JP5259962B2 - Grease composition for resin lubrication and reduction device - Google Patents
Grease composition for resin lubrication and reduction device Download PDFInfo
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- JP5259962B2 JP5259962B2 JP2007045462A JP2007045462A JP5259962B2 JP 5259962 B2 JP5259962 B2 JP 5259962B2 JP 2007045462 A JP2007045462 A JP 2007045462A JP 2007045462 A JP2007045462 A JP 2007045462A JP 5259962 B2 JP5259962 B2 JP 5259962B2
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- 239000000203 mixture Substances 0.000 title claims description 52
- 239000011347 resin Substances 0.000 title claims description 50
- 229920005989 resin Polymers 0.000 title claims description 50
- 239000004519 grease Substances 0.000 title claims description 49
- 238000005461 lubrication Methods 0.000 title claims description 31
- 239000002562 thickening agent Substances 0.000 claims description 27
- 239000002199 base oil Substances 0.000 claims description 15
- 239000000654 additive Substances 0.000 claims description 12
- 239000003921 oil Substances 0.000 claims description 10
- -1 urea compound Chemical class 0.000 claims description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000004202 carbamide Substances 0.000 claims description 6
- 229920006351 engineering plastic Polymers 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- HSEMFIZWXHQJAE-UHFFFAOYSA-N hexadecanamide Chemical compound CCCCCCCCCCCCCCCC(N)=O HSEMFIZWXHQJAE-UHFFFAOYSA-N 0.000 claims description 5
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 11
- 229920013639 polyalphaolefin Polymers 0.000 description 7
- 239000000344 soap Substances 0.000 description 7
- 239000000314 lubricant Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 description 5
- 239000004677 Nylon Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- XMKLTEGSALONPH-UHFFFAOYSA-N 1,2,4,5-tetrazinane-3,6-dione Chemical compound O=C1NNC(=O)NN1 XMKLTEGSALONPH-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- SHBUUTHKGIVMJT-UHFFFAOYSA-N Hydroxystearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OO SHBUUTHKGIVMJT-UHFFFAOYSA-N 0.000 description 2
- QERUGUZGINHQSS-UHFFFAOYSA-N NC(N)=O.NC(N)=O.N=C=O Chemical compound NC(N)=O.NC(N)=O.N=C=O QERUGUZGINHQSS-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 125000003342 alkenyl group Chemical group 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- 229940072106 hydroxystearate Drugs 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- HGPXWXLYXNVULB-UHFFFAOYSA-M lithium stearate Chemical compound [Li+].CCCCCCCCCCCCCCCCCC([O-])=O HGPXWXLYXNVULB-UHFFFAOYSA-M 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002120 nanofilm Substances 0.000 description 2
- UTOPWMOLSKOLTQ-UHFFFAOYSA-N octacosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCC(O)=O UTOPWMOLSKOLTQ-UHFFFAOYSA-N 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 235000004443 Ricinus communis Nutrition 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- VJHINFRRDQUWOJ-UHFFFAOYSA-N dioctyl sebacate Chemical compound CCCCC(CC)COC(=O)CCCCCCCCC(=O)OCC(CC)CCCC VJHINFRRDQUWOJ-UHFFFAOYSA-N 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- IOQPZZOEVPZRBK-UHFFFAOYSA-N octan-1-amine Chemical compound CCCCCCCCN IOQPZZOEVPZRBK-UHFFFAOYSA-N 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000004209 oxidized polyethylene wax Substances 0.000 description 1
- 235000013873 oxidized polyethylene wax Nutrition 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Power Steering Mechanism (AREA)
- General Details Of Gearings (AREA)
- Lubricants (AREA)
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、パワーウイ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、寿命に至るというものである。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。
例えば、基油と増ちょう剤とワックス、フッ素樹脂粉末、無機微粒子および固体潤滑剤の少なくとも一種とを含有する樹脂潤滑用グリース組成物が提案されている（例えば、特許文献１）。
また、珪素化合物を含有する潤滑剤またはその潤滑剤に増ちょう剤として金属石けんおよびウレア化合物の少なくとも一種を配合した樹脂潤滑用グリース組成物が提案されている（例えば、特許文献２）。特定の合成系基油とジウレア系増ちょう剤からなる減速ギヤ用潤滑グリース組成物、またその潤滑グリース組成物に増ちょう剤として金属複合石けんまたは金属石けんを含有させることが提案されている（例えば、特許文献３）。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提案されている（例えば、特許文献４）。
しかし、これらはいずれも樹脂ギア寿命の延命化につながるだけの低い摩擦係数を示すには不十分であり、未だユーザーの満足するものは得られていないのが実情である。
Most of the breakage of the resin gear is that the resin material is softened by frictional heat and wear progresses, leading to a life. 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 typified 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.
For example, a grease composition for resin lubrication containing a base oil, a thickener, wax, fluororesin powder, inorganic fine particles and a solid lubricant has been proposed (for example, Patent Document 1).
In addition, a lubricant composition containing a silicon compound or a grease composition for resin lubrication in which at least one of a metal soap and a urea compound is blended as a thickener in the lubricant has been proposed (for example, Patent Document 2). It has been proposed that a lubricating grease composition for a reduction gear comprising a specific synthetic base oil and a diurea thickener, and that the lubricating grease composition contain a metal composite soap or a metal soap as a thickener (for example, Patent Document 3). A lubricating grease composition using Li stearate and Li hydroxy stearate as a thickener has been proposed (for example, Patent Document 4).
However, all of these are insufficient to show a low coefficient of friction that leads to a prolonged life of the resin gear, and the actual situation is that the user is not yet satisfied.
本発明の目的は、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。
An object of the present invention is to provide a grease composition for resin lubrication that exhibits a low coefficient of friction and can significantly extend the life of a resin gear.
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、添加剤としてカルボン酸アマイド系ワックスを含有する樹脂潤滑用グリース組成物。
２．カルボン酸アマイド系ワックスが下記一般式（１）で示されることを特徴とする上記１記載の樹脂潤滑用グリース組成物。
ＲＣＯＮＨ2 （１）
（式中、Ｒは炭素数１１ 〜２１のアルキル基および／またはアルケニル基を表す。）
３．増ちょう剤がウレア化合物である上記１または２記載の樹脂潤滑用グリース組成物。
４．基油が合成炭化水素油である上記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．カルボン酸アマイド系ワックスの含有量が、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．鋼と樹脂との滑り潤滑用である上記１〜５のいずれか１項記載の樹脂潤滑用グリース組成物。
７．樹脂がエンジニアリングプラスチックである上記１〜６のいずれか１項記載の樹脂潤滑用グリース組成物。
８．上記１〜７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。
９．自動車用の電動パワーステアリング用である上記８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 a carboxylic acid amide wax as an additive.
2. 2. The grease composition for resin lubrication according to 1 above, wherein the carboxylic acid amide wax is represented by the following general formula (1).
RCONH 2 (1)
(In the formula, R represents an alkyl group having 11 to 21 carbon atoms and / or an alkenyl group.)
3. 3. The grease composition for resin lubrication according to 1 or 2 above, wherein the thickener is a urea compound.
4). 4. The grease composition for resin lubrication according to any one of 1 to 3 above, wherein the base oil is a synthetic hydrocarbon oil.
5. 5. The grease composition for resin lubrication according to any one of 1 to 4 above, wherein the content of the carboxylic acid amide wax is 0.1 to 20% by mass.
6). 6. The grease composition for resin lubrication according to any one of 1 to 5 above, which is used for sliding lubrication between steel and resin.
7. 7. The grease composition for resin lubrication according to any one of 1 to 6 above, wherein the resin is an engineering plastic.
8). A speed reducer enclosing the grease composition for resin lubrication according to any one of 1 to 7 above.
9. 9. The speed reducer according to the above 8, 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、添加剤としてカルボン酸アマイド系ワックスを含有しているため、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。添加剤としてカルボン酸アマイド系ワックス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、カルボン酸アマイド系ワックスのアマイド基が金属表面に吸着し、表面に強固な分子膜を形成することにより、この分子膜が滑剤として作用し、摺動時に生じる摩擦力を低減すると考えられる。 Since the grease composition for resin lubrication of the present invention contains a carboxylic acid amide wax as an additive, it exhibits a low coefficient of friction and can greatly extend the life of resin gears and the like. The reason why the coefficient of friction is reduced by adding carboxylic acid amide wax as an additive is not clear, but the amide group of carboxylic acid amide wax adsorbs on the metal surface and forms a strong molecular film on the surface. Thus, it is considered that this molecular film acts as a lubricant and reduces the frictional force generated during sliding.
本発明のグリース組成物に添加剤として使用するカルボン酸アマイド系ワックスは、上記一般式（１）で示されるものが好ましい。式中のＲは、炭素数が１１〜２１、好ましくは１３〜１９、さらに好ましくは１５〜１７のアルキル基および／またはアルケニル基である。カルボン酸アマイド系ワックスの好ましい具体例は、パルミチン酸アマイド、ステアリン酸アマイドおよびパルミチン酸アマイドとステアリン酸アマイドの混合体である。 The carboxylic acid amide wax used as an additive in the grease composition of the present invention is preferably one represented by the above general formula (1). R in the formula is an alkyl group and / or alkenyl group having 11 to 21, preferably 13 to 19, and more preferably 15 to 17 carbon atoms. Preferred specific examples of the carboxylic acid amide wax are palmitic acid amide, stearic acid amide, and a mixture of palmitic acid amide and stearic acid amide.
本発明のグリース組成物中、カルボン酸アマイド系ワックスの添加量は、グリース組成物全体の質量に対して、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。 In the grease composition of the present invention, the amount of carboxylic acid amide wax added is preferably 0.1 to 20% by mass, more preferably 1 to 10% by mass, based on the mass of the entire grease composition. 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.
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。 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 organoclay 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 preferred.
本発明における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、グリース組成物全体の質量に対して、通常１〜３０質量％、好ましくは３〜２０質量％である。
The content of the thickener in the grease composition in 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, with respect to the mass of the entire grease composition.
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、各種樹脂材との相性（適合性）などからポリαオレフィンに代表される合成炭化水素油である。 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 poly α olefins 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 typified by polyalphaolefins because of their compatibility (compatibility) with various resin materials.
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, oily agents, Antiwear agents, 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.
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ており、ホイールの樹脂としては一般的にはポリアミド樹脂（ナイロン）が使用されているが、本発明のグリース組成物により潤滑される樹脂の種類は、特にポリアミド樹脂（ナイロン）に限定されるものではない。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、パワーウイ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。例えば、ポリアセタール樹脂、ポリアミドイミド樹脂、ポリブチレンテレフタレート樹脂、ポリエーテルエーテルケトン樹脂、ポリフェニレンサルファイド樹脂、ポリエーテルイミド樹脂などであるが、本発明のグリース組成物はそれらのエンジニアリングプラスチックに対しても有効である。 The reduction mechanism of electric power steering is composed of a steel worm gear and a resin wheel. Polyamide resin (nylon) is generally used as the resin for the wheel, but the grease composition of the present invention The type of resin to be lubricated is not particularly limited to polyamide resin (nylon). 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. For example, polyacetal resin, polyamideimide resin, polybutylene terephthalate resin, polyetheretherketone resin, polyphenylene sulfide resin, polyetherimide resin, etc., but the grease composition of the present invention is also effective for these engineering plastics. is there.
以下、実施例によって本発明をさらに詳述するが、下記実施例は本発明を制限するものではなく、本発明の趣旨を逸脱しない範囲で変更実施することはすべて本発明の技術範囲に包含される。 Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are not intended to limit the present invention, and all modifications that are made without departing from the spirit of the present invention are included in the technical scope of the present invention. The
実施例１〜９および比較例１〜７
下記の表１および表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および７は市場実績グリース（電動パワーステアリングギア用）である。
使用した増ちょう剤は以下のとおりである。
Examples 1-9 and Comparative Examples 1-7
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 Examples 6 and 7 are market performance greases (for electric power steering gears).
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。（増ちょう剤量１５％）
[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 be reacted. Thereafter, the temperature was raised to 165 ° C., and then cooled with stirring to obtain a base grease. (Thickener amount 15%)
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。（増ちょう剤量１０．０％） 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. (Thickener amount 10.0%)
［Ｌｉヒドロキシステアレート］
基油に対し、（１）ヒマシ硬化油を８０℃で完全溶解させる。別容器に（２）水酸化リチウムを８０℃の純水で完全溶解させ、（１）と（２）を加え反応させ、よく攪拌した。その後２３０℃まで昇温し、攪拌しながら１００℃以下まで冷却し、これをベースグリースとした。（増ちょう剤量１８％）
[Li hydroxystearate]
(1) Castor hydrogenated oil is completely dissolved at 80 ° C. with respect to the base oil. In a separate container, (2) lithium hydroxide was completely dissolved in pure water at 80 ° C., (1) and (2) were added and reacted, and stirred well. Thereafter, the temperature was raised to 230 ° C., cooled to 100 ° C. or lower with stirring, and used as a base grease. (Thickener amount 18%)
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。（増ちょう剤量９．０％） 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. (Thickener amount 9.0%)
［基油］
ポリαオレフィン油（ＰＡＯ）：８．０mm2/s ＠１００℃
エステル（ジ−２エチルヘキシルセバケート）：３．２ mm2/s ＠１００℃
[Base oil]
Polyalphaolefin oil (PAO): 8.0 mm 2 / s @ 100 ° C
Ester (di-2-ethylhexyl sebacate): 3.2 mm 2 / s @ 100 ° C
［酸化防止剤］
ジフェニルアミン ２．０％
[Antioxidant]
Diphenylamine 2.0%
［防錆剤］
Ｃａスルホネート ０．５％
[Rust preventive]
Ca sulfonate 0.5%
［添加剤］
Ａ…カルボン酸アマイド系ワックス
Ａ１…パルミチン酸アマイド
Ａ２…ステアリン酸アマイド
Ａ３…パルミチン酸アマイドとステアリン酸アマイドの１：１（質量比）混合物
Ｂ… モンタン酸ワックス
Ｃ… ポリエチレンワックス
Ｄ… 酸化ポリエチレンワックス
Ｅ… ポリテトラフルオロエチレン（ＰＴＦＥ）
Ｆ… ステアリン酸リチウム（Ｌｉ−ｓｔ）
Ｇ… シリコーン油
[Additive]
A ... Carboxylic acid amide wax A1 ... Palmitic acid amide A2 ... Stearic acid amide A3 ... 1: 1 (mass ratio) mixture of palmitic acid amide and stearic acid amide B ... Montanic acid wax C ... Polyethylene wax D ... Oxidized polyethylene wax E ... Polytetrafluoroethylene (PTFE)
F ... Lithium stearate (Li-st)
G ... Silicone oil
［評価試験方法］
摩擦係数μ（室温）の測定
Ｆａｌｅｘ αモデル試験（図１参照）
図１においてＰは荷重、ｎは回転数を示す。
試験概略
図１に示すリングとブロックとの組み合わせで、リング表面に試料グリースを塗布し、規定荷重で規定時間回転させたときの動摩擦係数を測定する。
試験条件
試 験 片 ： リング Ｓ−１０（ASTM指定品） （HRC 58-63，RMS 0.15-0.30μm）
ブロック ６６ナイロン（ガラス繊維２５％配合品）
回 転 数 ： ３７ｒｐｍ（リング径：35mm，周速：68mm/s）
荷 重 ： ９．８N
測定温度 ： ２５℃
試験時間 ： ５ｍｉｎ
[Evaluation test method]
Measurement of friction coefficient μ (room temperature) Falex α model test (see Fig. 1)
In FIG. 1, P represents a load, and n represents the number of rotations.
Test outline With the combination of ring and block shown in Fig. 1, the sample grease is applied to the ring surface, and the dynamic friction coefficient is measured when rotated for a specified time with a specified load.
Test condition test piece: Ring S-10 (ASTM specified product) (HRC 58-63, RMS 0.15-0.30μm)
Block 66 nylon (25% glass fiber)
Number of rotations: 37 rpm (ring diameter: 35 mm, peripheral speed: 68 mm / s)
Load: 9.8N
Measurement temperature: 25 ° C
Test time: 5 min
摩擦係数μ（室温） ○：0.050以下 △：0.050超0.053未満 ×：0.053以上
Friction coefficient μ (room temperature) ○: 0.050 or less △: More than 0.050 and less than 0.053 ×: 0.053 or more
カルボン酸アマイド系ワックスを含む実施例１〜９のグリースはすべて摩擦係数が低いのに対してこれを含まない比較例１〜７のグリースは摩擦係数が高い。 All the greases of Examples 1 to 9 containing a carboxylic acid amide wax have a low coefficient of friction, whereas the greases of Comparative Examples 1 to 7 not containing this have a high coefficient of friction.
Claims (8)
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| CN105027322B (en) * | 2013-12-25 | 2019-01-15 | 松下知识产权经营株式会社 | Electronic equipment |
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| JP5931509B2 (en) * | 2012-03-05 | 2016-06-08 | Ｊｘエネルギー株式会社 | Grease composition |
| JP5913007B2 (en) | 2012-08-31 | 2016-04-27 | Ｊｘエネルギー株式会社 | Grease composition for electric power steering apparatus and electric power steering apparatus |
| WO2018235281A1 (en) * | 2017-06-23 | 2018-12-27 | マブチモーター株式会社 | Grease |
| EP3757195A1 (en) | 2019-06-27 | 2020-12-30 | TE Connectivity Germany GmbH | Dispensable grease sealants, method for producing same, crimp connection, method for producing same, and use of the dispensable grease sealants |
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| JPS56116799A (en) * | 1980-02-20 | 1981-09-12 | Oiles Ind Co Ltd | Solid lubricating agent and its manufacture |
| JPS58154800A (en) * | 1982-03-10 | 1983-09-14 | Hitachi Ltd | Lubricant for preventing electrolytic corrosion and bearing device using same |
| EP1602710B1 (en) * | 2003-03-11 | 2016-02-03 | NSK Ltd. | Grease composition for resin lubrication and electrically operated power steering unit |
| JP2004301268A (en) * | 2003-03-31 | 2004-10-28 | Nsk Ltd | Electric power steering device |
| JP2008115304A (en) * | 2006-11-06 | 2008-05-22 | Cosmo Sekiyu Lubricants Kk | Urea grease composition for resin |
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