JP2010251072A - Electric insulating oil composition - Google Patents

Electric insulating oil composition Download PDF

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JP2010251072A
JP2010251072A JP2009098336A JP2009098336A JP2010251072A JP 2010251072 A JP2010251072 A JP 2010251072A JP 2009098336 A JP2009098336 A JP 2009098336A JP 2009098336 A JP2009098336 A JP 2009098336A JP 2010251072 A JP2010251072 A JP 2010251072A
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insulating oil
oil
mass
oil composition
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Takashi Ono
高志 大野
Masaji Nakamura
正司 中村
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Idemitsu Kosan Co Ltd
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Idemitsu Kosan Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric insulating oil composition having a proper viscosity, an excellent appearance, and excellent oxidation stability while achieving a reduction in manufacturing costs. <P>SOLUTION: The electric insulating oil composition includes a base oil comprising a hydro-refined mineral oil (A) and/or a synthetic oil and a solvent-refined mineral oil (B), and has a kinematic viscosity of 5-15 mm<SP>2</SP>/s at 40°C. The solvent-refined mineral oil (B) has a kinematic viscosity of 5-100 mm<SP>2</SP>/s at 40°C and a sulfur content of 0.03-0.8 mass%. The blending amount of the component (B) is 0.5-10 mass% based on the total amount of the base oil. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は電気絶縁油組成物に関し、さらに詳しくは比較的低粘度であって、流動性が良好であり、外観が良好であって、メンテナンスが容易であり、酸化安定性が良好で長期間使用でき、かつ低コストで製造可能な電気絶縁油組成物に関する。   The present invention relates to an electrical insulating oil composition, and more particularly, has a relatively low viscosity, good fluidity, good appearance, easy maintenance, good oxidation stability and long-term use. The present invention relates to an electrical insulating oil composition that can be produced at low cost.

電気絶縁油は、油入変圧器、ケーブル、コンデンサ等の種々の絶縁機器において使用される。このような電気絶縁油には基本的性能として電気絶縁性能が高いことが要求されるが、実際にそれを使用、管理する上では、それ以外に(i)比較的低粘度であること、(ii)外観が良好であること、(iii)酸化安定性が良好であることが要求される。
粘度が低すぎると揮発性が高くなり引火点が低下して取り扱いにおいて安全上問題になる場合がある。逆に高すぎると流動性が低く装置内で循環しにくくなるので冷却性能を低下させる。
電気絶縁油は十年以上長期間に渡り使用されることが多いため、長寿命であること、つまり酸化安定性が良好であることが要求される。特に大型変圧器の場合、トラブルが発生すると大規模な停電が起こり社会的な影響は計り知れないため、日本では電気絶縁油の保守管理、トラブル事前予知のための管理が徹底されている。このような状況の中で絶縁油の外観色相の確認は、定期点検で絶縁油試料を採取する際に絶縁油が正常であるか否か容易に点検できる有効な方法であり、絶縁油の劣化のおおよその目安になる。一般に絶縁油は劣化が進行すると色相が褐色になる。したがって、絶縁油の初期の外観色相で着色が多いことは状態を管理する上で支障を来たすので、電気絶縁油の外観色相は良好、すなわち無色透明に近いことが要求される。
また、電気絶縁油は通常白土処理仕上げをして製造されるので、白土の廃棄処理が必要となり環境負荷と同時にコスト高の要因になる。そのため、白土処理量を低減して良好な電気絶縁油を得ることが要求される。
Electrical insulating oil is used in various insulating devices such as oil-filled transformers, cables, and capacitors. Such an electrical insulating oil is required to have a high electrical insulation performance as a basic performance, but in actual use and management, (i) it has a relatively low viscosity, ii) Appearance is required, and (iii) Oxidation stability is required.
If the viscosity is too low, the volatility becomes high and the flash point is lowered, which may cause a safety problem in handling. On the other hand, if it is too high, the fluidity is low and it becomes difficult to circulate in the apparatus, so the cooling performance is lowered.
Since electrical insulating oil is often used for a long period of time of ten years or more, it is required to have a long life, that is, good oxidation stability. Especially in the case of large transformers, if a trouble occurs, a large-scale blackout occurs and the social impact is immeasurable. Therefore, in Japan, maintenance management of electrical insulating oil and management for trouble prediction are thorough. In this situation, the appearance hue of the insulating oil is an effective method that can be easily checked to determine whether the insulating oil is normal when collecting the insulating oil sample during periodic inspection. This is an approximate guide. In general, the color of an insulating oil becomes brown as deterioration progresses. Accordingly, the fact that the insulating oil has a lot of coloring in the initial appearance hue hinders the management of the state, and thus the appearance color of the electric insulating oil is required to be good, that is, close to colorless and transparent.
In addition, since the electrical insulating oil is usually manufactured with a white clay finish, it is necessary to dispose of the white clay, which causes an environmental load and a high cost factor. Therefore, it is required to reduce the amount of white clay treated to obtain a good electrical insulating oil.

ところで、近年、特許文献1には、水素化精製鉱油及び/または合成炭化水素油にブライトストックを配合した電気絶縁油が開示されている。しかしながら、ブライトストックは高粘度であり、外観が黒色に近く、かつ極性化合物や不安定化合物等の不純物を多く含んでいる。そのため、電気絶縁油の粘度を適正にすること、外観を良好にすること、酸化安定性を良好にすることが困難であり、精製工程において大量の白土が必要になるという問題が生じる。   Incidentally, in recent years, Patent Document 1 discloses an electrical insulating oil in which bright stock is blended with hydrorefined mineral oil and / or synthetic hydrocarbon oil. However, bright stock has a high viscosity, an appearance close to black, and contains a large amount of impurities such as polar compounds and unstable compounds. Therefore, it is difficult to make the viscosity of the electrical insulating oil appropriate, to improve the appearance, and to improve the oxidation stability, and there arises a problem that a large amount of white clay is required in the refining process.

特開2007−220468号公報JP 2007-220468 A

本発明は上記事情に鑑みなされたもので、適正な粘度を有し、外観が良好であり、酸化安定性に優れ、かつ製造コストを低減できる電気絶縁油組成物を提供することを目的とするものである。   The present invention has been made in view of the above circumstances, and an object thereof is to provide an electrical insulating oil composition having an appropriate viscosity, good appearance, excellent oxidation stability, and capable of reducing manufacturing costs. Is.

本発明者らは、鋭意研究を重ねた結果、特定の基油を使用することで前記課題を解決できることを見出した。本発明はかかる知見に基づいて完成したものである。
すなわち本発明は、
1. (A)水素化精製鉱油及び/または合成油並びに(B)溶剤精製鉱油からなる基油を含有する、40℃における動粘度が5〜15mm2/sの電気絶縁油組成物であって、前記(B)溶剤精製鉱油が、40℃における動粘度が5〜100mm2/s、硫黄分が0.03〜0.8質量%であって、(B)成分の配合量が基油全量基準で0.5〜10質量%である電気絶縁油組成物、
2. 引火点が140℃以上、流動点が−27.5℃以下、JIS C 2101酸化安定性試験(120℃×75時間)におけるスラッジ発生量が0.4質量%以下、全酸価が0.6mgKOH/g以下であり、JIS C 2320の絶縁油の品質規格1種に該当する、前記1に記載の電気絶縁油組成物、
3. 組成物全量基準で0.6質量%以下の白土を用いて白土処理された電気絶縁油組成物であって、引火点が140℃以上、流動点が−27.5℃以下、JIS C 2101酸化安定性試験(120℃×75時間)におけるスラッジ発生量が0.2質量%以下、全酸価が0.4mgKOH/g以下であり、JIS C 2320の絶縁油の品質規格1種に該当する、前記1に記載の電気絶縁油組成物を提供するものである。
As a result of intensive studies, the present inventors have found that the above problem can be solved by using a specific base oil. The present invention has been completed based on such findings.
That is, the present invention
1. An electrically insulating oil composition having a kinematic viscosity at 40 ° C. of 5 to 15 mm 2 / s, comprising (A) a hydrorefined mineral oil and / or synthetic oil and (B) a base oil composed of a solvent refined mineral oil, (B) The solvent refined mineral oil has a kinematic viscosity at 40 ° C. of 5 to 100 mm 2 / s and a sulfur content of 0.03 to 0.8% by mass, and the blending amount of the component (B) is based on the total amount of the base oil. An electrically insulating oil composition that is 0.5 to 10% by mass;
2. Flash point is 140 ° C. or more, pour point is −27.5 ° C. or less, sludge generation amount in JIS C 2101 oxidation stability test (120 ° C. × 75 hours) is 0.4 mass% or less, and total acid value is 0.6 mgKOH The electrical insulating oil composition according to 1, wherein the electrical insulating oil composition is 1 g / g or less and corresponds to one type of quality standard for insulating oil of JIS C 2320,
3. An electrically insulating oil composition treated with a white clay of 0.6% by mass or less based on the total amount of the composition, having a flash point of 140 ° C. or higher, a pour point of −27.5 ° C. or lower, JIS C 2101 oxidation The amount of sludge generated in a stability test (120 ° C. × 75 hours) is 0.2% by mass or less, the total acid value is 0.4 mgKOH / g or less, and it corresponds to the quality standard for insulating oil of JIS C 2320, The electrical insulating oil composition as described in 1 above is provided.

本発明によれば、適正な粘度を有し、外観が良好であり、酸化安定性に優れ、かつ製造コストを低減できる電気絶縁油組成物が得られる。この電気絶縁油組成物は、長期間使用してもスラッジの発生が少なく、さらに劣化確認が容易であり、実用性能に優れるとともに、環境に負荷をかけずに製造することができる。   ADVANTAGE OF THE INVENTION According to this invention, it has an appropriate viscosity, an external appearance is favorable, it is excellent in oxidation stability, and the electrical insulating oil composition which can reduce manufacturing cost is obtained. This electrical insulating oil composition generates little sludge even when used for a long period of time, is easy to check for deterioration, has excellent practical performance, and can be produced without imposing a burden on the environment.

本発明の電気絶縁油組成物においては、(A)水素化精製鉱油及び/または合成油並びに(B)溶剤精製鉱油からなる基油を用いる。
(A)成分として用いられる水素化精製鉱油を製造するための原油としては特に制限なく使用することができ、例えばパラフィン系原油、ナフテン系原油等が挙げられる。
本発明において用いられる水素化精製鉱油は、例えば上記原油の常圧蒸留後の残油を減圧蒸留し、得られた減圧留出油を水素化精製処理したものが挙げられる。また、前記水素化精製処理の他に、脱ろう処理、脱れき処理等の従来公知の精製プロセスを適宜組み合わせて製造してもよい。
ここで、前記水素化精製処理とは、(1)水素化分解による多環化合物の開環及び側鎖の脱アルキル化、(2)異性化、(3)ヘテロ原子を含む炭化水素からの該へテロ原子の除去等が起きるような比較的過酷な条件での水素化処理をいう。
In the electrical insulating oil composition of the present invention, a base oil composed of (A) hydrorefined mineral oil and / or synthetic oil and (B) solvent refined mineral oil is used.
The crude oil for producing the hydrorefined mineral oil used as the component (A) can be used without particular limitation, and examples thereof include paraffinic crude oil and naphthenic crude oil.
Examples of the hydrorefined mineral oil used in the present invention include a product obtained by subjecting the residual oil after the atmospheric distillation of the crude oil to distillation under reduced pressure, and hydrotreating the resulting vacuum distilled oil. Further, in addition to the hydrorefining treatment, a conventionally known purification process such as dewaxing treatment or dewaxing treatment may be combined appropriately.
Here, the hydrorefining treatment includes (1) ring opening of polycyclic compounds by hydrogenolysis and dealkylation of side chains, (2) isomerization, (3) the hydrocarbons containing heteroatoms. This is a hydrogenation process under relatively severe conditions where removal of heteroatoms occurs.

(A)成分として用いられる合成油としては、具体的には、ポリα−オレフィン、(ポリブテン、1−オクテンオリゴマー、1−デセンオリゴマーなど)、ポリブテン、アルキルベンゼン、アルキルナフタレン、アルキルジフェニルアルカン(アルキルジフェニルエタン、アルキルフェニルキシリルエタン、ベンジルトルエンなど)、アルキルビフェニルなどの炭化水素系合成油;ジエステル(ジトリデシルグルタレート、ジ2−エチルヘキシルアジペート、ジイソデシルアジペート、ジトリデシルアジペート、ジ2−エチルヘキシルセパケートなど)、ポリオールエステル(トリメチロールプロパンカプリレート、トリメチロールプロパンベラルゴネート、ペンタエリスリトール2−エチルヘキサノエート、メンタエリスリトールベラルゴネートなど)、ポリオキシアルキレングリコール、ポリフェニルエーテルなどの含酸素合成油;シリコーン油、パーフルオロアルキルエーテルなどが挙げられる。   Specific examples of the synthetic oil used as the component (A) include poly α-olefins (polybutene, 1-octene oligomer, 1-decene oligomer, etc.), polybutene, alkylbenzene, alkylnaphthalene, alkyldiphenylalkane (alkyldiphenyl). Hydrocarbon synthetic oils such as ethane, alkylphenylxylylethane, benzyltoluene, and the like; diesters (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sepacate, etc.) ), Polyol ester (trimethylolpropane caprylate, trimethylolpropane belargonate, pentaerythritol 2-ethylhexanoate, mentaerythritol belargo Chromatography, etc. g), polyoxyalkylene glycol, oxygenated synthetic oils such as polyphenyl ethers; silicone oils, such as perfluoroalkyl ether.

本発明において用いられる水素化精製鉱油や合成油は、40℃における動粘度は5〜30mm2/sが好ましく、7〜20mm2/sがより好ましい。40℃における動粘度が上記範囲内であることで、好ましい動粘度を有する絶縁油組成物が得られる。引火点は、130〜280℃が好ましく、140〜200℃がより好ましい。流動点は、−27.5℃以下が好ましく、−35.0℃以下がより好ましい。全酸価は0.01mgKOH/g以下が好ましい。 Hydrogenated refined mineral oil or synthetic oil used in the present invention has a kinematic viscosity at 40 ° C. is preferably 5~30mm 2 / s, 7~20mm 2 / s is more preferable. When the kinematic viscosity at 40 ° C. is within the above range, an insulating oil composition having a preferable kinematic viscosity can be obtained. The flash point is preferably from 130 to 280 ° C, more preferably from 140 to 200 ° C. The pour point is preferably −27.5 ° C. or lower, more preferably −35.0 ° C. or lower. The total acid value is preferably 0.01 mgKOH / g or less.

本発明において用いられる水素化精製鉱油は、環分析(n−d−M法)における全芳香族分(%CA)は、3〜15%が好ましく、6〜12%がより好ましい。硫黄分は、0.05%以下が好ましく、0.02%以下がより好ましい。 The hydrorefined mineral oil used in the present invention preferably has a total aromatic content (% C A ) in ring analysis (ndM method) of 3 to 15%, more preferably 6 to 12%. The sulfur content is preferably 0.05% or less, and more preferably 0.02% or less.

本発明においては、前記水素化精製鉱油を一種用いてもよく、二種以上を組み合わせて用いてもよい。また前記合成油を一種用いてもよく、二種以上を組み合わせて用いてもよい。さらには、水素化精製鉱油一種以上と合成油一種以上を組み合わせて用いてもよい。   In this invention, the said hydrorefined mineral oil may be used 1 type, and may be used in combination of 2 or more type. Moreover, the said synthetic oil may be used 1 type and may be used in combination of 2 or more type. Further, one or more hydrorefined mineral oils and one or more synthetic oils may be used in combination.

(B)成分として用いられる溶剤精製鉱油を製造するための原料油としては、特に制限なく使用することができ、例えばパラフィン系原油、ナフテン系原油等が挙げられる。
前記溶剤精製鉱油は、例えば前記原油の常圧蒸留後の残油を減圧蒸留し、得られた減圧留出油を溶剤抽出処理したものが挙げられる。また、前記溶剤抽出処理の他に、脱ろう処理、脱れき処理、水素化仕上げ等の従来公知の精製プロセスを適宜組み合わせて製造してもよい。
ここで、前記水素化仕上げとは、通常、比較的低圧で水添処理が行われ、色相改善等を目的に行われるものであり、前記水素化精製処理とは異なるものである。本発明においては、以下に示すように特定の動粘度を示すような減圧留出油を用いて溶剤精製を行うことで、その留分に含まれる硫黄化合物等を利用して酸化安定性を向上させる。
(B) As a raw material oil for manufacturing the solvent refined mineral oil used as a component, it can use without a restriction | limiting especially, For example, paraffin type | system | group crude oil, naphthenic crude oil, etc. are mentioned.
Examples of the solvent refined mineral oil include those obtained by subjecting the residual oil after the atmospheric distillation of the crude oil to distillation under reduced pressure, and subjecting the resulting reduced-pressure distillate to solvent extraction. Further, in addition to the solvent extraction treatment, a conventionally known purification process such as dewaxing treatment, dewaxing treatment, and hydrofinishing may be combined as appropriate.
Here, the hydrofinishing is usually performed for the purpose of improving the hue, etc., by performing a hydrogenation process at a relatively low pressure, and is different from the hydrorefining process. In the present invention, by performing solvent refining using a reduced pressure distillate that exhibits a specific kinematic viscosity as shown below, the oxidation stability is improved by utilizing a sulfur compound contained in the distillate. Let

前記溶剤精製鉱油は、40℃における動粘度が5〜100mm2/sである。5mm2/s未満であると、揮発性が高くなりすぎて、安全上問題が生じるおそれがあり、100mm2/sを超えると、電気絶縁油組成物の粘度調製が困難になるという問題や不純物が多く含まれることによって発生する色相、安定性、白土処理量等に関する問題が生じやすくなる。当該観点から、40℃における動粘度はより好ましくは、5〜50mm2/s、特に好ましくは9〜15mm2/sである。
前記溶剤精製鉱油は、硫黄分が0.03〜0.8質量%である。0.03質量%未満または0.8質量%を超えると酸化安定性が低下しやすくなる。当該観点から、硫黄分は好ましくは0.1〜0.7質量%、より好ましくは、0.3〜0.6質量%である。なお、上記のように溶剤精製鉱油は動粘度および精製方法によって限定されたものであり、特定の硫黄化合物が電気絶縁油組成物に含まれることになる。このため、本発明の電気絶縁油組成物は優れた酸化安定性を示す。
The solvent refined mineral oil has a kinematic viscosity at 40 ° C. of 5 to 100 mm 2 / s. If it is less than 5 mm 2 / s, the volatility becomes too high, which may cause a safety problem, and if it exceeds 100 mm 2 / s, it is difficult to adjust the viscosity of the electrical insulating oil composition. As a result, a problem relating to the hue, stability, white clay processing amount, and the like that occur due to the presence of a large amount of is likely to occur. From this viewpoint, the kinematic viscosity at 40 ° C. is more preferably 5 to 50 mm 2 / s, and particularly preferably 9 to 15 mm 2 / s.
The solvent refined mineral oil has a sulfur content of 0.03 to 0.8 mass%. If it is less than 0.03% by mass or exceeds 0.8% by mass, the oxidation stability tends to decrease. From this viewpoint, the sulfur content is preferably 0.1 to 0.7% by mass, more preferably 0.3 to 0.6% by mass. In addition, as above-mentioned, solvent refined mineral oil is limited by kinematic viscosity and the refinement | purification method, and a specific sulfur compound is contained in an electrically insulating oil composition. For this reason, the electrical insulating oil composition of the present invention exhibits excellent oxidation stability.

前記溶剤精製鉱油は、引火点は、130〜280℃が好ましく、140〜220℃がより好ましい。流動点は、−5℃以下が好ましく、−10℃以下がより好ましい。全酸価は0.01mgKOH/g以下が好ましい。   The solvent refined mineral oil has a flash point of preferably 130 to 280 ° C, more preferably 140 to 220 ° C. The pour point is preferably −5 ° C. or lower, and more preferably −10 ° C. or lower. The total acid value is preferably 0.01 mgKOH / g or less.

本発明においては、溶剤精製鉱油を一種用いてもよく、二種以上を組み合わせて用いてもよい。
本発明の電気絶縁油組成物における基油は、前記水素化精製鉱油及び/または合成油〔(A)成分〕並びに前記溶剤精製鉱油〔(B)成分〕からなり、(B)成分の配合量は、基油全量基準で0.5〜10質量%である。0.5質量%未満であると、酸化安定性が低下し、10質量%を超えると、流動点が高くなる。当該観点から、配合量はより好ましくは1〜7質量%であり、特に好ましくは2〜4質量%である。
このように、本発明の電気絶縁油組成物は、ブライトストックのような高粘度の油を使用するものではない。このため、低粘度で無色の電気絶縁油組成物が得られ、さらに後述するように白土処理量を低下することができる。
本発明の電気絶縁油組成物における基油の配合量は、組成物全量基準で、通常80〜100質量%、好ましくは、90〜100質量%、特に好ましくは100質量%である。
In the present invention, one kind of solvent refined mineral oil may be used, or two or more kinds may be used in combination.
The base oil in the electrical insulating oil composition of the present invention comprises the hydrorefined mineral oil and / or synthetic oil [component (A)] and the solvent refined mineral oil [component (B)], and the blending amount of component (B) Is 0.5 to 10% by mass based on the total amount of base oil. When it is less than 0.5% by mass, the oxidation stability is lowered, and when it exceeds 10% by mass, the pour point is increased. From this viewpoint, the blending amount is more preferably 1 to 7% by mass, and particularly preferably 2 to 4% by mass.
Thus, the electrical insulating oil composition of the present invention does not use a high viscosity oil such as bright stock. For this reason, a low-viscosity and colorless electrical insulating oil composition can be obtained, and the amount of white clay treated can be reduced as described later.
The blending amount of the base oil in the electrical insulating oil composition of the present invention is usually 80 to 100% by mass, preferably 90 to 100% by mass, particularly preferably 100% by mass, based on the total amount of the composition.

本発明の電気絶縁油組成物は上記成分の他に添加剤を配合してもよい。添加剤としては、フェノール系酸化防止剤、窒素系酸化防止剤、硫黄系酸化防止剤等の酸化防止剤やベンゾトリアゾール等の金属不活化剤、ポリアルキルメタクリレートなどの流動点降下剤が挙げられる。   The electrical insulating oil composition of the present invention may contain additives in addition to the above components. Additives include antioxidants such as phenolic antioxidants, nitrogenous antioxidants, sulfurous antioxidants, metal deactivators such as benzotriazole, and pour point depressants such as polyalkylmethacrylates.

本発明の電気絶縁油組成物は、40℃における動粘度は、5〜15mm2/sであり、好ましくは5.0〜10.0mm2/sである。5mm2/s未満であると、揮発性が高くなり、引火点が低下し、安全上問題が生じる場合がある。15mm2/sを越えると、流動性が低く、装置内で循環しにくくなるので冷却性能に影響を与えることになる。引火点は、通常140℃以上、好ましくは150℃以上である。引火点が140℃以上であることで安全性に優れる。流動点は、通常−27.5℃以下、好ましくは−35℃以下である。流動点が−27.5℃以下であることで低温条件下でも優れた性能を発揮する。JIS C 2101酸化安定性試験(120℃×75時間)におけるスラッジ発生量は、通常0.4%以下、好ましくは0.1%以下である。全酸価は、通常0.6mgKOH/g以下、好ましくは0.3mgKOH/g以下である。なお、本発明の電気絶縁油組成物は、JIS C 2320の絶縁油の品質規格1種に該当することが好ましい。 Electrical insulating oil composition of the present invention, the kinematic viscosity at 40 ° C., a 5 to 15 mm 2 / s, preferably 5.0~10.0mm 2 / s. If it is less than 5 mm 2 / s, the volatility is increased, the flash point is lowered, and a safety problem may occur. If it exceeds 15 mm 2 / s, the fluidity is low and it becomes difficult to circulate in the apparatus, so that the cooling performance is affected. The flash point is usually 140 ° C. or higher, preferably 150 ° C. or higher. A flash point of 140 ° C. or higher provides excellent safety. The pour point is usually −27.5 ° C. or lower, preferably −35 ° C. or lower. Since the pour point is −27.5 ° C. or lower, excellent performance is exhibited even under low temperature conditions. The amount of sludge generated in the JIS C 2101 oxidation stability test (120 ° C. × 75 hours) is usually 0.4% or less, preferably 0.1% or less. The total acid value is usually 0.6 mgKOH / g or less, preferably 0.3 mgKOH / g or less. In addition, it is preferable that the electrical insulation oil composition of this invention corresponds to 1 type of quality standards of the insulation oil of JISC2320.

本発明の電気絶縁油組成物を製造する際は、従来公知の方法により白土処理を行ってもよい。白土処理を行うことでさらに優れた特性を有する電気絶縁油組成物が得られる。従来、白土処理を行った後に残る廃白土には多大な処理費用を要すると共に、環境への負荷が大きいという問題があった。本発明の電気絶縁油組成物においては白土処理を行う場合であっても少量で優れた特性を有する電気絶縁油組成物が得られる。   When producing the electrical insulating oil composition of the present invention, the clay may be treated by a conventionally known method. By performing the clay treatment, an electrical insulating oil composition having further excellent characteristics can be obtained. Conventionally, there is a problem that waste white clay remaining after the white clay treatment requires a large amount of processing costs and has a large environmental load. In the electrical insulating oil composition of the present invention, an electrical insulating oil composition having excellent characteristics can be obtained in a small amount even when a clay treatment is performed.

白土処理を行う場合は、通常組成物全量基準で、0.6質量%以下の白土を使用すればよく、好ましくは0.2〜0.5質量%である。このような白土処理を行うことでさらに優れた電気絶縁油組成物が得られ、好ましいものとして、例えば、引火点が140℃以上、流動点が−27.5℃以下、JIS C 2101酸化安定性試験(120℃×75時間)におけるスラッジ発生量が0.2質量%以下、全酸価が0.4mgKOH/g以下の電気絶縁油組成物が挙げられる。   When carrying out the clay treatment, 0.6 mass% or less of clay may be used, usually 0.2 to 0.5 mass%, based on the total amount of the composition. By performing such a clay treatment, a further excellent electrical insulating oil composition can be obtained, and preferable examples thereof include a flash point of 140 ° C. or higher, a pour point of −27.5 ° C. or lower, and JIS C 2101 oxidation stability. Examples include an electrical insulating oil composition having a sludge generation amount of 0.2% by mass or less and a total acid value of 0.4 mgKOH / g or less in a test (120 ° C. × 75 hours).

次に、本発明を実施例により具体的に説明するが、これらの実施例になんら制限されるものではない。
水素化精製鉱油、溶剤精製鉱油として以下の油A〜Eを使用した。
油A:水素化精製パラフィン系鉱油
油B:水素化精製ナフテン系鉱油
油C:溶剤精製パラフィン系鉱油
油D:溶剤精製パラフィン系鉱油
油E:溶剤精製パラフィン系鉱油(ブライトストック)
EXAMPLES Next, although an Example demonstrates this invention concretely, it is not restrict | limited to these Examples at all.
The following oils A to E were used as hydrorefined mineral oil and solvent refined mineral oil.
Oil A: Hydrorefined paraffinic mineral oil B: Hydrorefined naphthenic mineral oil C: Solvent refined paraffinic mineral oil D: Solvent refined paraffinic mineral oil E: Solvent refined paraffinic mineral oil (Brightstock)

第1表にこれらの油の性状を示す。なお、この性状は以下の測定法により得られたものである。
動粘度(40℃、100℃)、粘度指数:JIS K 2283に準拠して測定した。
密度:JIS K 2249に準拠して測定した。
引火点:JIS K 2265(クリーブランド開放式)に準拠して測定した。
屈折率:JIS K 0062に準拠して測定した。
流動点:JIS K 2269に準拠して測定した。
酸価:JIS K 2501に準拠して測定した。
硫黄分:JIS K2541に準拠して測定した。
環分析:ASTM D−3238 環分析(n−d−M法)により測定した。
Table 1 shows the properties of these oils. This property was obtained by the following measurement method.
Kinematic viscosity (40 ° C., 100 ° C.), viscosity index: Measured according to JIS K 2283.
Density: Measured according to JIS K 2249.
Flash point: Measured according to JIS K 2265 (Cleveland open type).
Refractive index: Measured according to JIS K 0062.
Pour point: Measured according to JIS K 2269.
Acid value: measured in accordance with JIS K 2501.
Sulfur content: measured in accordance with JIS K2541.
Ring analysis: Measured by ASTM D-3238 ring analysis (ndM method).

Figure 2010251072
Figure 2010251072

上記の油を使用して、第2表−1、第2表−2に示す配合により絶縁油組成物を調製し、以下の試験を行った。試験結果を第3表に示す。   Using the oils described above, insulating oil compositions were prepared according to the formulations shown in Tables 2 and 2 and the following tests were performed. The test results are shown in Table 3.

動粘度(40℃、100℃):JIS K 2283に準拠して測定した。
引火点:JIS K 2265(クリーブランド開放式)に準拠して測定した。
流動点:JIS K 2269に準拠して測定した。
酸価:JIS K 2501に準拠して測定した。
色相:JIS K 2580(セイボルト)およびASTMD−1500(ASTM)に準拠して測定した。
電気特性:JIS C 2101に準拠して測定した。
酸化安定性:JIS C 2101に準拠し、120℃で75時間後のスラッジ量(質量%)と全酸価(mgKOH/g)を測定した。
Kinematic viscosity (40 ° C., 100 ° C.): Measured according to JIS K 2283.
Flash point: Measured according to JIS K 2265 (Cleveland open type).
Pour point: Measured according to JIS K 2269.
Acid value: measured in accordance with JIS K 2501.
Hue: Measured according to JIS K 2580 (Seybolt) and ASTM D-1500 (ASTM).
Electrical characteristics: Measured according to JIS C 2101.
Oxidation stability: Based on JIS C2101, sludge amount (mass%) and total acid value (mgKOH / g) after 75 hours at 120 ° C. were measured.

Figure 2010251072
Figure 2010251072

Figure 2010251072
Figure 2010251072

本発明によれば、適正な粘度を有し、外観着色が低減化され、酸化安定性、電気特性に優れ、製造時の白土処理量を低減化できる電気絶縁油組成物が得られる。この電気絶縁油組成物は、長期間使用してもスラッジの発生が少なく、さらに劣化確認が容易であり、実用性能に優れる。また、上記のように本発明の電気絶縁油組成物はその製造時の精製段階において白土処理量を低減化でき環境負荷が小さい電気絶縁油組成物である。   According to the present invention, there can be obtained an electrical insulating oil composition having an appropriate viscosity, reduced appearance coloring, excellent oxidation stability and electrical characteristics, and capable of reducing the amount of clay treated during production. This electrical insulating oil composition generates little sludge even when used for a long period of time, is easy to check for deterioration, and has excellent practical performance. In addition, as described above, the electrical insulating oil composition of the present invention is an electrical insulating oil composition that can reduce the amount of white clay treated in the refining stage at the time of production and has a small environmental load.

Claims (3)

(A)水素化精製鉱油及び/または合成油並びに(B)溶剤精製鉱油からなる基油を含有する、40℃における動粘度が5〜15mm2/sの電気絶縁油組成物であって、
前記(B)溶剤精製鉱油が、40℃における動粘度が5〜100mm2/s、硫黄分が0.03〜0.8質量%であって、(B)成分の配合量が基油全量基準で0.5〜10質量%である電気絶縁油組成物。
An electrically insulating oil composition having a kinematic viscosity at 40 ° C. of 5 to 15 mm 2 / s, comprising (A) a hydrorefined mineral oil and / or synthetic oil and (B) a base oil composed of a solvent refined mineral oil,
The (B) solvent refined mineral oil has a kinematic viscosity at 40 ° C. of 5 to 100 mm 2 / s, a sulfur content of 0.03 to 0.8% by mass, and the blending amount of the component (B) is based on the total amount of the base oil. The electrical insulating oil composition which is 0.5-10 mass%.
引火点が140℃以上、流動点が−27.5℃以下、JIS C 2101酸化安定性試験(120℃×75時間)におけるスラッジ発生量が0.4質量%以下、全酸価が0.6mgKOH/g以下であり、JIS C 2320の絶縁油の品質規格1種に該当する、請求項1に記載の電気絶縁油組成物。   Flash point is 140 ° C. or more, pour point is −27.5 ° C. or less, sludge generation amount in JIS C 2101 oxidation stability test (120 ° C. × 75 hours) is 0.4 mass% or less, and total acid value is 0.6 mgKOH The electrical insulating oil composition according to claim 1, which is 1 g / g or less and corresponds to one type of quality standard for insulating oil according to JIS C 2320. 組成物全量基準で0.6質量%以下の白土を用いて白土処理された電気絶縁油組成物であって、引火点が140℃以上、流動点が−27.5℃以下、JIS C 2101酸化安定性試験(120℃×75時間)におけるスラッジ発生量が0.2質量%以下、全酸価が0.4mgKOH/g以下であり、JIS C 2320の絶縁油の品質規格1種に該当する、請求項1に記載の電気絶縁油組成物。   An electrically insulating oil composition treated with a white clay of 0.6% by mass or less based on the total amount of the composition, having a flash point of 140 ° C. or higher, a pour point of −27.5 ° C. or lower, JIS C 2101 oxidation The amount of sludge generated in a stability test (120 ° C. × 75 hours) is 0.2% by mass or less, the total acid value is 0.4 mgKOH / g or less, and it corresponds to the quality standard for insulating oil of JIS C 2320, The electrical insulating oil composition according to claim 1.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011204498A (en) * 2010-03-26 2011-10-13 Jx Nippon Oil & Energy Corp Electric insulating oil and method of manufacturing the same
WO2014157217A1 (en) * 2013-03-25 2014-10-02 出光興産株式会社 Electrical insulating oil composition
CN104342251A (en) * 2014-09-24 2015-02-11 中国石油化工股份有限公司 High-ignition-point electrical insulation oil composition and application thereof
CN105181940A (en) * 2015-10-29 2015-12-23 大庆市日上仪器制造有限公司 Anti-explosion automatic ventilation insulating oil corrosive sulfur determination instrument
JP2021163659A (en) * 2020-03-31 2021-10-11 出光興産株式会社 Electrical insulating oil composition

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JPH06325622A (en) * 1993-04-22 1994-11-25 Japan Energy Corp Insulating oil and manufacture thereof
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JPH11263985A (en) * 1998-03-18 1999-09-28 Japan Energy Corp Production of electrical insulating oil

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JPH06325622A (en) * 1993-04-22 1994-11-25 Japan Energy Corp Insulating oil and manufacture thereof
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JPH11263985A (en) * 1998-03-18 1999-09-28 Japan Energy Corp Production of electrical insulating oil

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011204498A (en) * 2010-03-26 2011-10-13 Jx Nippon Oil & Energy Corp Electric insulating oil and method of manufacturing the same
WO2014157217A1 (en) * 2013-03-25 2014-10-02 出光興産株式会社 Electrical insulating oil composition
JPWO2014157217A1 (en) * 2013-03-25 2017-02-16 出光興産株式会社 Electrical insulating oil composition
CN104342251A (en) * 2014-09-24 2015-02-11 中国石油化工股份有限公司 High-ignition-point electrical insulation oil composition and application thereof
CN105181940A (en) * 2015-10-29 2015-12-23 大庆市日上仪器制造有限公司 Anti-explosion automatic ventilation insulating oil corrosive sulfur determination instrument
JP2021163659A (en) * 2020-03-31 2021-10-11 出光興産株式会社 Electrical insulating oil composition
JP7382886B2 (en) 2020-03-31 2023-11-17 出光興産株式会社 Electrical insulation oil composition

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