JP2007016168A - Grease composition for resin lubrication, and reduction gear - Google Patents

Grease composition for resin lubrication, and reduction gear Download PDF

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Publication number
JP2007016168A
JP2007016168A JP2005200500A JP2005200500A JP2007016168A JP 2007016168 A JP2007016168 A JP 2007016168A JP 2005200500 A JP2005200500 A JP 2005200500A JP 2005200500 A JP2005200500 A JP 2005200500A JP 2007016168 A JP2007016168 A JP 2007016168A
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Prior art keywords
grease composition
resin
lubrication
fatty acid
grease
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Satoshi Yamazaki
聡 山崎
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Kyodo Yushi Co Ltd
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Kyodo Yushi Co Ltd
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Priority to JP2005200500A priority Critical patent/JP2007016168A/en
Priority to PCT/JP2006/313562 priority patent/WO2007007664A1/en
Publication of JP2007016168A publication Critical patent/JP2007016168A/en
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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
    • 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
    • C10M169/02—Mixtures of base-materials and thickeners
    • 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
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
    • C10M129/40—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms monocarboxylic
    • 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
    • C10M169/06—Mixtures of thickeners 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/106—Carboxylix acids; Neutral salts thereof used as thickening agents
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C10M2207/122—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C10M2207/122—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic
    • C10M2207/1225—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic used as thickening agent
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
    • C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
    • 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
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/06—Perfluoro polymers
    • C10M2213/062—Polytetrafluoroethylene [PTFE]
    • 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
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/06—Perfluoro polymers
    • C10M2213/062—Polytetrafluoroethylene [PTFE]
    • C10M2213/0626—Polytetrafluoroethylene [PTFE] used as thickening agents
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/006—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions used as thickening agents
    • 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
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
    • 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
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/02—Groups 1 or 11
    • 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
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/04—Groups 2 or 12
    • 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
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • 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
    • C10N2030/08—Resistance to extreme temperature
    • 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
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grease composition for resin lubrication having a low friction coefficient not only at room temperature but also in a high temperature atmosphere, and capable of drastically extending a life of a resin gear or the like; and to provide a reduction gear with the grease composition. <P>SOLUTION: The grease composition for resin lubrication comprises a thickener, a base oil, and, as an additive agent, a powdery fatty acid metal soap which does not contain an OH group. The reduction gear with the grease composition is also provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、樹脂潤滑用グリース組成物に関し、特に、摩擦力の低減を目的とした樹脂潤滑用グリース組成物であって、例えば自動車用の電動パワーステアリング（ＥＰＳ）に使用するのに好適なグリース組成物、並びに該グリース組成物を封入した減速装置に関するものである。   The present invention relates to a grease composition for resin lubrication, and in particular, a grease composition for resin lubrication intended to reduce frictional force, which is suitable for use in, for example, an electric power steering (EPS) for automobiles. The present invention relates to a composition and a speed reducer in which the grease composition is enclosed.

電動パワーステアリングの減速機構は鋼製のウォームギアと樹脂製のホイールから構成される。ホイールの樹脂としては通常は、ポリアミド（ナイロン）が使用され、潤滑形態は鋼と樹脂との滑りである。このような潤滑機構部品としては他にワイパーモーター用減速機やドアロック用アクチュエーター、パワーウィンドモーター等があり樹脂材にはエンジニアリングプラスチックが使用されている。
潤滑剤にはＢａ複合石けんを増ちょう剤とし、ポリαオレフィンを基油としたグリースが使用されているが潤滑性および耐久寿命で必ずしも満足されていない。今後、自動車、電化製品、精密機器などでエンジニアリングプラスチックの使用量増加が見込まれ、これに伴い、鋼−樹脂の組み合わせによる滑り潤滑および転がり滑り潤滑が増えると予想される。 The reduction mechanism of the electric power steering is composed of a steel worm gear and a resin wheel. As the wheel resin, polyamide (nylon) is usually used, and the lubrication form is sliding between steel and resin. Other lubrication mechanism components include wiper motor speed reducers, door lock actuators, power window motors, etc., and engineering plastics are used as the resin material.
As the lubricant, a grease containing Ba composite soap as a thickener and a poly-α-olefin as a base oil is used, but it is not always satisfactory in terms of lubricity and durability. In the future, the use of engineering plastics is expected to increase in automobiles, electrical appliances, precision equipment, etc., and along with this, sliding lubrication and rolling sliding lubrication due to steel-resin combinations are expected to increase.

樹脂ギアの破損は、その殆どが摩擦熱により樹脂材が軟化して摩耗が進行し寿命に至る。特に高温雰囲気では雰囲気温度も加わるため摩擦熱による影響は非常に大きい。鋼−樹脂の組み合わせによる潤滑のメカニズムは現在のところあまり解明されておらず、鋼−鋼で代表される反応型添加剤では摩擦係数の低減効果が見られないことからＰＴＦＥ(ポリテトラフルオロエチレン)などの軟らかい樹脂系添加剤や油性剤などにより摩擦抵抗を緩和する方法が多く取られている。
特許文献１には、脂肪酸金属石けんを増ちょう剤として摩擦係数を低減させたグリース組成物の例が記載されているが、充分な低摩擦係数効果は得られていない。また、特許文献１には、ＯＨ基を含まない脂肪酸金属石けんの実施例はなく、ＯＨ基を含まない脂肪酸金属石けんを、粉末状でグリースの添加剤として使用された例は今までに報告されていない。
また特許文献２には、増ちょう剤としてＬｉステアレートとＬｉヒドロキシステアレートを併用した潤滑グリース組成物が記載されているが、両者は増ちょう剤として使用されており、粉末状の脂肪酸金属石けんを添加するという技術思想は開示されていない。 Most of the breakage of the resin gear is caused by softening of the resin material due to frictional heat, so that wear progresses and the service life is reached. In particular, the influence of frictional heat is very large because the ambient temperature is also added in a high temperature atmosphere. The mechanism of lubrication by the steel-resin combination has not been clarified so far, and the reactive additive represented by steel-steel has no effect of reducing the friction coefficient, so PTFE (polytetrafluoroethylene) Many methods have been used to relieve the frictional resistance with soft resin-based additives such as oily agents and the like.
Patent Document 1 describes an example of a grease composition using a fatty acid metal soap as a thickening agent to reduce the friction coefficient, but a sufficient low friction coefficient effect is not obtained. Patent Document 1 has no examples of fatty acid metal soaps that do not contain OH groups, and examples of fatty acid metal soaps that do not contain OH groups have been reported to date as powder additives. Not.
Patent Document 2 describes a lubricating grease composition using Li stearate and Li hydroxy stearate as thickeners, both of which are used as thickeners, and are in the form of powdered fatty acid metal soap. The technical idea of adding is not disclosed.

特開２００４−２５０４８１JP 2004-250481 特開２００２−３６３５９０JP2002-363590

従って、本発明の目的は、樹脂潤滑用グリースを提供することであり、特に、室温のみならず高温雰囲気下の中でも低い摩擦係数を示し、かつ樹脂ギア寿命を大幅に延命させることができる樹脂潤滑用グリース組成物を提供することである。
本発明の他の目的は上記グリース組成物を封入した減速装置を提供することである。 Accordingly, an object of the present invention is to provide a grease for resin lubrication, and in particular, resin lubrication that exhibits a low coefficient of friction not only at room temperature but also in a high-temperature atmosphere and that can greatly extend the life of a resin gear. A grease composition is provided.
Another object of the present invention is to provide a speed reducer enclosing the above grease composition.

本発明は以下の樹脂潤滑用グリース組成物を提供するものである。
１．増ちょう剤と基油を含み、添加剤として、粉末状のＯＨ基を含まない脂肪酸金属石けんを含有する樹脂潤滑用グリース組成物。
２．基油が合成炭化水素油である上記１記載の樹脂潤滑用グリース組成物。
３．鋼と樹脂との滑り潤滑用である上記１又は２記載の樹脂潤滑用グリース組成物。
４．樹脂がエンジニアリングプラスチックである上記1〜３のいずれか１項記載の樹脂潤滑用グリース組成物。
５．グリース組成物中のＯＨ基を含まない脂肪酸金属石けんの含有量が、０．１〜２０質量％である上記1〜４のいずれか１項記載の樹脂潤滑用グリース組成物。
６．上記１〜５のいずれか１項記載の樹脂潤滑用グリース組成物を封入した減速装置。
７．自動車用の電動パワーステアリング用である上記６記載の減速装置。 The present invention provides the following grease composition for resin lubrication.
1. A grease composition for resin lubrication comprising a thickener and a base oil, and containing, as an additive, a fatty acid metal soap containing no powdery OH group.
2. 2. The grease composition for resin lubrication according to 1 above, wherein the base oil is a synthetic hydrocarbon oil.
3. 3. The grease composition for resin lubrication according to 1 or 2 above, which is used for sliding lubrication between steel and resin.
4). 4. The grease composition for resin lubrication according to any one of 1 to 3 above, wherein the resin is an engineering plastic.
5. 5. The grease composition for resin lubrication according to any one of 1 to 4 above, wherein the content of the fatty acid metal soap not containing OH groups in the grease composition is 0.1 to 20% by mass.
6). A speed reducer in which the grease composition for resin lubrication according to any one of 1 to 5 is enclosed.
7). 7. The speed reducer according to the above 6, which is for electric power steering for automobiles.

本発明の樹脂潤滑用グリース組成物は、添加剤として粉末状のＯＨ基を含まない脂肪酸金属石けんを含有しているため、室温のみならず高温雰囲気下の中でも低い摩擦係数を示し、樹脂ギア等の寿命を大幅に延命させることができる。添加剤として粉末状のＯＨ基を含まない脂肪酸金属石けんを添加したことにより摩擦係数が低減する理由は明らかではないが、次のように推察される。
粉末状の脂肪酸金属石けん自身が表面の凝集エネルギーの小さい層状の構造となっており、このような構造の結晶に沿ってせん断を加えた場合、層間に沿って結晶が割れて滑りやすい。このため摩擦の起こっている二つの物体間に介在させることで摩擦力が低減され、潤滑効果が得られる。脂肪酸金属石けんが極性部分と無極性部分よりなる界面活性物質であることから、グリースに分散させることで金属表面に分子の吸着膜を形成する。また、脂肪酸金属石けんの粒子径が非常に小さいため潤滑部に入り込み易く、二つの物体間の直接接触による摩耗・摩擦を効果的に防止する。 The grease composition for resin lubrication of the present invention contains a fatty acid metal soap that does not contain a powdery OH group as an additive, and thus exhibits a low coefficient of friction not only at room temperature but also in a high temperature atmosphere, such as resin gears. Can greatly extend the lifespan. The reason why the friction coefficient is reduced by adding a fatty acid metal soap containing no powdery OH group as an additive is not clear, but is presumed as follows.
The powdered fatty acid metal soap itself has a layered structure with a small surface cohesive energy, and when shearing is applied along the crystal having such a structure, the crystal is easily broken and slips along the interlayer. For this reason, by interposing between two objects in which friction occurs, the frictional force is reduced and a lubricating effect is obtained. Since fatty acid metal soap is a surface active substance composed of a polar part and a nonpolar part, a molecular adsorption film is formed on the metal surface by dispersing in a grease. In addition, since the fatty acid metal soap has a very small particle size, it easily enters the lubrication part, and effectively prevents wear and friction due to direct contact between the two objects.

本発明のグリース組成物に添加剤として使用するＯＨ基を含まない脂肪酸金属石けん（以下単に「脂肪酸金属石けん」ともいう）としては、炭素原子数が好ましくは６〜２４、さらに好ましくは１２〜１８の脂肪酸の金属石けんが挙げられる。脂肪酸の好ましい具体例としてはステアリン酸、パルミチン酸等が挙げられる。
金属石けんとしては、Ｎａ、Ｋ等のアルカリ金属石けん、Ｍｇ、Ｃａ等のアルカリ土類金属石けん、Ｚｎ石けん、Ａｌ石けん、Ｌｉ石けん、等が挙げられる。
好ましいものは、ステアリン酸金属石けんであり、特にステアリン酸のＮａ，Ｍｇ，Ｚｎ又はＡｌ石けんが好ましい。
本発明に使用する脂肪酸金属石けんの粒径は、好ましくは１〜１００μｍであり、さらに好ましくは３〜２０であり、最も好ましくは１０μｍ前後である。
粒径が１００μｍを超えると潤滑部へ進入しにくくなり、良好な潤滑特性が得られにくく、また１μｍ未満にしても、効果の増大は見られない。
脂肪酸金属石けんは、グリース組成物中に分散された状態でも元の粒径、例えば、約１０μｍの粒径を維持する。また粒子径が小さいほど表面積が大きくなるため少量でも優れた効果が期待される。
本発明のグリース組成物中、脂肪酸金属石けんの添加量は、好ましくは０．１〜２０質量％、より好ましくは、１〜１０質量％である。０．１質量％未満では目的とする効果の発現が不十分であり、２０質量％を超えて添加しても効果が飽和してしまう。 The fatty acid metal soap containing no OH group used as an additive in the grease composition of the present invention (hereinafter also simply referred to as “fatty acid metal soap”) preferably has 6 to 24 carbon atoms, more preferably 12 to 18 carbon atoms. Examples include metal soaps of fatty acids. Preferable specific examples of the fatty acid include stearic acid and palmitic acid.
Examples of the metal soap include alkali metal soaps such as Na and K, alkaline earth metal soaps such as Mg and Ca, Zn soap, Al soap, Li soap and the like.
Preference is given to metal stearate soaps, in particular Na, Mg, Zn or Al soaps of stearic acid.
The particle size of the fatty acid metal soap used in the present invention is preferably 1 to 100 μm, more preferably 3 to 20, and most preferably around 10 μm.
When the particle size exceeds 100 μm, it becomes difficult to enter the lubrication part, and it is difficult to obtain good lubrication characteristics.
The fatty acid metal soap maintains its original particle size, for example, a particle size of about 10 μm, even when dispersed in the grease composition. Moreover, since the surface area increases as the particle diameter decreases, an excellent effect is expected even with a small amount.
In the grease composition of the present invention, the amount of fatty acid metal soap added is preferably 0.1 to 20% by mass, more preferably 1 to 10% by mass. If the amount is less than 0.1% by mass, the desired effect is not sufficiently exhibited, and even if the amount exceeds 20% by mass, the effect is saturated.

脂肪酸金属石けんの特性はその潤滑性の他に、離形性、ゲル化性や撥水性、界面活性性などがある。脂肪酸金属石けんは各々の分野で広く使用され、プラスチック用滑剤、顔料分散剤、ゴム加硫促進剤、粉末冶金、鋳物、塗料、医薬品などの用途があげられる。
グリースの増ちょう剤としては既にステアリン酸金属石けんが使用されているが、これはグリース基油中でステアリン酸と金属化合物を反応させて製造するものであり、あらかじめ製造した粉末状の脂肪酸金属石けんをグリースの添加剤として更に添加して使用した例は今まで報告されていない。また、樹脂潤滑用として使用された例もなく、低い摩擦係数を示したという報告は皆無である。 The characteristics of fatty acid metal soaps include releasability, gelation, water repellency, and surface activity in addition to its lubricity. Fatty acid metal soaps are widely used in various fields, and include applications such as plastic lubricants, pigment dispersants, rubber vulcanization accelerators, powder metallurgy, castings, paints, and pharmaceuticals.
As a thickener for grease, metal stearate soap has already been used. This is produced by reacting stearic acid with a metal compound in a grease base oil. There has been no report on an example in which is added as a grease additive. Moreover, there is no example which was used for resin lubrication, and there was no report which showed the low friction coefficient.

本発明のグリース組成物に使用される増ちょう剤は、特に限定されず、全ての増ちょう剤が使用可能である。例えば、Li石けんや複合Li石けんに代表される石けん系増ちょう剤、ジウレアに代表されるウレア系増ちょう剤、有機化クレイやシリカに代表される無機系増ちょう剤、ＰＴＦＥに代表される有機系増ちょう剤などが挙げられる。ウレア化合物は高温に耐え得る増ちょう剤であり、高温・高負荷条件で要求される用途にはウレア系グリースの使用が好ましく、本発明においても、特に好ましいのはウレア系増ちょう剤である。
本発明のグリース組成物中の増ちょう剤の含有量は、増ちょう剤の種類により異なる。本発明のグリース組成物のちょう度は、２３５〜４１５が好適であり、増ちょう剤の含有量はこのちょう度を得るのに必要な量となる。本発明のグリース組成物中、増ちょう剤の含有量は、通常１〜３０質量％、好ましくは３〜２０質量％である。 The thickener used in the grease composition of the present invention is not particularly limited, and all thickeners can be used. For example, soap thickeners represented by Li soap and composite Li soap, urea thickeners represented by diurea, inorganic thickeners represented by organic clay and silica, and organic materials represented by PTFE. And system thickeners. Urea compounds are thickeners that can withstand high temperatures, and urea-based greases are preferably used for applications required under high-temperature and high-load conditions. In the present invention, urea-based thickeners are particularly preferable.
The content of the thickener in the grease composition of the present invention varies depending on the type of the thickener. The consistency of the grease composition of the present invention is preferably 235 to 415, and the content of the thickener is an amount necessary to obtain this consistency. In the grease composition of the present invention, the content of the thickener is usually 1 to 30% by mass, preferably 3 to 20% by mass.

本発明のグリース組成物に使用される基油も特に限定されず、鉱油を始めとした全ての基油が使用可能である。その他、ジエステル，ポリオールエステルに代表されるエステル系合成油、ポリαオレフィン，ポリブテンに代表される合成炭化水素油、アルキルジフェニルエーテル、ポリプロピレングリコールに代表されるエーテル系合成油、シリコーン油、フッ素化油など各種合成油が使用可能である。特に好ましいものは合成炭化水素油（ポリαオレフィン）である。   The base oil used in the grease composition of the present invention is not particularly limited, and all base oils including mineral oil can be used. In addition, ester synthetic oils typified by diesters and polyol esters, synthetic hydrocarbon oils typified by polyalphaolefins and polybutenes, alkyl diphenyl ethers, ether synthetic oils typified by polypropylene glycol, silicone oils, fluorinated oils, etc. Various synthetic oils can be used. Particularly preferred are synthetic hydrocarbon oils (polyalphaolefins).

本発明のグリース組成物には、必要に応じて通常のグリース組成物に汎用されている全ての添加剤が使用可能であり、例えば、酸化防止剤、錆止め剤、金属腐食防止剤、油性剤耐摩耗剤、極圧剤、固体潤滑剤などを添加することができる。
本発明のグリース組成物は、上記各成分及びその他の添加剤を所望の配合割合で混合することにより容易に製造することができる。 In the grease composition of the present invention, all additives that are widely used in ordinary grease compositions can be used as necessary. For example, antioxidants, rust inhibitors, metal corrosion inhibitors, oil resistance agents Abrasives, extreme pressure agents, solid lubricants and the like can be added.
The grease composition of the present invention can be easily produced by mixing the above components and other additives in a desired blending ratio.

実施例１〜６及び比較例１〜６
下記の表１及び表２に示す処方のグリース組成物を以下に示すように調製し、ちょう度及び摩擦係数を測定した。比較例６は市販グリースである。
使用した増ちょう剤は以下のとおりである。 Examples 1-6 and Comparative Examples 1-6
The grease compositions having the formulations shown in Table 1 and Table 2 below were prepared as shown below, and the consistency and friction coefficient were measured. Comparative Example 6 is a commercially available grease.
The thickeners used are as follows.

ジウレア
イソシアネート（ＭＤＩ）５７．５ｇを基油（ＰＡＯ）４２５ｇに混合して８０℃で完全溶解させた。別容器にアミン９２．５ｇ（オクチルアミンとオクタデシルアミンをモル比５：５で混合）を基油（ＰＡＯ）４２５ｇに混合して８０℃で完全溶解させたのち、イソシアネート／基油溶解物と８０℃で１時間攪拌し、反応させた。その後１６５℃まで昇温した後、攪拌しながら冷却したものをベースグリースとした。
Ｌｉヒドロキシステアレート
プレフォームされたＬｉヒドロキシステアレート１５０ｇに基油（ＰＡＯ）８５０ｇを混合して２３０℃まで昇温して完全溶解させた。その後、攪拌しながら冷却したものをベースグリースとした。
各ベースグリースに実施例、比較例に示す配合で添加剤および基油を加えて三本ロールミルでちょう度No.２グレードに調整した。
基油（ＰＡＯ) ：ポリαオレフィン油（８．０mm2/s ＠１００℃）
酸化防止剤 ：ジフェニールアミン
防錆剤 ：Ｃａスルフォネート
添加剤
Ａ：Ｍｇステアレート（粒径１５μｍ）
Ｂ：Ｎａステアレート（粒径２０μｍ）
Ｃ：Ｌｉステアレート（粒径３μｍ）
Ｄ：Ｍｇヒドロキシステアレート（粒径１５μｍ）
Ｅ：Ｌｉヒドロキシステアレート（粒径３μｍ）
Ｆ：ＰＴＦＥ（粒径０．２μｍ）
Ｇ：ＺｎＤＴＰ（液体） Diurea
Isocyanate (MDI) 57.5 g was mixed with base oil (PAO) 425 g and completely dissolved at 80 ° C. In a separate container, 92.5 g of amine (octylamine and octadecylamine mixed at a molar ratio of 5: 5) was mixed with 425 g of base oil (PAO) and completely dissolved at 80 ° C. The mixture was stirred at 1 ° C. for 1 hour to react. Thereafter, the temperature was raised to 165 ° C., and then cooled with stirring to obtain a base grease.
Li hydroxy stearate 850 g of base oil (PAO) was mixed with 150 g of preformed Li hydroxy stearate and heated to 230 ° C. to be completely dissolved. Then, the base grease was cooled with stirring.
Additives and base oils were added to each base grease in the formulations shown in the Examples and Comparative Examples, and adjusted to a consistency No. 2 grade with a three-roll mill.
Base oil (PAO): Poly α-olefin oil (8.0 mm 2 / s @ 100 ° C)
Antioxidant: Diphenylamine rust inhibitor: Ca sulfonate additive A: Mg stearate (particle size 15 μm)
B: Na stearate (particle size 20 μm)
C: Li stearate (particle size 3 μm)
D: Mg hydroxystearate (particle size 15 μm)
E: Li hydroxy stearate (particle size 3 μm)
F: PTFE (particle size 0.2 μm)
G: ZnDTP (liquid)

評価試験方法
バウデン試験
水平に配置したプレート（Ｓ４５Ｃ）上に試料グリース（１ｇ）を塗布し、プレートに対してピン（ＭＣナイロン製φ５．０の円柱）を垂直に接触させ、ピンに荷重をかけてプレートを水平方向に摺動させたときにピンにかかる抵抗力（摩擦力）を測定する。
試験条件
摺動速度 ：１mm／ｓ
摺動距離 ：１５mm
荷重 ：１０Ｎ（※面圧 ０．５MPa)
測定温度 ：６０℃
繰り返し数：ｎ＝２ Evaluation Test Method Bowden Test Apply sample grease (1 g) on a horizontally placed plate (S45C), bring a pin (MC nylon φ5.0 cylinder) into contact with the plate vertically, and apply a load to the pin. Measure the resistance (friction) applied to the pins when the plate is slid horizontally.
Test conditions Sliding speed: 1mm / s
Sliding distance: 15mm
Load: 10N (* Surface pressure 0.5MPa)
Measurement temperature: 60 ° C
Number of repetitions: n = 2

Figure 2007016168
Figure 2007016168

Figure 2007016168
Figure 2007016168

粉末状のＯＨ基を含まない脂肪酸金属石けんを含有する本発明の実施例１〜６の樹脂潤滑用グリース組成物は摩擦係数が０．０３〜０．０４と低い。これに対して粉末状のＯＨ基を含まない脂肪酸金属石けんを含有しない比較例１のグリース組成物の摩擦係数は０．１８と高い。また、ＯＨ基を含む脂肪酸金属石けんを含有する比較例２及び３のグリース組成物の摩擦係数は０．０９であり、ＰＴＦＥを含有する比較例４、ＺｎＤＴＰを含有する比較例５及び市販品である比較例６のグリース組成物の摩擦係数は０．１４〜０．１６と高い。
上記結果は、粉末状のＯＨ基を含まない脂肪酸金属石けんを含有させることにより、樹脂潤滑用グリース組成物の摩擦係数を顕著に低減しうることを示している。 The grease composition for resin lubrication of Examples 1 to 6 of the present invention containing a fatty acid metal soap containing no powdery OH group has a low friction coefficient of 0.03 to 0.04. On the other hand, the friction coefficient of the grease composition of Comparative Example 1 that does not contain the powdered OH group-free fatty acid metal soap is as high as 0.18. Moreover, the friction coefficients of the grease compositions of Comparative Examples 2 and 3 containing fatty acid metal soaps containing OH groups are 0.09, Comparative Example 4 containing PTFE, Comparative Example 5 containing ZnDTP, and a commercial product. The friction coefficient of a certain grease composition of Comparative Example 6 is as high as 0.14 to 0.16.
The above results show that the coefficient of friction of the grease composition for resin lubrication can be remarkably reduced by including a fatty acid metal soap containing no powdery OH group.

Claims (7)

増ちょう剤と基油を含み、添加剤として、粉末状のＯＨ基を含まない脂肪酸金属石けんを含有する樹脂潤滑用グリース組成物。   A grease composition for resin lubrication comprising a thickener and a base oil, and containing, as an additive, a fatty acid metal soap not containing powdery OH groups. 基油が合成炭化水素油である請求項１記載の樹脂潤滑用グリース組成物。   The grease composition for resin lubrication according to claim 1, wherein the base oil is a synthetic hydrocarbon oil. 鋼と樹脂との滑り潤滑用である請求項１又は２記載の樹脂潤滑用グリース組成物。   The grease composition for resin lubrication according to claim 1 or 2, which is used for sliding lubrication between steel and resin. 樹脂がエンジニアリングプラスチックである請求項1〜３のいずれか１項記載の樹脂潤滑用グリース組成物。   The resin composition grease composition according to any one of claims 1 to 3, wherein the resin is an engineering plastic. グリース組成物中のＯＨ基を含まない脂肪酸金属石けんの含有量が、０．１〜２０質量％である請求項1〜４のいずれか１項記載の樹脂潤滑用グリース組成物。   The grease composition for resin lubrication according to any one of claims 1 to 4, wherein the content of the fatty acid metal soap not containing OH groups in the grease composition is 0.1 to 20% by mass. 請求項１〜５のいずれか１項記載の樹脂潤滑用グリース組成物を封入した減速装置。   A speed reducer in which the grease composition for resin lubrication according to any one of claims 1 to 5 is enclosed. 自動車用の電動パワーステアリング用である請求項６記載の減速装置。   The speed reducer according to claim 6, which is used for an electric power steering for an automobile.
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JP2010037529A (en) * 2008-07-07 2010-02-18 Showa Shell Sekiyu Kk Grease composition for use in resin lubrication
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