Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Patent
1997-12-08
1999-12-28
McAvoy, Ellen M.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
508465, 252 77, 252 79, C10M12968
Patent
active
060081686
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an extreme pressure agent, a friction coefficient modifier, and functional fluids. More particularly, the present invention relates to an extreme pressure agent and a friction coefficient modifier which have excellent properties and are advantageously used for lubricating oil, metal working oil, and hydraulic oil, a fluid resistant to seizure under load and a wear resistant fluid which each comprises the above additive or the above modifier, and a flame resistant fluid which suppresses vaporization of flammable substances by thermal polymerization to prevent fire when the fluid is exposed to a high temperature, eliminates necessity for control of the content of water, facilitates handling and waste disposal, and is advantageously used as lubricating oil, metal working oil, hydraulic oil, washing oil, heat treatment oil, electric insulating oil, and grease.
BACKGROUND ART
Heretofore, lubricating oil is used in driving apparatuses and gears in internal combustion engines, automatic transmissions, dampers, and power steering gears for achieving smooth movement. However, it is known that the lubricating property is insufficient when the apparatuses and gears are used for achieving a high output under a large load. The surface of lubrication is worn out by friction, and seizure finally takes place. Therefore, lubricating oil containing an extreme pressure agent or a wear inhibitor is used. However, conventional extreme pressure agents have problems in that a sufficient effect for preventing seizure is not exhibited because of interaction with other additives, metals are corroded, and wear resistance is inferior, and are not always satisfactory.
As for oil used for metal working, such as cutting, grinding, and deformation processing, improvement in workability has been attempted by adding various types of oiliness improver or extreme pressure agent to mineral oil or synthetic hydrocarbon oil. For example, metal working oils prepared by adding an extreme pressure agent containing sulfur or chlorine to a base oil are commercially available. However, these metal working oils are not always satisfactory with respect to the life of tools and the efficiency of working represented by the precision of a finished surface of a processed material.
Therefore, development of an additive which exhibits the function of improving efficiency of working and decreasing wear of tools by forming a stronger lubricating film has been desired.
Moreover, when a working oil contains a large amount of an extreme pressure agent containing chlorine, there is the possibility that compounds causing environmental hazard (chlorine gas, dioxine, and the like) are formed when waste oil is disposed. Moreover, even when an extreme pressure agent containing sulfur is used, there is the possibility that environmental hazard is caused by the formation of SO.sub.x gas. Therefore, development of an extreme pressure agent which does not cause environmental hazard and has excellent properties has been desired.
A hydraulic fluid is a power transmission fluid which is used for transmission of power, control of force, and buffering in hydraulic systems, such as hydraulic devices and apparatuses, and also has the function of lubrication of sliding parts.
For such a hydraulic fluid, it is essential that the fluid has an excellent resistance to seizure under load and wear resistance as the fundamental properties. Therefore, these properties are provided by addition of an extreme pressure agent and a wear inhibitor to a base oil, such as mineral oil or synthetic oil. However, conventional extreme pressure agents are not always satisfactory in that the wear resistance is insufficient or corrosive wear takes place although the effect of preventing seizure under load is sufficiently exhibited.
For a hydraulic fluid, such as a fluid for traction drive, a relatively high friction coefficient is required in addition to the lubricating property. Therefore, development of an additive which can provide such a property
REFERENCES:
patent: 3873464 (1975-03-01), Bieber et al.
Abe Kazuaki
Takagi Fumiaki
Idemitsu Kosan Co. Ltd.
McAvoy Ellen M.
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