Insulation stretch resistant coating, preparation method and application thereof

Abstract

The invention discloses an insulation stretch resistant coating, a preparation method and an application thereof. The coating comprises the following components of 15-35 parts of a polyester resin A, 5-25 parts of a polyester resin B, 3.5-5 parts of an amino resin, 0-0.5 part of an adhesion promoter, 0.1-0.2 part of a slip additive, 2.5-4 parts of a surface modification agent, 0.1-0.2 part of an antifoaming agent, 0.1-0.2 part of a flatting agent and 50-55 parts of an organic solvent. The method firstly mixing the polyester resin A, the polyester resin B, the amino resin and the organic solvent, and then adding and evenly mixing the adhesion promoter, the surface modification agent, the slip additive, a catalyst, the antifoaming agent and the flatting agent to obtain the insulation stretch resistant coating. The insulation stretch resistant coating is free from yellowing after the coating is roasted for 3 minutes at the temperature of 270 DEG C and capable of resisting high voltage of 1050V; the appearance of a capacitor paint film which is formed by deep-draw is flawless; the paint film is free from dissolution after-tack when soaked in carbon tetrachloride for 2 hours; and the paint film at the position of a notch of the capacitor is free from peeling off and foaming when the capacitor is cooked at the temperature of 100 DEG C for 30 minutes. Accordingly, the coating is wide in application prospect in electronic products.

Description

technical field [0001] The invention belongs to the technical field of insulating coatings, and in particular relates to an insulating stretch-resistant coating and its preparation method and application. Background technique [0002] In today's society, more and more electronic products appear in people's lives. Electronic products will be used in different environments, which require sufficient resistance to humidity, heat, mildew, salt spray, etc. The impact of humidity on components is particularly obvious, so most electronic components require coating encapsulation. This is a protective measure for insulation and moisture resistance, and it can also prevent mechanical abrasion and beautify the appearance. As one of the devices, the capacitor also has the above requirements. [0003] In recent years, the production of electronic capacitors generally adopts the vacuum impregnation process to coat the coating after the aluminum foil is stamped and formed. However, the ...

AI Technical Summary

Problems solved by technology

At the same time, the paint film must have high insulation. When the withstand voltage performance is insufficient, it will cause capacitor breakdown

At the same time, the stamped capacitors will be packaged on the circuit board after several times of high-temperature welding. Under high temperature, general polymer materials are prone to yellowing, which affects the appearance quality of the circuit board. Therefore, the temperature resistance of the paint film is also relatively low. demanding

At present, capacitor coatings on the market are mainly supplied by Japanese and Korean companies. Domestic coatings have black arcs on the surface of the capacitor after deep drawing, and the tensile performance is not up to standard, and the high voltage resistance is not up to standard. After the capacitor is baked at 270 ° C for 3 minutes, it turns yellow. The range of change is large, which seriously affects the appearance quality of the product

During the cleaning process of capacitors after production, due to incomplete curing of the coating, there will be anti-sticking phenomenon, which will affect the production yield