Mechanism of viscosity increase in polyisobutylene succinimide during thermal storage
Qingyang Yuan
SINOPEC Research Institute of Petroleum Processing Co., Ltd.
zuoxin Huang
SINOPEC Research Institute of Petroleum Processing Co., Ltd.
DOI: https://doi.org/10.59429/esta.v12i2.10555
Keywords: Succinimide; Ashless dispersant; Thermal storage; Kinematic viscosity
Abstract
Aiming at the problem of viscosity increase in polyisobutylene succinimide (PIBSI)-type ashless dispersants during thermal storage, this study integrates electronic science and technology to explore the mechanism. Methods such as Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), and reaction kinetics calculations were used to analyze the viscosity increase mechanism under thermal storage conditions. The effects of chemical structure changes on properties were evaluated through spot tests and simulated crankcase tests. The results show that the nucleophilic substitution reaction between the primary amine terminal group and the carbonyl carbon of the five-membered ring succinimide generates secondary amide, leading to an increase in relative molecular weight and kinematic viscosity. However, the changes in chemical structure and viscosity have no significant impact on dispersibility and high-temperature detergency. This study provides a theoretical basis for improving the viscosity increase problem and highlights the application value of electronic science and technology in fine chemistry.
References
[1]Kumar R, Zheng B, Huang K W, et al. Synthesis of highly reactive polyisobutylene catalyzed by EtAlCl₂/bis (2-chloroethyl) ether soluble complex in hexanes[J]. Macromolecules, 2014, 47(6): 1959-1965.
[2]Zhang He, Huang Qing, Zhou Xuguang. Research Status and Progress in Synthesis of Ashless Dispersants[J]. Lubricating Oil, 2017, 32(6): 26-33.
[3]Gao Junbao, Chen Bingyao, Yang Shanjie. Overview of Applications of Detergents and Dispersants[J]. Light Industry Science and Technology, 2021, 37(1): 39-40.
[4]Shi Shunyou, Wang Xuemei. New Specifications CK-4 and FA-4 for Heavy-Duty Diesel Engine Oils in the United States and Their Impacts[J]. Lubricating Oil, 2017, 32(6): 47-55.
[5]Gieselman M D. Mannich post-treatment of PIBSA dispersants for improved dispersion of EGR soot: U.S. Patent 8, 324, 139[P]. 2012-12-4.
[6]Link J, Eldin S. Use of polyalkenyl succinimides in acrylic acid production: U.S. Patent 7, 880, 029[P]. 2011-2-1.
[7]Stokes C D, Simison K, Storey R F, et al. Method for preparing polyolefins containing a high percentage of exo-olefin chain ends: U.S. Patent 7, 705, 090[P]. 2010-4-27.
[8]Zhou Yuehua, Chen Zhiming. Study on Synthesis Process of Polyisobutylene Succinimide by Thermal Method[J]. Jiangsu Chemical Industry, 2007 (5): 23-26.
[9]Zhao Min, Huang Zuoxin, Duan Qinghua. Study on Alkylation Process of Polyisobutylene Maleic Anhydride Synthesized by Thermal Method[J]. Petroleum Products Application Research, 2012, 30(6): 58-61.
[10]Huang Wenxuan. Basic Properties and Application Guide of Lubricant Additives[M]. China Petrochemical Press, 2021.
[11] Su Feiming, Shi Yan, Zhao Hourui, et al. Effects of Polyisobutylene with Different Relative Molecular Weights on Performance of Ashless Dispersants[J]. Petroleum Processing and Petrochemicals, 2021, 52(9): 56.
[12]Li Xingyi, Zhao Chongzhi, Xiong Chongxiang, et al. Interaction Between Succinimide Ashless Dispersant and ZDDP[J]. Petroleum Processing and Petrochemicals, 2000, 31(3): 34-39.