煤制油沥青改性制备包覆沥青及其表征分析

Modification of coal to oil asphalt for preparation of coated asphalt and characterization analysis

以煤制油沥青(coal to oil asphalt,CTOA)为原料,加入乙烯焦油沥青(ethylene tar pitch,ETP)进行改性,采用热聚合法制备出高品质的包覆沥青。在最佳热聚合工艺条件下制备出200^(#)包覆沥青;利用元素分析仪、红外光谱仪、拉曼光谱仪、X射线衍射仪、扫描电子显微镜、热重分析仪等对包覆沥青的微观形貌、结构和组成进行分析。结果表明,相较于空气氧化法和催化交联聚合法,改性和热聚合所制备的200^(#)包覆沥青的QI和灰分质量分数显著降低,产品性能优异;微观结构和组成分析表明,包覆沥青分子具有较高的碳质量分数和芳香缩合度,分子中类石墨结构增多,碳微晶排列规整,热重分析结果进一步证实其热稳定性显著增强,可用作锂电负极包覆材料。

Coal to oil asphalt(CTOA)is modified with ethylene tar pitch(ETP)to prepare high quality coated asphalt via hot polymerization process.The 200#coated asphalt is prepared under the optimum thermal polymerization conditions,and analyzed by means of elemental analysis,infrared spectroscopy,Raman spectroscopy,X-ray diffraction,scanning electron microscopy and thermogravimetric analysis.The results show that compared with the asphalt prepared by air oxidation method and catalytic crosslinking polymerization method,200^(#)coated asphalt prepared by modification-thermal polymerization method has much lower QI and ash mass fraction,and presents better product performance.The microstructure and composition analysis show that the molecules of coated asphalt have higher carbon mass fraction,higher aromatic condensation degree,and more graphite-like structure.The carbon microcrystalline arrangement is regular,and the thermogravimetric analysis results further confirm that the thermal stability of molecules of the coated asphalt is significantly enhanced,and the coated asphalt can be used as coating material for anode of lithium ion battery.