The Application of a Hexavalent Chromium Elimination Agent(CR63) in Leather

The Guangdong Shengfang Chemical Corporation has developed a hexavalent chromium elimination agent(referred CR63),which can effetely prevent the emerging of hexavalent chromium in leather.In order to provide technical information and support for the commercial use of CR63 in leather,in this study the application conditions of the CR63 were optimized.The results show that CR63 was able to control the amount of hexavalent chromium of leather.The increase of the amount of CR63,the reduce of pH value,the decrease of temperature would lower the content of hexavalent chromium in the leather;The optimum operation conditions for the CR63 as following: CR63 dosage 1.5%,pH value 3.0,operating temperature 30 ℃;Under The optimum conditions,the hexavalent chromium of leather could be completely removed by the CR63,and no hexavalent chromium would be also detected even the leathers were treated by aging for 72 h.