WO2020038263A1 - Conductive self-lubricating composite plate for bearing - Google Patents

Conductive self-lubricating composite plate for bearing Download PDF

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WO2020038263A1
WO2020038263A1 PCT/CN2019/100580 CN2019100580W WO2020038263A1 WO 2020038263 A1 WO2020038263 A1 WO 2020038263A1 CN 2019100580 W CN2019100580 W CN 2019100580W WO 2020038263 A1 WO2020038263 A1 WO 2020038263A1
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lubricating film
conductive self
carbon
weight ratio
fluoropolymer
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PCT/CN2019/100580
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French (fr)
Chinese (zh)
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张蓉平
孙志华
陆忠泉
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浙江长盛滑动轴承股份有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/06—Elements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
    • 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
    • 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
    • C08L27/16—Homopolymers or copolymers or vinylidene fluoride
    • 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 invention belongs to the technical field of sliding bearings, in particular to a conductive self-lubricating film for bearings used on sliding bearings and a preparation method thereof.
  • the maintenance-free sliding bearing with a layer structure has long been known to those skilled in the art through various forms, and is applied to multiple technical fields, such as automobiles Engineering.
  • Patent No. 200910175267.3 discloses a solid lubricating composite material and a manufacturing method thereof.
  • the solid lubricating composite material contains carbon nanotubes, boron oxide, and polytetrafluoroethylene.
  • the solid lubricating composite material is prepared by combining carbon nanotubes with self-lubricating polytetrafluoroethylene, which greatly improves the technical indexes of low friction coefficient, self-lubricity, abrasion resistance, etc. Static electricity due to friction.
  • the resistance value of the solid lubricating composite material is generally between 10 9 ohm square centimeters and 1012 ohm square centimeters, which does not meet the requirements of the electrophoresis process.
  • the ohm square centimeter is a unit of resistivity obtained by a certain detection method.
  • R A R * A
  • the resistance value of the material required for the electrophoresis process is generally below 10 6 ohms per square centimeter, it is obvious that the material disclosed in this patent does not meet the requirements, which is related to its application, because the material disclosed in patent number 200910175267.3 The purpose of conducting is to eliminate and reduce the static electricity generated by friction, not to apply to electrophoresis process.
  • the material disclosed by patent number 200910175267.3 does not have the requirements of practical engineering applications, because in engineering practical applications, such as for bearings, the materials must have good mechanical properties, creep resistance, and lower The resistance value. Because it has good mechanical properties, it can be made into a thin film by turning.
  • the present invention provides a conductive self-lubricating film with good mechanical properties, creep resistance, and lower resistance value, and a preparation method thereof to meet the above requirements.
  • a conductive self-lubricating film for bearings which is used in an electrophoresis process, is characterized in that the conductive self-lubricating film for bearings is mainly composed of fluoropolymer, carbon black, carbon nanotubes, carbon fibers, and solid lubricants.
  • the polymer is selected from one or more of fluoropolymers, and its weight ratio is 70% to 80%, the weight ratio of carbon black is 4% to 5%, and the weight ratio of the carbon nanotubes is 1% to 2%, the weight ratio of the carbon fibers is 15% to 20%, the weight ratio of the solid lubricant is 0 to 9%, and the length of the carbon nanotubes is 3 ⁇ m to 5 ⁇ m.
  • the polymer is selected from the group consisting of polytetrafluoroethylene, fluorinated ethylene-propylene, polyvinylidene fluoride, polychlorotrifluoroethylene, ethylenechlorotrifluoroethylene, perfluoroalkoxy polymers, and their combination.
  • the fluoropolymer is perfluoroalkoxyethylene, modified tetrafluoroethylene-hexafluoropropylene, modified perfluoroalkoxyethylene, ethylene-tetrafluoroethylene, tetrafluoroethylene-perfluoro, modified Teflon, polyvinylidene fluoride, ethylene-chlorotrifluoroethylene.
  • the thickness of the conductive self-lubricating film for the bearing is 0.1 mm to 0.5 mm.
  • the solid lubricant is selected from glass fiber, carbon fiber, silicon, graphite, polyetheretherketone, molybdenum disulfide, aromatic polyester, carbon particles, bronze, fluoropolymer, thermoplastic filler, mineral filler, And any combination of them.
  • the fluoropolymer accounts for at least 72%, 78%, or 80% of the weight of the conductive self-lubricating film.
  • a method for preparing a conductive self-lubricating film for a bearing includes the following steps:
  • S1 Provide carbon black and carbon nanotubes.
  • the weight ratio of the carbon black is 4% to 5%, and the weight ratio of the carbon nanotubes is 1% to 2%.
  • the carbon black and the carbon nanotubes are dispersed using an ultrasonic dispersion method. In liquid medium
  • S2 Provide carbon fiber, solid lubricant, and fluoropolymer.
  • the weight ratio of the carbon fiber is 15% to 20%.
  • the weight ratio of the solid lubricant is 0 to 9%.
  • the weight ratio of the fluoropolymer is 70%. ⁇ 80%, and the carbon fiber, the solid lubricant and the fluoropolymer are evenly mixed together at a low temperature to form a fluoropolymer mixture;
  • liquid medium is a glycol solution.
  • the low temperature range is lower than 19 degrees.
  • the thickness of the conductive self-lubricating film is 0.1 mm to 0.5 mm.
  • the conductive self-lubricating film provided by the present invention uses carbon black and carbon nanotubes in mixed use, which reduces the cost of the overall material and is conducive to popularization.
  • the ratio of the tube and the carbon fiber forms a good conductive network in the conductive self-lubricating film on a microscopic basis, so that the conductive self-lubricating film has a resistance value of less than 103 ohm square centimeters on the macro scale, and due to the presence of carbon fibers, the conductive The self-lubricating film has good mechanical properties and creep resistance, so that the conductive self-lubricating material is suitable for turning to prepare a film with a thickness that meets requirements.
  • FIG. 1 is a schematic structural diagram of a conductive self-lubricating film for a bearing provided by the present invention.
  • FIG. 2 is a flowchart of manufacturing the conductive self-lubricating film of FIG. 1.
  • FIG. 1 it is a schematic structural diagram of a conductive self-lubricating film for bearings provided by the present invention.
  • the conductive self-lubricating film for bearings is mainly composed of fluoropolymer 10, carbon black 11, carbon nanotubes 12, carbon fibers 13, and solid lubricant 14. It is conceivable that according to actual performance requirements, the conductive self-lubricating film for bearings may further include other materials, such as fillers and the like.
  • the fluoropolymer 10 is a fluorine-containing polymer, which may be selected from one or more kinds of the fluorine-containing polymer.
  • the fluorine-containing polymer may be polytetrafluoroethylene (PTFE), fluorinated ethylene-propylene (FEP), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), ethylene chlorotrifluoroethylene (ECTFE), perfluoroalkoxy polymers (PFA), or any combination thereof.
  • PTFE polytetrafluoroethylene
  • FEP fluorinated ethylene-propylene
  • PVDF polyvinylidene fluoride
  • PCTFE polychlorotrifluoroethylene
  • ECTFE ethylene chlorotrifluoroethylene
  • PFA perfluoroalkoxy polymers
  • the fluorine-containing polymer may also be perfluoroalkoxyethylene, modified tetrafluoroethylene-hexafluoropropylene, modified perfluoroalkoxyethylene, ethylene-tetrafluoroethylene, tetrafluoroethylene-perfluoro, modified One or more of polytetrafluoroethylene, polyvinylidene fluoride, and ethylene-chlorotrifluoroethylene.
  • the weight ratio of the fluoropolymer 10 is 70% to 80%.
  • the fluoropolymer 10 accounts for at least 72%, 78%, or 80% of the weight of the conductive self-lubricating film for bearings, and the fluoropolymer 10 is polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the carbon black 11 generally refers to carbon simple particles, which will detach from molecules to form carbon black 11 when the carbon element is not sufficiently burned.
  • the arrangement of carbon atoms is similar to graphite, forming a hexagonal plane. Usually 3 to 5 such layers form a microcrystal. Because of the arrangement of carbon atoms in each graphite layer of carbon black 11 microcrystals, It is ordered, and the arrangement of carbon atoms between adjacent layers is disordered, so it is also called quasi-graphite crystal.
  • the group and the matrix have a large polarity and an enhanced effect. At this time, the strength increases, but it prevents the conductive particles from aggregating themselves, resulting in poor conductivity.
  • the weight ratio of carbon black 11 is 4% to 5%.
  • the content of the carbon black 11 is 4.5% by weight.
  • the carbon nanotubes 12 can be regarded as a seamless nano-scale tube made of a single or multi-layer graphite sheet rolled around a central axis at a certain spiral angle, and has a seamless hollow tubular structure.
  • the tube body consists of six sides. Shaped carbon atoms are surrounded by a grid, and the two ends are usually regarded as two hemispherical large fullerene molecules.
  • the diameter of single-walled carbon nanotubes is relatively thin, generally ranging from a few nanometers to a dozen nanometers.
  • the carbon nanotubes 12 have good electrical conductivity. Since the structure of the carbon nanotubes 12 is the same as the sheet structure of graphite, they have good electrical properties.
  • the theoretical prediction of its electrical conductivity depends on its pipe diameter and the helix angle of the pipe wall.
  • the diameter of CNTs is greater than 6nm, the conductivity is reduced; when the diameter of CNTs is less than 6nm, CNTs can be regarded as one-dimensional quantum wires with good conductivity.
  • the weight ratio of the carbon nanotubes 12 is 1% to 2%.
  • the content of the carbon nanotubes 12 is 1.5% by weight.
  • the length of the carbon nanotubes 12 should be 3 ⁇ m to 5 ⁇ m to improve the conductivity uniformity.
  • the length of the carbon nanotubes 12 can reach the centimeter line, if it is too long, the uniformity of dispersion during the mixing process will be reduced, which will reduce the uniformity of its electrical conductivity, and further reduce its electrophoretic effect in the electrophoresis process, that Defects of varying thickness.
  • the carbon fiber 13 is a new fiber material with high strength and high modulus fiber with a carbon content of 95% or more. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystals along the axial direction of the fiber and subjecting them to carbonization and graphitization. Carbon fiber 13 is "flexible outside and rigid inside”. It is lighter than metal aluminum, but its strength is higher than steel, and it has the characteristics of corrosion resistance and high modulus.
  • Carbon fiber 13 also has many properties, such as low density, high specific performance, no creep, resistance to ultra-high temperature in non-oxidizing environment, good fatigue resistance, specific heat and electrical conductivity between non-metal and metal, and low thermal expansion coefficient It also has anisotropy, good corrosion resistance, and good X-ray transmission. Good electrical and thermal conductivity, good electromagnetic shielding.
  • the weight ratio of the carbon fiber 13 is 15% to 20%.
  • the content of the carbon fiber 13 is 18% by weight.
  • the solid lubricant 14 is selected from glass fibers, silicon, graphite, polyetheretherketone, molybdenum disulfide, aromatic polyesters, carbon particles, bronze, thermoplastic fillers, mineral fillers, and any combination thereof.
  • the role of the solid lubricant is to reduce friction.
  • the solid lubricant 14 is molybdenum disulfide, and its weight ratio is 0-9%.
  • FIG. 2 is a flowchart of a method for preparing the conductive self-lubricating film for a bearing.
  • the method for preparing the conductive self-lubricating film for a bearing includes the following steps:
  • S1 Provide carbon black 11 and carbon nanotubes 12, the weight ratio of the carbon black 11 is 4% to 5%, the weight ratio of the carbon nanotubes 12 is 1% to 2%, and the carbon black 11 and the carbon nanotubes are provided. 12Using ultrasonic dispersion method to disperse in liquid medium;
  • S2 Provide a carbon fiber 13, a solid lubricant, and a fluoropolymer 10.
  • the weight ratio of the carbon fiber 13 is 15% to 20%.
  • the weight ratio of the solid lubricant is 0 to 9%.
  • the weight of the fluoropolymer 10 The ratio is 70% to 80%, and the carbon fiber 13, the solid lubricant and the fluoropolymer 10 are uniformly mixed together at a low temperature to form a fluoropolymer mixture;
  • the liquid medium may be a solution containing ethylene glycol, and in this embodiment, the ratio is 15% -25% wt.
  • step S2 the temperature should be controlled below 19 ° C, preferably 10 ° C.
  • step S3 when the solution of the carbon black 11 and the carbon nanotubes 12 is sprayed, the fluoropolymer mixture should also be stirred to make the billet uniformly mixed.
  • a conductive self-lubricating film for bearings having a thickness of 0.1 mm to 0.5 mm can be manufactured by turning.
  • the thickness of the conductive self-lubricating film for the bearing is 0.2 mm.
  • the conductive self-lubricating film provided by the present invention uses carbon black and carbon nanotubes in mixed use, which reduces the cost of the overall material and is conducive to promotion and use.
  • the ratio of the tube and the carbon fiber forms a good conductive network in the conductive self-lubricating film on a microscopic level, so that the conductive self-lubricating film has a resistance value of less than 103 ohm square centimeters on the macro level.
  • the conductive self-lubricating film has good mechanical properties and creep resistance, so that the conductive self-lubricating material is suitable for turning to prepare a film with a thickness that meets requirements.

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Abstract

A conductive self-lubricating film for a bearing and a preparation method thereof. The conductive self-lubricating film for a bearing is used in an electrophoretic process, and mainly consists of a fluoropolymer (10), carbon black (11), carbon nanotubes (12), carbon fibers (13), and a solid lubricant (14). A polymer is selected from one or more type of the fluoropolymer (10), and a weight ratio thereof is 70-80%. A weight ratio of the carbon black (11) is 4-5%, a weight ratio of the carbon nanotubes (12) is 1-2%, a weight ratio of the carbon fibers (13) is 15-20%, and a weight ratio of the solid lubricant (14) is 0-9%. The length of the carbon nanotubes (12) is 3 μm to 5 μm. A mix of the carbon black (11) and the carbon nanotubes (12) is used in the conductive self-lubricating film, thereby reducing overall material costs and facilitating promotion and use thereof. The ratios of the carbon black (11), the carbon nanotubes (12), and the carbon fibers (13) are configured to microscopically form a favorable conductive network in the conductive self-lubricating film, such that macroscopically, the conductive self-lubricating film has a resistance value less than 103 ohm per square centimeter, and is applicable to an electrophoretic process.

Description

[根据细则26改正15.10.2019]　一种轴承用导电自润滑复合板[Correct 15.10.2019 according to Rule 26] A conductive self-lubricating composite plate for bearings 技术领域Technical field
本发明属于滑动轴承技术领域，特别是一种使用在滑动轴承上的轴承用导电自润滑膜及其制备方法。The invention belongs to the technical field of sliding bearings, in particular to a conductive self-lubricating film for bearings used on sliding bearings and a preparation method thereof.
背景技术Background technique
具有层结构(包括金属支承体材料及施加于其上的中间层和滑动层)的免维护滑动轴承早已通过多种形式为本领域技术人员所习知，并应用于多个技术领域，例如汽车工程领域。The maintenance-free sliding bearing with a layer structure (including a metal support material and an intermediate layer and a sliding layer applied thereto) has long been known to those skilled in the art through various forms, and is applied to multiple technical fields, such as automobiles Engineering.
但是目前随着汽车工业的发展，其集成度也越来越高，那些应用于汽车车门铰链、座椅铰链、前后盖铰链等低速中等载荷场合中的自润滑轴承，除了手感要求舒适，无噪声的要求外，还要求其具有导电性能的要求。该导电性能的要求原自汽车工业的要求。因为先进的汽车涂装特别是轿车涂装技术和设备在我国得以快速应用。为了满足客户对汽车涂装组件表面处理工艺即电泳涂装的需求，对汽车铰链部位的铰链轴承专门提出了导电性能的要求，因此对该应用的自润滑轴承的功能层的要求则至少包括扭矩恒定，有弹性，自润滑与具有导电性能。However, with the development of the automotive industry, its integration is getting higher and higher. Self-lubricating bearings that are used in low-speed and medium-load applications such as door hinges, seat hinges, and front and rear cover hinges require comfortable and noise-free bearings In addition to the requirements of electrical conductivity. This requirement for electrical conductivity is originally a requirement of the automotive industry. Because advanced car painting technology, especially car painting technology and equipment, can be quickly applied in China. In order to meet the customer's needs for the surface treatment process of automotive coating components, that is, electrophoretic coating, the conductive performance requirements of the hinge bearing of the automobile hinge portion are specifically required, so the functional layer requirements of the self-lubricating bearing for this application include at least torque Constant, elastic, self-lubricating and conductive.
专利号为200910175267.3的专利公开了一种固体润滑复合材料及制作方法。该固体润滑复合材料含有碳纳米管、氧化硼、聚四氟乙烯。通过将碳纳米管与具有自润滑性的聚四氟乙烯结合制备固体润滑复合材料，其使得低摩擦系数，自润滑性，耐磨性等技术指标大幅度提高并且可导热导电，还减少和消除因摩擦产生的静电。但是，经检测，该固体润滑复合材料的电阻值一般在10 9欧姆平方厘米至1012欧姆平方厘米之间，其不符合电泳工艺的要求。需要解释的是，欧姆平方厘米是由某种的检测方式下得到的电阻率单位。该种检测方法在将一定的压力对导电体进行施压时使用万用表检测到的该导电体的电阻值R，通过换算得到该电阻率R A,即R A＝R*A，其中，R A为电阻率，R为所测到的电阻值，A为该被测导电体的面积。因此R A的单位即为欧姆平方厘米。当然可以想到的是，还可以为欧姆平方米等。因为电泳工艺所要求的材料的电阻值一般在10 6每平方 厘米欧姆以下，明显该专利所公开的材料是不符合要求，这与它的应用场合有关系，因为专利号为200910175267.3所公开的材料的导电目的是为了消除和减小因摩擦产生的静电，而不是应用于电泳工艺。另外，专利号为200910175267.3所公开的材料也不具有实际工程应用的要求，因为在工程实际应用中，比如用于轴承，该材料要求必须具有很好的力学性能，抗蠕变性能，以及更低的电阻值。因为有很好的力学性能才能通过车削制成厚度很小膜， Patent No. 200910175267.3 discloses a solid lubricating composite material and a manufacturing method thereof. The solid lubricating composite material contains carbon nanotubes, boron oxide, and polytetrafluoroethylene. The solid lubricating composite material is prepared by combining carbon nanotubes with self-lubricating polytetrafluoroethylene, which greatly improves the technical indexes of low friction coefficient, self-lubricity, abrasion resistance, etc. Static electricity due to friction. However, after testing, the resistance value of the solid lubricating composite material is generally between 10 9 ohm square centimeters and 1012 ohm square centimeters, which does not meet the requirements of the electrophoresis process. It should be explained that the ohm square centimeter is a unit of resistivity obtained by a certain detection method. In this detection method, when a certain pressure is applied to a conductor, the resistance value R of the conductor detected by a multimeter is used to obtain the resistivity R A through conversion, that is, R A = R * A, where R A Is the resistivity, R is the measured resistance value, and A is the area of the measured conductor. Therefore, the unit of R A is ohm square centimeter. Of course, it is conceivable that it can also be ohm square meters. Because the resistance value of the material required for the electrophoresis process is generally below 10 6 ohms per square centimeter, it is obvious that the material disclosed in this patent does not meet the requirements, which is related to its application, because the material disclosed in patent number 200910175267.3 The purpose of conducting is to eliminate and reduce the static electricity generated by friction, not to apply to electrophoresis process. In addition, the material disclosed by patent number 200910175267.3 does not have the requirements of practical engineering applications, because in engineering practical applications, such as for bearings, the materials must have good mechanical properties, creep resistance, and lower The resistance value. Because it has good mechanical properties, it can be made into a thin film by turning.
发明内容Summary of the Invention
有鉴于此，本发明提供了一种具有很好的力学性能，抗蠕变性能，以及更低的电阻值的导电自润滑膜及其制备方法，以满足上述要求。In view of this, the present invention provides a conductive self-lubricating film with good mechanical properties, creep resistance, and lower resistance value, and a preparation method thereof to meet the above requirements.
一种轴承用导电自润滑膜，其使用于电泳工艺中，其特征在于：所述轴承用导电自润滑膜主要由氟聚合物、炭黑、碳纳米管，碳纤维，以及固体润滑剂组成，所述聚合物选自氟聚合物中的一种或几种且其重量比为70％～80％，炭黑的重量比为4％～5％，所述碳纳米管的重量比为1％～2％，所述碳纤维的重量比为15％～20％，所述固体润滑剂的重量比为0～9％，所述碳纳米管的长度为3μm～5μm。A conductive self-lubricating film for bearings, which is used in an electrophoresis process, is characterized in that the conductive self-lubricating film for bearings is mainly composed of fluoropolymer, carbon black, carbon nanotubes, carbon fibers, and solid lubricants. The polymer is selected from one or more of fluoropolymers, and its weight ratio is 70% to 80%, the weight ratio of carbon black is 4% to 5%, and the weight ratio of the carbon nanotubes is 1% to 2%, the weight ratio of the carbon fibers is 15% to 20%, the weight ratio of the solid lubricant is 0 to 9%, and the length of the carbon nanotubes is 3 μm to 5 μm.
进一步地，所述聚合物选自聚四氟乙烯、氟化的乙烯-丙烯、聚偏二氟乙烯、聚氯三氟乙烯、乙烯氯三氟乙烯、全氟烷氧基聚合物、以及它们的组合。Further, the polymer is selected from the group consisting of polytetrafluoroethylene, fluorinated ethylene-propylene, polyvinylidene fluoride, polychlorotrifluoroethylene, ethylenechlorotrifluoroethylene, perfluoroalkoxy polymers, and their combination.
进一步地，所述氟聚合物为全氟烷氧基乙烯，改性四氟乙烯-六氟丙烯，改性全氟烷氧基乙烯，乙烯-四氟乙烯，四氟乙烯-全氟，改性聚四氟乙烯，聚偏氟乙烯，乙烯-氯三氟乙烯。Further, the fluoropolymer is perfluoroalkoxyethylene, modified tetrafluoroethylene-hexafluoropropylene, modified perfluoroalkoxyethylene, ethylene-tetrafluoroethylene, tetrafluoroethylene-perfluoro, modified Teflon, polyvinylidene fluoride, ethylene-chlorotrifluoroethylene.
进一步地，所述轴承用导电自润滑膜的厚度为0.1mm～0.5mm。Further, the thickness of the conductive self-lubricating film for the bearing is 0.1 mm to 0.5 mm.
进一步地，所述固体润滑剂选自玻璃纤维、碳纤维、硅、石墨、聚醚醚酮、二硫化钼、芳香族聚酯、碳颗粒、青铜、氟聚合物、热塑性填充剂、矿物填充剂、以及它们的任何组合。Further, the solid lubricant is selected from glass fiber, carbon fiber, silicon, graphite, polyetheretherketone, molybdenum disulfide, aromatic polyester, carbon particles, bronze, fluoropolymer, thermoplastic filler, mineral filler, And any combination of them.
进一步地，所述氟聚合物至少占所述导电自润滑膜的重量的72％、78％、或80％。Further, the fluoropolymer accounts for at least 72%, 78%, or 80% of the weight of the conductive self-lubricating film.
一种轴承用导电自润滑膜的制备方法，其包括如下步骤：A method for preparing a conductive self-lubricating film for a bearing includes the following steps:
S1：提供炭黑与碳纳米管，该炭黑的重量比为4％～5％，碳纳米管的重量比为1％～2％，将该炭黑与该碳纳米管使用超声波分散法分散在液体介质中；S1: Provide carbon black and carbon nanotubes. The weight ratio of the carbon black is 4% to 5%, and the weight ratio of the carbon nanotubes is 1% to 2%. The carbon black and the carbon nanotubes are dispersed using an ultrasonic dispersion method. In liquid medium
S2：提供碳纤维、固体润滑剂、以及氟聚合物，该碳纤维的重量比15％～20％，所述固体润滑剂的重量比为0～9％，所述氟聚合物的重量比为70％～80％，并在低温条件下将所述碳纤维、固体润滑剂与所述氟聚合物均匀地混合在一起形成氟聚合物混合物；S2: Provide carbon fiber, solid lubricant, and fluoropolymer. The weight ratio of the carbon fiber is 15% to 20%. The weight ratio of the solid lubricant is 0 to 9%. The weight ratio of the fluoropolymer is 70%. ~ 80%, and the carbon fiber, the solid lubricant and the fluoropolymer are evenly mixed together at a low temperature to form a fluoropolymer mixture;
S3：将预分散好的炭黑与碳纳米管的溶液喷洒到该氟聚合物混合物上；S3: spraying a solution of the pre-dispersed carbon black and carbon nanotubes on the fluoropolymer mixture;
S4：将所述氟聚合物混合物在模具中进行高压制坯，并形成圆筒状坯料；S4: subjecting the fluoropolymer mixture to a high-pressure billet in a mold, and forming a cylindrical billet;
S5：将所述氟聚合物混合物的圆筒状坯料放烘箱中烧结48至144小时；S5: sintering the cylindrical billet of the fluoropolymer mixture in an oven for 48 to 144 hours;
S6：将冷却后的所述氟聚合物混合物的圆筒状坯料进行车削，即控制进刀量以获得所需厚度的导电自润滑膜。S6: Turning the cooled cylindrical blank of the fluoropolymer mixture, that is, controlling the feed amount to obtain a conductive self-lubricating film with a desired thickness.
进一步地，所液体介质为乙二醇溶液。Further, the liquid medium is a glycol solution.
进一步地，所述低温范围为低于19度。Further, the low temperature range is lower than 19 degrees.
进一步地，所述导电自润滑膜的厚度为0.1mm～0.5mm。Further, the thickness of the conductive self-lubricating film is 0.1 mm to 0.5 mm.
与现有技术相比，本发明所提供的导电自润滑膜使用炭黑与碳纳米管混合使用，降低了整体材料的成本，有利于推广使用，而该通过设定所述炭黑、碳纳米管、以及碳纤维的比例，微观上在该导电自润滑膜中形成了良好的导电网络，使得在宏观上该导电自润滑膜的电阻值小于103欧姆平方厘米，而且由于碳纤维的存在，使得该导电自润滑膜的具有良好的力学性能和抗蠕变性能，从而使得该导电自润滑材料适合车削以制备厚度符合要求的薄膜。Compared with the prior art, the conductive self-lubricating film provided by the present invention uses carbon black and carbon nanotubes in mixed use, which reduces the cost of the overall material and is conducive to popularization. By setting the carbon black and carbon nanometers, The ratio of the tube and the carbon fiber forms a good conductive network in the conductive self-lubricating film on a microscopic basis, so that the conductive self-lubricating film has a resistance value of less than 103 ohm square centimeters on the macro scale, and due to the presence of carbon fibers, the conductive The self-lubricating film has good mechanical properties and creep resistance, so that the conductive self-lubricating material is suitable for turning to prepare a film with a thickness that meets requirements.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明提供的轴承用导电自润滑膜的结构示意图。FIG. 1 is a schematic structural diagram of a conductive self-lubricating film for a bearing provided by the present invention.
图2为图1的导电自润滑膜的制备流程图。FIG. 2 is a flowchart of manufacturing the conductive self-lubricating film of FIG. 1.
具体实施方式detailed description
以下对本发明的具体实施例进行进一步详细说明。应当理解的是，此处对本发明实施例的说明并不用于限定本发明的保护范围。Hereinafter, specific embodiments of the present invention will be described in further detail. It should be understood that the description of the embodiments of the present invention is not intended to limit the protection scope of the present invention.
如图1所示，其为本发明提供的轴承用导电自润滑膜的结构示意图。所述轴承用导电自润滑膜主要由氟聚合物10、炭黑11、碳纳米管12，碳纤维13，以及固体润滑剂14组成。可以想到的是，根据实际的性能要求，所述轴承用导电自润滑膜还可以包括其他材料，如填料等。As shown in FIG. 1, it is a schematic structural diagram of a conductive self-lubricating film for bearings provided by the present invention. The conductive self-lubricating film for bearings is mainly composed of fluoropolymer 10, carbon black 11, carbon nanotubes 12, carbon fibers 13, and solid lubricant 14. It is conceivable that according to actual performance requirements, the conductive self-lubricating film for bearings may further include other materials, such as fillers and the like.
所述氟聚合物10为含氟的聚合物，其可以选自该含氟的聚合物中的一种或 几种。该含氟的聚合物可以为聚四氟乙烯(PTFE)、氟化的乙烯-丙烯(FEP)、聚偏二氟乙烯(PVDF)、聚氯三氟乙烯(PCTFE)、乙烯氯三氟乙烯(ECTFE)、全氟烷氧基聚合物(PFA)、或者它们的任何组合。所述含氟的聚合物还可以为全氟烷氧基乙烯，改性四氟乙烯-六氟丙烯，改性全氟烷氧基乙烯，乙烯-四氟乙烯，四氟乙烯-全氟，改性聚四氟乙烯，聚偏氟乙烯，乙烯-氯三氟乙烯中的一种或几种。在选用上述的材料的任意一种或几种的组合时，该氟聚合物10的重量比为70％～80％。优选地，所述氟聚合物10至少占所述轴承用导电自润滑膜的重量的72％、78％、或80％，且所述氟聚合物10为聚四氟乙烯(PTFE)。The fluoropolymer 10 is a fluorine-containing polymer, which may be selected from one or more kinds of the fluorine-containing polymer. The fluorine-containing polymer may be polytetrafluoroethylene (PTFE), fluorinated ethylene-propylene (FEP), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), ethylene chlorotrifluoroethylene ( ECTFE), perfluoroalkoxy polymers (PFA), or any combination thereof. The fluorine-containing polymer may also be perfluoroalkoxyethylene, modified tetrafluoroethylene-hexafluoropropylene, modified perfluoroalkoxyethylene, ethylene-tetrafluoroethylene, tetrafluoroethylene-perfluoro, modified One or more of polytetrafluoroethylene, polyvinylidene fluoride, and ethylene-chlorotrifluoroethylene. When any one or a combination of the foregoing materials is selected, the weight ratio of the fluoropolymer 10 is 70% to 80%. Preferably, the fluoropolymer 10 accounts for at least 72%, 78%, or 80% of the weight of the conductive self-lubricating film for bearings, and the fluoropolymer 10 is polytetrafluoroethylene (PTFE).
所述炭黑11为一般是指碳单质微粒，其在碳元素燃烧不充分，就会脱离分子，形成炭黑11。在炭黑11中，碳原子的排列方式类似于石墨，组成六角形平面，通常3～5个这样的层面组成一个微晶，由于炭黑11微晶的每个石墨层面中，碳原子的排列是有序的，而相邻层面间碳原子的排列又是无序的，所以又叫准石墨晶体。理论上认为，炭黑11填充量越大，处于分散状态的炭黑粒子或炭黑粒子集合体的密度也越大，粒子间的平均距离越小，相互接触的几率越高，炭黑粒子或炭黑粒子集合体形成的导电通路也越多。不同极性的高聚物与炭黑11组成共混体系的极性越大，炭黑11临界体积分数就越大，意味着体系的导电性下降，因为炭黑11表面含有很强的极性基团，基体极性大，作用增强，这时强度增加，却妨碍导电粒子自身的凝集，以致导电性差。但是在多组分基体树脂与炭黑11组成的共混体系中，由于不同基体的极性不同，填充炭黑11会产生偏析现象，这时导电性能取决于炭黑粒子在偏析相中的浓度和分布状态，还取决于偏析相高聚物所占比例。因此，一种混合物仅仅有炭黑11，其导电性也是很差的，即其电阻值会很高，难以达到电泳工艺的要求。因此，为了达到符合要求的导电性，炭黑11的重量比为4％～5％。优选地，所述炭黑11的含量为4.5wt％。The carbon black 11 generally refers to carbon simple particles, which will detach from molecules to form carbon black 11 when the carbon element is not sufficiently burned. In carbon black 11, the arrangement of carbon atoms is similar to graphite, forming a hexagonal plane. Usually 3 to 5 such layers form a microcrystal. Because of the arrangement of carbon atoms in each graphite layer of carbon black 11 microcrystals, It is ordered, and the arrangement of carbon atoms between adjacent layers is disordered, so it is also called quasi-graphite crystal. Theoretically, the greater the amount of carbon black 11 filled, the greater the density of the dispersed carbon black particles or carbon black particle aggregates, the smaller the average distance between particles, and the higher the probability of contact with each other, the carbon black particles or The more conductive paths formed by the carbon black particle assembly. The greater the polarity of the blend system composed of polymers of different polarities and carbon black 11, the greater the critical volume fraction of carbon black 11, which means that the conductivity of the system decreases, because the surface of carbon black 11 contains a strong polarity The group and the matrix have a large polarity and an enhanced effect. At this time, the strength increases, but it prevents the conductive particles from aggregating themselves, resulting in poor conductivity. However, in a blend system composed of a multi-component matrix resin and carbon black 11, due to the different polarities of the different matrixes, segregation occurs in the filled carbon black 11, and the conductivity depends on the concentration of carbon black particles in the segregated phase And the distribution state also depends on the proportion of segregated phase polymers. Therefore, a mixture containing only carbon black 11 has poor conductivity, that is, its resistance value will be very high, which is difficult to meet the requirements of the electrophoresis process. Therefore, in order to achieve the required conductivity, the weight ratio of carbon black 11 is 4% to 5%. Preferably, the content of the carbon black 11 is 4.5% by weight.
所述碳纳米管12可以看成是由单层或多层石墨片围绕中心轴按一定的螺旋角卷曲而成的无缝纳米级管，具有无缝中空的管状结构，其管体由六边形碳原子网格围成，两端则通常可视作两个半球形的大富勒烯分子。单壁碳纳米管的直径较细，一般为几纳米到十几个纳米。碳纳米管12具有良好的导电性能，由于碳纳米管12的结构与石墨的片层结构相同，所以具有很好的电学性能。理论预测其导电性能取决于其管径和管壁的螺旋角。当CNTs的管径大于6nm时，导 电性能下降；当管径小于6nm时，CNTs可以被看成具有良好导电性能的一维量子导线。为了达到符合要求的导电性，同时符合材料的力学性能与抗蠕变性能，所述碳纳米管12的重量比为1％～2％。优选地，所述碳纳米管12的含量为1.5wt％。所述碳纳米管12的长度应当为3μm～5μm，以提高其导电均匀性。因为碳纳米管12的长度可以达到厘米线，太长的话，在混合过程中会降低其分散的均匀性，从而会降低其导电的均匀性，进而会降低其在电泳工艺中的电泳效果，即电泳厚度不一的瑕疵。The carbon nanotubes 12 can be regarded as a seamless nano-scale tube made of a single or multi-layer graphite sheet rolled around a central axis at a certain spiral angle, and has a seamless hollow tubular structure. The tube body consists of six sides. Shaped carbon atoms are surrounded by a grid, and the two ends are usually regarded as two hemispherical large fullerene molecules. The diameter of single-walled carbon nanotubes is relatively thin, generally ranging from a few nanometers to a dozen nanometers. The carbon nanotubes 12 have good electrical conductivity. Since the structure of the carbon nanotubes 12 is the same as the sheet structure of graphite, they have good electrical properties. The theoretical prediction of its electrical conductivity depends on its pipe diameter and the helix angle of the pipe wall. When the diameter of CNTs is greater than 6nm, the conductivity is reduced; when the diameter of CNTs is less than 6nm, CNTs can be regarded as one-dimensional quantum wires with good conductivity. In order to achieve the required electrical conductivity and the mechanical properties and creep resistance of the material, the weight ratio of the carbon nanotubes 12 is 1% to 2%. Preferably, the content of the carbon nanotubes 12 is 1.5% by weight. The length of the carbon nanotubes 12 should be 3 μm to 5 μm to improve the conductivity uniformity. Because the length of the carbon nanotubes 12 can reach the centimeter line, if it is too long, the uniformity of dispersion during the mixing process will be reduced, which will reduce the uniformity of its electrical conductivity, and further reduce its electrophoretic effect in the electrophoresis process, that Defects of varying thickness.
所述碳纤维13为是一种含碳量在95％以上的高强度、高模量纤维的新型纤维材料。它是由片状石墨微晶等有机纤维沿纤维轴向方向堆砌而成，经碳化及石墨化处理而得到的微晶石墨材料。碳纤维13“外柔内刚”，质量比金属铝轻，但强度却高于钢铁，并且具有耐腐蚀、高模量的特性。碳纤维13还有很多的性能，如密度低、比性能高，无蠕变，非氧化环境下耐超高温，耐疲劳性好，比热及导电性介于非金属和金属之间，热膨胀系数小且具有各向异性，耐腐蚀性好，X射线透过性好。良好的导电导热性能、电磁屏蔽性好。为了使该轴承用导电自润滑膜具有良好的导电性能，同时具有符合材料的力学性能与抗蠕变性能，所述碳纤维13的重量比为15％～20％。优选地，所述碳纤维13的含量为18wt％。The carbon fiber 13 is a new fiber material with high strength and high modulus fiber with a carbon content of 95% or more. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystals along the axial direction of the fiber and subjecting them to carbonization and graphitization. Carbon fiber 13 is "flexible outside and rigid inside". It is lighter than metal aluminum, but its strength is higher than steel, and it has the characteristics of corrosion resistance and high modulus. Carbon fiber 13 also has many properties, such as low density, high specific performance, no creep, resistance to ultra-high temperature in non-oxidizing environment, good fatigue resistance, specific heat and electrical conductivity between non-metal and metal, and low thermal expansion coefficient It also has anisotropy, good corrosion resistance, and good X-ray transmission. Good electrical and thermal conductivity, good electromagnetic shielding. In order to make the conductive self-lubricating film for the bearing have good electrical conductivity and meet the mechanical properties and creep resistance of the material, the weight ratio of the carbon fiber 13 is 15% to 20%. Preferably, the content of the carbon fiber 13 is 18% by weight.
所述固体润滑剂14选自玻璃纤维、硅、石墨、聚醚醚酮、二硫化钼、芳香族聚酯、碳颗粒、青铜、热塑性填充剂、矿物填充剂、以及它们的任何组合。所述固体润滑剂的作用在于减小摩擦，在本实施例中，所述固体润滑剂14为二硫化钼，其重量比为0～9％。The solid lubricant 14 is selected from glass fibers, silicon, graphite, polyetheretherketone, molybdenum disulfide, aromatic polyesters, carbon particles, bronze, thermoplastic fillers, mineral fillers, and any combination thereof. The role of the solid lubricant is to reduce friction. In this embodiment, the solid lubricant 14 is molybdenum disulfide, and its weight ratio is 0-9%.
图2为所述轴承用导电自润滑膜的制备方法的流程图。所述轴承用导电自润滑膜的制备方法包括如下步骤：FIG. 2 is a flowchart of a method for preparing the conductive self-lubricating film for a bearing. The method for preparing the conductive self-lubricating film for a bearing includes the following steps:
S1：提供炭黑11与碳纳米管12，该炭黑11的重量比为4％～5％，碳纳米管12的重量比为1％～2％，将该炭黑11与该碳纳米管12使用超声波分散法分散在液体介质中；S1: Provide carbon black 11 and carbon nanotubes 12, the weight ratio of the carbon black 11 is 4% to 5%, the weight ratio of the carbon nanotubes 12 is 1% to 2%, and the carbon black 11 and the carbon nanotubes are provided. 12Using ultrasonic dispersion method to disperse in liquid medium;
S2：提供碳纤维13、固体润滑剂、以及氟聚合物10，该碳纤维13的重量比15％～20％，所述固体润滑剂的重量比为0～9％，所述氟聚合物10的重量比为70％～80％，并在低温条件下将所述碳纤维13、固体润滑剂与所述氟聚合物10均匀地混合在一起形成氟聚合物混合物；S2: Provide a carbon fiber 13, a solid lubricant, and a fluoropolymer 10. The weight ratio of the carbon fiber 13 is 15% to 20%. The weight ratio of the solid lubricant is 0 to 9%. The weight of the fluoropolymer 10 The ratio is 70% to 80%, and the carbon fiber 13, the solid lubricant and the fluoropolymer 10 are uniformly mixed together at a low temperature to form a fluoropolymer mixture;
S3：将预分散好的炭黑11与碳纳米管12的溶液喷洒到该氟聚合物混合物 上；S3: spraying a solution of the pre-dispersed carbon black 11 and carbon nanotubes 12 onto the fluoropolymer mixture;
S4：将所述氟聚合物混合物在模具中进行高压制坯，并形成圆筒状坯料；S4: subjecting the fluoropolymer mixture to a high-pressure billet in a mold, and forming a cylindrical billet;
S5：将所述氟聚合物混合物的圆筒状坯料放烘箱中烧结若干小时；S5: sintering the cylindrical billet of the fluoropolymer mixture in an oven for several hours;
S6：将冷却后的所述氟聚合物混合物的圆筒状坯料进行车削，即控制进刀量以获得所需厚度的导电自润滑膜。S6: Turning the cooled cylindrical blank of the fluoropolymer mixture, that is, controlling the feed amount to obtain a conductive self-lubricating film with a desired thickness.
在步骤S1中，所述液体介质可以为含有乙二醇的溶液，在本实施例中为比例为所述乙二醇所占的比例为15％-25％wt。In step S1, the liquid medium may be a solution containing ethylene glycol, and in this embodiment, the ratio is 15% -25% wt.
在步骤S2中，所述温度应当控制在19℃以下，优选是10℃。In step S2, the temperature should be controlled below 19 ° C, preferably 10 ° C.
在步骤S3中，在喷洒所述炭黑11与碳纳米管12的溶液时，还应当搅拌所述氟聚合物混合物，以使该坯料混合均匀。In step S3, when the solution of the carbon black 11 and the carbon nanotubes 12 is sprayed, the fluoropolymer mixture should also be stirred to make the billet uniformly mixed.
在步骤S6中，通过车削，可以制造出厚度为0.1mm～0.5mm的轴承用导电自润滑膜。在本实施例中，所述轴承用导电用自润滑膜的厚度为0.2mm。In step S6, a conductive self-lubricating film for bearings having a thickness of 0.1 mm to 0.5 mm can be manufactured by turning. In this embodiment, the thickness of the conductive self-lubricating film for the bearing is 0.2 mm.
与现有技术相比，本发明所提供的导电自润滑膜使用炭黑与碳纳米管混合使用，降低了整体材料的成本，有利于推广使用，而该通过设定所述炭黑、碳纳米管、以及碳纤维的比例，微观上在该导电自润滑膜中形成了良好的导电网络，使得在宏观上该导电自润滑膜的电阻值小于10 3欧姆平方厘米，而且由于碳纤维的存在，使得该导电自润滑膜的具有良好的力学性能和抗蠕变性能，从而使得该导电自润滑材料适合车削以制备厚度符合要求的薄膜。 Compared with the prior art, the conductive self-lubricating film provided by the present invention uses carbon black and carbon nanotubes in mixed use, which reduces the cost of the overall material and is conducive to promotion and use. The ratio of the tube and the carbon fiber forms a good conductive network in the conductive self-lubricating film on a microscopic level, so that the conductive self-lubricating film has a resistance value of less than 103 ohm square centimeters on the macro level. The conductive self-lubricating film has good mechanical properties and creep resistance, so that the conductive self-lubricating material is suitable for turning to prepare a film with a thickness that meets requirements.
以上仅为本发明的较佳实施例，并不用于局限本发明的保护范围，任何在本发明精神内的修改、等同替换或改进等，都涵盖在本发明的权利要求范围内。The above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement or improvement within the spirit of the present invention is covered by the scope of the claims of the present invention.

Claims (10)

  1. 一种轴承用导电自润滑膜，其使用于电泳工艺中，其特征在于：所述轴承用导电自润滑膜主要由氟聚合物、炭黑、碳纳米管，碳纤维，以及固体润滑剂组成，所述聚合物选自氟聚合物中的一种或几种且其重量比为70％～80％，炭黑的重量比为4％～5％，所述碳纳米管的重量比为1％～2％，所述碳纤维的重量比为15％～20％，所述固体润滑剂的重量比为0～9％，所述碳纳米管的长度为3μm～5μm。A conductive self-lubricating film for bearings, which is used in an electrophoresis process, is characterized in that the conductive self-lubricating film for bearings is mainly composed of fluoropolymer, carbon black, carbon nanotubes, carbon fibers, and solid lubricants. The polymer is selected from one or more of fluoropolymers, and its weight ratio is 70% to 80%, the weight ratio of carbon black is 4% to 5%, and the weight ratio of the carbon nanotubes is 1% to 2%, the weight ratio of the carbon fibers is 15% to 20%, the weight ratio of the solid lubricant is 0 to 9%, and the length of the carbon nanotubes is 3 μm to 5 μm.
  2. 如权利要求1所述的轴承用导电自润滑膜，其特征在于：所述聚合物选自聚四氟乙烯、氟化的乙烯-丙烯、聚偏二氟乙烯、聚氯三氟乙烯、乙烯氯三氟乙烯、全氟烷氧基聚合物、以及它们的组合。The conductive self-lubricating film for a bearing according to claim 1, wherein the polymer is selected from the group consisting of polytetrafluoroethylene, fluorinated ethylene-propylene, polyvinylidene fluoride, polyvinyl chloride trifluoroethylene, and vinyl chloride Trifluoroethylene, perfluoroalkoxy polymers, and combinations thereof.
  3. 如权利要求2所述的轴承用导电自润滑膜，其特征在于：所述氟聚合物为全氟烷氧基乙烯，改性四氟乙烯-六氟丙烯，改性全氟烷氧基乙烯，乙烯-四氟乙烯，四氟乙烯-全氟，改性聚四氟乙烯，聚偏氟乙烯，乙烯-氯三氟乙烯。The conductive self-lubricating film for a bearing according to claim 2, wherein the fluoropolymer is perfluoroalkoxyethylene, modified tetrafluoroethylene-hexafluoropropylene, modified perfluoroalkoxyethylene, Ethylene-tetrafluoroethylene, tetrafluoroethylene-perfluoro, modified polytetrafluoroethylene, polyvinylidene fluoride, ethylene-chlorotrifluoroethylene.
  4. 如权利要求1所述的轴承用导电自润滑膜，其特征在于：所述轴承用导电自润滑膜的厚度为0.1mm～0.5mm。The conductive self-lubricating film for a bearing according to claim 1, wherein the conductive self-lubricating film for a bearing has a thickness of 0.1 mm to 0.5 mm.
  5. 如权利要求1所述的轴承用导电自润滑膜，其特征在于：所述固体润滑剂选自玻璃纤维、碳纤维、硅、石墨、聚醚醚酮、二硫化钼、芳香族聚酯、碳颗粒、青铜、氟聚合物、热塑性填充剂、矿物填充剂、以及它们的任何组合。The conductive self-lubricating film for bearings according to claim 1, wherein the solid lubricant is selected from the group consisting of glass fiber, carbon fiber, silicon, graphite, polyetheretherketone, molybdenum disulfide, aromatic polyester, and carbon particles. , Bronze, fluoropolymer, thermoplastic fillers, mineral fillers, and any combination thereof.
  6. 如权利要求1所述的轴承用导电自润滑膜，其特征在于：所述氟聚合物至少占所述导电自润滑膜的重量的72％、78％、或80％。The conductive self-lubricating film for a bearing according to claim 1, wherein the fluoropolymer accounts for at least 72%, 78%, or 80% of the weight of the conductive self-lubricating film.
  7. 一种轴承用导电自润滑膜的制备方法，其包括如下步骤：A method for preparing a conductive self-lubricating film for a bearing includes the following steps:
    S1：提供炭黑与碳纳米管，该炭黑的重量比为4％～5％，碳纳米管的重量比为1％～2％，将该炭黑与该碳纳米管使用超声波分散法分散在液体介质中；S1: Provide carbon black and carbon nanotubes. The weight ratio of the carbon black is 4% to 5%, and the weight ratio of the carbon nanotubes is 1% to 2%. The carbon black and the carbon nanotubes are dispersed using an ultrasonic dispersion method. In liquid medium
    S2：提供碳纤维、固体润滑剂、以及氟聚合物，该碳纤维的重量比15％～20％，所述固体润滑剂的重量比为0～9％，所述氟聚合物的重量比为70％～80％，并在低温条件下将所述碳纤维、固体润滑剂与所述氟聚合物均匀地混合在一起形成氟聚合物混合物；S2: Provide carbon fiber, solid lubricant, and fluoropolymer. The weight ratio of the carbon fiber is 15% to 20%. The weight ratio of the solid lubricant is 0 to 9%. The weight ratio of the fluoropolymer is 70%. ~ 80%, and the carbon fiber, the solid lubricant and the fluoropolymer are evenly mixed together at a low temperature to form a fluoropolymer mixture;
    S3：将预分散好的炭黑与碳纳米管的溶液喷洒到该氟聚合物混合物上；S3: spraying a solution of the pre-dispersed carbon black and carbon nanotubes on the fluoropolymer mixture;
    S4：将所述氟聚合物混合物在模具中进行高压制坯，并形成圆筒状坯料；S4: subjecting the fluoropolymer mixture to a high-pressure billet in a mold, and forming a cylindrical billet;
    S5：将所述氟聚合物混合物的圆筒状坯料放烘箱中烧结48至144小时；S5: sintering the cylindrical billet of the fluoropolymer mixture in an oven for 48 to 144 hours;
    S6：将冷却后的所述氟聚合物混合物的圆筒状坯料进行车削，即控制进刀量以获得所需厚度的导电自润滑膜。S6: Turning the cooled cylindrical blank of the fluoropolymer mixture, that is, controlling the feed amount to obtain a conductive self-lubricating film with a desired thickness.
  8. 如权利要求1所述的轴承用导电自润滑膜的制备方法，其特征在于：所液体介质为乙二醇溶液。The method for preparing a conductive self-lubricating film for a bearing according to claim 1, wherein the liquid medium is a glycol solution.
  9. 如权利要求1所述的轴承用导电自润滑膜的制备方法，其特征在于：所述低温范围为低于19度。The method for preparing a conductive self-lubricating film for a bearing according to claim 1, wherein the low temperature range is lower than 19 degrees.
  10. 如权利要求1所述的轴承用导电自润滑膜的制备方法，其特征在于：所述导电自润滑膜的厚度为0.1mm～0.5mm。The method for preparing a conductive self-lubricating film for a bearing according to claim 1, wherein the thickness of the conductive self-lubricating film is 0.1 mm to 0.5 mm.
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CN208914713U (en) * 2018-08-22 2019-05-31 浙江长盛滑动轴承股份有限公司 A kind of conductive self-lubricating composite plate of bearing

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