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Open AccessArticle

Protective Bleaching of Camel Hair in a Neutral Ethanol–Water System

by Liangjun Xia 1,2,†, Chunhua Zhang 1,†, Wenfang Xu 1, Kundi Zhu 1, Aming Wang 1, Ye Tian 3, Yunli Wang 1,4,5,* and Weilin Xu 1,*
1
State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China
2
Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216, Australia
3
Guangdong Esquel Textiles Co., Ltd., Esquel Group, Foshan 528500, China
4
College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, China
5
Hubei Biomass Fibers and Eco-Dyeing & Finishing Key Laboratory, Wuhan Textile University, Wuhan 430200, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Polymers 2018, 10(7), 730; https://doi.org/10.3390/polym10070730
Received: 5 June 2018 / Revised: 28 June 2018 / Accepted: 30 June 2018 / Published: 3 July 2018
(This article belongs to the Special Issue Polymer Processing for Enhancing Textile Application)
As conventional bleaching under alkaline conditions is chemically damaging to protein fibers, a three-stage protective bleaching process in neutral ethanol–water mixtures was proposed for camel hair using mordanting with ferrous salts, oxidative bleaching with hydrogen peroxide, and reductive bleaching with sodium hydrosulfite. The aim of this work was to improve the whiteness degree of camel hair without substantial tenacity loss. In addition, the roles of ethanol during the bleaching treatment were also examined by characterizing the fibers using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction. The whiteness degree and mechanical properties of camel hair bleached in the neutral ethanol–water system were significantly superior to those of fibers bleached by a conventional method. SEM images showed no visible cracks on the scales of fibers bleached in the ethanol–water system, whereas large grooves were observed on fibers bleached in aqueous solution. TEM images confirmed the positive influence of ethanol on the mordanting process, and FTIR spectra suggested that ethanol reduced the breakage of hydrogen bonds in the fibers during the oxidative bleaching process. These findings indicate the potential of this protective bleaching method for application to a broad range of other natural protein fibers. View Full-Text
Keywords: camel hair; natural fiber; bleaching; ethanol–water mixture; whiteness; mechanical properties camel hair; natural fiber; bleaching; ethanol–water mixture; whiteness; mechanical properties
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MDPI and ACS Style

Xia, L.; Zhang, C.; Xu, W.; Zhu, K.; Wang, A.; Tian, Y.; Wang, Y.; Xu, W. Protective Bleaching of Camel Hair in a Neutral Ethanol–Water System. Polymers 2018, 10, 730.

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