不同相对分子质量聚异丁烯对无灰分散剂性能的影响

以不同相对分子质量的聚异丁烯(PIB)为原料,与胺、烯酐、稀释剂等在不同条件下反应,制备润滑油无灰分散剂聚异丁烯丁二酰亚胺(PIBSI),并测试其分散性能和抗氧化性能;考察PIB相对分子质量、中间产物聚异丁烯丁二酸酐(PIBSA)的合成工艺对PIBSI性能的影响.结果表明:随着原料PIB相对分子质量的增加,PIBSI的...

EFFECT OF PIB RAW MATERIALS WITH DIFFERENT MOLECULAR WEIGHTS ON THE PERFORMANCE OF ASHLESS DISPERSANT

Polyisobutylene succinimide (PIBSI), an ashless dispersant for lubricating oil, was prepared by using polyisobutylene (PIB) with different molecular weights as raw materials, reacting with amine, maleic anhydride and diluent under different conditions, and its dispersion and oxidation resistance were tested. The effects on PIBSI properties of PIB with different molecular weights and synthesis process of polyisobutylene succinic anhydride (PIBSA) were investigated. The results show that with the increase of the relative molecular weights of PIB, the dispersion and antioxidant properties of PIBSI are improved. Compared with chlorination process, free radical one-step process can not only reduce energy consumption and pollution, but also improve the performance of PIBSI. Among them, PIBSI prepared from PIB raw materials with number average molecular weight of 2 300 by free radical one-step process has the best dispersion performance, and its oil sludge dot dispersion value (SDT) can reach 73.15%.