Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (04): 48-54.doi: 10.13475/j.fzxb.20200706307

• Fiber Materials • Previous Articles     Next Articles

Preparation and performance of super absorbent modified cotton fiber membrane

XIE Wanting1, LIU Qihai1,2,3(), JIA Zhenyu1,2,3, ZHU Xiaohua3, WANG Ronghui3   

  1. 1. College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, China
    2. Guangdong Weiqian Technology Co., Ltd., Foshan, Guangdong 528216, China
    3. Zhanjiang Botai Bio-Chemical Technology Industrial Co., Ltd., Zhanjiang, Guangdong 524051, China
  • Received:2020-07-24 Revised:2021-01-02 Online:2021-04-15 Published:2021-04-20
  • Contact: LIU Qihai E-mail:lqh2003@163.com

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Abstract:

In order to prepare super absorbent fiber membranes with higher water absorption and stability, the cotton fibers alkalized by NaOH were modified by the chloroacetic acid to enhance the water absorbence, and then the water-absorbent fibers were dispersed in water to prepare a super absorbent fiber membrane material. The surface structure, chemical structure, crystalline structure, thermal stability, the degree of carboxymethyl substitution, water absorption and mechanical properties of the fiber membrane material were eveluated and analyzed. The results show that alkali treatment to cotton fiber can promote the substitution reaction between chloroacetic acid and cotton fiber, and the amount of chloroacetic acid directly affects the degree of carboxymethyl substitution of cotton fiber, which has an important impact on the improvement in water absorption performance of the membrane. However, too high a dosage will significantly reduce the tensile strength of the fiber membrane. When the degree of carboxymethyl substitution is about 0.264, the shape of the absorbent fiber membrane material remains relatively complete after absorbing water, and has generally good mechanical properties, and its water absorption rate can reach 163.3 times, with the water retention rate reaching more than 73.7 times.

Key words: super absorbent fiber membrane, chloroacetic acid, hydrophilic modification, water-absorbent material, degree of carboxymethyl substitution, cotton fiber

CLC Number: 

  • TS102.6

Fig.1

Schematic diagram of preparation route of super absorbent fiber membrane"

Fig.2

Physical image of super absorbent fiber membrane before and after water absorption. (a) Shape before water absorption; (b)Shape after water absorption; (c) Suspended state after water absorption"

Fig.3

SEM images of cotton and super absorbent fiber membranes before and after modification (×2 000). (a)Unmodified cotton fiber; (b) Modified cotton fiber;(c) Fiber membrane treated by 15% NaOH;(d) Fiber membrane treated by 20% NaOH"

Fig.4

Infrared spectra of super absorbent fiber membranes treated by different mass fractions of NaOH"

Fig.5

Thermal stability curves of super absorbent fiber membranes treated by different mass fractions of NaOH"

Tab.1

Thermal weight loss data of super absorbent fiber membranes treated by different mass fractions of NaOH"

NaOH质量
分数/%		 初始质量损失
温度/℃		 第2阶段质量
损失温度/℃		 第2阶段质量
损失率/%		 总质量
损失率/%
0 35~70 332~371 67.6 99.7
15 35~70 257~316 42.9 71.4
18 35~75 252~332 46.3 68.5
20 — 248~320 37.7 61.9

Fig.6

XRD spectrum of super absorbent fiber membranes treated by different mass fractions of NaOH"

Tab.2

Effect of different mass fraction of NaOH on performance of super absorbent fiber membranes"

NaOH质量
分数/%		 羧甲基
取代度		 吸水倍率 保水倍率 断裂强度/
MPa		 断裂伸长
率/%
10 0.065 46.2 35.9 — —
15 0.168 81.8 48.0 1.21 20.51
18 0.203 115.9 54.3 6.70 28.56
20 0.265 146.7 67.3 10.44 36.54
25 0.268 43.3 35.0 2.41 20.59

Tab.3

Effect of different dosage of chloroacetic acid on performance of super absorbent fiber membranes"

氯乙酸和棉纤
维质量比		 羧甲基
取代度		 吸水倍率 保水倍率 断裂强
度/MPa		 断裂伸长
率/%
0.5∶1 0.157 58.7 34.9 — —
1.0∶1 0.225 82.7 50.4 3.77 5.23
1.5∶1 0.238 125.6 60.0 4.46 39.09
2.0∶1 0.198 109.8 43.4 6.94 28.50
2.5∶1 0.191 81.8 38.0 1.21 6.53

Tab.4

Effects of different reaction temperatures on performance of super absorbent fiber membranes"

反应温
度/℃		 羧甲基
取代度		 吸水倍率 保水倍率 断裂强
度/MPa		 断裂伸长
率/%
55 0.172 70.6 31.3 1.21 26.50
60 0.211 109.8 44.3 3.12 28.51
65 0.248 114.5 63.3 3.61 36.00
70 0.232 88.5 57.1 2.16 27.50
75 0.225 73.0 51.8 2.14 24.00
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