Environment-friendly conformal coating and preparation method thereof

Abstract

The invention discloses an environment-friendly conformal coating which is characterized by comprising the following raw materials in parts by weight: 3-6 parts of octa-aminophenyl POSS, 10-15 parts of epoxy-terminated polyurethane, 20-30 parts of 3-azabicyclo [3,1,0] hexane-2-formic acid modified amino-terminated polyurethane, 15-25 parts of 2-vinyl-3H-4-quinazolinone / 2-(5-chloro-2H-benzothiazole-2-yl)-6-(1,1-dimethylethyl)-4-ethylphenol / 2-trimethylsiloxy-1,1,1,5,5,5-hexafluoro-2-pentene-4-one / 3-(2-propenyl seleno)-l-alanine / glycidyl acrylate copolymer, 3-6 parts of polyethylene glycol dicarboxylic acid modified nano zinc oxide, 3-5 parts of a drier, 1-3 parts of a defoamer, 0.5-1.5 parts of an antistatic additive, 25-35 parts of isopropanol and 0.5-1.5 parts of an emulsifier. The invention also discloses a preparation method of the environment-friendly conformal coating. The environment-friendly conformal coating has better comprehensive performance, better moisture-proof, fog-proofand mildew-proof effects, better electrical insulation performance, wear resistance, high temperature resistance, solvent resistance and chemical resistance, higher adhesive force, and safe and environment-friendly preparation and use processes.

Description

technical field [0001] The invention relates to the technical field of three-proof paint, in particular to an environment-friendly three-proof paint and a preparation method thereof. Background technique [0002] With the continuous progress of the society and the rapid development of the economy, electronic products are gradually developing in the direction of miniaturization, integration, precision, and multi-function. come higher. After the electronic components are assembled, the circuit board may be in different environments during use, such as humidity, smog, chemical corrosion, high dust, vibration, etc., which will cause problems such as mildew and corrosion on the circuit board, resulting in the occurrence of problems on the circuit board. Fault. Therefore, in order to prevent moisture, salt spray, and mold, in the electronics industry, three anti-paints are usually coated on circuit boards to form a protective layer, which can improve the quality reliability and ...

AI Technical Summary

Problems solved by technology

[0004] The common three anti-paints in the prior art can be divided into three types: alkyd, acrylic, and silica gel in terms of chemical composition. Weak resistance, moisture-proof, anti-fog, anti-mildew effect is not ideal, cold and heat shock resistance, aging resistance, ozone corrosion resistance and other shortcomings

Due to the large molecular gap, the silica gel-based conformal paint can easily absorb sulfur dioxide, hydrogen sulfide and other sulfur-containing substances in the air between molecules, forming vulcanization of solder joints and causing circuit board failure

In recent years, polyurethane conformal paint has appeared on the market. This conformal paint has excellent electrical insulation performance, moisture resistance, solvent resistance, salt spray corrosion resistance and chemical resistance, good wear resistance and good adhesion. , but its high temperature resistance is relatively poor, it is sensitive to water during the curing process, the coating has poor heat resistance and is easy to yellow

In addition, the three anti-paint systems on the mainstream market contain aromatic solvents or lead-containing substances, which are harmful to the human body.

[0005] The application number is 201710796801.7, which discloses a conformal paint for switch state display. Although it has many ingredients mixed, it has poor moisture resistance, high temperature resistance, and peeling resistance when used, and it is easy to fall off, resulting in a lack of protective layer on the surface of the circuit board.

Moreover, the breakdown resistance is weak, and it is easily affected by the current intensity during frequent use, which still leads to damage to electronic components.