METHOD OF PRODUCING CARBON FIBER AND BASED MATERIALS Russian patent published in 2021 - IPC D01F9/16 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of producing carbon fiber and materials based thereon from initial cellulose fibrous material. Method involves impregnation of initial cellulose fibrous material in a liquid-phase organosilicon composition and subsequent thermal treatment, including thermal relaxation, pyrolysis, carbonization and graphitization, characterized in that said method is carried out in continuous mode, and as initial cellulose fibrous material, hydrate-and-cellulose threads are used, impregnation of which is carried out in zero-deformation mode in aqueous emulsion of liquid oligomeric resins with content of silanol groups reaching values from 5 % to 15 %, thermal treatment is carried out of textile materials made from hydrated cellulose threads impregnated in an aqueous emulsion of liquid oligomeric resins, wherein pyrolysis is carried out in eight temperature zones, in separate furnaces for each temperature zone in nitrogen medium with temperature rise by zones and degree of thread deformation: in the first zone, pyrolysis is carried out at temperature of 200–220 °C and degree of deformation of 0-(-5) %, in the second zone – at temperature of 220–240 °C and degree of deformation of 0-(-5) %, in the third zone – at temperature of 250–270 °C and degree of deformation of 0-(-5) %, in the fourth zone – at temperature of 270–300 °C and degree of deformation of 0-(+20) %, in the fifth zone – at temperature of 310–380 °C and degree of deformation of (-40)-(+45) %, in the sixth zone – at temperature of 410–540 °C and degree of deformation of (-5)-(+10) %, in the seventh zone – at temperature of 550–670 °C and degree of deformation of 0-(+10) %, in the eighth zone – at temperature of 680–720 °C and degree of deformation of 0-(+10) %, wherein pyrolysis products are removed from each temperature zone and afterburned in air flow, and thermal relaxation is carried out in air at temperature (180–200) °C in free shrinkage mode, carbonisation is carried out at temperature (1000–1100) °C, and graphitization is carried out at temperature (2200–2500) °C at drawing up to (+10 %).

EFFECT: improved physical and mechanical properties of carbon fibrous materials.

3 cl, 1 tbl, 8 ex