WO2013088965A1 - Palier et palier à roulement - Google Patents

Palier et palier à roulement Download PDF

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Publication number
WO2013088965A1
WO2013088965A1 PCT/JP2012/080923 JP2012080923W WO2013088965A1 WO 2013088965 A1 WO2013088965 A1 WO 2013088965A1 JP 2012080923 W JP2012080923 W JP 2012080923W WO 2013088965 A1 WO2013088965 A1 WO 2013088965A1
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WO
WIPO (PCT)
Prior art keywords
fluororesin
bearing
resin
aromatic
sliding member
Prior art date
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PCT/JP2012/080923
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English (en)
Japanese (ja)
Inventor
増田　晴久
有希 足立
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ダイキン工業株式会社
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Publication of WO2013088965A1 publication Critical patent/WO2013088965A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C09D127/18—Homopolymers or copolymers of tetrafluoroethene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/32—Balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/44—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2650/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G2650/28—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type
    • C08G2650/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group
    • C08G2650/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group containing ketone groups, e.g. polyarylethylketones, PEEK or PEK
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/02—Plastics; Synthetic resins, e.g. rubbers comprising fillers, fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/36—Polyarylene ether ketones [PAEK], e.g. PEK, PEEK

Definitions

  • the present invention relates to a bearing and a rolling bearing.
  • aromatic polyetherketone resins such as polyetheretherketone (PEEK) resin are known as engineering plastics having excellent heat resistance, mechanical properties, and sliding properties.
  • PEEK polyetheretherketone
  • Such aromatic polyetherketone resins Various materials and component parts for bearings using slabs have been proposed.
  • Patent Document 1 discloses a bearing molding material composed of 28 to 91% by weight of aromatic polyether ketone, 3 to 24% by weight of carbon fiber, 3 to 24% by weight of spherical glass, and 3 to 24% by weight of a fluorocarbon polymer. ing.
  • Patent Document 2 describes a sheet having a specific thickness, which is made of a polyether ether ketone resin as a main component and rolled at a specific magnification, as a bearing member for a motor, and a resin other than the polyether ether ketone resin. It is described that a fluorocarbon polymer such as tetrafluoroethylene can be used.
  • Patent Document 3 in a multi-layer bearing in which a resin layer obtained by adding 0.1 to 50% by weight of polytetrafluoroethylene to a polyether ether ketone base resin is bonded to a back metal, the polytetrafluoroethylene is dispersed in a granular form. Multi-layer bearings have been proposed.
  • Patent Document 4 a circulating means for circulating a coolant and a sliding bearing for a water pump made of resin that rotatably supports a rotating shaft fixed at one end, the resin being a polyetherketone type resin.
  • a water bearing slide bearing made of resin has been proposed, and it is described that fluororesin powder may be added as a solid lubricant.
  • Patent Document 5 discloses a bearing structure that supports a movable element of a bearing, and includes at least one composition comprising a first polymer material having a Rockwell hardness (M scale) in the range of 80 to 130.
  • Illustrated are polymeric materials of the type comprising b) at least one of a ketone and sulfone moiety; and (c) an ether moiety.
  • the composition may contain a fluorocarbon material.
  • Patent Document 6 discloses (A) polyaryl ketone resin 70 to 99% by mass and (B) fluororesin 30 to 1% by mass as a composition for producing relatively thin molded articles such as films and sheets. (B) A fluororesin dispersed in the resin composition has an average particle size of 0.1 to 30 ⁇ m.
  • Patent Document 7 aims to provide a film having a high Young's modulus, a low dielectric constant, excellent flame retardancy, heat resistance, insulation, and high rigidity, and an FPC using the film as a base material.
  • a polyaryl ketone film characterized by being stretched in the direction has been proposed.
  • JP 2002-323044 A JP 2007-120588 A JP 2000-169697 A JP 2002-139045 A Special table 2010-518799 JP 2006-274073 A JP 2003-82123 A
  • the bearing is characterized by a melt viscosity ratio (I) / (II) of the aromatic polyetherketone resin (I) and the fluororesin (II) of 0.3 to 5.0.
  • the fluororesin (II) is dispersed in the form of particles in the aromatic polyetherketone resin (I), and the average dispersed particle size of the fluororesin (II) is 0.5 ⁇ m or less. preferable.
  • the fluororesin (II) is dispersed in the form of particles in the aromatic polyetherketone resin (I), and the maximum dispersed particle size of the fluororesin (II) is 1.0 ⁇ m or less. preferable.
  • the mass ratio (I) :( II) of the aromatic polyether ketone resin (I) to the fluororesin (II) is preferably 95: 5 to 50:50.
  • the fluororesin (II) preferably has a melt flow rate of 0.1 to 100 g / 10 min.
  • the aromatic polyether ketone resin (I) is preferably a polyether ether ketone.
  • the present invention also provides a rolling bearing comprising a sliding member formed from a resin composition containing an aromatic polyether ketone resin (I) and a fluororesin (II), wherein the fluororesin (II) is tetrafluoroethylene.
  • CF 2 CF-Rf 1 (1)
  • Rf 1 represents —CF 3 or —ORf 2.
  • Rf 2 represents a perfluoroalkyl group having 1 to 5 carbon atoms
  • the sliding member is characterized in that the melt viscosity ratio (I) / (II) of the aromatic polyetherketone resin (I) and the fluororesin (II) is 0.3 to 5.0. It is also a rolling bearing.
  • the fluororesin (II) is dispersed in the form of particles in the aromatic polyetherketone resin (I), and the average dispersed particle size of the fluororesin (II) is preferably 0.5 ⁇ m or less. .
  • the fluororesin (II) is preferably dispersed in the form of particles in the aromatic polyetherketone resin (I), and the maximum dispersed particle diameter of the fluororesin (II) is preferably 1.0 ⁇ m or less. .
  • the sliding member preferably has a mass ratio (I) :( II) of the aromatic polyether ketone resin (I) to the fluororesin (II) of 95: 5 to 50:50.
  • the fluororesin (II) preferably has a melt flow rate of 0.1 to 100 g / 10 min.
  • the aromatic polyether ketone resin (I) is preferably a polyether ether ketone.
  • the bearing of the present invention has the above-described configuration, it has excellent wear resistance and can reduce shaft wear. Moreover, since the rolling bearing of this invention has the said structure, the abrasion resistance of a sliding member is excellent.
  • FIG. 1 is a schematic cross-sectional view showing an example of a ball bearing of the present invention.
  • 2A and 2B are schematic cross-sectional views showing an example of the sliding bearing of the present invention.
  • Fig.3 (a) is a front view of the radial bearing (test bearing) manufactured in the Example
  • FIG.3 (b) is a side view.
  • FIG. 4 is a schematic cross-sectional view of the bearing durability tester used in the examples.
  • the bearing of the present invention is a bearing formed from a composition containing an aromatic polyetherketone resin (I) and a fluororesin (II).
  • the melt viscosity ratio (I) / (II) of the aromatic polyetherketone resin (I) and the fluororesin (II) is 0.3 to 5.0.
  • the bearing of this invention is formed from the composition containing aromatic polyether ketone resin (I) and fluororesin (II).
  • the bearing of the present invention is only required that at least a part of the bearing is formed from the above resin composition, and even when only a part is formed from the resin composition, it is superior in wear resistance than the conventional bearing, Although it is possible to reduce the wear of the shaft, it is preferable that the entire bearing is made of only the above resin composition because it shows more excellent wear resistance and can reduce the wear of the shaft.
  • the bearing of the present invention can be used alone or in combination with other members. When used in combination with other members, for example, it is used for rolling bearings, sliding bearings, oilless bearings, air bearings, magnetic bearings and the like.
  • the bearing of the present invention is a member that is installed on the outer periphery of the shaft and used in contact with the shaft, such as an inner ring of a rolling bearing or a sliding bearing.
  • the bearing is required to have excellent wear resistance, but when it is used in contact with the shaft like the inner ring, it is also required to reduce the wear of the shaft.
  • the bearing of the present invention can reduce not only the wear of the bearing itself but also the wear of the shaft.
  • FIG. 1 is a schematic cross-sectional view showing an example of a ball bearing.
  • the ball bearing 10 is provided on the outer periphery of the shaft 15, has an inner ring 11 and an outer ring 12, and has a ball 13 between the inner ring 11 and the outer ring 12.
  • the ball 13 is held by a cage 14.
  • the inner ring 11 of the rolling bearing wears because it rubs against the rotating shaft 15, but the amount of wear of the inner ring 11 is reduced by using the bearing of the present invention as the inner ring 11. Furthermore, the amount of wear of the shaft 15 can be reduced.
  • the bearing of the present invention When the bearing of the present invention is used as an inner ring of a rolling bearing, it is preferable that the bearing of the present invention further includes an outer ring and a rolling element, and if necessary, further includes a cage.
  • retainer About the shape of an outer ring
  • the bearing of the present invention can be used as a sliding bearing, for example.
  • the sliding bearing include a perfect circle bearing, a partial bearing, and a multi-face bearing.
  • Fig.2 (a) is a cross-sectional schematic diagram which shows an example of a sliding bearing (perfectly circular bearing).
  • the sliding bearing 20 is provided on the outer periphery of the shaft 21.
  • a fluid such as oil is usually used in the clearance between the bearing and the shaft, and the pressure generated in the fluid supports the load applied to the bearing.
  • the sliding bearing 20 wears because it rubs against the rotating shaft 21, but the amount of wear of the sliding bearing 20 is reduced by using the bearing of the present invention as the sliding bearing 20. Furthermore, the amount of wear of the shaft 20 can be reduced.
  • the sliding bearing 27 includes a reinforcing material 28 and is provided on the outer periphery of the shaft 26.
  • the reinforcing material is provided on a surface opposite to the surface in contact with the shaft.
  • a reinforcing material what consists of resin and a metal (a metal simple substance or an alloy) is mentioned, for example.
  • the reinforcing material made of metal is usually called a back metal.
  • the thickness of the sliding bearing of the present invention can be set to 3 to 50 ⁇ m, for example.
  • the thickness of the reinforcing material is not limited, but can be 3 to 50 ⁇ m, for example.
  • the bearing of the present invention normally supports a shaft that rotates or linearly moves, and holds the motion and acting load.
  • the shaft supported by the bearing of the present invention is not particularly limited, and examples thereof include aluminum, steel, stainless steel, and alloys thereof. In particular, when the shaft is made of aluminum or an aluminum alloy, the amount of wear of the bearing and the shaft is remarkably reduced.
  • the aromatic polyether ketone resin (I) is preferably at least one resin selected from the group consisting of polyether ketone, polyether ether ketone, polyether ketone ketone and polyether ketone ether ketone ketone. More preferred is at least one resin selected from the group consisting of polyetherketone and polyetheretherketone, and even more preferred is polyetheretherketone.
  • the aromatic polyether ketone resin (I) preferably has a melt viscosity of 0.25 to 1.50 kNsm ⁇ 2 at 60 sec ⁇ 1 and 390 ° C.
  • the melt viscosity is in the above range, the processing characteristics of the bearing can be improved, and wear of the bearing and the shaft can be reduced.
  • a more preferred lower limit for the melt viscosity is 0.80 kNsm -2 .
  • a more preferable upper limit of the melt viscosity is 1.30 kNsm ⁇ 2 .
  • the melt viscosity of the aromatic polyether ketone resin (I) is measured according to ASTM D3835.
  • the aromatic polyether ketone resin (I) preferably has a glass transition temperature of 130 ° C. or higher. More preferably, it is 135 degreeC or more, More preferably, it is 140 degreeC or more. When the glass transition temperature is in the above range, a bearing having excellent heat resistance can be obtained. The glass transition temperature is measured by a differential scanning calorimetry (DSC) apparatus.
  • DSC differential scanning calorimetry
  • the aromatic polyether ketone resin (I) preferably has a melting point of 300 ° C. or higher. More preferably, it is 320 degreeC or more. When the melting point is within the above range, the heat resistance of the obtained bearing can be improved. The melting point is measured by a differential scanning calorimetry (DSC) apparatus.
  • DSC differential scanning calorimetry
  • the fluororesin (II) is efficiently dispersed with respect to the aromatic polyetherketone resin (I), so that wear of the bearing and the shaft can be reduced.
  • the fluororesin (II) is efficiently dispersed with respect to the aromatic polyetherketone resin (I), so that wear of the bearing and the shaft can be reduced.
  • the fluororesin (II) is efficiently dispersed with respect to the aromatic polyetherketone resin (I), so that wear of the bearing and the shaft can be reduced.
  • polytetrafluoroethylene is used, a sufficient effect of reducing the amount of wear cannot be obtained.
  • the perfluoroethylenically unsaturated compound represented by the general formula (1) is selected from the group consisting of hexafluoropropylene, perfluoro (methyl vinyl ether), perfluoro (ethyl vinyl ether) and perfluoro (propyl vinyl ether). It is preferably at least one, and more preferably at least one selected from the group consisting of hexafluoropropylene and perfluoro (propyl vinyl ether).
  • the fluororesin (II) is preferably composed of 80 to 99 mol% of TFE and 1 to 20 mol% of a perfluoroethylenically unsaturated compound represented by the general formula (1).
  • the lower limit of the content of TFE constituting the fluororesin (II) is more preferably 85 mol%, further preferably 87 mol%, particularly preferably 90 mol%, and particularly preferably 93 mol%.
  • the upper limit of the content of TFE constituting the fluororesin (II) is more preferably 97 mol%, still more preferably 95 mol%.
  • the lower limit of the content of the perfluoroethylenically unsaturated compound represented by the general formula (1) constituting the fluororesin (II) is more preferably 3 mol%, further preferably 5 mol%.
  • the upper limit of the content of the perfluoroethylenically unsaturated compound represented by the general formula (1) constituting the fluororesin (II) is more preferably 15 mol%, further preferably 13 mol%, and more preferably 10 mol%. Is particularly preferred, with 7 mol% being even more preferred.
  • the fluororesin (II) preferably has a melt flow rate (MFR) measured under conditions of 372 ° C. and a load of 5000 g of 0.1 to 100 g / 10 minutes, preferably 10 to 40 g / 10 minutes. More preferred.
  • MFR melt flow rate
  • the more preferable lower limit of MFR is 12 g / 10 minutes, and the particularly preferable lower limit is 15 g / 10 minutes. Since the wear of the bearing and the shaft can be further reduced, the more preferable upper limit of MFR is 38 g / 10 minutes, and the particularly preferable upper limit is 35 g / 10 minutes.
  • the MFR of the fluororesin (II) is measured using a melt indexer according to ASTM D3307-01.
  • the melting point of the fluororesin (II) is not particularly limited, but it is preferable in molding that the fluororesin (II) is already melted at a temperature at which the aromatic polyetherketone resin (I) used in molding is melted.
  • the temperature is preferably not higher than the melting point of the aromatic polyether ketone resin (I).
  • the melting point of the fluororesin (II) is preferably 230 to 350 ° C.
  • the melting point of the fluororesin (II) is determined as a temperature corresponding to the maximum value in the heat of fusion curve when the temperature is raised at a rate of 10 ° C./min using a differential scanning calorimetry (DSC) apparatus.
  • DSC differential scanning calorimetry
  • the fluororesin (II) preferably has a melt viscosity of 0.3 to 3.0 kNsm -2 at 60 sec -1 and 390 ° C.
  • the melt viscosity is in the above range, the processing characteristics of the bearing are improved, and wear of the bearing and the shaft can be further reduced.
  • a more preferable lower limit of the melt viscosity is 0.4 kNsm -2 .
  • a more preferable upper limit of the melt viscosity is 2.0 kNsm- 2 .
  • the melt viscosity of the fluororesin (II) is measured according to ASTM D3835.
  • the fluororesin (II) may be treated with fluorine gas by a known method or may be treated with ammonia.
  • the melt viscosity ratio (I) / (II) between the aromatic polyether ketone resin (I) and the fluororesin (II) is 0.3 to 5.0.
  • the melt viscosity ratio (I) :( II) is preferably 0.4 to 4.0, and more preferably 0.5 to 3.0.
  • the melt viscosity ratio (I) / (II) is more preferably 0.5 to 2.5 from the viewpoint of more excellent wear resistance.
  • the mass ratio (I) :( II) of the aromatic polyether ketone resin (I) to the fluororesin (II) is preferably 95: 5 to 50:50.
  • the wear of the bearing and the shaft can be further reduced.
  • the content of the fluororesin (II) exceeds 50 by mass ratio with the aromatic polyetherketone resin (I)
  • the strength tends to be inferior, and if it is less than 5, the wear resistance and slidability. May be inferior.
  • a more preferred range is 90:10 to 60:40.
  • the fluororesin (II) is dispersed in the form of particles in the aromatic polyetherketone resin (I), the average dispersed particle size of the fluororesin (II) is 0.5 ⁇ m or less, and The maximum dispersed particle size is preferably 1.0 ⁇ m or less.
  • the fluororesin (II) dispersed in the aromatic polyetherketone resin (I) is dispersed with the average dispersed particle size and the maximum dispersed particle size within the above range, the wear of the bearing and the shaft can be further reduced. . If the average dispersed particle size is too large, there is a possibility that the bearing and shaft wear may not be sufficiently reduced.
  • the lower limit is not particularly limited, but may be 0.01 ⁇ m.
  • the average dispersed particle size of the fluororesin (II) is preferably 0.5 ⁇ m or less, more preferably 0.3 ⁇ m or less, and still more preferably 0.2 ⁇ m or less. When the average dispersed particle size is in the above range, the wear of the bearing and the shaft can be further reduced.
  • the lower limit of the average dispersed particle size is not particularly limited, but may be 0.01 ⁇ m.
  • the maximum dispersed particle size of the fluororesin (II) is preferably 1.0 ⁇ m or less, and more preferably 0.8 ⁇ m or less.
  • the average dispersed particle size and the maximum dispersed particle size of the fluororesin (II) are obtained by performing microscopic observation of the bearing of the present invention with a confocal laser microscope, or performing microscopic observation with a transmission electron microscope (TEM),
  • the obtained image can be obtained by binarizing with an optical analyzer.
  • the bearing of the present invention contains the aromatic polyether ketone resin (I) and the fluororesin (II), but may contain other components as necessary. Although it does not specifically limit as said other component, In order to improve abrasion resistance, you may contain an inorganic pigment.
  • the inorganic pigment is preferably stable even when baked, and examples thereof include titanium, iron oxide, and carbon powder.
  • the bearing of the present invention may contain carbon fiber, silicone oil, molybdenum disulfide and the like as other components.
  • the bearing of the present invention includes, for example, a step of preparing a resin composition containing an aromatic polyether ketone resin (I) and a fluororesin (II), and a step of molding the resin composition to obtain a bearing. It can be manufactured by a manufacturing method.
  • the method for preparing the resin composition is not particularly limited, and a mixer such as a compounding mill, a Banbury mixer, a pressure kneader, and an extruder that are usually used for mixing a resin composition such as a molding composition is used. And can be carried out under normal conditions. Since the average dispersed particle size of the fluororesin (II) can be reduced, the mixer is preferably a twin screw extruder, and particularly preferably a twin screw extruder having a screw configuration with a large L / D.
  • L / D is the effective length of the screw (L) / screw diameter (D).
  • a method for preparing the resin composition for example, a method in which the aromatic polyether ketone resin (I) and the fluororesin (II) are mixed in a molten state is preferable.
  • a resin composition having a desired dispersion state can be obtained by sufficiently kneading the aromatic polyether ketone resin (I) and the fluororesin (II). Since the dispersion state of the resin composition affects the obtained bearing and the wear of the shaft, the kneading method should be appropriately selected so that a desired dispersion state is obtained in the bearing.
  • the aromatic polyetherketone resin (I) and the fluororesin (II) are charged into a mixer at an appropriate ratio, and the other components are added as desired.
  • the method of manufacturing by melt-kneading above the melting points of (I) and (II) is preferred.
  • the resin composition may contain other components different from the aromatic polyether ketone resin (I) and the fluororesin (II).
  • the other components may be added to the aromatic polyether ketone resin (I) and the fluororesin (II) in advance and mixed, or the aromatic polyether ketone resin (I) and the fluororesin (II). You may add when mix
  • the temperature at the time of the melt kneading may be appropriately set depending on the kind of the aromatic polyetherketone resin (I) and the fluororesin (II) to be used, but it is preferably, for example, 360 to 400 ° C.
  • the kneading time is usually 1 minute to 1 hour.
  • a method for obtaining the bearing by molding the resin composition is not particularly limited, and various conditions can be used as conventionally known.
  • the bearing of the present invention is preferably formed by injection molding or extrusion molding. From the viewpoint of productivity, it is more preferably formed by injection molding. Moreover, you may cut the round bar obtained by extrusion molding, or the block obtained by injection molding, and may obtain the bearing of this invention.
  • the temperature for forming the bearing of the present invention is usually preferably a temperature equal to or higher than the melting point of the aromatic polyetherketone resin (I) used.
  • the molding temperature is preferably a temperature lower than the lower one of the decomposition temperature of the fluororesin (II) and the decomposition temperature of the aromatic polyether ketone resin (I).
  • Such a molding temperature may be 250 to 400 ° C., for example.
  • the sliding member has a melt viscosity ratio (I) / (II) between the aromatic polyether ketone resin (I) and the fluororesin (II) of 0.3 to 5.0.
  • the sliding member wears due to contact with the shaft or contact between the sliding members, and is composed of an aromatic polyetherketone resin (I) and a fluororesin (II). Resin (I) and resin (II ) Is in the above specific range, it is possible to reduce the wear of the sliding member constituting the rolling bearing.
  • the said sliding member is formed from the resin composition containing aromatic polyether ketone resin (I) and fluororesin (II).
  • the sliding member only needs to be formed from the above resin composition at least a part of the sliding member, and is superior to the conventional sliding member even when only a part is formed from the resin composition. Although it exhibits wear resistance, it is preferable that the entire sliding member is formed only from the above resin composition because it exhibits further excellent wear resistance.
  • the rolling bearing of the present invention normally supports a shaft that rotates or linearly moves, and holds the motion and acting load.
  • the shaft supported by the rolling bearing of the present invention is not particularly limited, and examples thereof include aluminum, steel, stainless steel, and alloys thereof.
  • rolling bearing of the present invention examples include ball bearings and roller bearings. Further, the rolling bearing of the present invention may be a radial bearing or a thrust bearing.
  • the rolling bearing according to the present invention includes a race and a rolling element, and further includes a cage if necessary. More specifically, an inner ring having an inner ring raceway on an outer peripheral surface, an outer ring having an outer ring raceway on an inner peripheral surface, a plurality of rolling elements provided so as to be able to roll between inner and outer ring raceways, And a cage that guides and holds the rolling elements between the raceways of the inner and outer rings.
  • the track ring is an inner ring or an outer ring.
  • the sliding member is a member constituting a rolling bearing, and is a member that rotates or contacts a rotating member or shaft.
  • Examples of the sliding member include a race, a rolling element, and a cage.
  • the sliding member is preferably at least one selected from the group consisting of a race, a rolling element, and a cage.
  • the rolling element is preferably a ball or a roller.
  • the inner ring and outer ring those having a suitable shape may be used depending on the type of rolling bearing.
  • the said retainer should just use the thing suitable for the shape etc. of a rolling element, for example, the shape formed by connecting a some circular-arc-shaped member in ring shape is mentioned.
  • At least one selected from the group consisting of a race, a rolling element, and a cage is composed of an aromatic polyether ketone resin (I) and a melt processable fluororesin (II). If so, any of the race ring, the rolling element, and the cage may be made of other resin or may be made of metal, and is not particularly limited.
  • the rolling bearing may include a spring or the like in addition to the race, the rolling element, and the cage.
  • the sliding member is a cage. Cage wear by using a cage consisting of an aromatic polyetherketone resin (I) and a fluororesin (II) and having a melt viscosity ratio between the resin (I) and the resin (II) in the above specific range. And the abrasion of the rolling element caused by rubbing against the cage is suppressed.
  • FIG. 1 is a schematic cross-sectional view showing an example of a ball bearing.
  • the ball bearing 10 is provided on the outer periphery of the shaft 15.
  • the ball bearing 10 has an inner ring 11 and an outer ring 12, and has a ball 13 between the inner ring 11 and the outer ring 12.
  • the ball 13 is held by a cage 14. Since the sliding members such as the inner ring 11, the outer ring 12, the ball 13, and the cage 14 rotate or contact the rotating member, excellent wear resistance is required on their contact surfaces.
  • at least one of these sliding members is composed of the aromatic polyether ketone resin (I) and the fluororesin (II), thereby suppressing the wear of the sliding member. it can.
  • the sliding member can be prevented from being worn.
  • a composition containing the aromatic polyether ketone resin (I) and the fluororesin (II) the sliding member can be prevented from being worn.
  • a core made of another material other resin, metal, etc.
  • an aromatic polyetherketone resin (I) and a fluororesin (II) are used.
  • the resin (II) have a shell part whose melt viscosity ratio is in the above specific range, the wear of the sliding member can be suppressed.
  • the sliding member may include a core portion made of another material.
  • the aromatic polyether ketone resin (I) is preferably at least one selected from the group consisting of polyether ketone, polyether ether ketone, polyether ketone ketone and polyether ketone ether ketone ketone, More preferably, it is at least one selected from the group consisting of ether ketones and polyether ether ketones, and more preferably polyether ether ketones.
  • the aromatic polyether ketone resin (I) preferably has a melt viscosity of 0.25 to 1.50 kNsm ⁇ 2 at 60 sec ⁇ 1 and 390 ° C.
  • the melt viscosity is in the above range, the processing characteristics are improved, and the rolling bearing of the present invention suppresses the wear of the sliding member.
  • a more preferred lower limit for the melt viscosity is 0.80 kNsm -2 .
  • a more preferable upper limit of the melt viscosity is 1.30 kNsm ⁇ 2 .
  • the melt viscosity of the aromatic polyether ketone resin (I) is measured according to ASTM D3835.
  • the aromatic polyether ketone resin (I) preferably has a glass transition temperature of 130 ° C. or higher. More preferably, it is 135 degreeC or more, More preferably, it is 140 degreeC or more. When the glass transition temperature is in the above range, a bearing having excellent heat resistance can be obtained. The glass transition temperature is measured by a differential scanning calorimetry (DSC) apparatus.
  • DSC differential scanning calorimetry
  • the aromatic polyether ketone resin (I) preferably has a melting point of 300 ° C. or higher. More preferably, it is 320 degreeC or more. When the melting point is within the above range, the heat resistance of the obtained bearing can be improved. The melting point is measured by a differential scanning calorimetry (DSC) apparatus.
  • DSC differential scanning calorimetry
  • the rolling bearing of the present invention suppresses the wear of the sliding member.
  • the fluororesin (II) is efficiently dispersed in the aromatic polyetherketone resin (I) by using the fluororesin (II)
  • the rolling bearing of the present invention suppresses the wear of the sliding member.
  • the perfluoroethylenically unsaturated compound represented by the general formula (1) is selected from the group consisting of hexafluoropropylene, perfluoro (methyl vinyl ether), perfluoro (ethyl vinyl ether) and perfluoro (propyl vinyl ether). It is preferably at least one, and more preferably at least one selected from the group consisting of hexafluoropropylene and perfluoro (propyl vinyl ether).
  • the fluororesin (II) is preferably composed of 87 to 99 mol% of TFE and 1 to 13 mol% of a perfluoroethylenically unsaturated compound represented by the general formula (1). More preferably, it is composed of 90 to 99 mol% of TFE and 1 to 10 mol% of a perfluoroethylenically unsaturated compound represented by the above general formula (1). More preferred is a fluororesin composed of 93 to 99 mol% of TFE and 1 to 7 mol% of a perfluoroethylenically unsaturated compound represented by the above general formula (1).
  • the fluororesin (II) preferably has a melt flow rate (MFR) measured under conditions of 372 ° C. and a load of 5000 g of 0.1 to 100 g / 10 minutes, preferably 10 to 40 g / 10 minutes. More preferred.
  • MFR melt flow rate
  • the more preferable lower limit of MFR is 12 g / 10 minutes, and the particularly preferable lower limit is 15 g / 10 minutes.
  • the more preferable upper limit of MFR is 38 g / 10 minutes, and the particularly preferable upper limit is 35 g / 10 minutes.
  • the melting point of the fluororesin (II) is not particularly limited, but it is preferable in molding that the fluororesin (II) is already melted at a temperature at which the aromatic polyetherketone resin (I) used in molding is melted.
  • the temperature is preferably not higher than the melting point of the aromatic polyether ketone resin (I).
  • the melting point of the fluororesin (II) is preferably 230 to 350 ° C.
  • the fluororesin (II) preferably has a melt viscosity of 0.3 to 3.0 kNsm -2 at 60 sec -1 and 390 ° C.
  • the melt viscosity is in the above range, the processing characteristics are improved and wear of the sliding member is suppressed.
  • a more preferable lower limit of the melt viscosity is 0.4 kNsm -2 .
  • a more preferable upper limit of the melt viscosity is 2.0 kNsm- 2 .
  • the melt viscosity of the fluororesin (II) is measured according to ASTM D3835.
  • the fluororesin (II) may be treated with fluorine gas by a known method or may be treated with ammonia.
  • the sliding member has a melt viscosity ratio (I) / (II) of the aromatic polyether ketone resin (I) and the fluororesin (II) of 0.3 to 5.0.
  • the melt viscosity ratio (I) :( II) is preferably 0.4 to 4.0, and more preferably 0.5 to 3.0.
  • the melt viscosity ratio (I) / (II) is more preferably 0.5 to 2.5 from the viewpoint of more excellent wear resistance.
  • the sliding member preferably has a mass ratio (I) :( II) of the aromatic polyether ketone resin (I) to the fluororesin (II) of 95: 5 to 50:50.
  • a mass ratio (I) :( II) of the aromatic polyether ketone resin (I) to the fluororesin (II) of 95: 5 to 50:50.
  • the fluororesin (II) is dispersed in the form of particles in the aromatic polyetherketone resin (I), the average dispersed particle diameter of the fluororesin (II) is 0.5 ⁇ m or less, and The maximum dispersed particle size is preferably 1.0 ⁇ m or less.
  • the lower limit is not particularly limited, but may be 0.01 ⁇ m.
  • the average dispersed particle size of the fluororesin (II) is preferably 0.5 ⁇ m or less, more preferably 0.3 ⁇ m or less, and still more preferably 0.2 ⁇ m or less. When the average dispersed particle size is in the above range, wear of the sliding member is suppressed.
  • the lower limit of the average dispersed particle size is not particularly limited, but may be 0.01 ⁇ m.
  • the maximum dispersed particle size of the fluororesin (II) is preferably 1.0 ⁇ m or less, and more preferably 0.8 ⁇ m or less.
  • the average dispersed particle size and maximum dispersed particle size of the fluororesin (II) are determined by observing the sliding member with a transmission electron microscope (TEM) and binarizing the obtained image with an optical analyzer. It can ask for.
  • TEM transmission electron microscope
  • the said sliding member contains aromatic polyether ketone resin (I) and fluororesin (II), it may contain the other component as needed. Although it does not specifically limit as said other component, In order to improve abrasion resistance, you may contain an inorganic pigment.
  • the inorganic pigment is preferably stable even when baked, and examples thereof include titanium, iron oxide, and carbon powder.
  • the sliding member may include carbon fiber, silicone oil, molybdenum disulfide, and the like as other components.
  • the sliding member includes, for example, a step of preparing a resin composition containing an aromatic polyether ketone resin (I) and a fluororesin (II), a step of forming the resin composition to obtain a sliding member, It can manufacture with the manufacturing method containing.
  • the method for preparing the resin composition is not particularly limited, and a mixer such as a compounding mill, a Banbury mixer, a pressure kneader, and an extruder that are usually used for mixing a resin composition such as a molding composition is used. And can be carried out under normal conditions.
  • a twin screw extruder is preferable, and a twin screw extruder having a screw structure with a large L / D is particularly preferable.
  • L / D is the effective length of the screw (L) / screw diameter (D).
  • a method for preparing the resin composition for example, a method in which the aromatic polyether ketone resin (I) and the fluororesin (II) are mixed in a molten state is preferable.
  • a resin composition having a desired dispersion state can be obtained by sufficiently kneading the aromatic polyether ketone resin (I) and the fluororesin (II). Since the dispersion state of the resin composition affects the wear of the resulting sliding member, the kneading method should be appropriately selected so that a desired dispersion state can be obtained in the sliding member.
  • the aromatic polyetherketone resin (I) and the fluororesin (II) are charged into a mixer at an appropriate ratio, and the other components are added as desired.
  • the method of manufacturing by melt-kneading above the melting points of (I) and (II) is preferred.
  • the resin composition may contain other components different from the aromatic polyether ketone resin (I) and the fluororesin (II).
  • the other components may be added to the aromatic polyether ketone resin (I) and the fluororesin (II) in advance and mixed, or the aromatic polyether ketone resin (I) and the fluororesin (II). You may add when mix
  • the temperature at the time of the melt kneading may be appropriately set depending on the kind of the aromatic polyetherketone resin (I) and the fluororesin (II) to be used, but it is preferably, for example, 360 to 400 ° C.
  • the kneading time is usually 1 minute to 1 hour.
  • a method for obtaining the sliding member by molding the resin composition is not particularly limited, and various conditions can be used as conventionally known.
  • the sliding member is preferably formed by injection molding or extrusion molding. From the viewpoint of productivity, it is more preferably formed by injection molding. Further, the sliding member may be obtained by cutting a round bar obtained by extrusion molding or a block obtained by injection molding.
  • the temperature at which the sliding member is molded is preferably equal to or higher than the melting point of the aromatic polyetherketone resin (I) used.
  • the molding temperature is preferably a temperature lower than the lower one of the decomposition temperature of the fluororesin (II) and the decomposition temperature of the aromatic polyether ketone resin (I).
  • Such a molding temperature may be 250 to 400 ° C., for example.
  • melt viscosity of the aromatic polyetherketone resin was measured at 60 sec ⁇ 1 and 390 ° C. according to ASTM D3835.
  • the melt viscosity of the fluororesin was measured at 60 sec ⁇ 1 and 390 ° C. in accordance with ASTM D3835.
  • Aromatic polyether ketone resin (1) Polyether ether ketone (melt viscosity; 1.19 kNsm ⁇ 2 )
  • Aromatic polyetherketone resin (2) polyetheretherketone (melt viscosity; 0.31 kNsm ⁇ 2 )
  • MFR 23 g / 10 min.
  • Fluororesin (3) Polytetrafluoroethylene (trade name: Lubron L5, manufactured by Daikin Industries, Ltd.)
  • Fluororesin (4) ethylene / tetrafluoroethylene copolymer (trade name: NEOFLON EP541, manufactured by Daikin Industries, Ltd., melt viscosity; 2.27 kNsm ⁇ 2 )
  • a resin composition (pellet) was produced by melt-kneading under conditions of a temperature of 390 ° C. and a screw rotation speed of 300 rpm.
  • FIG. 3A shows a front view of the obtained radial bearing (test bearing), and FIG. 3B shows a side view.
  • the obtained radial bearing (test bearing) was tested using a bearing endurance tester shown in FIG.
  • a bearing endurance test was conducted with A5056 (aluminum alloy, Ra-0.8 ⁇ m, ⁇ 31.985 mm), and the weight retention rate of the bearing and the shaft before and after the test was measured. The results are shown in Table 1.
  • 41 is a load cell
  • 42 and 46 are bearings
  • 30 is a radial bearing (test bearing)
  • 44 is a bearing fixing jig
  • 45 is an aluminum shaft
  • 47 is a passive gear
  • 48 is A driving gear 49 is a motor.
  • Example 1 the bearing was shape
  • the average dispersed particle size and the maximum dispersed particle size of the fluororesin (1) were calculated.
  • a bearing durability test was conducted under the same conditions as in Examples 1 and 2 except that the obtained bearing was used. The results are shown in Table 1.
  • a resin composition (pellet) was produced by melt-kneading under conditions of a temperature of 390 ° C. and a screw rotation speed of 300 rpm.
  • Example 1 the bearing was shape
  • the average dispersed particle size and the maximum dispersed particle size of the fluororesin (2) were calculated.
  • a bearing durability test was conducted under the same conditions as in Examples 1 and 2 except that the obtained bearing was used. The results are shown in Table 1.
  • Ball bearing 11 Inner ring 12: Outer ring 13: Ball 14: Cage 15: Shaft 20, 27: Sliding bearing 21, 26: Shaft 28: Reinforcement material 30: Radial bearing (test bearing) 41: Load cell 42, 46: Bearing 44: Bearing fixing jig 45: Aluminum shaft 47: Passive gear 48: Drive gear 49: Motor

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Sliding-Contact Bearings (AREA)
  • Rolling Contact Bearings (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

Le but de la présente invention est de fournir un palier présentant une excellente résistance à l'abrasion et capable de réduire l'abrasion de l'arbre. La présente invention concerne ainsi un palier formé à partir d'une composition de résine contenant une résine de polyéther cétone aromatique (I) et une résine fluorée (II), et est caractérisée en ce que la résine fluorée (II) consiste en un copolymère de tétrafluoroéthylène ainsi qu'en un composé perfluoré à insaturation éthylénique représenté par la formule générale (1) : CF2=CF-Rf1 (1) (Dans la formule, Rf1 représente -CF3 ou -ORf2. Rf2 représente un groupe perfluoroalkyle ayant de 1 à 5 atomes de carbone.) Le palier est en outre caractérisé en ce que le rapport de viscosité à l'état fondu, (I) / (II), entre la résine de polyéther cétone aromatique (I) et la résine fluorée (II) est situé dans la plage comprise entre 0,3 et 5,0.
PCT/JP2012/080923 2011-12-13 2012-11-29 Palier et palier à roulement WO2013088965A1 (fr)

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WO2014024671A1 (fr) * 2012-08-06 2014-02-13 ダイキン工業株式会社 Composition de résine et article moulé
WO2015012346A1 (fr) * 2013-07-25 2015-01-29 ダイキン工業株式会社 Composition de résine thermoplastique et article moulé à base de celle-ci
CN105061956A (zh) * 2015-07-30 2015-11-18 洛阳轴研科技股份有限公司 一种聚醚醚酮改性聚四氟乙烯复合材料、轴承保持架及其制备方法
JP6208817B1 (ja) * 2016-06-03 2017-10-04 株式会社カジワラ 撹拌装置
US11024441B2 (en) 2011-12-14 2021-06-01 Daikin Industries, Ltd. Insulated wire
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US11024441B2 (en) 2011-12-14 2021-06-01 Daikin Industries, Ltd. Insulated wire
WO2014024671A1 (fr) * 2012-08-06 2014-02-13 ダイキン工業株式会社 Composition de résine et article moulé
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JP6208817B1 (ja) * 2016-06-03 2017-10-04 株式会社カジワラ 撹拌装置
JP2017217577A (ja) * 2016-06-03 2017-12-14 株式会社カジワラ 撹拌装置
WO2023042492A1 (fr) * 2021-09-14 2023-03-23 日本トムソン株式会社 Palier suiveur

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