Reductive total chlorine free photochemical bleaching of cellulosic fabrics, an energy conserving process

Akihiko Ouchi; Toru Obata; Takeshi Oishi; Hitoshi Sakai; Teruyuki Hayashi; Wataru Ando; Jun Ito

doi:10.1039/B315580C

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Reductive total chlorine free photochemical bleaching of cellulosic fabrics, an energy conserving process†

Akihiko Ouchi,*^a Toru Obata,^a Takeshi Oishi,^a Hitoshi Sakai,^a Teruyuki Hayashi,^a Wataru Ando^a and Jun Ito^b

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* Corresponding authors

^a Research Institute for Green Technology, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
E-mail: ouchi.akihiko@aist.go.jp

^b Textile Research & Development Center, Nisshinbo Industries, Inc., Miai, Okazaki, Aichi 444-8510, Japan

Abstract

Water-insoluble natural colored compounds adsorbed or chemically bound on cellulosic fabrics were bleached effectively at room temperature by a selective photolysis of the colored compounds using various excimer lasers (ArF, KrF, XeCl, XeF), a low-pressure mercury lamp, and a black-light fluorescent lamp in the presence of aqueous solutions of various reducing reagents. Sodium borohydride gave the best efficiency on the bleaching when KrF, XeCl, XeF excimer lasers or a low-pressure mercury lamp were used as light sources and the efficiency of the bleaching was found to be comparable to that of the conventional thermal bleaching processes.

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Supplementary files

UV absorption spectrum of the aqueous solutions of NaBH₄, Na₂S₂O₄, NaHSO₃, Na₂SO₃, H₂NC(=NH)SO₂H, and HOCH₂SO₂Na. The results on the whiteness and the yellow index of KrF laser bleached cotton fabrics using EtOH solutions of various silyl hydride reagents [(MeO)₃SiH, (EtO)₃SiH, n-Bu₃SiH, n-C₈H₁₇SiH₃, (HMe₂Si)₂O, (HMe₂SiO)₄Si, Me₃SiO(HMeSiO)₂₀SiMe₃, (MeO)₃Si(CH₂)₃NH₂, SM8707, SRX310]. Additive effects of amines and ammonium salts in the KrF laser bleaching using an aqueous solution of NaBH₄. The KrF laser bleaching in alcohol–, amine–, ammonium salt–, and amide–H₂O mixtures. Emission spectra of the low-pressure mercury lamp and the black-light fluorescence lamp. PDF (217K)

Article information

DOI: https://doi.org/10.1039/B315580C
Article type: Paper
Submitted: 01 Dec 2003
Accepted: 11 Feb 2004
First published: 05 Mar 2004

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Green Chem., 2004,6, 198-205

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Reductive total chlorine free photochemical bleaching of cellulosic fabrics, an energy conserving process

A. Ouchi, T. Obata, T. Oishi, H. Sakai, T. Hayashi, W. Ando and J. Ito, Green Chem., 2004, 6, 198 DOI: 10.1039/B315580C

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Green Chemistry

Reductive total chlorine free photochemical bleaching of cellulosic fabrics, an energy conserving process†

Abstract

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Reductive total chlorine free photochemical bleaching of cellulosic fabrics, an energy conserving process

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