METHOD AND FORMULATION FOR PREPARING LIGNIN FIBRES
The invention relates to a formulation for melt-preparation of lignin-based fibres, which are precursors of carbon fibres. Said formulation comprises lignin, a plasticiser and a cross-linking agent capable of cross-linking with the lignin at a temperature at least 10° C higher than the glass-transition temperature of the intimate blend of the lignin and the plasticiser. A method for preparing lignin-based fibres using this formulation comprises the hot extrusion spinning of an intimate blend of the components of the formulation, under adequate conditions for cross-linking the cross-linking agent and the lignin in the terminal area of the extrusion device used.