Polyfunctional PIB succinimide type engine oil additives

Abstract

Keywords INTRODUCTION Polyfunctional PIB Succinimide Type Engine Oil AdditivesThe physical and chemical properties of polyisobutylene (PIB) succinimide and polyisobutylene polysuccinimide type dispersants for engine oil have been studied. Differences in the enhancement or diminution of detergentdispersant, viscosityindex-improving, and antiwear effects were observed for different combinations of various functional additives and succinimide dispersants, depending on their chemical structure. Owing to the higher concentration of performance packages presently required for engine oils, the detrimental interactions of additives might increase, resulting in a reduction of the detergentdispersant, viscosity-index-improving, and antiwear efficiency, as well as unfavourable gelation processes. Fourier-transform infrared spectrometry, gel permeation chromatography, and bench tests for screening engine oil additives were used to determined relationships between the properties of lubricating oils and the composition of additives. The advantages of well balanced and selected succinimide combinations in a performance package with high detergendispersant efficiency were demonstrated.additives, PIB succinimide, dispersant, detergent-dispersant, viscosity index, antiwear During the last 40 years or so, many processes have been developed for the production of ashless dispersants for use as oil additives. A large family of succinimide additives for engine oils has been synthesised.' By changing the production process or the chemical structure of the additives, an increase in detergent-dispersant efficiency and resistance against chemical or mechanical stress have been achieved (Table 1, overleaf).

Synthesis, characterization, and evaluation of polyisobutylene‐based imido‐amine‐type dispersants containing exclusively non‐nucleophilic nitrogen

“…The TBN value of PIB-PzEA-phthalimide, 20.2, falls within the typical range for commercial PIBSI-based dispersants of similar molecular weight and dispersant concentration in finished oil 3,38,39 and was nearly twice that of the benchmark PIBSI dispersant at identical concentration in oil.…”

Molecular Science of Lubricant Additives

“…In contrast to wear particles of metallic materials, these oligomers and polymers are gel-like and are not easily filtered off. A dispersant molecule can interact with these organic contaminants and disperse in the liquid phase ( Figure 15) [84]. The primary function of dispersants is surfactant, which is analogous to detergent.…”

Is Carbon Black a Suitable Model Colloidal Substrate for Diesel Soot?

“…Jao et al reported that soot leads to engine wear via an abrasive wear mechanism. Moreover, the same workers showed that higher levels of abrasive contaminants within the oil inhibits boundary film formation. − This excessive build-up of soot particles in engine oil is highly undesirable because it accelerates engine wear, which ultimately leads to lower fuel efficiency and reduced engine lifetimes. − Fortunately, this soot-related wear problem can be mitigated by the addition of various copolymers to engine oil formulations. ,− Such copolymers can act as dispersants and confer steric stabilization, thus maximizing the degree of dispersion of the diesel soot. However, genuine diesel soot is prohibitively expensive for optimization studies because it can only be generated by running an engine over an extended period under suboptimal conditions.…”