A method of obtaining a polyimide insulating film

 

(57) Abstract:

Usage: in electrical engineering, in particular in the manufacture of electrical insulating materials. The essence of the invention: a method of obtaining a polyimide insulating film is loaded into a reaction chamber of a solvent (dimethylformamide or dimethylacetamide) and 4,4-diaminodiphenyl ether, mixing, loading dianhydride pyromellitic acid, stirring, pouring the film, its cyclization and orientation. Dianhydride load in two stages: first, with 18.1 wt. o'clock , the second - 0,225 - of 0.625 wt. hours Between these stages download 0,20 - 3,52 wt. hours of polymethylphenyl siloxane fluid, the mixing is carried out at 15 - 25C. table 1.

The invention relates to electrical engineering, mainly to the production technology heat insulating materials.

A method of obtaining a polyimide (polypyromellitimide) film, in which first receive Polynicotinate in the solvent of the amide type of pyromellitates of dianhydride and 4,4' -diaminodiphenyl ether, then the solution Polynicotinate cast in the form of a film, which turns into an imide by reaction with circuit cycles the residual high dielectric strength and adhesive properties, and high values of coefficient of friction and roughness impede quality rewind the film into a roll.

A method of obtaining a polyimide film in which the polyimide prior to casting type compounds titanium.

However, the introduction of a polyimide titanium does not increase its electrical characteristics.

The purpose of the invention is to improve the quality of the film by improving its electrical and mechanical characteristics.

Using the proposed method to obtain a polyimide film will simplify the technological operations of the tint film and its winding into a roll by reducing roughness and friction coefficient, increasing the slip film on the film and on the metal, which leads to the improvement and preservation of the quality of the finished film. In addition, the proposed method allows to obtain a polyimide film of smaller thickness for use as insulation film capacitors, cables and wires, magnet media, metallized foil and dielectric, as well as in multi-layer insulating materials by improving the electrical characteristics and adhesion properties.

Cassagneau amide solvent and 4,4' -diaminodiphenyl ether, mix them, download dianhydride pyromellitic acid, stirred to obtain a viscosity sufficient for processing into a film of the resulting solution Polynicotinate cast film and produce its orientation, and the imidization, characterized in that the solvent used dimethylacetamide or dimethylformamide, dianhydride load in two stages, between these stages of the download is 0.20. . . 3,52 wt. including polymethylphenylsiloxane fluid in the first stage load of 18.1 wt. hours of dianhydride and the second 0,225. . . of 0.625 wt. hours , with stirring after the first stage of loading dianhydride and after loading polymethylphenylsiloxane fluid is carried out at 15. . . 25aboutWith over 50. . . 70 min, and the stirring after the final loading of the dianhydride is carried out until the solution viscosity of 3000. . . 5000 Poises at a temperature of 20. . . 30aboutWith over 50. . . 70 minutes

The invention is carried out as follows.

In the reaction capacity load 210 wt. hours of dimethylformamide or dimethylacetamide, and introduce a 17 wt. including 4,4' - diaminodiphenyl ether, stirred at 15aboutC for 60 min, administered to 18.1 wt. CH dianhydride pyromellitic acid and stirred etc who are at 25aboutC for 70 min, enter dianhydride pyromellitic acid number 0,225. . . of 0.625 wt. hours to obtain a solution viscosity of 3000. . . 5000 Poises after stirring at 25aboutC for 65 min, cast film and carry out the imidization with increasing temperature up to 300. . . 350aboutWith simultaneous orientation is carried out by stretching the film in the longitudinal direction.

Adhesive properties (adhesive strength) of the obtained film to adhesive compositions based on silicone, epoxy, polyurethane, polyamide, polyester and other compounds is increased by 20. . . 50% , while processing a film by corona discharge or innoplast irradiation at 50. . . 300% . Value of electric strength (APW. ), friction coefficient and roughness of the films shown in the table. (56) U.S. Patent N 4742099, class C 08 K 5/52, 1988.

USSR author's certificate

N 329188, class C 08 G 3/10, 1969.

A method of OBTAINING a POLYIMIDE INSULATING FILM, wherein in the reaction capacity load amide solvent and 4,4-diaminodiphenyl ether, stirred them, download dianhydride pyromellitic acid, stirred to obtain a viscosity sufficient for processing in the film, from the received RA is o improve the quality of the obtained film by improving its electrical and mechanical characteristics, as the solvent used dimethylacetamide or dimethylformamide, dianhydride load in two stages, between these stages download 0,20 - 3,51 wt. including polymethylphenylsiloxane fluid in the first stage load of 18.1 wt. hours of dianhydride and the second - 0,225 - of 0.625 wt. hours , with stirring after the first stage of loading dianhydride and after loading polymethylphenylsiloxane fluid is carried out at 15 - 25owithin 50 to 70 minutes, and the stirring after the final load dianhydride carried out until the solution viscosity of 300 to 5000 N at 20 - 30oWith over 50 - 70 minutes

 

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