SOLID ANTI-GALLING AGENT
The invention pertains to the art of lubricants, and more particularly to anti-galling compounds for bearing or threaded objects that are subjected to elevated temperatures. BACKGROUND OF THE INVENTION Anti-galling compositions containing solid lubricants such as nickel and graphite are well known in the art as useful on various metal surfaces at elevated temperatures. These compositions are generally oil based and tend to migrate once applied, thus creating imprecise application and inconvenient and messy handling. Because these compositions tend to migrate, they often come in contact with areas of a part which should be kept free of lubricating materials. The use of these compositions on numerous applications where cleanliness, precision and speed are required, is precluded due to their unmanageable nature. In many other types of applications, the lubricating process becomes very time consuming and tedious to minimize the migration of the composition to undesired regions on a part.
The oil based compounds are also inconvenient to store, use and apply. The oil based compounds are liquid compounds that are inconvenient and messy to apply to a component in a desired amount. The liquid components of the oil based compound also tend to settle and separate out over time thereby requiring the liquid compound to be throughly mixed prior to use. The component separation can also lead to the liquid compound prematurely drying in its container thereby making the compound unusable. In addition, the compound cannot be applied to an apparatus or device that is hot, thus requiring extended down time for cooling prior to application. In addition, the oil components can flash when exposed to high temperature environments. The oil based compounds must be properly sealed to prevent them from prematurely drying and becoming unusable. The liquid compounds also require a brush to apply the compounds to a part. After application of the liquid compound, the brush or applicator must be cleaned or be deposed of, thereby increasing the time and/or cost of using such compounds.
Other prior art dry lubricants have been developed in conjunction with electrolytic plating techniques. For example, United States Patent No. 3,756,925 to Takeuchi et al. describes a dry lubricant coating comprising a graphite fluoride powder which is treated with a dispersion promoter, and then immersed in a metal plating bath. The graphite fluoride
dispersion is deposited electrolytically onto a surface as a lubricative coating. United States Patent No. 4,409,111 to Holmes et al. describes a lubricant coating comprising graphite powder or metal powder suspended in an aqueous polymeric binder. The polymeric binder is formulated to rapidly dry thereby securing the lubricating powders in position on a part. Once the binder dries, the lubricated part can then be secured to an apparatus or device. Although both of these lubricants reduce migration problems associated with traditional lubricants, the lubricants require special application procedures prior to use, thus reducing the versatility of such compounds and increasing the cost of using such compounds.
In view of the existing anti-galling compounds, there is a need for an anti-galling compound that is easy and convenient to use, is easy to store, has great versatility of use, is essentially non-migratory after application, and can be used in high temperature applications.
SUMMARY OF THE INVENTION The present invention relates to an improved lubricant for various types of surfaces, and more particularly, to an improved anti-galling agent which provides a non-migratory coating to metal surfaces to reduce two or more metal surfaces from seizing or sticking together. The improved lubricant has particular application to machinery, both commercial and non-commercial, and to outdoor equipment, such as firearms, bicycles, automotive, and camping equipment, which include threaded, geared and/or bearing components. In accordance with the invention, there is provided an anti-galling compound which includes an anti-seize agent and a wax carrier. The anti-seize agent includes particles that have a relatively high melting point. The anti-seize agent is designed to provide lubrication and/or prevent galling of components exposed to high temperatures and/or high pressures. High temperature is defined as a temperature over 700 °F. The wax carrier is formulated to be mixed with the anti-seize agent to form a generally homogeneous mixture. The type and amount of wax carrier is selected to form a homogeneous mixture that is substantially solid at least at ambient temperature (i.e 60-80 °F). The solid form of the anti-galling agent enhances the ease and versatility of use of the anti-galling agent. The solid anti-galling agent can be directly applied to a part without need of a brush or special applicator. The solid anti-galling agent also reduces or eliminates migratory problems of the agent after
application. The solid anti-galling agent does not significantly flow from its point of application thereby reducing the handling problems and contamination of adjacent components. The anti-galling agent is formulated to not grossly affect the torque on threaded components or to grossly affect the friction on a bearing surface. The wax carrier content of the anti-galling agent is preferably about 10-95%, more preferably about 10-70%, and even more preferably about 15-25%. The anti-seize agent content of the anti-galling agent is preferably about 5-90%, more preferably about 20-80%, and even more preferably about 45-65%. The wax carrier preferably has several functions. The principal function of the wax carrier is to act as a carrier for the anti-seize. Other functions of the wax carrier include, but are limited to, assisting in the formation of a solid anti-galling agent. The wax carrier can also function as a corrosion protector to inhibit or prevent corrosion formation on a part after the anti-galling agent is applied to the part. The wax carrier can also act as a corrosion resistor and/or anti-oxidant for the components in the anti-galling agent. The wax carrier can further function as a lubricant to a part during use at lower temperatures (i.e. below 700°F). The anti-seize agent has the primary function of inhibiting or preventing sticking together or galling of parts exposed to high temperatures and/or large forces. The anti-seize agent can have additional functions such as, but not limited to, lubricating properties, anti-oxidant properties, and/or anti-corrosion properties. The anti-seize agent can also function as a plasticizer to soften the wax carrier. In accordance with another aspect of the present invention, the anti-galling agent includes lower levels of high volatile compounds than those that are contained in traditional liquid anti-galling agents. The reduced high volatile content of the anti-galling agent reduces or eliminates storage and ventilation problems. The anti-galling agent can be stored in typical storage facilities without need of special ventilation and/or use of special containers for the agent. The reduced high volatile content of the anti-galling agent also enables the anti-galling agent to be used on heated equipment. Therefore, the anti-galling agent can be used during the operation of the equipment or shortly after the equipment has been shut down, thus normally eliminating the need to allow the equipment to cool prior to applying the anti-galling agent. The reduced volatile content of the anti-galling agent also reduces the incidences of flashing when the anti-galling agent is exposed to high temperature
environments. In one preferred embodiment, the anti-galling agent includes about 0-10% volatiles, and more preferably less than about 5% volatiles.
In accordance with yet another aspect of the present invention, the anti-seize agent includes high melting temperature particles having an average melting point temperature above about 500°F. Preferably, the average melting point temperature of the particles is above about 700 °F, more preferably above about 1000°F, even more preferably above about 1500°F, and still even more preferably above about 1600°F. The particles are generally powdered materials that are ground to or formed into a small particle size. Generally, the average particle size is less than about 60 mesh (0.25 mm), and preferably between about 100 and about 5000 mesh (0.148-0.0022 mm). The particles can be selected from a wide range of high melting particles. Preferably, the particles include, but are not limited to, graphite powder, fluorinated polymers powder, and metal powder. The metal powders include, but are not limited to, aluminum, chromium, cobalt, copper, lead, manganese, molybdenum, nickel, and/or steel. The metals can be in elemental or in compound form. Preferably, the high melting temperature particles include a combination of powders so as to increase the versatility of use of the anti-galling agent. However, is some applications, the high melting temperature particles are composed of a single material.
In accordance with still another aspect of the present invention, the anti-seize agent includes a dispersion system to assist in generally uniformly dispersing and suspending the high melting temperature particles in the anti-galling agent. The dispersion system can be an organic (petroleum oil, polymeric binders) or non-organic system, and can be made of one or more compounds. Preferably, the dispersion agent includes a moderately viscous oil. Such oils include, but are not limited to, petroleum oils, synthetic oils, silicon oils, an/or fluorosilicon oils. Preferably, the viscosity of the oil is about 500-6000 SUS, more preferably about 2000-4000 SUS, and even more preferably about 3000-4000 SUS to maintain the particles in suspension. In one preferred embodiment, the anti-seize agent includes about 50-95% dispersion system and about 5-50% high melting temperature particles, more preferably about 60-90% dispersion system and about 10-40% high melting temperature particles, and even more preferably about 70-85% dispersion system and about 15-30% high melting temperature particles.
In accordance with a further aspect of the present invention, the anti-galling agent can include one or more optional additives to add certain features to the anti-galling agent without changing the primary function of the anti-galling agent. The anti-galling agent can include, but is not limited to, anti-oxidants, corrosion inhibitors, thickeners, plasticizers, diluents, and/or biocides (anti-bacterial agents, fungicides). These components can be added to modify the anti-galling agent and to add certain advantages to the anti-galling agent in certain applications.
In accordance with still yet another aspect of the present invention, the wax carrier includes one or more types of waxes. Preferably, the wax carrier includes a wax such as an animal wax, an insect wax, a mineral wax, a petroleum wax, a vegetable wax, and/or a synthetic wax. These waxes include, but are not limited to, bayberry, beeswax, candelilla, carnauba, fischer-tropsch, japan, jojoba, microcrystalline, montan, ouricury, oxidized micro crystalline, ozokerite, petroleum waxes, paraffins, rice bran, Ross wax, and shellac. The wax carrier is one of the principal solidification components of the anti-galling agent. Different waxes have different melting points, different colors, and different characteristics. Particular waxes can be selected to form an anti-galling agent for a particular application. The type and amount of wax used in the wax carrier is a function of the type and amount of anti-seize agent in the anti-galling agent, and the particular application of the anti-galling agent. As can be appreciated, other components in the anti-galling agent may affect the type and amount of wax in the wax carrier. In one preferred embodiment, the wax carrier includes two or more different waxes. In one specific embodiment, the wax carrier includes a combination of candelilla wax and carnauba wax. Both of these waxes are hard waxes, but are softened by the plasticizing effect of the anti-seize agent. In another preferred embodiment, the wax carrier is selected to form an anti-galling agent having a melting temperature of above about 100°F, more preferably above about 120°F, and even more preferably above about 160°F.
In accordance with another aspect of the present invention, the anti-galling agent includes a surfactant. The surfactant is added to the anti-galling agent to assist in forming a generally homogeneous anti-galling agent. The surfactant at least partially functions as a wetting or dispersion agent to stabilize the components in the anti-galling agent. The
surfactant can have other functions such as, but not limited to, a thickener, a lubricant, an anti-oxidant, and/or a corrosion-inhibitor. In one preferred embodiment, the surfactant includes a non-ionic-surfactant and/or a sulfonate surfactant. In one specific embodiment, the surfactant includes myristic ether. In another preferred embodiment, the anti-galling agent includes about 0-40% surfactant, and more preferably about 15-25% surfactant.
In accordance with yet another embodiment of the present invention, the solid anti- galling agent is formed into a stick and dispensed from a container. The stick is preferably formed into generally cylindrical shape; however, other shapes can be selected for use of the anti-galling agent in certain applications. The dispenser preferable includes a cavity to at least partially encapsulate the stick. The dispenser also preferably includes a mechanism to controllably move the stick into and/or out of the cavity. Preferably the dispenser functions as a container for the anti-galling agent and an applicator for the anti-galling agent. Such a dispenser enhances the ease and convenience of use of the anti-galling agent and reduces the messy handling of the anti-galling agent. In one preferred embodiment, the dispenser is a repel type tube that contains a generally cylindrical stick of anti-galling agent and has a mechanism that is depressed or turned which controllably moves the stick into and out of the cavity of the tube. The repel type tube also includes a cap to cover and/or seal the anti- galling agent in the cavity of the tube, thereby, facilitating the handling and ease of use of the anti-galling agent. In accordance with still another aspect of the present invention, the anti-galling agent includes a scent to mask the natural odor of the components of the anti-galling agent. The scent can be derived from a natural source or be artificially manufactured. The particular scent used is generally derived from the oil of a tree, plant, fruit or vegetable. Scents that can be used include, but are not limited to, coconut, lemon, earth, acorn, apple, pine, cedar, and corn. The use of scents are particularly applicable for recreational uses of the anti- galling agent. In particular, the use of a scented anti-galling agent on a firearm for sport hunting will assist in masking foreign scents from the wildlife.
The principal object of the present invention is to provide an anti-galling agent that resists migration during and after application. Another object of the present invention is to provide an anti-galling agent that is
convenient and easy to handle.
Still another object of the present invention is to provide an anti-galling agent that is not highly volatile.
Still yet another object of the present invention is to provide an anti-galling agent that is easy to store.
A further object of the present invention is to provide an anti-galling agent that prevents the seizing of materials at high temperatures.
Another object of the present invention is to provide an anti-galling agent that can be used in a variety of applications. Yet another object of the present invention is to provide an anti-galling agent that is solid in at least ambient temperatures.
Still another object of the present invention is to provide an anti-galling agent that includes a wax carrier made of one or more waxes.
Still yet another object of the present invention is to provide an anti-galling agent that includes high melting temperature particles.
Yet another object of the present invention is to provide a solid anti-galling agent made of a generally homogeneous mixture of waxes and high melting temperature particles.
Another object of the present invention is to provide an anti-galling agent that provides lubrication and anti-seize functions at low, moderate and high temperatures. Still another object of the present invention is to provide an anti-galling agent that includes a surfactant to facilitate in the formation of a generally homogeneous anti-galling agent.
Yet another object of the present invention is to provide an anti-galling agent that has anti-oxidation, corrosion resistant, anti-bacterial and/or anti-fungal features. Still yet another object of the present invention is to provide an anti-galling agent which includes a masking scent.
A further object of the present invention is to provide an anti-galling agent formed in a solid stick that can be easily and conveniently dispensed from a container.
These and other objects and advantages will become apparent to those skilled in the art upon the reading and following of this description.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention has particular application to commercial and non-commercial machinery, and to firearms and related equipment and will be described with particular reference thereto; however, the invention has much broader applications and can be used in a variety of devices that include bearings, gears, hinges and/or threaded parts.
The improved anti-galling agent is a homogeneous combination of an anti-seize agent and a wax carrier that is solid at least at ambient temperature. The anti-galling agent preferably is formulated to have a melting temperature of at least about 120-160°F. The solid anti-galling agent is formed into a generally cylindrical stick; however, other shapes can be used for various applications.
The anti-seize agent includes a high melting temperature powder. The anti-seize agent also preferably includes a dispersion system. The high melting temperature powder includes powder having an average melting point of at least about 700 °F. Preferably the average melting temperature of the powder is at least about 1600°F. The average melting temperature of the powder can be adjusted by use of various types of powders. The powder is designed to act as a lubricant and/or anti-sticking agent at elevated temperatures. At high temperatures (i.e. above 700 °F), the components, other than the high melting temperature powder, melts and/or bums away. The powder is essentially the only component of the anti- galling compound left on a part to inhibit or prevent sticking and/or galling of the part. Preferably, the powder is softer than the composition of the part. The high temperature powder preferably includes graphite, fluorinated polymers, aluminum, copper, nickel, and/or molybdenum compounds (i.e. molybdenum disulfide). The average size of the particles are generally about 100-1000 mesh. The size of the particles is selected to be small enough so as to not adversely affect the torque on threaded devices or adversely affect the sliding friction on a bearing surface. However, the particles must be large enough to create a lubricating or anti-stick surface at elevated temperatures. Generally, the high temperature powder includes multiple types and sizes of particles to form an anti-galling agent that is highly versatile in a wide variety of applications. The dispersion system is preferably an oil product such as a moderate to high viscosity petroleum oil designed to suspend the powder in a generally homogeneous suspension. The anti-seize agent preferably includes about 60-
90%) dispersion system and about 10-40% high melting temperature powder. The anti-seize agent preferably constitutes about 45-65% of the anti-galling agent.
The wax carrier includes one or more waxes. The waxes can be derived from a wide variety of sources such as animal, petroleum, vegetable and/or synthetic. The wax carrier is designed to be homogeneously mixed with the anti-seize agent to form a solid product. The addition of an anti-seize agent to the wax carrier causes the wax to soften. As a result, the type and amount of wax must be selected, relative to the amount and type of anti-seize agent, to maintain the anti-galling agent in a solid form. Preferably the wax carrier includes vegetable wax. A vegetable wax is preferably used since it is a highly versatile wax, has desired melting points, and has desired physical characteristics (i.e. hardness, color, etc.) Two preferred vegetable waxes are candelilla and carnauba. These two waxes are non-toxic, have melting points above about 150°F, and are hard waxes. The combination of these waxes with an anti-seize agent forms a solid and spreadable anti-galling agent. The wax carrier preferably constitutes about 15-25% of the anti-galling agent. The anti-galling agent preferably includes a surfactant. The surfactant assists in maintaining the homogeneity of the components of the anti-galling agent. The surfactant in combination with the anti-seize agent softens and/wets the wax carrier. The surfactant is preferably a non-ionic surfactant. One preferred non-ionic surfactant which functions well with vegetable waxes is a myristic ether such as, but not limited to, propoxylated myristyl alcohol. Preferably the surfactant content of the anti-galling agent is about 15-25%.
The anti-galling agent preferably includes a masking scent when use on sporting equipment such as firearms. The scent preferably emulates plant scents or earth scents. The scent component preferably includes live plant, vegetable, and/or fruit extracts; however, artificial scents can be used. The scent for the anti-galling agent is typically selected to emulate indigenous scents to the geographic region the sporting equipment is to be used. Preferably the scents used in the anti-galling agent include, but are not limited to, citrus odors, cedar, pine, acorn, apple, and earth. The scent is preferably added to the anti-galling agent as a scented oil; however, water soluble scents can also be used.
The anti-galling agent preferably includes one or more functional additives such as thickeners, plasticizers, diluents, and/or biocides. These additives are added to the anti-
galling agent in amounts of up to about 40%, and preferably about 0-30%.
The anti-galling agent, especially when formulated for use for firearms, contains little or no abrasives which can scratch and/or damage a part of a firearm. The anti-galling agent also includes a low volatile content to prevent flashing of the anti-galling agent during use in high temperature environments.
In several applications where the anti-galling agent is to be used on threaded parts such as nuts and bolts or gun barrels, it is desirable that a specific torque-tension relationship be maintained. At sometime during the life of the threaded part, it may be desirable to remove the clamping force by disassembling the threaded part (i.e. part servicing, gun cleaning and maintenance). To tighten a threaded part, one applies torque to one of the components. In applications where the threaded parts are subjected to high temperatures, and subsequent thermal expansion, it is desirable to apply an anti-galling agent to the threads. The anti-galling agent must be one that does not significantly impede the threading-on of the parts, yet prevents sticking or galling of the threads after high temperatures and/or extreme loads have been applied. In apphcations where the temperature reaches about 1000°F or more, sticking and galling of the mating threaded part is common. The anti-galling agent is formulated to not significantly impede the assembly of threaded parts; that is, the amount of torque necessary to thread a part is reasonably low. Additionally, the torque required to disassemble the threaded parts after a high temperature and/or high load has been applied is lower than threaded parts not including the anti-galling agent. The anti-galling agent provides good lubricity in assembly and disassembly of threaded parts exposed to high temperatures and/or high loads. Additionally, the anti-galling agent does not significantly reduce the clamping force once the threaded parts have been torqued together at a desired tension. The general formulation of the anti-galling agent, in weight percent, is as follows:
Anti-seize agent 5 - 95%
Wax carrier 10 - 95%
Surfactant 0 - 40%
Scents, and other 0 - 40% modifying agents
A preferred formulation of the anti-galling agent, in weight percent, is as follows: Anti-seize agent 30 - 80%
Wax carrier 20 - 70%
Surfactant 0 - 35%
Scents, and other 0 - 30% modifying agents
A more specific preferred formulation of the anti-galling agent, in weight percent, is as follows:
Anti-seize agent 45 - 65%
Wax carrier 15 - 25%
Surfactant 15 - 25%
Scents, and other 0 - 30% modifying agents nple of anti-galling agent, in weight per
Anti-seize agent 55 - 60%
Candelilla Wax 15 - 19%
Carnauba Wax 5 - 7%
Myristol Ether 15 - 20%
The anti-seize agent in the specific example above includes about 6-20% high melting temperature powders of graphite, aluminum, copper and/or nickel. The anti-galling agent in the specific examples is a solid having a melting point above about 150°F and has a semi-soft spreadable texture. The average melting point of the high melting temperature powders is at least about 1000°F. The anti-galling agent has a dark grey color and very low odor. The anti-galling agent is designed to assist in preventing threaded (i.e. nuts and bolts, gun barrels, threaded pipes, etc) or bearing parts (i.e. sliding bearings, roller bearings, etc) from seizing when exposed to high temperatures (i.e. above about 700°F). The anti-galling agent also assists in reducing or preventing corrosion, and/or galvanic action on dissimilar metals. Consequently, the anti-galling is ideal for firearms, choke tubes, reloaders, and other machinery that needs to be disassembled on a regular basis. The anti-galling agent is formulated to be compatible with most metals; however, the anti-galling agent can be formulated to be used with a particular metal.
The anti-galling agent is formed into a stick for ease and convenience of use; however, the anti-galling agent can be formed into other shapes for use in specific applications. The anti-galling agent is applied to a part by contacting the desired part location with the anti-galling agent and moving the anti-galling agent over the desired area to be lubricated. The solid and spreadable anti-galling agent is sheared from the stick and applied to the part area. The solid anti-galling agent adheres to the part area and does not migrate to undesired locations on the part.
The anti-galling agent is preferably applied by a dispenser. The dispenser is designed to contain the anti-galling agent and to controllably dispense the anti-galling agent, thereby facilitating in the handling of the anti-galling agent. Preferably the dispenser is a repel or stick dispenser designed to dispense a solid material having substantially uniform dimensions along the length the solid (i.e. cylindrically shaped solids, etc.). The dispenser is preferably designed to dispense cylindrically shaped solids and includes a cylindrically shaped cavity to telescopically receive the cylindrically shaped solid. The dispenser also includes a mechanism to allow a user to controllably remove the solid from the cavity of the dispenser. The mechanism can also include a movable base, a threaded member, a slidable side member, etc. In one preferred arrangement, the dispenser includes a threaded member which allows a user to turn a device which in turn causes the solid anti- galling agent to be controllable displaced from the dispenser cavity. Preferably, the threaded member also allows the user to retract the solid anti-galling agent into the dispenser cavity. The threaded member can be designed to contact directly with the anti-galling agent and/or interact with a member attached to and/or embedded in the anti-galling agent. The dispenser also includes a resealable cap to enable the user to conveniently open the dispenser during use and to cover and/or reseal the dispenser after use. The dispenser allows a user to conveniently handle and apply the anti-galling agent thereby reducing handling problems and mess. The dispenser also allows for easy covering and/or sealing of the anti-galling agent. The controllable dispensing feature enables a user to apply the desired amount of anti-galling agent to a part in a controlled and precise manner.
The invention has been described with reference to a preferred embodiment and alternates thereof. It is believed that many modifications and alterations to the embodiments
disclosed will readily suggest itself to the those skilled in the art upon reading and understanding the detailed description of the invention. It is intended to include all such modifications and alterations insofar as they come within the scope of the present invention.