活性染料在D5悬浮染色体系中的水解动力学研究

Study on hydrolysis kinetics of reactive dyes in dye/D5 suspending system

采用HPLC研究活性染料/D5悬浮体系染色过程中染料的水解性能,以明确该体系所实现的超低浴比染色环境是否有效抑制染料水解从而获得更高固着率的机制。通过模拟D5染色和传统水浴染色的染料水解环境,研究了不同环境下C.I活性红195在pH值为11、60～80℃条件下的水解情况。结果表明:活性染料/D5悬浮体系染色过程中极少水量的染色环境显著抑制了染料水解,pH值为11条件下水解90 min,D5介质中双水解染料量相对传统水浴60℃减小27.8%,70℃减小57.8%,80℃减少51.1%。相同温度下,传统水浴中染料的水解速率是D5介质中的1.8倍左右。同时,一定量织物的存在可进一步降低D5介质染色的模拟水解条件下双水解染料的量,水解速率常数也有所降低。

Hydrolysis kinetics of reactive dye in dye/D5 suspending system was investigated using HPLC to see whether the super low bath ratio dyeing realized by this system had effectively inhibited dye hydrolysis and thus obtained a higher fixation ratio.HPLC analysis of dye hydrolysis kinetics was carried out using C.I.Reactive Red 195 under the simulated hydrolysis conditions at pH=11,and temperature 60～80 ℃.The results showed that hydrolysis of dye in dye/D5 suspending system was much lower than that in aqueous system.The amount of complete hydrolyzed dye after 90 min treatment in the dye/D5 suspending system under simulated conditions at pH=11 was reduced by 27.8% at 60 ℃,57.8% at 70 ℃ and 51.1% at 80 ℃,respectively,as compared with the conventional aqueous system.And when the temperature was identical,the hydrolysis rate in aqueous system was 1.8 times of that in the dye /D5 system.When hydrolysis performed in the presence of fabric in dye/D5 suspending system,the amount of complete hydrolyzed dye was further reduced,and so did the rate constants.