Process of preparing PDT copolyester fiber

Abstract

The process of preparing PDT copolyester fiber includes the following steps: 1. saccharifying and catalytically hydrogenating corn starch to prepare sorbitol, catalytically hydrogenating to prepare multicomponent mixed alcohol, and fractionating in a fractionating tower at 182-212 deg.c to obtain corn-base ethylene glycol product of 89-99 % content and with ethylene glycol as main component and other diols; 2. detecting the contents of component diols in the ethylene glycol product and adding insufficient components for content fluctuation controlled within 10-30 %; and 3. adding nanometer titania in 0.05-1 wt% into the corn-base ethylene glycol product, and copolymerizing together with terephthalic acid at 280-288 deg.c for 5-7 hr to prepare PDT copolyester. The process is suitable for industrial production.

Description

technical field

[0001] The invention belongs to the field of chemical fiber preparation, in particular to a preparation method of PDT copolyester fiber. Background technique

[0002] In the preparation methods of fibers such as existing copolyester PET, PTT, and PBT, the dibasic alcohol used for reacting with terephthalic acid all comes from petroleum industry, and the kind of dibasic alcohol used for preparing every kind of copolyester fiber No more than three kinds, that is to say, there is no multi-component diol product (called corn-based ethylene glycol product) made from corn raw material with ethylene glycol as the main component to prepare copolyester fiber. Contents of the invention

[0003] The technical problem to be solved by the present invention is to provide a preparation method of copolyester fiber, which realizes the industrialized production of corn-based ethylene glycol route.

[0004] A kind of preparation method of PDT copolyester fiber of the present...