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Natural and synthetic ester-containing lubricants having enhanced hydrolytic stability

A technology for natural esters and synthetic esters, applied in lubricating compositions, additives, petroleum industry, etc., can solve problems such as hydrolysis stability of ester-based lubricants that are not satisfactorily solved

Active Publication Date: 2014-02-26
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Neither approach satisfactorily addresses the hydrolytic stability of ester-based lubricants

Method used

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  • Natural and synthetic ester-containing lubricants having enhanced hydrolytic stability
  • Natural and synthetic ester-containing lubricants having enhanced hydrolytic stability
  • Natural and synthetic ester-containing lubricants having enhanced hydrolytic stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] The following examples illustrate the invention but are not intended to limit the scope of the invention. The present examples demonstrate that the inclusion of specific PAG block copolymer structures in the ester composition significantly improves the hydrolytic stability of the resulting lubricant composition.

[0037] Table 1 lists the components used to prepare the inventive and comparative lubricant compositions.

[0038] Table 1

[0039]

[0040]

[0041] *The term "X / Y w / w PO / EO" refers to a copolymer having X wt% of units derived from PO and Y wt% of units derived from EO.

[0042] Diols are initiators with 2 hydroxyl groups per molecule.

[0043] Triols are initiators with 3 hydroxyl groups per molecule.

[0044] Table 2 provides the compositions of Inventive Examples 1-5 and Comparative Examples 1-25.

[0045] Table 2

[0046]

[0047]

[0048] Each of the inventive and comparative examples was produced by blending the components at room tempe...

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PUM

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Abstract

A lubricant composition comprising (a) from 0.1 to 10 percent by weight of one or more polyalkylene glycols (PAG); and (2) one or more ester base oils selected from the group of natural esters, synthetic esters and combinations thereof; wherein the one or more PAG has a molecular weight in the range 1500 to 5000 g / mole, comprises from 10 to 40 percent by weight of units derived from ethylene oxide and from 90 to 60 percent by weight of units derived from propylene oxide; and wherein the one or more PAGs are in the form of block copolymer, reverse block copolymer or combinations thereof is provided. Also provided is a method of enhancing the hydrolytic stability of an ester base oil.

Description

technical field [0001] The present invention relates to ester-based lubricant compositions exhibiting improved hydrolytic stability and to methods of increasing the hydrolytic stability of ester-based lubricants. Background technique [0002] Synthetic and natural ester-based lubricants are used in many applications including, for example, automotive and aviation oils, refrigeration oils, metalworking fluids, gear oils, turbine oils, hydraulic fluids, and refrigeration lubricants. [0003] However, synthetic and natural ester-based lubricants are known to be sensitive to the influence of water. Hydrolysis of such lubricants can significantly reduce lubricant life and cause a higher risk of equipment failure. Furthermore, it is known in the art that the inclusion of antiwear additives in ester base oils, due to their acidic nature, can accelerate the hydrolytic degradation of the esters. Thus, at least one commonly used additive exacerbates the hydrolytic instability of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M145/26C10M169/04
CPCC10M2207/401C10N2240/08C10M145/26C10M2223/043C10M2209/104C10M2209/103C10M2207/301C10N2230/66C10M169/041C10M2209/10C10M2207/2835C10M2219/044C10N2030/66C10N2040/08C10M2209/105C10M129/08
Inventor N·科赫利迪杰M·R·格瑞维斯E·A·佐格-胡泽曼斯
Owner DOW GLOBAL TECH LLC
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