Showing papers on "Grease published in 1974"

Modified lithium soap grease

Abstract: A grease composition that combines good water resistance, good mechanical stability and high oil retention with excellent oxidation stability and high dropping point is prepared by the use of a novel thickener system whose essential components include a combination of dilithium salt of a C4-C12 dicarboxylic acid, e.g. dilithium azelate; a lithium soap of a 9-, 10-, or 12hydroxy C12 to C24 fatty acid, e.g. lithium 12-hydroxy-stearate; and a lithium salt formed in situ in the grease from a second hydroxy carboxylic acid wherein the OH group is attached to a carbon atom not more than 6 carbon atoms removed from the carboxyl group, and wherein either of those groups may be attached to either aliphatic or aromatic portions of a molecule. If desired, sufficient lithium hydroxide can be added to form the dilithium salt of the latter acid through reaction of its hydroxyl group.

Recovery of paper fiber from waste material contaminated with grease, wax and/or similar material

Abstract: In a method of recovering reusable papermaking fibers from waste material containing substantial quantities of grease, wax and/or similar materials, such particularly as municipal waste including garbage, a slurry of cellulose fibers contaminated by grease and/or wax is heated to an elevated temperature, e.g. 180 DEG F, and subjected to a centrifugal flotation treatment in a cylindrical-conical or conical vessel having a tangential inlet port and outlet ports at its apex and base, the supply flow and pressure to the vessel being maintained sufficiently high and the discharge flows through the outlet ports being controlled to effect discharge of substantial volumetric flows through both outlet ports under centrifugal force conditions comparable to those used in conventional centrifugal cleaning operations in a vortex separator of comparable size. The discharge flow through the apex port contains a large majority of the fibers of good paper making quality, while the discharge flow through the base (top) outlet contains the majority of the reject material, a significant proportion of which is solvent-soluble grease, wax and/or similar material. This process of hot centrifugal flotation is also applicable to other secondary fiber stocks, e.g. de-inked stocks, containing appreciable quantities of grease, wax and/or similar material such particularly as plastic fibers and fragments similar in specific gravity to paper fibers.

Low-wear grease for journal bearings

Abstract: A low-wear grease for journal bearings characterized by a high temperature, multi-purpose heavy duty hydrocarbonaceous lubricant that is thickened by calcium acetate complex to form a lubricating grease having an ASTM worked penetration no less than 265; and molybdenum disulfide and a selected class of metallic oxide in effective and synergistic amounts. Surprisingly, better lubrication is provided when the molybdenum disulfide particles are non-uniform in size so they have a range of sizes, including some fine and some relatively coarse but are small enough to pass 100 percent through a 100 mesh screen, and 85 percent through a 325 mesh screen. The metallic oxide is either antimony trioxide or a mixture of substantially equal parts of antimony trioxide, zinc oxide, lead oxide, nickel oxide, tungsten trioxide, vanadium pentoxide and copper oxide. The particles of the metallic oxide are small enough to pass 90 percent through a 325 mesh screen. All particles are uniformly dispersed in the thickened, heavy duty lubricating grease.

Device for regreasing bearings

Abstract: A device and method for regreasing a rotary bearing are disclosed in which the bearing is mounted in a bearing housing having a grease injection opening formed adjacent one side of the bearing and at least one discharge opening formed therein adjacent the other side of the bearing. A grease slinger plate is mounted on the rotary shaft supported by the bearing and is located adjacent said other side of the bearing for rotary movement with the shaft. The plate has at least one canted vane formed thereon at its periphery for urging grease from the bearing to and through the discharge opening. When regreasing the bearing, all openings in the housing are opened and grease is injected through the injection opening while the shaft is rotating so that new grease is urged by the vane through the bearing, while it simultaneously urges old grease out of the discharge opening.

Lubricant with synergistic extreme pressure additives

Abstract: A grease may be made having synergistic extreme pressure properties using a major amount of a base oil and a thickener and a minor amount of low density polyethylene and known extreme pressure enhancing additives.

Combination grease centrifugal separator and flame trap

Abstract: A combination grease centrifugal separator and flame trap removably mounted in the exhaust hood of a cooking range which extracts grease and other foreign particles from the cooking fumes as they pass through the filter and prevents further propogation of any attendant flame at the filter.

Frying grease reclaimer

Abstract: An automatic fluid filtering system especially designed for reclaiming, deodorizing, decolorizing, and filtering hot frying greases or oil used in restaurants, hamburger stands, fried food industries, homes, and other places and having a means of utilizing wood charcoals, Norite, Salite and various filtering materials such as filter paper, toilet tissues, porous ceramics, etc., to remove food debris, odorous materials and also being very simple in operation and capable of rapidly carrying out the filtration task automatically right in the kitchen working area at any time when fresh clean grease is needed.

Machine for testing bearing grease

Abstract: A machine for testing bearing grease in which a shaft is supported in two bearings the outer race of each of which is set in a housing for the grease to be tested and breaking means for the shaft which will cause the bearings to heat.

Grease composition and method of preparing the same

Abstract: A novel grease composition is prepared by admixing a lubricating oil with 0.5 to 10 weight percent of a mono- or polyurea compound or mixture of mono- and/or polyurea compounds having from 1 to 8 ureido groups and having a molecular weight between about 375 to 2,500 and from 3 to 30 weight percent of an alkaline earth metal carbonate.

29—polarity fractionation of solvent-extracted wool grease

Abstract: An account is given of an investigation of methods for the fractionation of solvent-extracted wool grease into distinct non-polar, semi-polar, and highly polar groups. The non-polar fraction is conventionally referred to as unoxidized grease and the semi-polar fractions are referred to as oxidized grease. The highly polar fraction possesses strong surface-active properties and is not identified forthwith as being strictly a part of the grease constituent of raw wool. The methods were applied to determine quantitatively the extent of oxidation of a wool grease and the amount of amphiphilic or surface-active matter, including synthetic detergents, extracted by the solvent from a wool sample or an aliquot of an aqueous emulsion. In addition, it is demonstrated that the amount of methanol-insoluble matter in solvent-extracted wool grease is closely related to, and could be used to predict, the maximum efficiency of recovery of grease in a centrifuge.

Oil and grease separation from water - by addition of finely granular synthetic carbon

Abstract: Water contaminated by oil and/or grease is purified by separating these impurities by the addition of finely granular adsorbents containing carbon. The additive can be graphite, coal, coke or synthetic carbon (graphite mixed with soot or pitch, pressed sintered and impregnated with copper, lead or antimony). No expensive chemicals needed; cheap process; waste dust from synthetic carbon production can be utilized. The specific gravity of the synthetic carbon is held between 1 and 1.7 g/cm3 (1.4-1.7 g/cm3); the mean particle size of the adsorbent lies between 5 mu and 0.5 mm (5 mu -0.1 mm). The adsorbent is added at a rate of 2:1 to 1:4 (1:1) referred to the oil content of the emulsion.

Grease fitting assembly including safety stop

Abstract: A grease fitting assembly is provided for introducing grease into the cylinder of a hydraulic track tension adjustor. The assembly includes a grease fitting which is threadably received in a bore section of a passage leading to the adjustor cylinder. A relief port intersects the passage and the fitting cooperates with the bore so as to prevent the flow of grease through the relief port when the fitting is in a normally fully installed position. The fitting is movable to a first partially unscrewed position for permitting the flow of grease through the relief port and is movable to a further partially unscrewed position for permitting grease to flow through axial grooves formed in the outer surface of the fitting to the outer end of the bore section so as to provide an alternate passage for relieving grease in the event that the relief port becomes plugged. In order to insure that the fitting is not inadvertently unscrewed past the second partially unscrewed position to the extent that the pressurized grease will cause the fitting to be pressure disengaged from the bore, a safety stop member is provided to engage the fitting when it has been unscrewed a predetermined distance.

Ventilation apparatus and method

Abstract: A workspace, within a building where a process is practiced by which airborne liquid particulate grease is generated, is ventilated by an apparatus and in accordance with a method by which air is induced to flow at conveying velocity from the workspace into an unrestricted hood and through an unrestricted duct to a location remote from the workspace, entraining airborne liquid particulate grease with the air and thereby unrestrictedly conveying entrained grease from the workspace to the remote location. At the remote location, the flowing air and conveyed grease is directed into a collection chamber and there guided along an at least partially circular, sharply turning flow path while first accelerating and then decelerating the velocity of flow thereby separating the conveyed grease from the flowing air. The separated grease is retained in the collection chamber while the flowing air which conveyed the grease to the chamber is passed to the ambient atmosphere.

Methods of recovering wool grease from spent wool scouring liquor

Abstract: Method of treating wool scouring liquor effluent to render it suitable for recycling or discharge and to concurrently recover wool grease as a by-product. The method comprises mixing scouring liquor effluent with sufficient alcohol to produce a concentration in excess of saturation to leave a discrete alcohol phase, adding a selected flocculant to effect a liquid/liquid separation of grease from the liquor and stripping the separated grease from the alcohol phase.

The Frictional Traction Characteristics of Greases in Heavily Loaded Contacts

Abstract: Experimental results using a disc machine are given which clearly demonstrate the increase in frictional traction with time until a steady-state value less than that of the carrier oil is achieved. This increasing traction is associated with the mechanical degradation of the grease structure, which also results in a reduced film thickness. It is also shown that greases can lead to starvation, and hence failure, at higher slip speeds, and this effect is probably associated with the viscoelastic properties of the grease. Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference held in Atlanta, Georgia, October 16–18, 1973

Wool-scouring Effluent. Part I: The Determination of Grease Content by Solvent-extraction and its Relationship to Centrifugal Recovery

Abstract: (1974). Wool-scouring Effluent. Part I: The Determination of Grease Content by Solvent-extraction and its Relationship to Centrifugal Recovery. The Journal of The Textile Institute: Vol. 65, No. 7, pp. 384-386.

Lubricated gas seal for reactor wall - has grease reservoir providing continuous make-up to grease chamber

Abstract: A gastight shaft sealing system for passing a shaft through a wall, esp. for transmitting power into a radioactive room from outside comprises a number of annular seals with a grease chamber around the shaft between them. This is connected to a grease reservoir outside the seal unit, which is a diaphragm pressure reservoir acting as a make-up chamber for supplying the grease chamber. The pressure in this is pref. monitored by a manometer. The seals are pref. soft seals, supported by discs esp. of plastics (PTFE). A continuous reservoir of lubricant is available. No auxiliary equipment, such as a compressed air supply is required since the reservoir is a closed vessel, divided by a diaphragm with lubricant on one side, pressurised gas on the other.

Structurizing effect of polyethylene and polyisobutylene in oils and greases

Abstract: 1. It has been established that polyethylene, upon swelling in oils, forms plastic structurized systems, while polyisobutylene forms viscous liquids; the thickening effect of polyethylene due to its crystalline structure is substantially greater than that of polyisobutylene. 2. It has been shown that polyisobutylene favors the structurization of lithium, silica gel, and hydrocarbon greases, regardless of the composition of the dispersion medium. The concentration of polymer in silica gel grease prepared with PN-6 oil must be at least 2%, and in the hydrocarbon grease prepared with S-220 oil at least 3%. 3. It has been established that polyisobutylene promotes structurization of lithium and hydrocarbon greases prepared with PN-6 oil, but brings about a softening of the silica gel greases. In the greases prepared with S-220 oil, the addition of polymer (within the concentration range investigated) leads to softening of the greases.

Silica-gel greases with polymeric additives

Abstract: From a study of the influence of polyethylene and polyisobutylene on the properties of silica-gel greases, the following have been established: 1. The addition of polyethylene to silica-gel greases improves not only the rheological property indices (yield value, viscosity, oil bleeding, and mechanical stability), but also the service characteristics (antiwear and antiscoring properties, water resistance, adhesivity, and heat-hardening behavior). 2. The addition of high-molecular-weight P-200 polyisobutylene in amounts less than 1% is effective only for the silica-gel greases prepared from the nonpolar naphthenic-paraffinic cable oil S-220. In the silica-gel greases prepared from the aromatic oil PN-6, it is not desirable to use this polyisobutylene, as it produces a substantial deterioration in the strength properties of the grease.

Grease filled cables - having irradiated polyethylene covered conductors

Abstract: In a cable of the type having a wrapped grease filled core contg. insulated conductors, an intermediate metal screen layer, and an outer plastics layer, the core conductors are covered with an irradiated cross-linked polyethylene. This enables cables with polyethylene insulation to be used at higher temps (>86 degrees C) without cracking thus avoiding the use of the more expensive polypropylene. Irradiation is effected at 6 - 15 megarads. Pref. the grease is petroleum based and may be a mixture of this with a low mol. wt. polyethyl.

Rust-Inhibited Nonreactive Perfluorinated Polymer Greases

Abstract: : Perfluoroalkylpolyether fluids thickened with polytetrafluoroethylene were studied in connection with the development of rust-inhibited chemically inert greases for liquid-fueled rocket engines. It was found that 1.0 to 3.0 wt. percent of a physically and chemically modified organophilic dimethyloctadecylbenzyl ammonium bentonite + sodium nitrate imparts very effective rust-preventive properties to perfluoro polymer grease mixtures. Data are given which show that the rust-inhibited greases are nonreactive on contact with conventional fuels and oxidizers, exhibit lubricating properties comparable to soap-thickened greases with a significant improvement in extreme pressure properties, and are nonreactive at high impact energies in the presence of LOX. The results of this work are applicable to all liquid-fueled rocket engines for missiles and space vehicles.

Complex soap lubricating grease

Abstract: A calcium complex soap lubricating grease comprising lubricating oil and calcium soaps, the calcium soap being prepared from fatty acid, calcium hydroxide, sodium phosphates, and sodium borates.

Grease extn. ventilator for cooking areas - with easily cleaned interior, reducing fire risk

Abstract: The ventilator comprises a series of generally concentric curved baffles, which direct air flow over the surface of a water bath contained in the lower part of the ventilator. Air flow causes the water level to rise up a curved plate at the rear of the water bath, so that grease, etc., is passed over the top surface to outlet. The unit is cleaned by adding detergent to the water bath and spraying internally with hot and cold water in an automatic sequence. Since the interior of the ventilator is easily cleaned, the risk of fire due to accumulated grease is greatly reduced.