Solvent-free silane-terminated modified polyether three-proofing paint and preparation method thereof

Abstract

The invention provides a solvent-free silane-terminated modified polyether three-proofing paint. The solvent-free silane-terminated modified polyether three-proofing paint comprises the following rawmaterials: 50-65 mass parts of alpha-silane-terminated modified polyether resin; 30-40 mass parts of gamma-silyl-terminated modified polyether resin; 2-5 mass parts of a plasticizer; 1-2 mass parts byof a moisture scavenger; 1-5 mass parts of a cross-linking agent; 0.5-1 mass part of a heat-resistant stabilizer; 1-3 mass parts of an adhesion promoter; and 0.5-1 mass part of an ultraviolet absorber. According to the invention, silane-terminated modified polyether with specific mass parts is selected as matrix resin to compound with the cross-linking agent, the adhesion promoter, the moisture scavenger and a variety of stabilizers, the three-proofing paint does not contain isocyanate group or metal ion catalyst, is free of solvent and low in viscosity, is suitable for brushing and spraying,has good adhesion to a substrate, high tensile strength and excellent flexibility, and at the same time has excellent water resistance and salt spray resistance.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a solvent-free silyl group-terminated polyether conformal paint and a preparation method thereof. Background technique [0002] With the development of science and technology, automobile control, 3C products, and smart home appliances are also constantly being updated. Among them, the safety and stability of electronic and electrical equipment is very important. It is usually necessary to coat a layer of material on the surface of the electronic circuit board. A transparent protective film is formed on the surface of the board, which plays the roles of waterproof, insulation, salt spray resistance, mildew resistance and corrosion resistance. This type of coating material is usually called conformal paint. According to the type of resin, it is usually divided into acrylate type, polyurethane type, and silicone type; according to the type of solvent, it can be divided into solven...

AI Technical Summary

Problems solved by technology

Among them, the silicone type conformal paint has better flexibility and high temperature resistance. Due to the high viscosity of the matrix resin and the slow surface drying time, a large amount of organic solvents are usually added, and the volatility is strong, which will cause discomfort to the workers during operation. In severe cases, it will affect your health; polyurethane types include water-based, solvent-based, and solvent-free. The effect of silane-modified polyurethane is better, but there is a problem of short storage stability; the acrylic conformal coating contains a large amount of solvent or water, and the bonding strength to the substrate is not high

[0004] Prior art CN201911065005.1 discloses a polyurethane-acrylic type conformal paint, which does not contain organic solvents, solves the problem of difficult curing in dark places through UV-moisture dual curing, hardness, flexibility, water resistance, acid and alkali resistance Preferably, since moisture curing is to retain isocyanate groups at one end of the molecular chain, long-term exposure is potentially harmful to the human body

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