Flame-retardant conformal coating for printed circuit board and preparation method thereof

Abstract

The invention discloses a flame-retardant conformal coating for a printed circuit board. The conformal coating comprises 45-52 parts of a main material and 2-4 parts of an auxiliary agent, wherein themain material is prepared from 30 to 35 parts of short-oil alkyd resin, 6-9 parts of dioctyl phthalate, 10-12 parts of polyvinyl acetate, 8-10 parts of xylene, 10-12 parts of ethyl acetate, 6-9 partsof trimellitic anhydride, 2-3 parts of 600-mesh transparent powder, 1-2 parts of a titanate coupling agent, 1-2 parts of cobalt naphthenate, 1-2 parts of butanone oxime, 2-4 parts of trichloroethyl phosphate and 4-5 parts of isocyanate; and the auxiliary agent comprises 2-4 parts of sepiolite fabric, 1-2 parts of isopropanolamine, 4-6 parts of diethylene glycol dibenzoate, 2-4 parts of propyleneglycol monomethyl ether, 1-3 parts of wool palmitic acid, 12-15 parts of boiled tung oil, 1-2 parts of oleic acid diethanolamide, 0.1-0.2 part of mustard oil, 9-12 parts of dimethyl carbonate and 1-2parts of polydimethylsiloxane. According to the flame-retardant conformal coating for the printed circuit board and the preparation method of the conformal coating, the environmental tolerance of theconformal coating is improved, a line of the circuit board is prevented from heating and catching fire especially in a high-heat environment, and the use safety of equipment is improved.

Description

technical field [0001] The invention relates to the technical field of printed circuit board protection, in particular to a flame-retardant conformal paint for printed circuit boards and a preparation method thereof. Background technique [0002] Printed circuit board refers to the formation of point-to-point interconnection lines and printed components on an insulating substrate according to a predetermined design, and is a provider of electrical connections for electronic components. Circuit boards are very common in daily life, ranging from small mobile phones, USB flash drives, and cameras to high-end products such as aerospace and high-speed trains. With the increasing variety and quantity of electronic products, it is particularly important to strictly control the quality of circuit boards to improve the competitiveness of electronic products. In the actual application process, the use environment of the circuit board is complex and diverse, and may face humidity, hig...

AI Technical Summary

Problems solved by technology

In the actual application process, the use environment of the circuit board is complex and diverse, and may face humidity, high heat, salt spray, low temperature, vibration, high dust and other environments. If no corresponding effective protection is carried out, the circuit board will quickly appear corrosion, deformation, Mildew, aging and other problems will eventually lead to circuit failure and equipment failure

[0003] In order to reduce the damage to the circuit board by the external environment and ensure the normal operation of the equipment, protective paint is often sprayed on the surface of the circuit board, also known as three anti-paint, and its main chemical components are acrylate, silicone, polyurethane, epoxy resin, etc. , the working principle is to form a protective film on the surface of the circuit board to protect the circuit board from the damage of the working environment, thereby improving the quality and reliability of the circuit board. Resist environmental pollutants, especially the corrosion of chemical pollutants, not easy to repair, toxic and harmful, etc., so it is necessary to improve the three anti-paint formula, further strengthen the comprehensive performance of the circuit board, improve the protection effect, in order to meet the rapid development of integrated circuit technology need

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