Preparation method of high-viscosity polyester chip regenerated by chemical method for industrial yarn

The invention discloses a preparation method of a chemically regenerated high-viscosity polyester chip for industrial yarns, which comprises the following steps: by taking a super-bright chemically regenerated polyester chip with intrinsic viscosity of 0.673 +/-0.1 dL/g and terminal carboxyl group content of 22 +/-2mol/t as a basic chip, controlling the basic chip with different hundred-grain weights, drying at a certain temperature, hardening the surface of the chip, and preparing the chemical regenerated high-viscosity polyester chip for the industrial yarns. And the temperature is increased to the condensation polymerization temperature at a heating rate to complete polymerization, and the temperature is reduced to room temperature at a certain cooling rate after the polymerization is finished. The method provided by the invention can overcome the problems of slow viscosity increase, low efficiency, easy yellowing of the product hue and the like caused by the existence of the terminal methyl group in the c