Showing papers on "Grease published in 2005"

Relationship among microstructure, rheology and processing of a lithium lubricating grease

Abstract: The overall objective of this work was to evaluate the evolution of the microstructure and rheology of a lubricating grease during its manufacturing process. With this aim, lithium lubricating greases were prepared by inducing the saponification reaction between 12-hydroxystearic acid and hydrated lithium hydroxide within a naphtenic lubricating oil medium, applying a controlled-temperature programme. The manufacturing process was followed through the mixing rheometry technique by measuring the evolution of torque with processing time. Samples of incipient and finished grease were taken from the stirred tank at different processing times. Rheological (linear viscoelasticity and viscous flow) and mechanical stability tests, as well as morphological studies, were carried out on each sample. The changes found in the microstructure and rheology of a lubricating grease during its processing have been related to the soap concentration in the reacting mixture, the waxy soap transition at high temperatures and the further cooling steps. From the experimental results obtained, we may conclude that a suitable lithium lubricating grease is a highly structured system, based on the development of a three-dimensional network due to the presence of metallic soap crystallites.

Silicone grease composition

Abstract: A silicone grease composition composed of an organopolysiloxane fluid and a thickneing agent is admixed with from 0.5 to 20% by weight of a copper dialkyl dithiocarbamate or, in particular copper diethyl dithiocarbamate as a lubrication improving agent so that the grease composition is imparted with greatly improved boundary lubrication under extreme-pressure conditions between steel and steel as well as improved thermal stability.

Soybean oil based greases: influence of composition on thermo-oxidative and tribochemical behavior.

Abstract: The biodegradable properties and lubricating ability of greases depend on both the base oil and the thickener. Mineral oils are the most widely used lubricant base fluids due to their inherent lubricity and low cost, but recent environmental awareness has forced consideration of the use of biodegradable fluids such as vegetable oils and certain synthetic fluids in grease formulations. This study presents data on the thermo-oxidation behavior and tribology of biodegradable greases formulated with soybean oil and different compositions of metal soap thickener. The composition of thickener has been varied by using fatty acids with different degrees of unsaturation and fatty acids of different chain lengths. The improvement of thermo-oxidation and tribological properties as a result of changing thickener/base oil ratio and the antioxidative effect of some suitable additives have also been evaluated. Keywords: Grease; soybean oil; vegetable oils; oxidative stability; friction

Grease, rolling bearing, constant velocity joint and rolling parts

Abstract: The present invention provides grease which prevents frictional wear on a lubricating surface and excellent in performance of preventing occurrence of flaking, heat-resistant performance, and long-term durability, a grease-enclosed rolling bearing, a constant velocity joint, and rolling parts Grease is composed of base grease, essentially containing a thickener, to which at least 001 to 15 wt % of one substance selected from among bismuth and inorganic bismuth compounds is added The inorganic bismuth compounds are at least one inorganic bismuth selected from among bismuth sulfate, bismuth trioxide, bismuth carbonate, and sodium bismuthate The above-described grease is used for the rolling bearing and the constant velocity joint A coating film of at least one substance selected from among the bismuth and the inorganic bismuth is formed on surfaces of the rolling parts

Lubricating grease composition

Abstract: Disclosed is a lubricating grease composition composed of a base oil to which a thickening agent is preferably added. The base oil is obtained by mixing 100 parts by weight of at least one of a perfluoropolyether oil (A) expressed as RfO[CF(CF3)CF2O]p(CF2CF2O)qRf (wherein Rf represents a perfluoroalkyl group having 1-5 carbon atoms, p + q = 2-200, q/p = 0-2, and q may be 0) and a perfluoropolyether oil (B) expressed as F(CF2CF2CF2O)sC2F5 (wherein s = 2-100) with 0-100 parts by weight of at least one of a perfluoropolyether oil (C) expressed as RfO(CF2CF2O)m(CF2O)nRf (wherein m + n = 3-200, m:n = 10-90:90-10) and a perfluoropolyether oil (D) expressed as RfO[CF(CF3)CF2O]a(CF2CF2O)b(CF2O)cRf (wherein a + b + c = 3-200, b is 0 or an integer of not less than 1, and c is an integer of not less than 1). This lubricating grease composition suppresses corrosion of a metal member by a corrosive gas, while having heat resistance.

Waterproof grease composition and roller bearing for wheel support

Abstract: A waterproof grease composition comprising a base oil of 10 to 400 mm2/s kinematic viscosity at 40°C composed of at least one of a mineral oil and a synthetic oil, a thickening agent, a surfactant, a metal soap, a fluorinated water repellent agent, a silicone water repellent agent, a pH adjusting agent and a water resistance imparting agent selected from among waxes, polymers and graphite. This waterproof grease composition even when water is mixed therein can avoid exfoliation, such as white tissue exfoliation. Further, there is provided a roller bearing for wheel support, comprising an inner member with a track surface on its outer circumferential surface; an outer member having on its inner circumferential surface a track surface opposed to the track surface of the inner member, the outer member disposed outside the inner member; and multiple rolling elements disposed rotatably between the two track surfaces, wherein the above waterproof grease composition is enclosed. This roller bearing excels in water resistance.

Polyurea grease composite

Abstract: Two lubricating polyurea-ester compositions with high stability and extreme-pressure antiwear performance contain proportionally basic oil, urea-based thickening agent, Ca-based thickening agent and extreme-pressure agent for composition A, or the composition A plus inorganic Ca salt for composition B

Liquid detergent composition for improved low temperature grease cleaning

Abstract: A liquid detergent composition having mid-branched amine oxides and C10-C14 alkyl or hydroxyalkyl sulphate or sulphonate surfactants to provide improved low temperature grease cleaning. A method of washing dishes with the liquid detergent composition.

Grease protecting apparatus for heat sink

Abstract: A grease protecting apparatus (10) includes a heat sink (12) defining a plurality of receiving cavities (124) therein, a layer of grease (16) spread on a surface (122) of the heat sink, and a grease cover (14) attached to the surface of the heat sink for protecting the grease from contamination. The cover includes a main body (142) defining a protecting space (143) therein for covering the grease, two wings (144) extending from two opposite sides of the main body, and a plurality of projections (148) extending from the wings for being snapped in the receiving cavities of the heat sink. The projection has a trapezium-shaped cross section.

Heat reversible gel-like lubricating composition, process for producing the same, and bearing lubricant and bearing system using said composition

Abstract: This invention provides a heat reversible gel-like lubricating composition having such properties that, in a service bulk temperature region, the composition is in a semi-solid gel form as with grease, but on the other hand, in a local high-temperature region such as a sliding contact site, the composition is homogeneously melted, is free from a drawback of grease, i.e., the precipitation of foreign materials, exhibit excellent low frictional characteristics unrealizable by grease, and exhibits significant energy saving properties. The heat reversible gel-like lubricating composition comprises a mineral oil and/or synthetic liquid lubricating base oil and a bisamide and/or a monoamide and has heat reversible gel properties. Preferably, the heat reversible gel-like lubricating composition contains a triamide and further contains, based on 100 parts by weight of the liquid lubricating base oil, 0.01 to 500 parts by weight in total of a bisamide and a monoamide and 0.05 to 10 parts by weight of a friction regulator.

Process for preparing bio-diesel-oil by using microalgae fat

Abstract: The invention discloses a process for preparing bio-diesel-oil by using microalgae fat, which comprises charging a predetermined amount of methyl alcohol into micro-algae grease, heating to a predetermined temperature, at the presence of acid catalyst, producing biological diesel oil through reaction, which has a density of 0.864kg/l, a viscosity of 5.2X10-4 (40 deg. C), and a caloric value of 41MJ/kg.

Sunflower Based Grease for Heavy Duty Applications

Abstract: There is a great consumption of grease in an excavator (∼200 Kg/year). This big amount of lubricant is poured directly to the environment. A grease based in sunflower oil and polymer thickener has been developed. An extensive tribological characterization has been carried out in order to ensure a good compromise between EP and AW properties so that the grease could be used in two different applications: in the reduction gear (crown) and in the articulations (bushing/pin). The performance of the biogrease has been compared with two reference mineral lubricants.Copyright © 2005 by ASME

Energy-saving environment protective lubricating oil

Abstract: The invention discloses an energy-saving environment protective lubricating oil, wherein the base oil is mixed oil of synthesized grease with II category, III category and IV category selected from the API classification, the additives include detersive, ashless dispersant, antioxidant antirusting agent, auxiliary anti-oxidant, viscosity index improver, pourpoint depressant, defoaming agent, friction improver.

Grease resistance and water resistance compositions and methods

Abstract: A method of improving grease and/or water resistance of a material is disclosed that comprises treating the material with wax and poly(vinyl alcohol) and optionally with a polyamine. Compositions for practicing the method and materials that have been treated by the method are also disclosed.

Process for producing lubricating grease

Abstract: The present invention relates to a process for producing lubricating grease by adding a polymeric structure improver in a composition liquid at 25° C. to the dispersion to a dispersion which has grease structure and comprises at least one thickener and at least one lubricating oil.

Separation system for the removal of fat, oil or grease from wastewater

Abstract: A wastewater separation system for separating an aqueous phase from an organic phase comprising oil, fat and/or grease in wastewater is disclosed. The wastewater may be collected from restaurant grease traps, as well as other food preparation facilities, schools, hospitals, processing plants and the like. A separator, such as a centrifugal separation device, comprises a wastewater inlet, an organic phase outlet for discharging low density liquid and solids and an aqueous phase outlet for discharging water and possibly other high density liquids and solids. The system can be portable and can be mounted on a vehicle for collection and treatment at various sites. Heat can be introduced to the system to accelerate the separation of the aqueous phase from the organic phase of the wastewater.

A Study of Spur Gears Lubricated With Grease-Observations From Seven Experiments

Abstract: To improve understanding of gears operating with a perfluoro type space-qualified grease, seven spur gear experiments were performed. Test conditions were selected to study the influences of torque, lubricant type, and atmosphere. Two testing torques provided nominal pitch-line Hertz stresses greater and lesser than the contact stress limit as recommended by the grease manufacturer. As was expected, all tests resulted in some gear tooth wear. Discoloration of the perfluoro type grease occurred for all tests. Tests in dry nitrogen produced some dark-grey colored perfluoro type grease. Testing in either ambient or dry air produced red debris after short test duration, and for tests of longer duration large amounts of red debris, red grease, and wear were evident. Tests using higher torques produced more debris. The first indications of discoloration occurred more quickly with higher test torques. Total amounts of wear were quite significant, up to four times the profile tolerance for AGMA Class 10 gears.

Liquid detergent composition for improved low temperature grease cleaning and starch soil cleaning

Abstract: A liquid detergent composition having dialkyl sulfosuccinates and amine oxides to provide improved low temperature grease cleaning and/or improved starch soil cleaning.

Method for making a carbon nanotube-based field emission cathode device

Abstract: A preferred method for making a carbon nanotube-based field emission cathode device in accordance with the invention includes the following steps: preparing a solution having a solvent and a predetermined quantity of carbon nanotubes dispersed therein; providing a base with an electrode ( 101 ) formed thereon; forming a layer of conductive grease ( 102 ) on the base; distributing the solution on the layer of conductive grease to form a carbon nanotube layer ( 103 ) on the conductive grease; and scoring the layer of conductive grease, for separating first ends of at least some of the carbon nanotubes from the conductive grease for attaining effective carbon nanotube field emission cathode.

Grease cover for heat dissipating apparatus

Abstract: A grease cover ( 50 ) for protecting grease spread on a bottom surface of a heat sink ( 20 ) includes a base wall ( 51 ), a plurality of sidewalls ( 52 a , 52 b , 52 c , 52 d ), a protecting space ( 53 ) between the base wall and the sidewalls, a holding space in an upper portion of the protecting space, and two projections ( 54 ). The protecting space is for accommodating the grease. The holding space is for receiving the heat sink therein. The projections extend from two opposite sidewalls of the grease cover. A top surface of each of the projections spaces a distance from the base wall, for supporting the bottom surface of the heat sink to enable the grease away from the base wall, when the heat sink is received in the holding space.

High detergency abrasive detergent

Abstract: PROBLEM TO BE SOLVED: To provide an abrasive detergent capable of safely and easily cleaning objects and human bodies required for the effect of removing a tough dirt such as of a cutting oil or a grease having a high viscosity. SOLUTION: The abrasive detergent comprises a porous abrasive having irregular shapes formed of flocculated or connected approximate spheres. The abrasive preferably has a bulk density of 0.01 or more and 0.35 g/cm 3 or less. The materials for the abrasive include, for example, organic materials such as polyethylene and polyvinyl alcohol, inorganic materials such as silicic anhydride, aluminum silicate and aluminum oxide, polymers such as crystalline cellulose and chitosan, biodegradable abrasives such as polylactic acid and polybutylene succinate, fibers such as cotton and rayon, natural materials such as walnut shell and seashell and food seasonings such as salt and sugar. COPYRIGHT: (C)2007,JPO&INPIT

Grease base oil for bearing

Abstract: [PROBLEMS] In addition to excellent lubricity at low temperature, it can maintain excellent lubricity even when used for a long time at high temperature, and has excellent lubricity over a wide range of operating temperature over a long period of time. To provide a grease base oil for bearings. The carboxylic acid comprises (A) n-heptanoic acid and (B) 2-ethylhexanoic acid, which is obtained by esterification of pentaerythritol and carboxylic acid. A grease base oil for bearings in which the molar ratio of heptanoic acid / (B) 2-ethylhexanoic acid is 20/80 to 42.2 / 48.9. [Selection figure] None

Vacuum processing apparatus

Abstract: A grease supply mechanism is provided inside a vacuum transfer chamber. The grease supply mechanism includes: a grease storage part in a bottomed cylindrical shape storing grease therein; and a movable cover covering an opening of the grease storage part and sliding while being in contact with an inner wall of the grease storage part. When the cover is pressed and moved, the grease is supplied into a grease inlet via a grease supply port.

Rotation transmission apparatus with built-in one-way clutch

Abstract: In order to provide a one-way clutch-containing rotation transmission apparatus of a high performance and an excellent durability, which shows a satisfactory lubricating property in a one-way clutch and a rolling bearing over a wide temperature range from a low temperature to a high temperature, in which an antirust agent for preventing a corrosion by rainwater or the like has little environmental burden and which does not cause an exfoliation of metal materials under a vibrating condition, a grease composition, employing a synthetic oil as a base oil, also employing at least either of an urea compound and a metal soap as a thickener and containing a non-barium type antirust agent in an amount of from 1.0 to 10 mass % with respect to the entire amount of the grease, is sealed in the rolling bearing and the one-way clutch.

extracting hood with grease filter

Abstract: The fume extractor hood, over a cooking area, has a grease filter (6) with two filter plates (8) at an angle to each other and an air guide (2,3) to direct the air flow to them. The air flow deflection turns it against the striking direction to increase the separation of grease and water droplets. A thicker filter body (9) is behind the filter plates.

Paraffin emulsifier and its making method

Abstract: The invention provides a paraffin emulsifier and its making method, wherein the emulsifier comprises lauryl alcohol, ethylene oxide, monoester, stearinic acid and ethanol, and solid or grease form ceresin wax emulsifying agent can be obtained through reaction in common autoclaves.