Abstract:
Procédé de traitement d'une surface comprenant une étape d'application, sur ladite surface, de molécules hydrophobes et/ou oléophobes et/ou d'application d'un épilame, ledit procédé comprenant une étape de prétraitement par un procédé plasma de ladite surface avant ladite étape d'application de molécules hydrophobes et/ou oléophobes et/ou d'application d'un épilame.
Abstract:
A synthetic ester composition which exhibits thermal and oxidative stability, lower friction coefficient and lower wear, wherein the ester composition comprises the reaction product of: a branched or linear alcohol having the general formula R(OH)m, wherein R is an aliphatic or cyclo-aliphatic group having from about 2 to 20 carbon atoms and n is at least 2; and at least one branched mono-carboxylic acid which has a carbon number in the range between about C5 to C13; wherein the synthetic ester composition has between about 5-35% unconverted hydroxyl groups, based on the total amount of hydroxyl groups in the branched or linear alcohol.
Abstract:
The present invention relates to additives for lubricating oils and greases which endow said lubricating oils and greases extremely good performance characteristics under boundary lubrication conditions. Such additives are derivatives of monofunctional or difunctional perfluoropolyethers constituted by mercaptans, sulfides, disulfides, phosphines, phosphine-oxides and phosphoric acid triesters.
Abstract:
Concentrated lubricant compositions, dilutable for use in high temperature metal forming processes and containing a triaryl phosphate ester; a non-ionic and/or amphoteric surfactant, an organic sulfur-containing extreme pressure additive, an amine salt of an organic acid, and, optionally, sodium thiosulfate, exhibit improved performance in forming operations and produce parts with less part to part variation.
Abstract:
Lubricating oils of enhanced oxidation stability are obtained by adding to the lubricating oil a mixture comprising carbodiimide as acid scavenger and either n-phenyl-1-naphthyl amine or its substituted derivatives as amine anti-oxidant.
Abstract:
Disclosed is an aircraft hydraulic fluid comprising a novel combination of additives and organic phosphate basestocks which provides excellent results in scavenging acid generated by the partial esters of phosphoric acid, in controlling erosion in the formulation and in reducing electrodeposited solids.
Abstract:
A fluid composition suitable for use as an aircraft hydraulic fluid is disclosed. The fluid composition comprises a fire resistant phosphate ester base stock comprising between about 10% and about 100% by weight of a trialkyl phosphate, between about 0% and about 70% by weight of a dialkyl aryl phosphate, and from about 0% to about 25% by weight of an alkyl diaryl phosphate, with the proviso that the sum of the proportionate amount of each base stock component must equal 100%. The alkyl substituents of the trialkyl phosphate, the dialkyl aryl phosphate, and the alkyl diaryl phosphate contain between 3 and 8 carbon atoms, preferably between 4 and 8 carbon atoms, more preferably between 4 and 5 carbon atoms, and are bonded to the phosphate moiety via a primary carbon. It is still further preferred that the alkyl substituents of the trialkyl phosphate, the dialkyl aryl phosphate, and the alkyl diaryl phosphate are isoalkyl groups. The fluid composition further comprises an acid scavenger, an anti-erosion additive, a viscosity index improver, and an antioxidant. A novel additive combination comprises a high molecular weight butyl/hexyl methacrylate viscos ity index improver, a perfluoroalkylsulfonate anti-erosion additive, a 3,4-epoxycyclohexanecarboxylate or a diepoxide acid scavenger, a di(alkylphenyl)amine, and a phenolic antioxidant comprising a mixture of a 2,4,6-trialkylphenol and a hindered polyphenol compound selected from the group consisting of bis(3,5-dialkyl-4-hydroxyaryl)methane, 1,3,5-trialkyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxyaryl)benzene and mixtures thereof. Preferably, the fluid composition further comprises a benzotriazole derivative as a copper corrosion inhibitor, and a 4,5-dihydroimidazole derivative, as an iron cor rosion inhibitor and to enhance the stability of the fluid.
Abstract:
A synthetic ester composition which exhibits thermal and oxidative stability, lower friction coefficient and lower wear, wherein the ester composition comprises the reaction product of: a branched or linear alcohol having the general formula R(OH) m , wherein R is an aliphatic or cyclo-aliphatic group having from about 2 to 20 carbon atoms and n is at least 2; and at least one branched mono-carboxylic acid which has a carbon number in the range between about C 5 to C 13 ; wherein the synthetic ester composition has between about 5-35% unconverted hydroxyl groups, based on the total amount of hydroxyl groups in the branched or linear alcohol.
Abstract:
Durch den Zusatz einer kleinen Menge von Carbodiimiden können Estergruppen enthaltende Schmierstoff-Grundsubstanzen stabilisiert und die Nutzungsdauer damit hergestellter Schmierstoffe entscheidend verlängert werden.