A high-speed spinnable polybutylene terephthalate resin and a method for preparing the same

By controlling the content and molecular weight distribution of p-TA and 4-CBA, a PBT resin with a narrow molecular weight distribution and a high melting point was prepared, which solved the problems of filament drift and breakage of recycled PBT resin in the high-speed spinning process, and achieved high crimp shrinkage rate and hydrolytic stability, thus meeting the production needs of high-end textile fibers.

CN121895548BActive Publication Date: 2026-06-05JIANGSU HESHILI NEW MATERIAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU HESHILI NEW MATERIAL
Filing Date
2026-03-24
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing recycled polybutylene terephthalate resin (r-PBT) has a wide molecular weight distribution and low melting point, which makes the fibers prone to spun fibers or broken ends during high-speed spinning, and makes it difficult to meet the crimp shrinkage requirements of high-end high-elastic fabrics.

Method used

PBT resin with narrow molecular weight distribution and high melting point was prepared by polycondensation of regenerated terephthalic acid (r-PTA) and 1,4-butanediol (BDO). The p-TA was controlled to be ≤30ppm, 4-CBA to be ≤10ppm, the intrinsic viscosity (IV) was 0.80-1.15dL/g, and the molecular weight distribution index (PDI) was 1.8-2.2. By limiting the terminal carboxyl group content (AV) to ≤20mol/t, the synchronous growth of molecular chains and the stability of melt flowability were ensured, and the widening of molecular weight distribution was avoided.

Benefits of technology

It achieves stable spinning speed of 2000-2200m/min, DTY crimp shrinkage rate of over 40%, good fiber hydrolysis resistance and stability, and is suitable for the long-term use requirements of high-end fabrics, thus improving production efficiency and product quality.

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Abstract

This invention discloses a high-speed spun polybutylene terephthalate (PBT) resin, which is formed by the condensation polymerization of recycled terephthalic acid (r-PTA) and 1,4-butanediol (BDO). The terephthalic acid is recycled terephthalic acid (r-PTA), with a p-methylbenzoic acid (p-TA) content ≤30ppm and a p-carboxybenzaldehyde (4-CBA) content ≤10ppm. The intrinsic viscosity (IV) of the resin is 0.80 to 1.15 dL / g; the terminal carboxyl group content (AV) is ≤20 mol / t; and the molecular weight distribution index (PDI=Mw / Mn) is 1.8 to 2.2. The PBT resin of this invention has the characteristics of narrow molecular weight distribution, high melting point, and low acid value, and supports high-speed spinning at 2000-2200 m / min. The prepared DTY (dilatation textured yarn) fibers have high crimp shrinkage (good elasticity) and good hydrolytic stability, making them widely applicable in the textile fiber field, especially suitable for the production of high-end high-elastic fabrics.
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