EG对服装用废旧涤棉织物炭化性能及产率的影响

Effect of EG on carbonization property and yield of waste cotton fiber for garment

以水热法对涤棉混纺织物进行处理,水解涤纶回收乙二醇(EG),降解棉纤维得到碳微球,对各项工艺参数进行优化。不同EG质量分数的涤棉织物降解后形成不同微观结构的炭化物,EG质量分数提高,球状产物数量减少,形成不规则分布的颗粒,引起明显的碳产物联结状态;同时C、O质量比出现抛物线增长。加入EG后形成了更高的焦炭热值,EG质量分数为30%时,最大焦炭热值为32.1 MJ/kg。加入EG后对棉纤维进行水热炭化,热解结束后的固体残留达50%,说明碳产物具有良好的热稳定性。水热温度上升后碳产率先降低后增大再降低;超过280℃后,整个体系达到很高的能量状态,一些不稳定小分子裂解后发生脱离,质量变小。

Polyester/cotton blended fabric was treated by hydrothermal method,ethylene glycol(EG)was recovered by hydrolyzing polyester,and then carbon microspheres were obtained by degrading cotton fiber.The optimization of the process parameters was carried out.Carbides with different microstructures were formed after degradation of polyester cotton fabrics with different EG content.When the content of EG in⁃creased,the number of globular products decreased,resulting in the formation of irregularly distributed parti⁃cles and significant carbon product coupling state.At the same time,the C/O mass ratio increased parabolical⁃ly.When EG was added,a higher coke calorific value was obtained,EG content was 30%,the corresponding maximum coke calorific value was 32.1 MJ/kg.After adding EG,the cotton fiber was carbonized by hydrother⁃mal method,and the residual solids reached 50%after pyrolysis,which indicated that the carbon product had good thermal stability.When the hydrothermal temperature rised,the carbon yield first decreased,then in⁃creased,and finally decreased.When the temperature was over 280℃,the whole system reached a high en⁃ergy state,and some unstable molecules broke apart after splitting,which led to the decrease of mass.