Study of Novel Ecofriendly Multifunctional Lube Additives Based on Pentaerythritol Phenolic Ester

Abstract

The concept of an “ecofriendly lubricant” has drawn much attention due to environmental issues related to conventional lubricants. Mere innovations in lube base oils are not enough. The introduction of new ecofriendly additives is also necessary to address such issues. Therefore, there is a need for the development of new multifunctional additives (MFA) that are environmentally benign. In view of this, the mixed esters of pentaerythritol monooleate with gallic acid (additive 1) and 3,5-di-tert-butyl-4-hydroxybenzoic acid (additive 2) have been synthesized. Both additives 1 and 2 were characterized by FT-IR, NMR, TG, and CHNS analyses. They were evaluated for antioxidant and detergent dispersant along with lubricity properties using the rotary bomb oxidation test, blotter spot test, and four ball test. The thermo-oxidative stability of the base oil was found to increase significantly in the presence of additives 1 and 2 at 3000 ppm concentration. The antioxidant, detergent dispersant, and lubricity properties of additive 1 have been found to be better than those of additive 2.

Gel-Like Dispersions of HMDI-Cross-Linked Lignocellulosic Materials in Castor Oil: Toward Completely Renewable Lubricating Grease Formulations

“…[6][7][8] Moreover, despite that additives are usually included in small proportions, special attention has been also paid on the development of green multifunctional additives for lubricant formulations in order to improve specific properties of vegetable oil-derived base oils, such as viscosity index, pour point, thermo-oxidative stability, lubricity, anti-wear and detergent dispersant capacity. [9][10][11][12][13][14][15] Therefore, a wide range of alternatives to design efficient liquid lubricant products completely based on renewable resources are available in the existing literature. A major complexity involves the formulation of semi-solid lubricants, i.e.…”

Efficiency of Dodecenylsuccinic Amide of n‐Phenyl‐p‐Phenylenediammine as Novel Multifunctional Lubricant Additive for Deposit Control and Lubricity

“…Recently, some efforts were also made by our group for example, mixed esters of pentaerythritol monooleate with gallic acid and 3,5‐di‐tert‐butyl‐4‐hydroxybenzoic acid have been evaluated for antioxidant, detergent dispersant along with excellent lubricity properties (Singh et al, 2014a, b). Acylated chitosan Schiff bases with 3,5‐di‐tert‐butyl‐4‐hydroxybenzaldehyde were evaluated as multifunctional additives with antioxidants and lubricity properties along with a screening of corrosion behavior in bio lubricant base oil (N‐butyl palmitate/stearate) (Singh et al, 2014a, b). Ca salts of histidine Schiff base esters were evaluated as the detergent dispersant, the antioxidant and antiwear multifunctional additive in polyol base oil (Singh et al, 2015a, b).…”

Multifunctional lubricant additive based on difluoroboron derivatives of a diphenylamine antioxidant

“…6 Therefore, it is a progressive trend to develop new non-SAPS or low SAPS multifunctional lubricant additives without reducing the antioxidation and antiwear capabilities. [7][8][9] Several kinds of compounds with low or zero SAPS has been studied, such as heterocyclic compounds, [10][11][12] boron containing compounds, [13][14][15] ionic liquids 16,17 and nanoparticles. [18][19][20] It is well known that antioxidants can improve the oxidation stability of lubricant.…”