METHOD FOR MANUFACTURING ARTICLE OF POLYIMIDE CARBON PLASTICS Russian patent published in 1997 - IPC

FIELD: manufacturing articles of polyimide carbon plastics. SUBSTANCE: method involves impregnation of cloth of carbon fiber with solution which contains stoichiometric amount of 2,2-bis-(3,4-dicarboxyphenyl)hexafluoropronane and mixture of p-phenylene diamine with m-phenyldiamine (their quantities being 95 mol % and 5 mol % respectively). Then packet of layer of said prepreg is prepared, said packet being hardened in autoclave. The process takes place by heating to 121-204 C, pressure inside autoclave being at least 12.66 $$$. Then thus prepared article is cooled and affected by additional hardening. The process takes place in oven under vacuum by heating to 371-385 C, heating rate being 0.5-1.5 C/min. The process is carried out till articles having glass transition temperature not less 388 C is produced. Desired articles are allowed to heat higher that 177 C, they are able to retain their size at elevated temperature. EFFECT: improves efficiency of the method. 2 cl