Preparation method of low-melting-point PBT copolyester fiber

Abstract

The invention provides a preparation method of a low-melting-point PBT copolyester fiber, which comprises the following steps: butanediol is used as a raw material, a direct esterification method is adopted, dibasic acid and dihydric alcohol monomers with the molar ratio of 1:1.5-1:2.5 are simultaneously added, esterification, prepolymerization and polymerization reaction are carried out under theaction of a catalyst, and the PBT copolyester with the melting point ranging from 140 DEG C to 190 DEG C is prepared, wherein the esterification reaction and the prepolymerization reaction are carried out in two stages. The prepared PBT polyester is subjected to melt spinning after being dried, and is subjected to oiling, balancing, winding and drafting after being cooled. According to the preparation method of the low-melting-point PBT copolyester fiber,, dibasic acid and dihydric alcohol monomers are simultaneously added in the polymerization process of the PBT, and the esterification and prepolymerization reaction processes are carried out in stages, so that the melting point of the PBT is reduced, the fluidity of the PBT melt is improved, the toughness of the PBT is increased, the impact strength is improved, the prepared low-melting-point PBT polyester fiber has the advantages of low modulus, high elasticity and good hand feeling, and can also be used as a substitute adhesive torealize the bonding function.

Description

technical field [0001] The invention relates to a polyester, in particular to a preparation method of a PBT copolyester fiber. Background technique [0002] Low-melting point copolyester is a polyester with a lower melting point (90-240°C) obtained by chemically modifying ordinary polyester. Because its structure is similar to that of ordinary polyester, it retains the common polyester Part of the properties of esters, with good compatibility. This modified copolyester not only has low melting point, good fluidity, but also moderate price, so it is extremely versatile. At present, the research on low-melting-point polyester at home and abroad mainly uses PET polyester for copolymerization modification, and there are few studies on PBT copolymerization-modified low-melting point polyester. The crystallization speed of PBT polyester is very fast, the crystallinity is high, and the processability is excellent. Therefore, the low-melting point PBT product modified with PBT pol...

AI Technical Summary

Problems solved by technology

[0003] As a new environmentally friendly and healthy adhesive material, low-melting-point fibers avoid the use of chemical adhesives in the production of hollow non-woven fabrics, and are more and more welcomed and recognized by downstream enterprises of chemical fibers. At present, the research on low-melting point polyesters at home and abroad mainly focuses on PET polyester is modified by copolymerization, which is not seen for PBT copolymerized low-melting point fibers

However, low-melting point PET fiber products have poor crystallization properties, poor molding, and poor processing performance. The dyeing performance, resilience, and flexibility of low-melting point PBT polyester fibers are better than low-melting point PET polyester fiber products.