Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (08): 95-100.doi: 10.13475/j.fzxb.20210309107

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Degumming of hemp fibers using Fenton method and fiber properties

SUN Ying1,2(), LI Duanxin1, YU Yang1, CHEN Jialin1, FAN Wanyue1   

  1. 1. College of Light Industry and Textile, Qiqihar University, Qiqihar, Heilongjiang 161000, China
    2. Engineering Research Center for Hemp and Product in Cold Region of Ministry of Education, Qiqihar University, Qiqihar, Heilongjiang 161000, China
  • Received:2021-03-29 Revised:2022-04-30 Online:2022-08-15 Published:2022-08-24

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Abstract:

In order to reduce the environmental pollution caused by the strong alkalinity in the degumming waste liquid in the textile industry, the Fenton method was used to degum the hemp skin fiber. Using residual gum rate, breaking strength, diameter, whiteness and fiber length as indicators, the effects of pH value, ferrous sulfate concentration, hydrogen peroxide concentration and temperature on the effect of hemp degumming process were discussed. The chemical structure and crystallinity changes of hemp fibers were analyzed by infrared spectrometer and X-ray diffraction analyzer, and the degumming effect of hemp fibers was examined by scanning electron microscope. The test results show that the optimum degumming process conditions are pH 6.0, ferrous sulfate mass concentration 10 g/L, hydrogen peroxide mass concentration 9 g/L, and temperature 80 ℃. Under the optimal process, the residual glue rate of the degummed fibers was 10.12％, the breaking strength was 32.453 cN, the fiber diameter was 29.745 μm, and the fiber length was 5.62 cm. It was found that Fenton method can effectively remove the gum of hemp fiber.

Key words: hemp fiber, Fenton method, degumming, pretreatment, mechanical property

CLC Number: 

  • TS102.224

Tab.1

Performance of degummed hemp fibers under different pH values"

pH值 断裂强力/cN 残胶率/％ 直径/μm 白度/％ 长度/cm
3 49.68 ± 1.50 19.75 ± 0.10 25.97 ± 0.4 22.55 ± 0.1 5.84 ± 0.02
5 53.50 ± 1.00 16.15 ± 0.51 30.54 ± 0.7 29.65 ± 0.5 5.79 ± 0.01
7 41.92 ± 1.50 20.70 ± 0.25 39.86 ± 0.2 43.57 ± 0.2 5.81 ± 0.02
9 27.97 ± 1.75 22.22 ± 0.27 36.31 ± 0.3 29.74 ± 0.3 5.72 ± 0.02
12 10.27 ± 0.45 20.32 ± 0.25 40.77 ± 0.5 60.19 ± 0.5 5.69 ± 0.03

Tab.2

Performance of degummed hemp fibers under different FeSO4·7H2O concentrations"

FeSO4·7H2O
质量浓度/(g·L–1)		 断裂强力/cN 残胶率/％ 直径/μm 白度/％ 长度/cm
3 53.50 ± 1.0 14.15 ± 0.1 35.44 ± 0.5 29.65 ± 0.1 5.64 ± 0.02
5 34.29 ± 0.5 16.26 ± 0.2 27.85 ± 0.7 45.93 ± 0.5 5.72 ± 0.01
7 31.47 ± 0.5 14.43 ± 0.1 21.32 ± 0.6 29.10 ± 0.2 5.57 ± 0.02
10 42.14 ± 0.7 14.46 ± 0.1 15.68 ± 0.3 23.83 ± 0.3 5.76 ± 0.02
15 11.36 ± 0.6 13.71 ± 0.1 30.75 ± 0.2 31.35 ± 0.5 5.84 ± 0.01

Tab.3

Performance of degummed hemp fibers under different H2O2 concentrations"

H2O2质量
浓度/(g·L–1)		 断裂强力/cN 残胶率/％ 直径/μm 白度/％ 长度/cm
4 31.97 ± 1.00 14.43 ± 0.10 36.97 ± 0.2 45.92 ± 0.5 5.81 ± 0.02
6 31.02 ± 1.00 12.79 ± 0.20 30.70 ± 0.3 32.83 ± 0.5 5.72 ± 0.01
8 45.00 ± 0.75 10.68 ± 0.20 28.15 ± 0.2 35.12 ± 0.2 5.64 ± 0.02
10 19.53 ± 1.00 11.65 ± 0.30 27.03 ± 0.9 36.47 ± 0.7 5.52 ± 0.20
15 35.54 ± 1.00 10.46 ± 0.25 18.99 ± 0.5 45.88 ± 0.5 5.41 ± 0.30

Tab.4

Performance of degummed hemp fibers under different temperatures"

温度/℃ 断裂强力/cN 残胶率/％ 直径/μm 白度/％ 长度/cm
50 59.35 ± 1.00 13.45 ± 0.10 24.67 ± 0.2 25.84 ± 0.5 5.74 ± 0.02
60 45.00 ± 1.00 10.68 ± 0.20 21.05 ± 0.3 26.47 ± 0.5 5.81 ± 0.01
70 46.09 ± 0.75 11.51 ± 0.20 18.94 ± 0.2 22.56 ± 0.2 5.79 ± 0.02
80 48.09 ± 0.75 12.33 ± 0.30 19.95 ± 0.9 29.21 ± 0.1 5.83 ± 0.02
90 29.29 ± 1.00 10.98 ± 0.25 16.34 ± 0.5 23.22 ± 0.5 5.71 ± 0.03

Tab.5

Performance of degummed hemp fibers under different time"

时间/min 断裂强力/cN 残胶率/％ 直径/μm 白度/％ 长度/cm
30 42.37 ± 1.00 21.37 ± 2.0 27.48 ± 0.2 37.49 ± 0.3 5.92 ± 0.04
45 27.65 ± 2.00 16.94 ± 1.0 22.34 ± 0.3 30.21 ± 0.1 5.83 ± 0.09
60 21.43 ± 1.00 10.42 ± 1.0 16.13 ± 0.1 23.64 ± 0.2 5.74 ± 0.02
75 14.53 ± 0.75 9.73 ± 0.9 14.91 ± 0.1 21.82 ± 0.1 5.71 ± 0.02
90 9.67 ± 0.50 8.94 ± 0.3 12.75 ± 0.2 20.13 ± 0.3 5.54 ± 0.03

Tab.6

Table of factors and levels of orthogonal test on degumming of hemp fibers"

水平 A
pH值		 B
FeSO4·7H2O
质量浓度/
(g·L–1)		 C
H2O2
质量浓度/
(g·L–1)		 D
温度/℃
1 4 8 7 60
2 5 9 8 70
3 6 10 9 80

Tab.7

Orthogonal test data of hemp fibers degumming"

编号 A B C D E 残胶
率/％		 断裂强
力/cN		 直径/
μm		 纤维长
度/cm
1 1 1 1 1 1 11.29 37.00 50.41 5.72
2 1 2 2 2 2 19.48 36.96 56.78 5.46
3 1 3 3 3 3 13.42 15.39 41.53 5.65
4 2 1 1 2 2 11.83 47.75 51.95 5.73
5 2 2 2 3 3 9.36 40.74 58.06 5.56
6 2 3 3 1 1 8.13 46.88 43.49 5.47
7 3 1 2 1 3 10.08 67.49 20.17 5.67
8 3 2 3 2 1 8.68 45.14 24.56 5.33
9 3 3 1 3 2 12.70 25.04 19.37 5.42
10 1 1 3 3 2 11.68 17.13 30.75 5.64
11 1 2 1 1 3 10.99 30.60 29.53 5.73
12 1 3 2 2 1 16.69 24.01 35.44 5.54
13 2 1 2 3 1 12.13 27.31 30.05 5.72
14 2 2 3 1 2 16.76 24.02 21.19 5.42
15 2 3 1 2 3 11.27 20.50 19.04 5.39
16 3 1 3 2 3 11.82 10.54 16.30 5.63
17 3 2 1 3 1 9.03 23.07 17.49 5.73
18 3 3 2 1 2 11.59 12.65 23.96 5.61

Tab.8

Table of range analysis of orthogonal test data of hemp fiber degumming"

指标 A B C D
K1 13.925 11.472 11.185 11.473
残胶率 K2 11.580 12.383 13.222 13.295
K3 10.650 12.300 11.748 11.387
R 3.275 0.911 2.037 1.908
K1 26.843 34.537 30.660 34.773
断裂强力 K2 34.533 33.422 34.860 30.817
K3 30.655 24.078 26.517 24.780
R 7.690 10.459 8.343 9.993
K1 40.740 33.272 31.298 31.458
直径 K2 37.297 34.602 37.410 34.012
K3 20.308 27.472 29.637 32.875
R 20.432 10.130 7.773 2.554
K1 5.623 5.685 5.62 5.603
长度 K2 5.548 5.538 5.593 5.513
K3 5.565 5.513 5.523 5.620
R 0.075 0.172 0.097 0.107

Tab.9

Properties and content of each component of hemp fiber before and after degumming treatment"

样品名称 残胶
率/％		 断裂强
力/cN		 直径/
μm		 长度/
cm		 纤维素
含量/％		 木质素
含量/％		 半纤维素
含量/％		 果胶含
量/％		 其他含
量/％
大麻原麻 — 100.030 120.457 6.00 49.63 18.98 19.32 6.79 5.28
处理后大麻 10.12 32.453 29.745 5.62 79.14 9.49 9.06 1.21 1.10

Fig.1

Infrared spectra of hemp fiber before and after degumming treatment"

Fig.2

XRD patterns of hemp fiber before and after degumming treatment"

Fig.3

SEM images of hemp fiber before(a)and after (b)degumming treatment (×2 000)"

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