Low-water-absorption anticorrosive coating epoxy resin matrix and preparation method thereof

Abstract

The invention discloses a low-water-absorption anticorrosive coating epoxy resin matrix and a preparation method thereof. According to the scheme, polysulfide rubber and epoxy resin are subjected to cross-linking reaction under the catalysis of triphenylphosphine, compared with common blending compatibility, the compatibility is better, the advantages of the polysulfide rubber and the epoxy resin for enhancing a polymer matrix are effectively integrated, the disadvantages of the polysulfide rubber and the epoxy resin are made up, and the problem of water absorption caused by poor compatibility of a traditional polysulfide rubber / epoxy resin matrix is solved; the water absorption rate of the matrix is greatly reduced, the mechanical property and the corrosion resistance are greatly improved, and the anticorrosive coating prepared from the matrix can be used in harsh corrosion environments such as ocean and the like.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion coatings, in particular to an epoxy resin matrix of an anti-corrosion coating with a low water absorption rate and a preparation method thereof. Background technique [0002] In high humidity or marine environments, metal protection requires heavy-duty anti-corrosion coatings. Typically, these heavy duty coatings require at least two properties. One is to have good barrier properties to water, and the other is to closely bond with the metal substrate. Only with sufficient adhesion can the substrate be protected more effectively, especially in humid conditions, water will make the substrate Adhesion between the material and the coating deteriorates. In addition, occasional scratches and abrasions on the coating are often unavoidable, and tight adhesion can prevent or delay the coating from peeling off the metal surface. [0003] The first thing to prepare a coating is to determine the sub...

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Problems solved by technology

[0003] The first thing to prepare a coating is to determine the substrate. The epoxy resin has low shrinkage, excellent permeability resistance, and stable performance of the cured product, which has established its important position in the field of heavy-duty anti-corrosion coatings. The adhesion of the material to the metal, the liquid polysulfide rubber can be reacted with the epoxy resin to introduce the thioether bond in the skeleton into the epoxy resin through a block copolymerization reaction, so that the chain segment has better mobility, so the modified The flexibility of the entire molecular chain of epoxy resin is improved, thereby improving the adhesion to the substrate metal, and the anti-corrosion coating should still have excellent anticorrosion ability in harsh environments, in addition to having good adhesion to the substrate metal In addition, there are also high requirements for the water resistance of the substrate, but in actual production, it is found that the water absorption rate of the polysulfide / epoxy system is still high, which cannot meet the requirements of heavy anti-corrosion

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