EP0096919B1 - High dropping-point lithium-complex grease composition having improved extreme pressure properties - Google Patents

High dropping-point lithium-complex grease composition having improved extreme pressure properties Download PDF

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Publication number
EP0096919B1
EP0096919B1 EP83200784A EP83200784A EP0096919B1 EP 0096919 B1 EP0096919 B1 EP 0096919B1 EP 83200784 A EP83200784 A EP 83200784A EP 83200784 A EP83200784 A EP 83200784A EP 0096919 B1 EP0096919 B1 EP 0096919B1
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EP
European Patent Office
Prior art keywords
lithium
boric acid
component
salt
grease composition
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Expired
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EP83200784A
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German (de)
French (fr)
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EP0096919A3 (en
EP0096919A2 (en
Inventor
Norimitsu Tanaka
Toshihiko Okamoto
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Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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Priority claimed from JP10060582A external-priority patent/JPS58219299A/en
Priority claimed from JP10060482A external-priority patent/JPS58219298A/en
Priority claimed from JP19903482A external-priority patent/JPS5989398A/en
Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Publication of EP0096919A2 publication Critical patent/EP0096919A2/en
Publication of EP0096919A3 publication Critical patent/EP0096919A3/en
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    • 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
    • C10M123/02—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 non-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
    • C10M113/00—Lubricating compositions characterised by the thickening agent being an inorganic material
    • C10M113/08—Metal compounds
    • 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
    • C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
    • C10M117/02—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
    • C10M117/04—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen containing hydroxy groups
    • 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/0606—Metal compounds 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/061—Carbides; Hydrides; Nitrides
    • C10M2201/0616—Carbides; Hydrides; Nitrides 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
    • C10M2201/0626—Oxides; Hydroxides; Carbonates or bicarbonates 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/065—Sulfides; Selenides; Tellurides
    • C10M2201/0656—Sulfides; Selenides; Tellurides 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/065—Sulfides; Selenides; Tellurides
    • C10M2201/066—Molybdenum sulfide
    • C10M2201/0666—Molybdenum sulfide 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/08—Inorganic acids or salts thereof
    • C10M2201/0806—Inorganic acids or salts thereof 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/085—Phosphorus oxides, acids or salts
    • C10M2201/0856—Phosphorus oxides, acids or salts 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/086—Chromium oxides, acids or salts
    • C10M2201/0866—Chromium oxides, acids or salts 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/087—Boron oxides, acids or salts
    • 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/087—Boron oxides, acids or salts
    • C10M2201/0876—Boron oxides, acids or salts 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/1013—Compounds containing silicon 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/102—Silicates
    • C10M2201/1026—Silicates 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
    • 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
    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C10M2207/124—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof
    • C10M2207/1245—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof 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
    • 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

Definitions

  • the present invention relates to a high dropping-point lithium-complex grease composition having improved extreme pressure properties.
  • lithium-complex grease compositions which contain (a) as gelling component e.g. a lithium soap of a C, 2 -C 24 hydroxy fatty acid and (b) as a complexing metal salt e.g. a lithium salt of a boric acid.
  • gelling component e.g. a lithium soap of a C, 2 -C 24 hydroxy fatty acid
  • complexing metal salt e.g. a lithium salt of a boric acid
  • the present grease compositions may also contain such anti-noise additives
  • the purpose of the present invention is to render extreme-pressure properties to high dropping-point lithium-complex grease compositions of the above type.
  • a grease which comprises a lubricating oil, lithium hydroxy stearate, an alkali metal salt of a boric acid, and an alkaline earth metal salt of a boric acid.
  • the lithium salt of a boric acid is less preferred.
  • the combination of the metal salts of boric acid gives the grease improved extreme-pressure properties.
  • This invention therefore provides a high dropping-point lithium-complex grease composition having improved extreme pressure properties, comprising a lubricating oil and the following components:
  • Any conventional lubricating oil can be used. While a typical one is a mineral oil, use can also be made, singly or in combination with the mineral oil, of a synthetic oil including ester oils, such as a diester oil, e.g. dioctyl azelate, and a tetraester oil, e.g.
  • V.I. viscosity index
  • the lubricating oil may have a viscosity ranging from about 2 to 500 cSt, preferably from 20 to 200 cSt, at 40°C.
  • the C, 2 to C 24 hydroxy fatty acids include saturated or unsaturated monocarboxylic fatty acids containing a hydroxyl radical, especially those acids containing 18 carbon atoms and a hydroxyl radical in the 9-, 10- or 12-position, such as 12-hydroxy stearic acid and ricinolic acid.
  • the lithium salts of the above fatty acids and hydroxy fatty acids can be singly used or combinedly with one or more of others.
  • said carboxylic acids can be reacted with lithium hydroxide not only in the form of free acids but also as glycerides.
  • Suitable salts are lithium metaborate, lithium diborate, lithium tetraborate, lithium pentaborate, lithium perborate and lithium ortho borate, such as the monolithium salt of ortho boric acid (H 3 BO 3 ).
  • Suitable salts are potassium sodium, alkaline earth metal (e.g. Ca, Ba or Mg) and zinc metaborate, diborate, tetraborate, pentaborate, perborate and ortho borate. Partial as well as full salts are suitable.
  • the grease composition according to the present invention can be prepared by uniformly admixing and finely dispersing the three components (a), (b) and (c) in the base oil mentioned above. While the amounts of these three components compounded in the base oil above are not necessarily critical but can be variable for individual components, it is generally advantageous to use them in the following proportions per 100 weight parts (pbw) of the base oil;
  • Component (a)/Component (b) mol ratio 0.5 to 10, especially 1 to 5.
  • the present grease composition can also be prepared as follows.
  • the base oil is admixed with a hydroxy fatty acid for forming a component (a), followed by an e.g., equivalent, amount of LiOH to form a soap.
  • a boric acid for a component (b) is admixed, followed successively by an, e.g. equivalent, amount of LiOH, another portion of a boric acid and an e.g., equivalent, amount of a metal compound of a metal of component (c), e.g. an oxide or hydroxide of K, Na, an alkaline earth metal or Zn.
  • the total of the two portions above of boric acid may be admixed simultaneously in the first mixture, followed by LiOH and said metal compound.
  • lubricant-additives such as neutral or basic metallic detergents, such as basic Ca salicylate, or ashless dispersants, rust inhibitors (e.g., paraffin oxide, amino imidazoline or barium dinonylnaphthalene-sulphonate), oxidation inhibitors (e.g. 2,6- ditertiary butyl-4-methylphenol), N-phenyl-a-naphthylamine or diphenylamine octylate) and conventional extreme-pressure additives (e.g. zinc naphthenate or other zinc compounds such as zinc dithiophosphates or zinc-oxide, lead naphthenate, sulphurized oils and fats, or tricresyl phosphate), in the proportions ordinarily employed.
  • neutral or basic metallic detergents such as basic Ca salicylate, or ashless dispersants
  • rust inhibitors e.g., paraffin oxide, amino imidazoline or barium dinonylnaphthalen
  • the present grease compositions can be used, for example, for the lubrication of the bearings of electric motors as well as of the wheel bearings in automotive bearing/axle integrated structures.
  • Component (a) was lithium 12-hydroxy stearate, component (b) lithium borate and component (c) potassium borate.
  • This grease was prepared in situ by mixing and heating 9.00% w of 12-hydroxy stearic acid, 2.96% w boric acid, 2.33% w lithium hydroxide, 0.45% w potassium hydroxide and 85.26% w mineral lubricating oil.

Description

  • The present invention relates to a high dropping-point lithium-complex grease composition having improved extreme pressure properties.
  • In the co-pending European patent application 83200077 (EP-A-84910) high dropping-point lithium-complex grease compositions are described, which contain (a) as gelling component e.g. a lithium soap of a C,2-C24 hydroxy fatty acid and (b) as a complexing metal salt e.g. a lithium salt of a boric acid.
  • Furthermore a high molecular weight viscosity-index improver, and/or succinimide type dispersant and/or metal salt detergent is added in order to provide the grease compositions with improved anti-noise properties..
  • Although the present grease compositions may also contain such anti-noise additives, the purpose of the present invention is to render extreme-pressure properties to high dropping-point lithium-complex grease compositions of the above type.
  • It has been found that this purpose can surprisingly be met by combining the above-mentioned components (a) and (b) with a component (c) which is a class of certain metal salts of a boric acid.
  • From US―A―3,907,691 a grease is known which comprises a lubricating oil, lithium hydroxy stearate, an alkali metal salt of a boric acid, and an alkaline earth metal salt of a boric acid. The lithium salt of a boric acid is less preferred. The combination of the metal salts of boric acid gives the grease improved extreme-pressure properties.
  • It has now been found that very high-dropping point grease having improved extreme-pressure properties can be obtained by using salts other than alkaline earth metal salts.
  • This invention therefore provides a high dropping-point lithium-complex grease composition having improved extreme pressure properties, comprising a lubricating oil and the following components:
    • (a) at least one lithium soap of a Clg-C24 hydroxy fatty acid,
    • (b) at least one lithium salt of a boric acid, and
    • (c) at least one other metal salt of a boric acid, characterized in that the metal salt of component (c) is selected from
      • (1) a potassium salt,
      • (2) a sodium salt, and
      • (3) a zinc salt.
      • (c) at least one metal salt selected from the group consisting of
      • 1) a potassium salt of a boric acid,
      • 2) a sodium salt of a boric acid,
      • 3) an alkaline earth metal salt of a boric acid, and
      • 4) a zinc salt of a boric acid.
    Lubricating oil
  • Any conventional lubricating oil can be used. While a typical one is a mineral oil, use can also be made, singly or in combination with the mineral oil, of a synthetic oil including ester oils, such as a diester oil, e.g. dioctyl azelate, and a tetraester oil, e.g. the pentaerythritol ester of an aliphatic monocarboxylic acid, or poly-alpha-olefin oligomers, such as octene-1/decene-1 copolymers, having a viscosity of 41.0 cSt at 37.8°C, a viscosity index (V.I.) of 130 and a flash point of 223°C.
  • The lubricating oil may have a viscosity ranging from about 2 to 500 cSt, preferably from 20 to 200 cSt, at 40°C.
    • Component (a)
  • The C,2 to C24 hydroxy fatty acids include saturated or unsaturated monocarboxylic fatty acids containing a hydroxyl radical, especially those acids containing 18 carbon atoms and a hydroxyl radical in the 9-, 10- or 12-position, such as 12-hydroxy stearic acid and ricinolic acid.
  • The lithium salts of the above fatty acids and hydroxy fatty acids can be singly used or combinedly with one or more of others. In addition, when said lithium salts are prepared, said carboxylic acids can be reacted with lithium hydroxide not only in the form of free acids but also as glycerides.
    • Component (b)
  • Suitable salts are lithium metaborate, lithium diborate, lithium tetraborate, lithium pentaborate, lithium perborate and lithium ortho borate, such as the monolithium salt of ortho boric acid (H3BO3).
    • Component (c)
  • Suitable salts are potassium sodium, alkaline earth metal (e.g. Ca, Ba or Mg) and zinc metaborate, diborate, tetraborate, pentaborate, perborate and ortho borate. Partial as well as full salts are suitable.
  • The above components (a), (b) and (c) can be present as separate compounds or as a mixed compound as explained hereinafter.
    • Preparation of these grease compositions
  • The grease composition according to the present invention can be prepared by uniformly admixing and finely dispersing the three components (a), (b) and (c) in the base oil mentioned above. While the amounts of these three components compounded in the base oil above are not necessarily critical but can be variable for individual components, it is generally advantageous to use them in the following proportions per 100 weight parts (pbw) of the base oil;
    • Component (a): 2 to 40 weight parts, preferably 5 to 30 weight parts
    • Component (b): 0.05 to 20 weight parts, preferably 0.1 to 10 weight parts
    • Component (c): 0.05 to 20 weight parts, preferably 0.1 to 10 weight parts
  • Also, it is particularly preferable to use the components (a) and (b) in the following mol ratio within the above ranges of the proportions;
  • Component (a)/Component (b) mol ratio=0.5 to 10, especially 1 to 5.
  • The present grease composition can also be prepared as follows. The base oil is admixed with a hydroxy fatty acid for forming a component (a), followed by an e.g., equivalent, amount of LiOH to form a soap. Then, a boric acid for a component (b) is admixed, followed successively by an, e.g. equivalent, amount of LiOH, another portion of a boric acid and an e.g., equivalent, amount of a metal compound of a metal of component (c), e.g. an oxide or hydroxide of K, Na, an alkaline earth metal or Zn. Alternatively, the total of the two portions above of boric acid may be admixed simultaneously in the first mixture, followed by LiOH and said metal compound.
  • These procedures, which result into so called mixed compounds, may be carried out at 70 to 90°C. Subsequently, the reaction mixture is dehydrated gradually at e.g. 140 to 225°C to complete the preparation.
  • It is also possible to add an aqueous slurry of LiOH. H20, the metal compound of a metal of components (c) and boric acid to e.g. an autoclave containing lubricating oil and hydroxy fatty acid.
  • In the grease composition according to the present invention, use can be made, in addition to the three components (a), (b) and (c) above, of other metal borates or other lubricant-additives, such as neutral or basic metallic detergents, such as basic Ca salicylate, or ashless dispersants, rust inhibitors (e.g., paraffin oxide, amino imidazoline or barium dinonylnaphthalene-sulphonate), oxidation inhibitors (e.g. 2,6- ditertiary butyl-4-methylphenol), N-phenyl-a-naphthylamine or diphenylamine octylate) and conventional extreme-pressure additives (e.g. zinc naphthenate or other zinc compounds such as zinc dithiophosphates or zinc-oxide, lead naphthenate, sulphurized oils and fats, or tricresyl phosphate), in the proportions ordinarily employed.
  • The present grease compositions can be used, for example, for the lubrication of the bearings of electric motors as well as of the wheel bearings in automotive bearing/axle integrated structures.
  • In the following, the present greases are further illustrated by means of examples (the boric acid used was ortho boric acid).
    • Example 1
  • Component (a) was lithium 12-hydroxy stearate, component (b) lithium borate and component (c) potassium borate.
  • This grease was prepared in situ by mixing and heating 9.00% w of 12-hydroxy stearic acid, 2.96% w boric acid, 2.33% w lithium hydroxide, 0.45% w potassium hydroxide and 85.26% w mineral lubricating oil.
    • Example 2
  • As Example 1 except for (c) which was sodium borate.
    • Example 3 (Comparative Example)
  • As Example 1 except for (c) which was calcium borate.
    • Example 4
  • As Example 1 except for (c) which was zinc borate.
  • Test results of these greases are shown in the following Table.
    Figure imgb0001

Claims (4)

1. High dropping-point lithium-complex grease composition having improved extreme-pressure properties, comprising a lubricating oil and the following components:
(a) at least one lithium soap of a C12 to C24 hydroxy fatty acid, -
(b) at least one lithium salt of a boric acid, and
(c) at least one other metal salt of a boric acid, characterized in that the metal salt of component (c) is selected from
(1) a potassium salt,
(2) a sodium salt, and
(3) a zinc salt.
2. Composition as claimed in claim 1, characterized in that the boric acid is ortho boric acid.
3. Composition as claimed in claim 1 or 2, characterized in the proportions per 100 pbw of base oil are:
Component (a): 2-40 pbw
Component (b): 0.05-20 pbw
Component (c): 0.05-20 pbw
4. Process for the preparation of a composition according to any one of claims 1-3 comprising mixing and heating together in a lubricating oil a C12 to C24 hydroxy fatty acid, a boric acid, lithium hydroxide and an oxide or a hydroxide from a metal selected from the group consisting of potassium, sodium and zinc.
EP83200784A 1982-06-14 1983-06-01 High dropping-point lithium-complex grease composition having improved extreme pressure properties Expired EP0096919B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP10060582A JPS58219299A (en) 1982-06-14 1982-06-14 Lithium complex grease composition having high extreme-pressure property and high dropping point
JP10060482A JPS58219298A (en) 1982-06-14 1982-06-14 Lithium complex grease composition having high extreme-pressure property and high dropping point
JP100604/82 1982-06-14
JP100605/82 1982-06-14
JP199034/82 1982-11-15
JP19903482A JPS5989398A (en) 1982-11-15 1982-11-15 Grease composition

Publications (3)

Publication Number Publication Date
EP0096919A2 EP0096919A2 (en) 1983-12-28
EP0096919A3 EP0096919A3 (en) 1985-01-16
EP0096919B1 true EP0096919B1 (en) 1987-09-02

Family

ID=27309261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200784A Expired EP0096919B1 (en) 1982-06-14 1983-06-01 High dropping-point lithium-complex grease composition having improved extreme pressure properties

Country Status (2)

Country Link
EP (1) EP0096919B1 (en)
DE (1) DE3373313D1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3535713C1 (en) * 1985-10-05 1987-04-02 Texaco Technologie Europa Gmbh Grease for high application temperatures
JPH0633388B2 (en) * 1986-04-30 1994-05-02 シエル・インターナシヨナル・リサーチ・マートスハツペイ・ベー・ヴエー Lubricating grease composition
GB2215346B (en) * 1988-03-09 1991-09-04 Exxon Research Engineering Co Lubricating grease
US5641730A (en) * 1995-11-29 1997-06-24 Chevron Chemical Company Grease composition with improved antiwear properties
CN103351913B (en) * 2013-07-12 2015-04-08 新乡市恒星化工有限责任公司 Special lubricating grease for shock absorber as well as preparation method and application thereof
CN113388436B (en) * 2021-06-18 2023-05-23 中国石油化工股份有限公司 Boric acid composite lithium-based lubricating grease composition and preparation method and application thereof
CN115960658A (en) * 2022-12-30 2023-04-14 无锡飞天润滑油科技股份有限公司 Lubricating grease for section cutting machine and preparation method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1001658B (en) * 1972-12-30 1976-04-30 Texaco Ag LUBRICANT GREASE WITH LITHIUM SOAPS
US3907691A (en) * 1974-07-15 1975-09-23 Chevron Res Extreme-pressure mixed metal borate lubricant
US4100080A (en) * 1977-03-14 1978-07-11 Chevron Research Company Greases containing borate dispersions as extreme-pressure additives

Also Published As

Publication number Publication date
DE3373313D1 (en) 1987-10-08
EP0096919A3 (en) 1985-01-16
EP0096919A2 (en) 1983-12-28

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