Lubricant composition

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 139/04 (2006.01) C10M 129/16 (2006.01) C10M 129/86 (2006.01) C10M 133/04 (2006.01) C10M 133/54 (2006.01) C10M 169/04 (2006.01)

Patent

CA 2192491

The lubricant composition of the present invention is characterized in that 1 ppm to 500 ppm of polysiloxane with a viscosity of 1,000 mm2/s to 100,000 mm2/s at 40 ~C and 1 ppm to 5,000 ppm of ethylene glycol-propylene glycol polymer or a derivative thereof are blended with a base oil with a viscosity of 10 mm2/s to 700 mm2/s at 40 ~C. Because the lubricant composition of the present invention has excellent anti-foaming property, particularly in lubricants of high viscosity and at higher temperature, the composition is useful as a lubricant composition for use as bearing oil such as a lubricant for paper machine, hydraulic oil for injection molding press, and a lubricant for film orientation machine.

La composition de lubrifiant de la présente invention est caractérisée en ce que 1 ppm à 500 ppm de polysiloxane présentant une viscosité comprise entre 1.000 mm?2¿/s et 100.000 mm?2¿/s à 40 ~C et 1 ppm à 5.000 ppm de polymère d'éthylène glycol-propylène glycol (ou l'un de ses dérivé) sont mélangés à une huile de base présentant une viscosité de 10 mm?2¿/s à 700 mm?2¿/s à 40 ~C. Etant donné les excellentes propriétés anti-moussantes de la composition de lubrifiant de la présente invention, notamment dans les lubrifiants de viscosité élevée à température élevée, la composition trouve son utilité dans les compositions de lubrifiants telles que l'huile à palier pour machines à papier, l'huile hydraulique pour presses de moulage par injection, et le lubrifiant pour machines à film orienté.

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