Paint for improving damp heat resistance of precise metal film resistor and preparation method of paint

Abstract

The invention discloses paint for improving damp heat resistance of a precise metal film resistor. The paint comprises, by mass, 30-60% of thermoset phenolic resin, 10-40% of epoxy resin, 5-20% of multi p-pi and pi-pi conjugated bond modified material and 25-40% of diluent. Firstly, 9-fluorenone is dissolved in liquid organic ketone according to the mass ratio of 1:1, a 9-fluorenone solution is prepared, or novolac epoxy resin is diluted through the liquid organic ketone, and a novolac epoxy resin solution is prepared; the epoxy resin is diluted through ethylene glycol mono-ether, and an epoxy resin solution is prepared; the epoxy resin solution and the base material thermoset phenolic resin are mixed under the stirring condition, the 9-fluorenone solution or the novolac epoxy resin solution is added, the specific gravity is adjusted to be 0.98 through the diluent, and the paint suitable for coating of the metal film resistor on a production line is prepared. The packaging paint is stable in performance when used for a long time, paint layering can not happen even the paint is stored for two years, and when the paint is applied to resistor protection in the damp heat environment, the resistance change rate meets the technical requirement that deltaR / R is smaller than or equal to 0.4%.

Description

technical field [0001] The title of the invention is about electronic information materials, especially a method for improving the heat and humidity resistance of packaging materials for precision metal film resistors, specifically a phenolic resin-based high temperature and high humidity resistant composite coating for precision metal film resistors . Background technique [0002] Precision metal film resistors are widely used in precision instruments, aviation, aerospace and other fields, and their reliability affects the responsiveness and stability of long-time working circuits. However, for precision metal film resistors working in hot and humid environments, they are required to have better resistance to hot and humid performance, which puts forward higher performance requirements for their packaging and protection materials. For packaged finished resistors working in hot and humid environments, from the perspective of reliability, they are mainly subjected to thermal...

AI Technical Summary

Problems solved by technology

Although the encapsulation protective coating prepared by the above method can meet the requirements of precision metal film resistance to heat and humidity performance, there is a problem of poor stability in the long-term storage process for the encapsulation material modified by nanoparticles

It was found in the application that for nano-SiO stored for more than 3 months 2 Modified composite packaging materials, all of which will produce nano-SiO 2 The problem of settlement, separation from the polymer resin matrix makes the performance of the packaging material unstable, thus limiting the application of the prepared resistance composite packaging material

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