chemical-resistant epoxy inner lining coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and particularly relates to a chemical-resistant epoxy inner lining coating and a preparation method thereof. The chemical-resistant epoxy inner lining coating provided by the invention is prepared from a component A and a component B, wherein the component A is prepared from the following components in parts by weight: 29 to 36 parts of bisphenol F epoxy resin, 0.4 to 0.6 part of a wetting dispersant, 0.3 to 0.5 part of an antifoaming agent, 0.4 to 0.6 part of a thixotropic agent, 10 to 18 parts of pigment, 30 to 32 parts of a filler a, 10 to 16 parts of a filler b and 6 to 10 parts of a mixed solvent; the component B is prepared from the following components in parts by weight: 70 to 75 parts of an aliphatic amine additive product, 22 to 27 parts of an organic solvent, 1.5 to 2 parts of a curing accelerator and 1 to 2 parts of an adhesion promoter; and the weight ratio of the component A to the component B is (3 to 4) to 1. The chemical-resistant epoxy inner lining coating provided by the invention is sufficiently cured in a normal-temperature condition, does not contain any active thinners or plasticizers, and has excellent chemical resistance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a chemical-resistant epoxy inner lining coating and a preparation method thereof. Background technique [0002] As we all know, cured epoxy resin has the characteristics of high adhesion, strong cohesion, small shrinkage, good electrical insulation, and excellent chemical resistance. Epoxy coatings developed with cured epoxy resin are widely used in anti-corrosion coatings Industrial fields, especially in the field of heavy anti-corrosion coatings. In practical applications, epoxy resins with different molecular weights can be selected as base materials according to the application field requirements of epoxy coatings, and different types of amine curing agents can also be selected. An important application of epoxy coatings is as an inner lining coating for storage tanks, containers, etc. [0003] Common epoxy lining coatings generally use novolac epoxy resin or liquid epoxy ...

AI Technical Summary

Problems solved by technology

However, there are two technical problems in the epoxy and novolac epoxy coating products currently used for inner linings: (1) whether the common epoxy and novolac epoxy inner lining coatings can be fully cured under normal temperature conditions, many The inner lining coating cannot be fully cured under normal temperature conditions, and the paint film can only be cured after baking or heated with a hot electrolyte during storage of thermochemical media. Under post-curing conditions, these inner lining coatings cannot be fully cured, and the chemical resistance of the paint film will be seriously affected, resulting in premature failure; (2) The improvement of common epoxy and novolac epoxy inner lining coatings Non-toxic aliphatic amines and alicyclic amine curing agents contain a large amount of active amine monomers and plasticizers. The existence of active amine monomers will cause the problem of amine salt and amine whitening in the paint film, which requires the coating to Environmental humidity and temperature must be strictly controlled in the process; at the same time, the highly volatile active amine monomer is highly irritating and has a serious impact on the health of the construction and coating personnel; in addition, the plasticizers in common epoxy and phenolic epoxy coatings The solvent will migrate or even be extracted by chemicals such as solvents in the corrosive medium, thereby affecting the chemical resistance of the paint film, and the addition of reactive diluents to epoxy and novolac epoxy coatings will also reduce the chemical resistance of the entire paint film

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