废旧深蓝色棉/涤织物的脱色工艺与机制研究  

Research on Decolorization Process and Mechanism of Waste Dark-blue Cotton/Polyester Fabric

作　　者：王莹 金秋怡 周哲[1] WANG Ying;JIN Qiu-yi;ZHOU Zhe(College of Materials Science and Engineering,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University,Shanghai 201620)

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海201620

出　　处：《纺织科学与工程学报》2024年第3期8-12,25,共6页Journal of Textile Science & Engineering

基　　金：国家重点研发计划项目(2020YFC1910302)。

摘　　要：以硫化蓝染色的废旧深蓝棉涤织物为原料,采用氢氧化钠和二氧化硫脲脱色体系对其进行脱色处理。以明度和脱色率为评价指标,通过单因素实验研究了脱色工艺,并探讨了脱色体系的作用机理。结果表明:在20 g/L氢氧化钠和5g/L二氧化硫脲、脱色温度为90℃、脱色时间为60 min的工艺下,织物脱色后的明度值可达60以上,脱色率为81.5%。脱色体系中的氢氧化钠通过水解作用剥离织物上的染料使其脱色,二氧化硫脲则通过还原作用破坏染料的发色基团而使织物脱色,且其在碱性体系中可进一步提升脱色效果,因此二者具有协同脱色作用。脱色处理对织物的化学结构和晶体结构基本没有影响,脱色后织物的断裂强力下降不大,因此该脱色体系可实现废旧棉混纺织物的温和脱色。The waste dark-blue cotton/polyester fabric dyed with sulfur blue was taken as the raw material,sodium hydroxide(NaOH)and sulfur dioxide urea(TDO)decolorization system was employed for its decolorization.With lightness and decolorization rate as evaluation indicators,the decolorization process was investigated through single-factor experiments and the mechanism of decolorization system was discussed.The results showed that under the process conditions of 20 g/L NaOH and 5 g/L TDO,with the decolorization temperature of 90℃and the decolorization time of 60 min,the lightness value of the fabrics after decolorization reached above 60 with a decolorization rate of 81.5%.In the decolorization system,NaOH stripped the dyes on the fabrics to achieved decolorization by hydrolysis;TDO broke down the chromophoric groups in the dyes through the reducing action,and it further improved the decolorization effect in alkaline condition.Thus,these two components had synergistic decolorization effect.The decolorization treatment hardly affected the chemical and crystal structures of the fabrics,and there was only a minor decrease in the breaking strength of the fabrics after decolorization,achieving a gentle decolorization of the waste cotton/polyester blended fabric.

关 键 词：废旧深蓝色棉涤织物 脱色工艺 二氧化硫脲 氢氧化钠 硫化染料 

分 类 号：TS106[轻工技术与工程—纺织工程] TS102.9[轻工技术与工程—纺织科学与工程]