The invention provides a method for degradation of a
composite material by directional
bond breaking and
recovery of fibers from the
composite material. The method comprises the following steps that (1) the
composite material is
cut into composite material blocks with the target size for standby application; (2) the composite material blocks, solvents,
metal salts, ligands, pH regulators and oxidants are mixed evenly, and then heated, the composite material blocks are naturally cooled to the
room temperature after being completely degraded, and then high-speed
centrifugal separation is conducted to obtain crude
fiber products; and (3) the crude
fiber products are washed and dried, and finally
fiber fine products are obtained. According to the method, through the hot
solvent effect, unsaturated complexation and weak complexation, the solvents, the
metal salts, the ligands, the pH regulators, the oxidants and the composite material are mixed, and then heated, directional
bond breaking degradation of resin is achieved, finally the fibers with little surface resin residue, basically no defect and the
fiber strength retention rate up to 97.1% are obtained, and the degradation rate of the resin is as high as 100%.