【摘要】 以煤沥青为原料、甲醛为改性剂及草酸为催化剂来制备改性煤沥青。通过核磁共振氢谱(1H-NMR)、X射线衍射(XRD)谱图对沥青微观结构进行表征。通过残炭率、软化点及其粘度与温度间的关系研究沥青的流变性能。结果表明:甲醛含量对改性沥青性能影响极大。改性煤沥青的残炭率、软化点随甲醛含量的增加先增大后减小,当甲醛/煤沥青的值为0.1时,残炭率(55.1%)和软化点(96℃)均达到最佳值。随着温度升高,改性沥青的粘度和粘流活化能均下降,这有利于改善煤沥青的浸渍技术工艺操作。更多还原

【Abstract】 The modified coal tar pitches were prepared by using coal tar pitch as raw material,formaldehyde as modification agent and oxalic acid as catalyst. The microstructure of the pitches was examined by Proton Nuclear Magnetic Resonance( 1H- NMR) and X- ray diffraction. The rheological behavior of the pitches was investigated by coking value,softening point and the relationship between viscosity and temperature. The results indicated that the formaldehyde content had great effect on the propertiesof pitches. The coking value and softening point increased with the increasing of formaldehyde content,and then decreased. When the value of formaldehyde / pitch was 0. 1, the carbon residue rate( 55. 1%) and the softening point( 96 ℃) were to reach the optimal value. With the temperature increasing,the viscosity and flow activation energy decreased,which would facilitate the impregnation technology operation of the coal tar pitch.更多还原