Efficient preparation method of polyacrylonitrile-based carbon fibers

The invention relates to an efficient preparation method of polyacrylonitrile-based carbon fibers, belonging to the technical field of preparation of carbon fibers. The invention is characterized in that the technical link of the polyacrylonitrile solvent spinning process is reduced, i.e. a single-channel drawing is adopted instead of the high-temperature drawing technique at higher than 100 DEG C, the drawing temperature is controlled at 80-100 DEG C, the drawing multiple is 3.0-8.0, and the drying densification and thermoforming are completed synchronously; and the subsequent heat treatment process adopts the normal preoxidation and carbonization techniques, thereby achieving the goals of low-cost production of carbon fibers on the premise of not changing the properties of the carbon fibers. The preparation method provided by the invention is simple, and has the advantages of shorter production time and lower production cost.