摘要
研究了铬鞣后染色和加脂工序对皮革中铬释放的影响。结果表明:单独进行染色、加脂时,染料和加脂完成渗透后,废液中铬浓度分别为30～50mg/L和70～300mg/L;经甲酸固定后,由于染料和加脂剂与铬有一定程度的结合,浴液中的一部分铬会随之重新与胶原纤维结合,使得废液中的铬浓度降低近50%。同浴染色、加脂时,铬的释放量会显著降低,因此采用该工艺是降低铬释放的有效而简单的方法。染色、加脂工序中铬的释放不会明显改变皮革的收缩温度,说明释放的铬多为物理形式沉积在皮纤维中的铬或单点结合的铬。
Chrome release of chrome - tanned leather in fatliquoring and dyeing processes was investigated. It shows that the chrome concentrations in dyeing and fatliquoring wastewaters are 30 ～50mg/L and 70 ～ 300mg/L （ before fixing） , respectively, when dyeing and fatliquoring are performed individually. After fixed by formic acid, a part of chrome in float goes back to leather and bound with collagen fibers again together with dyes or fatliquors. As a result, the chrome concentration in wastewater reduces by 50% after fixing. The released chrome is obviously reduced in one - bath dyeing and fatliquoring process. So this technique is suggested to be a simple and effective approach to reduce chrome release. Interestingly, the release of chrome in fatliquoring and dyeing processes scarcely reduce the shrinkage temperature of chrome - tanned leather. This result indicates that the released chrome mainly originates from the physically precipitated chrome on collagen fibers or the chrome being weekly combined with leather.
出处
《中国皮革》
CAS
北大核心
2013年第9期21-24,29,共5页
China Leather
基金
新世纪优秀人才支持计划(NCET-11-0358)
国家科技支撑计划课题(2011BAC06B11)
中央高校基本科研业务费专项资金资助
关键词
铬鞣
加脂
染色
铬释放
废液
铬浓度
chrome tannining
fatliquoring
dyeing
chrome release
wastewater
chrome concentration
