Abstract:
This invention provides a hydraulic oil comprising: 1) a lubricant base oil having an average molecular weight greater than 475, a viscosity index greater than 140, and a weight percent olefins less than 10; and 2) an antiwear hydraulic oil additive package. The hydraulic oil of this invention has an air release by ASTM D 3427-03 of less than 0.8 minutes at 50 degrees C, and a sequence II foam tendency by ASTM D 892-03 of less than 50 ml. We describe a process for making the hydraulic oil of this invention, and a method of operating a hydraulic pump without pump cavitation using the hydraulic oil of this invention.
Abstract translation:本发明提供一种液压油,其包括:1)平均分子量大于475,粘度指数大于140,烯烃重量百分比小于10的润滑剂基础油; 和2)抗磨液压油添加剂包。 本发明的液压油在50℃下通过ASTM D 3427-03具有小于0.8分钟的空气释放,并且ASTM D 892-03的序列II泡沫倾向小于50ml。 我们描述了制造本发明的液压油的方法,以及使用本发明的液压油操作没有泵气蚀的液压泵的方法。
Abstract:
A disc drive storage system includes a housing having a central axis, a stationary member that is fixed with respect to the housing and coaxial with the central axis, and a rotatable member that is rotatable about the central axis with respect to the stationary member. A hydro bearing interconnects the stationary member and the rotatable member and includes a lubricating fluid having a base fluid and an additive for reducing the tendency of bubble formation in the lubricating fluid.
Abstract:
The invention relates to a method for defoaming liquid hydrocarbons, whereby these vinyl alkylether polymerizates of general formula (I), in which R represents a saturated or unsaturated, straight or branched alkyl radical with 2 to 18 C atoms, and n represents a number > 1, are added in quantities ranging from 1 to 2000 ppm.
Abstract:
Methods for achieving favorable efficiency properties are disclosed including methods for blending a lubricant composition and lubricant compositions. In one embodiment, the method comprises the steps of obtaining at least one base stock and at obtaining at least one base stock chosen to have a favorable air release properties, obtaining at least one additive, blending at least one base stock and at least one additive to achieve a favorable effective bulk modulus through air release property, bulk modulus, and using a relationship between density and bulk modulus.
Abstract:
This invention provides a hydraulic oil comprising: 1) a lubricant base oil having an average molecular weight greater than 475, a viscosity index greater than 140, and a weight percent olefins less than 10; and 2) an antiwear hydraulic oil additive package. The hydraulic oil of this invention has an air release by ASTM D 3427-03 of less than 0.8 minutes at 50 degrees C, and a sequence II foam tendency by ASTM D 892-03 of less than 50 ml. We describe a process for making the hydraulic oil of this invention, and a method of operating a hydraulic pump without pump cavitation using the hydraulic oil of this invention.
Abstract translation:本发明提供一种液压油,其包括:1)平均分子量大于475,粘度指数大于140,烯烃重量百分比小于10的润滑剂基础油; 和2)抗磨液压油添加剂包。 本发明的液压油在50℃下通过ASTM D 3427-03具有小于0.8分钟的空气释放,并且ASTM D 892-03的序列II泡沫倾向小于50ml。 我们描述了制造本发明的液压油的方法,以及使用本发明的液压油操作没有泵气蚀的液压泵的方法。
Abstract:
Foaming of a lube oil comprising a base stock derived from wax isomeration and an additive package is effectively reduced to within specification limits of 50 ml/ml over a temperature range of from at least 24 DEG C to 93.5 DEG C by adding to the oil an effective amount of an antifoamant exhibiting a spreading coefficient of at least about 2 mN/m. This has been found to be particularly effective in reducing foaming of lube oils containing a mixture of a wax isomerate oil and a petroleum oil fraction. Antifoamants typically used with conventional lube oils containing one or more petroleum fraction base stocks, but which do not exhibit a spreading coefficient of at least 2 mN/m with the wax isomerate containing oil, have been found not to be effective in reducing the foaming of the oil.
Abstract:
The present invention relates to diesel fuel and lubrication oil defoaming agents, and crude oil demulsifiers, as well as methods for using same. In particular, the defoaming agents and demulsifiers are comprised of copolymers which have structures constituting a backbone of polysiloxane onto which is grafted an organic group. These structures comprise a polymer of the formula MDxD'yD"zM, where M is O.5Si(CH3)3, D is a OSi(CH3)2, D' is OSi(CH3)R, D" is OSi(CH3)R', R is a polyhydric C6-C28 organic group, R' is a phenol derivative or a long chain aliphatic group or polyethers, z is between 0 and 80, x+y+z is between 10-200, x/z is >/= 1, and x/(y+z) is between about 1 and about 5, or formula M'DaM' where M' is O.5Si(CH3)2R, a is between 4-10, and R and D are the same as defined above.
Abstract:
Defoaming agents comprising a silicone oil and silica particulates, lubricating oil compositions comprising the defoaming agent, methods of lubrication using a lubricating oil composition comprising the defoaming agent, and methods of reducing the foaming tendency/stability and/or improving the air release rates of non-aqueous fluids, such as lubricant oils, are provided.
Abstract:
The invention relates to substances for defoaming aqueous media. Said substances contain urea derivatives of formula (I) in the form of solid particles as defoaming agents. In formula (I), R1 is a hydrocarbon group comprising 4 to 30 carbon atoms, a hydrocarbon group comprising 4 to 24 carbon atoms and a nitrogen atom, or a hydrocarbon group comprising 4 to 30 carbon atoms and a carbonyl group, R2 is a hydrogen atom or a hydrocarbon group comprising 1 to 24 carbon atoms, R3 is a hydrogen atom or a hydrocarbon group comprising 1 to 24 carbon atoms, R4 is an organic group comprising 2 to 30 carbon atoms, and n is a number between 0 and 5. The urea derivatives are obtained by reacting isocyanates with amines in a carrier medium. The invention is characterized in that the reaction is carried out in the presence of a monovalent alcohol of formula (VI) R8-OH, in which R8 is a linear or branched, preferably branched, alkyl group comprising 6 to 10 carbon atoms.
Abstract:
Die Erfindung betrifft Mittel zur Entschäumung wässriger Medien, die als Entschäumer Harnstoffderivate der Formel (I) wobei R 1 ein Kohlenwasserstoffrest mit 4 bis 30 Kohlenstoffatomen oder ein Kohlenwasserstoffrest mit 4 bis 24 Kohlenstoffatomen und einem Stickstoffatom oder ein Kohlenwasserstoffrest mit 4 bis 30 Kohlenstoffatomen und einer Carbonylgruppe, R 2 ein Wasserstoffatom oder ein Kohlenwasserstoffrest mit 1 bis 24 Kohlenstoffatomen, R 3 ein Wasserstoffatom oder ein Kohlenwasserstoffrest mit 1 bis 24 Kohlenstoffatomen, R 4 ein organischer Rest mit 2 bis 30 Kohlenstoffatomen und n 0 bis 5 sind, in Form von Feststoffpartikeln enthalten, wobei die Harnstoffderivate durch Umsetzung von Isocyanaten mit Aminen in einem Trägermedium erhalten werden, dadurch gekennzeichnet, dass die Umsetzung in Gegenwart eines einwertigen Alkohols der Formel (VI) R 8 -OH mit R 8 = linearer oder verzweigter, vorzugsweise verzweigter Alkylrest mit 6 bis 10 Kohlenstoffatomen, durchgeführt wird.