废旧涤棉混纺织物脱色工艺研究  

Decolorization technology research of waste polyester cotton blended fabric

作　　者：闫妙瑶 史晟[1] 高承永 李鑫[1] 侯文生[1] YAN Miaoyao;SHI Sheng;GAO Chengyong;LI Xin;HOU Wensheng(Taiyuan University of Technology,Jinzhong,030600,China)

机构地区：[1]太原理工大学,山西晋中030600

出　　处：《棉纺织技术》2024年第12期79-85,共7页Cotton Textile Technology

基　　金：国家自然科学基金项目(51903184);山西省自然科学基金项目(20210302124058);山西浙大新材料与化工研究院研发项目(2022SX-TD005);江苏省纺织印染节能减排与清洁生产工程研究中心开放课题(SDGC2307)。

摘　　要：为解决染化料对废旧涤棉混纺织物再利用的影响,实现再生产品的高值化,采用N,N⁃二甲基乙酰胺(DMAc)对废旧涤棉混纺织物进行溶解脱色,再经二氧化硫脲(TD)和氢氧化钠协同作用进一步还原脱色。通过分析脱色过程中各因素对织物脱色率和强力保留率的影响,确定最优溶解⁃还原脱色工艺参数。分析了脱色前后织物的形貌结构、热力学性能、晶体结构,并对脱色后DMAc的回收再利用性能进行了分析。结果表明:溶解最优工艺参数为DMAc用量24 mL,反应温度145℃,反应时间120 min;还原最优工艺参数为TD质量浓度3.65 g/L,NaOH质量浓度10 g/L,温度90℃,处理时间60 min。在最优工艺条件下织物脱色率和强力保留率分别达到98.33%和92.04%,脱色后织物晶体结构变化较小,热力学性能较好,使用后的DMAc试剂可以至少循环回收4次,脱色率均在94.90%以上。In order to solve the influence of dyeing and chemical materials on the reuse of waste polyester cotton blended fabrics,to realize the high value of recycled products,N,N-dimethylacetamide(DMAc)was used to decolorize the waste polyester cotton blended fabrics by dissolution Then synergistic action of thiourea dioxide(TD)and sodium hydroxidefurther were done and decolorized.Taking the decolourisation rate and fabric strength retention rate as the evaluation indexes,the effects of various factors in the decolourisation process were investigated,and the optimal process was finally determined.The morphology,thermodynamic property,crystal structure and recycling property of the fabrics before and after decolourisation were analysed.The recycling and reuse performance of DMAc after decolorization was analyzed.The results showed that the optimal solution processing parameter was DMAc dosage 24 mL,reaction temperature 145℃,reaction time 120 min.The optimal reduction processing parameter was TD 3.65 g/L,NaOH 10 g/L,temperature 90℃and treat time 60 min.The retention of strength and decolorization rate were reached 98.33%and 92.04%,respectively.In this case,the change of crystal structure was smaller,the thermodynamic property was better.The DMAc reagent can be recycled at least 4 times after use,the decolorization rate was reached above 94.90%.

关 键 词：溶解还原工艺 涤棉混纺织物 废旧纺织品 脱色 白度 循环回收 

分 类 号：TS190.8[轻工技术与工程—纺织化学与染整工程]