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JP7190353B2 - Methods for improving lubricating oil release in hydraulic systems - Google Patents

Methods for improving lubricating oil release in hydraulic systems Download PDF

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JP7190353B2
JP7190353B2 JP2018545688A JP2018545688A JP7190353B2 JP 7190353 B2 JP7190353 B2 JP 7190353B2 JP 2018545688 A JP2018545688 A JP 2018545688A JP 2018545688 A JP2018545688 A JP 2018545688A JP 7190353 B2 JP7190353 B2 JP 7190353B2
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ガラパリ，スラバニ
ケンズラー，ジェニファー・リン・カレン
コールマン，アン・テイラー
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Shell Internationale Research Maatschappij BV
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
    • C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C10M2203/1025—Aliphatic fractions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/17—Fisher Tropsch reaction products
    • C10M2205/173—Fisher Tropsch reaction products used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/08—Hydraulic fluids, e.g. brake-fluids

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Description

本発明は、油圧系内の潤滑油の放気を向上させる方法に関連する。 The present invention relates to a method for improving lubricating oil release in a hydraulic system.

潤滑油は、保護、動きを滑らかにし、動力の伝達を助けるために、油圧系に必要とされる。油圧系の設計における現在の趨勢は、より小型のリザーバ、短い油滞留時間、及び高い動力出力に向かっている。これらの変化は、空気混入の問題の増加に繋がっている。空気混入は、（典型的には１ｍｍ未満の直径を有する）気泡が潤滑油全体に分散している現象である。混入した空気は、遊離空気（系の一部内に閉じ込められたひとまとまりの空気）、溶存空気（潤滑油は、６～１２質量パーセントの間の溶存空気を含有し得る）、及び泡（油の表面上に集まる、直径が１ｍｍよりも一般的に大きい気泡）とは区別され得る。空気混入は、潤滑性の喪失、潤滑油の酸化の可能性、動作中の騒音、効率の低下、及びより高い油温度を含む多くの有害な結果をもたらし得る。 Lubricants are required in hydraulic systems for protection, lubrication, and to aid in power transmission. Current trends in hydraulic system design are toward smaller reservoirs, shorter oil residence times, and higher power output. These changes have led to increased air entrainment problems. Air entrainment is the phenomenon in which air bubbles (typically with a diameter of less than 1 mm) are dispersed throughout the lubricating oil. Entrained air can be free air (a mass of air entrapped within a portion of the system), dissolved air (a lubricating oil can contain between 6 and 12 mass percent dissolved air), and foam (a air bubbles, generally larger than 1 mm in diameter, which collect on the surface). Air entrainment can have many detrimental consequences, including loss of lubricity, possible oxidation of the lubricant, noise during operation, reduced efficiency, and higher oil temperatures.

潤滑油の空気混入性は、一般的にＡＳＴＭ Ｄ３４２７放気試験を使用して計測される。試験は、試験条件下及び指定の温度において、油に混入した空気が体積の０．２％まで低減するために必要とされる時間を計測する。 Air entrapment of lubricating oils is commonly measured using the ASTM D3427 air release test. The test measures the time required for the air entrained oil to reduce to 0.2% of its volume under the test conditions and at the specified temperature.

本発明は、油圧系に使用される潤滑油の空気混入性を向上させることを目指している。 The present invention aims to improve the aeration properties of lubricating oils used in hydraulic systems.

したがって、本発明は、油圧系内の潤滑油の放気を向上させる方法を提供し、該方法は、油圧系に潤滑油を供給することを含み、
潤滑油は、潤滑油の質量に基づいて少なくとも９０質量％の基油を含み、基油の質量に基づいて少なくとも７０質量％はＧＴＬ基油であり、
ＧＴＬ基油の１００℃での粘度は、２～２０ｃＳｔであり、
潤滑油は、潤滑油の質量に基づいて１０質量％未満の添加剤を含み、
潤滑油の４０℃での粘度は、２０～１００ｃＳｔであり、
放気が、ＡＳＴＭ Ｄ３４２７に従って計測され、７０質量％未満のＧＴＬ基油を含む潤滑油を使用して達成される放気と比較して向上される。 Accordingly, the present invention provides a method for improving the release of lubricant in a hydraulic system, the method comprising supplying lubricant to the hydraulic system,
The lubricating oil comprises at least 90 wt% base oil, based on the weight of the lubricating oil, and at least 70 wt%, based on the weight of the base oil, is a GTL base oil;
The viscosity of the GTL base oil at 100° C. is 2 to 20 cSt,
The lubricating oil contains less than 10% by weight of additives based on the weight of the lubricating oil;
The viscosity of the lubricating oil at 40 ° C. is 20 to 100 cSt,
Air release is measured according to ASTM D3427 and is improved compared to air release achieved using lubricating oils containing less than 70% by weight GTL base oil.

本発明者らは、潤滑油中の基油が主にＧＴＬ基油であるとき、放気の向上が達成されることを発見した。 The inventors have discovered that improved air release is achieved when the base oil in the lubricating oil is predominantly a GTL base oil.

本発明は、油圧系内の潤滑油の放気を向上させる方法を提供する。油圧系において、潤滑油は、機械の動きを滑らかにするためだけでなく、圧力を伝達するために使用される。空気混入は、油圧のふわふわとしたまたは不規則な動作の原因となり、気圧装置内で著しい問題になり得る。 The present invention provides a method for improving lubricating oil release in a hydraulic system. In hydraulic systems, lubricating oil is used to transmit pressure as well as to lubricate mechanical motion. Air entrapment causes floppy or erratic operation of hydraulics and can be a significant problem in pneumatic systems.

放気は、ＡＳＴＭ Ｄ３４２７（バージョン１４ａ、２０１５年）に従って計測される。圧縮された空気を、５０℃の温度まで熱された潤滑油中に吹き込む。気流を止めた後、油に混入した空気が体積の０．２％まで低減するために必要とされる時間を、放気時間として記録する。望ましい放気の数値は、一般的に３分未満、好ましくは６０秒未満、最も好ましくは２０秒未満である。 Air release is measured according to ASTM D3427 (version 14a, 2015). Compressed air is blown into the lubricating oil heated to a temperature of 50°C. The time required for the air entrained in the oil to reduce to 0.2% of its volume after the air flow is stopped is recorded as the air release time. Desirable air release figures are generally less than 3 minutes, preferably less than 60 seconds, and most preferably less than 20 seconds.

放気は、７０質量％未満のＧＴＬ基油を含む潤滑油を使用して達成される放気と比較して向上する。比較は、唯一の違いが存在するＧＴＬ基油の量である、実質的に同等の潤滑油の間で行われた。例えば、比較は、その粘度が等しく、同じ添加剤を含有する潤滑油の間で行われるべきである。比較用潤滑油において、非ＧＴＬ基油の量はより多くなる。非ＧＴＬ基油は、例えば、ＡＰＩ基油分類のグループＩ、ＩＩ、またはＩＩＩからの基油である。７０質量％未満のＧＴＬ基油を有する潤滑油（及びＧＴＬ基油がグループＩ、ＩＩ、またはＩＩＩの基油で置き換えられた場合）と比較して、少なくとも７０質量％のＧＴＬ基油を組み込むことで、本発明者らは放気時間の向上を観察した。 Air release is improved compared to that achieved using lubricating oils containing less than 70 wt% GTL base oil. Comparisons were made between substantially equivalent lubricating oils with the only difference being the amount of GTL base oil present. For example, comparisons should be made between lubricating oils whose viscosities are equal and which contain the same additives. In the comparative lubricant, the amount of non-GTL base oil is higher. Non-GTL base oils are, for example, base oils from Groups I, II, or III of the API base oil classification. Incorporating at least 70% by weight of GTL base oil compared to lubricants having less than 70% by weight of GTL base oil (and when the GTL base oil is replaced with a Group I, II, or III base oil) , we observed an improvement in air release time.

潤滑油は、油圧系に標準的な方法を用いて供給される。 Lubricating oil is supplied to the hydraulic system using standard methods.

潤滑油は、潤滑油の質量に基づいて、少なくとも９０質量％の基油を含む。少なくとも７０質量％は、基油の質量に基づいて、ＧＴＬ基油である。好ましくは、少なくとも７５質量％はＧＴＬ基油である。ＧＴＬ基油は、天然ガスを液体燃料に変えるフィッシャー・トロプシュ法により合成される。ＧＴＬ基油は、原油から精製される鉱油基油と比較して非常に低い硫黄成分及び芳香族成分を有し、非常に高いパラフィン組成比を有する。基油の質量に基づいて、最大３０質量％（好ましくは最大２５質量％）は、ＡＰＩ（Ａｍｅｒｉｃａｎ Ｐｅｔｒｏｌｅｕｍ Ｉｎｓｔｉｔｕｔｅ）基油分類のグループＩ、ＩＩ、及びＩＩＩから選択される従来の基油を含む別の種類の基油であってもよい。本発明の一実施形態において、基油は、グループＩ、グループＩＩ、またはグループＩＩＩから選択される少なくとも１０質量％の基油を含む。 The lubricating oil comprises at least 90% by weight base oil, based on the weight of the lubricating oil. At least 70% by weight, based on the weight of the base oil, is a GTL base oil. Preferably, at least 75% by weight is GTL base oil. GTL base oils are synthesized by the Fischer-Tropsch process that converts natural gas into liquid fuels. GTL base oils have very low sulfur and aromatic content and a very high paraffinic composition compared to mineral base oils refined from crude oil. Up to 30% by weight (preferably up to 25% by weight), based on the weight of the base oil, another comprising conventional base oils selected from Groups I, II, and III of the API (American Petroleum Institute) base oil classification. It may be a base oil of the type In one embodiment of the invention, the base oil comprises at least 10% by weight base oil selected from Group I, Group II, or Group III.

ＧＴＬ基油の１００℃での動粘度は、２～２０ｃＳｔであり、好ましくは３～１５ｃＳｔであり、さらに好ましくは３～１０ｃＳｔである。粘度は、ＡＳＴＭ Ｄ４４５を用いて好適に計測される。 The GTL base oil has a kinematic viscosity at 100° C. of 2 to 20 cSt, preferably 3 to 15 cSt, more preferably 3 to 10 cSt. Viscosity is suitably measured using ASTM D445.

潤滑油は、潤滑油の質量に基づいて、１０質量％未満の添加剤を含む。好ましくは、添加剤の量は５質量％未満である。好ましくは、添加剤の量は少なくとも０．５質量％である。添加剤は、抗酸化剤、耐摩耗添加剤、解乳化剤、乳化剤、サビ及び腐食抑止剤、粘度指数向上剤、ならびに／または摩擦調整剤を含み得る。添加剤は、例えば無灰添加剤パッケージまたは亜鉛系添加剤パッケージのような添加剤パッケージとして供給され得る。 The lubricating oil contains less than 10% by weight of additives, based on the weight of the lubricating oil. Preferably, the amount of additive is less than 5% by weight. Preferably, the amount of additive is at least 0.5% by weight. Additives may include antioxidants, antiwear additives, demulsifiers, emulsifiers, rust and corrosion inhibitors, viscosity index improvers, and/or friction modifiers. Additives can be supplied as additive packages, such as, for example, ashless additive packages or zinc-based additive packages.

潤滑油の４０℃での動粘度は、２０～１００ｃＳｔであり、好ましくは２５～８０ｃＳｔである。動粘度は、ＡＳＴＭ Ｄ４４５（ＡＳＴＭ Ｄ７０４２）を用いて好適に計測される。この範囲の粘度が、油圧系内での使用に好適な潤滑油を提供する。 The kinematic viscosity of the lubricating oil at 40° C. is 20-100 cSt, preferably 25-80 cSt. Kinematic viscosity is suitably measured using ASTM D445 (ASTM D7042). Viscosities in this range provide lubricating oils suitable for use within hydraulic systems.

本発明は、実施例という形により下記でさらに詳細に説明されるが、本発明はそれらの実施例によって決して限定されない。 The invention is explained in more detail below in the form of examples, but the invention is in no way limited by these examples.

実施例１
１１の異なる基油混合物を、以下の３つの基油の組み合わせを用いて調製した。
１）ＸＨＶＩ ８（１００℃でおよそ８ｃＳｔの動粘度を有するＳｈｅｌｌから入手可能なフィッシャー・トロプシュ派生油）
２）Ｙｕｂａｓｅ ８（１００℃でおよそ８ｃＳｔの動粘度を有するＳＫ Ｌｕｂｒｉｃａｎｔｓから入手可能なグループＩＩＩの基油）
３）Ｃｈｅｖｒｏｎ ２２０ Ｒ（１００℃でおよそ８ｃＳｔの動粘度を有するＣｈｅｖｒｏｎから入手可能なグループＩＩの基油） Example 1
Eleven different base oil blends were prepared using the following three base oil combinations.
1) XHVI 8 (Fischer-Tropsch derived oil available from Shell with a kinematic viscosity of approximately 8 cSt at 100°C)
2) Yubase 8 (a Group III base oil available from SK Lubricants with a kinematic viscosity of approximately 8 cSt at 100°C)
3) Chevron 220 R (Group II base oil available from Chevron with a kinematic viscosity of approximately 8 cSt at 100°C)

基油混合物の放気時間を、５０℃でＡＳＴＭ Ｄ３４２７の方法を用いて試験した。表１は、（混合物の総量に基づいた質量％で表示された）各混合物に存在する各基油の量及び５０℃での放気時間を示す。表１の混合物は全てＩＳＯ ４６である。

Figure 0007190353000001
The air release time of the base oil mixture was tested using the method of ASTM D3427 at 50°C. Table 1 shows the amount of each base oil present in each mixture (expressed in weight percent based on the total weight of the mixture) and the air release time at 50°C. All mixtures in Table 1 are ISO 46.
Figure 0007190353000001

結果は、７５～１００ｗｔ％のＧＴＬを有する混合物（混合物１、２、９、１０、及び１１）が非常に速い放気を示した。７０％未満のＧＴＬを有する全ての他の混合物は、著しく遅い放気時間を有した。 The results showed that mixtures with 75-100 wt% GTL (Mixtures 1, 2, 9, 10, and 11) had very fast outgassing. All other mixtures with GTL less than 70% had significantly slower air release times.

実施例２
放気時間は、一般的に添加剤の追加でより悪化すると考えられる。本発明に従って完全に配合された油圧油が放気における変化に耐えることを証明するために、ＸＨＶＩ ８（１００℃でおよそ８ｃＳｔの粘度を有するＳｈｅｌｌから入手可能なフィッシャー・トロプシュ派生油）及び以下のいずれかの異なる量を用いて混合物を調製した。
１）添加剤パッケージ１（無灰添加剤パッケージ）
２）添加剤パッケージ２（亜鉛系添加剤）
表２は、各添加剤パッケージにおける（混合物の総量に基づいた質量％で表示された）混合物のＸＨＶＩ ８との構成及び対応する放気時間を示す。

Figure 0007190353000002
Example 2
Air release time is generally believed to be worse with the addition of additives. To demonstrate that fully formulated hydraulic fluids in accordance with the present invention withstand variations in air release, XHVI 8 (a Fischer-Tropsch derived oil available from Shell having a viscosity of approximately 8 cSt at 100°C) and the following Mixtures were prepared using different amounts of either.
1) Additive Package 1 (Ashless Additive Package)
2) Additive package 2 (zinc-based additive)
Table 2 shows the composition of the mixture with XHVI 8 and the corresponding air release times (expressed in weight percent based on the total weight of the mixture) in each additive package.
Figure 0007190353000002

結果は、添加剤パッケージの追加（無灰または亜鉛系のいずれも）が潤滑油の放気性に対して著しい影響を及ぼさないことを示す。 The results show that the addition of additive packages (either ashless or zinc-based) has no significant effect on the air release properties of the lubricant.

Claims (5)

油圧系内の潤滑油の放気を向上させる方法であって、前記方法は、前記油圧系に前記潤滑油を供給することを含み、
前記潤滑油は、前記潤滑油の質量に基づいて少なくとも９０質量％の基油を含み、前記基油の質量に基づいて少なくとも７０質量％はＧＴＬ基油であり、前記基油はグループＩ、グループＩＩ、またはグループＩＩＩから選択される非ＧＴＬ基油を少なくとも１０質量％含み、
前記ＧＴＬ基油の１００℃での粘度は、２～２０ｃＳｔであり、
前記潤滑油は、前記潤滑油の前記質量に基づいて１０質量％未満の添加剤を含み、
前記潤滑油の４０℃での粘度は、２０～１００ｃＳｔであり、
ＡＳＴＭ Ｄ３４２７に従って計測される放気が、前記ＧＴＬ基油がグループＩ、グループＩＩ、またはグループＩＩＩから選択される非ＧＴＬ基油に置き換えられることにより７０質量％未満のＧＴＬ基油を含み、粘度が等しく、同じ添加剤を含有する比較用潤滑油を使用して達成される放気と比較して、向上される、前記方法。 1. A method of improving the release of lubricant in a hydraulic system, the method comprising supplying the lubricant to the hydraulic system,
The lubricating oil comprises at least 90% by weight, based on the weight of the lubricating oil, of a base oil, and at least 70% by weight , based on the weight of the base oil, is a GTL base oil, the base oil being Group I, at least 10% by weight of a non-GTL base oil selected from Group II, or Group III;
The GTL base oil has a viscosity at 100° C. of 2 to 20 cSt,
the lubricating oil comprises less than 10% by weight of additives based on the weight of the lubricating oil;
The viscosity of the lubricating oil at 40° C. is 20 to 100 cSt,
containing less than 70% by weight GTL base oil by replacing the GTL base oil with a non-GTL base oil selected from Group I, Group II, or Group III, the air release measured according to A STM D3427 ; improved air release achieved using a comparable lubricating oil of equal viscosity and containing the same additives . 前記ＧＴＬ基油の１００℃での粘度が、３～１０ｃＳｔである、請求項１に記載の方法。 The method of claim 1 , wherein the GTL base oil has a viscosity of 3 to 10 cSt at 100°C. 前記潤滑油は、前記潤滑油の前記質量に基づいて５質量％未満の添加剤を含む、請求項１または２に記載の方法。 3. The method of claim 1 or 2 , wherein the lubricating oil comprises less than 5% by weight of additives based on the weight of the lubricating oil. 前記潤滑油は、前記潤滑油の前記質量に基づいて少なくとも０．５質量％の添加剤を含む、請求項１～３のいずれか一項に記載の方法。 A method according to any preceding claim, wherein the lubricating oil comprises at least 0.5% by weight of additives based on the weight of the lubricating oil. 前記潤滑油の４０℃での粘度が、２５～８０ｃＳｔである、請求項１～４のいずれか一項に記載の方法。 A method according to any preceding claim, wherein the lubricating oil has a viscosity of 25 to 80 cSt at 40 °C.
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