Unlock instant, AI-driven research and patent intelligence for your innovation.

Lubricant compositions

a technology of compositions and lubricants, applied in the field of lubricating compositions, can solve the problems of increasing thin-film friction, high cost of additives, and dithiophosphate (zddp), and achieve the effect of reducing the thin-film friction of fluids

Inactive Publication Date: 2008-12-11
AFTON CHEMICAL
View PDF20 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]In another aspect, there is disclosed a method of reducing thin-film friction of a fluid between surfaces comprising providing to the fluid a composition comprising a base oil comprising less than about 3% by weight of tetracycloparaffins.

Problems solved by technology

Further, some additives, such as zinc dialkyl dithiophosphate (ZDDP) are known to increase thin-film friction.
However, it is also known that some additives are very expensive.
And, the use of additional amounts of an additive to a lubricant composition to reduce thin-film friction can be quite costly to the manufacturer.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lubricant compositions
  • Lubricant compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1

Base Oils

[0108]It is known in the industry that Group II base oils comprise more than 90% saturates, less than 0.03% sulfur, and have a viscosity index from about 80 to about 120. However, not all Group II base oils have the same thin-film frictional properties. The base oils in Table 1 were analyzed according to the procedure in Analytical Chemistry, 64:2227 (1992), the disclosure of which is hereby incorporated by reference, in order to determine the type of paraffins, cycloparaffins, and aromatics in the oil.

[0109]The thin-film friction coefficient of various known base oils (three Group II base oils and a PAO) was measured at 100° C. / 20N load with a 20% slide to roll ratio at 1.5 m / s.

TABLE 1%BaseThin-Film FrictionKinematic ViscosityTetracycloparaffinsOilsCoefficientat 100° C.in Base OilA0.0664.05 cSt3.33B0.0444.60 cSt1.48C0.0304.09 cSt1.57PAO0.0274.00 cSt0.00

[0110]As shown in Table 1, a base oil A and a base oil C have similar kinematic viscosities, but base oil A has a higher t...

example 2

Base Oils and Phosphorus-Containing Compounds

[0112]SAE 2000-01-2030 shows that phosphorus-containing compounds form films on surfaces that result in an increase in thin-film friction. For example, zinc dialkyl dithiophosphate (ZDDP) can cause thin-film friction to increase. ZDDP is the most common phosphorus-containing compound found in engine oils.

[0113]Various phosphorus-containing compounds were combined / mixed / blended with each of base oil A (a base oil having 3.33% tetracycloparaffins) and base oil C (a base oil having less than about 3% tetracycloparaffins) and their thin-film friction coefficient was measured as described in Example 1.

TABLE 2BASE OIL ABASE OIL C+1% ZDDP0.0970.074+0.4% AAP0.0400.034+1% S-NPGP0.0690.066+0.4% phosphonate0.0550.035

[0114]The results show that thin film friction is lower in base oils comprising less than about 3% by weight of tetracycloparaffins. Moreover, the results show that thin film friction can be lowered even more depending upon the phosphoru...

example 3

Combinations of Additives in a Base Oil

[0115]It has been reported that when a full complement of additives, such as dispersants, detergents, anti-wear agents, and / or antioxidants is added to an oil the thin-film friction increases. See M. T. Devlin, T. Hammock, and T- C, Jao, “Effect of Mechanical Shear on the Thin Film Properties of Base Oil / Polymer Mixtures”, Lubrication Science Vol. 14 (2), 2002, the disclosure of which is hereby incorporated by reference. Various combinations of additives were combined / mixed / blended with each of base oil A and base oil C to determine their thin-film friction coefficient. In the lubricant compositions the ZDDP contained about 500 ppm of phosphorus, and the molybdenum-containing friction modifier compound contained about 480 ppm of molybdenum. Moreover, when the glycerol monooleate was present in the additive package, it was added at 0.60% weight. Similarly, when the dispersant was present in the additive package, it was added at 3.0% weight. The ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A lubricant composition comprising a base oil comprising less than about 3% by weight of tetracycloparaffins is disclosed. Methods of making and using the lubricant composition are also disclosed.

Description

DESCRIPTION OF THE DISCLOSURE[0001]1. Field of the Disclosure[0002]The present disclosure relates to lubricating compositions comprising a base oil comprising less than about 3% by weight of tetracycloparaffins.[0003]2. Background of the Disclosure[0004]In recent years-there has been growing concern to produce energy-efficient lubricated components. Moreover, modem engine oil specifications require lubricants to demonstrate fuel efficiency in standardized engine tests. The thickness and frictional characteristics of thin lubricant films are known to affect the fuel economy properties of oils.[0005]Thin-film friction is the friction generated from fluid, such as a lubricant, pushing between two surfaces, wherein the distance between the two surfaces is very narrow. It is known that different additives normally present in a lubricant composition form films of different thicknesses, which can have an effect on thin-film friction. Moreover, some additives have a narrow range of conditio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C10M169/04C10M141/10
CPCC10M101/02C10M169/044C10M2203/1025C10M2205/022C10M2205/0285C10M2207/289C10M2209/102C10M2215/28C10M2217/043C10M2219/068C10M2223/045C10N2210/06C10N2220/025C10N2230/06C10N2230/54C10N2240/04C10N2240/10C10M2205/024C10N2260/14C10N2210/02C10N2010/12C10N2020/065C10N2030/06C10N2030/54C10N2040/04C10N2040/25C10N2010/04C10N2060/14
Inventor DEVLIN, MARK T.JAO, TZE-CHILOPER, JOHN T.SHEETS, ROGER M.GUINTHER, GREGORY H.
Owner AFTON CHEMICAL