METHOD FOR PRODUCING A HIGH-TEMPERATURE COMPOSITE MATERIAL Russian patent published in 2022 - IPC C08G6/00 

FIELD: polymer chemistry.

SUBSTANCE: invention relates to the field of polymer chemistry and technology for the production of polymer composite materials (PCM), and in particular to a method for producing PCM with a phthalonitrile matrix using a solutionless technology, as well as a method for producing a high-temperature composite material for use in the aviation and space industries. The method for obtaining a high-temperature composite material consists in using a silica thread woven into a knitted fabric as a reinforced silica filler, and to maintain its woven state, Arselon yarn is integrated into the latter, which is removed when heated to 400-600°C for 2-12 hours in an air atmosphere, after which the silica filler is impregnated with a powdered phthalonitrile binder, spreading the calculated amount of binder between the layers of the filler so that the lowest and highest layers of the binder make up half the mass of the inner layers, and the powder is sintered at 50°C for 10 minutes after layouts of each layer. The content of the binder in the composite should not exceed 55% of the total mass of the filler and binder. Curing after impregnation of the resulting composite mixture is carried out in an autoclave, heating the mixture obtained above to a temperature of 190°C at a rate of 0.5-2°C/min with holding for 4 hours at a pressure of 8 bar, after which the process of post-curing of the resulting composite material is performed at temperature 330°C for 8 hours and atmospheric pressure.

EFFECT: invention makes it possible to obtain a high-temperature composite material and products from it by molding methods with predictable strength parameters without the use of organic and inorganic solvents and salts, as well as without powdered metals of molybdenum, nickel, copper, etc.

2 cl, 4 dwg, 1 tbl