亜臭素酸ナトリウムの漂白における金属イオン添加の影響

概要

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Effective bleaching conditions with sodium bromite (NaBrO_2) aqueous solution in the presence of metal ions were investigated by using a cellulose film and cotton fabric dyed with direct dye (C. I. Direct Blue 78). Bleaching efficiency was determined using absorbance at dominant wavelength (608 nm) in the case of film and reflectance in the case of fabric. The main results obtained are summarized as follows : 1) In five sodium bromite aqueous solutions, each containing a different kind of metal ion, bleaching efficiency decreased in the order of Al^lt3+gt gt Fe^lt3+gt gt Cu^lt2+gt gt Mg^lt2+gt = Ca^lt2+gt. 2) At room temperature, the most effective bleaching was observed in the presence of 6/100 Al^lt3+gt mol ratio to NaBrO_2, and the addition of more Al^lt3+gt decreased bleaching efficiency, probably due to self-decomposition of NaBrO_2. 3) In bleaching of dyed cotton fabric at various temperatures (10-50℃), bleaching effect and rate of diminution of tensile strength became more remarkable as the temperature increased. 4) For dyed cotton fabrics having the same bleaching efficiency, the rate of diminution of tensile strength by the addition of Al^lt3+gt at room temperature were determined to be ca. 1/4 by heat bleaching.
社団法人日本家政学会の論文
1995-07-15