METHOD OF OBTAINING COMPOSITE FIBRE BASED ON HYDROLYTIC LIGNIN WITH POLYACRYLONITRILE Russian patent published in 2014 - IPC D01F6/54 C08L97/00 D01F8/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of obtaining a composite fibre based on hydrolytic lignin with polyacrylonitrile and can be used for the formation of pre-cursor composite fibres as an initial material for the formation of carbon fibres of increased strength and heat resistance. Finely disperse hydrolytic lignin is dissolved in dimethylsulphoxide until complete swelling at room temperature for 10-20 h and mixed with a solution of polyacrylonitrile in dimethylsulphoxide until a homogenous and moulding solution, containing 70-80 wt % of hydrolytic lignin, is formed. The solution is filtered, degassed, charged into the draw plate tank and supplied into the spinning bath of an installation for the preparation of composite fibres.

EFFECT: application of the invention ensures an increased value of utilised hydrolytic lignin, increased strength of the pre-cursor fibre to 50 MPa, increase of heat resistance to 30-40% at 800°C in comparison with 20% for pure hydrolytic lignin, improvement of production ecology.

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