| abstract |
The present invention, by using a depolymerization catalyst, to add a diol consisting of ethylene glycol and 1,4-butanediol to the waste polyester, depolymerization to prepare an oligomer solution, purifying the oligomer solution, the purified oligomer solution Ethylene glycol was distilled at a pressure of 1 to 760 TORR and a temperature of 100 to 250 ° C., and dicarboxylic acid was added to the distilled oligomer solution, followed by condensation polymerization to produce a polyester. A thermal adhesive fiber made from polyester. The heat-bonded fiber of the present invention is free from deformation at a temperature below the melting point, has excellent elasticity, can maintain the strength and shape of the nonwoven fabric even at high temperatures, and is easy to process. |