环保沥青的制备.doc

无机非金属材料工程毕业论文 环保沥青的制备 专 业: 无机非金属材料工程 摘 要 本论文拟以煤沥青为原料，采用热聚合－减压蒸馏的方法制备中间相含量高的热聚合沥青，研究热缩聚条件（包括热缩聚温度、压力和反应时间等）对中间相组分形成和发展的影响，建立热缩聚条件与沥青中α树脂、β树脂、γ树脂和残碳率之间的关系。用红外光谱分析仪、热台偏光显微镜、场发射扫描电子显微镜和综合差热分析仪等手段对制得的热聚合沥青得元素组成、中间相小球体的形成、炭化后的形貌以及热性能进行了分析表征。结果表明：在初始压强很小的情况下，无论最终压强为多大，制得的热聚合沥青中的α树脂的含量在实验测试的保温时间内，都是随保温时间的增加而呈增大的趋势，而β树脂的含量则呈减小的趋势，同时，较低的最终压强有利于β树脂含量的提高。当充入氮气，给反应釜内提供约0.4MPa的初始压强时，沥青中间相的含量随着保温时间的增加而增大，而α树脂的含量和β树脂的含量也相应的增加。 关键词： 改质沥青；中间相；环保；含碳耐火材料 Abstract Thermal polymerized pitchs were prepared from coal tar pitch by method of thermal polymerization and solvent extraction. The thermal polycondensation conditions (including thermal polycondensation temperature, pressure and reaction time, etc.) on the mesophase composition formation and development were studied. The relationship between conditions of thermal polycondensation, α, β, γ resin of coal tar pitch, and the rate of residual carbon was established. Formation of small mesophase spheres, the microstructure of pitchs after coking and thermal performance of thermal polymerization pitchs were studied by means of Raman spectrometer, hot stage polarized light microscopy, field emission scanning electron microscope and differential thermal analyzer. It suggested that, in the case of very small initial pressure, regardless of the pressure, α-resin content of the thermal polymerization pitchs are increasing with the prolong of soaking time, while β-resin content are decreased at the same time. Lower final pressure is beneficial to the increase of β-resin content. When the reactor is filled with 0.4MPa nitrogen, the mesophase of the pitch increases significantly with the prolong of soaking time, while the content of α and β resin substantially increase, and the residual char yield increase slightly. Keywords: Modified pitch; Mesophase; Green; Carbon refractories 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc232498879 第1章 文献综述 PAGEREF _Toc232498879 \h 1 HYPERLINK \l _Toc232498880 1.1 常用碳质结合剂简介 PAGEREF _Toc232498880 \h 1 HYP