Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M123/00—Lubricating compositions characterised by the thickener being a mixture of two or more compounds covered by more than one of the main groups C10M113/00 - C10M121/00, each of these compounds being essential
  • C10M123/04—Lubricating compositions characterised by the thickener being a mixture of two or more compounds covered by more than one of the main groups C10M113/00 - C10M121/00, each of these compounds being essential at least one of them being a macromolecular compound
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/0213—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as thickening agents
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/024—Propene
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/10—Carboxylix acids; Neutral salts thereof
  • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
  • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
  • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
  • C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/10—Carboxylix acids; Neutral salts thereof
  • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
  • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
  • C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
  • C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/02—Groups 1 or 11
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/04—Groups 2 or 12
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/06—Groups 3 or 13
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/10—Groups 5 or 15
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/04—Molecular weight; Molecular weight distribution
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/76—Reduction of noise, shudder, or vibrations
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/02—Bearings
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
  • C10N2050/10—Semi-solids; greasy
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2070/00—Specific manufacturing methods for lubricant compositions

Definitions

• the present invention relates to a method for producing a grease composition, the grease composition obtainable by said method, and the use of the grease composition for lubricating a bearing, a gearing system or a coupling.
• Greases are widely used for lubricating bearings and other structural components.
• a grease is an essential product to reduce, for example, wear, friction, running temperatures and energy losses.
• Lubricating greases comprise a lubricating base oil and a thickener.
• the oil bleeds out of the oil/thickener-structure onto the surface of the bearing, thereby establishing a steady-state oil film on the surface of the bearing which provides the lubricating action.
• the oil bleeding characteristics at the service temperature of the lubricant grease composition i.e. the running temperature of the bearing, as well as the "start up" temperature) are therefore critical for obtaining the lubricating action of the composition.
• An object of the invention is to provide a method for producing grease compositions that provide improved and multifunctional steady-state oil films on the surfaces of bearings, gearing systems or couplings.
• the present invention relates to a method for producing a grease composition comprising a base oil and a multiple thickener system which comprises a non-polar thickener component and a polar thickener component, which method involves the steps of: preparing a first mixture which comprises a polar thickener and a base oil; preparing a second mixture which comprises a non-polar thickener and a base oil; preparing a third mixture which comprises the first mixture or the polar thickener which has been separated from the first mixture and the second mixture; - cooling at least the second mixture to room temperature by means of a rapid cooling process; and subjecting the third mixture to a mechanical shearing treatment.
• the present method comprises the steps of: mixing a polar thickener into a base oil at a temperature above the melting point of the polar thickener to prepare the first mixture; - mixing a non-polar thickener into a base oil at a temperature above the melting point of the non-polar thickener to prepare the second mixture; mixing the first mixture into the second mixture to prepare the third mixture; cooling the third mixture to room temperature by means of a rapid cooling process, and subjecting the third mixture to a mechanical shearing treatment.
• the present method comprises the steps of: mixing a polar thickener into a base oil at a temperature above the melting point of the polar thickener to prepare the first mixture; cooling the first mixture to room temperature by means of a rapid cooling process, mixing a non-polar thickener into a base oil at a temperature above the melting point of the non-polar thickener to prepare the second mixture; cooling the second mixture to room temperature by means of a rapid cooling process; mixing the cooled first mixture into the cooled second mixture to prepare the third mixture; and subjecting the third mixture to a mechanical shearing treatment.
• the present method comprises the steps of: preparing at an elevated temperature the first mixture which comprises a polar thickener and a base oil; cooling the first mixture to room temperature, preferably by means of a rapid cooling process, separating the polar thickener from the first mixture; mixing a non-polar thickener into a base oil at a temperature above the melting point of the non-polar thickener to prepare the second mixture; mixing the polar thickener into the second mixture at an elevated temperature to prepare the third mixture; cooling the third mixture to room temperature by means of a rapid cooling process; and subjecting the third mixture to a mechanical shearing treatment.
• the present method comprises the steps of: preparing at an elevated temperature the first mixture comprising a polar thickener and a base oil; cooling the first mixture to room temperature, preferably by means of a rapid cooling process, separating the polar thickener from the first mixture; mixing a non-polar thickener into a base oil at a temperature above the melting point of the non-polar thickener to prepare the second mixture; cooling the second mixture to room temperature by means of a rapid cooling process; mixing the polar thickener into the cooled second mixture to prepare the third mixture; and subjecting the third mixture to a mechanical shearing treatment.
• the non-polar thickener can suitably be mixed into the base oil at a temperature in the range of from 90-250°C, preferably in the range of from 140-230 0 C, and more preferably in the range of from 160-210°C, to prepare the second mixture.
• the rapid cooling process is performed in less than 30 seconds.
• the rapid cooling process is performed at a cooling rate of between 5 and 20°C per second. More preferably, the rapid cooling process is performed at a cooling rate of between 6 and 15°C per second.
• the elevated temperature at which the first mixture can be prepared is suitably in the range of from 90-250°C, preferably in the range of from 140-230 °C, more preferably in the range of from 160-210 °C.
• the elevated temperature to be used depends on the type of polar thickener to be used, as will be understood by the skilled person.
• the polar thickener is suitably formed during the preparation of the first mixture.
• the polar thickener can, for example, be formed by heating a metal hydroxide and a stearic acid in a base oil at a temperature of 120°C. After formation the polar thickener obtained can, for instance, be separated from the base oil by way of washing.
• the elevated temperature at which the polar thickener is mixed into the second mixture to form the third mixture is preferably in the range of from 90-250°C, more preferably in the range of from 140-210 0 C.
• the elevated temperature to be used depends on the type of polar thickener to be used, as will be understood by the skilled person.
• the polar thickener to be used in accordance with the present invention is suitably a metal based soap or a metal based complex soap.
• the polar thickener is a metal salt of a fatty acid or a hydroxy- fatty acid.
• the fatty acid to be used in accordance with the present invention is preferably stearic acid or hydroxyl-stearic acid.
• the base oil to be used in accordance with the present invention can suitably comprise one or more of mineral oils, polyalphaolefins, ester oils, and/or vegetable oils.
• the non-polar thickener to be used in accordance with the present invention can suitably comprise one or more polymers, polymer-like rubbers, synthetic rubbers and/or natural rubbers.
• polymers include polypropylenes.
• the non-polar thickener substantially consists of a mixture of (1) a (co- or homo-) polymer of propylene with an average molecular weight equal to or larger than 200,000 and (2) a (co- or homo-) polymer of propylene with an average molecular weight equal to or smaller than 100,000.
• the non-polar thickener to be used in accordance with the present invention comprises a high molecular weight component comprising a (co- or homo-) polymer of propylene with a weight average molecular weight equal to or larger than 200,000, preferably in the range of from 200,000-500,000 and a low molecular weight component comprising a (co- or homo-) polymer of propylene with a weight average molecular weight equal to or smaller than 100,000, preferably in the range of from 10,000-100,000.
• the weight ratio between the high molecular weight component and the low molecular weight component in the non-polar thickener is preferably 1 :40-1 :5, more preferably 1 :25- 1 :15, more preferably about 1 : 19.
• the low molecular weight component is preferably a polypropylene homopolymer, more preferably a polypropylene homopolymer with a melt flow rate of 500-2000 dg/min., especially 750-1250 dg/min. as determined by test ASTM D 1238 L.
• the high molecular weight component preferably has a melt flow rate (ASTM D-1238) of 1.5-15, more preferably 1.5-7, especially about 3.5.
• the metal in the metal based soap or the metal based complex soap is preferably selected from the group consisting of lithium, potassium, sodium, calcium, magnesium, bismuth, aluminium, antimony, barium, lead and zinc. More preferably, metal is selected from the group consisting of bismuth, zinc, calcium and lithium. Most preferably, the metal is bismuth.
• the preparation of the grease composition should preferably be carried out under a protective atmosphere, such as a nitrogen gasflow, for avoiding oxidation of the oils during heating.
• quenching The rapid cooling process, which forms an important aspect of the invention, will be indicated herein below as "quenching".
• the quenching of the lubricant grease composition can be carried out, for instance, by pouring the grease composition on a metal plate, although any other suitable rapid cooling method may also be used, such as spraying.
• the cooling process takes place in the absence of any additional water because of the condensation that will take place in and on the base oil and, if applicable, the metal plate.
• the quenching process according to the invention has a major influence on the grease structure, giving significant improvement of the properties of the final grease compositions compared to both conventional lubricating greases, as well as lubricating greases according to the invention which are cooled slowly, e.g. in approximately 1 degree per minute by the use of conventional cooling methods, such as simply keeping the grease in the reaction vessel with external/internal cooling.
• conventional cooling methods such as simply keeping the grease in the reaction vessel with external/internal cooling.
• the smoother and more uniform thickener structure obtained by quenching has a beneficial influence on the final properties of the grease composition, such as the mechanical properties, the oil bleeding characteristics, the noise characteristics, as well as the transport of the oil within the grease structure, so that the properties of the polymer-thickened grease compositions obtained by the use of the polymeric thickener according to the invention are improved even further.
• the third mixture in accordance with the present invention is subjected to a mechanical shearing treatment.
• a mechanical shearing treatment For this purpose a three-roll mil, a grease worker or any conventional mechanical shearing equipment can be used. During the working of the grease, further additives can be added as is well known to a man skilled in the art.
• the polar thickener is present in an amount in the range of from 1-25% by weight and the base oil is present in an amount in the range of from 74-99% by weight, based on the total amount of the first mixture.
• the non-polar thickener is present in an amount in the range of from 1-25% by weight and the base oil is present in an amount in the range of from 74-99% by weight, based on the total amount of the second mixture.
• the first mixture is present in an amount in the range of from 1-99% by weight and the second mixture is present in an amount in the range of from 1 -99% by weight, based on the total amount of the third mixture.
• the grease composition produced in accordance with the present invention displays unique properties by providing an improved multifunctional steady-state oil film on surfaces of bearings, gearing systems and couplings.
• the multifunctional properties of the steady-state oil film include conductivity, anti-wear, anti-fretting and anti-corrosion properties.
• grease compositions produced in accordance with the present invention give a significant higher bleeding of the oil from the grease composition at low temperatures (ambient temperature or less), providing good mechanical properties and excellent quiet running characteristics.
• the grease compositions that are produced in accordance with the present invention show in addition the following advantages: oil bleeding characteristics that are less temperature-dependent than the characteristics of lubricant grease compositions known in the state of the art; better transport of the oil within the grease structure, which leads to improved grease service life; good lubricating ability at low temperatures (below 100°C); good mechanical stability, i.e. "roll" stability/shear stability; improved grease noise characteristics, i.e. a lower noise level of the lubricated bearing in the SKF BEQUIET-test; long relubrication intervals.
• a further advantage of the grease composition according to the present invention is, as indicated earlier, the improved transport of the lubricating base oil within the grease structure.
• the present invention also relates to a grease composition obtainable by a method according to the present invention.
• the oil bleeds out at the surface of the grease structure.
• the oil separated at the surface should be replenished with oil from the "inside" of the grease structure through oil transport within the grease structure itself.
• this oil transport is often very poor, resulting in a reduction of the amount of oil available for lubrication at the surface of the grease structure, even though the grease structure as such still contains enough oil. This effect contributes to a reduction of grease life and even starvation, so that frequent relubrication is required.
• the oil transport within the grease structure is improved as can be seen from oil bleeding tests according to DIN 51817 which shows a three-dimensional shrinkage of the grease sample.
• the mechanical stability of the grease is dependent on the thickener used, the lubricating base oil used, as well as the additives used. Further, the mechanical properties of the grease can be influenced by "working" the grease after the thickener is mixed with the lubricating base oil, as is well known to a man skilled in the art of lubricants. Preferably, the grease is "worked” to a consistency desired and/or required for its intended use.
• the mechanical stability of the grease can be ascertained by means of tests known in the art, such as the Shell roll stability test.
• the grease will have a penetration after the Shell roll stability test (24 or 48 hrs at 80°C, 165 rpm), of max. 350.
• the consistency of the grease can be classified by means of the NLGI-class.
• the grease can usually be prepared to a NLGI-class range 1 to 3.
• An NLGI-class of 0 can be made, however, will usually give undue grease leakage.
• the grease composition according to the present invention can also suitably be in the form of a paste.
• the oil bleeding characteristics or oil separation properties of the grease compositions according to the present invention should be such that continuously an effective amount of oil is provided at the running temperatures of the bearing, which are influenced by the ambient temperature.
• the grease composition according to the present invention provides acceptable oil separation at temperatures as low as 0°C. Methods for the determination of oil bleeding characteristics are well known to a man skilled in the art, see for example DIN 51817.
• the viscosity of the separated oil must be acceptable, and preferably be constant.
• the amount of noise produced by the lubricated bearing during service should obviously be as low as possible. Also, the noise produced by a bearing gives an indication of efficiency of the lubrication process and the amount of damage by particle overrolling occurring in the bearing.
• the noise level produced by a bearing is not only dependent on the properties of the bearing itself and on the conditions under which the bearing is operated, but also on the noise characteristics of the grease composition used.
• Grease noise characteristics can be determined by means of the SKF BEQUIET grease noise tester, which is described in the SKF publication E4147.
• the above properties of the final grease composition are of course also dependent on the properties of the base oil and additives used in the final grease composition, as is well known to a man skilled in the art.
• the following parameters are also important: the ratio of the polymeric components in the thickener mixture, and the cooling speed during preparation and pre-working procedures.
• grease composition according to the present invention may also contain other grease additives that are known in the art, as long as they do not have a detrimental effect on the multiple thickener system, the base oil and/or the final grease composition.
• the present invention relates to the use of a grease composition prepared in accordance with the present method for lubricating a bearing, a gearing system or a coupling.
• Further uses of the lubricant grease compositions according to the present invention are e.g. agricultural machinery, bearings in dam-gates, low noise electric motors, large size electric motors, fans for cooling units, machine tool spindles, and a screw conveyor.
• Example 1 A grease composition A was prepared in accordance with the present invention, having the following composition: 10.9%wt polypropylene, 0.9%wt anti-oxidant 5.5%wt anti- corrosion and anti-wear additives, 73.6%wt mineral oil, and 9.1%wt of bismuth hydroxyl stearate, based on total weight of grease composition.
• This grease composition was produced by mixing the polypropylene, and the mineral oil at a temperature of 195°C, and quenching the mixture so obtained in 20 seconds to a temperature of 23°C (ambient temperature).
• the bismuth hydroxyl stearate, anti-oxidant, anti-corrosion, and anti-wear additives were added to the base grease so obtained during the milling which was carried out with a 3 -roll mill.
• Tables 1 and 2 The performance of this grease composition in terms of mechanical stability and anti-wear properties is shown in Tables 1 and 2.
• a grease composition B was prepared in accordance with the present invention, having the following composition: l l%wt of polypropylene, 79%wt mineral oil, and 10%wt of the same metal-based soap as used in Example 1, based on total weight of the grease composition.
• This grease composition was produced by mixing the polypropylene and the mineral oil at a temperature of 195°C, and quenching the mixture so obtained in 20 seconds to a temperature of 23°C (ambient temperature). The bismuth hydroxyl stearate was added to the base grease so obtained during the milling which was carried out with a 3-roll mill.
• the performance of this grease composition in terms of mechanical stability and anti-wear properties is shown in Tables 1 and 2.
• Example 3 Comparative example
• a grease composition C was prepared having the following composition: 12%wt polypropylene, l%wt anti-oxidant, 6%wt anti-corrosion and anti-wear additives, and 81%wt mineral oil, based on total weight of the grease composition.
• This grease composition was produced by mixing the polypropylene, and the mineral oil at a temperature of 195°C, and quenching the mixture so obtained in 20 seconds to a temperature of 23°C (room temperature).
• the anti-oxidant, anti-corrosion, and anti-wear additives were added to the base grease so obtained during the milling which was carried out with a 3-roll mill.
• Example 4 (Comparative example) A grease composition D was prepared having the following composition: l l%wt polypropylene and 89%wt mineral oil, based on total weight of the grease composition. This grease composition was produced by mixing the polypropylene and the mineral oil at a temperature of 195°C, and quenching the mixture so obtained in 20 seconds to a temperature of 23°C (ambient temperature).

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Lubricants (AREA)

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• 2009
  • 2009-08-05 WO PCT/EP2009/005665 patent/WO2010017909A1/en active Application Filing
  • 2009-08-05 ES ES09777668.6T patent/ES2559755T3/es active Active
  • 2009-08-05 EP EP09777668.6A patent/EP2334769B1/en not_active Not-in-force
  • 2009-08-05 BR BRPI0917870A patent/BRPI0917870A2/pt not_active IP Right Cessation

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