A kind of water-based polyurethane three-proof paint for circuit board anticorrosion

Abstract

The invention provides waterborne polyurethane three-protection paint for circuit board anticorrosion. The waterborne polyurethane three-protection paint for the circuit board anticorrosion comprisesthe following preparing raw materials in parts by weight: 20-60 parts of waterborne polyurethane resin, 40-80 parts of deionized water, 0.1-15 parts of a drying auxiliary agent, 0.1-10 parts of a stabilizing agent, 0.1-10 parts of an auxiliary leveling agent, 0.1-10 parts of a defoaming agent, 0.3-5 parts of a sterilizing agent, 0.3-4 parts of a flatting agent, 0.3-2 parts of a fluorescent agent,0.3-2 parts of an anti-yellowing agent and 0.1-3 parts of other auxiliary agents.

Description

technical field [0001] The invention relates to the technical field of printed circuit board protection, in particular to a water-based polyurethane conformal paint for circuit boards. Background technique [0002] Conformal coatings are widely used for anti-corrosion protection of circuit boards of electronic and electrical equipment, such as smart home appliances, 3C products, automotive controls, variable frequency power supplies, industrial controls, aerospace, ships, energy systems, outdoor electronics, etc. By coating a layer of three-proof coating material (referred to as three-proof paint) on the surface of the circuit board, a transparent protective film is formed after curing at room temperature or heat to protect the circuit board from the external environment (moisture, mold, salt spray) , high dust, vibration, corrosive gas, etc.), improve the reliability of circuit boards, and increase the safety factor of electronic components. The water-based polyurethane co...

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Problems solved by technology

[0005] 1) Organic solvents are used as diluents, containing volatile organic compounds (VOCs), which volatilize into the air during the curing process, producing pungent odors, affecting the mood of employees and reducing work efficiency;

[0006] 2) VOCs are toxic and harmful gases, and long-term exposure will cause hidden dangers of occupational leukemia for employees;

[0007] 3) Pollution to the environment, environmental protection policy requirements are becoming more and more stringent, facing policy pressure;

[0008] 4) VOCs are flammable and explosive, and there are great safety hazards in the process of production, transportation and storage

[0009] 5) Under the action of light, heat, oxygen, especially ultraviolet rays, the urethane bond will be decomposed, the structure will be rearranged, and chromophoric groups such as quinone structure will be generated, which will cause yellowing, affect the appearance and even reduce the corrosion resistance Effect

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