EP1121403A1 - Catalyzed lubricant additives and catalyzed lubricant systems designed to accelerate the lubricant bonding reaction - Google Patents
Catalyzed lubricant additives and catalyzed lubricant systems designed to accelerate the lubricant bonding reactionInfo
- Publication number
- EP1121403A1 EP1121403A1 EP98938236A EP98938236A EP1121403A1 EP 1121403 A1 EP1121403 A1 EP 1121403A1 EP 98938236 A EP98938236 A EP 98938236A EP 98938236 A EP98938236 A EP 98938236A EP 1121403 A1 EP1121403 A1 EP 1121403A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lubricant
- base
- catalytic
- composition
- catalyst
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Definitions
- This invention relates to the fields of lubricants, catalysis, organic, and inorganic chemistry, and more particularly, this invention relates to novel catalyzed lubricant additives and catalyzed lubricant systems, which contain one or more catalysts, wherein the catalysts serve to accelerate the rate and increase the yield of the lubricant bonding reactions between the catalyzed lubricants and the wear surfaces being lubricated.
- hydrodynamic lubrication In those instances where the liquid or semisolid film is constantly maintained on the wear surfaces, while the mechanisms being lubricated are in operation, the lubrication regime is referred to as "hydrodynamic lubrication.” Hydrodynamic lubrication with properly designed lubricant systems can provide very reliable wear protection for the lubricated wear surfaces. However, in order to achieve a high level of reliability, the liquid or semisolid lubricant film must remain interposed, continuous, and of sufficient thickness between the adjacent wear surfaces, so that direct contact of the wear surfaces is prevented, or-at least minimized. The appropriate design of the liquid or semisolid lubricants in providing wear protection will be predicated upon the duty with which the lubricants must contend. The duty may be determined as a function of the adjacent wear surface materials, clearances, the load imposed on the wear surfaces, the relative speed of the wear surfaces, temperatures, pressures, and other related environmental conditions.
- boundary period The period that exists following the initial relative movement of the wear surfaces, and prior to the establishment of hydrodynamic lubrication, is referred to as the "boundary period,” and the lubrication characteristics that exist during this period are referred to as “boundary lubrication.”
- boundary is a term of art in the mechanism and lubrication design fields handed down from an old-time British researcher who once studied journal bearings.
- boundary lubrication which has its roots in the study conducted by this British researcher, has been used within the Lubrication Industry ever since that time. The term is used to denote the character of lubrication that takes place with respect to adjacent wear surfaces in the time period from start-up until the time at which a continuous film of lubricant is established to effect hydrodynamic lubrication.
- Boundary lubrication frequently is also associated with mechanisms which are subject to acceleration, including the acceleration due to the abrupt and rapid change of direction while in operation.
- boundary lubrication is often times used to refer to a regime of lubrication that is not entirely hydrodynamic.
- the goal of appropriately designed mechanisms, and the programs designed to lubricate those mechanisms is to establish and maintain a lubricant film between the adjacent wear surfaces of sufficient thickness so as to avoid or at least mimmize the contact between the wear surfaces. In addition, it is the goal to minimize the energy required to move the adjacent wear surfaces in the environment of the lubricants.
- These goals are presently best achieved in the hydrodynamic regime of lubrication by those skilled in the arts of mechanism and lubrication design, by employing lubricants with the lowest possible viscosity permissible, wherein the separation of the adjacent wear surfaces is continuously or satisfactorily maintained.
- all mechanisms requiring lubrication cannot be designed so that they are maintained in a hydrodynamic lubrication regime.
- the state of the lubrication art would mandate the use of the lowest possible viscosity liquid lubricants, that would allow the adjacent wear surfaces to hydroplane past one another, avoiding all direct contact.
- the relatively low viscosity liquid lubricants are known to be inadequate, without other additives, to also mimmize the mechanisms' rates of wear.
- the present state of the art solution to this lubrication dichotomy is to employ relatively low viscosity liquid lubricants with solid lubricants suspended therein, or preferably with finely divided solid lubricant particles combined with liquid or semisolid lubricant bases, and do so in such a manner as to create colloidal systems, stable under all operating conditions.
- solid lubricants which distinguish themselves by virtue of their relatively low coefficients of friction along with their special structural or special chemical characteristics, or both.
- Other solid lubricants such as the various organic polymers, compounds of ethers, compounds of fatty acids and carbon, calcium, barium and lithium fluorides also exhibit relatively low coefficients of friction.
- solid lubricants generally are less influenced than liquid lubricants by the adverse effects of temperature changes, in that they tend to not readily drain or be thrown from the wear surfaces being lubricated.
- solid lubricants are adsorbed, absorbed, or chemically bonded to the wear surface, frequently providing satisfactory lubrication when and where liquid lubricants alone would not do so.
- the appropriately designed lubricant systems containing solid lubricants, shall have the solid lubricants evenly distributed throughout the lubricant base media, again, preferably in stable colloidal systems, and the solid particles shall be sufficiently small as to pass readily through all of the lubrication galleries and filters, and easily gain entry to all of the interstices of the mechanisms, which the lubricant systems are designed to lubricate.
- the solid lubricants generally employed as additives to liquid or semisolid base lubricants commonly pass through a series of steps whereby they are first adsorbed on the wear surfaces of the mechanisms being lubricated. Thereafter, the solid lubricants are generally absorbed within the wear surfaces, and in some cases the solid lubricants ultimately react and chemically bond to the wear surfaces to form persistent, durable films, which exhibit relatively low coefficients of friction. These three steps are deemed to be part of the comprehensive bonding reaction herein. At such time as the solid lubricants have bonded to the wear surfaces, they are expected to provide adequate lubrication during boundary lubrication periods, sufficient to prevent or reduce wear.
- solid lubricants presently in service and/or proposed for service are: polytetrafluoroethylene (PTFE); Teflon ® (PTFE); perfluoropolyether oxide; ethylene polymers; propylene polymers; fluorophenylene polymers; perfluoropolyether; polyol monoesters of fatty acids; amides of fatty acids; sulfurized fats and esters; molybdenum sulfur compounds; metallic soaps of fatty acids; graphite; carbon fluoride; carbon fluoride chloride; barium fluoride; calcium fluoride; and lithium fluoride.
- PTFE polytetrafluoroethylene
- Teflon ® PTFE
- perfluoropolyether oxide ethylene polymers
- propylene polymers fluorophenylene polymers
- perfluoropolyether polyol monoesters of fatty acids
- amides of fatty acids sulfurized fats and esters
- molybdenum sulfur compounds metallic soaps of
- solid lubricants can be divided conveniently into two groups: unbonded solid lubricants and bonded solid lubricants.
- the unbonded solid lubricants are sometimes directly applied to the surfaces to be lubricated, usually in the form of a powder, and adhere thereto by some degree of mechanical or molecular action.
- the solid lubricants in this category are, by definition, not physically or chemically bonded to the surfaces being treated in such a manner.
- the properties of the solid lubricants and the fact that they are adherent but unbonded will generally serve to define the performance characteristics for any specific application. Since there is no bonding of the solid lubricants to the surfaces, in the case of unbonded solid lubricants, the potential exists, particularly in load .bearing applications, that such lubricants will be extruded from between the adjacent load-bearing wear surfaces and will not remain in position to provide the desired lubrication performance for any significant period of time. For this reason unbonded solid lubricants are considered to be useful for only nonload-bearing applications or applications where "non-stick" properties are being sought, for example cookware surfaces, cling, and stain resistant surfaces, etc.
- the bonded solid lubricants are, by the definition employed herein, attached to the desired wear surfaces, generally by virtue of first adsorption, then absorption, followed thereafter by a chemical bond between the solid lubricants and the wear surfaces.
- the bonding often times can be effected and accelerated, or both, by the use of adhesives, binders, elevated temperatures, and other materials and techniques in appropriate applications.
- Generally bonded solid lubricants will present different lubrication characteristics, than those lubrication characteristics exhibited by the same solid lubricants prior to the bonding reactions. However, once the bonded lubricants are firmly affixed to the wear surfaces, they will be more persistent and much less likely to be displaced under load-bearing conditions than the unbonded lubricants.
- the bonded solid lubricants in almost every case, will present a bonded interface with the lubricated wear surfaces, which will be very shallow, and as a consequence, the bonded lubricants will tend to disappear as the surfaces are subjected to unavoidable wear action, if the solid lubricants are not otherwise continuously replenished. Irrespective of the mode of lubrication, it is easy to recognize that even under the best of conditions some wear is likely to take place with respect to adjacent wear surfaces, within the present state of the mechanism and lubrication design arts.
- PTFE polytetrafluoroethylene
- U.S. Patent Number 2,230,654 is polytetrafluoroethylene
- PTFE polytetrafluoroethylene
- PTFE is highly resistant to most forms of chemical attack. Based on the research work disclosed by L. L. Cao, et al. in the reference cited earlier, it was determined that metallic wear surfaces treated with PTFE resulted in a bonded lubrication film that could be qualitatively divided into four layers, including the outermost layer of PTFE.
- the outermost or first layer was composed of a film of PTFE.
- the second layer was composed of a mixed reaction film, containing a mixture of the chemical structures shown as Items 2, 3, and 4 above.
- the third layer exhibited a chemical structure in which there was a paucity of fluorine with respect to the second layer.
- the deepest layer consisted primarily of ferrous and ferric fluoride, along with some microparticles of PTFE. It is evident from the binding energy figures that each of the bonded layers was tigh ⁇ ly bound, with the outermost layer exhibiting the greatest binding energy.
- the innermost layer, or the fourth layer was clearly reacted and had become part of the metallic matrix, even though its binding energy was determined to be slightly less than the other three layers.
- boundary lubrication such as that experienced by the engine piston rings
- the wear surfaces are exposed to direct metal-to-metal contact and hence the rate of wear shall be very dependent upon the presence or absence of the appropriate lubricant at the points of potential contact.
- Realization of the manner in which lubricants function in a typical engine, and/or other mechanisms having adjacent wear surfaces, serves to emphasize the need for improved lubricant systems to enhance boundary lubrication, and consequently to reduce drag and mitigate wear.
- the contemporary state of the art lubricant system using PTFE is dependent on the adherence of the PTFE on the lubricated wear surfaces, followed thereafter by metal-to-metal contact of the asperities to generate exceedingly high localized temperatures. These exceedingly high localized temperatures are deemed to be required to promote a chemical bonding reaction between the PTFE and the metallic wear surfaces being lubricated.
- the obvious shortcoming of this process is that the metal-to-metal contact relied upon to generate the necessary localized high temperatures deemed necessary to promote the bonding reaction, is the same metal-to-metal contact which serves to physically diminish and remove any preexisting lubricant film.
- the novel approach to achieving such improved performance is by adding one or more appropriately designed catalysts to the lubricant systems.
- the inclusion of one or more effective catalysts in the lubricant systems will serve to increase the yield of bonded lubricant film and to accelerate the bonding reactions between the wear surfaces and the solid lubricant additives, without the prerequisite of the high localized temperature. Therefore, the solid lubricant to wear surface bonding reactions may proceed under ambient conditions so that the lubricant film will rapidly form to "heal" newly exposed wear surface areas.
- the resultant lubricant film will thicken to the point where further metal-to-metal contact will no longer occur. It is reasonable to expect that appropriately designed catalyzed lubricant additives and/or catalyzed lubricant systems will produce a bonded lubricant film in the time the lubricated mechanism requires to make a single cycle. With the addition of an appropriately designed catalyst or catalysts to the lubricant systems containing PTFE or other effective, bondable, solid lubricant additives, it is reasonable to expect that the lubricated wear surfaces will approach full time wear protection, with a rate of wear reduction approaching 100%.
- the novel solution to this problem is as stated above, and that is to provide appropriate additives to the lubricant systems, which will continuously function within the systems, and will act to rapidly initiate and complete the lubricant bonding reaction on all of the wear surfaces not otherwise fully bonded.
- the appropriate additives are catalysts that will accelerate the bonding reactions, increase the reaction yields, and be available in the lubrication system at all times.
- Catalysis was coined by Berzelius in 1835, at which time he provided the following definition for catalysts: "Catalysts are substances which by their mere presence evoke chemical reactions that would not otherwise take place.”
- Wilhelm Ostwald later offered what has become the present day accepted definition for catalysts, "Catalysts are substances that change the velocity of a chemical reaction without themselves appearing in the end products.” It is noteworthy that in many applications a mere trace of catalyst suffices to produce great changes without itself being changed in the final analysis. For example, U.S.
- Patent Number 2,230,654 for the invention of polytetrafluoroethylene (PTFE), disclosed in Example II of the patent that: "Tetrafluoroethylene (7.8 parts) was placed in a container under pressure at 20° C. The yield of polymer after 21 days was 0.05 parts or 0.64%.” Later the patent disclosed in Example VIII the results wherein a catalyst in the form of silver nitrate along with methyl alcohol were introduced, as follows: "Tetrafluoroethylene (4.5 parts) was introduced in a container with 0.1 part silver nitrate and 2.2 parts of methyl alcohol under pressures at 25° C. Polymerization began immediately with the formation of a jelly like mass. In three days this had solidified to a brown powder which had properties similar to those of the white polymer.
- PTFE polytetrafluoroethylene
- Example VIII The yield was 1.3 parts or 29%.
- the inclusion of the methyl alcohol and the increased temperature of 5° C. in Example VIII compared to Example II may have had a slight influence on the improved results; however, the major factor causing the reaction rate to accelerate and the yield to increase from 0.64% to 29%o in only three days, rather than 21 days, was clearly the introduction of the catalyst into the reaction environment.
- Catalysts may be of any composition and may be of any phase (i.e. solid, liquid, or gaseous). Catalysts that are of the same phase as the reactants are termed "homogeneous,” and catalysts that are of a different phase than the reactants are referred to as "heterogeneous.”
- the present invention consists of novel concepts, complete with a group of formulations for catalyzed lubricant additives, and for catalyzed lubricant systems.
- the catalyzed lubricant additives of this invention are comprised of items 1 and 2 below, and one or more of the remaining numbered items, presented as follows:
- catalysts consist of one or more transition elements, and/or one or more compounds, in which one or more transition elements are included,
- any number of additives 5. Any number of additives, wherein one or more of the additives are solid lubricants, 6. Any number of additives, wherein one or more of the additives are selected from the group consisting of PTFE, other polymers, ethers, fatty acid compounds, molybdenum compounds, metallic soaps, graphite, carbon halogens, barium fluoride, calcium fluoride, and lithium fluoride, 7. One or more halogen elements, or any combination of halogen elements, and/or one or more compounds in which halogen elements are included, and 8. One or more catalysts, where such catalysts are homogeneous, heterogeneous, or any - combination of homogeneous and heterogeneous catalysts.
- the catalyzed lubricant systems of this invention are comprised of the catalyzed lubricant additives of this invention included in any base lubricant.
- An object of this invention is to establish and restore the protective lubricant film on lubricated wear surfaces as rapidly as possible, thereby preventing or minimizing the opportunity for the adjacent wear surfaces to come into contact with one another.
- An object of this invention is to provide one or more novel additives, specifically including catalysts, for use as admixes with base lubricants, in particular base lubricants comprised of liquid or semisolid base materials, with solid lubricant materials included therein, wherein the additives are designed to accelerate the rate of the bonding reaction and increase the yield of the bonding reaction between the catalyzed lubricants and the wear surfaces being lubricated with the above described lubricant systems.
- An object of this invention is to define the composition of a group of catalysts for use as lubricant additives, as cited above, as one or more transition elements, or one or more compounds in which transition elements are included, or any combination of transition elements and transition element compounds, where the transition elements are identified as those elements bearing atomic numbers 21 through 31, 39 through 49, and 71 through 81, all inclusive.
- An object of this invention is to define the ingredients for various catalytic lubricant additives and various catalytic lubricant systems wherein the ingredients include conventional mineral oil or grease, or synthetic oil or grease, or any other base lubricant, whether or not such lubricants have been presently disclosed, and with the catalyst additives cited above.
- An object of this invention is to include additional lubricant system additives, which additives are designed to improve and enhance the catalyzed lubricant system to which they are admixed.
- An object of this invention is to include one or more of the halogen elements and/or compounds in which halogen elements are included, to function as starters and to contribute to the mass effect of the catalyzed lubricant bonding reactions and resultant lubricant film formation.
- one of the most effective solid lubricant additives for general lubrication purposes is PTFE.
- one of the preferred embodiments of this invention is a catalyzed lubricant additive which contains PTFE and has the following formulation.
- Colloidal Particles are defined as particles having diameters ranging from 1 micrometer to 1 nanometer.
- a “Stable Colloidal System” is defined as a system composed of colloidal particles dispersed in some medium, wherein the particles remain suspended because the force due to gravity is offset by the kinetic energy or "brownian movement" inherent in the system,
- the first reaction that will occur in the development of the lubricant film is the severance of some of the fluorine-carbon bonds with respect to the PTFE. Thereafter, it is postulated that the fluorine radicals will attach to the lubricated wear surface, which in the case analyzed by L.
- FeF 2 + F 0 platinum & palladium ⁇ FeF 3 ferrous flouride fluorine catalyst ferric fluoride
- reaction products could be as shown, or could be one or a combination of reaction products selected from a group consisting of the following:
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1998/016013 WO2000006674A1 (en) | 1996-04-26 | 1998-07-31 | Catalyzed lubricant additives and catalyzed lubricant systems designed to accelerate the lubricant bonding reaction |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1121403A1 true EP1121403A1 (en) | 2001-08-08 |
EP1121403A4 EP1121403A4 (en) | 2003-04-09 |
Family
ID=22267614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98938236A Withdrawn EP1121403A4 (en) | 1998-07-31 | 1998-07-31 | Catalyzed lubricant additives and catalyzed lubricant systems designed to accelerate the lubricant bonding reaction |
Country Status (3)
Country | Link |
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EP (1) | EP1121403A4 (en) |
JP (1) | JP2002521554A (en) |
CA (1) | CA2338590A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3003937A (en) * | 1956-07-25 | 1961-10-10 | Exxon Research Engineering Co | Lubricants |
US4127491A (en) * | 1976-07-23 | 1978-11-28 | Michael Ebert | Hybrid lubricant including halocarbon oil |
EP0336629A1 (en) * | 1988-03-28 | 1989-10-11 | Exxon Research And Engineering Company | Polymer-stabilized colloidal metal solution |
US5116900A (en) * | 1990-02-13 | 1992-05-26 | Owens-Corning Fiberglas Corporation | Coating composition for fibers |
US5227081A (en) * | 1991-02-22 | 1993-07-13 | Dow Corning Toray Silicone Co., Ltd. | Silicone grease composition and method for preparing same |
US5650380A (en) * | 1995-07-11 | 1997-07-22 | Shell Oil Company | Lubricating grease |
-
1998
- 1998-07-31 EP EP98938236A patent/EP1121403A4/en not_active Withdrawn
- 1998-07-31 CA CA002338590A patent/CA2338590A1/en not_active Abandoned
- 1998-07-31 JP JP2000562458A patent/JP2002521554A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3003937A (en) * | 1956-07-25 | 1961-10-10 | Exxon Research Engineering Co | Lubricants |
US4127491A (en) * | 1976-07-23 | 1978-11-28 | Michael Ebert | Hybrid lubricant including halocarbon oil |
EP0336629A1 (en) * | 1988-03-28 | 1989-10-11 | Exxon Research And Engineering Company | Polymer-stabilized colloidal metal solution |
US5116900A (en) * | 1990-02-13 | 1992-05-26 | Owens-Corning Fiberglas Corporation | Coating composition for fibers |
US5227081A (en) * | 1991-02-22 | 1993-07-13 | Dow Corning Toray Silicone Co., Ltd. | Silicone grease composition and method for preparing same |
US5650380A (en) * | 1995-07-11 | 1997-07-22 | Shell Oil Company | Lubricating grease |
Non-Patent Citations (1)
Title |
---|
See also references of WO0006674A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2002521554A (en) | 2002-07-16 |
CA2338590A1 (en) | 2000-02-10 |
EP1121403A4 (en) | 2003-04-09 |
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