还原棕BR的电化学还原及其染色工艺

Investigation of electrochemical reduction and dyeing technology of vat brown BR

采用铜镍合金电极作为阳极,铜片作为阴极,研究了影响还原棕BR电化学还原染色工艺的主要因素,如外加电压（U）大小、氢氧化钠（NaOH）质量浓度、三乙醇胺（TEA）质量浓度、硫酸铁（Fe2（SO4）3）质量浓度、阴极面积、还原染色温度（T）、还原染色时间（t）等.通过分析实验结果,获得最佳电化学还原染色工艺,即外加电压3V,NaOH、TEA和Fe2（SO4）3的质量浓度依次为8g/L,30g/L,5g/L,阴极面积25cm2,还原染色温度40℃,还原染色时间70min.同时,测得在最佳工艺参数条件下棉织物染色后的K/S值,得到ΔK/S=0.668,说明该工艺参数条件下织物的匀染性良好,织物的皂洗色牢度和干湿摩擦牢度均能达到4~5级.

Taking the copper nickel alloy electrode as anode plate and copper as cathode,the main influencing factors of vat brown BR electrochemical reduction dyeing performance were studied,such as applied voltage（U）,sodium hydroxide（NaOH）mass concentration,triethanolamine（TEA）mass concentration,ferric sulfate（Fe2（SO4）3）mass concentration and cathode area,vat dyeing temperature（T）,vat dyeing time（t）,etc.By analyzing the experimental results,the optimum parameters of the electrochemical reduction of dyeing are as follows,Uis 3V,the mass concentration of NaOH,TEA,Fe2（SO4）3are 8g/L,30g/L,5g/L respectively,cathode area is 25cm2,Tis 40℃,t is 70 min.under the optimum condition,the dyed K/Svalue of the cotton fabric is measured,andΔK/S=0.668,it indicated that the optimum process parameters can give the fabric good levelness,at the same time,the soaping fastness of the fabric and dry and wet rubbing fastness can reach level 4-5.