Capacitor coating with deep drawing resistant performance and high temperature yellowing resistance and preparation thereof

Abstract

The invention discloses a non-yellowing capacitor coating at a high temperature having deep drawing resistance performance and a preparation method thereof. The capacitor coating in the invention is prepared from the materials according to the following parts by weight: 20 to 50 parts of hyperbranched polyester resin, 1 to 7 parts of saturated polyester resin, 3 to 12 parts of isocyanate, 0 to 0.5 parts of adhesion promoter, 0 to 0.15 parts of slipping wax, 0 to 0.3 parts of organic tin catalyst, 2.0 to 6.0 parts of resin modifier, 0.07 to 1.0 parts of defoamer, 0.15 to 0.20 parts of flattingagent, and 30 to 62 parts of solvents. The hyperbranched polyester resin, saturated polyester resin and isocyanate are put into a container so as to prepare a mixture after high-speed dispersing; therest of the materials are then put into the mixture so as to mix homogeneously by medium-speed dispersing, thereby obtaining the non-yellowing capacitor coating at a high temperature having deep drawing resistance performance. The capacitor in the invention has the characteristics of deep drawing resistance, good percentage elongation of coating film and no yellowing at a high temperature.

Description

technical field

[0001] The invention belongs to the technical field of capacitor coatings, and in particular relates to a capacitor coating with deep drawing resistance and high temperature non-yellowing and a preparation method thereof. Background technique

[0002] Electronic components are used in different environments, so they have sufficient resistance to humidity, heat, mildew, salt spray, etc. Moisture has a particularly pronounced effect on components. Therefore, 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. The requirements for coating materials mainly have advantages in terms of dielectric properties, temperature resistance, mechanical strength, anti-aging, and moisture resistance.

[0003] The production of electronic capacitors generally adopts the vacuum impregnation process to coat the coating after the al...