摘要
以甲基铝氧烷(MAO)和有机硼化物为助催化剂,分别采用两种单茂膦亚胺钛配合物PT1和PT2为主催化剂进行乙烯丙烯共聚,利用GPC,IR,^(13)C NMR,DSC,WXRD等方法分析了聚合条件对催化活性、乙丙共聚物的相对分子质量及其分布、序列结构及分布等的影响,探讨了所得乙丙共聚物用于润滑油黏度指数改进剂的可行性。实验结果表明,以MAO为助催化剂,单茂膦亚胺钛配合物催化乙丙共聚活性均在10~6 g/(mol·h)以上,PT2为主催化剂时,聚合活性最高可达到7.2×10~6g/(mol·h)。单茂膦亚胺钛配合物耐温性良好,高温下仍具有单活性中心特征,同时氢调敏感性较佳。单茂膦亚胺钛配合物催化所得乙丙共聚物为无规共聚物,相对分子质量分布窄(M_w/M_n=1.75),具有很好的增稠性能、高温抗剪切性能及低温流动及泵送性能,可用作黏度指数改进剂。
A series of copolymerizations solution of ethylene/propylene were carried out using two monocyclopentadienyl titanium phosphinimide complexes PT1 and PT2 as catalysts and methylaluminoxane（MAO） or [Ph3C] [B（C6F5）4] as cocatalysts. The resulting olefin copolymers were characterized by GPC, IR, ^13C NMR, DSC and WXRD, and their applications as viscosity index improvers in oil solutions were also pursued. The monocyclopentadienyl titanium phosphinimide complexes displayed a high catalytic activity over 10^6 g/（mol ·h）. A maximal activity of 7.2×10^6g/（mol·h） was attained using PT2/MAO. These catalysts characteristic of single-site catalysis exhibited good catalytic performance even at high polymerization temperatures and good hydrogen response. The produced ethylene/propylene copolymers are atactic with a narrow relative molecular mass distribution（Mw/ Mn 1.75）. The results indicated that they possess a good thickening efficiency, a high-shear viscosity at a high temperature and an excellent low-temperature fluidity, showing the potential to be used as viscosity index improvers in engine oils.
出处
《石油化工》
CAS
CSCD
北大核心
2017年第8期1034-1042,共9页
Petrochemical Technology
基金
中国石油化工股份有限公司资助项目(214002)
关键词
烯烃共聚物
膦亚胺钛
黏度指数改进剂
增稠性能
抗剪切性能
olefin copolymers
titanium-phosphinimide catalyst
viscosity index improver
thickening efficiency
shear stability
