Functional fluid compositions with improved seal swell properties

A technology of functional fluids and compositions, applied in lubricating compositions, base materials, additives, etc., which can solve problems such as product waiver, excessive swelling and complication of synthetic rubber

Active Publication Date: 2012-05-16
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, naphthenic base oils have the potential to cause excessive swelling of elastomers and, in some cases, cause hydraulic fluids to fail specification tests, resulting in product disclaimers or useless products
This issue is compounded by the global supply constraints and general lack of availability of naphthenic base oils

Method used

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  • Functional fluid compositions with improved seal swell properties
  • Functional fluid compositions with improved seal swell properties
  • Functional fluid compositions with improved seal swell properties

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation of naphthenic base oils can be found in "Lubricants and Lubrication (Second Completely Revised and Extended Edition)", Chapter 4, pp. 46-48, published by Wiley-VCH Verlag GmbH & Co. KgaA.

[0020] Commercially available sources of naphthenic base oils include those commercially available from Calumet Lubricants Co. under the tradename HYDROCAL, those commercially available under the tradenames HYPRENE and HYGOLD from Ergon Petroleum Specialties, those commercially available from Nynas Alkanic base oils, and SNH series naphthenic base oils commercially available from Sankyo-Yuku.

[0021] Particularly preferred naphthenic base oils for use herein have a kinematic viscosity of 4.75-5.10 at 20°C, a kinematic viscosity of 2.90-3.20 at 40°C, a minimum flash point (ASTM D92) of 101°C, and a minimum pour point of -66°C.

[0022] Another major component of the base oil compositions herein are Fischer-Tropsch derived base oils.

[0023] The term "Fischer-Tropsc...

Embodiment 1-3

[0094] Examples 1-3 were prepared by mixing a naphthenic base oil with a Fischer-Tropsch derived base oil in the amounts shown in Table 6 below. The naphthenic base oil used in Examples 1-3 is the same as that used in Comparative Example 1.

[0095] The Fischer-Tropsch derived base oil used in Examples 1 and 2 had a viscosity of 2.68mm at 100°C 2 / s "GTL 3". The Fischer-Tropsch derived base oil used in Example 3 was "GTL-GO", i.e. a viscosity of 1.255 mm at 100°C 2 / s Fischer-Tropsch derived gas oil. GTL 3 and GTL-GO can be prepared as described in WO2004 / 07647. The performance of GTL3 and GTL-GO is shown in Table 5 below.

[0096] table 5

[0097] performance

testing method

unit

GTL 3

GTL-GO

Vk at 100°C

D445

mm 2 / s

2.68

1.255

Vk at 40°C

D445

mm 2 / s

9.581

3.128

Density at -40°C

D2983

CP

-

50 / 40

VI

D2270

119

-

pour point ...

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Abstract

A functional fluid composition comprising: (a) from 70% to 99.99%, by weight of the fluid composition, of a base oil composition comprising: (i) from 50% to 95%, by weight of the base oil composition, of a naphthenic base oil; and (ii) from 5% to 50%, by weight of the base oil composition, of a Fischer-Tropsch derived base oil. The functional fluid compositions according to the present invention are suitable for use in hydraulic fluids and shock absorber fluids and are useful for reducing the volume swell of synthetic rubbers.

Description

technical field [0001] The present invention relates to a functional fluid composition, in particular to a functional fluid composition for use as a hydraulic fluid and a shock absorber fluid and having improved seal swell properties. Background technique [0002] Mineral-based aviation hydraulic fluids typically use mineral naphthenic base oils to meet the low temperature performance required by the military specifications for these products, namely MIL-PRF-5606 and MIL-PRF-6083. These two specifications indicate that approved products must meet the requirements regarding the swelling of synthetic rubber. Specifically, the requirement is that when the hydraulic fluid is subjected to test method FED-STD-791D-3605.5, the volume swell of the elastomer is 19-30% for MIL-PRF-5606 and 19-30% for MIL-PRF-6083. 28%. Unfortunately, naphthenic base oils have the potential to cause excessive swelling of elastomers and in some cases cause hydraulic fluids to fail specification tests,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M111/02C10M143/00C10N40/08C10N40/34
CPCC10M2223/041C10M2205/17C10M2205/173C10M111/02C10N2230/12C10M2203/045C10N2230/74C10N2230/36C10M2209/084C10M2215/223C10M2207/026C10N2230/02C10M2203/1065C10N2240/08C10N2230/06C10N2230/08C10M143/00C10N2030/02C10N2030/06C10N2030/08C10N2030/12C10N2040/08C10N2030/36C10N2030/74
Inventor C·S·特里德盖特
Owner SHELL INT RES MAATSCHAPPIJ BV
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