High temperature lubricant composition

Details High temperature lubricant composition High temperature lubricant composition

C - Chemistry, Metallurgy

10

M

C10M 169/04 (2006.01) C10M 105/38 (2006.01) C10M 129/14 (2006.01) C10M 133/12 (2006.01) C10M 133/44 (2006.01) C10M 135/18 (2006.01) C10M 137/10 (2006.01) C10M 145/14 (2006.01)

Patent

CA 2449778

Synthetic lubricants based on a 100% polyol ester composition suitable for use in high temperature static chain oil applications are provided. The lubricant includes a base stock based on a polyol ester that is the reaction product of a neopentyl polyol including a major proportion of dipentaerythritol and a mixture of C5 to C12 carboxylic acids. The preferred carboxylic acid mixture includes heptanic (C7) acid, caprylic/capric (C8-10) acid and isononanoic (3, 5,5- trimethylhexanoic) acid (iso-C9). The polyol base stock is mixed with an additive package that includes a viscosity index improver (tackifier), antioxidants, extreme pressure/antiwear agents and a corrosion inhibitor. The additive package may be added in up to about 20 percent by weight of the lubricant to provide a viscosity of the lubricant at 40 °C of 270-330 cSt and at 100 °C of no less than about 25.0 cSt

L'invention concerne des lubrifiants synthétiques améliorés basés sur une composition de polyol ester 100 % qui convient pour des huiles à chaîne à température élevée. Ce lubrifiant contient une charge de base à base de polyol ester, qui est le produit de réaction d'un néopentyle polyol comprenant une proportion importante de dipentaerythritol et un mélange d'acides carboxyliques C¿5?-C¿12?. Le mélange préféré d'acide carboxylique contient de l'acide heptanique (C¿7?), de l'acide caprylique/caprique (C¿8-10?) et de l'acide isononanoïque (3, 5, 5-triméthylhexanoïque) (iso-C¿9?). La charge de base à base de polyol est mélangée à un ensemble d'additifs qui présente un agent améliorant l'indice de viscosité (agent poisseux), des antioxydants, des agents extrême-pression/antiusure et un inhibiteur de corrosion. L'ensemble d'additifs peut être ajouté jusqu'à concurrence de 20 % en poids du lubrifiant afin d'assurer la viscosité du lubrifiant à 40 ·C de 270-330 cSt et à 100 ·C d'une quantité qui n'est pas inférieure à environ 25,0 cSt.

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