JPS607002A - Electrically insulating oil composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention is 9111! ! ’+ electrical insulating oil.

Previously, polychlorinated biphenyls could be used as combustible electrical insulation materials, but since their use has been banned due to pollution concerns, silicone has been used for applications where there is no risk of fire, such as for vehicles or indoor transformers. Oil transformers, epoxy cast transformers, dry type transformers, and S'Fa 93 have been used for some time.Many synthetic oils such as maiko and phosphate ester oils have also been proposed. has been done.

However, all of these oils are expensive and have limited applicability, and there has been a demand for a commercial insulating oil with even better performance at a lower price.

It has also been proposed to use flame-retardant oil made of saturated hydrocarbons with a combustion point of 200°C or higher (Japanese Patent Publication No. 55-87
No. 67), but it simply has a high combustion point (not 0), but the properties of the insulating oil are not satisfactory.

The present invention was made to solve these problems, and simultaneously satisfies various properties particularly required for condenser bending, such as hydrogen gas absorption, high dielectric constant, low dielectric loss tangent, high flash point, and low burning rate. The purpose of the present invention is to provide an electrical insulating oil composition.

As a result of 12 studies in line with the above objectives, the inventors found that
It was discovered that an electrical insulating oil composition that achieves the above object can be obtained by blending polyol 1 stell and halogen-containing phosphoric acid ester with aromatic insulating oil in a specific v1 ratio, and the present invention was achieved. .

Specifically, the present invention provides an electrical insulating oil composition characterized by blending 20 to 80 parts by volume of a polyol ester and 2 to 30 parts by volume of a halogen-containing phosphoric acid ester to 100 parts by volume of an aromatic insulating oil. It is.

The Jj IJru''j5 fragrance hx type insulating oil used in the present invention includes:
Alkyldiphenylalkane represented by the following general formula (1), alkyl-bis-7 to alkylhenzene represented by (2), alkylbiphenyl represented by (3), (4
) Aromatic hydrocarbons such as alkylnaphthalenes are used. Moreover, it is also preferably employed to use a mixture of two or more of these.

(R''')2 ...... (2> (In formulas (1) to (4), R', R'' and R'' represent hydrogen, methyl, ethyl, propyl or 1 pull, x ,
y and z represent integers of 1 to 3. Y and Y' are −←CH
2-stone (herein, 11 represents an integer of 1 to 3) or an alkylene group such as CH3. ] Among these aromatic insulating oils, those having a flash point of 160° C. or higher (PM method) are particularly preferably used in the present invention.

The polyol Nisdel used in the present invention has the following general formula (
It is a fatty acid ester of 1-rimedylolpropane represented by 5) or a fatty acid ester of pentaerythritol represented by general formula (6).

CI-12-0-CO-R [In formula (5) and formula (6), R, R', R'', J3
Yohi R″′ is Cn H2fi -1-1 or CnH2
n-+ (here 11 (yo 4-15, preferably 5-10
There are saturated or unsaturated chain hydrocarbons C represented by ), which may be the same or different.

) The flash point of these fatty acids is 240°C or higher, the combustion point is 270"C or higher, the kinematic viscosity is 40csl or lower, the hydroxyl IW is 2mg KOH/(l or lower) and Acid value is 0.05111 (IK Ol-1/ (
+ The following are particularly preferred in the present invention: I+i'.

The halogen-containing phosphoric ester used in the present invention is a compound represented by the following general formula (7).

[In formula (7), R, R' and RJL are halogenated hydrocarbon residues containing 1 to 3 halogens and having 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms, and may be the same or different. Good too.

In addition, R h and R'' may be a hydrocarbon residue having 1 to 12 carbon atoms.) In the present invention, it is particularly preferable that R', R'' and R'' are the same, and as a halogen is preferably fluorine, chlorine or bromine.The above halogenated hydrocarbon residues include -CH2X, -CH20H2X, -CI-1(CH3)CH2X, -CH(CH3)CHX2, -Cs H4CH2X.

-Cs l-I J CI-l X 2 , [wherein, X
does not indicate halogen].

As the halogen-containing phosphate ester preferably used in the present invention, 1 to lis(dichloroisopropyl)
Examples include 1-11-lis(chloroethyl) small sulfate, 1 to lis(monochlorophenyl) small sulfate 1.

The electrical insulating oil composition of the present invention uses an aromatic insulating oil as a base oil, a -C polyol ester and a halogen-containing insulating oil composition.
- Achieved by blending sprues in a fixed proportion.

The polyol Nisdel is used in an amount of 20 to 80 volumes (1 part, preferably 30 to 70 parts) per 100 parts ω of aromatic insulating oil.
It is added to Yomonbu. The blending ratio of polyol Nisdel is 2
If the amount is less than 0 parts by volume, the flash point will be low, which is undesirable from the viewpoint of flame retardancy. Moreover, if the amount exceeds 80 parts, the hydrogen gas absorbency, which is an index of the corona resistance of the capacitor, decreases, which is not preferable.

Halogen-containing phosphate ester is aromatic insulating oil 100
The amount is 2 to 30 parts by volume, preferably 4 to 20 parts by volume, per volume. If the blending ratio of the halogen-containing phosphoric acid ester is less than 2 parts by volume, no effect on the combustion rate or flash point, which is an indicator of gas flammability, will be observed, and if it is more than 30 parts by volume, the dielectric loss tangent will not be observed. becomes large, which is not desirable.

The electrical insulating oil composition of the present invention is applied as an impregnating agent for electrical equipment comprising insulating metal and/or plus deck films. In addition, if necessary, phenolic antioxidants such as di-tert-butyl-p-cresol, amine antioxidants such as phenyl-α-nanoderamine, epoxy biogenic Uj n2 monoester, glycidyl needle type epoxy compounds, aromatic epoxy It is also possible to add additives such as compounds, epoxy compounds such as epoxidized vegetable oils, and benzo-1-lyazoles.

The present invention will be explained below with reference to Examples, but the present invention is not limited thereto.

Example 1 To 100 parts of aromatic insulating oil, 40 parts of fatty acid tetranisdel and 1 to 7 parts of chloroethyl) were added.
- 1 to 4 volumes f2 parts were blended. - The aromatic insulating oils were 8 stone condenser oil S (trade name, manufactured by Nippon Oil Co., Ltd.) and 8 stone Hysol 5AS-Ll-1.
(trade name, manufactured by Nippon Oil Co., Ltd.) 1:1 tN compound was used. In addition, examples of fatty acid tetranisal include pentaerythryl and 7-carbon fatty acid tetra
I used stell.

Table 1 shows the properties of the blended oil and the burning rate according to the JIS C2101 test method.

Example 2 50 volume parts J of 1 to 1 to 50 parts J of aromatic hX-based insulating oil used in Example 1C
3 and 1-lis (ri “11” ethyl) phosphate H@
Added tadabu. The results are shown in Table 1.

Example 3 Actual/+1 For 100 volumes of the aromatic insulating oil used in Example 1, a sample of fatty acid having 7 carbon atoms such as pentaacetol was
40 parts by volume of lysester and 25 parts by volume of 1-lith(di[10-propyl) phosphate] were blended.

The results are shown in Table 1.

Claims (1)

[Claims] 20 parts of polyol ester in 100 volumes of aromatic insulating oil
~80 parts by volume and 2-3 halogen-containing phosphoric esters
An electrical insulating oil composition containing a 0 volume suspension.