纺织学报 ›› 2021, Vol. 42 ›› Issue (10): 27-33.doi: 10.13475/j.fzxb.20201201207

• 纤维材料 • 上一篇    下一篇

Lyocell纤维纺丝浆粕溶解性的影响因素分析

潘忆乐1, 钱丽颖1, 徐纪刚2, 何北海1, 李军荣1()   

  1. 1.华南理工大学 轻工科学与工程学院, 广东 广州 510640
    2.中国纺织科学研究院有限公司生物源纤维制造技术国家重点实验室, 北京 100025
  • 收稿日期:2020-12-07 修回日期:2021-06-05 出版日期:2021-10-15 发布日期:2021-10-29
  • 通讯作者: 李军荣
  • 作者简介:潘忆乐(1996—),男,硕士生。主要研究方向为Lyocell纤维溶解浆粕的制备和性能优化。
  • 基金资助:
    国家重点研发计划项目(2017YFB0309501)

Analysis on factors influencing solution of Lyocell fiber spinning pulp

PAN Yile1, QIAN Liying1, XU Jigang2, HE Beihai1, LI Junrong1()   

  1. 1. School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
    2. State Key Laboratory of Biobased Fiber Manufacturing Technology, China Textile Academy, Beijing 100025, China
  • Received:2020-12-07 Revised:2021-06-05 Published:2021-10-15 Online:2021-10-29
  • Contact: LI Junrong

摘要:

为探究Lyocell纤维纺丝浆粕溶解性的影响因素,对4种不同的溶解浆进行分析,研究了其化学组分、结晶度、聚合度以及纤维形态对溶解浆在N-甲基吗啉-N-氧化物(NMMO)中溶解性的影响。结果表明:浆粕的溶解主要历经悬浮阶段、溶胀阶段和溶解阶段;溶胀阶段纤维发生非均匀溶胀的比例越高,溶解的时间越长;当浆粕质量符合制备Lyocell纤维的原料标准时,纤维表面的微量木质素对浆粕溶解起主要作用;木质素通过吸附作用沉积在纤维表面,与纤维素通过氢键结合减弱纤维溶胀,同时疏水性的木质素会阻碍NMMO向纤维内部渗透,增加溶解时间。

关键词: Lyocell纤维, 溶解性, N-甲基吗啉-N-氧化物, 浆粕组分, 木质素分布

Abstract:

In order to explore the factors affecting the solubility of Lyocell fiber spinning pulp, four different dissolving pulps were analyzed to study the influence of their chemical composition, crystallinity, degree of polymerization and fiber morphology on the solubility of dissolving pulp in N-methylmorpholine-N-oxide (NMMO). The results showed that the dissolution of pulp experienced the suspension stage, swelling stage and dissolution stage. The higher the proportion of non-uniform swelling of fibers in the swelling stage, the longer the dissolution time. When the pulp quality meets the raw material standard for preparing Lyocell fiber, the trace lignin on the fiber surface plays a major role in dissolving the pulp. Lignin is deposited on the surface of the fiber through adsorption, and is combined with cellulose through hydrogen bonds to weaken fiber swelling. At the same time, hydrophobic lignin hindered the penetration of NMMO into the fiber and increased the dissolution time.

Key words: Lyocell fiber, solubility, N-methylmorpholine-N-oxide, pulp composition, lignin distribution

中图分类号: 

  • TS151

图1

DPFJ在NMMO中的溶解过程"

图2

4种溶解浆在NMMO中动态溶解图"

表1

4种溶解浆的主要化学组成及聚合度"

样品 α-纤维
素含
量/%
聚合
结晶
度/%
灰分含
量/%
铁离子质
量浓度/
(mg·kg-1)
白度/
%
DPMG 93.63 671 82.37 0.12 2.62 93.63
DPFJ 93.02 667 82.49 0.16 11.87 88.21
DPADL 93.03 737 83.56 0.06 3.82 92.07
DPRD 92.37 662 80.32 0.07 3.11 91.78

图3

4种溶解浆的X射线衍射图"

图4

4种溶解浆的LSCM图像"

表2

4种溶解浆的纤维形态参数"

样品 重均长
度/mm
长宽比 粗度/
(mg·m-1)
细小纤维
含量/%
弯曲指
数/%
DPMG 1.34 51.98 0.14 5.12 23.01
DPFJ 1.99 70.25 0.14 2.13 14.93
DPADL 1.37 53.22 0.19 7.86 21.34
DPRD 1.39 55.06 0.13 3.54 24.52

图5

4种溶解浆内纤维长度分布"

图6

4种溶解浆的纤维形貌扫描电镜照片(×300)"

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