METHOD FOR PRODUCING POLYESTER RECYCLED FIBER

摘要

PURPOSE: A method for producing a polyester recycled fiber is provided to improve the natural viscosity, and to have the stable pyrolysis by using the 2,2'-vis oxazoline as an agent for extending a chain having the good reactivity with the end carboxyl of the polyester and having the excellent thermal characteristic. CONSTITUTION: A recycled fiber is produced by melting and mixing 0.1-10wt% of the 2,2'-vis oxazoline as an agent for extending a chain for the waste polyester or for the copolymer thereof. Thereby the terminal carboxyl operated as a catalyst about a pyrolysis of the polyester is blocked, and the more improved natural viscosity than the starting polyester is obtained by pair reacting between the terminal carboxyl of the starting waste polyester. Therefore, the pyrolysis is prevented though receiving a melted processing again.