JP2002265967A - Insulating oil in which x-ray tube is immersed, and x-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray tube device which can realize the designing of a smaller lightweight tube container while keeping the safety in the case of an excessive input into the X-ray tube device due to, e.g. an installation unit failure, and which can be used under a higher thermal load, and an insulating oil used for it. SOLUTION: The insulating oil, in which an X-ray tube is immersed, contains at least one compound selected from (A) an alkylbenzene, (B) a compound represented by general formula (1), (C) a compound represented by general formula (2), and (D) a compound represented by general formula (3).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an insulating oil for immersing an X-ray tube and an X-ray tube device.

[0002]

2. Description of the Related Art An X-ray tube apparatus is designed to operate the apparatus for a certain period of time and then to stop the apparatus for a certain period of time. However, there is a case where the apparatus operates for a certain period of time due to a failure of the apparatus, or the apparatus operates without a sufficient pause time (hereinafter, these states are referred to as excessive input). The X-ray tube apparatus has taken a number of safety measures to reduce the risk of breakage of the tube container even in that case. The first safety measure is to attach a thermo switch on the surface of the X-ray tube container and to cut off the input to the X-ray tube device when the tube container exceeds a predetermined temperature during excessive input to the X-ray tube device. It is. Alternatively, there is an example in which a pressure switch for sensing the pressure of insulating oil is provided in place of the thermoswitch, and similar measures are taken. Further, assuming a case where the first security measure does not function well, the following second security measure may be taken. If the first safety measure does not work well, the vacuum envelope of the X-ray tube can be destroyed by heat. In that case, the insulating oil flowing into the X-ray tube having a vacuum inside comes into contact with the high-temperature anode target. Conventionally used insulating oil for immersing X-ray tubes is based on refined mineral oil.
Since such insulating oil is partially decomposed and gasified at a high temperature, the internal pressure of the tube container may be increased to damage the tube container. In order to prevent this, there is an example in which a safety valve is provided which operates when the pressure inside the tube container becomes equal to or higher than a predetermined pressure and discharges the insulating oil. In designing a tube container, it is necessary to design a sufficient pressure resistance so that the tube container will not be damaged even if the input is excessively input due to a failure of the device mounting the X-ray tube device.

[0003]

However, the above-mentioned pressure-resistant design is a major obstacle in implementing an economical design for making the X-ray tube smaller and lighter, and furthermore making the mounting device smaller and lighter. I have. In addition, when the X-ray irradiation is frequently used repeatedly, the temperature of the anode target becomes higher. Therefore, when the input device is broken due to excessive input due to a failure of the mounting device, the pressure rise value inside the vessel becomes higher. Become. Therefore, it was not possible to use X-ray irradiation more frequently than before without changing the tube container. The present invention solves the above-mentioned conventional disadvantages.
Since the decomposition rate at high temperature is low and the degree of gasification is low, X
An object of the present invention is to provide an insulating oil suitable for immersing a wire tube. Further, the present invention enables a compact and lightweight design of a tube container while keeping the safety at the time of excessive input to the X-ray tube device due to a failure of the device mounting the X-ray tube device. The purpose is to provide. Still another object of the present invention is to provide an X-ray tube device that can be used with a higher heat load while keeping the safety of the X-ray tube device over-input due to a failure of the mounting device or the like.

[0004]

Means for Solving the Problems As a result of earnest studies, the present inventors have found that the above object can be achieved by using a specific insulating oil for immersing an X-ray tube.
That is, the present invention provides an X-ray tube immersion insulating oil containing at least one selected from the following (A) to (D). (A) Alkylbenzene (B) Compound represented by the following general formula (1)

Embedded image (In the general formula (1), R ¹ represents an alkylene group or alkenylene group having 1 to 8 carbon atoms, and R ² , R ³ , R ⁴ and R ⁵ may be the same or different, and are each independently hydrogen. Represents an atom or an alkyl group having 1 to 4 carbon atoms, and the total carbon number of R ¹ , R ² , R ³ , R ⁴ and R ⁵ is 1 to 8.) (C) In the following general formula (2) Represented compound

Embedded image (In the general formula ^{(2), R 6, R} 7, R 8 and R ⁹ may each be the same or different, each independently represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and R ⁶ , R ⁷ , R ⁸ and R ^{9 have} a total carbon number of 1 to 10.) (D) a compound represented by the following general formula (3)

Embedded image (In the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R ¹³
May be the same or different, each independently represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the total carbon number of R ¹⁰ , R ¹¹ , R ¹² and R ¹³ is 1 to 10 . )

According to the present invention, there is provided an X-ray tube apparatus comprising an X-ray tube, a tube container for accommodating the X-ray tube, and insulating oil sealed in the tube container, wherein the insulating oil comprises the following (A) to (D) The present invention provides an X-ray tube device containing at least one member selected from the group consisting of: (A) Alkylbenzene (B) Compound represented by the following general formula (1)

Embedded image (In the general formula (1), R ¹ represents an alkylene group or alkenylene group having 1 to 8 carbon atoms, and R ² , R ³ , R ⁴ and R ⁵ may be the same or different, and are each independently hydrogen. Represents an atom or an alkyl group having 1 to 4 carbon atoms, and the total carbon number of R ¹ , R ² , R ³ , R ⁴ and R ⁵ is 1 to 8.) (C) In the following general formula (2) Represented compound

Embedded image (In the general formula ^{(2), R 6, R} 7, R 8 and R ⁹ may each be the same or different, each independently represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and R ⁶ , R ⁷ , R ⁸ and R ^{9 have} a total carbon number of 1 to 10.) (D) a compound represented by the following general formula (3)

Embedded image (In the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R ¹³
May be the same or different, each independently represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the total carbon number of R ¹⁰ , R ¹¹ , R ¹² and R ¹³ is 1 to 10 . )

Further, the present invention provides an X-ray tube, a tube container for accommodating the X-ray tube, insulating oil sealed in the tube container, a pump communicating with the tube container and circulating the insulating oil, and a heat of the insulating oil. An X-ray tube apparatus comprising: an oil cooler unit having a heat exchanger for releasing heat to the outside; wherein the insulating oil contains at least one selected from the following (A) to (D): A tube device is provided. (A) Alkylbenzene (B) Compound represented by the following general formula (1)

Embedded image (In the general formula (1), R ¹ represents an alkylene group or alkenylene group having 1 to 8 carbon atoms, and R ² , R ³ , R ⁴ and R ⁵ may be the same or different, and are each independently hydrogen. Represents an atom or an alkyl group having 1 to 4 carbon atoms, and the total carbon number of R ¹ , R ² , R ³ , R ⁴ and R ⁵ is 1 to 8.) (C) In the following general formula (2) Represented compound

Embedded image (In the general formula ^{(2), R 6, R} 7, R 8 and R ⁹ may each be the same or different, each independently represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and R ⁶ , R ⁷ , R ⁸ and R ^{9 have} a total carbon number of 1 to 10.) (D) a compound represented by the following general formula (3)

Embedded image (In the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R ¹³
May be the same or different, each independently represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the total carbon number of R ¹⁰ , R ¹¹ , R ¹² and R ¹³ is 1 to 10 . )

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described specifically. FIG. 1 shows a CT as an example of the X-ray tube apparatus of the present invention.
1 shows an X-ray tube device for a scanner. The X-ray tube apparatus for a CT scanner includes an X-ray tube 11, a tube container 15 accommodating the X-ray tube 11, an insulating oil 14 sealed in the tube container 15,
An oil cooler 17 provided separately from the tube container 15,
A hose 16 is connected to the tube container 15 and the oil cooler 17 to circulate the insulating oil 14. X-ray tube 11
Has a cathode structure 12 disposed inside a vacuum envelope, and a rotating anode target 13 that emits X-rays. The oil cooler 17 includes a pump 18 for circulating insulating oil and a heat exchanger 19. The X-ray beam emitted from the anode target 13 passes through the X-ray emission window 20 of the X-ray tube and the X-ray transmission window 15a of the tube container 15 and is emitted to the outside as indicated by the arrow Y.

The insulating oil 14 contains at least one selected from the following (A) to (D). (A) Alkylbenzene (B) Compound represented by the following general formula (1)

Embedded image (In the general formula (1), R ¹ represents an alkylene group or alkenylene group having 1 to 8 carbon atoms, and R ² , R ³ , R ⁴ and R ⁵ may be the same or different, and are each independently hydrogen. Represents an atom or an alkyl group having 1 to 4 carbon atoms, and the total carbon number of R ¹ , R ² , R ³ , R ⁴ and R ⁵ is 1 to 8.) (C) In the following general formula (2) Represented compound

Embedded image (In the general formula ^{(2), R 6, R} 7, R 8 and R ⁹ may each be the same or different, each independently represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and R ⁶ , R ⁷ , R ⁸ and R ^{9 have} a total carbon number of 1 to 10.) (D) a compound represented by the following general formula (3)

Embedded image (In the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R ¹³
May be the same or different, each independently represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the total carbon number of R ¹⁰ , R ¹¹ , R ¹² and R ¹³ is 1 to 10 . )

The alkylbenzene (A) in the present invention is not particularly limited with respect to the number of carbon atoms of the alkyl group, but it has 1 to 4 alkyl groups having 1 to 40 carbon atoms, and the total number of carbon atoms of the alkyl group is 1 to 1. It is preferably a compound having from 1 to 40, more preferably having 1 to 4 alkyl groups having 1 to 30 carbon atoms, and having a total carbon number of 3 to 30 alkyl groups. As the alkyl group having 1 to 40 carbon atoms, specifically, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, a linear or branched butyl group, a linear or branched Pentyl group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched nonyl group, linear Or a branched decyl group, a linear or branched undecyl group, a linear or branched dodecyl group,
Linear or branched tridecyl group, linear or branched tetradecyl group, linear or branched pentadecyl group, linear or branched hexadecyl group, linear or branched Heptadecyl group, linear or branched octadecyl group, linear or branched nonadecyl group, linear or branched icosyl group, linear or branched henicosyl group, Linear or branched docosyl group, linear or branched tricosyl group, linear or branched tetracosyl group, linear or branched pentacosyl group, linear or branched Hexacosyl group, linear or branched heptacosyl group, linear or branched octacosyl group, linear or branched nonacosyl group, linear or branched triacontyl group, linear Or branched Hentako Tyl group, linear or branched dotriacontyl group, linear or branched tritriacontyl group, linear or branched tetratriacontyl group, linear or branched penta Triacontyl group, linear or branched hexatriacontyl group, linear or branched heptatriacontyl group, linear or branched octatriacontyl group, linear And a branched nonatriacyl group, a linear or branched tetracontyl group (including all isomers), and the like.
These alkyl groups may be linear or branched, but linear alkylbenzenes are preferred from the viewpoint of gasification at high temperatures. In addition, as alkylbenzene, not only a compound of a single structure,
It may be a mixture of two or more.

The method for producing the above-mentioned alkylbenzene is optional, and is not limited at all. In general, it can be produced by contacting an aromatic compound with an alkylating agent in the presence of a catalyst. As the aromatic compound as a raw material,
Specifically, for example, benzene, toluene, xylene, ethylbenzene, methylethylbenzene, diethylbenzene, a mixture thereof and the like are used. As the alkylating agent, specifically, for example, a linear or branched olefin having 6 to 40 carbon atoms obtained by polymerization of a lower monoolefin (preferably propylene) such as ethylene, propylene, butene, or isobutylene; Linear or branched olefins having 6 to 40 carbon atoms obtained by pyrolysis of wax, heavy oil, petroleum fraction, polyethylene, polypropylene, etc .; separating n-paraffins from petroleum fractions such as kerosene and gas oil And linear olefins having 9 to 40 carbon atoms obtained by olefination thereof with a catalyst; and mixtures thereof. Alkylation catalysts used in the alkylation include Friedel-Crafts type catalysts such as aluminum chloride and zinc chloride; acidic catalysts such as sulfuric acid, phosphoric acid, silicotungstic acid, hydrofluoric acid, and activated clay; A known catalyst is used.

The content of the above-mentioned (A) alkylbenzene alone when used alone is not particularly limited. However, from the viewpoint of the degree of gasification at a high temperature, the content is 5% by volume based on the total amount of insulating oil.
Is preferably at least 10% by volume, more preferably at least 20% by volume, even more preferably at least 30% by volume.
The content is more preferably 0% by volume or more, even more preferably 50% by volume or more, and most preferably 60% by volume or more.

In (A), the linear alkylbenzene has a lower gasification degree at a high temperature, and the content of the branched alkylbenzene when used alone is determined by the gasification at a high temperature. In order to reduce the degree to a lower level, it is desired that the concentration is 30% by volume or more.

In the compound (B) of the present invention represented by the general formula (1), R ¹ represents an alkylene group or alkenylene group having 1 to 8 carbon atoms. Among them, carbon number 1
Preferred are alkylene and alkenylene groups of 6 to 6,
Particularly preferred are carbons such as methylene, methylmethylene (ethylidene), ethylene, ethylmethylene (propylidene), dimethylmethylene (isopropylidene), methylethylene (propylene) and trimethylene. An alkylene group of the formulas 1 to 3; a vinylidene group, an ethenylene group (vinylene group), a propenylene group,
Alkenylene group having 2 to 3 carbon atoms such as methyleneethylene group, methylethenylene group, 1-propenylidene group and 2-propenylidene group; among alkylene groups having 4 to 6 carbon atoms,
1-methyl trimethylene group, 1-ethyl trimethylene group, 1,1-dimethyl trimethylene group, 1,2-dimethyl trimethylene group, 1,3-dimethyl trimethylene group,
1-ethyl-3-methyltrimethylene group, 1-ethyl-
2-methyltrimethylene group, 1,1,2-trimethyltrimethylene group, 1,1,3-trimethyltrimethylene group; and, among alkenylene groups having 4 to 6 carbon atoms, 3-
A methylpropenylene group, a 1-methyl-3-methylenetrimethylene group, a 3-ethylpropenylene group, a 1,3-dimethylpropenylene group, a 2,3-dimethylpropenylene group, a 3,3-dimethylpropenylene group, 1,1-dimethyl-3-methylene trimethylene group, 1-ethyl-3-methylene trimethylene group, 3-ethyl-1-methylpropenylene group, 3-ethyl-2-methylpropenylene group,
1,3,3-trimethylpropenylene group, 2,3,3-
A trimethylpropenylene group;

R ² , R ³ , R ⁴ and R ⁵ in the general formula (1) may be the same or different and each represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
Specific examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group, and a tert-butyl group. And the like. The total carbon number of R ¹ , R ² , R ³ , R ⁴ and R ⁵ of the compound represented by the general formula (1) is 1 to 8, preferably 1 to 6. Among the compounds represented by the general formula (1), R ¹ ,
R ² , R ³ , R ⁴ and R ^{5 have} a total carbon number of 1 to 6,
R ² , R ³ , R ⁴ and R ⁵ are each a hydrogen atom, a group selected from a methyl group, an ethyl group, an isopropyl group and a sec-butyl group, and at least two of them are hydrogen atoms. Are preferred. Most preferred are, R ¹ is an alkylene group or alkenylene group having 1 to 3 carbon atoms, the total number of carbon atoms in ^{R 1, R 2, R 3} , R 4 and R ⁵ are 1 to 6, R ² , R ³ , R ⁴ and R ⁵ are each a hydrogen atom, a methyl group, an ethyl group, an isopropyl group,
And at least two of them are hydrogen atoms, or R ¹ is an alkylene group or alkenylene group having 4 to 6 carbon atoms, and R ² , R ³ , R ⁴ and R ⁵ are all hydrogen atoms.

The most preferable compounds represented by the general formula (1) are, for example, diphenylmethane, phenyltolylmethane, phenylxylylmethane, ditolylmethane, (ethylphenyl) phenylmethane, (ethylphenyl) Tolylmethane, (ethylmethylphenyl) phenylmethane, (diethylphenyl) phenylmethane, bis (ethylphenyl) methane, phenyl (isopropylphenyl) methane, (isopropylphenyl) tolylmethane, (methylisopropylphenyl)
Methylene such as phenylmethane, (ethylisopropylphenyl) phenylmethane, (ethylphenyl) (isopropylphenyl) methane, (sec-butylphenyl) phenylmethane, (sec-butylmethylphenyl) phenylmethane, (sec-butylphenyl) tolylmethane Compounds having a group;

1,1-diphenylethane, 1-phenyl-1-tolylethane, 1-phenyl-1-xylylethane, 1,1-ditolylethane, 1- (ethylphenyl)
-1-phenylethane, 1- (ethylphenyl) -1-
Tolylethane, 1- (ethylmethylphenyl) -1-phenylethane, 1- (diethylphenyl) -1-phenylethane, 1,1-bis (ethylphenyl) ethane, 1
-Phenyl-1- (isopropylphenyl) ethane, 1
-(Isopropylphenyl) -1-tolylethane, 1-
Compounds having a methylmethylene group (ethylidene group) such as (methylisopropylphenyl) -1-phenylethane and 1- (sec-butylphenyl) -1-phenylethane;

1,2-diphenylethane, 1-phenyl-2-tolylethane, 1-phenyl-2-xylylethane, 1,2-ditolylethane, 1- (ethylphenyl)
-2-phenylethane, 1- (ethylphenyl) -2-
Tolylethane, 1- (ethylmethylphenyl) -2-phenylethane, 1- (diethylphenyl) -2-phenylethane, 1,2-bis (ethylphenyl) ethane, 1
-Phenyl-2- (isopropylphenyl) ethane, 1
-(Isopropylphenyl) -2-tolylethane, 1-
Compounds having an ethylene group such as (methylisopropylphenyl) -2-phenylethane and 1- (sec-butylphenyl) -2-phenylethane;

1,1-diphenylpropane, 1-phenyl-1-tolylpropane, 1-phenyl-1-xylylpropane, 1,1-ditolylpropane, 1- (ethylphenyl) -1-phenylpropane, 1 Compounds having an ethylmethylene group (propylidene group) such as-(ethylphenyl) -1-tolylpropane, 1- (ethylmethylphenyl) -1-phenylpropane, 1-phenyl-1- (isopropylphenyl) propane;

2,2-diphenylpropane, 2-phenyl-2-tolylpropane, 2-phenyl-2-xylylpropane, 2,2-ditolylpropane, 2- (ethylphenyl) -2-phenylpropane, Compounds having a dimethylmethylene group (isopropylidene group) such as-(ethylphenyl) -2-tolylpropane, 2- (ethylmethylphenyl) -2-phenylpropane, 2-phenyl-2- (isopropylphenyl) propane;

A compound having an alkenylene group having 4 carbon atoms, such as 1,3-diphenylbutane;

Compounds having an alkylene group having 5 carbon atoms, such as 1,3-diphenylpentane, 2,4-diphenylpentane, 2-methyl-1,3-diphenylbutane, and 3-methyl-1,3-diphenylbutane;

2,4-diphenylhexane, 2-methyl-1,3-diphenylpentane, 2-methyl-2,4-
Compounds having an alkylene group having 6 carbon atoms, such as diphenylpentane and 2,3-dimethyl-1,3-diphenylbutane;

1,1-diphenylethene, 1-phenyl-1-tolylethene, 1-phenyl-1-xylylethene, 1,1-ditolylethene, 1- (ethylphenyl)
-1-phenylethene, 1- (ethylphenyl) -1-
Tolylethene, 1- (ethylmethylphenyl) -1-phenylethene, 1- (diethylphenyl) -1-phenylethene, 1,1-bis (ethylphenyl) ethene, 1
-Phenyl-1- (isopropylphenyl) ethene, 1
-(Isopropylphenyl) -1-tolylethene, 1-
Compounds having a vinylidene group such as (methylisopropylphenyl) -1-phenylethene and 1- (sec-butylphenyl) -1-phenylethene;

1,2-diphenylethene, 1-phenyl-2-tolylethene, 1-phenyl-2-xylylethene, 1,2-ditolylethene, 1- (ethylphenyl)
-2-phenylethene, 1- (ethylphenyl) -2-
Tolylethene, 1- (ethylmethylphenyl) -2-phenylethene, 1- (diethylphenyl) -2-phenylethene, 1,2-bis (ethylphenyl) ethene, 1
-Phenyl-2- (isopropylphenyl) ethene, 1
-(Isopropylphenyl) -2-tolylethene, 1-
Compounds having an ethenylene group (vinylene group) such as (methylisopropylphenyl) -2-phenylethene and 1- (sec-butylphenyl) -2-phenylethene;

1,2-diphenylpropene, 1-phenyl-2-tolylpropene, 1-phenyl-2-xylylpropene, 1,2-ditolylpropene, 1- (ethylphenyl) -2-phenylpropene, 1 -(Ethylphenyl) -2-tolylpropene, 1- (ethylmethylphenyl) -2-phenylpropene, 1-phenyl-2- (isopropylphenyl) propene, 2-phenyl-1-tolylpropene, 2-phenyl-1 -Xylylpropene,
2- (ethylphenyl) -1-phenylpropene, 2-
Compounds having a methylethenylene group such as (ethylphenyl) -1-tolylpropene, 2- (ethylmethylphenyl) -1-phenylpropene, and 2-phenyl-1- (isopropylphenyl) propene;

1,3-diphenylpropene, 1-phenyl-3-tolylpropene, 1-phenyl-3-xylylpropene, 1,3-ditolylpropene, 1- (ethylphenyl) -3-phenylpropene, 1 -(Ethylphenyl) -3-tolylpropene, 1- (ethylmethylphenyl) -3-phenylpropene, 1-phenyl-3- (isopropylphenyl) propene, 3-phenyl-1-tolylpropene, 3-phenyl-1 -Xylylpropene,
3- (ethylphenyl) -1-phenylpropene, 3-
Compounds having a propenylene group such as (ethylphenyl) -1-tolylpropene, 3- (ethylmethylphenyl) -1-phenylpropene, and 3-phenyl-1- (isopropylphenyl) propene;

2,3-diphenylpropene, 2-phenyl-3-tolylpropene, 2-phenyl-3-xylylpropene, 2,3-ditolylpropene, 2- (ethylphenyl) -3-phenylpropene, 2 -(Ethylphenyl) -3-tolylpropene, 2- (ethylmethylphenyl) -3-phenylpropene, 2-phenyl-3- (isopropylphenyl) propene, 3-phenyl-2-tolylpropene, 3-phenyl-2 -Xylylpropene,
3- (ethylphenyl) -2-phenylpropene, 3-
Compounds having a methylene ethylene group such as (ethylphenyl) -2-tolylpropene, 3- (ethylmethylphenyl) -2-phenylpropene, and 3-phenyl-2- (isopropylphenyl) propene;

Compounds having an alkenylene group having 4 carbon atoms, such as 1,3-diphenylbutene;

Examples of 1,3-diphenylpentene, 2,4-diphenylpentene, 2,4-diphenyl-2-pentene, 2-methyl-1,3-diphenylbutene, 3-methyl-1,3-diphenylbutene and the like A compound having an alkenylene group having 5 carbon atoms;

2,4-diphenylhexene, 2,4-diphenyl-2-hexene, 2-methyl-1,3-diphenylpentene, 4-methyl-2,4-diphenylpentene, 4-methyl-2,4- Diphenyl-2-pentene,
Compounds having an alkenylene group having 6 carbon atoms, such as 2,3-dimethyl-1,3-diphenylbutene;

The method for producing the compound represented by the general formula (1) is arbitrary, and can be produced by various known methods. Some examples are shown below. The compound represented by the general formula (1) is obtained by adding styrenes such as styrene, α-methylstyrene, β-methylstyrene, and ethylstyrene to alkylbenzene in the presence of an acid catalyst. As the acid catalyst, mineral acids such as sulfuric acid and phosphoric acid, solid acid substances such as acid clay and activated clay, and Friedel-Crafts catalyst which is a metal halide can be used.

It is also produced by a polymerization reaction of the above styrenes in the presence of a suitable acid catalyst. At this time, a single styrene compound may be used, or two or more styrene compounds may be used for copolymerization. As the acid catalyst, mineral acids such as sulfuric acid and phosphoric acid, solid acid substances such as acid clay and activated clay, and Friedel-Crafts catalyst which is a metal halide can be used. Usually, the compound obtained by this method is a compound in which two benzene rings are linked by an alkenylene group. However, the compound may be used as it is in the present invention, and hydrogenation of the alkenylene group in the presence of a suitable catalyst is carried out. Alternatively, a compound obtained by converting an alkenylene group into an alkylene group may be used.

As for the alkylation of an aromatic compound, the Friedel-Crafts reaction of chloride is well known, but the compound represented by the general formula (1) can also be produced by this method. For example, it is obtained by reacting an alkylbenzene having a chlorinated side chain alkyl group with benzene or an alkylbenzene in the presence of a suitable Friedel-Crafts catalyst such as a metal halide. Another example is a method of coupling a dihalogenated alkane with benzene or alkylbenzene in the presence of a suitable Friedel-Crafts catalyst such as a metal halide.

The compound represented by the general formula (1)
It may be produced by the above method using an alkylbenzene having an alkyl group represented by R ^{1 to} R ⁴ , or may be added to the hydrocarbon compound produced by the above method or the like by various methods. It is manufactured even if it is made to do. The compound represented by the general formula (1) is not limited to a compound having a single structure, and may be a mixture of compounds having different structures as long as the compound satisfies the general formula (1).

The content of (B) the compound represented by the general formula (1) when used alone is not particularly limited. However, from the viewpoint of the degree of gasification at a high temperature, the content is based on the total amount of insulating oil. It is preferably at least 5% by volume, more preferably at least 10% by volume, even more preferably at least 20% by volume, further preferably at least 30% by volume, and at least 40% by volume. Is still more preferably 50% by volume or more, and still more preferably 60% by volume or more.

In the present invention, (C) represented by the general formula (2)
In the compound⁶, R⁷, R ⁸And R⁹Is the same for each
May be different from each other,
Represents a hydrocarbon group having a prime number of 1 to 10, preferably 1 to 8
I have. The hydrocarbon group referred to here includes an alkyl group,
Lucenyl group, aryl group, alkaryl group, aralkyl
And the like.

Preferred examples of the hydrocarbon group represented by R ⁶ , R ⁷ , R ⁸ and R ^{9 in the} general formula (2) include, for example, a methyl group, an ethyl group, an n-propyl group and an isopropyl group. , A linear or branched butyl group, a linear or branched pentyl group, a linear or branched hexyl group, a linear or branched heptyl group, a linear or branched octyl group An alkyl group having 1 to 8 carbon atoms such as ethenyl group (vinyl group), 1-propenyl group, 2-propenyl group (allyl group), 1-methylethenyl group (isopropenyl group), linear or branched butenyl Alkenyl having 2 to 8 carbon atoms such as a group, linear or branched pentenyl group, linear or branched hexenyl group, linear or branched heptenyl group, linear or branched octenyl group, etc. Group; An aryl or alkaryl group having 6 to 8 carbon atoms such as a nyl group, a tolyl group, a xylyl group, an ethylphenyl group, and a vinylphenyl group; a benzyl group, a 1-phenylethyl group, a 1-phenylethyl group (a phenethyl group), and the like; And an aralkyl group having 7 to 8 carbon atoms; Further, among these, an alkyl group having 1 to 8 carbon atoms and an alkenyl group having 2 to 8 carbon atoms are particularly preferable, and among them, branched ones are preferable.

The total number of carbon atoms of R ⁶ , R ⁷ , R ⁸ and R ^{9 in} the general formula (2) is from 1 to 10, preferably from 1 to 8. Within this range, R ⁶ , R ⁷ , R ⁸ and R ⁹ may be the same or different. That is, as the compound represented by the general formula (2), R ⁶ , R ⁷ , R ⁸ and R ⁹ may be all hydrocarbon groups, or a compound represented by R ⁶ , R ⁷ , R ⁸ and R ⁹ At least one of them may be a hydrocarbon group and the other may be a hydrogen atom. Among them, 1 to 3 of R ⁶ , R ⁷ , R ⁸ and R ⁹ are hydrocarbon groups and others are hydrogen atoms, and the total number of carbon atoms is 3 to 8
Are preferred. When two of R ⁶ , R ⁷ , R ⁸ and R ⁹ are hydrocarbon groups, the combination is arbitrary, and the same condensed ring (benzene ring) such that R ⁶ and R ⁸ are hydrocarbon groups And two hydrocarbon groups may be bonded to different condensed rings (benzene rings) such that R ⁶ and R ⁷ are hydrocarbon groups. It may be what you have.

Preferred examples of the compound represented by the general formula (2) include, for example, (n-propyl) naphthalene, isopropylnaphthalene, (n-butyl) naphthalene, isobutylnaphthalene, (sec-butyl) Naphthalene, (tert-butyl) naphthalene,
(Sec-pentyl) naphthalene, (1-ethylpropyl) naphthalene, (tert-pentyl) naphthalene,
(1-methylpentyl) naphthalene, (1-ethylbutyl) naphthalene, (1,1-dimethylbutyl) naphthalene, (1-ethyl-1-methylpropyl) naphthalene,
(1-methylhexyl) naphthalene, (1-ethylpentyl) naphthalene, (1-propylbutyl) naphthalene, (1,1-dimethylpentyl) naphthalene, (1-
Ethyl-1-methylbutyl) naphthalene, (1,1-diethylpropyl) naphthalene, (1-methylheptyl)
Naphthalene, (1-ethylhexyl) naphthalene, (1
-Propylpentyl) naphthalene, (1,1-dimethylhexyl) naphthalene, (1-ethyl-1-methylpentyl) naphthalene, (1-methyl-1-propylbutyl) naphthalene, (1,1-diethylbutyl) naphthalene, Ethyl methyl naphthalene, diethyl naphthalene, methyl (n-propyl) naphthalene, methyl isopropyl naphthalene, di (n-propyl) naphthalene, diisopropyl naphthalene, (n-butyl) methyl naphthalene,
Isobutylmethylnaphthalene, (sec-butyl) methylnaphthalene, (tert-butyl) methylnaphthalene, di (n-butyl) naphthalene, diisobutylnaphthalene, di (sec-butyl) naphthalene, di (tert)
-Butyl) naphthalene, trimethylnaphthalene, triethylnaphthalene, ethyldimethylnaphthalene, diethylmethylnaphthalene, dimethyl (n-propyl) naphthalene, dimethylisopropylnaphthalene, methyldi (n-
(Propyl) naphthalene, methyldiisopropylnaphthalene, (n-butyl) dimethylnaphthalene, isobutyldimethylnaphthalene, (sec-butyl) dimethylnaphthalene, (tert-butyl) dimethylnaphthalene, phenylnaphthalene, tolylnaphthalene, xylylnaphthalene, (ethylphenyl) Examples include naphthalene, (vinylphenyl) naphthalene, benzylnaphthalene, phenethylnaphthalene, (1-phenylethyl) naphthalene, and the like. The specific examples include all isomers having different substituent bonding positions. The compound represented by the general formula (2) may be not only a compound having a single structure but also a mixture of compounds having different structures as long as the compound satisfies the general formula (2).

The method for producing the compound represented by the general formula (2) is arbitrary, and can be produced by various known methods. Examples of this include halogenated hydrocarbons having 1 to 10 carbon atoms, olefins having 2 to 10 carbon atoms, or olefins having 8 carbon atoms.
Friedel-Crafts, which is a styrene of 10 to 10, which is a mineral acid such as sulfuric acid, phosphoric acid, silicotungstic acid, hydrofluoric acid, a solid acidic substance such as acid clay and activated clay, and a metal halide such as aluminum chloride and zinc chloride. A method of adding to naphthalene in the presence of an acid catalyst such as a catalyst may be mentioned.

The content of (C) the compound represented by the general formula (2) when used alone is not particularly limited. However, from the viewpoint of the degree of gasification at a high temperature, the content is based on the total amount of insulating oil. It is preferably at least 5% by volume, more preferably at least 10% by volume, even more preferably at least 20% by volume, further preferably at least 30% by volume, and at least 40% by volume. Is still more preferably 50% by volume or more, and still more preferably 60% by volume or more.

In the compound (D) of the present invention represented by the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R ¹³ may be the same or different and each represents a hydrogen atom or a C 1 -C 1. Shows 10, preferably 1 to 8 hydrocarbon groups. Examples of the hydrocarbon group include an alkyl group, an alkenyl group, an aryl group, an alkaryl group, an aralkyl group, and the like. In general formula (3), R ¹⁰ , R ¹¹ ,
Specific examples of preferred hydrocarbon groups represented by R ¹² and R ¹³ include, for example, methyl group, ethyl group, n-
Propyl group, isopropyl group, linear or branched butyl group, linear or branched pentyl group, linear or branched hexyl group, linear or branched heptyl group, linear or 1-8 carbon atoms such as a branched octyl group
An ethenyl group (vinyl group), a 1-propenyl group, a 2-propenyl group (allyl group), a 1-methylethenyl group (isopropenyl group), a linear or branched butenyl group, a linear or branched C2-C8 alkenyl groups such as linear pentenyl group, linear or branched hexenyl group, linear or branched heptenyl group, linear or branched octenyl group; phenyl group, tolyl group , An xylyl group, an ethylphenyl group, a vinylphenyl group or the like having 6 to 8 carbon atoms, an aryl group or an alkaryl group; a benzyl group, a 1-phenylethyl group, a 1-phenylethyl group (phenethyl group) or the like having 7 to 7 carbon atoms. 8 aralkyl groups; and the like. Further, among these, an alkyl group having 1 to 8 carbon atoms and an alkenyl group having 2 to 8 carbon atoms are particularly preferable, and among them, branched ones are preferable.

In the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R
^{13 has} a total carbon number of 1 to 10, preferably 1 to 8
It is. Within this range, R ¹⁰ , R ¹¹ , R ¹² and R ¹³ may be the same or different. That is, as the compound of the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R ¹³ may be all hydrocarbon groups, or
^10, R ^11, the other at least one of hydrocarbon group of R ¹² and R ¹³ may be one hydrogen atom. Among them, it is preferable that 1 to 3 of R ¹⁰ , R ¹¹ , R ¹² and R ¹³ are hydrocarbon groups and the others are hydrogen atoms, and the total number of carbon atoms is 3 to 8. R ¹⁰ , R ¹¹ , R ¹² and R ¹³
When two of them are hydrocarbon groups, the combination is arbitrary, and two or more hydrocarbon groups may be bonded to the same benzene ring such that R ¹⁰ and R ¹² are hydrocarbon groups. Alternatively, one in which one hydrocarbon group is bonded to different benzene rings, such as a case where R ¹⁰ and R ¹¹ are hydrocarbon groups, may be used.

Specific preferred compounds represented by the general formula (3) include, for example, (n-propyl) biphenyl, isopropylbiphenyl, (n-butyl) biphenyl, isobutylbiphenyl, (sec-butyl) Biphenyl, (tert-butyl) biphenyl,
(Sec-pentyl) biphenyl, (1-ethylpropyl) biphenyl, (tert-pentyl) biphenyl,
(1-methylpentyl) biphenyl, (1-ethylbutyl) biphenyl, (1,1-dimethylbutyl) biphenyl, (1-ethyl-1-methylpropyl) biphenyl,
(1-methylhexyl) biphenyl, (1-ethylpentyl) biphenyl, (1-propylbutyl) biphenyl, (1,1-dimethylpentyl) biphenyl, (1-
Ethyl-1-methylbutyl) biphenyl, (1,1-diethylpropyl) biphenyl, (1-methylheptyl)
Biphenyl, (1-ethylhexyl) biphenyl, (1
-Propylpentyl) biphenyl, (1,1-dimethylhexyl) biphenyl, (1-ethyl-1-methylpentyl) biphenyl, (1-methyl-1-propylbutyl) biphenyl, (1,1-diethylbutyl) biphenyl, Ethylmethylbiphenyl, diethylbiphenyl, methyl (n-propyl) biphenyl, methylisopropylbiphenyl, di (n-propyl) biphenyl, diisopropylbiphenyl, (n-butyl) methylbiphenyl,
Isobutylmethylbiphenyl, (sec-butyl) methylbiphenyl, (tert-butyl) methylbiphenyl, di (n-butyl) biphenyl, diisobutylbiphenyl, di (sec-butyl) biphenyl, di (tert
-Butyl) biphenyl, trimethylbiphenyl, triethylbiphenyl, ethyldimethylbiphenyl, diethylmethylbiphenyl, dimethyl (n-propyl) biphenyl, dimethylisopropylbiphenyl, methyldi (n-
Propyl) biphenyl, methyldiisopropylbiphenyl, (n-butyl) dimethylbiphenyl, isobutyldimethylbiphenyl, (sec-butyl) dimethylbiphenyl, (tert-butyl) dimethylbiphenyl, phenylbiphenyl, tolylbiphenyl, xylylbiphenyl, (ethylphenyl) Biphenyl, (vinylphenyl) biphenyl, benzylbiphenyl, phenethylbiphenyl, (1-phenylethyl) biphenyl, and the like. The specific examples include all isomers having different substituent bonding positions. The compound represented by the general formula (3) may be not only a compound having a single structure but also a mixture of compounds having different structures as long as the compound satisfies the general formula (3).

The method for producing the compound represented by the general formula (3) is arbitrary, and can be produced by various known methods. For example, halogenated hydrocarbons having 1 to 10 carbon atoms, olefins having 2 to 10 carbon atoms or styrenes having 8 to 10 carbon atoms are converted into mineral acids such as sulfuric acid, phosphoric acid, silicotungstic acid and hydrofluoric acid. A method of adding to biphenyl in the presence of a solid acidic substance such as acid clay and activated clay and an acid catalyst such as Friedel-Crafts catalyst which is a metal halide such as aluminum chloride and zinc chloride.

The content of the compound (D) when the compound represented by the general formula (3) is used alone is not particularly limited. However, from the viewpoint of the degree of gasification at a high temperature, the content is based on the total amount of insulating oil. It is preferably at least 5% by volume, more preferably at least 10% by volume, even more preferably at least 20% by volume, further preferably at least 30% by volume, and at least 40% by volume. Is still more preferably 50% by volume or more, and still more preferably 60% by volume or more.

Among the above, from the viewpoint of the degree of gasification at a high temperature, linear alkylbenzene and (B) are preferable among (A), and (B) is more preferable. On the other hand, from the viewpoint of satisfying both the degree of gasification at a high temperature and the effect on members (plastic, rubber, etc.) mounted in the tube container in a well-balanced manner, linear alkylbenzenes of (A) are more preferable.

In the insulating oil according to the present invention, the content of the above compounds (A) to (D) when used in combination is not particularly limited. Therefore, the total amount of the compounds (A) to (D) is preferably 5% by volume or more based on the total amount of insulating oil,
It is more preferably 0% by volume or more, further preferably 20% by volume or more, further preferably 30% by volume or more, still more preferably 40% by volume or more, and more preferably 50% by volume or more. It is even more preferred that the content be more than 60% by volume.

Further, among the compounds (A) to (D),
The linear alkylbenzene of (A) and the compound of (B) have a lower gasification degree at a high temperature, and when these are not used, the total amount is set to lower the gasification degree at a high temperature. Is desired to be 30% by volume or more. Further, from the viewpoint of the degree of gasification at a high temperature, it is preferable to satisfy the following expression. V1 + V2 × 0.17 ≧ 5 (% by volume) V1: The total amount (% by volume) of the linear alkylbenzene of (A) and the compound of (B) V2: The branched alkylbenzene of (A), (C) and ( In the above formula, “V1 + V2 × 0.17” is 5% by volume or more, preferably 10% by volume or more, and more preferably 20% by volume or more. More preferably, it is 30% by volume or more, still more preferably 40% by volume or more, even more preferably 50% by volume or more, and most preferably 60% by volume or more.

The insulating oil according to the present invention has the above (A) to
It contains at least one selected from the compounds of (D). That is, the insulating oil according to the present invention
(A)-(D) may be constituted only by the insulating oil,
Further, a mixture with an insulating base oil other than (A) to (D) may be used. As other insulating oil base oils, specifically, for example, a lubricating oil fraction obtained by atmospheric distillation and decompression distillation of crude oil, solvent removal, solvent extraction, hydrocracking, solvent dewaxing, Paraffinic and naphthenic mineral oil-based insulating oil base oils and poly-α-olefins (eg polybutene, 1-octene oligomer , 1-
Decene oligomers), diesters (eg, ditridecyl glutarate, di-2-ethylhexyl adipate,
Diisodecyl adipate, ditridecyl adipate, di-3-ethylhexyl sebacate, etc.), polyol esters (eg, trimethylolpropane caprylate, trimethylolpropane perargonate, pentaerythritol 2-ethylhexanoate, pentaerythritol pelargonate, etc.), poly Examples include synthetic insulating base oils such as oxyalkylene glycol, polyphenyl ether, silicone oil, and perfluoroalkyl ether, and mixtures of two or more of these.

The insulating oil of the present invention may further contain a known additive for insulating oil in order to further enhance its excellent performance. Specifically, for example, a flowing antistatic agent such as benzotriazole;
Ditertiary butyl-4-methylphenol (DBP
C) or phenolic antioxidants such as 2,6-ditert-butylphenol, amine antioxidants such as phenylnaphthylamine, condensates of chlorinated paraffins and naphthalene, polymethacrylates, olefin polymers (ethylene-propylene copolymers, Pour point depressants, etc.). The content of each of these additives is not particularly limited, but is usually preferably 5% by mass or less, more preferably 1% by mass or less, and more preferably 0.1% by mass or less (based on the total amount of insulating oil). Is most preferable.

The kinematic viscosity of the insulating oil of the present invention is not particularly limited, but is usually preferably 1 mm ² / s or more at 40 ° C., more preferably 2 mm ² / s or more. Further, from the viewpoint of cooling properties, it is preferably at most 30 mm ² / s at 40 ° C., more preferably at most 20 mm ² / s, even more preferably at most 10 mm ² / s. Although the pour point of the insulating oil of the present invention is not particularly limited, it is preferably −30 ° C. or lower, more preferably −35 ° C. or lower, from the viewpoint of cold regions. Although the flash point (closed type) of the insulating oil of the present invention is not particularly limited, it is preferably 130 ° C. or higher from the viewpoint of handleability.
More preferably, the temperature is 5 ° C. or higher. Although the total acid value of the insulating oil of the present invention is not particularly limited, it is 0.02 in terms of corrosiveness.
mgKOH / g or less, preferably 0.01 m
It is more preferable that it is not more than gKOH / g. The dielectric breakdown voltage of the insulating oil of the present invention is not particularly limited, but is preferably 30 kV or more from the viewpoint of electrical insulation, and is preferably 40 kV or more.
V or more is more preferable. The dielectric loss tangent (80 ° C., 50 Hz) of the insulating oil of the present invention is not particularly limited, but is preferably 0.1% or less from the viewpoint of dielectric loss.
More preferably, it is 0.05% or less. The volume resistivity (80 ° C.) of the insulating oil of the present invention is not particularly limited, but is preferably 0.5 TΩm or more, more preferably 1 TΩm or more from the viewpoint of electrical insulation. The above properties all show values obtained according to JIS C 2101.

[0053]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

The following oils were used as sample oils in the examples and comparative examples. Sample oil 1: Linear alkylbenzene Sample oil 2: Phenylxylylethane Sample oil 3: Branched alkylbenzene Sample oil 4: Refined mineral oil Each sample oil was used alone and mixed to obtain insulating oils of Examples and Comparative Examples. . Table 1 shows the properties of each insulating oil.

A high-temperature gasification test was performed on each insulating oil by the following method. High-temperature gasification test Each insulating oil was subjected to a pyrolysis unit (PYROPROBE2000).
(CDS INSTRUMENT)) at 800 ° C., and the generated gas was analyzed by gas chromatography. The detection was performed by the FID method. In the analysis by gas chromatography, the peak due to each insulating oil remaining without decomposition and the peak due to the light component generated by decomposition were measured, and the ratio of the peak due to the light component was taken as the decomposition rate. . Table 1 shows the results.

[0056]

[Table 1]

[0057]

As is apparent from the above results, the insulating oil of the present invention has a low decomposition rate at a high temperature and a low degree of gasification, and thus is suitable as an insulating oil for immersing an X-ray tube. For this reason, the X-ray tube apparatus immersed in the insulating oil of the present invention and circulating the insulating oil as required can keep the safety at the time of excessive input to the X-ray tube apparatus. Thus, the tube container can be designed to be smaller and lighter, and can be used with a higher heat load.

[Brief description of the drawings]

FIG. 1 shows an X-ray tube device for a CT scanner as an example of the X-ray tube device of the present invention.

[Description of Signs] 11 X-ray tube 12 Cathode assembly 13 Rotating anode target 14 Insulating oil 15 Tube container 15a X-ray transmitting window 16 Hose 17 Oil cooler 18 Pump for insulating oil circulation 19 Heat exchanger 20 X-ray radiation window 21 Safety valve

Continued on the front page (72) Inventor Yutaka Yamamoto 8 Chidori-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Inside Nishiishi Mitsuishi Co., Ltd. (72) Inventor Hideki Kawate 8 Chidori-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture In-house F-term (reference) 4H104 BA04A LA04 PA12

Claims (3)

[Claims] An insulating oil for immersing an X-ray tube, comprising at least one selected from the following (A) to (D). (A) Alkylbenzene (B) Compound represented by the following general formula (1) (In the general formula (1), R ¹ represents an alkylene group or alkenylene group having 1 to 8 carbon atoms, and R ² , R ³ , R ⁴ and R ⁵ may be the same or different, and are each independently hydrogen. Represents an atom or an alkyl group having 1 to 4 carbon atoms, and the total carbon number of R ¹ , R ² , R ³ , R ⁴ and R ⁵ is 1 to 8.) (C) In the following general formula (2) Compound represented: (In the general formula ^{(2), R 6, R} 7, R 8 and R ⁹ may each be the same or different, each independently represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and R ⁶ , R ⁷ , R ⁸ and R ^{9 have} a total carbon number of 1 to 10.) (D) A compound represented by the following general formula (3): (In the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R ¹³
May be the same or different, each independently represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the total carbon number of R ¹⁰ , R ¹¹ , R ¹² and R ¹³ is 1 to 10 . ) 2. An X-ray tube, a tube container accommodating the X-ray tube,
An X-ray tube device having an insulating oil sealed in a tube container, wherein the insulating oil contains at least one selected from the following (A) to (D): apparatus. (A) alkylbenzene (B) a compound represented by the following general formula (1) (In the general formula (1), R ¹ represents an alkylene group or alkenylene group having 1 to 8 carbon atoms, and R ² , R ³ , R ⁴ and R ⁵ may be the same or different, and are each independently hydrogen. Represents an atom or an alkyl group having 1 to 4 carbon atoms, and the total carbon number of R ¹ , R ² , R ³ , R ⁴ and R ⁵ is 1 to 8.) (C) In the following general formula (2) Compound represented: (In the general formula ^{(2), R 6, R} 7, R 8 and R ⁹ may each be the same or different, each independently represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and R ⁶ , R ⁷ , R ⁸ and R ^{9 have} a total carbon number of 1 to 10.) (D) A compound represented by the following general formula (3): (In the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R ¹³
May be the same or different, each independently represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the total carbon number of R ¹⁰ , R ¹¹ , R ¹² and R ¹³ is 1 to 10 . ) 3. An X-ray tube, a tube container containing the X-ray tube,
X comprising an insulating oil sealed in a tube container, a pump communicating with the tube container and circulating the insulating oil, and an oil cooler unit having a heat exchanger for releasing heat of the insulating oil to the outside.
An X-ray tube device, wherein the insulating oil contains at least one selected from the following (A) to (D). (A) Alkylbenzene (B) Compound represented by the following general formula (1) (In the general formula (1), R ¹ represents an alkylene group or alkenylene group having 1 to 8 carbon atoms, and R ² , R ³ , R ⁴ and R ⁵ may be the same or different, and are each independently hydrogen. Represents an atom or an alkyl group having 1 to 4 carbon atoms, and the total carbon number of R ¹ , R ² , R ³ , R ⁴ and R ⁵ is 1 to 8.) (C) In the following general formula (2) Compound represented: embedded image (In the general formula ^{(2), R 6, R} 7, R 8 and R ⁹ may each be the same or different, each independently represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and R ⁶ , R ⁷ , R ⁸ and R ^{9 have} a total carbon number of 1 to 10.) (D) A compound represented by the following general formula (3): (In the general formula (3), R ¹⁰ , R ¹¹ , R ¹² and R ¹³
May be the same or different, each independently represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the total carbon number of R ¹⁰ , R ¹¹ , R ¹² and R ¹³ is 1 to 10 . )