A kind of anticorrosion coating and preparation method thereof

Abstract

The invention discloses anticorrosive paint and a preparation method thereof and belongs to the technical field of chemical paint processing. The anticorrosive paint is prepared by dissolving, by weight, 30-40 parts of epoxy resin, 20-30 parts of modifier, 5-10 parts of filler, 15-20 parts of glass flakes, 5-15 parts of pigment, 5-10 parts of curing agent and 0.05-1 part of accelerant in a solvent. The modifier is prepared by mixing and dissolving phenolic resin and diisocyanate in acetone according to the molar ratio of hydroxyl to an isocyanate group being (0.9-0.99):1. The isocyanate-terminated phenolic modifier is prepared, the surfaces of the glass flakes are mechanically and chemically treated at the same time, the phenolic modifier and the glass flakes are added into the paint, and therefore the prepared coating has good coating performance, has the good adhesive property after being cured, has excellent high temperature resistance and corrosion resistance, and can be used under harsh conditions for a long time.

Description

【Technical field】 [0001] The invention relates to the technical field of chemical paint processing, in particular to an anti-corrosion paint and a preparation method thereof. 【Background technique】 [0002] Materials are often corroded due to changes in humidity or acidity and alkalinity in the environment during use. Therefore, anti-corrosion coatings are often sprayed on the surface of materials to prolong the service life of materials. Anti-corrosion coatings are generally made of matrix resin, filler material and curing agent, etc., and the coating is coated or sprayed on the surface of the material. After curing under certain conditions, a layer of adhesive film is formed to adhere to the surface of the material, and the material is separated from the air. Water vapor, oxygen, acid and alkali in the medium are isolated to achieve anti-corrosion effect and have a certain protective effect on materials. [0003] The coating prepared with epoxy resin as the base resin has...

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Problems solved by technology

[0003] The coating prepared with epoxy resin as the base resin has good adhesion, low shrinkage, stable size, excellent electrical properties, chemical resistance, easy configuration, simple process, wide service temperature, strong adaptability, low toxicity, and no harm. It is also small, does not pollute the environment, etc. It has good adhesive ability to various materials, and has many functions such as sealing, insulation, leak-proof, fixing, anti-corrosion, decoration, etc. It is called universal glue, but epoxy resin coating Long-term use of the coating under high temperature conditions is prone to aging and deformation, which affects the protective effect of the coating on the material; phenolic resin is a linear resin formed by condensation of phenol and formaldehyde. Phenolic resin has excellent high temperature resistance and good wear resistance. At high temperature, it can also maintain its structural integrity and dimensional stability. It is widely used in some high-temperature fields, such as refractory materials, friction materials, adhesives and foundry industries. Because phenolic resin molecules contain a large amount of phenol Hydroxyl, the molecular polarity is large, easy to absorb moisture, the finished product made of pure phenolic resin is brittle, and the practicability is not high

[0004] Glass flakes are made from molten medium-alkali glass above 1200°C through process steps such as bubble blowing, cooling, crushing, screening and grinding. The aspect ratio is as high as 30-120, and the glass flakes are arranged in parallel and overlapping in the resin. The palace structure forms a dense anti-seepage layer structure. The penetration of the corrosive medium in the cured resin must go through countless tortuous paths. Therefore, in a corrosion-resistant layer of a certain thickness, the distance of corrosion penetration is greatly extended, which is equivalent to Effectively increases the thickness of the glass flake anti-corrosion layer. The glass flake is an inorganic material with a smooth surface. After the glass flake is directly mixed with the organic resin matrix, its compatibility between the interfaces is poor, and it is easy to form gaps between the interfaces. Liquid and gas can It penetrates into the interior of the coating through the gap between the interfaces, affecting the performance and anti-corrosion effect of the coating, which is not conducive to the long-term use of the material in environments with high humidity and high salt spray concentration such as the seaside.

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