摘要
研究了荆树皮栲胶及其氧化降解改性产物与铬离子络合反应的规律 ,测定了反应的 pH及沉淀量。结果表明 :(1)荆树皮栲胶降解产物与铬 (Ⅲ )的络合性质不同于原荆树皮栲胶 ,降解程度不同 ,产物的络合反应性质有一定的差异 ;(2 )高度氧化降解产物与铬 (Ⅲ )在 pH2 - 12范围内不产生沉淀 ,形成抗一定碱性的溶液 ;适度降解的产物与铬 (Ⅲ )络合后产生沉淀 ,随降解产物用量比例增大 ,反应温度的提高 ,沉淀量增加 ;(3)在相同温度下 ,随降解产物用量比例增大 ,络合反应 pH值有增大的趋势 ,且氧化降解程度越高 ,pH增幅越大。
Complex reactions between Cr 3+ and Black Wattle Extract and its oxidizing degraded products (obtained by using 15%,30%and 60% H 2O 2)have been studied and variations of pH and precipitate in these reactions ave also been determined. The results show that(1)The oxidizing degraded products have different complex properties from original extract, and vary with oxidizing degree.(2) The complexes of high oxidizing degraded products with Cr(Ⅲ) have no precipitate in pH 2-12,and they can resist certain alkali; While the complexes of moderate oxidizing degraded products have precipitate, and precipitate rises correspondingly with temperature rises, and varies with different products.(3)Under the same temperature,pH rises with the increase of usage in extract products, and the higher the oxidizing degree of products, the higher pH rises.
出处
《皮革科学与工程》
CAS
2002年第2期18-21,27,共5页
Leather Science and Engineering
基金
四川省应用基础研究资助项目
