石油管道输送用高效减阻剂超高分子量聚1-辛烯的合成及其结构性能  

Synthesisk,structure and properties of ultra-high molecular weight poly(1-octene)as high efficient drag reducer for oil pipeline transportation

作　　者：李春漫 LI Chunman(PipeChina Institute of Science and Technology,Langfang 065000,China)

机构地区：[1]国家管网集团科学技术研究总院分公司,河北廊坊065000

出　　处：《石油化工》2023年第2期209-215,共7页Petrochemical Technology

摘　　要：以苯酚及其衍生物为原料合成了5种新型非茂金属催化剂。采用低温常压液相本体法,以1-辛烯为单体,聚合得到超高分子量聚1-辛烯减阻剂,考察了聚合条件的影响。利用NMR,XPS,DSC,FTIR,XRD等方法对催化剂结构进行了表征,并分析了聚1-辛烯的性能。实验结果表明,含强吸电子原子F的苯氧基基团,可提高催化剂活性中心的稳定性,优选含2,6-二氟苯氧基的Cat.4作为催化剂。Cat.4/甲基铝氧烷体系催化1-辛烯聚合适宜的条件为:第1阶段聚合温度0℃,聚合时间24 h;第2阶段聚合温度5℃,聚合时间144 h;n(Al)∶n(Ti)=50∶1,n(1-辛烯)∶n(Ti)=2000∶1。在该条件下,单体转化率为96.9%,所得聚1-辛烯的M_(η)高达3.55×10^(6),为无定形结构,易溶于油品中,减阻率为46.9%,与进口产品性能相当。Five kinds of new-type non-metallocene catalyst were synthesized using phenol and its derivatives as raw materials.Ultra-high molecular weight poly(1-octene)drag reducer was obtained by these catalysts from 1-octene through the low temperature liquid phase bulk polymerization process at atmospheric pressure,and the effects of polymerization conditions were investigated.The structures of the catalysts and the properties of poly(1-octene)were characterized by NMR,XPS,DSC,FTIR and XRD.The experimental results indicate that the stability of the active center of the catalyst can be improved by the phenoxide group containing strong electron-withdrawing atom F,so Cat.4 containing 2,6-difluorophenoxy was chosen as the catalyst for 1-octene polymerization.The optimum conditions for 1-octene polymerization by Cat.4/methylaluminoxane are as follows:0℃and 24 h at the 1^(st) stage,5℃and 144 h at the 2^(nd) stage,n(Al)∶n(Ti)=50∶1,n(1-octene)∶n(Ti)=2000∶1.Under these conditions,the monomer conversion is 96.9%,M_(η) of the produced poly(1-octene)is 3.55×10^(6).The product has an amorphous structure and is easily soluble in oil,and its drag reduction rate is 46.9%,which is equivalent to the imported products.

关 键 词：非茂金属催化剂 超高分子量聚1-辛烯 减阻剂 

分 类 号：TE869[石油与天然气工程—油气储运工程]