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All paraffinic, low temperature hydraulic oils

a technology of hydraulic oil and paraffinic oil, applied in the petroleum industry, lubricant compositions, etc., can solve the problems of high cost of naphthenic basestocks, inability to meet all viscometric properties, and difficulty in many of these standard hydraulic fluids

Inactive Publication Date: 2004-12-02
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a multi-grade hydraulic oil composition that has improved properties compared to traditional hydraulic oils. The composition includes a first paraffinic oil with specific viscosity and viscosity index requirements, a second paraffinic oil with specific viscosity and viscosity index requirements, and a polymethacrylate viscosity index improver with a specific shear stability index. The composition has low temperature properties that meet the requirements of a naphthenic oil containing hydraulic fluid. The composition also contains a small amount of conventional additives typically used in hydraulic oils. The technical effect of this invention is to provide a hydraulic oil composition with improved properties that can better meet the requirements of high-performance hydraulic systems.

Problems solved by technology

Many of these standard hydraulic fluids have difficulty, however, in meeting all of the viscometric properties required for the advanced designs of equipment now being developed and put into use.
One disadvantage in using naphthenic basestocks is cost.
Naphthenic basestocks are relatively more expensive than similar viscosity paraffinic basestocks.
Another disadvantage is availability.
As with naphthenic basestocks, severely hydrotreated basestocks are more expensive than similar viscosity paraffinic basestocks for substantially the same reasons.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The invention will be illustrated by the following examples which include preferred embodiments thereof. For the examples the following components were used to prepare hydraulic fluids of the specified ISO viscosity grade:

[0019] I A Group I paraffinic oil having a viscosity of about 2.6 cSt at 100.degree. C. and a VI of 85.

[0020] II A Group I paraffinic oil having a viscosity of about 4 cSt at 100.degree. C. and a VI of 95.

[0021] III A Group I paraffinic oil having a viscosity of about 5.4 cSt at 100.degree. C. and a VI of 95.

[0022] IV A Group I paraffinic oil having a viscosity of about 7 and a VI of 95.

[0023] V A Group I paraffinic oil having a viscosity of about 14 cSt at 100.degree. C. and a VI of 90.

[0024] VI A poly methacrylate VII having a shear stability index of about 14 and sold by RohMax under the trade name Viscoplex 8-219.

[0025] VII A commercial additive package containing a pour point depressant and components such as an antiwear additive, corrosion inhibitor, a...

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Abstract

A paraffinic hydraulic oil having a shear stability index of from 0 to 20, a shear loss of less than 7% as measured by ASTM D5621 and a Brookfield viscosity the same or better than a naphthenic oil of the same viscosity grade is provided. The hydraulic oil includes 5 wt % to 90 wt % of a first paraffinic oil having a KV at 100° C. of 2 to 6 cSt, 5 wt % to 90 wt % of a second paraffinic oil having a KV at 100° C. of 3 to 14 cSt and 5 wt % to 10 wt % of a polymethacrylate viscosity index improver.

Description

[0001] This application claims the benefit of U.S. Provisional application 60 / 458,639 filed Mar. 28, 2003.[0002] The present invention relates to hydraulic oils. More particularly the present invention relates to low temperature, multi grade, hydraulic oils.[0003] Hydraulic fluids are used in a wide variety of applications. For example, hydraulic fluids are used in vehicle transmissions, differentials, brakes and the like and in non-vehicular equipment and machinery used for example in injection molding and general manufacturing.[0004] Hydraulic fluids are commercially available in different viscosity grades in order to meet equipment manufacture requirements. Many of these standard hydraulic fluids have difficulty, however, in meeting all of the viscometric properties required for the advanced designs of equipment now being developed and put into use. For example, in order to formulate low temperature, multi-grade hydraulic oils it has been necessary to use naphthenic base stocks o...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M169/04
CPCC10M169/041C10M2203/1025C10M2209/084C10N2220/022C10N2230/02C10N2230/68C10N2240/08C10N2020/02C10N2030/02C10N2030/68C10N2040/08
Inventor LAWRENCE, KYLE D.SEMMEL, LISA A.
Owner EXXON RES & ENG CO