低密度聚乙烯/超细煤粉复合材料的热反应性研究

Study on Thermal Reactions of Low-density Polyethylene/Coal Composites

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(PE-LD)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PE-LD/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340～380℃时活化能为113kJ/mol,520～550℃时热解活化能为149kJ/mol;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。

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.