METHOD OF OBTAINING CARBON FIBROUS MATERIALS FROM HYDRATE CELLULOSE FIBERS Russian patent published in 2018 - IPC D01F9/16 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering, specifically to production of carbon fibre materials in the form of yarns, bundles, belts, fabrics, etc, by thermochemical treatment of hydrated cellulose (HC) fibres. Resulting carbon fibrous materials (CFM) are used as reinforcing fillers for composites with polymer, carbon, ceramic and metal matrices for various purposes: thermal insulation of high-temperature thermal equipment; flexible electric heaters; electrodes of electrolytic processes; high temperature filters for aggressive gases, liquids and melts; in the production of sports goods; in medicine. Method of obtaining carbon fiber materials from cellulose hydrate fiber includes a heat-moisture treatment of the initial HC-fiber in a chemical-relaxer solution, washing, drying, processing in a solution the components of a carbonization catalyst, in a superheated vapor-air medium, the final ventilated drying and subsequent carbonization and graphitization, in this case, according to the invention, the initial HC-fibers before the heat-moisture treatment and / or processing in solution of the components of the carbonization catalyst, and also, before carbonization, is subjected to intense short-term heating (ISTH) to the temperature of the beginning of the active pyrolysis of macromolecules of cellulose in the fiber for 1.0–3.5 min, at the same time, the carbonization in a non-oxidizing atmosphere with increasing zone heating is subjected to a precursor, which has been previously intensely briefly heated to the temperature at which the active pyrolysis of the fiber occurs, and the temperature of the beginning of the heat treatment during carbonization is set to 10–25 °C is higher than the temperature of the precursor, and intensive short-term heating of the HC-fibers is carried out by infrared radiation.

EFFECT: carbon fibrous materials obtained by the proposed method have increased by ~10 % strength, with an increased process productivity of at least 10 times.

3 cl, 2 dwg, 1 tbl