聚(油酸-苯乙烯)双功能润滑油添加剂的合成

Synthesis of poly(oleic acid-styrene)bifunctional lubricant additive

以植物油中广泛存在的油酸为原料,引入第二单体苯乙烯,采用Schlenk装置,通过溶液聚合法合成了油酸-苯乙烯共聚物(POS),采用FTIR,^(1)H NMR,TG表征了合成产物的结构,测定了它的相对分子质量及多分散性指数,并评价了它的抗磨和降凝性能。实验结果表明,在80℃、油酸与苯乙烯质量比为3∶7、引发剂含量为0.8%(w)、反应10 h时,POS的收率为47.52%、相对分子质量为1.203×10^(4)、多分散性指数为1.63。将0.8%(w)的POS添加到润滑油馏分(350~395℃)中,可将磨斑直径降低0.334 mm,凝点降低10℃。POS可作为一种兼有抗磨和降凝双重功能的润滑油添加剂代替传统石油基润滑油添加剂。

Poly(oleic acid-styrene)(POS)was synthesized by solution polymerization method in Schlenk device using oleic acid(OA),a common vegetable oil,as raw material,styrene(St)as the second monomer.Its structure was characterized by FTIR,^(1)H NMR and TG,its relative molecular mass and polydispersity index were determined,and its anti-wear and solidifying point depression properties were evaluated.The experimental results show that when the m(OA)∶m(St)is 3∶7,the initiator amount is 0.8%(w),the reaction temperature is 80℃ and the reaction time is 10 h,the yield of POS is 47.52%,the relative molecular mass is 1.203×10^(4) and the polydispersity index is 1.63.Adding 0.8%(w)POS to the lubricating oil fraction(350-395℃)can reduce the wear scar diameter by 0.334 mm and the solidifying point by 10℃.The synthesized POS can be used as a lubricant additive with dual functions of anti-wear and solidifying point depression to replace the traditional petroleum-based lubricant additive.