低温液压油用黏度指数改进剂氢化丁二烯异戊二烯共聚物的合成

Synthesis of Hydrogenated Butadiene Isoprene Copolymers as Viscosity Index Improvers for Low Temperature Hydraulic Oil

该文采用正丁基锂/四氢呋喃/环己烷体系引发丁二烯异戊二烯共聚合得到了丁二烯异戊二烯共聚物(BIR),采用2-乙基己酸镍/三乙基铝催化体系对其加氢,得到了不同微观结构与分子量的氢化丁二烯异戊二烯共聚物(HBIR)。聚合物的分子量及其分布采用凝胶渗透色谱(GPC)表征,微观结构采用1H-NMR表征,热稳定性采用热重分析(TGA)进行表征。将HBIR溶解在150SN中,考察了微观结构和分子量对增稠能力、剪切稳定性和低温启动性的影响,以及与降凝剂的配伍效果。以HBIR为黏度指数改进剂,调配了不同黏度级别的低温液压油,HBIR可使油品的黏度指数有很大的提升,而对油品的倾点几乎无影响。

The butadiene isoprene copolymers（BIRs） were synthesized by n-Butyllithium（n-Bu Li） / tetrahydrofuran（THF） / Cyclohexane（Cy） initiator system. The hydrogenated butadiene isoprene copolymers（HBIRs） were obtained by catalytic hydrogenation of the BIRs proceeded by Nickel 2- ethylhexanoate / triethyl aluminum. The molecular weights and molecular weight distributions of the polymers were characterized by gel permeation chromatography（GPC）, and the microstructures of the polymers were determined by1H-NMR, and the thermostabilities were measured by thermo gravimetric analysis（TGA）. The HBIRs were dissolved in 150 SN base oil, and effects of the microstructures and the molecular weights on the performance including the thickening abilities, the shear stabilities, and the low temperature start abilities were investigated, and the compatibilities with pour point depressant were studied. Several low temperature hydraulic oils with different viscosity grade were formulated using HBIR as viscosity index improver. HBIRs could improve the viscosity index of the oils drastically, but had no effect on pour point.