纺织学报 ›› 2022, Vol. 43 ›› Issue (07): 9-16.doi: 10.13475/j.fzxb.20210507308

• 纤维材料 • 上一篇    下一篇

钛系聚对苯二甲酸乙二醇酯的增黏行为及其性能

林启松, 高峰, 吕汪洋, 陈文兴()   

  1. 浙江理工大学 纺织纤维材料与加工技术国家地方联合工程实验室, 浙江 杭州 310018
  • 收稿日期:2021-05-24 修回日期:2021-11-17 出版日期:2022-07-15 发布日期:2022-07-29
  • 通讯作者: 陈文兴
  • 作者简介:林启松(1993—),男,博士生。主要研究方向为聚酯纤维。
  • 基金资助:
    浙江省重点研发计划项目(2021C01020)

Thickening behaviour and performance of titanium-based polyethylene terephthalate

LIN Qisong, GAO Feng, LÜ Wangyang, CHEN Wenxing()   

  1. National Engineering Laboratory for Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2021-05-24 Revised:2021-11-17 Published:2022-07-15 Online:2022-07-29
  • Contact: CHEN Wenxing

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摘要：

为了拓宽钛系聚对苯二甲酸乙二醇酯(PET)在聚酯工业丝领域的应用,通过超高效聚合物色谱-多角度激光光散射联用法研究其在不同温度下的增黏行为,建立增黏温度与钛系PET分子质量及其分布的关系,并利用紫外-可见分光光度计和差示扫描量热仪研究增黏PET的色相和热性能。结果表明:钛系PET分子质量随增黏温度的升高而升高,且色相受温度影响明显;增黏所需时间随温度升高而下降,270 ℃反应20 min的钛系PET重均分子量与220 ℃反应10 h时的相当,分子质量升高导致聚酯结晶性能和熔点下降;增黏温度超过熔点后,分子质量分布随温度升高而变窄,且分子质量可达到聚酯工业丝要求,高分子质量窄分布钛系聚酯的研究对其在工业丝领域的应用具有重要意义。

关键词: 聚酯工业丝, 钛催化剂, 熔融缩聚, 增黏行为

Abstract:

To extend the application of titanium-based polyethylene terephthalate (PET) in the manufacturing industrial polyester yarns, advanced polymer chromatography together with multi-angle laser light scattering was employed to research the thickening behaviour under various temperatures. A relationship between polycondensation temperature and molecular weight and its distribution of titanium-based PET were established. UV-Vis spectrophotometer and differential scanning calorimeter were used to study PET coloration with its thermal properties. The results indicate that molecular weight of the titanium-based PET increases as the polycondensation temperatures increase, and its coloration is obviously affected by the temperature. The required time for viscosity increasing decreases as the temperatures rise. The weight-average molecular weight for titanium-based PET obtained at 270 ℃ for 20 min reaction time is similar to that obtained at 220 ℃ for 10 h reaction time. It is shown that the elevated molecular weight leads to a decrease of PET crystalline performance and melt temperature. The molecular weight distribution becomes narrower when polycondensation temperature exceeds the melting temperature, and the molecular weight meets the requirements for industrial polyester yarns. The study on high molecular weight with narrow molecular weight distribution provides useful reference for making industrial polyester yarns.

Key words: industrial polyester yarn, titanium catalyst, melt polycondensation, thickening behaviour

中图分类号: 

  • TS15

图1

不同温度下钛系PET增黏后紫外-可见吸收谱图"

图2

220和270 ℃增黏时钛系PET在410 nm处吸光度随时间的变化"

表1

不同增黏工艺的钛系PET的分子质量相关参数及特性黏度"

反应温度/℃ 特性黏度/(dL·g-1) 黏均分子量/(g·mol-1) 数均分子量/(g·mol-1) 重均分子量/(g·mol-1) 多分散指数
原样 0.676 18 960 22 780 36 970 1.623
210 0.791 22 960 26 780 44 500 1.661
220 0.880 26 150 31 510 51 680 1.640
230 0.959 29 040 42 460 66 280 1.599
240 0.986 30 020 38 090 69 890 1.835
250 1.002 30 610 45 110 78 650 1.743
260 1.104 34 470 35 530 66 030 1.859
270 1.054 32 560 39 590 68 090 1.720
280 1.080 33 560 44 890 68 830 1.533

图3

220和270 ℃钛系PET重均分子量随增黏时间的变化"

图4

270 ℃时不同增黏时间的钛系PET分子质量分布曲线"

表2

270 ℃增黏后钛系PET的分子质量相关参数及特性黏度"

反应时间/min 特性黏度/(dL·g-1) 黏均分子量/(g·mol-1) 数均分子量/(g·mol-1) 重均分子量/(g·mol-1) 多分散指数
0 0.676 18 960 22 780 36 970 1.623
20 0.902 26 930 31 760 53 770 1.693
60 1.054 32 560 39 590 68 090 1.720
100 1.176 37 240 42 300 72 140 1.705
140 1.257 40 390 45 820 81 990 1.789

图5

不同温度下固相缩聚10 h和液相增黏60 min后钛系PET的DSC曲线"

图6

270 ℃液相增黏不同时间后钛系PET的DSC曲线"

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