Process for preparing precursor fiber of cellulose base carbon fiber

Abstract

The preparation method of the precursor fiber of cellulose-based carbon fiber in chemical fiber production, first stirs and mixes the concentrated NMMO aqueous solution and the carbon black contained in the carbon black water dispersion at a weight ratio of 20 to 10000:1, and distills under reduced pressure to obtain a water-containing 24-28% NMMO / carbon black solution, and then add the cellulose pulp cut into small pieces and NMMO / carbon black solution into the dissolution kettle at a weight ratio of 5-15:100, and pass through static at 70-90°C. After swelling and strong stirring, the temperature is raised to 90-120°C, and the water is removed by stirring and vacuum distillation to generate a cellulose / NMMO / carbon black spinning stock solution with a water content of 12%-14%. The filaments yield precursor fibers of cellulose-based carbon fibers. Due to the addition of carbon black in the present invention, the carbonization yield and mechanical properties of the carbon fiber prepared after oxidation and carbonization treatment are all significantly improved; the carbon black aqueous dispersion with a smaller particle size or even nano-scale is used as an additive to make spinning The silk stock solution has good spinnability; the solvent used is non-toxic, the recovery rate is high, and the spinning process is simple and environmentally friendly.

Description

technical field [0001] The present invention relates to the preparation method of the precursor fiber of carbon fiber in the chemical fiber industry, particularly refer to the technology of adding carbon black to spinning the precursor fiber of cellulose-based carbon fiber in N-methylmorpholine oxide (NMMO) aqueous solution . The carbon fiber prepared by using the precursor fiber has high strength, high modulus, ablation resistance and other properties, and can be widely used in the fields of aviation, aerospace, military, energy, transportation and medicine. Background technique [0002] Carbon fiber is a fibrous carbon material, and its preparation is generally obtained by using organic polymer fibers as precursor fibers and undergoing oxidation and carbonization treatments. At present, the three major precursor fibers for preparing carbon fibers are polyacrylonitrile (PAN) fibers, pitch fibers and cellulose fibers. In the world carbon fiber market, PAN-based carbon fibe...

AI Technical Summary

Problems solved by technology

The production process of Lyocell is simple and clean. Compared with traditional viscose fiber, Lyocell fiber has the characteristics of round cross-section, uniform structure, high degree of orientation and crystallinity, and good mechanical properties. Moreover, its fineness can be adjusted by adjusting the spinning process. The parameters are controlled, and using this fiber as a precursor fiber can prepare cellulose-based carbon fibers with better performance than traditional viscose-based carbon fibers, but this method still has problems such as high cost due to insufficient carbonization yield.

Therefore, while reducing environmental pollution, further increasing the carbonization yield of cellulose-based carbon fibers and improving their mechanical properties have become one of the focuses of scientists, but so far there is no related patent