Polyimide coating preparation method and filter material device

Abstract

The invention belongs to the field of polyimide coatings, and particularly relates to a polyimide coating preparation method, which comprises the following steps: 1, raw material preparation: preparing 98.5% by mass of a polyimide coating and 1.5% by mass of 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane; 2, raw material containing: adding the polyimide coating obtained in the step 1 into a flask, and plugging the flask with a ground glass plug; step 3, drying: putting the flask into an electric heating constant-temperature blast drying box which is heated to 50 DEG C; and 4, stirring and mixing: inserting a mechanical stirring paddle of a motor stirrer into the flask, stirring, and dropwise adding 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane in the stirring process. According to the invention, 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane is introduced into the polyimide coating to form siloxane chain links, so that the internal stress, dielectric constant and water absorption rate can be effectively reduced, and the adhesion to glass is improved.

Description

technical field [0001] The invention relates to the technical field of polyimide coatings, in particular to a preparation method of polyimide coatings and a filter material device. Background technique [0002] Polyimide (Polyimide, referred to as PI), refers to a class of polymers containing imide rings (-CO-NH-CO-) in the main chain, and is one of the organic polymer materials with the best comprehensive performance. The high temperature is above 400°C, the long-term use temperature range is -200~300°C, there is no obvious melting point, high insulation performance, the dielectric constant is 4.0 at 103 Hz, and the dielectric loss is only 0.004~0.007. It belongs to F to H class insulation materials. There are many kinds and forms of polyimide, and there are many ways to synthesize it, so it can be selected according to various application purposes. This kind of flexibility in synthesis is also difficult for other polymers to possess. [0003] Coatings made of polyimide ar...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of polyimide paint preparation method and filter material device, solved the problem that existing polyimide paint can't reduce internal stress, dielectric constant, water absorption, also solved the problem to glass The problem of low adhesion also solves the problem that the existing polyimide coating contains large particles that cannot be removed and affects the strength and temperature resistance of the coating

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