摘要
利用棉纤维和涤纶不同的耐酸性，结合亚临界水的特性，采用水热法对废旧涤棉混纺织物的分离回收进行了考察。以m（涤纶）：m（棉）=1：4的废旧涤棉织物为考察对象，HCl为催化剂，研究了水热温度、反应时间及HCl质量分数对分离过程的影响，并利用FTIR、XRD、SEM、HPLC及DSC对水热反应前后产物的物化性能进行了表征。结果表明：在水热温度150℃、反应时间3h、w（HCl）=1．5％的水解条件下，混纺织物中棉纤维一部分水解形成固体纤维素粉末，产率约为48．21％；其余水解生成水溶性糖类物质，其中葡萄糖质量分数为15．57％；水热处理后的涤纶纱线回收率高达96．24％，断裂强度约降低3％。含有水溶性糖类的水解液可循环使用5次。
Separation and recovery of waste polyester-cotton blended fabric was investigated by hydrothermal method, considering different acid resistance of cotton fiber and polyester fiber and characteristics of subcritical water. The effects of hydrothermal temperature, reaction time and mass fraction of hydrochloric acid on the separation process were studied by using polyester/cotton blended waste fabrics （mass fraction of polyester to cotton 1 ： 4） as raw materials, hydrochloric acid as catalyst. The physicochemical properties of products before and after hydrothermal reaction were characterized by FTIR, XRD, SEM, HPLC and DSC. The results indicated that the optimum hydrothermal process was determined as follows： hydrothermal temperature 150 ℃, and reaction time 3 h, mass fraction of hydrochloric acid 1.5%. Some cotton fiber in blended fabric was hydrolyzed into solid cellulose with a yield of about 48.21%, while the other dissolved cotton was turned to be water-soluble carbohydrates, with a glucose mass percentage of 15.57%. After hydrothermal treatment, the recovery rate of polyester yarn was up to 96.24%, and the fracture strength was reduced by about 3%. The hydrolysate containing water-soluble carbohydrates could be recycled 5 times.
作者
张美玲
史晟
侯文生
张博楠
凌晨
王淑花
牛梅
ZHANG Mei-ling;SHI Sheng;HOU Wen-sheng;ZHANG Bo-nan;LING Chen;WANG Shu-hual;NIU Mei(College of Textile Engineering,Taiyuan University of Technology,Jinzhong 030600,Shanxi,China;Shanxi Ruisaige Textile Technology Co.,Ltd.,Jinzhong 030600,Shanxi,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2018年第9期1548-1554,1561,共8页
Fine Chemicals
基金
国家自然科学基金(51443005)~~
关键词
废旧涤棉织物
水热反应
分离
水解
回收再利用
waste polyester-cotton blended fabric
hydrothermal reaction
separation
hydrolysis
recyclingand reusing
