氧化和还原漂白对大豆纤维结构性能的影响

Influence of oxidation and reduction bleaching on structure and properties of soybean fibers

还原漂白的大豆纤维白度和失重率很低 ,还原漂白对大豆蛋白含量和微细结构无影响、对可染性的影响很小。在氧化漂白中 ,亚氯酸钠和双氧水 /四乙酰乙二胺 (反应生成过乙酸 )的漂白效果很好 ;亚漂纤维的失重率高、大豆蛋白含量降低较大 ,漂白时大豆蛋白的流失极大地降低了可染性 ;双氧水 /四乙酰乙二胺和双氧水漂白的纤维失重率低、大豆蛋白含量稍有降低 ,两者 (尤其是前者 )对碱性和羟基氨基酸的可能的氧化作用导致了可染性的降低。

The whiteness and weight loss of soybean fibers bleached by the reductants were very low. Reduction bleaching had no influence on the soybean protein content and fine structure of soybean fibers, and slight influence on dyeability. As for oxidation bleaching, the bleaching effect of sodium chlorite and hydrogen peroxide/tetraacetylethylenediamine (peracetic acid as a resultant of reaction) was much better. The high loss of weight and soybean protein during chlorite bleaching greatly decreased the dyeability of soybean fibers. The fibers bleached by hydrogen peroxide and hydrogen peroxide/tetraacetylethylenediamine exhibited a low weight loss and a slight decrease in soybean protein content. The potential oxidation action of peracetic acid and hydrogen peroxide (especially the former) to the basic and hydroxyl amino acids of soybean protein gave rise to the obvious decrease in dyeability. Oxidation and reduction bleaching hardly affected the crystallinity of soybean fibers.