An Efficient Catalyst for Esterification of Biodegradable Polyol Ester Lubricants

Increasing environmental awareness and regulations have accelerated the developmental activity of rapid biodegradable lubricants in some part of the globe in last few years. Biodegradable products carry a significant price premium over conventional mineral oils. Ester based products are generally compatible with most construction materials, and also used as environmentally acceptable t1uids in high performance lubricants. Polyol esters are gaining importance because of their inherent good oxidation, better thern;tal stability and low volatility prop~rties as compared to mineral oils. Coupled with their higher t1ash point and auto-ignition temperature; low order of toxicity for vapor inhalation, ingestion and skin irritation along with high biodegradability, these are safe for lubricant formulations with lesser impact on environment. Ion exchange resins are found to be efficient catalyst for the synthesis of various types of biodegradable/ecofriendly esters. The physicio-chemical properties of the esters synthesized from 2,2-dimethyll,3-propane diol, 2,2-diethyll,3-propane diol,l,l,l-tris hydroxy methyl propane and C5-C10 dicarboxylic acids with mono alcohol have been determined to evaluate their suitability as synthetic lubricating oil base stocks. The paper highlights the results of these complex esters

Study of synthetic complex esters as automotive gear lubricants

A number of di- and triol-centered polyols such as 2, 2-dimethyl-l, 3-propane diol, 2, 2-diethyl-l, 3-propane diol and I, I, l-tris hydroxy methyl propane complex/esters have been synthesized using di-carboxylic acids like adipic and sebacic acids (CoClO) and 2-ethyll-hexanol with indigenous ion-exchange resin (Indion-130) catalys( The applicability of these esters 'as automotive gear lubricants has been evaluated. The products were found to be compatible with extreme pressure additives. In addition, the products are readily biodegradable. Copyright @ 2008 John Wiley & Sons, Ltd

DEVELOPMENT OF MULTIPURPOSE ENVIRONMENT FRIENDLY LUBRICATING GREASE

The paper reports the work carried on the development of multipurpose grease using vegetable oil and a by-product (residual oil). This includes formulations and relevant tribological performance parameters. The studies resulted in two potential candidates as multipurpose grease formulations

Study of synthesised ecofriendly and biodegradable esters fire resistance and lubricating properties

Biodegradable esters have been synthesised using Polyols such as 2-methyl-2-n-propyl l,3-propane diol, 2,2-di methyl 1,3-propane diol, 1,1,1-[tris] hydroxyl methyl propane, 1,1,1-[tris] hydroxyl methyl ethane and carboxylic acids (C6-CI2) both pure and their mixtures with indigenous ion exchange resin (lndion- 130) catalyst. The products were characterised for their physico-chemical properties and were evaluated for their lubrication performance. These were then compared with VG-22 grade fire resistant hydraulic fluids (FRHFs).The products were found to have good potential for use as a base stock for formulations as FRHF of VG-22 grade. Copyright © 20l 0 John Wiley & Sons, Ltd

SYNTHETIC POLYOL ESTERS: POTENTIAL BASE STOCKS FOR THEIR USE IN DEVELOPMENT OF ECO-FRIENDL Y CUTTING OILS

Today's metal working lubricants referred to cutting or grinding fluids are for different from those considered to be the ultimate in performance only few years ago. As nowadays advancement of technology and awareness has led to find eco-friendly and better performance products for use. Synthetic esters are used as environment~lIy acceptable fluids in high performance lubricants as having a very good low temperature behavior, high thermo oxidative stability of some types, very high VI, good anti-wear and low evaporation properties. In recent past, esters have been used successfully in lubrication and are the preferred base stocks in many severe applications. As synthetic polyol esters have excellent cooling properties, low viscosity and they present no rancidity problem. Keeping this in view polyol esters from polyol (Cs) and mono carboxyl acids (C8-C9) were synthesized and characterized for their physico-chemical and lubricity properties. Some of the polyol esters were found to be suitable base stocks for neat cutting oil. The paper highlights the results of the studies

DEVELOPMENTOF ENVIRONMENTALLY SAFE SYNTHETIC BASE FLUIDS

Industrial users have began to appreciate that synthetic lubricants notably those based upon esters (di- and polyol) and poly alkylene glycols provide cost effective lubrication in all service conditions. From an environmental point of view i.e. rapid biodegradability and favourable ecotoxicological characteristics, a selection must be made which combines these favourable characteristics at an acceptable price. A simple cost effective, eco-friendly, efficient process using indigenous catalyst has been developed for the synthesis of diester and polyolester base stocks. All the base fluids synthesized have low pour point, <-27 in most of the cases. Based on viscosity index, majority, of these products belong to group III category except five products, which belong to group II category of base oils as per API classifications. Biodegradability of some potential lube base stocks has been assessed by ATSM-D5864 method. On the basis of the product properties, these base fluids may find applications either alone or in blends for automotive lubricants, hydraulic oils and refrigeration oils.