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Electrically insulating oil composition having excellent performance in wide temperature range

A technology of electrical insulating oil and composition, applied in the directions of organic insulators, organic liquid insulators, circuits, etc., can solve the problems of inability to use alone, low viscosity, high bioaccumulation properties of dibenzyltoluene, etc.

Inactive Publication Date: 2014-10-01
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The third reason is that dibenzyltoluene has high bioaccumulation properties
Although 1,1-diphenylethane has a low freezing point, it cannot be used alone in the temperature range below -50°C
[0013] Although benzyltoluene has high hydrogen absorption and low viscosity, it is not satisfactory for use at -50°C because, as mentioned above, the melting points of the o-isomer, m-isomer, and p-isomer are +6.6°C, -27.8°C and +4.6°C

Method used

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  • Electrically insulating oil composition having excellent performance in wide temperature range

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The mixed oil may contain 60% by mass of 1,1-diphenylethane, 5% by mass of 1-phenyl-1-(3-methylphenyl)ethane and 35% by mass of 1-phenyl-1 -(4-methylphenyl)ethane to prepare and carry out the following experimental examples A and B. The results are shown in Table 1. The 1-phenyl-1-methylphenylethane used in this example was composed of 1% by mass of the o-isomer, 11% by mass of the m-isomer and 88% by mass of the p-isomer A mixture of isomers, the 1-phenyl-1-methylphenylethane is produced by following the steps of Example 1 of Japanese Patent Application Laid-Open No. 2003-119159, wherein the raw material cumene is replaced by toluene, and the reaction temperature Change to 200°C, followed by distillation.

Embodiment 2

[0055] The mixed oil may contain 60% by mass of 1,1-diphenylethane, 21% by mass of 1-phenyl-1-(3-methylphenyl)ethane and 19% by mass of 1-phenyl-1 -(4-methylphenyl)ethane to prepare and carry out the following experimental examples A and B. The results are shown in Table 1. The 1-phenyl-1-methylphenylethane used in this example was composed of 1% by mass of the o-isomer, 52% by mass of the m-isomer and 47% by mass of the p-isomer A mixture of isomers, the 1-phenyl-1-methylphenylethane is produced by following the steps of Example 1 of Japanese Patent Application Laid-Open No. 2003-119159, wherein the raw material cumene is replaced by toluene, and the reaction temperature Change to 260°C, followed by distillation.

Embodiment 3

[0057] The mixed oil may contain 50% by mass of 1,1-diphenylethane, 1% by mass of 1-phenyl-1-(2-methylphenyl)ethane, 24% by mass of 1-phenyl-1 -(3-methylphenyl)ethane and 25% by mass of 1-phenyl-1-(4-methylphenyl)ethane to prepare and carry out the following experimental examples A and B. The results are shown in Table 1. The 1-phenyl-1-methylphenylethane used in this example was a mixture of those used in Examples 1 and 2.

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Abstract

Provided is an electrically insulating oil composition comprising C14 and C15 diarylalkanes, being an excellent electrically insulating oil composition that has both normal temperature and low temperature characteristics, maintains a high insulation breakdown voltage in a wide temperature range of -50-30 DEG C, and, in particular, has crystals that are extremely difficult to separate at -50 DEG C. The electrically insulating oil composition is characterized by: the C14 diarylalkane being 1,1-diphenylethane or a mixture of 1,1-diphenylethane and benzyltoluene; and the C15 diarylalkane being 1-phenyl-1-methylphenylethane.

Description

technical field [0001] The present invention relates to electrical insulating oil compositions comprising mixtures of diaryl alkanes and having excellent properties over a broad temperature range. Background technique [0002] Examples of properties mainly required to be possessed by electrical insulating oils include high breakdown voltage, high hydrogen absorption, low viscosity, and low melting point. In recent years, electrical insulating oils having high breakdown voltages are being used worldwide. Unlike the past few years, with the economic growth, electrical insulating oil has been required to have such excellent low-temperature characteristics that it can be used in extremely low temperature areas where this oil has never been used before, and it is required to have -50°C Under the condition that it does not cause solids to produce such performance. It is known that if solids are generated in electrical insulating oil during use, discharge may occur from the solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/22H01G4/22
CPCH01B3/22H01G4/221H01G4/18H01G4/32
Inventor 木村信启星野广行川口贵广
Owner JX NIPPON OIL & ENERGY CORP