Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (07): 1-8.doi: 10.13475/j.fzxb.20220307508

• Invited Paper •     Next Articles

Rapid separation and content determination of fibers from waste cotton/polyester blended fabrics

ZHANG Xiaocheng1, ZHOU Yan1,2, TIAN Weiguo1, QIAO Xin1, JIA Fengwei3, XU Lili3, ZHANG Jinming1, ZHANG Jun1,2()   

  1. 1. Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    2. College of Chemistry, University of Chinese Academy of Sciences, Beijing 100049, China
    3. Shandong Zhongke Henglian Biobased Materials Co., Ltd., Weifang, Shandong 261106, China
  • Received:2022-03-21 Revised:2022-04-19 Online:2022-07-15 Published:2022-07-29
  • Contact: ZHANG Jun E-mail:jzhang@iccas.ac.cn

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Abstract:

Based on ionic liquid/co-solvent system with excellent dissolving capability for cellulose and relatively low viscosity, a method for rapid component separation and content determination for waste cotton/polyester blended fabrics was proposed. The effect of ionic liquid and co-solvent on the dissolving capability, solution viscosity, structure and properties of separated components was studied. The results indicate that the 1-butyl-3-methylimidazolium acetate/dimethyl sulfoxide (the mass ratio is 1:1) system can selectively dissolve cellulose in the cotton/polyester blended fabrics, and the resultant cellulose solution has a low viscosity. Subsequently, after a simple filtration, cellulose and polyester fibers can be completely separated under simple and mild conditions, with the separation temperature to be 25-60 ℃. The cellulose component is almost non-degradable, and can be processed into film, fibers and microspheres. The polyester component with a high purity can also be separated and keep its original textile morphology in blended fabrics. In summary, the ionic liquid/co-solvent method not only can high-efficiently separate the components of the cotton/polyester blended fabrics, but also can accurately measure the components content. Therefore, this work provides a promising and useful method to the recycling and re-utilization of waste textiles, indicating a great potential in the practical applications.

Key words: waste textiles, cotton/polyester blended fabric, ionic liquid, co-solvent, cellulose

CLC Number: 

  • O636.1

Fig.1

Photos of cloth. (a) Waste cotton/polyester blended fabrics jacket; (b) Fabric sample before and after decolorization treatment"

Fig.2

Schematic diagram of dissolving cotton/polyester fabric in BmimAc (a) and BmimAc/DMSO (b) co-solvent system"

Fig.3

Photos of cotton/polyester fabric before and after removal of cellulose with BmimAc/DMSO"

Fig.4

Viscosity curves of different ionic liquids, ionic liquids/co-solvents and related cellulose solutions. (a) Viscosity curves of different ionic liquids, ionic liquids/co-solvents and related cellulose solutions; (b) Viscosity curves of cotton/polyester textiles dissolved in AmimCl and BmimAc/DMSO"

Fig.5

Dissolution process of cotton/polyester fabric in AmimCl/DMSO(1:1) and BmimAc/DMSO(1:1)"

Fig.6

Dissolving capability of BmimAc/DMSO with different blending mass ratios"

Fig.7

Degree of polymerization of cellulose before and after BmimAc/DMSO dissolution separation of cotton/polyester blended fabrics"

Fig.8

Characterization of cotton and PET components before and after separation. (a) FT-IR spectra of cotton/polyester blended fabrics before and after decolorization; (b) FT-IR spectra of PET and separated PET; (c) DSC curves of PET and separated PET; (d) TGA curves of PET and separated PET"

Tab.1

Content determination result after rapid separation and recovery of cotton/polyester blended fabrics%"

混纺织物棉和涤组分
含量标签值		 混纺织物棉和涤组分含量
新方法测定值
棉 涤纶 棉 涤纶
55 45 54.5 45.3
70 30 69.4 30.0
89 11 88.6 11.0
100 0 99.6 —

Fig.9

Schematic diagram of dissolving and separating cotton/polyester fabrics with BmimAc/DMSO system"

Fig.10

Photos of cotton and polyester components after separation. (a) Regenerated cellulose membrane; (b) Regenerated cellulose fibers; (c) Separated polyester fibric; (d) Separated polyester fabric microstructure"

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