JPS5893105A - Flame resistant insulating oil - 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 relates to S-flammable insulating oil, and its objective is to obtain an insulating oil that is flame retardant and has low viscosity.

Recently, there has been a demand for the reduction and downsizing of electrical equipment such as oil-immersed transformers and capacitors.
Silicone oil is now being used instead of BK. This silicone oil is also inexpensive, and a mixture of aryl phosphate and mineral oil-based insulating oil is already known as a flame-retardant insulating oil. However, mineral oil-based insulating oils have a drawback in that they generally have low solubility in aryl phosphates.

Zero Hatsu 1101 is a new S-type insulating oil that contains phosphoric acid triester containing at least one aromatic ring to the saturated fatty acid trithyl ester of trimethylpropane, or It is an object of the present invention to provide a flame-retardant insulating oil in which a phosphoric acid trialkyl ester and/or an alkylphosphonic acid dialkyl ester are further blended with a blended oil.

That is, to summarize the present invention, the tenth invention of the present invention is:
Based on the total composition, add trimethylolpropane, saturated fatty acid (5 to 1st carbon atoms), O triester, and phosphoric acid triester containing at least one aromatic ring.
This invention relates to a flame-retardant insulating oil which is characterized in that it can be blended with a weight of up to 80% by weight. Moreover, the second invention of the present invention further includes a phosphoric acid trialkyl ester and/or an alkylphosphonic acid dialkyl ester based on the entire composition of the #10 invention O flammable insulating oil.

10 to 80% by weight. : The present inventors have discovered that trimethylolpropane and carbon atoms of 5 to 1
50. Any combination of triester with saturated fatty acid or a mixture thereof with trialkyl phosphoric acid ester and/or dialkyl phosphonic acid ester with respect to phosphoric acid triester containing at least one aromatic ring. Even if the ratio is too high, it will dissolve and become a blended oil, and those blended oils are 1. Discovered that it is flame retardant and has low viscosity.

The invention has been completed.

The saturated fatty acid triester of trimethylolpro-15 used in the present invention is trimethylolboupan and a saturated fatty acid triester represented by the following general formula: % formula % (in the formula, %n indicates the number of S to 11) It consists of triesters with fatty acids. The saturated fatty acids of the above formula contain %5~13@0 carbon atoms (i.e. nmS ~ 11); at lower carbon numbers (this), the flash point is too low, while at higher carbon numbers (upper). .

At low temperatures, it becomes more than just one liquid. Therefore, O containing 5 to IS@O atoms is preferable as the saturated fatty acid. First, when a fIA compound of two or more saturated fatty acids containing 5 to 1 sII carbon atoms is used, a saturated fatty acid having a relatively low pour point can be obtained. saturated fat atO
Examples include valeric acid, caproic acid, enanthic acid, caprylic acid, inoctanoic acid, pelargonic acid, decanoic acid and lauric acid, j! Examples include mixed fatty acids of two or more of these fatty acids. In the present invention, triesterification is required in connection with other components and D.

The phosphoric acid triester containing at least one aromatic ring, which is blended with this, refers to the phosphoric acid triester containing at least one aromatic ring.
o Ester component c' 5% At least one aromatic ring is included. nil, diphenyl orthoxylenyl phosphate, tri(ethyl fluorine) phosphate
, triphosphate (inoglovir 7el).

97 acid 7Z=ru/((noprovir fer), phosphorus II
)! j (n-furobylphenyl), phosphorus 11 tri(butylphenyl) & tri(pentylphenyl) phosphate, tri(hexylphenyl) phosphate, tri(hestylphenyl) phosphate, tri(octylfer) phosphate , tri(nonyl 7”=k) 7kU phosphorus, and tri(decylphenyl) phosphate.These O esters are
Although they may be blended alone, a mixture of two or more of these may be blended.゛In addition, typical phosphoric acid trialkyl esters are:
It is represented by the following general formula: % formula % (in the formula, n represents a number from 4 to 110). Examples of phosphate trialkyl esters represented by these general formulas include tributyl phosphate, tripentyl phosphate, trihexfur phosphate, triheptyl phosphate, trioctyl phosphate, trinonyl phosphate, tridecyl phosphate, and tricundecyl phosphate. There is an ester.

Furthermore, a representative formula of the alkylphosphonic acid dialkyl ester is the following general formula: ('nH2n+10)s P (OB"2) (wherein and n are the same - or different), 4 to 90 numbers ).

Examples of alkylphosphonic acid dialkyl esters represented by these general formulas include diptyl butylphosphonate, dipentel pentylphosphonate, dihexyl hexylphosphonate, dihepter heptylphosphonate, dioctyl octylphosphonate, dinonyl nonylphosphonate, and octylphosphonate. There are esters such as diptylate acid.

As mentioned above. The phosphoric acid triplekyl ester and the alkylphosphonic acid dialkyl ester can be blended singly, or a mixture of two or more of them may be blended. Trench 9.

The number of carbon atoms (m and n) in the alkyl group is less than 4,
O has poor compatibility with other esters.

When the upper limit increases, the condition disappears.

The amount of the phosphoric acid triester containing at least one aromatic compound to be added to the saturated fatty acid triester of trimethylolpropane is desirably from sO to 80 wt-1, based on both compositions.

40 to 80 weight is suitable. If it is less than this, no combustible O effect can be expected; on the other hand, if it is much more than the upper limit, the trout electric dissipation tangent will become very high, which is not preferable.

Furthermore, regarding the amount of phosphoric acid trialkyl ester and/or alkylphosphonic acid dialkyl ester O to be blended into the above-mentioned blended oil, from the viewpoint of reducing the viscosity of the above-mentioned blended oil, it is effective at 10% by weight or more based on the total amount. is demonstrated.

On the other hand, if the amount exceeds 60% by weight, the dielectric loss tangent of oil O becomes very high, which is not preferable. Therefore, the blending amount is preferably 10 to 80% by weight.

Next, the effects of the present invention will be explained in detail with reference to Examples, but the present invention is not limited thereto in any way.

The blended oil O flammability in Examples and Comparative Examples was measured as follows.

After immersing a glass tape with a length of 500 mm and a thickness of 125 m in a sample oil of 50 mm for 5 minutes, remove it from the oil, leave it horizontally for 2 minutes, and then immerse one end of the glass tape in the flame of a gas burner. ignite. Burning speed after ignition [(
Flammability is evaluated in seconds/am). If the flame goes out even after one ignition, it is considered to have no flammability.

Example 1 Saturated fatty acid triester of trimethylolpropane 10
Seeds, tricylenyl phosphate, based on both weights, 1
The flammability of the resulting blended oil was measured by blending within the range of 0 to 90% by weight.

First, 10 to 90% by weight of capric acid triester of trimethylolpropane is blended with 4 types of phosphoric acid triesters containing at least one aromatic In, based on the composition, and the resulting blended oil is O combustion. The sex was measured. The results obtained are shown in Tables 1 and 2.

Table 1 (Burning rate of insulating oil) Unit = (sec/am) Table 2 (Burning rate of insulating oil) As is clear from Tables 1 and 2, saturated fatty acid triester of trimethylolpropane has If 30 weight or more of phosphoric acid triester containing at least one aromatic ring is blended based on both compositions, a burning rate equivalent to that of silicone oil can be obtained, and the amount of phosphoric acid triester ≥ 0 is obtained. , 50 weight or more, preferably 40 weight or more.

Example 2 Trichyclenyl phosphate and trimethylolpropane OO
・~al, mixed fatty acid triester 60:400
Trioctyl phosphate or diptyl butylphosphonate is added to the oil blended in a proportion of 10%, respectively, based on the total composition.
~40% by weight was blended, and the viscosity of the resulting blended oil was measured.

The obtained results are shown in Tables 5 and 4.

Table 5 (Viscosity of insulating oil) Unit: ast (sO°C) Table 4 (Viscosity of insulating oil) From Tables 3 and 4, phosphonic trialkyl ester or alkylphosphonic acid dialkyl ester t, Examples 1
It can be seen that when ζ or more is added to the blended oil by 10% by weight or more based on the total composition, the viscosity of the blended oil O is significantly reduced. It is also found that even when these phosphoric acid trialkyl esters and/or alkylphosphonic acid dialkyl esters are blended, a flame-retardant, low-viscosity, and flammable insulating oil can be obtained.

Example 5 Tricresyl phosphate was blended into a trimethylolpropane OOs~cl rich mixed fatty acid triester, and the resulting blended oil O dielectric loss tangent was measured.

9. I electric power of the blended oil obtained by blending 1% trioctyl phosphate with a blended oil containing trimesololpropane OO-01F mixed fatty acid triester and tricresyl phosphate in a ratio of 50:50. The kyphosis was measured.

The obtained results t% are shown in Tables 5 and 6.

Table 5 (Insulating oil O Tsuba Densho *>.

Position: 11 (80°C) Table #144 (Insulating oil O dielectric loss tangent) Unit: Rice (80°C) Add to saturated fatty acid triester from Table 5 and Table 6. Phosphoric acid triester containing at least one aromatic ring has a large dielectric loss tangent when blended with 80% by weight or more. Although it is possible to mix up to 0 weight, it is understood that 60 weight or less is appropriate.

It is also found that the appropriate amount of phosphoric acid trialkyl ester and/or alkylphosphonic acid sialyl ester to be added to these blended oils is 80 weight lee from the viewpoint of dielectric loss tangent.

As explained above, the flame retardant insulating oil according to the present invention is flame retardant and has a low viscosity, and can be used as an insulating oil for oil-filled electrical equipment and equipment for the purpose of downsizing and flame retarding. It is useful.

Patent applicant: Hitachi, Ltd. Agent Nakamoto Mi

Claims (1)

[Claims] t trimethylolpropane, a saturated fatty acid having 5 to 1 carbon atoms, and an O triester, containing at least Ill aromatic rings.
Based on the total composition, the phosphoric triester contained in
A flame-retardant insulating oil characterized in that it can be blended with a weight of 0 to 80%. 1 m) Reester is a mixture of trimethylolpro/(N, saturated fatty acid with 5 to 130 carbon atoms, and 0 triester) according to claim 1. 5. Trimethylolpro I( Based on the composition of phosphoric acid triester containing at least 1% of aromatic rings, S
The insulating oil is characterized by further blending phosphoric acid trialkyl ester and/or alkylphosphophone dialkyl ester with 10 to 0 weight based on the total composition of the insulating oil. Flame retardant insulating oil. 4. The oH flammable insulating oil according to claim 5, wherein the triester is a mixture of trimethylolpropane and a saturated fatty acid having 5 to 130 carbon atoms and an O triester.