JP2020105350A - Grease composition - Google Patents
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- JP2020105350A JP2020105350A JP2018245121A JP2018245121A JP2020105350A JP 2020105350 A JP2020105350 A JP 2020105350A JP 2018245121 A JP2018245121 A JP 2018245121A JP 2018245121 A JP2018245121 A JP 2018245121A JP 2020105350 A JP2020105350 A JP 2020105350A
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- 0 CCCC(C)CC(C)(C)C(C)(C)C(CC(C)*)c1ccccc1 Chemical compound CCCC(C)CC(C)(C)C(C)(C)C(CC(C)*)c1ccccc1 0.000 description 1
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Abstract
Description
本発明は、グリース組成物に係り、更に詳細には、密封潤滑部などに好適なグリース組成物に関する。 The present invention relates to a grease composition, and more particularly to a grease composition suitable for a hermetically sealed lubrication part and the like.
産業機械等に用いられるグリース組成物は、増ちょう剤と呼ばれる微細な固体を潤滑油基油に分散し、半固体状にした潤滑剤であり、上記増ちょう剤としては、リチウム塩やカルシウム塩などのアルカリ金属石鹸、尿素樹脂、フッ素樹脂やメラミン樹脂などの樹脂の他、シリカゲルやベントンのような無機質物質が知られている。 A grease composition used in industrial machines is a semisolid lubricant obtained by dispersing a fine solid called a thickener in a lubricating base oil, and the thickener may be a lithium salt or a calcium salt. In addition to alkali metal soaps such as, urea resins, resins such as fluororesins and melamine resins, inorganic substances such as silica gel and benton are known.
潤滑油基油に添加する増ちょう剤は、グリース組成物の用途や使用環境等に応じて使い分けされている。 Thickeners to be added to lubricating base oils are properly used according to the application of the grease composition and the operating environment.
例えば、特許文献１の特開２０１４−１９４２７６号公報にはポリアルファオレフィン油にリチウム石鹸及びスチレンイソプレン樹脂を添加した樹脂用グリース組成物が記載され、特許文献２の特開２００７−２９７４２２号公報には、基油及び増ちょう剤を含有するグリース組成物にフッ素系界面活性剤及びスチレン系ブロック共重合体を含有させることで耐摩耗特性・耐疲労特性が向上する旨が記載されている。 For example, JP-A-2014-194276 of Patent Document 1 describes a grease composition for resin in which lithium soap and styrene isoprene resin are added to polyalphaolefin oil, and JP-A-2007-297422 of Patent Document 2. Describes that a grease composition containing a base oil and a thickener contains a fluorine-based surfactant and a styrene block copolymer to improve wear resistance and fatigue resistance.
また、特許文献３の特開平７−１１２７６号公報には、潤滑油にシックナー及び水素化スチレン-イソプレンブロック共重合体を添加したグリース組成物は、良好な耐水性と付着性を有し、低温度における良好なポンプ作動性を有する旨が記載されている。 Further, in JP-A-7-11276 of Patent Document 3, a grease composition obtained by adding a thickener and a hydrogenated styrene-isoprene block copolymer to a lubricating oil has good water resistance and adhesiveness, and has a low viscosity. It is stated that it has good pumpability at temperature.
さらに、特許文献４の特開２００２−３２７１８８号公報には、アルカジエンとしてイソプレンブロックを有するスチレン系ブロック共重合体を増ちょう剤に用いることでグリース組成物の潤滑油成分の分離を防止できる旨が記載されている。 Further, JP-A-2002-327188 of Patent Document 4 states that separation of a lubricating oil component of a grease composition can be prevented by using a styrene block copolymer having an isoprene block as an alkadiene as a thickener. Have been described.
しかしながら、特許文献４に記載の潤滑剤組成物にあっては、耐候性、耐熱老化性が低く、ちょう度が変化し易いため、使用により軟化し密封潤滑部などへの適用が困難である。 However, the lubricant composition disclosed in Patent Document 4 has low weather resistance and low heat aging resistance, and the consistency is likely to change. Therefore, the lubricant composition is softened by use and is difficult to be applied to a sealed lubrication part or the like.
本発明は、このような従来技術の有する課題に鑑みてなされたものであり、その目的とするところは、潤滑油成分の分離がなく、長期に亘りちょう度変化が少ないグリース組成物を提供することにある。 The present invention has been made in view of the problems of the prior art as described above, and an object thereof is to provide a grease composition that does not separate a lubricating oil component and has a small consistency change over a long period of time. Especially.
本発明者は、上記目的を達成すべく鋭意検討を重ねた結果、増ちょう剤として、金属石鹸などを使用せずに化学的に安定な水素添加スチレン−イソプレンブロック共重合体のみを用いることにより、上記目的が達成できることを見出し、本発明を完成するに至った。 The present inventors have conducted extensive studies to achieve the above object, and as a thickener, by using only a chemically stable hydrogenated styrene-isoprene block copolymer without using metal soap or the like. The inventors have found that the above objects can be achieved, and completed the present invention.
即ち、上記課題は、本発明の下記（１）〜（３）により解決される。
（１）潤滑油基油と増ちょう剤とを含み、
上記増ちょう剤が、下記構造式で表されるブロック共重合体のみから成り、
上記ブロック共重合体のスチレン含有量が３５〜３６質量％であり、平均分子量が９万〜１２万であることを特徴とするグリース組成物。
That is, the said subject is solved by the following (1)-(3) of this invention.
(1) contains a lubricating base oil and a thickener,
The thickener is composed only of a block copolymer represented by the following structural formula,
A grease composition characterized in that the block copolymer has a styrene content of 35 to 36 mass% and an average molecular weight of 90,000 to 120,000.
（２）上記増ちょう剤を１０〜３０質量％含有することを特徴とする（１）に記載のグリース組成物。
（３）上記潤滑油基油の粘度指数（ＶＩ）が１０〜１４０であることを特徴とする（１）又は（２）に記載のグリース組成物。
(2) The grease composition as described in (1), which contains the thickener in an amount of 10 to 30% by mass.
(3) The grease composition according to (1) or (2), wherein the lubricating base oil has a viscosity index (VI) of 10 to 140.
本発明によれば、増ちょう剤として、水素添加スチレン−イソプレンブロック共重合体のみを用いることとしたため、長期に亘りちょう度変化が小さなグリース組成物を提供することができる。 According to the present invention, since only the hydrogenated styrene-isoprene block copolymer is used as the thickener, it is possible to provide a grease composition having a small consistency change over a long period of time.
本発明のグリース組成物について詳細に説明する。
上記グリース組成物は、潤滑油基油と増ちょう剤とを含み、該増ちょう剤が、下記構造式で表される水素添加スチレン‐イソプレンブロック共重合体のみから成る。
The grease composition of the present invention will be described in detail.
The grease composition contains a lubricating base oil and a thickener, and the thickener is composed only of a hydrogenated styrene-isoprene block copolymer represented by the following structural formula.
増ちょう剤とは、液体の潤滑油基油を立体的な網目構造中に保持し、潤滑油基油を半固体のゲル状にするものである。 The thickener is a substance that holds a liquid lubricating base oil in a three-dimensional network structure and turns the lubricating base oil into a semi-solid gel form.
本発明は、増ちょう剤として、ハードセグメントのポリスチレンブロックとソフトセグメントの水素添加ポリイソプレンブロックとを有し、スチレン含有量が３５〜３６質量％である水素添加スチレン‐イソプレンブロック共重合体を用いる。 The present invention uses, as a thickener, a hydrogenated styrene-isoprene block copolymer having a hard segment polystyrene block and a soft segment hydrogenated polyisoprene block and having a styrene content of 35 to 36% by mass. ..
上記ポリスチレンブロックは、剛直でガラス転移温度（Ｔｇ）が高く、Ｔｇ以下において分子鎖が絡み合う物理架橋点として作用し、増ちょう剤全体の構造を３次元網目構造の様な構造にして潤滑油基油を保持する。 The polystyrene block is rigid and has a high glass transition temperature (Tg) and acts as a physical cross-linking point at which molecular chains are entangled at a temperature of Tg or less, and the structure of the entire thickener is changed to a structure like a three-dimensional network structure to form a lubricating oil group. Holds the oil.
また、ソフトセグメントの水素添加ポリイソプレンは、増ちょう剤全体の絡み合い点間の分子量を大きくして潤滑油基油の吸油性を向上させると共に、側鎖のメチル基によりソフトセグメント自体の分子運動が抑制され、上記ポリスチレンブロックと相俟って増ちょう剤に適度な柔軟性を発現させ、せん断安定性を向上させる。 In addition, the hydrogenated polyisoprene of the soft segment improves the oil absorption of the lubricating base oil by increasing the molecular weight between the entanglement points of the thickener as a whole, and the molecular motion of the soft segment itself by the side chain methyl group. Suppressed, and in combination with the polystyrene block, the thickener exhibits appropriate flexibility and shear stability is improved.
さらに、上記ソフトセグメントは、不飽和結合を全く含まない非常に安定な構造であるため、耐候性、耐熱老化性に優れ、長期に亘り、グリース組成物のちょう度変化を極めて小さくすることができる。 Further, since the soft segment has a very stable structure containing no unsaturated bond, it is excellent in weather resistance and heat aging resistance, and can change the consistency of the grease composition to be extremely small for a long period of time. ..
上記増ちょう剤のスチレン含有量が３５質量％未満では、潤滑油基油の保持力が低下し、潤滑油基油を吸収できずに分離し易くなり、３６質量％を超えると、グリース組成物の流動性が低下する。 If the styrene content of the thickener is less than 35% by mass, the holding power of the lubricating base oil will be reduced, and the lubricating base oil will not be absorbed and will be easily separated. If it exceeds 36% by mass, the grease composition Liquidity is reduced.
上記増ちょう剤は、質量平均分子量が９万〜１２万であり、９万〜１１万が好ましく、９万〜１０万であることがより好ましい。質量平均分子量が９万未満では、含有量を増やしても半固体のゲル状態にならずチキソ性を発現しない。また、質量平均分子量が１２万を超えると、潤滑油基油を吸収し難くなり、加熱して潤滑油基油を吸収させたとしても、グリース組成物の流動を起こすために必要なせん断応力、すなわち降伏応力が大きくなって流動性が低下する。 The above-mentioned thickener has a mass average molecular weight of 90,000 to 120,000, preferably 90,000 to 110,000, and more preferably 90,000 to 100,000. When the mass average molecular weight is less than 90,000, even if the content is increased, a semisolid gel state does not occur and thixotropic properties are not exhibited. Further, when the mass average molecular weight exceeds 120,000, it becomes difficult to absorb the lubricating base oil, and even if the lubricating base oil is heated to absorb the shear stress necessary for causing the grease composition to flow, That is, the yield stress increases and the fluidity decreases.
水素添加スチレン‐イソプレンブロック共重合体の質量平均分子量が９万〜１０万であると、加熱せずに潤滑油基油と混合し撹拌することでグリース化することができ、加熱による潤滑油基油の劣化を防止できるため好ましい。また、水素添加スチレン‐イソプレンブロック共重合体がパウダー状であると、さらにグリース化が容易になる。 When the mass average molecular weight of the hydrogenated styrene-isoprene block copolymer is 90,000 to 100,000, it can be made into a grease by mixing with a lubricating base oil and stirring without heating, and a lubricating oil base by heating can be obtained. It is preferable because deterioration of oil can be prevented. Further, if the hydrogenated styrene-isoprene block copolymer is in the form of powder, it becomes easier to form a grease.
上記増ちょう剤として使用できる水素添加スチレン‐イソプレンブロック共重合体としては、例えば、セプトン１００１、セプトン１０２０（いずれもクラレ社製）を挙げることができる。 Examples of hydrogenated styrene-isoprene block copolymers that can be used as the thickener include Septon 1001 and Septon 1020 (both manufactured by Kuraray Co., Ltd.).
本発明のグリース組成物は、上記増ちょう剤を１０〜３０質量％含有することが好ましく、１５質量％〜２５質量％含有することがより好ましい。
上記増ちょう剤の含有量が１０質量％未満では、グリース増ちょう剤として求められる
増ちょう性が得られず、潤滑油基油の粘度増ちょうに留まり十分機能を満たさない。３０質量％を超えると、グリース組成物が硬くなりすぎて潤滑性及び製品化に問題を生じる。
The grease composition of the present invention preferably contains the above-mentioned thickener in an amount of 10 to 30% by mass, more preferably 15 to 25% by mass.
When the content of the thickener is less than 10% by mass, the thickening property required as a grease thickener cannot be obtained, and only the viscosity of the lubricating base oil is thickened and the function is not sufficiently satisfied. When it exceeds 30% by mass, the grease composition becomes too hard, which causes problems in lubricity and commercialization.
上記潤滑油基油としては、グリース組成物として用いられている従来公知の合成油、鉱物油の他、植物油などを使用することができる。 As the lubricating base oil, in addition to conventionally known synthetic oils and mineral oils used as grease compositions, vegetable oils and the like can be used.
上記合成油としては、例えば、ポリαオレフィン、エチレンαオレフィンオリゴマー、ジエステル、ポリオールエステル、アルキルジフェニルエーテル、ポリフェニルエーテル、流動パラフィンなどを挙げることができ、また、上記植物油としては、ひまし油、菜種油などを挙げることができる。 Examples of the synthetic oil include poly α-olefins, ethylene α-olefin oligomers, diesters, polyol esters, alkyl diphenyl ethers, polyphenyl ethers, liquid paraffin, and the like, and the vegetable oils include castor oil and rapeseed oil. Can be mentioned.
上記潤滑油基油は、粘度指数（ＶＩ）が１０〜１４０であることが好ましい。具体的には、潤滑油基油が鉱物油である場合は４０℃の動粘度が５ｃｓｔ〜５００ｃｓｔ、１００℃の動粘度が２ｃｓｔ〜４０ｃｓｔ、また、合成油である場合は、４０℃の動粘度が３０ｃｓｔ〜１３００ｃｓｔ、１００℃の動粘度が５ｃｓｔ〜１３０ｃｓｔである。 The lubricating base oil preferably has a viscosity index (VI) of 10 to 140. Specifically, when the lubricating base oil is a mineral oil, the kinematic viscosity at 40° C. is 5 cst to 500 cst, the kinematic viscosity at 100° C. is 2 cst to 40 cst, and when it is a synthetic oil, the kinematic viscosity at 40° C. Is 30 cst to 1300 cst, and the kinematic viscosity at 100° C. is 5 cst to 130 cst.
上記グリース組成物は、必要に応じて、酸化防止剤、防錆剤、極圧剤、摩耗防止剤、消泡材、清浄分散剤、粘度指数向上剤、乳化剤、流動点降下剤、腐食防止剤等を含有してもよい。 The grease composition is, if necessary, an antioxidant, a rust preventive, an extreme pressure agent, an antiwear agent, a defoaming agent, a detergent dispersant, a viscosity index improver, an emulsifier, a pour point depressant, a corrosion inhibitor. Etc. may be contained.
上記グリース組成物は、従来公知の方法で作製することができる。具体的には、潤滑油基油と増ちょう剤を混合し、必要に応じて、増ちょう剤のガラス転移温度以上に加熱し撹拌することで作製できる。 The grease composition can be prepared by a conventionally known method. Specifically, it can be prepared by mixing a lubricating base oil and a thickener, and if necessary, heating the mixture to a temperature not lower than the glass transition temperature of the thickener and stirring.
上記グリース組成物は、自動車産業、鉄鋼産業、電気産業、ロボット産業、航空産業、医療、食品産業など、あらゆる産業機械の駆動部や軸受け部などの潤滑部に使用できるが、潤滑油基油の分離がなく、長期に亘りちょう度変化が小さいため、メンテナンスが困難な密封潤滑部などに、特に好適に使用できる。 The grease composition can be used in the lubrication part such as the drive part and bearing part of all industrial machines such as automobile industry, steel industry, electric industry, robot industry, aviation industry, medical care, food industry, etc. Since there is no separation and the change in consistency is small over a long period of time, it can be used particularly suitably for a hermetically lubricated portion that is difficult to maintain.
以下、本発明を実施例により詳細に説明するが、本発明は下記実施例に限定されるものではない。 Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to the following Examples.
［実施例１］
増ちょう剤として、パウダー状の下記構造式ＳＥＰで表される水素添加スチレン‐イソプレンブロック共重合体（セプトン１０２０、クラレ社製：スチレン含有量３６質量％、平均分子量９５０００、ＪＩＳ Ａ硬度７０）が１５質量％になるように、鉱物油、ポリαオレフィン、エステル油の３種類の潤滑油基油にそれぞれ混合し、室温で撹拌分散後、ロール処理して３種類のグリース組成物を得た。
表１に、鉱物油、ポリαオレフィン、エステル油の粘度及び粘度指数を示す。
[Example 1]
As a thickener, powdered hydrogenated styrene-isoprene block copolymer represented by the following structural formula SEP (Septon 1020, manufactured by Kuraray Co., Ltd.: styrene content 36% by mass, average molecular weight 95,000, JIS A hardness 70) is used. Three kinds of lubricating oil base oils of mineral oil, poly-α-olefin, and ester oil were mixed so as to be 15% by mass, and after stirring and dispersion at room temperature, roll processing was performed to obtain three kinds of grease compositions.
Table 1 shows the viscosity and viscosity index of mineral oils, poly-α-olefins and ester oils.
［実施例２］
増ちょう剤として、ペレット状の上記構造式ＳＥＰで表される水素添加スチレン‐イソプレンブロック共重合体（セプトン１００１、クラレ社製：スチレン含有量３５質量％、平均分子量１１４０００、ＪＩＳ Ａ硬度８０）が１５質量％になるように、鉱物油、ポリαオレフィン、エステル油の３種類の潤滑油基油にそれぞれ混合し、８０℃に加熱し撹拌分散後、ロール処理して３種類のグリース組成物を得た。
[Example 2]
As a thickener, a pelletized hydrogenated styrene-isoprene block copolymer represented by the above structural formula SEP (Septon 1001, manufactured by Kuraray Co., Ltd.: styrene content 35% by mass, average molecular weight 114000, JIS A hardness 80) is used. Three kinds of lubricating oil base oils of mineral oil, poly-α-olefin and ester oil were mixed so as to be 15% by mass, heated to 80° C., stirred and dispersed, and roll-treated to obtain three kinds of grease compositions. Obtained.
［参考例１］
ペレット状の下記構造式ＳＥＰＳで表される水素添加スチレン‐イソプレン−スチレンブロック共重合体（セプトン２００４、クラレ社製：スチレン含有量１８質量％、平均分子量８万、ＪＩＳ Ａ硬度６７）が１５質量％になるように、鉱物油、ポリαオレフィン、エステル油の３種類の潤滑油基油にそれぞれ混合し、５０℃に加熱し撹拌したが、水素添加スチレン‐イソプレン‐スチレンブロック共重合体と潤滑油基油とが分離し、ロール処理できず、３種類の潤滑油基油いずれもグリース化できなかった。
[Reference Example 1]
The pelletized hydrogenated styrene-isoprene-styrene block copolymer represented by the following structural formula SEPS (Septon 2004, manufactured by Kuraray Co., Ltd.: styrene content 18% by mass, average molecular weight 80,000, JIS A hardness 67) is 15% by mass. %, mixed with three types of lubricating base oils, mineral oil, poly-α-olefin, and ester oil, and heated to 50°C and stirred, but lubricated with hydrogenated styrene-isoprene-styrene block copolymer. It was separated from the oil base oil and could not be roll-treated, and none of the three types of lubricating base oils could be made into grease.
［参考例２］
ペレット状の上記構造式ＳＥＰＳで表される水素添加スチレン‐イソプレン‐スチレンブロック共重合体（セプトン２１０４、クラレ社製：スチレン含有量６５質量％、平均分子量７万、ＪＩＳ Ａ硬度９８）が１５質量％になるように、鉱物油、ポリαオレフィン、エステル油の３種類の潤滑油基油にそれぞれ混合し、５０℃に加熱し撹拌したが、水素添加スチレン‐イソプレン‐スチレンブロック共重合体と潤滑油基油とが分離し、ロール処理できず、３種類の潤滑油基油いずれもグリース化できなかった。
[Reference Example 2]
The hydrogenated styrene-isoprene-styrene block copolymer represented by the structural formula SEPS in a pellet form (Septon 2104, manufactured by Kuraray Co., Ltd.: styrene content 65 mass%, average molecular weight 70,000, JIS A hardness 98) is 15 mass. %, mixed with three types of lubricating base oils, mineral oil, poly-α-olefin, and ester oil, and heated to 50°C and stirred, but lubricated with hydrogenated styrene-isoprene-styrene block copolymer. It was separated from the oil base oil and could not be roll-treated, and none of the three types of lubricating base oils could be made into grease.
［参考例３］
パウダー状の下記構造式ＳＥＥＰＳで表される水素添加スチレン‐ポリ（エチレンイソプレン）ブロック‐スチレンブロック共重合体（セプトン４０３３、クラレ社製：スチレン含有量３０質量％、平均分子量７万、ＪＩＳ Ａ硬度７６）が１５質量％になるように、鉱物油、ポリαオレフィン、エステル油の３種類の潤滑油基油にそれぞれ混合し、５０℃に加熱し撹拌したが、水素添加スチレン‐ポリ（エチレンイソプレン）ブロック‐スチレンブロック共重合体と潤滑油基油とが分離し、ロール処理できず３種類の潤滑油基油いずれもグリース化できなかった。
[Reference Example 3]
Powdered hydrogenated styrene-poly(ethylene isoprene) block-styrene block copolymer represented by the following structural formula SEEPS (Septon 4033, manufactured by Kuraray Co., Ltd.: styrene content 30% by mass, average molecular weight 70,000, JIS A hardness) 76) 15% by mass was mixed with each of three types of lubricating base oils of mineral oil, poly-α-olefin and ester oil, and the mixture was heated to 50° C. and stirred, but hydrogenated styrene-poly(ethylene isoprene) was used. ) The block-styrene block copolymer and the lubricating base oil were separated from each other, and could not be roll-treated, and none of the three types of lubricating base oils could be made into grease.
［参考例４］
パウダー状の下記構造式ＳＥＢＳで表される水素添加スチレン−ポリ（エチレンブチレン）ブロック‐スチレンブロック共重合体（セプトン８００４、クラレ社製：スチレン含有量３１質量％、平均分子量９万、ＪＩＳ Ａ硬度８０）が１５質量％になるように、鉱物油、ポリαオレフィン、エステル油の３種類の潤滑油基油にそれぞれ混合し、５０℃に加熱し撹拌したが、水素添加スチレン−ポリ（エチレンブチレン）ブロック‐スチレンブロック共重合体と潤滑油基油とが分離し、ロール処理できず３種類の潤滑油基油いずれもグリース化できなかった。
[Reference Example 4]
Powdered hydrogenated styrene-poly(ethylene butylene) block-styrene block copolymer represented by the following structural formula SEBS (Septon 8004, manufactured by Kuraray Co., Ltd.: styrene content 31% by mass, average molecular weight 90,000, JIS A hardness) 80) was mixed in three kinds of lubricating base oils of mineral oil, poly-α-olefin and ester oil, and heated to 50° C. and stirred. Hydrogenated styrene-poly(ethylene butylene) ) The block-styrene block copolymer and the lubricating base oil were separated from each other, and could not be roll-treated, and none of the three types of lubricating base oils could be made into grease.
［比較例１］
増ちょう剤として、リチウム石鹸が１５質量％になるように、鉱物油、ポリαオレフィン、エステル油の３種類の潤滑油基油にそれぞれ混合し、２００℃に加熱撹拌し、冷却した後、ロール処理して３種類のグリース組成物を得た。
[Comparative Example 1]
As a thickener, three kinds of lubricating oil base oils of mineral oil, poly-α-olefin, and ester oil were mixed so that lithium soap was 15% by mass, and the mixture was heated and stirred at 200° C., cooled, and then rolled. After processing, three types of grease compositions were obtained.
［比較例２］
ウレア系増ちょう剤が１５質量％になるように、鉱物油、ポリαオレフィン、エステル油の３種類の潤滑油基油にて、それぞれ一級アミンとジイソシアネートとを反応させ、加熱分散し冷却した後、ロール処理して３種類のグリース組成物を得た。
[Comparative example 2]
After the primary amine and diisocyanate were respectively reacted with three types of lubricating base oils of mineral oil, poly-α-olefin, and ester oil so that the urea-based thickener was 15% by mass, and the mixture was heated and dispersed and cooled. Roll treatment was performed to obtain three kinds of grease compositions.
＜評価＞
ＡＳＴＭ Ｄ １８３１規格のシェルロール法により、実施例１、２、比較例１、２のグリース組成物の室温（２５℃）での不混和ちょう度の変化を測定した。
実施例１については、水を３０％混入させたときのちょう度変化についても測定した。
評価結果を表２に示す。
<Evaluation>
The change in immiscibility of the grease compositions of Examples 1 and 2 and Comparative Examples 1 and 2 at room temperature (25°C) was measured by the shell roll method of ASTM D1831 standard.
Regarding Example 1, the change in consistency when 30% of water was mixed was also measured.
The evaluation results are shown in Table 2.
本発明のグリース組成物は、１００時間後においても付着性、粘りを示していた。
また、表１から、本発明のグリース組成物は、増ちょう剤として金属石鹸などを用いたグリース組成物に比して長期に亘りちょう度変化が小さく高耐久であることから、密封潤滑部などに好適に使用できることがわかる。
The grease composition of the present invention showed adhesiveness and stickiness even after 100 hours.
Further, from Table 1, the grease composition of the present invention has a small change in consistency over a long period of time and is highly durable as compared with a grease composition using a metal soap or the like as a thickener. It can be seen that it can be suitably used for.
Claims (3)
上記増ちょう剤が、下記構造式で表されるブロック共重合体のみから成り、
上記ブロック共重合体のスチレン含有量が３５〜３６質量％であり、平均分子量が９万〜１２万であることを特徴とするグリース組成物。
The thickener is composed only of a block copolymer represented by the following structural formula,
A grease composition characterized in that the block copolymer has a styrene content of 35 to 36 mass% and an average molecular weight of 90,000 to 120,000.
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| WO2023002626A1 (en) * | 2021-07-21 | 2023-01-26 | 株式会社ジェイテクト | Grease composition |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04146996A (en) * | 1990-10-09 | 1992-05-20 | Nippon Steel Corp | Grease composition |
| JPH0711276A (en) * | 1993-06-10 | 1995-01-13 | Exxon Res & Eng Co | Grease composition having performance improved by addition of polymer |
| JP2002327188A (en) * | 2001-04-27 | 2002-11-15 | Kanto Kasei Kogyo Kk | Oil nonseparating lubricant composition |
| JP2016141763A (en) * | 2015-02-04 | 2016-08-08 | 株式会社ニッペコ | Silencing lubrication grease composition |
| WO2019017227A1 (en) * | 2017-07-21 | 2019-01-24 | 東レ・ダウコーニング株式会社 | Grease composition, slide member using same, and method for reducing low-frequency noise |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04146996A (en) * | 1990-10-09 | 1992-05-20 | Nippon Steel Corp | Grease composition |
| JPH0711276A (en) * | 1993-06-10 | 1995-01-13 | Exxon Res & Eng Co | Grease composition having performance improved by addition of polymer |
| JP2002327188A (en) * | 2001-04-27 | 2002-11-15 | Kanto Kasei Kogyo Kk | Oil nonseparating lubricant composition |
| JP2016141763A (en) * | 2015-02-04 | 2016-08-08 | 株式会社ニッペコ | Silencing lubrication grease composition |
| WO2019017227A1 (en) * | 2017-07-21 | 2019-01-24 | 東レ・ダウコーニング株式会社 | Grease composition, slide member using same, and method for reducing low-frequency noise |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023002626A1 (en) * | 2021-07-21 | 2023-01-26 | 株式会社ジェイテクト | Grease composition |
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