Lubricant

Details Lubricant Lubricant

1981-06-09

1983-08-02

Shine, W. J.

Compositions

Electrolytes for electrical devices

546243, 548476, 548545, 548548, C10M 120, C10M 132, C10M 134

Patent

active

043965164

DESCRIPTION:

BRIEF SUMMARY
FIELD OF TECHNOLOGY

This invention relates to a lubricant for use in sliding surfaces of non-ferrous materials, particularly non-ferrous metals such as aluminum, lead and copper and plastic materials.


BACKGROUND TECHNOLOGY

In recent years, in order to reduce the weight or cost of parts constituting machines or devices, crystalline plastics such as polytetrafluoroethylene, polyamides, polyethylene, polypropylene, polyacetal, polycarbonate and ABS and thermosetting plastics materials such as polydiallyl phthalate starting from phenol and polymides have come into widespread use in gears, especially those used in a geared motor, etc., bearings, especially roller bearings, cables for automobile speedometers, etc. These plastic materials have superior self-lubricating properties. Their properties are modified by forming composites of these materials, and they are used as sliding members in a dry condition. In order to improve their lubricating properties such as friction and wear, hitherto there have been used lubricating oils such as mineral oil-type lubricating oils, synthetic hydrocarbon oils and ester-type synthetic lubricating oils, and various lubricating greases containing the aforesaid oils as base oils. It has been desired, however, to develop a novel lubricant having a much lower coefficient of friction than the aforesaid conventional lubricants in order to prevent friction, noise, heat generation at frictional parts, etc.
The present inventors made extensive investigations, and consequently found that an imide compound obtained as the product of reaction between a dibasic acid selected from succinic acid, maleic acid, glutaric acid and phthalic acid or the anhydride thereof and a primary amine having a hydrocarbon radical with 8 to 18 carbon atoms exhibits low frictional properties on a sliding surface between non-ferrous materials and a sliding surface between a ferrous material and a non-ferrous material.


DISCLOSURE OF THE INVENTION

This invention is based on the aforesaid discovery. It is an object of this invention to provide a lubricant having improved lubricating properties such as reducing friction and wear in a sliding surface between the aforesaid non-ferrous materials. Another object of the invention is to provide a process which can make the aforesaid lubricant available industrially at low cost.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 attached shows curves of static torques and dynamic torques of ball joints 1 having sealed therein a lubricant F of this invention and a commercial grease B, respectively.
In FIG. 1, X and .rho. of the torque curves in the respective cases are as follows:


______________________________________ Static Static Dynamic oscil- rotat- oscillat- Dynamic lating ing ing rotating torque torque torque torque ______________________________________ Grease F of .sup.--X = 0.136 .sup.--X = 0.135 .sup.--X = 0.096 .sup.--X = 0.123 the invention .sigma. = 0.011 .sigma. = 0.012 .sigma. = 0.008 .sigma. = 0.012 Commercial .sup.--X = 0.478 .sup.--X = 0.316 .sup.--X = 0.144 .sup.--X = 0.134 grease B .sigma. = 0.034 .sigma. = 0.037 .sigma. = 0.015 .sigma. = 0.016 ______________________________________
FIG. 2 shows curves of static oscillating torques and dynamic oscillating torques of ball joints 2 having sealed therein the lubricant of the invention and commercial greases A and B, respectively.
In FIG. 2, X and .rho. of the torque curves in the respective cases are as follows: ______________________________________ Static Dynamic oscillating oscillating torque torque ______________________________________ Grease B of the .sup.--X = 0.503 .sup.--X = 0.291 invention .sigma. = 0.043 .sigma. = 0.025 Commercial .sup.--X = 1.217 .sup.--X = 0.347 grease A .sigma. = 0.076 .sigma. = 0.064 Commercial .sup.--X = 1.355 .sup.--X = 0.865 grease B .sigma. = 0.082 .sigma. = 0.048 ______________________________________
In FIGS. 1 and 2, the curves in the hatched areas show the dynamic torques; and the curves in

REFERENCES:
patent: 2594286 (1952-04-01), Bryant et al.
patent: 2669555 (1954-02-01), Giammaria
patent: 3219666 (1965-11-01), Norman et al.

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