煤沥青筑路油受氢改质

HYDROGEN-ACCEPTING MODIFICATION OF COAL TAR PITCH ROAD BINDER

研究了煤沥青在供氢剂 (再生橡胶 )的作用下 ,族组成随反应时间的变化规律及其受氢改质机理。利用核磁共振、元素分析、分子量测定等手段 ,计算得到了煤沥青、溶剂油以及改质筑路油等的平均结构参数。结果表明 :与空白样对比 ,加入再生橡胶使得筑路油中沥青质含量由 4 5 0 %增加到 61 5 %,软沥青由 2 7 0 %降低到 1 4 4%,不溶物由 2 8 0 %降低到 2 4 1 %。对比橡胶和筑路油族组成的1H -NMR谱图可发现 ,在化学位移δ =5 5和 5 3处均有H质子峰出现 ,表明橡胶参与了改质反应 ,形成了新的沥青质。橡胶在改质过程中作为供氢媒介参与筑路油的热解反应 ,正是煤沥青的受氢作用改善了筑路油的质量。

The change in group component of the coal tar pitch road binder modified by tired rubber with reaction time and its modified mechanism were studied The average structural parameters of the coal-tar-pitch ,solvent oil and modified road binder were calculated by Brown-Lander formula using NMR, ultimate analysis and average molecular weight Results showed that the TS(toluene soluble of the binder modified with rubber)increased from 45 0% to 61 5%,HS(heptane soluble)decreased from 27 0% to 14 4%,TIS(toluene insoluble)decreased from 28 0% to 24 1% as compared with the binder without rubber In contrast of the 1H-NMR of the group components of the rubber with those of the road binder,there were the same H pulses at δ=5 5 & 5 3 It was considered that the rubber,as a hydrogen donor,might take part in the modification of coal tar pitch and formed a new asphaltine It was the hydrogen-accepting function of the coal tar pitch that the quality of the coal tar pitch road binder was improved