WO2011016580A1 - 等速ジョイント用グリース組成物及び等速ジョイント - Google Patents
等速ジョイント用グリース組成物及び等速ジョイント Download PDFInfo
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- WO2011016580A1 WO2011016580A1 PCT/JP2010/063453 JP2010063453W WO2011016580A1 WO 2011016580 A1 WO2011016580 A1 WO 2011016580A1 JP 2010063453 W JP2010063453 W JP 2010063453W WO 2011016580 A1 WO2011016580 A1 WO 2011016580A1
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- constant velocity
- grease composition
- velocity joint
- mass
- palm
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Classifications
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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
-
- 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
- C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
- C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
-
- 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
- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
-
- 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
- C10M2207/28—Esters
- C10M2207/287—Partial esters
- C10M2207/289—Partial esters containing free hydroxy groups
-
- 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
- C10M2207/40—Fatty vegetable or animal oils
-
- 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
- C10M2215/10—Amides of carbonic or haloformic acids
- C10M2215/102—Ureas; Semicarbazides; Allophanates
- C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
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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
- 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
- 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
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- 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
- C10N2030/76—Reduction of noise, shudder, or vibrations
-
- 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
- C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
- C10N2040/046—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for traction drives
-
- 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
Definitions
- the present invention relates to a grease composition for a constant velocity joint (CVJ) and a constant velocity joint in which the grease composition is enclosed.
- An extremely high surface pressure is generated in the constant velocity joint portion to be lubricated, and the joint portion is subjected to a complicated rolling and sliding action. For this reason, abnormal vibrations often occur.
- the present invention relates to a grease composition for a constant velocity joint that can efficiently lubricate such a constant velocity joint and effectively reduce friction to prevent vibrations.
- Lubricating greases used in such constant velocity joints include greases using calcium complex soap as a thickener and lithium soaps as a thickener, such as sulfurized fats and oils, tricresyl phosphate, and zinc dithiophosphate. And a grease containing a sulfur-phosphorus extreme pressure agent selected from the group consisting of:
- FF type four-wheel drive
- CO 2 reduction environmental measures
- CVJ fast joints
- plunging type constant velocity joints especially tripod type constant velocity joints (TJ), double offset type constant velocity joints (DOJ), etc., have a complicated rolling sliding motion at an angle.
- urea-based thickeners for this reason, urea-based thickeners, molybdenum disulfide, and calcium oxide oxide wax, calcium salt of petroleum sulfonic acid, calcium salt of alkyl aromatic sulfonic acid, calcium salt of salicylate, calcium salt of phenate, excess of oxidized wax.
- Patent Document 1 Selected from the group consisting of basic calcium salt, petroleum sulfonic acid overbased calcium salt, alkyl aromatic sulfonic acid overbased calcium salt, salicylate overbased calcium salt, and phenate overbased calcium salt
- Patent Document 2 Selected from the group consisting of basic calcium salt, petroleum sulfonic acid overbased calcium salt, alkyl aromatic sulfonic acid overbased calcium salt, salicylate overbased calcium salt, and phenate overbased calcium salt
- Patent Document 2 A grease composition
- an object of the present invention is to provide a grease composition for a constant velocity joint, in particular, a grease composition for a constant velocity joint that can efficiently lubricate the constant velocity joint, effectively reduce friction and prevent vibrations, and the like. It is to provide a constant velocity joint encapsulating.
- the present inventors have conducted various researches and developments on grease compositions that reduce the friction of constant velocity joints and prevent vibrations, and evaluate the performance of greases used for stool under lubrication conditions where vibrations are likely to occur.
- An SRV tester known as a tester was used.
- the vibration with constant velocity joint as the vibration source
- the friction coefficient measured by SRV test machine under specific vibration conditions.
- the present inventors examined the above relationship by using urea grease as the base grease and various combinations of oil-based agents and various extreme pressure agents.
- At least one oily agent selected from the group consisting of base oils, urea thickeners, palm olein, palm stearin and glycerin monooleate, molybdenum dialkyldithiocarbamate sulfur, zinc sulfonate and sulfur-phosphorus extreme pressure It was found that the grease composition containing the agent exhibits desirable lubrication characteristics with a low coefficient of friction, and even in a forced force test using an actual constant velocity joint, unlike conventional constant velocity joint grease, vibration As a result, it was confirmed that the occurrence of water vapor can be remarkably prevented, and the present invention has been completed.
- the grease composition for constant velocity joints according to 1 above wherein the iodine value of palm stearin is 48 or less and the rising melting point is 44 ° C. or more. 5.
- the content of each component in the entire composition is (A) 49.0 to 98.65% by mass of base oil, (B) 1.0 to 25.0% by mass of a diurea thickener; (C) 0.1 to 5.0% by mass of an oily agent, (D) Molybdenum dialkyldithiocarbamate 0.1 to 5.0% by mass, (E) Zinc sulfonate 0.1 to 15.0% by mass, and (f) Sulfur-phosphorus extreme pressure additive 0.05 to 1.0% by mass
- the grease composition for a constant velocity joint of the present invention can efficiently lubricate the constant velocity joint, effectively reduce friction, and remarkably prevent the occurrence of vibration. In addition, it has superior joint flaking resistance compared to conventional grease compositions for constant velocity joints.
- the grease composition of the present invention contains the following components (a), (b), (c), (d), (e), and (f).
- (D) molybdenum disulfide dialkyldithiocarbamate represented by the following formula: (R 3 R 4 N-CS -S) 2 -Mo 2 O m S n (Wherein R 3 and R 4 independently represent an alkyl group having 1 to 24 carbon atoms, m is 0 to 3, n is 4 to 1, and m + n 4).
- Examples of the base oil of the component (a) include commonly used lubricating oils such as mineral oils, ether-based synthetic oils, ester-based synthetic oils and hydrocarbon-based synthetic oils, or mixed oils thereof. It is not limited to. From the viewpoint of cost, it is preferable to use a mineral oil, and it is preferable to use a base oil in which a mineral oil is a main component and a synthetic oil is mixed.
- the kinematic viscosity of the base oil at 100 ° C. is preferably 5 to 30 mm 2 / s, more preferably 7 to 20 mm 2 / s.
- any of the diurea thickeners of component (b) can be used.
- R 1 -NH-CO-NH-C 6 H 4 -p-CH 2 -C 6 H 4 -p-NH-CO-NHR 2 R 1 and R 2 are each independently an alkyl group having 8 to 18 carbon atoms.
- the diurea thickener is obtained by reacting diphenylmethane diisocyanate with an alkylamine having 8 to 18 carbon atoms, such as octylamine, dodecylamine, hexadecylamine, octadecylamine and the like.
- diphenylmethane diisocyanate with an alkylamine having 8 to 18 carbon atoms, such as octylamine, dodecylamine, hexadecylamine, octadecylamine and the like.
- the oily agent as the component (c) is at least one selected from the group consisting of palm olein, palm stearin and glycerin monooleate. Palm olein and palm stearin are particularly preferable. Palm olein (palm olein) and palm stearin (palm stearin) are generally obtained by separating oils and fats obtained by pressing from oil palm pulp (oils and fats content 16 to 20%) and dividing them into oils and fats having the necessary properties. It is a fractionated oil and is effective for lubrication. Palm fractionated oils include palm olein in the low melting fraction and palm stearin in the high melting fraction.
- palm olein has an acid value of 0.20 or less, moisture impurities of 0.1% or less, iodine value of 56 to 72, rising melting point of 24 ° C. or less, and palm stearin has an acid value of 0.20 or less,
- the moisture content is 0.10% or less
- the iodine value is 48 or less
- the rising melting point is 44 ° C. or more
- Palm olein is clear at 40 ° C.
- palm stearin is clear at 60 ° C.
- the palm olein used in the grease composition of the present invention preferably has an iodine value of 56 to 72 and an increasing melting point of 24 ° C.
- the palm stearin used in the grease composition of the present invention preferably has an iodine value of 48 or less and an ascending melting point of 44 ° C or more, more preferably an iodine value of 22 to 48 and an ascending melting point of 44 to 56 ° C. Is.
- the base number of the zinc sulfonate as the component (e) is preferably 50 mgKOH / g or less, more preferably 40 mgKOH / g or less, for example, a zinc salt of dinonylnaphthalenesulfonic acid having a base number of 50 mgKOH / g or less.
- These zinc salts are obtained by sulfonation of aromatic hydrocarbon components in the lubricating oil fraction, which are known as metallic detergents and rust inhibitors used in lubricating oils such as engine oils.
- the component (f) is preferably a sulfur-phosphorus extreme pressure agent having a sulfur content of 15 to 35% by weight and a phosphorus content of 0.5 to 3% by mass, and the ratio of the sulfur component to the phosphorus component is adjusted. By doing so, excellent wear prevention performance and anti-seizure performance can be exhibited. If the sulfur component is more than the above range, the joint is easily corroded, and if the phosphorus component is more than the above range, it is difficult to obtain the joint wear prevention effect. Moreover, when both are less than the said range, it will become difficult to fully exhibit the target wear prevention performance and image sticking prevention performance.
- the content of the base oil of component (a) is preferably 49.0 to 98.65% by mass with respect to the total mass of the grease composition for constant velocity joints,
- the content of the diurea thickener as component (b) is preferably 1.0-25.0% by mass, more preferably 5.0-15.0% by mass, (c) palm olein, palm stearin and glycerin.
- the content of at least one oily agent selected from the group consisting of monooleate is preferably 0.1 to 5.0% by mass, more preferably 0.5 to 5.0% by mass
- the content of molybdenum sulfide dialkyldithiocarbamate is preferably 0.1 to 5.0% by mass, more preferably 0.5 to 5.0% by mass
- the content of component (e) zinc sulfonate is preferably 0.1 ⁇ 5.0% by mass, more preferably 1.0-13.0% by mass
- the content of component (f) sulfur-phosphorus extreme pressure agent is preferably 0.05-1.0% by mass, more preferably Is 0.1 to 1.0 mass%.
- the content of the diurea thickener as the component (b) is less than 1.0% by mass, the thickening effect is small and it becomes difficult to form a grease.
- the content exceeds 25.0% by mass the resulting composition is obtained. Is too hard, and the desired effect may not be obtained.
- the content of the oily agent as the component (c) is less than 0.1% by mass, it is difficult to obtain the desired effect, and even if the content exceeds 5.0% by mass, the effect is increased. Since it may not be, it is preferable to be within the above range.
- the content of molybdenum sulfide dialkyldithiocarbamate as the component (d) is less than 0.1% by mass, it becomes difficult to obtain the desired effect, and even if the content exceeds 5.0% by mass, the effect is achieved. Since there is a case where there is no increase in the thickness, it is preferable to be within the above range.
- the content of zinc sulfonate as the component (e) is less than 0.1% by mass, it is difficult to obtain the desired effect, and even if the content exceeds 15.0% by mass, the effect is increased. Therefore, it is preferable to be within the above range.
- the content of the sulfur-phosphorus extreme pressure agent as the component (f) is less than 0.05% by mass, it becomes difficult to obtain the desired effect, and the content exceeds 1.0% by mass. Since there is a case where the effect does not increase, it is preferable to be within the above range.
- the grease composition for constant velocity joints of the present invention further includes antioxidants, rust inhibitors and polymer additives generally used in various lubricating oils and greases. Can be added.
- additives such as extreme pressure agents, friction modifiers, antiwear agents and solid lubricants can be added.
- the content thereof is preferably 0.1 to 10.0% by mass in the total mass of the grease composition for constant velocity joints.
- Example 1 440 g of base oil and 58.9 g of diphenylmethane-4,4′-diisocyanate were placed in a container, and the mixture was heated to 70-80 ° C. In a separate container, 440 g of base oil and 61.1 g of octylamine were taken, heated to 70-80 ° C., added to the previous container, and allowed to react for 30 minutes with good stirring. Thereafter, the temperature was raised to 160 ° C. while stirring, and after cooling, a base aliphatic amine diurea grease was obtained.
- Tables 1 and 2 show Examples 1 to 13 and Tables 3 to 5 show Comparative Examples 1 to 24.
- Greases of Comparative Examples 1 to 23 were prepared in the same manner as in Examples 1 to 13, except that each component (c), component (d), component (e) and component (f) were not added.
- Comparative Example 24 is a commercially available urea grease containing MoDTC.
- surface is as follows, and the number in a table
- MoDTC moddenum dialkyldithiocarbamate
- SakuraLube 600 Asahi Denka Kogyo Co., Ltd.
- Palm olein 100% palm olein, iodine value 66-70, rising melting point 13 ° C or less
- Palm stearin 100% palm stearin, iodine value 22-48, rising melting point 44-56 ° C
- Zinc sulfonate zinc dinonylnaphthalene sulfonate (base number 50 mgKOH / g or less)
- Sulfur-phosphorus extreme pressure additive Brand name: Lubrizol 810 (manufactured by Nippon Lubrizol)
- the grease compositions of Examples 1 to 13 of the present invention containing the components (c) to (f) are the grease compositions of Comparative Examples 1 to 20 that do not contain any of the components (c) to (f). It can be seen that, compared with the commercial product of Comparative Example 21, a remarkable friction coefficient reduction effect and vibration generation prevention effect are exhibited.
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Abstract
Description
最近の自動車工業においては、車両の環境対策(CO2削減)を目的とした軽量化かつ居住空間の確保の点から、4輪駆動(FFタイプ)車が急激に増加し、これに不可欠な等速ジョイント(CVJ)が広く用いられている。このCVJの中で、プランジング型等速ジョイント、特にトリポート型等速ジョイント(TJ)、ダブルオフセット型等速ジョイント(DOJ)等は、ある角度の付いた状態で、回転時に複雑なころがりすべり運動を行うため、軸方向にスライド抵抗を生じ、これがアイドリング時の振動、発進及び加速時の車体の横揺れ、特定速度での車内でのビート音、又はこもり音の起振源となっている。この問題の解決のため、種々の等速ジョイント(CVJ)自体の構造の改良もなされているが、ジョイントの占めるスペース、重さ、及びコスト面でその改良は難しく、振動低減性能に優れたグリースが要求されている。
また、基油、ジウレア系増ちょう剤、二硫化モリブデン、硫化ジアルキルジチオカルバミン酸モリブデン、石油スルホン酸のカルシウム塩、硫黄-リン系極圧剤、及び植物性油脂を含有する等速ジョイント用組成物も提案されている(特許文献3)。
しかし、従来の等速ジョイント用グリース組成物は、その摩擦係数低減効果及び振動発生防止効果は必ずしも十分とはいえない。
1.下記の成分を含有する等速ジョイント用グリース組成物。
(a)基油、
(b)ジウレア系増ちょう剤、
(c)パームオレイン、パームステアリン及びグリセリンモノオレエートからなる群から選ばれる少なくとも1種の油性剤、
(d)次式で表される硫化ジアルキルジチオカルバミン酸モリブデン、
(R3R4N-CS-S)2-Mo2OmSn
(式中、R3及びR4は独立して、炭素数1~24のアルキル基を表し、mは0~3、nは4~1であり、m+n=4である。)
(e)亜鉛スルホネート、及び
(f)硫黄-リン系極圧添加剤。
2.ジウレア系増ちょう剤が次式で表されるジウレア系増ちょう剤であることを特徴とする上記1記載の等速ジョイント用グリース組成物。
R1-NH-CO-NH-C6H4-p-CH2-C6H4-p-NH-CO-NHR2
(R1及びR2は独立して、炭素原子数8~18のアルキル基である。)
3.パームオレインの沃素価が56~72及び上昇融点が24℃以下であることを特徴とする上記1記載の等速ジョイント用グリース組成物。
4.パームステアリンの沃素価が48以下及び上昇融点が44℃以上であることを特徴とする上記1記載の等速ジョイント用グリース組成物。
5.全組成物中における各成分の含有量が、
(a)基油49.0~98.65質量%、
(b)ジウレア系増ちょう剤1.0~25.0質量%、
(c)油性剤0.1~5.0質量%、
(d)硫化ジアルキルジチオカルバミン酸モリブデン0.1~5.0質量%、
(e)亜鉛スルホネート0.1~15.0質量%、及び
(f)硫黄-リン系極圧添加剤0.05~1.0質量%
である上記1又は2記載の等速ジョイント用グリース組成物。
6.プランジング型等速ジョイント用である上記1~5のいずれか1項記載の等速ジョイント用グリース組成物。
7.上記1~6のいずれか1項記載の等速ジョイント用グリース組成物を封入した等速ジョイント。
本発明のグリース組成物は、下記成分(a)、(b)、(c)、(d)、(e)、及び(f)を含有する。
(a)基油、
(b)ジウレア系増ちょう剤、
(c)パームオレイン、パームステアリン及びグリセリンモノオレエートからなる群から選ばれる少なくとも1種の油性剤、
(d)次式で表される硫化ジアルキルジチオカルバミン酸モリブデン、
(R3R4N-CS-S)2-Mo2OmSn
(式中、R3及びR4は独立して、炭素数1~24のアルキル基を表し、mは0~3、nは4~1であり、m+n=4である。)
(e)亜鉛スルホネート、及び
(f)硫黄-リン系極圧剤
上記基油の100℃における動粘度は、好ましくは5~30mm2/sであり、より好ましくは7~20mm2/sである。5mm2/s未満では、等速ジョイント(CVJ)内で油膜を形成せず高速耐久性が不充分となる傾向があり、30mm2/sを超えるとCVJ内の発熱のため高速耐久性が低下する傾向がある。
R1-NH-CO-NH-C6H4-p-CH2-C6H4-p-NH-CO-NHR2
(R1及びR2は独立して、炭素原子数8~18のアルキル基である。)
上記ジウレア系増ちょう剤は、ジフェニルメタンジイソシアネートと炭素数8~18のアルキルアミン、例えば、オクチルアミン、ドデシルアミン、ヘキサデシルアミン、オクタデシルアミン等との反応により得られる。上記ジイソシアネートとアミンとを反応させる方法には特に制限はなく、従来公知の方法により実施することができる。
パーム分別油には、低融点画分のパームオレインと高融点画分のパームステアリンがある。JAS規格では、パームオレインは酸価0.20以下、水分夾雑物0.1%以下、ヨウ素価56~72、上昇融点24℃以下等となっており、パームステアリンは酸価0.20以下、水分夾雑物0.10%以下、ヨウ素価48以下、上昇融点44℃以上等となっている。また、パームオレインは40℃で清澄なもの、パームステアリンは60℃で清澄なものとなっている。
本発明のグリース組成物に使用するパームオレインは、好ましくは、ヨウ素価が56~72及び上昇融点が24℃以下のものであり、さらに好ましくはヨウ素価が60~72及び上昇融点が20℃以下、最も好ましくはヨウ素価が65~70及び上昇融点が13℃以下のものである。
本発明のグリース組成物に使用するパームステアリンは、好ましくはヨウ素価が48以下及び上昇融点が44℃以上のものであり、さらに好ましくはヨウ素価が22~48及び上昇融点が44~56℃のものである。
(R3R4N-CS-S)2-Mo2OmSn
(式中、R3及びR4は独立して、炭素数1~24のアルキル基を表し、mは0~3、nは4~1であり、m+n=4である。)
R3及びR4は、独立して、炭素数1~24、好ましくは炭素数2~18のアルキル基である。
上記(e)成分の亜鉛スルホネートの塩基価は、好ましくは50mgKOH/g以下、さらに好ましくは40mgKOH/g以下であり、例えば、塩基価50mgKOH/g以下のジノニルナフタレンスルホン酸の亜鉛塩が挙げられる。これらの亜鉛塩は、エンジン油等の潤滑油に用いられる金属系清浄分散剤や防錆剤として知られている、潤滑油留分中の芳香族炭化水素成分のスルホン化によって得られる。
上記(c)成分の油性剤の含有量が0.1質量%未満であると、所期の効果を得ることが困難になり、5.0質量%を越えて含有させても効果の増大がない場合があるので、上記範囲内とすることが好ましい。
上記(d)成分の硫化ジアルキルジチオカルバミン酸モリブデンの含有量が0.1質量%未満であると、所期の効果を得ることが困難になり、5.0質量%を越えて含有させても効果の増大がない場合があるので、上記範囲内とすることが好ましい。
上記(e)成分のスルホン酸亜鉛の含有量が0.1質量%未満であると、所期の効果を得ることが困難になり、15.0質量%を越えて含有させても効果の増大がない場合があるので、上記範囲内とすることが好ましい。
上記(f)成分の硫黄-リン系極圧剤の含有量が0.05質量%未満であると、所期の効果を得ることが困難になり、1.0質量%を越えて含有させても効果の増大がない場合があるので、上記範囲内とすることが好ましい。
実施例1
容器に基油440gとジフェニルメタン-4,4′-ジイソシアネート58.9gをとり、混合物を70~80℃に加熱した。別容器に基油440gとオクチルアミン61.1gをとり、70~80℃に加熱後、先の容器に加え、よく攪拌しながら、30分間反応させた。その後攪拌しながら、160℃まで昇温し、放冷後、ベース脂肪族アミンジウレアグリースを得た。このベースグリースに、表1に示す配合で、添加剤を添加し、適宜基油を加え、得られる混合物を三段ロールミルにて、ちょう度No. 1 グレードに調整した。
グリースの基油として、以下の特性を有する鉱油を使用した。
粘度 40℃ 157 mm2/s
100℃ 14 mm2/s
粘度指数 88
実施例1~13において、各々の成分(c)、成分(d)、成分(e)、成分(f)を添加しなかった他は同様にした比較例1~23のグリースを調製した。
比較例24は市販のMoDTCを含有するウレアグリースである。
なお、表中に示す各成分は以下のとおりであり、表中の数字は質量%を示す。
MoDTC(硫化ジアルキルジチオカルバミン酸モリブデン):商品名サクラルーブ600(旭電化工業社製)
パームオレイン :パームオレイン100%、沃素価66~70、上昇融点13℃以下
パームステアリン:パームステアリン100%、沃素価22~48、上昇融点44~56℃
亜鉛スルホネート :ジノニルナフタレンスルホン酸亜鉛(塩基価50mgKOH/g以下)
硫黄-リン系極圧添加剤 :商品名:ルブリゾール810(日本ルブリゾール社製)
SRV試験
テストピース ボール :直径17.5mm(SUJ2)
プレート:直径24mm×7.85mm(SUJ2)
試験条件 荷重 :200N
周波数 :50Hz
振幅 :0.8mm
時間 :10分
試験温度:40℃
測定項目 摩擦係数(μ)
強制力試験
下記条件にて実ジョイントでの強制力試験を行い、強制力を測定した。
試験条件 回転数:200rpm
トルク:500Nm
ジョイント角度:10°
運転時間:2min.
ジョイントタイプ:トリポート型等速ジョイント
測定項目 ジョイント強制力を測定し、市販ウレアグリースを基準としての増減率(%)で評価した。
Claims (7)
- 下記の成分を含有する等速ジョイント用グリース組成物。
(a)基油、
(b)ジウレア系増ちょう剤、
(c)パームオレイン、パームステアリン及びグリセリンモノオレエートからなる群から選ばれる少なくとも1種の油性剤、
(d)次式で表される硫化ジアルキルジチオカルバミン酸モリブデン、
(R3R4N-CS-S)2-Mo2OmSn
(式中、R3及びR4は独立して、炭素数1~24のアルキル基を表し、mは0~3、nは4~1であり、m+n=4である。)
(e)亜鉛スルホネート、及び
(f)硫黄-リン系極圧添加剤。 - ジウレア系増ちょう剤が次式で表されるジウレア系増ちょう剤であることを特徴とする請求項1記載の等速ジョイント用グリース組成物。
R1-NH-CO-NH-C6H4-p-CH2-C6H4-p-NH-CO-NHR2
(R1及びR2は独立して、炭素原子数8~18のアルキル基である。) - パームオレインの沃素価が56~72及び上昇融点が24℃以下であることを特徴とする請求項1記載の等速ジョイント用グリース組成物。
- パームステアリンの沃素価が48以下及び上昇融点が44℃以上であることを特徴とする請求項1記載の等速ジョイント用グリース組成物。
- 全組成物中における各成分の含有量が、
(a)基油49.0~98.65質量%、
(b)ジウレア系増ちょう剤1.0~25.0質量%、
(c)油性剤0.1~5.0質量%、
(d)硫化ジアルキルジチオカルバミン酸モリブデン0.1~5.0質量%、
(e)亜鉛スルホネート0.1~15.0質量%、及び
(f)硫黄-リン系極圧添加剤0.05~1.0質量%
である請求項1又は2記載の等速ジョイント用グリース組成物。 - プランジング型等速ジョイント用である請求項1~5のいずれか1項記載の等速ジョイント用グリース組成物。
- 請求項1~6のいずれか1項記載の等速ジョイント用グリース組成物を封入した等速ジョイント。
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WO2006057367A1 (ja) * | 2004-11-25 | 2006-06-01 | Honda Motor Co., Ltd. | 等速ジョイント |
JP2008297447A (ja) * | 2007-05-31 | 2008-12-11 | Adeka Corp | 潤滑油およびグリース用基油 |
JP2009503194A (ja) * | 2005-07-25 | 2009-01-29 | シー.エム.インテレクチュアル プロパティー アンド リサーチ,インコーポレーテッド | 燃料及び潤滑剤の添加剤、並びに燃料経済性及び車両の排出を改善する方法 |
JP2009114354A (ja) * | 2007-11-07 | 2009-05-28 | Kyodo Yushi Co Ltd | グリース組成物 |
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WO2006057367A1 (ja) * | 2004-11-25 | 2006-06-01 | Honda Motor Co., Ltd. | 等速ジョイント |
JP2009503194A (ja) * | 2005-07-25 | 2009-01-29 | シー.エム.インテレクチュアル プロパティー アンド リサーチ,インコーポレーテッド | 燃料及び潤滑剤の添加剤、並びに燃料経済性及び車両の排出を改善する方法 |
JP2008297447A (ja) * | 2007-05-31 | 2008-12-11 | Adeka Corp | 潤滑油およびグリース用基油 |
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