摘要:
A grease composition for a high-speed rolling bearing contains an alkyl diphenyl ether oil as a base oil, and at least one of diurea compounds represented by the formula (1) ##STR1## wherein R.sup.1 denotes a divalent aromatic hydrocarbon residue having 6 to 15 carbon atoms and R.sup.2 and R.sup.3 may be the same or different and each represent a cyclohexyl group, a cyclohexyl derivative group having 7 to 12 carbon atoms or an alkyl group having 8 to 20 carbon atoms. The diurea compound is contained as a thickener in the base oil. The content in percent of the cyclohexyl group and the cyclohexyl derivative group in the diurea compound is such that a value of [{(numbers of cyclohexyl groups and derivative groups thereof)/(numbers of cyclohexyl groups and derivative groups thereof plus numbers of alkyl groups)}.times.100] is equal to 50 to 100%.
摘要:
A grease composition for a high speed anti-friction bearing contains, in a synthetic lubricant base oil, (A) 2 to 30 wt. % of a thickening agent consisting of an urea comopund, (B) 0.2 to 30 wt. % of sorbitan monooleate, (C) 0.2 to 3.0 wt.% of barium sulfonate, and (D) 0.2 to 3.0 wt. % of barium lanolate, as indispensable components, each weight percentage being based on the total weight of the composition.
摘要:
A grease composition for a rolling bearing comprising, based on 100 parts by weight of a base oil, 10 to 60 parts by weight of a mixture of diurea compounds as a thickener having a composition of 25 to 90 mol % of a diurea compound represented by the formula (1), 9 to 50 mol % of a diurea compound represented by the formula (2), 1 to 30 mol % of a diurea compound represented by the formula (3), wherein R.sup.1 stands for an aromatics-containing hydrocarbon group having 7 to 12 carbon atoms, R.sup.2 stands for a divalent aromatics-containing hydrocarbon group having 6 to 15 carbon atoms, and R.sup.3 stands for a cyclohexyl group or an alkylcyclohexyl group having 7 to 12 carbon atoms, a value of (number of R.sup.1 /(number of R.sup.1 +number of R.sup.3)) in the mixture being 0.55 to 0.95. ##STR1##
摘要:
A grease composition for high-temperature, high-speed and high-load bearings comprises (i) a lubricating base oil composed of an alkyldiphenyl ether lubricant as an essential ingredient and having a kinematic viscosity of 90-160 cSt at 40.degree. C., and (ii) 22-30 wt. %, based on the grease composition, of a diurea compound as a thickener. The diurea compound is represented by the following formula: ##STR1## wherein R.sub.2 means an aromatic hydrocarbon group having 6-15 carbon atoms, R.sub.1 and R.sub.3 denote an aromatic hydrocarbon group having 6-12 carbon atoms or a linear alkyl group having 8-20 carbon atoms, and the proportion of aromatic hydrocarbon groups in R.sub.1 and R.sub.3 is 70-95 mole %. The NLGI thickness grade of said composition is in a range of from No. 1 to No. 3.
摘要:
This invention is to provide a conductive grease which is less to decrease conductivity as a time passes. The conductive grease comprises a base oil, a thickener, a conductive solid powder, and at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent, wherein an amount of the conductive solid powder added is 0.1 to 10 wt %, and an amount of the at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent added is 0.1 to 10 wt %. Further, the conductive grease comprises the base oil and at least one of conductive additives, and the conductive additives are fibrous carbon, metallic particle, metallic compound particle and carbon nano-tube. The conductive grease to be packed into the rolling bearing comprises conductive fine particles such as carbon black and has an oil separation degree of 2% or lower. A ball bearing to be favorably used at high temperature comprises an inner race and an outer race, and a plurality of balls freely rotating between both races, and the conductive grease packed into a space defined between both races and holding the plural balls therein, and the conductive grease comprises the base oil, a thickener comprising fluorine compound or silicone compound and 0.2 to 10 wt % of the carbon black.
摘要:
The present invention provides a grease composition excellent in both rust-proofing properties and safety. The grease composition comprises a lubricating base oil and a thickener, and further comprises a lipophilic organic inhibitor, a nonionic surface active agent and a hydrophilic organic inhibitor selected from the group consisting of lanolin fatty acid derivative and alkanolamine derivative modified with a hydrophilic group each in an amount of from 0.1 to 10% by weight based on the total weight of said grease composition.
摘要:
The present invention provides a grease composition which is excellent in peel resistance, not to mention lubricity, as compared with the prior art products. A novel grease composition for rolling bearing is provided, comprising a base oil, an extender, an inorganic compound-based filler having an average particle diameter of not more than 2 &mgr;m and zinc dithiocarbamate.
摘要:
A grease composition comprising a base oil containing not less than 10% by weight of an ester oil based on the total base oil and having a kinematic viscosity of 50 to 200 mm.sup.2 /sec at 40.degree. C. and 15 to 35% by weight, based on the total grease composition, of a diurea compound represented by formula (I): ##STR1## wherein R.sub.2 represents an aromatic hydrocarbon group having 6 to 15 carbon atoms; and R.sub.1 and R.sub.3, which may be the same or different, each represent an aromatic hydrocarbon group having 6 to 12 carbon atoms or an aliphatic hydrocarbon group having 8 to 20 carbon atoms, the proportion of the aromatic hydrocarbon groups in the total of R.sub.1 and R.sub.3 being 50 to 100 mol %. When applied to outer race rotating bearings, the grease composition is excellent in flaking resistance, leak resistance, and low noise properties and prevents premature seizing under high temperature and high speed conditions.
摘要:
A lithium complex grease for rolling bearings which has high dropping points and is capable of maintaining for a long time an excellent stability of a thickener micell under a high temperature, high adhesion, heat resistance, water resistance, rust resistance, load resistance, low noises and other high-level properties and a method of producing such lithium complex grease. The lithium complex greases are characterized in that base greases containing a base oil, a fatty acid having 12 to 24 carbon atoms, a dicarboxylic acid having 4 to 12 carbon atoms and/or a dicarboxylic acid ester and a lithium hydroxide are thickened with a phosphate ester and/or a phosphite ester. A method of producing the lithium complex greases is characterized in that the base greases having the above composition are added by the phosphate ester and/or the phosphite ester, and thickened under a reaction at a temperature of more than 210.degree. C. (410.degree. F.).
摘要:
This invention is to provide a conductive grease which is less to decrease conductivity as a time passes. The conductive grease comprises abase oil, a thickener, a conductive solid powder, and at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent, wherein an amount of the conductive solid powder added is 0.1 to 10 wt %, and an amount of the at least one kind of a wear inhibitor, an extreme pressure agent and an oiliness agent added is 0.1 to 10 wt %. Further, the conductive grease comprises the base oil and at least one of conductive additives, and the conductive additives are fibrous carbon, metallic particle, metallic compound particle and carbon nano-tube. The conductive grease to be packed into the rolling bearing comprises conductive fine particles such as carbon black and has an oil separation degree of 2% or lower. A ball bearing to be favorably used at high temperature comprises an inner race and an outer race, and a plurality of balls freely rotating between both races, and the conductive grease packed into a space defined between both races and holding the plural balls therein, and the conductive grease comprises the base oil, a thickener comprising fluorine compound or silicone compound and 0.2 to 10 wt % of the carbon black.