WO2019208316A1 - Lubricant composition and rolling bearing - Google Patents

Lubricant composition and rolling bearing Download PDF

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Publication number
WO2019208316A1
WO2019208316A1 PCT/JP2019/016248 JP2019016248W WO2019208316A1 WO 2019208316 A1 WO2019208316 A1 WO 2019208316A1 JP 2019016248 W JP2019016248 W JP 2019016248W WO 2019208316 A1 WO2019208316 A1 WO 2019208316A1
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Prior art keywords
lubricant composition
lubricant
rolling bearing
base oil
mass
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PCT/JP2019/016248
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French (fr)
Japanese (ja)
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美和 佐藤
川村　隆之
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Ntn株式会社
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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
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/22—Compounds 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
    • 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
    • C10M125/30—Clay
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives

Definitions

  • the present invention relates to a lubricant composition and a rolling bearing.
  • Patent Documents 1 and 2 a lubricant composition containing a lubricant and a solid lubricant has been proposed as a lubricant composition.
  • fluorine grease and solid lubricants have been proposed as lubricants used for rolling bearings (Patent Documents 3 and 4).
  • Patent Document 5 a lubricating coating composition containing a solid component composed of an organosilicon polymer and a solid lubricant and an organic solvent as a lubricant for screw members has been proposed (Patent Document 5).
  • JP 2008-106204 A Japanese Patent Laying-Open No. 2015-193858 Japanese Patent No. 4277521 Japanese Patent No. 6196514 Japanese Patent No. 576494
  • Patent Document 3 cannot be used at a temperature of 300 ° C. or higher because the fluorine grease used is thermally decomposed at a temperature around 300 ° C.
  • the rolling bearing described in Patent Document 4 needs to use a specific rolling element (ball) separator formed by firing a solid lubricant.
  • the lubricating coating composition containing a solid lubricant and an organic solvent described in Patent Document 5 is used for forming a coating film on the surface of a screw-molded member, and is suitable for use by being enclosed in a rolling bearing. Not a thing.
  • An object of the present invention is to provide a lubricant composition and a rolling bearing that can exhibit lubricity in a high-temperature atmosphere.
  • the present invention provides the following [1] to [5].
  • the solid lubricant is contained in an amount of more than 20 parts by mass with respect to 100 parts by mass of the base oil, and the solid lubricant is selected from the group consisting of molybdenum disulfide, tungsten disulfide, talc, silicon dioxide, and calcium fluoride. And at least one lubricant composition.
  • the lubricant composition according to [1] including a base oil having a boiling point of 350 ° C. or lower at atmospheric pressure as the base oil.
  • the lubricant composition according to [1] or [2] which contains a polyalphaolefin as the base oil.
  • a rolling bearing in which the lubricant composition according to any one of [1] to [3] is enclosed.
  • the rolling bearing according to [4] which is used for a tenter clip of a resin film stretching machine.
  • FIG. 1 is a schematic cross-sectional view of a rolling bearing according to one embodiment of the present invention.
  • FIG. 2 is a schematic view of a transverse stretching apparatus.
  • FIG. 3 is a schematic view of a rolling bearing for a tenter clip.
  • the lubricant composition of the present invention contains more than 20 parts by mass of a solid lubricant with respect to 100 parts by mass of the base oil.
  • High temperature means a temperature of 300 ° C. or higher.
  • the high temperature is preferably 350 ° C. or higher, more preferably 400 ° C. or higher.
  • the high temperature may be, for example, a temperature of 500 ° C. or lower, but the upper limit is not particularly limited.
  • air refers to an environment in an air atmosphere under atmospheric pressure.
  • the rolling bearing may be exemplified for a rolling bearing described later.
  • a rolling bearing containing a conventional lubricant composition for example, a lubricant composition as described in Patent Documents 1 and 2
  • the base oil evaporates and slips. It was found that the moving part did not slide smoothly. The reason is that the amount of the component that acts as a lubricant remaining in the rolling bearing after the base oil evaporates decreases, and the lubrication function is not exhibited.
  • the inventor who paid attention to this increases the content of the solid lubricant with respect to the base oil in the lubricant composition, so that it works as a lubricant even after the base oil evaporates when used in a high temperature atmosphere.
  • the lubricant composition is preferably 30 parts by mass or more, more preferably 40 parts by mass or more, and still more preferably 50 parts by mass with respect to 100 parts by mass of the base lubricant from the viewpoint of improving lubricity at low temperatures. As mentioned above, it contains 60 mass parts or more especially preferably. In the case where the solid lubricant is contained in an amount of preferably 30 parts by mass or more with respect to 100 parts by mass of the base oil from the viewpoint of improving the lubricity at low temperatures, the solid lubricant remains sufficiently even after the base oil has evaporated at a high temperature. Therefore, the rolling bearing tends to slide smoothly.
  • the lubricant composition may contain 200 parts by mass or less of the solid lubricant with respect to 100 parts by mass of the base oil, for example, 150 parts by mass or less or 100 parts by mass or less.
  • the solid lubricant is easily dispersed in the lubricant composition, and is uniform on the surface of the rolling element in the rolling bearing. Since it becomes easy to adhere at a density, the rolling bearing tends to slide smoothly.
  • the lubricant composition is preferably liquid or semi-solid. It is preferable that the lubricant composition is in a liquid or semi-solid form because it can be enclosed in a rolling bearing in the same manner as grease used for a general rolling bearing.
  • the lubricant composition may have a friction coefficient at a point contact maximum surface pressure of 1.41 GPa obtained in the SRV frictional wear test of, for example, 0.40 or less, preferably 0.38 or less, more preferably 0.36 or less. More preferably, it is 0.34 or less. Further, the lubricant composition may have a friction coefficient at a point contact maximum surface pressure of 1.71 GPa obtained in the SRV frictional wear test of, for example, 0.60 or less, preferably 0.50 or less, more preferably 0.8. It is 40 or less, more preferably 0.30 or less.
  • the SRV friction and wear test is a value measured according to the method described in the column of Examples described later.
  • a base oil having a boiling point of 350 ° C. or less at atmospheric pressure can be used.
  • base oils include polyalphaolefins.
  • Poly ⁇ -olefins are derived from ⁇ -olefins having 3 to 16 carbon atoms (eg, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, etc.) It may be a dimer, trimer, tetramer or higher polymer composed of structural units, and may be a copolymer composed of the structural units derived from the ⁇ -olefin and the structural units derived from ethylene.
  • poly ⁇ olefin is used as the base oil, it is preferable from the viewpoint that the solid lubricant is easy to disperse and the solid lubricant easily adheres evenly to the rolling element surface.
  • the base oil may be used alone or in combination of two or more.
  • Examples of typical commercially available products of poly- ⁇ -olefin include Shinflud 801 manufactured by Nippon Steel Chemical Co., Ltd., PAO10 manufactured by Nippon Steel & Sumikin Chemical Co., Ltd., and the like.
  • the solid lubricant is at least one selected from the group consisting of molybdenum disulfide, tungsten disulfide, talc, silicon dioxide, and calcium fluoride. Molybdenum disulfide, tungsten disulfide, talc, silicon dioxide, and calcium fluoride tend to disperse in the base oil, and when used in lubricant compositions, adhere to the track surface even after the base oil has evaporated. Therefore, good slidability is exhibited over a long period of time.
  • the lubricant composition is an additive known to be used in the lubricant composition, for example, a thickener, an antioxidant, a metal deactivator, a viscosity index improver, a rust inhibitor. Agents, friction reducers, antiwear agents, and the like. These additives can be added alone or in combination of two or more. The additive can be used in an amount that does not hinder the achievement of the object of the present invention.
  • a thickener for example, a thickener, an antioxidant, a metal deactivator, a viscosity index improver, a rust inhibitor. Agents, friction reducers, antiwear agents, and the like.
  • Agents, friction reducers, antiwear agents, and the like can be added alone or in combination of two or more.
  • the additive can be used in an amount that does not hinder the achievement of the object of the present invention.
  • FIG. 1 is a schematic sectional view of a deep groove ball bearing.
  • an inner ring 101 and an outer ring 102 are arranged concentrically, and a plurality of rolling elements 103 are arranged between the inner ring 101 and the outer ring 102.
  • the rolling element 103 is held by a holder 104.
  • Lubricant composition 105 is filled in the space around rolling element 103 and sealed by shield plate 106.
  • the shield plate 106 is fixed to the inner ring 101 and the outer ring 102, respectively.
  • the shield plate 106 prevents the lubricant composition 105 from flowing out.
  • the shield plate 106 is formed of a steel material, and for example, austenitic stainless steel such as SUS304 having excellent corrosion resistance can be used.
  • Lubricant composition 105 is the above-described lubricant composition of the present invention. Examples of components and blending ratios in the lubricant composition may be those described above.
  • Rolling bearings are not limited to deep groove ball bearings, but various types of rolling bearings such as angular ball bearings, thrust ball bearings, cylindrical roller bearings, needle roller bearings, thrust cylindrical roller bearings, thrust needle roller bearings, tapered roller bearings. , A thrust tapered roller bearing, a self-aligning ball bearing, a self-aligning roller bearing, a thrust self-aligning roller bearing or a plain bearing.
  • the resin film stretching machine can be used as a transverse stretching apparatus of a stretched film manufacturing apparatus.
  • FIG. 2 is a schematic view of a transverse stretching apparatus.
  • the transverse stretching apparatus 200 stretches the sheet 201 from the extruder or the longitudinal stretching apparatus in the sheet width direction.
  • the lateral stretching apparatus 200 includes a pair of rotating guide rails 202, a plurality of tenter clips 203 that rotate around the guide rails 202 at a predetermined interval, and a heating unit.
  • the sheet 201 is stretched in the width direction of the sheet along the guide rail 202 while being heat-treated in a state where both ends are sandwiched between the plurality of tenter clips 203 in the lateral stretching apparatus 200, and a stretched film 204 stretched in the lateral direction Become.
  • FIG. 3 is a schematic view of a rolling bearing for a tenter clip.
  • the tenter clip 203 is provided with a grip portion 302 that grips the sheet 201 and a plurality of tenter clip rolling bearings 301 that allow the tenter clip 203 to travel while being guided by the guide rail 202.
  • the rolling bearing 301 used for the tenter clip 203 is exposed to a temperature of 300 ° C. or higher in the transverse stretching apparatus 200 that performs heat treatment. Therefore, the lubricant composition of the present invention that can exhibit lubricity even at a high temperature is suitable for the rolling bearing used for the tenter clip 203.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Lubricants (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The purpose of the present invention is to provide: a lubricant composition which is capable of exhibiting lubricating properties in a high-temperature atmosphere; and a rolling bearing. The present invention provides: a lubricant composition, which contains more than 20 parts by mass of a solid lubricant per 100 parts by mass of a base oil, and which is configured such that the solid lubricant is composed of at least one compound that is selected from the group consisting of molybdenum disulfide, tungsten disulfide, talc, silicon dioxide and calcium fluoride; and a rolling bearing in which this lubricant composition is sealed.

Description

潤滑剤組成物および転がり軸受Lubricant composition and rolling bearing
　本発明は、潤滑剤組成物および転がり軸受に関する。 The present invention relates to a lubricant composition and a rolling bearing.
　従来、潤滑剤組成物として、潤滑油と固体潤滑剤とを含む潤滑剤組成物が提案されている（特許文献１及び２）。また、転がり軸受に用いる潤滑剤としてフッ素グリースや固体潤滑剤が提案されている（特許文献３及び４）。さらに、ネジ部材用潤滑剤として有機ケイ素ポリマーと固体潤滑剤からなる固体成分と有機溶剤とを含む潤滑塗料組成物が提案されている（特許文献５）。 Conventionally, a lubricant composition containing a lubricant and a solid lubricant has been proposed as a lubricant composition (Patent Documents 1 and 2). Further, fluorine grease and solid lubricants have been proposed as lubricants used for rolling bearings (Patent Documents 3 and 4). Furthermore, a lubricating coating composition containing a solid component composed of an organosilicon polymer and a solid lubricant and an organic solvent as a lubricant for screw members has been proposed (Patent Document 5).
特開２００８－１０６２０４号公報JP 2008-106204 A 特開２０１５－１９３８５８号公報Japanese Patent Laying-Open No. 2015-193858 特許第４２７７５２１号公報Japanese Patent No. 4277521 特許第６１９６５１４号公報Japanese Patent No. 6196514 特許第５７６３４９４号公報Japanese Patent No. 576494
　特許文献１及び２に記載の潤滑剤組成物は、転がり軸受に用いた場合、例えば３００℃以上の温度では摺動性が十分に得られない。 When the lubricant composition described in Patent Documents 1 and 2 is used for a rolling bearing, for example, a sliding property cannot be sufficiently obtained at a temperature of 300 ° C. or higher.
　特許文献３に記載の転がり軸受は、用いられるフッ素グリースが３００℃付近の温度で熱分解するため３００℃以上の温度では使用することができない。 The rolling bearing described in Patent Document 3 cannot be used at a temperature of 300 ° C. or higher because the fluorine grease used is thermally decomposed at a temperature around 300 ° C.
　特許文献４に記載の転がり軸受は、固体潤滑剤を焼成することにより形成される特定の転動体（ボール）セパレータを用いる必要がある。 The rolling bearing described in Patent Document 4 needs to use a specific rolling element (ball) separator formed by firing a solid lubricant.
　特許文献５に記載の固体潤滑剤と有機溶剤とを含む潤滑塗料組成物は、ネジ成形部材の表面に塗膜を形成するために用いられるものであり、転がり軸受に封入して用いるのに適したものではない。 The lubricating coating composition containing a solid lubricant and an organic solvent described in Patent Document 5 is used for forming a coating film on the surface of a screw-molded member, and is suitable for use by being enclosed in a rolling bearing. Not a thing.
　本発明の目的は、高温の大気中で潤滑性を発揮することができる潤滑剤組成物および転がり軸受を提供することである。 An object of the present invention is to provide a lubricant composition and a rolling bearing that can exhibit lubricity in a high-temperature atmosphere.
　本発明は以下の［１］～［５］を提供する。
［１］　基油１００質量部に対して固体潤滑剤を２０質量部より多く含み、前記固体潤滑剤は、二硫化モリブデン、二硫化タングステン、滑石、二酸化ケイ素及びフッ化カルシウムからなる群から選択される少なくとも１種である、潤滑剤組成物。
［２］　前記基油として、大気圧中で３５０℃以下の沸点を有する基油を含む、［１］に記載の潤滑剤組成物。
［３］　前記基油として、ポリαオレフィンを含む、［１］または［２］に記載の潤滑剤組成物。
［４］　［１］～［３］のいずれかに記載の潤滑剤組成物が封入された転がり軸受。
［５］　樹脂フィルム延伸機のテンタークリップに用いられる、［４］に記載の転がり軸受。 The present invention provides the following [1] to [5].
[1] The solid lubricant is contained in an amount of more than 20 parts by mass with respect to 100 parts by mass of the base oil, and the solid lubricant is selected from the group consisting of molybdenum disulfide, tungsten disulfide, talc, silicon dioxide, and calcium fluoride. And at least one lubricant composition.
[2] The lubricant composition according to [1], including a base oil having a boiling point of 350 ° C. or lower at atmospheric pressure as the base oil.
[3] The lubricant composition according to [1] or [2], which contains a polyalphaolefin as the base oil.
[4] A rolling bearing in which the lubricant composition according to any one of [1] to [3] is enclosed.
[5] The rolling bearing according to [4], which is used for a tenter clip of a resin film stretching machine.
　本発明によれば、高温の大気中で潤滑性を発揮することができる潤滑剤組成物および転がり軸受を提供することができる。 According to the present invention, it is possible to provide a lubricant composition and a rolling bearing that can exhibit lubricity in a high-temperature atmosphere.
図１は、本発明の一態様にかかる転がり軸受の概略断面図である。FIG. 1 is a schematic cross-sectional view of a rolling bearing according to one embodiment of the present invention. 図２は、横延伸装置の概略図である。FIG. 2 is a schematic view of a transverse stretching apparatus. 図３は、テンタークリップ用転がり軸受けの概略図である。FIG. 3 is a schematic view of a rolling bearing for a tenter clip.
＜潤滑剤組成物＞
　本発明の潤滑剤組成物は、基油１００質量部に対して固体潤滑剤を２０質量部より多く含む。基油１００質量部に対して固体潤滑剤が２０質量部以下である場合、高温の大気中において良好な摺動性が得られなくなる傾向にある。高温とは３００℃以上の温度をいう。高温は、好ましくは３５０℃以上、より好ましくは４００℃以上である。一方、高温は、例えば５００℃以下の温度であってよいが、上限は特に限定されない。また、大気中とは、大気圧下、空気雰囲気中の環境をいう。転がり軸受は、後述の転がり軸受について例示するものであってよい。 <Lubricant composition>
The lubricant composition of the present invention contains more than 20 parts by mass of a solid lubricant with respect to 100 parts by mass of the base oil. When the solid lubricant is 20 parts by mass or less with respect to 100 parts by mass of the base oil, good sliding properties tend not to be obtained in a high temperature atmosphere. High temperature means a temperature of 300 ° C. or higher. The high temperature is preferably 350 ° C. or higher, more preferably 400 ° C. or higher. On the other hand, the high temperature may be, for example, a temperature of 500 ° C. or lower, but the upper limit is not particularly limited. The term “air” refers to an environment in an air atmosphere under atmospheric pressure. The rolling bearing may be exemplified for a rolling bearing described later.
　本願発明の発明者によれば、従来の潤滑剤組成物、例えば特許文献１および２に記載のような潤滑剤組成物を含む転がり軸受は、高温で用いた場合、基油が蒸発し、摺動部が滑らかに摺動しないことが分かった。その理由は、基油が蒸発した後に転がり軸受中に残存する潤滑剤として働く成分の量が少なくなり、潤滑機能が発揮されないためであることを突止めた。このことに着目した発明者は、潤滑剤組成物中の基油に対する固体潤滑剤の含有量を多くすることにより、高温の大気中で用いた場合に基油が蒸発した後でも潤滑剤として働く成分の割合が多くなり、高温の大気中で潤滑機能が長期間にわたり維持され、良好な摺動性が得られることを見出した。また、固体潤滑剤は基油中に分散しているので、固体潤滑剤を転がり軸受中に封入し易くなることも見出した。 According to the inventors of the present invention, when a rolling bearing containing a conventional lubricant composition, for example, a lubricant composition as described in Patent Documents 1 and 2, is used at a high temperature, the base oil evaporates and slips. It was found that the moving part did not slide smoothly. The reason is that the amount of the component that acts as a lubricant remaining in the rolling bearing after the base oil evaporates decreases, and the lubrication function is not exhibited. The inventor who paid attention to this increases the content of the solid lubricant with respect to the base oil in the lubricant composition, so that it works as a lubricant even after the base oil evaporates when used in a high temperature atmosphere. It has been found that the ratio of the components increases, the lubricating function is maintained for a long period of time in a high-temperature atmosphere, and good slidability can be obtained. It has also been found that since the solid lubricant is dispersed in the base oil, it becomes easier to enclose the solid lubricant in the rolling bearing.
　潤滑剤組成物は、固体潤滑剤を、基油１００質量部に対して、低温時の潤滑性向上の観点から好ましくは３０質量部以上、より好ましくは４０質量部以上、さらに好ましくは５０質量部以上、特に好ましくは６０質量部以上含む。固体潤滑剤を、基油１００質量部に対して、低温時の潤滑性向上の観点から好ましくは３０質量部以上含む場合、高温において基油が蒸発した後においても固体潤滑剤が十分に残存するため、転がり軸受が滑らかに摺動し易くなる傾向にある。 The lubricant composition is preferably 30 parts by mass or more, more preferably 40 parts by mass or more, and still more preferably 50 parts by mass with respect to 100 parts by mass of the base lubricant from the viewpoint of improving lubricity at low temperatures. As mentioned above, it contains 60 mass parts or more especially preferably. In the case where the solid lubricant is contained in an amount of preferably 30 parts by mass or more with respect to 100 parts by mass of the base oil from the viewpoint of improving the lubricity at low temperatures, the solid lubricant remains sufficiently even after the base oil has evaporated at a high temperature. Therefore, the rolling bearing tends to slide smoothly.
　一方、潤滑剤組成物は、固体潤滑剤を、基油１００質量部に対して通常２００質量部以下含んでよく、例えば１５０質量部以下または１００質量部以下含むことができる。潤滑剤組成物が、固体潤滑剤を基油１００質量部に対して２００質量部以下含む場合、固体潤滑剤が潤滑剤組成物中で分散し易くなり、転がり軸受中の転動体表面に均一な密度で付着し易くなるため、転がり軸受が滑らかに摺動し易くなる傾向にある。 On the other hand, the lubricant composition may contain 200 parts by mass or less of the solid lubricant with respect to 100 parts by mass of the base oil, for example, 150 parts by mass or less or 100 parts by mass or less. When the lubricant composition contains 200 parts by mass or less of the solid lubricant with respect to 100 parts by mass of the base oil, the solid lubricant is easily dispersed in the lubricant composition, and is uniform on the surface of the rolling element in the rolling bearing. Since it becomes easy to adhere at a density, the rolling bearing tends to slide smoothly.
　潤滑剤組成物は液状または半固形状であることが好ましい。潤滑剤組成物が液状または半固形状である場合、一般的な転がり軸受に用いるグリース等と同様に転がり軸受中に封入することができるため好ましい。 The lubricant composition is preferably liquid or semi-solid. It is preferable that the lubricant composition is in a liquid or semi-solid form because it can be enclosed in a rolling bearing in the same manner as grease used for a general rolling bearing.
　潤滑剤組成物は、ＳＲＶ摩擦摩耗試験において得られる点接触最大面圧１．４１ＧＰａでの摩擦係数が例えば０．４０以下であってよく、好ましくは０．３８以下、より好ましくは０．３６以下、さらに好ましくは０．３４以下である。また、潤滑剤組成物は、ＳＲＶ摩擦摩耗試験において得られる点接触最大面圧１．７１ＧＰａでの摩擦係数が例えば０．６０以下であってよく、好ましくは０．５０以下、より好ましくは０．４０以下、さらに好ましくは０．３０以下である。ＳＲＶ摩擦摩耗試験において得られる点接触最大面圧１．４１ＧＰａまたは１．７１ＧＰａでの摩擦係数が上記値以下である場合、転がり軸受が滑らかに摺動し易くなる傾向にある。ＳＲＶ摩擦摩耗試験は、後述する実施例の欄において説明する方法にしたがって測定した値である。 The lubricant composition may have a friction coefficient at a point contact maximum surface pressure of 1.41 GPa obtained in the SRV frictional wear test of, for example, 0.40 or less, preferably 0.38 or less, more preferably 0.36 or less. More preferably, it is 0.34 or less. Further, the lubricant composition may have a friction coefficient at a point contact maximum surface pressure of 1.71 GPa obtained in the SRV frictional wear test of, for example, 0.60 or less, preferably 0.50 or less, more preferably 0.8. It is 40 or less, more preferably 0.30 or less. When the friction coefficient at the point contact maximum surface pressure of 1.41 GPa or 1.71 GPa obtained in the SRV frictional wear test is not more than the above value, the rolling bearing tends to slide smoothly. The SRV friction and wear test is a value measured according to the method described in the column of Examples described later.
　基油は、大気圧中で３５０℃以下の沸点を有する基油を用いることができる。このような基油の例としては、ポリαオレフィンが挙げられる。ポリαオレフィンは、炭素原子数３～１６のα－オレフィン（例えばプロピレン、１－ブテン、１－ヘキセン、１－オクテン、１－デセン、１－ドデセン、１－テトラデセン、１－ヘキサデセン等）に由来する構成単位からなるダイマー、トリマー、テトラマーもしくはそれ以上の重合体であってよく、上記αーオレフィンに由来する構成単位とエチレンに由来する構成単位とからなる共重合体であってもよい。ポリαオレフィンを基油として用いる場合、固体潤滑剤が分散し易く、固体潤滑剤が転動体表面に均等に付着し易くなる観点から好ましい。 As the base oil, a base oil having a boiling point of 350 ° C. or less at atmospheric pressure can be used. Examples of such base oils include polyalphaolefins. Poly α-olefins are derived from α-olefins having 3 to 16 carbon atoms (eg, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, etc.) It may be a dimer, trimer, tetramer or higher polymer composed of structural units, and may be a copolymer composed of the structural units derived from the α-olefin and the structural units derived from ethylene. When poly α olefin is used as the base oil, it is preferable from the viewpoint that the solid lubricant is easy to disperse and the solid lubricant easily adheres evenly to the rolling element surface.
　基油は、単独で用いてもよく、２種以上を組合わせて用いてもよい。ポリαオレフィンの代表的市販品の例としては、新日鐵化学株式会社製シンフルード８０１、新日鐵住金化学株式会社製ＰＡＯ１０等が挙げられる。 The base oil may be used alone or in combination of two or more. Examples of typical commercially available products of poly-α-olefin include Shinflud 801 manufactured by Nippon Steel Chemical Co., Ltd., PAO10 manufactured by Nippon Steel & Sumikin Chemical Co., Ltd., and the like.
　固体潤滑剤は、二硫化モリブデン、二硫化タングステン、滑石、二酸化ケイ素及びフッ化カルシウムからなる群から選択される少なくとも１種である。二硫化モリブデン、二硫化タングステン、滑石、二酸化ケイ素及びフッ化カルシウムは、基油に分散し易い傾向があり、潤滑剤組成物中で用いた場合、基油が蒸発した後でも軌道面に付着することで良好な摺動性が長期間にわたり発揮される。 The solid lubricant is at least one selected from the group consisting of molybdenum disulfide, tungsten disulfide, talc, silicon dioxide, and calcium fluoride. Molybdenum disulfide, tungsten disulfide, talc, silicon dioxide, and calcium fluoride tend to disperse in the base oil, and when used in lubricant compositions, adhere to the track surface even after the base oil has evaporated. Therefore, good slidability is exhibited over a long period of time.
　潤滑剤組成物は、基油および固体潤滑剤以外に、潤滑剤組成物に用いることが公知である添加剤、例えば増ちょう剤、酸化防止剤、金属不活性剤、粘度指数向上剤、防錆剤、摩擦低減剤、摩耗防止剤等が挙げられる。これらの添加剤は、単独でまたは２種以上を組み合せて添加することができる。添加剤は、本発明の目的を達成するのを阻害しない範囲の量で用いることができる。
＜転がり軸受＞
　転がり軸受について、以下に図面を用いて説明する。図１は深溝玉軸受の概略断面図である。深溝玉軸受１００は、内輪１０１と外輪１０２とが同心に配置され、内輪１０１と外輪１０２との間に複数個の転動体１０３が配置される。転動体１０３は保持器１０４により保持される。潤滑剤組成物１０５が転動体１０３の周囲の空隙部に充填され、シールド板１０６により封止される。 In addition to the base oil and the solid lubricant, the lubricant composition is an additive known to be used in the lubricant composition, for example, a thickener, an antioxidant, a metal deactivator, a viscosity index improver, a rust inhibitor. Agents, friction reducers, antiwear agents, and the like. These additives can be added alone or in combination of two or more. The additive can be used in an amount that does not hinder the achievement of the object of the present invention.
<Rolling bearing>
The rolling bearing will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of a deep groove ball bearing. In the deep groove ball bearing 100, an inner ring 101 and an outer ring 102 are arranged concentrically, and a plurality of rolling elements 103 are arranged between the inner ring 101 and the outer ring 102. The rolling element 103 is held by a holder 104. Lubricant composition 105 is filled in the space around rolling element 103 and sealed by shield plate 106.
　シールド板１０６は、内輪１０１および外輪１０２にそれぞれ固定されて設けられる。シールド板１０６は、潤滑剤組成物１０５が流出するのを防ぐ。シールド板１０６は鋼材料で形成し、例えば耐食性に優れるＳＵＳ３０４等のオーステナイト系ステンレス鋼を用いることができる。 The shield plate 106 is fixed to the inner ring 101 and the outer ring 102, respectively. The shield plate 106 prevents the lubricant composition 105 from flowing out. The shield plate 106 is formed of a steel material, and for example, austenitic stainless steel such as SUS304 having excellent corrosion resistance can be used.
　潤滑剤組成物１０５は、上述の本発明の潤滑剤組成物である。潤滑剤組成物中の成分及び配合比の例は、上述したものであってよい。 Lubricant composition 105 is the above-described lubricant composition of the present invention. Examples of components and blending ratios in the lubricant composition may be those described above.
　転がり軸受は、深溝玉軸受に限らず、種々の形式の転がり軸受、例えばアンギュラ玉軸受、スラスト玉軸受、円筒ころ軸受、針状ころ軸受、スラスト円筒ころ軸受、スラスト針状ころ軸受、円すいころ軸受、スラスト円すいころ軸受、自動調心玉軸受、自動調心ころ軸受、スラスト自動調心ころ軸受またはすべり軸受等であってよい。
＜樹脂フィルム延伸機のテンタークリップ＞
　樹脂フィルム延伸機は、延伸フィルム製造装置の横延伸装置として用いることができる。図２は、横延伸装置の概略図である。横延伸装置２００は、押出機または縦延伸装置からのシート２０１をシート幅方向に延伸する。横延伸装置２００は、一対の周回するガイドレール２０２と、ガイドレール２０２上を一定の間隔をあけて周回する複数のテンタークリップ２０３と、加熱手段とを有する。シート２０１は横延伸装置２００において、複数のテンタークリップ２０３に両端を挟まれた状態で熱処理されながら、ガイドレール２０２に沿ってシートの幅方向に延伸され、横方向に延伸された延伸フィルム２０４となる。 Rolling bearings are not limited to deep groove ball bearings, but various types of rolling bearings such as angular ball bearings, thrust ball bearings, cylindrical roller bearings, needle roller bearings, thrust cylindrical roller bearings, thrust needle roller bearings, tapered roller bearings. , A thrust tapered roller bearing, a self-aligning ball bearing, a self-aligning roller bearing, a thrust self-aligning roller bearing or a plain bearing.
<Tenter clip of resin film stretching machine>
The resin film stretching machine can be used as a transverse stretching apparatus of a stretched film manufacturing apparatus. FIG. 2 is a schematic view of a transverse stretching apparatus. The transverse stretching apparatus 200 stretches the sheet 201 from the extruder or the longitudinal stretching apparatus in the sheet width direction. The lateral stretching apparatus 200 includes a pair of rotating guide rails 202, a plurality of tenter clips 203 that rotate around the guide rails 202 at a predetermined interval, and a heating unit. The sheet 201 is stretched in the width direction of the sheet along the guide rail 202 while being heat-treated in a state where both ends are sandwiched between the plurality of tenter clips 203 in the lateral stretching apparatus 200, and a stretched film 204 stretched in the lateral direction Become.
　図３は、テンタークリップ用転がり軸受けの概略図である。テンタークリップ２０３には、シート２０１を把持する把持部３０２と、テンタークリップ２０３がガイドレール２０２にガイドされつつ走行可能とするための複数のテンタークリップ用転がり軸受３０１とが設けられている。 FIG. 3 is a schematic view of a rolling bearing for a tenter clip. The tenter clip 203 is provided with a grip portion 302 that grips the sheet 201 and a plurality of tenter clip rolling bearings 301 that allow the tenter clip 203 to travel while being guided by the guide rail 202.
　テンタークリップ２０３に用いられる転がり軸受３０１は、加熱処理を行なう横延伸装置２００内において３００℃以上の温度にさらされる。したがって、テンタークリップ２０３に用いられる転がり軸受には、高温においても潤滑性を発揮できる本発明の潤滑剤組成物が好適である。 The rolling bearing 301 used for the tenter clip 203 is exposed to a temperature of 300 ° C. or higher in the transverse stretching apparatus 200 that performs heat treatment. Therefore, the lubricant composition of the present invention that can exhibit lubricity even at a high temperature is suitable for the rolling bearing used for the tenter clip 203.
　以下、実施例を示して本発明をさらに具体的に説明するが、本発明はこれらの例によって限定されるものではない。 Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
［ＳＲＶ摩擦摩耗試験］
　各実施例および比較例の潤滑剤組成物について、以下の測定条件にしたがって摩擦係数を求めた。
テストピース：Ｓｉ３Ｎ４でできたボール（直径９．５２５ｍｍ）
　　　　　　　ＳＵＳ４４０Ｃでできた円盤プレート（直径２４ｍｍ×７．９ｍｍ）
評価条件：　　点接触最大面圧（Ｐｍａｘ）　１．４１ＧＰａ、１．７１ＧＰａ
　　　　　　　周波数　１０Ｈｚ
　　　　　　　振幅　１ｍｍ
　　　　　　　時間　３０分
　　　　　　　試験温度　３５０℃
測定項目：　　摩擦係数
＜実施例１～１０及び比較例１～３＞
　下記表１及び２に示す配合比で基油に固体潤滑剤をそれぞれ混合して潤滑剤組成物を得た。得られた潤滑剤組成物についてＳＲＶ摩擦摩耗試験に供し、摩擦係数を測定した。結果を表１及び表２に示す。 [SRV friction and wear test]
About the lubricant composition of each Example and the comparative example, the friction coefficient was calculated | required according to the following measurement conditions.
Test piece: Ball made of Si 3 N 4 (diameter 9.525 mm)
Disc plate made of SUS440C (diameter 24mm x 7.9mm)
Evaluation conditions: Point contact maximum surface pressure (P max ) 1.41 GPa, 1.71 GPa
Frequency 10Hz
Amplitude 1mm
Time 30 minutes Test temperature 350 ℃
Measurement item: Friction coefficient <Examples 1 to 10 and Comparative Examples 1 to 3>
A lubricant composition was obtained by mixing a solid lubricant with the base oil at the blending ratios shown in Tables 1 and 2 below. The obtained lubricant composition was subjected to an SRV frictional wear test, and the friction coefficient was measured. The results are shown in Tables 1 and 2.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
〔基油１〕
　ポリαオレフィン油（シンフルード８０１、新日鐵化学株式会社）
〔市販潤滑剤１〕
　スミペーストＢＮ（窒化ホウ素含有潤滑剤、住鉱潤滑剤株式会社より入手）
〔固体潤滑剤１〕
　二硫化モリブデン（株式会社高純度化学研究所より入手）
〔固体潤滑剤２〕
　二硫化タングステン（株式会社高純度化学研究所より入手）
〔固体潤滑剤３〕
　滑石（日本タルク株式会社より入手）
〔固体潤滑剤４〕
　二酸化ケイ素（株式会社高純度化学研究所より入手）
〔固体潤滑剤５〕
　フッ化カルシウム（和光純薬工業株式会社より入手）
〔固体潤滑剤６〕
　窒化ホウ素（株式会社高純度化学研究所より入手）
　表１及び表２に示される通り、本発明に従う潤滑剤組成物は、３５０℃のような高い温度においても摩擦係数が低く、潤滑性を発揮することができる。 [Base oil 1]
Poly alpha olefin oil (Sinfluid 801, Nippon Steel Chemical Co., Ltd.)
[Commercial lubricant 1]
Sumi paste BN (boron nitride-containing lubricant, available from Sumiko Lubricant Co., Ltd.)
[Solid lubricant 1]
Molybdenum disulfide (obtained from High Purity Chemical Research Laboratory)
[Solid lubricant 2]
Tungsten disulfide (obtained from High Purity Chemical Laboratory, Inc.)
[Solid lubricant 3]
Talc (obtained from Nippon Talc Co., Ltd.)
[Solid lubricant 4]
Silicon dioxide (obtained from High Purity Chemical Laboratory Co., Ltd.)
[Solid lubricant 5]
Calcium fluoride (obtained from Wako Pure Chemical Industries, Ltd.)
[Solid lubricant 6]
Boron nitride (obtained from High Purity Chemical Laboratory, Inc.)
As shown in Tables 1 and 2, the lubricant composition according to the present invention has a low coefficient of friction and can exhibit lubricity even at a high temperature such as 350 ° C.
　１００　深溝玉軸受、１０１　内輪、１０２　外輪、１０３　転動体、１０４　保持器、１０５　潤滑剤組成物、１０６　シールド板、２００　横延伸装置、２０１　シート、２０２　ガイドレール、２０３　テンタークリップ、２０４　延伸フィルム、３０１　テンタークリップ用転がり軸受、３０２　把持部。 100 deep groove ball bearing, 101 inner ring, 102 outer ring, 103 rolling element, 104 retainer, 105 lubricant composition, 106 shield plate, 200 transverse stretching device, 201 sheet, 202 guide rail, 203 tenter clip, 204 stretched film, 301 Roller bearing for tenter clip, 302 gripping part.

Claims (5)

  1. 　基油１００質量部に対して固体潤滑剤を２０質量部より多く含み、前記固体潤滑剤は、二硫化モリブデン、二硫化タングステン、滑石、二酸化ケイ素及びフッ化カルシウムからなる群から選択される少なくとも１種である、潤滑剤組成物。 The solid lubricant is contained in an amount of more than 20 parts by mass with respect to 100 parts by mass of the base oil, and the solid lubricant is at least one selected from the group consisting of molybdenum disulfide, tungsten disulfide, talc, silicon dioxide, and calcium fluoride. A lubricant composition that is a seed.
  2. 　前記基油として、大気圧中で３５０℃以下の沸点を有する基油を含む、請求項１に記載の潤滑剤組成物。 The lubricant composition according to claim 1, comprising a base oil having a boiling point of 350 ° C or lower at atmospheric pressure as the base oil.
  3. 　前記基油として、ポリαオレフィンを含む、請求項１または２に記載の潤滑剤組成物。 The lubricant composition according to claim 1 or 2, wherein the base oil contains a polyalphaolefin.
  4. 　請求項１～３のいずれか一項に記載の潤滑剤組成物が封入された転がり軸受。 A rolling bearing in which the lubricant composition according to any one of claims 1 to 3 is enclosed.
  5. 　樹脂フィルム延伸機のテンタークリップに用いられる、請求項４に記載の転がり軸受。 The rolling bearing according to claim 4, which is used for a tenter clip of a resin film stretching machine.
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