Aditivo para aceite de engranajes

• Main Authors: BOYDE, Stephen, LEFEVRE, Josephine Anne, RANDLES, Stephen
• Format: Patent
• Language: Spanish
• Published: 08.07.2019
• Subjects: CHEMISTRY; FUELS; INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATINGCOMPOSITIONS; LUBRICANTS; LUBRICATING COMPOSITIONS; METALLURGY; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION

Una formulación de aceite para engranajes que comprende un aceite para engranajes y un éster polimérico que es el producto de reacción de (a) al menos un neopentil poliol; (b) un ácido graso dímero escogido entre dímeros de ácidos grasos que tienen de 10 a 30 átomos de carbono, que es un ácido dímero hidrogenado con un índice de yodo menor de 25; (c) un ácido dicarboxílico alifático que tiene de 5 a 18 átomos de carbono; y (d) uno o más ingredientes para reducir el índice de acidez del éster polimérico por debajo de 5 mg KOH/g escogido entre ésteres glicidílicos; con el éster polimérico resultante que tiene una viscosidad cinemática a 100 ºC entre 400 y 5000 mm2/s y un peso molecular promedio en peso de 5000 a 20000, y un índice de no polaridad entre 1000 y 4000. Gear oil formulations comprising a gear oil and a film forming agent are disclosed. The film forming agent comprises a polymeric ester which is the reaction product of at least one polyfunctional alcohol, a dimer fatty acid, an optional aliphatic dicarboxylic acid having 5 to 18 carbon atoms and one or more ingredients to reduce the acid value of the polymeric ester to below 5 mgKOH/g with the resultant polymeric ester having a kinematic viscosity at 100° C. ranging from 400 to 5000 mm2/s and a weight average molecular weight ranging from 5000 to 20000. When used as an automotive gear oil formulation the specifications for API GL-4 gear oils are at least satisfied. Use of the gear oil formulation in manual transmissions, transfer cases and differentials and use of the gear oil formulation in an industrial gear suitable for lubricating spur, helical, bevel, worm and hypoid gears are disclosed. Methods of lubrication are also disclosed.