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Method of improving the acrylic rubber sealant compatibility in an internal combustion engine

a technology of acrylic rubber and internal combustion engine, which is applied in the direction of separation process, liquid degasification, foam dispersion/prevention, etc., can solve the problems of resin or rubber sealant deterioration, shrinkage of sealant, and inability to meet the requirements of internal combustion engine performance, etc., to achieve the effect of improving the compatibility of acrylic rubber sealan

Inactive Publication Date: 2007-08-09
CHEVRON JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0029] Among other aspects, it has been discovered that a lubricating oil composition containing a certain combination of a nitrogen-containing dispersant and a metal-containing detergent of an alkali metal salt of alkylphenol derivative having a Mannich base structure, together with a phosphorus-containing organic compound, can be effectively employed in a method for improving the acrylic rubber sealant compatibility in an internal combustion engine, if the ratio of the nitrogen-containing dispersant and a metal-containing detergent of an alkali metal salt of alkylphenol derivative having a Mannich base structure is adjusted to a specific range, i.e., in the range of from 1:0.005 to 1:2 in terms of the nitrogen content. The lubricating oil composition hardly impairs the sealing performance of the acrylic rubber sealant.

Problems solved by technology

However, lubricating oil compositions containing various additives often deteriorate resin or rubber sealants despite satisfying lubricating performance requirements.
Most of the additives contained in the compositions are so chemically active that they are liable to shrink the sealants and / or to impair their strength and elasticity.

Method used

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  • Method of improving the acrylic rubber sealant compatibility in an internal combustion engine
  • Method of improving the acrylic rubber sealant compatibility in an internal combustion engine
  • Method of improving the acrylic rubber sealant compatibility in an internal combustion engine

Examples

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Effect test

example 1

[0091] The below-mentioned additives and the base oil of lubricating viscosity were mixed to give: the lubricating oil composition employed in the method of the present invention. The lubricating oil composition was SAE viscosity grade 10W30. Also shown below are the contents of each element (Ca, P, N) in the lubricating oil composition, the ratio between the nitrogen content attributable to all the dispersants and that attributable to the detergent A (Mannich base calcium phenate), and the ratio between the metal content attributable to all the detergents and that attributable to the detergent A (Mannich base calcium phenate). [0092] (1) Additives [0093] Dispersant A (amount: 3.0 wt. %, content in terms of nitrogen: 0.03 wt. %), [0094] Dispersant B (amount. 1.5 wt. %, content in terms of nitrogen: 0.03 wt. %), [0095] Detergent A (amount: 0.4 wt. %, content in terms of calcium: 0.01 wt. %, content in terms of nitrogen; 0.006 wt. %), [0096] Detergent B (amount: 0.86 wt. %, content in...

example 2

[0111] The procedures of Example 1 were repeated except for changing the amount of the detergent A (Mannich base calcium phenate) into 1.16 wt. % (content in terms of calcium: 0.03wt. %, content in terms of nitrogen: 0.018 wt. %) and for changing the residual amount of the base oil of lubricating viscosity so that the total amount of the lubricating oil composition is 100 wt. %. The prepared lubricating oil composition was SAE viscosity grade 10W30. Shown below are the contents of each element (Can P, N) in the lubricating oil composition, a ratio between the nitrogen content attributable to all the dispersants and that attributable to the detergent A (Mannich base calcium phenate), and a ratio between the metal content attributable to all the detergents and that attributable to the detergent A (Mannich base calcium phenate). [0112] (1) Contents of each element (Ca, P, N) in the lubricating oil composition [0113] Calcium (Ca): 0.26 wt. %, Phosphorus (P); 0.10 wt. %, Nitrogen (N): 0....

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Abstract

It has been discovered that a lubricating oil composition containing a certain combination of a nitrogen-containing dispersant and a metal-containing detergent of an alkali metal salt of alkylphenol derivative having a Mannich base structure, together with a phosphorus-containing organic compound, can be effectively employed in a method for improving the acrylic rubber sealant compatibility in an internal combustion engine, if the ratio of the nitrogen-containing dispersant and a metal-containing detergent of an alkali metal salt of alkylphenol derivative having a Mannich base structure is adjusted to a specific range, i.e., in the range of from 1:0.005 to 1:2 in terms of the nitrogen contents.

Description

[0001] The present invention relates to a method of improving the acrylic rubber sealant compatibility in an internal combustion engine. More specifically, the present invention relates to a method comprising contacting acrylic rubber sealants in an internal combustion engine and operating the internal combustion engine with a lubricating oil composition having improved acrylic rubber sealant compatibility. BACKGROUND OF THE INVENTION [0002] In mechanical devices such as internal-combustion engine vehicles and various other industrial machines, it is necessary to supply a lubricating oil to mechanisms involving rubbing movement. Lubrication systems for supplying a lubricating oil are generally equipped with various sealing materials (sealants). Examples of the sealing materials include resin or rubber sealants such as silicone rubber sealant, acrylic rubber sealant, fluorocarbon resin sealant, nitrile rubber sealant, hydrogenated nitrile rubber sealant and ethylene-propylene rubber ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M169/04
CPCC10M163/00C10N2240/10C10M2205/024C10M2207/028C10M2209/084C10M2215/062C10M2215/064C10M2215/28C10M2217/043C10M2219/02C10M2219/046C10M2223/045C10M2227/06C10N2210/06C10N2230/36C10M2201/087C10N2010/12C10N2040/25C10N2030/36
Inventor TAKEUCHI, YOSHITAKAYAMASHITA, YOSHITONAKAZATO, MORIKUNI
Owner CHEVRON JAPAN
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