Granted Patent B2

US 12,187,975 · App. 18/358,987 · Granted Jan 7, 2025

Inventors: Christof Schmitz (Munich, DE); Wolfgang Tiepermann (Weilheim, DE); Raphaela Makrutzki (Dietramszell-Ascholding, DE); Stefan Seemeyer (Wolfratshausen, DE)

Assignee: KLUEBER LUBRICATION MUENCHEN GMBH & CO. KG

C10M169/02C10M107/02C10M117/08C10M119/24C10M123/04C10M2205/0206C10M2207/284C10M2217/0456C10N2040/06C10N2050/10

Abstract

Claims (37)

1. A method of lubricating surfaces of plastic-containing friction partners, the method comprising:

providing a lubricant grease composition having an upper use temperature of at least 90° C., the lubricant grease composition comprising:

a base oil, wherein the base oil comprises one or more of polyalphaolefins, metallocene polyalphaolefins, and naphthenic mineral oils according to the API GroupI classification; and

a thickener comprising an aluminum-based complex soap and a polyurea thickener; and

lubricating the surfaces of plastic-containing friction partners or of a combination of metallic and plastic-containing friction partners;

wherein the polyurea thickener is a reaction product of a diisocyanate selected from the group consisting of 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4′-diisocyanatodiphenylmethane, 2,4′-diisocyanatophenyl-methane, 4,4′-diisocyanatodiphenyl, 4,4′-diisocyanato-3,3′-dimethylphenyl, 4,4′-diisocyanto-3,3′-dimethyl-phenylmethane, which may be used individually or in combination, with an amine of the general formula R′2-N—R, or a diamine of the general formula R′2-N—R—NR′2 where R is an aryl, alkyl or alkylene radical having 2 to 22 carbon atoms and R′ is identical or different and is a hydrogen or an alkyl, alkylene or aryl radical, or with mixtures of amines and diamines;

wherein the aluminum-based complex soap has the formula (A)

where R is an aliphatic hydrocarbyl radical having 4 to 28 carbon atoms;

wherein R is derived from one or more fatty acids selected from the group consisting of lauric acid, palmitic acid, myristic acid, and stearic acid;

wherein the base oil has a kinematic viscosity of 18 mm 2 /s to 20,000 mm 2 /s at 40° C.

wherein a proportion of the polyurea thickener in the lubricant grease composition is 1% by weight to 11% by weight based on the total weight of the lubricant grease composition; and

wherein a proportion of the aluminum-based complex soap in the lubricant grease composition is from 1% by weight to 11% by weight based on the total weight of the lubricant grease composition.

2. A method of lubricating surfaces of plastic-containing friction partners, the method comprising:

providing a lubricant grease composition having an upper use temperature of at least intermittently at least 90° C., the lubricant grease composition comprising:

a base oil, wherein the base oil comprises one or more of polyalphaolefins, metallocene polyalphaolefins, and naphthenic mineral oils according to the API Group I classification; and

a thickener comprising an aluminum-based complex soap and a polyurea thickener; and

lubricating the surfaces of plastic-containing friction partners or of a combination of metallic and plastic-containing friction partners

wherein the polyurea thickener is a reaction product of a diisocyanate selected from the group consisting of 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4′-diisocyanatodiphenylmethane, 2,4′-diisocyanatophenyl-methane, 4,4′-diisocyanatodiphenyl, 4,4′-diisocyanato-3,3′-dimethylphenyl, 4,4′-diisocyanto-3,3′-dimethyl-phenylmethane, which may be used individually or in combination, with an amine of the general formula R′2-N—R, or a diamine of the general formula R′2-N—R—NR′2 where R is an aryl, alkyl or alkylene radical having 2 to 22 carbon atoms and R′ is identical or different and is a hydrogen or an alkyl, alkylene or aryl radical, or with mixtures of amines and diamines;

wherein the aluminum-based complex soap has the formula (A)

where R is an aliphatic hydrocarbyl radical having 4 to 28 carbon atoms;

wherein R is derived from one or more fatty acids selected from the group consisting of lauric acid, palmitic acid, myristic acid, and stearic acid;

wherein the base oil has a kinematic viscosity of 18 mm 2 /s to 20,000 mm 2 /s at 40° C.

wherein a proportion of the polyurea thickener in the lubricant grease composition is 1% by weight to 11% by weight based on the total weight of the lubricant grease composition; and

wherein a proportion of the aluminum-based complex soap in the lubricant grease composition is from 1% by weight to 11% by weight based on the total weight of the lubricant grease composition.

3. The method of claim 1 , wherein the lubricant grease composition has a use temperature range of −60° C. to +180°.

4. The method of claim 2 , wherein the lubricant grease is configured for lubrication of surfaces of components when the use temperature is maintained for a period of at least 10 minutes.

5. The method of claim 1 , wherein the combination of metallic and plastic-containing friction partners are in actuators in the automotive sector.

6. The method of claim 1 , wherein the lubricant grease composition has an oil separation according to ASTM D 6184-17 (24 h/100° C.) of less than 12% by weight and/or according to ASTM D 6184-17 (24 h/100° C., then 24 h/110° C.) of less than 16% by weight and/or according to ASTM D 6184-17 (24 h/100° C., then 24 h/110° C., then 24 h/120° C.) of less than 20% by weight.

7. The method of claim 1 , wherein the lubricant grease composition has the following composition:

55% to 96% by weight of base oil,

1% to 11% by weight of polyurea thickener,

1% to 11% by weight of aluminum-based complex soap,

1% to 30% by weight of additives, and

1% to 30% by weight of solid lubricants.

8. The method of claim 1 , wherein the lubricant grease composition has an oil separation according to ASTM D 6184-17 (24 h/100° C.) of less than 12% by weight.

9. The method of claim 1 , wherein the lubricant grease composition has an oil separation according to ASTM D 6184-17 (24 h/100° C.) of less than 6% by weight.

10. The method of claim 1 , wherein the lubricant grease composition has an upper use temperature of 110° C. to 180° C.

Assignments (2)

Priority Claims (1)

Continuity (2)

References Cited (19)