Hydraulic Fluid Compositions and Preparation Thereof

a technology of hydraulic fluid and composition, applied in the direction of additives, petroleum industry, lubricant compositions, etc., can solve the problems of less ventilation, reduced hydraulic fluid reservoir capacity, and accelerate oxidation and thermal degradation of hydraulic fluid, so as to reduce the oxidative degradation of hydraulic fluid

Inactive Publication Date: 2007-12-20
CHEVROU USA INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] In another aspect, there is provided a method to minimize oxidative degradation of hydraulic fluids for use in construction machinery, the method comprising using a hydraulic fluid composition comprising a lubricating base oil having consecutive numbers of carbon atoms, less than 10 wt % naphthenic carbon by n-d-M, less than 0.10 wt. % olefins and less than 0.05 wt. % aromatics; (ii) 0.001-20 wt % of at least an additive package; wherein the hydraulic fluid composition meets at least one of JACMAS HK and JCMAS HKB specification standards.

Problems solved by technology

The reduced capacity of the reservoir tank for hydraulic fluid and less ventilation at the engine / pump room for noise protection accelerates oxidation and thermal degradation of hydraulic fluids.

Method used

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  • Hydraulic Fluid Compositions and Preparation Thereof

Examples

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examples

[0099] The Examples were prepared by mixing the components in the amounts indicated Table 1. The formulae were subject to the piston pump test according to JCMAS HK standard specifications developed by the Fuels and Lubricants Technical Committee of Japan Construction Mechanization Association (JCMA).

[0100] FTBO base oils are from Chevron Corporation of San Ramon, Calif. The properties of the FTBO base oils used in the examples are shown in Table 4.

[0101] Nexbase™ 3060 is a colorless, catalytically hydroisomerized and dewaxed Group III base oil from Neste Oil Corporation.

[0102] Pennzoil™ HC 575 is a Group II mineral oil from Pennzoil-Quaker State Company.

[0103] Additive 1 is a commercially available rust and oxidation package.

[0104] Additive 2 is a triaryl phosphate ashless antiwear and extreme pressure additive.

[0105] Additive 3 is an amine phosphate an ashless multifunctional additive with extreme pressure / antiwear and antirust activity, typically containing 4.9% phosphorus ...

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Abstract

A hydraulic fluid composition having excellent oxidation stability prepared from an isomerized base oil is provided. The composition comprising (i) 80 to 99.999 wt. % of a lubricating base oil having consecutive numbers of carbon atoms, less than 10 wt % naphthenic carbon by n-d-M; and (ii) 0.001-20 wt % of at least an additive package. The hydraulic fluid composition meets the performance specifications of at least one of the JCMAS HK and JCMAS HKB standard specifications issued by the Fuels and Lubricants Technical Committee of Japan Construction Mechanization Association (JCMA).

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation-in-part of U.S. patent application Ser. No. 11 / 078,746, filed Mar. 11, 2005; U.S. patent application Ser. No. 11 / 131,611 filed Dec. 21, 2005; and U.S. patent application Ser. No. 11 / 316,310 filed Dec. 21, 2005. This application claims priority to and benefits from the foregoing, the disclosure of which is incorporated herein by reference.TECHNICAL FIELD [0002] The invention relates generally to hydraulic fluid compositions, and more specifically to hydraulic fluid compositions having excellent oxidation stability. BACKGROUND [0003] Hydraulic fluids serve as the power transmission medium in a hydraulic system. They are designed to transmit force and motion in industrial, mobile and non-mobile hydraulic systems such as automobiles, tractors, earthmovers, construction machinery, and hydraulic pumps, etc. In one particular application in recent years, e.g., hydraulic systems in construction machinery, high...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M145/14
CPCC10M169/04C10M2205/173C10N2220/021C10N2220/022C10N2240/08C10N2220/13C10N2230/02C10N2230/10C10N2230/74C10N2220/10C10N2020/04C10N2020/085C10N2020/081C10N2020/02C10N2030/02C10N2030/10C10N2030/74C10N2040/08
Inventor OPSTAL, TOMROSENBAUM, JOHN M.
Owner CHEVROU USA INC
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