低密度聚乙烯／超细煤粉复合材料的热反应性研究

摘要

Pulverized Shenfu coal （SFC） was treated with ferric chloride （FeCI3· 6H2O） to prepare active coal via solid phase ion exchange. The active coal was blended with low-density polyethylene （PE-LD）. Differential scanning calorimetry （DSC） and other analytical methods were used to study the pyrolysis reaction and thermal decomposition kinetics of SFC, PE-LD, and PE-LD/SFC composites and the data were analyzed with Kissinger and Flynn-Wall-Ozawa methods. The activation energy of SFC was calculated as 113 kJ/mol at 340-380℃ and 149 kJ/mol at 520- 550 ℃. When adding 10% and 20% Fe3＋ modified SFC, the thermal activation energies at the low temperature （120-135℃） of PE-LD/SFC composites were 182. 87 kJ/mol and 250. 62 kJ/mol. When adding 10% Fe3＋ modified SFC, the reactivity of coal and PE-LD was better, so there must be Coordinated action between two points.%选用神府主焦煤（SFC）作为原煤，通过行星球磨机制备超细煤粉，用氯化铁（FeCl3·6H2O）过渡金属盐对超细样品进行机械力化学固相改性，制备出活性煤粉，以不同配比与低密度聚乙烯（PELD）共混制备复合材料。利用差示扫描量热仪等分析测试手段，探讨了SFC、PE-LD以及PELD／SFC复合材料的热解反应性和热解动力学。结果表明，Kissiger法和Flynn—Wall-Ozawa法在热分析动力学允许的范围内，计算结果具有一致性；SFC在340380℃时活化能为113kJ／mol，520-550℃时热解活化能为149kJ／tool；添加10％（质量分数，下同）和20％铁改性SFC的PE-LD／SFC复合材料，在低温区（120～135℃）的热解活化能分别为182．87、250．62kJ／mol；铁改性SFC含量为10％时，煤与PE-LD的反应性较好，两组分之间存在一定协同作用。