Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (10): 27-33.doi: 10.13475/j.fzxb.20201201207

• Fiber Materials • Previous Articles     Next Articles

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 Online:2021-10-15 Published:2021-10-29
  • Contact: LI Junrong E-mail:lljrr@scut.edu.cn

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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

CLC Number: 

  • TS151

Fig.1

Dissolution process of DPFJ in NMMO.(a) Initial stage;(b) Suspension stage;(c) Swelling stage;(d) Dissolution stage"

Fig.2

Dynamic dissolution diagram of four dissolving pulps in NMMO"

Tab.1

Main chemical composition and degree of polymerization of four dissolving pulps"

样品 α-纤维
素含
量/%		 聚合
度		 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

Fig.3

X-ray diffraction patterns of four dissolving pulps"

Fig.4

LSCM images of four dissolving pulps"

Tab.2

Morphological parameters of four dissolving pulp fibers"

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

Fig.5

Fiber length distribution in four dissolving pulps"

Fig.6

SEM images of fiber morphology of four dissolving pulps(×300)"

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