Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (07): 93-101.doi: 10.13475/j.fzxb.20190501408

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Scouring and bleaching process for flax roves using supercritical CO2

ZHANG Juan1,2, ZHENG Huanda2, QIAO Yan1, GAO Shihui1,2, ZHENG Laijiu2()   

  1. 1. Liaoning Vocational College of Light Industry, Dalian, Liaoning 116100, China
    2. Liaoning Provincial Key Laboratory of Supercritical CO2 Waterless Dyeing, Dalian Polytechnic University, Dalian, Liaoning 116034, China
  • Received:2019-05-08 Revised:2020-02-26 Online:2020-07-15 Published:2020-07-24
  • Contact: ZHENG Laijiu E-mail:fztrxw@dlpu.edu.cn

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Abstract:

In order to solve the problem of high water consumption and environmental pollution in conventional scouring and bleaching process of flax roves, scouring and bleaching technology for flax roves using supercritical CO2 as the medium instead of water was proposed. The effects of mass fraction of compound biological enzymes (xylanase and cellulase), temperature, pressure and time on the whiteness of flax roves were systematically studied using supercritical CO2, and the process conditions of scouring and bleaching were optimized by responsive surface analysis. The influence of the independent variables and their interaction on the whiteness was investigated using Box-Benhnken center composite design and responsive surface method, and the prediction model in a form of quadratic polynomial regression equation was obtained. An optimized process for scouring and bleaching of flax roves was recommended with a mass fraction of compound biological enzymes of 3%, a temperature of 50 ℃, a pressure of 13 MPa as well as a treatment time of 60 min in supercritical CO2. Moreover, under the optimum technical conditions, the properties of scoured and bleached roves under the supercritical CO2 condition were compared with that of original sample. The whiteness, the residual gum content, the breaking strength, the elongation at break and the split degree of the flax roves are 40.8%, 16.68%, 17.12 cN/tex, 4.23% and 1 072 Nm, respectively. However, there is still a certain gap in comparison with the traditional method, which needs to be further improved.

Key words: flax roves, scouring, bleaching, pre-treatment, supercritical CO2, responsive surface optimization, whiteness

CLC Number: 

  • TS192.552

Tab.1

Factors and levers of response surface test"

水平 因素
生物酶
质量分数x1/%		 温度x2/
℃		 压力x3/
MPa		 时间x4/
min
-1 1 40 10 30
0 2 50 15 60
1 3 60 20 90

Fig.1

Effect of added water on activities of compound biological enzymes and whiteness of flax rove"

Tab.2

Design and result of response surface analysis"

序号 x1 x2 x3 x4 Y/%
1 -1 0 -1 0 37.1
2 0 0 1 1 39.5
3 0 0 0 0 41.5
4 0 0 1 -1 38.3
5 0 1 1 0 37.7
6 0 1 0 1 37.1
7 0 0 0 0 39.7
8 0 -1 1 0 36.4
9 -1 0 0 1 38.6
10 -1 1 0 0 35.9
11 0 1 0 -1 36.3
12 -1 0 0 -1 35.5
13 0 0 -1 -1 36.7
14 0 -1 0 -1 33.6
15 1 -1 0 0 35.8
16 0 0 -1 1 37.5
17 1 0 -1 0 39.4
18 -1 -1 0 0 30.1
19 0 -1 0 1 33.4
20 -1 0 1 0 36.9
21 1 1 0 0 37.2
22 0 0 0 0 39.8
23 0 0 0 0 39.5
24 1 0 0 1 40.8
25 0 0 0 0 41.4
26 0 -1 -1 0 29.6
27 1 0 0 -1 40.8
28 0 1 -1 0 37.6
29 1 0 1 0 41.2

Tab.3

Variance analysis of quadratic regression model"

方差
来源		 平方和 自由度 均方 F值 P值 显著性
模型 241.00 14 17.21 20.44 < 0.000 1 ***
x1 37.10 1 37.10 44.05 < 0.000 1 ***
x2 43.70 1 43.70 51.89 < 0.000 1 ***
x3 12.20 1 12.20 14.49 0.001 9 **
x4 2.71 1 2.71 3.21 0.094 6
x12 4.35 1 4.35 5.17 0.039 3 **
x22 125.25 1 125.25 148.71 < 0.000 1 ***
x32 6.41 1 6.41 7.61 0.015 4 *
x42 6.09 1 6.09 7.23 0.017 6 *
x1x2 4.84 1 4.84 5.75 0.031 0 *
x1x3 1.00 1 1.00 1.19 0.294 3
x1x4 2.40 1 2.40 2.85 0.113 4
x2x3 11.22 1 11.22 13.32 0.002 6 **
x2x4 0.25 1 0.25 0.30 0.594 5
x3x4 0.04 1 0.04 0.047 0.830 6
剩余 11.79 14 0.84
失拟 7.92 10 0.79 0.82 0.638 3
误差 3.87 4 0.97
总和 252.79 28
R2 0.953 4
调整R2 0.906 7

Fig.2

Responsive surfaces of Y=f(x1,x2). (a)Response surface curve of interaction of x1 and x2 on Y; (b)Contour map of interaction of x1 and x2 on Y"

Fig.3

Responsive surfaces of Y=f(x2, x3). (a)Response surface curve of interaction of x2 and x3 on Y;(b)Contour map of interaction of x2 and x3 on Y"

Fig.4

Responsive surfaces of Y=f(x2, x4)"

Fig.5

Effect of mass fraction of compound biological enzymes on whiteness of flax rove"

Tab.4

Properties of flax rove with different scouring and bleaching method"

煮漂
方法		 白度/
%		 残胶率/
%		 断裂强度/
(cN·tex-1)		 断裂
伸长率/%		 分裂度/
Nm
超临界CO2+
复配生物酶		 40.8 16.68 17.12 4.23 1 072
传统方法 68.6 15.92 16.93 3.95 1 249
原样 15.5 21.76 16.28 2.04 575
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