废旧涤纶/棉混纺军训服的化学分离回收

针对军训服每年产生大量的废弃,造成原料涤纶/棉混纺织物浪费的状况,将醋酸锌、尿素、尿素-醋酸锌共晶体系作为催化剂,通过乙二醇醇解法对废旧涤纶/棉混纺军训服中的涤纶组分进行解聚回收,并通过酸解法对棉纤维素组分进行回收;研究了催化剂种类、催化剂用量、反应温度和时间对废旧涤纶/棉混纺军训服、白色涤纶/棉混纺织物、白色涤纶织物...

Chemical separation and recycling of waste polyester/cotton blended military training uniforms

Polyester/cotton blended fabrics are widely used for military training uniforms and civilian military training uniforms.However,the military training uniforms,form a large amount of waste every year,leading to heavy waste of resources.This paper reports the alcoholysis of polyester from the polyester/cotton blended military training uniforms with zinc acetate,urea,and urea-zinc acetate eutectic system as catalysts,where the cellulose was also recycled through this acid hydrolysis.The influence of the catalyst type and dosage,and the reaction temperature and time on the alcoholysis efficiency of polyester was explored.Three different waste textiles containing polyester were used.The alcoholysis polyethene terephthalate(BHET)monomer and acidolysis cellulose were characterized using the fourier transform infrared,nuclear magnetic resonance,differential scanning calorimetry analyses.The results show that the polyester has good alcoholysis efficiency under the following conditions:zinc acetate as the catalyst,the relative mass fraction of waste military training uniforms was 0.6%,the reaction solid-liquid ratio was 1∶6,the reaction temperature was 196℃,and the reaction time was 3 h.White cellulose was obtained and the goal of separating and recycling different components of waste military training uniforms was achieved.