Preparation method of flame-retardant UV-moisture dual-curing polyurethane acrylate conformal coating

Abstract

The invention discloses a preparation method of flame-retardant UV-moisture dual-curing polyurethane acrylate conformal coating. The method comprises the steps of: taking UV-moisture dual-curing polyurethane acrylate resin containing a phosphate ester compound as a base material, and adopting a low-odor and low-irritation reactive diluents matched with a photoinitiator to prepare a flame-retardantUV-moisture dual-curing polyurethane acrylate conformal coating. The flame-retardant UV-moisture dual-curing polyurethane acrylate conformal coating does not contain a volatile organic solvent, has aflash point higher than 61 DEG C, has low odor, is a non-hazardous chemical three-proofing paint, and can be stored and transported according to conventional chemicals; a UV and moisture dual-curingmechanism is adopted, so that the curing speed is high, and the efficiency is high; and the coating film of the flame-retardant UV-moisture dual-curing polyurethane acrylate conformal coating has highwear resistance, high salt spray resistance, high damp-heat resistance, high acid and alkali resistance and an excellent electrical insulation performance, and can be widely applied to the high-corrosion-resistance fields of power supply frequency conversion, automotive electronics, industrial control, communication, household appliances, military industry and the like.

Description

technical field [0001] The invention relates to the field of conformal paint for circuit boards in the electronics industry, in particular to a method for preparing a flame-retardant UV-moisture dual-curing polyurethane acrylate conformal paint. Background technique [0002] Conformal paint is a special formula coating material, which can be widely used in the protection of electronic and electrical equipment circuit boards. Apply the conformal paint on the surface of the circuit board to form a transparent protective film, which can protect the circuit board from damage in the environment of humidity, mold, salt spray, chemical corrosion, high dust, vibration, etc., and improve the circuit quality. The reliability of the board increases the safety factor of the entire electronic component. In terms of chemical composition, conformal coatings can be divided into three main categories: silicone conformal coatings, acrylic conformal coatings and polyurethane conformal coating...

AI Technical Summary

Problems solved by technology

The main problems of solvent-based polyurethane conformal coatings are: 1) Some solvents volatilize into the air, which will cause irritation, and long-term exposure may induce occupational diseases; 2) Some solvents have a strong pungent smell, which affects the working environment and reduces work efficiency; 3 ) Some solvents are toxic and harmful solvents, which will pollute the environment. Environmental protection policy requirements are becoming more and more stringent, and they are facing policy pressure; 4) Some solvents are flammable and explosive, and there are great safety hazards in the process of production, transportation, and storage

However, ultraviolet light is a necessary condition for UV curing. When ultraviolet light is blocked and cannot penetrate the conformal coating, these conformal coatings will remain unreacted and uncured, causing the phenomenon that the shadow area of ​​the circuit board is not dry. At the same time, Unreacted and uncured wet conformal coating may chemically migrate to adjacent cured areas, thereby weakening the performance of the cured area conformal coating over time, increasing the reliability risk of the circuit board

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