CN113897024A - Wear-resistant polyether-ether-ketone material for protecting easily worn units and application thereof - Google Patents
Wear-resistant polyether-ether-ketone material for protecting easily worn units and application thereof Download PDFInfo
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- CN113897024A CN113897024A CN202111273825.7A CN202111273825A CN113897024A CN 113897024 A CN113897024 A CN 113897024A CN 202111273825 A CN202111273825 A CN 202111273825A CN 113897024 A CN113897024 A CN 113897024A
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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
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/16—Condensation polymers of aldehydes or ketones with phenols only of ketones with phenols
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
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Abstract
The invention relates to a wear-resistant polyether-ether-ketone material for protecting an easily worn unit and application thereof, wherein the wear-resistant polyether-ether-ketone material comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber. The wear-resistant polyether-ether-ketone material provided by the invention has low dynamic friction coefficient and excellent wear resistance, is not easily worn by a glass fiber reinforced material and is not easily worn on a 6061 aluminum alloy seat, and has excellent mechanical properties; the polyether-ether-ketone material is prepared into the short spacer bush, and the short spacer bush is arranged between the plastic spacer bush prepared from the glass fiber reinforced material and the easily-worn 6061 aluminum alloy seat, so that the abrasion loss of the 6061 aluminum alloy seat can be reduced, the plastic spacer bush prepared from the glass fiber reinforced material can be applied to the rocker arm shaft, and the aim of reducing the weight of a vehicle is fulfilled.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a wear-resistant polyether-ether-ketone material for protecting an easily worn unit and application thereof.
Background
Lightweight is one of the subjects of the development of the automotive industry. The automotive industry is striving to replace unrecoverable thermoset plastics and metal parts near engines such as fuel systems, exhaust systems, cooling systems, etc. with polymeric materials to meet the demand for weight reduction.
The commercial vehicle diesel engine air intake and exhaust integrated rocker arm shaft is sleeved with a spacer sleeve, the spacer sleeve and the rocker arm seat form a rotating friction pair, and the functions of positioning the air intake and exhaust rocker arms and preventing axial movement are achieved. The traditional engine rocker shaft spacer bush is made of steel with larger weight, so that the light-weight development of the engine is restricted.
For the purpose of light weight, chinese patent application CN110700913A replaces the steel spacer of the engine rocker shaft with a plastic spacer, and discloses that the raw material of the spacer can be replaced by PA4T, PA9T, PA10T, PPS, PEEK, PI, LCP, and PSU. The price of polyether ether ketone (PEEK) in the thermoplastic materials is high, so that the cost of the spacer sleeve is increased; the nylon thermoplastic materials PA4T, PA9T and PA10T have the advantages of low price, light weight and good rigidity, and become the preferred materials of the plastic spacer. However, rocker arm seats are often subject to severe wear when ground against plastic spacers made of nylon-based thermoplastic materials.
Disclosure of Invention
In order to solve the problem that the rocker arm seat and a plastic spacer sleeve made of nylon thermoplastic materials are seriously abraded during opposite grinding, the invention utilizes polyether-ether-ketone materials to prepare the short spacer sleeve, and the short spacer sleeve is arranged between a 6061 aluminum alloy seat which is easy to abrade and the plastic spacer sleeve made of glass fiber reinforced materials, so that the abrasion loss of the 6061 aluminum alloy seat can be reduced.
The conventional polyether-ether-ketone material does not meet the scene of opposite grinding of a 6061 aluminum alloy seat and a glass fiber reinforced material, the invention develops the polyether-ether-ketone material with low dynamic friction coefficient and excellent wear resistance, the aim of not wearing the 6061 aluminum alloy seat while being not easily worn by the glass fiber reinforced material is fulfilled, and the material has excellent mechanical properties.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the invention provides a wear-resistant polyetheretherketone material for protecting an easily worn unit, comprising the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
Based on the technical scheme, the wear-resistant polyether-ether-ketone material provided by the invention has low dynamic friction coefficient and excellent wear resistance, is not easily worn by a glass fiber reinforced nylon material and does not easily wear a 6061 aluminum alloy seat, and has excellent mechanical properties.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily worn unit, the easily worn unit is preferably made of 6061 aluminum alloy.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily worn unit, which is provided by the invention, the wear-resistant polyether-ether-ketone material preferably comprises the following components: 55 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily worn unit, which is provided by the invention, the preferable technical scheme of the invention is that the average particle size of the crystalline flake graphite is 10-200 mu m, and the specific surface area is more than 1m2(ii)/g; the average grain diameter of the polytetrafluoroethylene is 1-20 mu m, and the specific surface area is more than 2m2(ii)/g; the average fiber diameter of the carbon fiber is 2-20 μm; the above-mentionedThe length-diameter ratio of the carbon fiber is 150-1500.
In a second aspect, the present invention provides a method for preparing a wear part for protecting a wearable element, comprising the steps of:
providing the wear-resistant polyether-ether-ketone material for protecting the units easy to wear;
premixing dried polyether-ether-ketone, polytetrafluoroethylene and crystalline flake graphite, and adding the premixed material into a double-screw extruder through a main feeding port;
adding carbon fibers into a double-screw extruder through a side feeding port;
performing melt extrusion and granulation at the temperature of 320-370 ℃ by a double-screw extruder to obtain wear-resistant polyether-ether-ketone master batches;
and (3) dehumidifying and drying the wear-resistant polyether-ether-ketone master batch, and performing injection molding at the temperature of 320-370 ℃ to obtain the wear-resistant part for protecting the units easy to wear.
Based on the technical scheme, the wear-resistant part is prepared from the wear-resistant polyether-ether-ketone material, is arranged between the glass fiber reinforced nylon material element and the 6061 aluminum alloy element, is not easily worn by the glass fiber reinforced nylon material element and the 6061 aluminum alloy element, and has a protection effect on the 6061 aluminum alloy element.
In a third aspect, the invention provides a short spacer bush of an engine rocker shaft, which is used for being arranged between the end surface of a long spacer bush and a 6061 aluminum alloy seat; the long spacer bush is made of glass fiber reinforced nylon material; the engine rocker shaft short spacer bush comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
Based on the technical scheme, the short spacer bush made of the polyether-ether-ketone material is arranged between the 6061 aluminum alloy seat which is easy to wear and the plastic spacer bush made of the glass fiber reinforced material, so that the wear loss of the 6061 aluminum alloy seat can be reduced, the plastic spacer bush made of the glass fiber reinforced nylon material can be applied to the rocker arm shaft, and the aim of reducing the weight of a vehicle is fulfilled.
On the basis of the short spacer bush of the engine rocker shaft provided by the invention, as the optimization of the technical scheme of the invention, the end surface of the long spacer bush is C-shaped; the end face of the short spacer bush is annular.
On the basis of the short spacer bush of the engine rocker shaft provided by the invention, as a preferable technical scheme of the invention, the long spacer bush is made of 50% glass fiber reinforced PA6T material.
In a fourth aspect, the present invention provides a limiting member assembly for a rocker shaft of an engine, comprising in sequence: the aluminum alloy seat 6061 comprises an aluminum alloy seat, an annular short spacer bush and a C-shaped long spacer bush, wherein the long spacer bush is made of glass fiber reinforced nylon material; the short spacer bush comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
On the basis of the limit piece combination of the engine rocker shaft, the long spacer bush is preferably made of 50% glass fiber reinforced PA6T material.
In a fifth aspect, the present invention provides an engine rocker arm shaft, including the above engine rocker arm shaft limiting member combination.
The invention has the following advantages and beneficial effects:
according to the invention, 3 wear-resisting agents are adopted to modify the polyether-ether-ketone material, and the crystalline flake graphite can provide a good lubricating effect at the initial stage of grinding, so that the friction coefficient and the wear are reduced; polytetrafluoroethylene can continue to reduce the coefficient of friction and wear during the middle of the counter-grinding. Meanwhile, the 2 soft materials can well protect materials which are opposite to the wear-resistant polyether-ether-ketone materials. The carbon fiber can improve the strength and the surface hardness of the wear-resistant polyether-ether-ketone material and obviously reduce the self abrasion of the material. The dynamic friction coefficient of the wear-resistant polyether-ether-ketone material is less than 0.4 and the abrasion is less than 80 multiplied by 10 through preferably combining 3 wear-resistant agents-6mg/Nm。
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 illustrates an engine rocker shaft retainer assembly provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention relates to a spacer bush of an engine rocker shaft of an automobile, which is required to have the performances of light weight, high strength, wear resistance, high temperature resistance and the like. Polyether ether ketone (PEEK) is a wholly aromatic semi-crystalline thermoplastic material, and has the characteristics of high temperature resistance, self lubrication, easiness in processing, high mechanical strength and the like because a macromolecular chain of the PEEK contains a rigid benzene ring, a flexible ether bond and carbonyl groups for improving intermolecular action and has a regular structure. PEEK has good chemical resistance, flame retardancy, peel resistance, hydrolysis resistance, fatigue resistance, insulation, stability, high temperature resistance, and also has good wear resistance.
In order to reduce the cost of raw materials, the engine rocker shaft spacer bush is made of glass fiber reinforced nylon material; the glass fiber reinforced nylon material seriously abrades the 6061 aluminum alloy seat, therefore, the invention provides a limit part combination of an engine rocker arm shaft, which sequentially comprises: 6061 aluminum alloy seat, annular short spacer bush, C type long spacer bush adopt annular short spacer bush to protect 6061 aluminum alloy seat.
Experiments prove that the annular short spacer sleeve prepared from the domestic conventional polyether-ether-ketone material modified by systems such as glass fiber, aramid fiber or nano inorganic matters can abrade the 6061 aluminum alloy seat at high temperature, or abrade the glass fiber reinforced nylon open spacer sleeve, or is seriously abraded by the spacer sleeve, so that the requirements are not met. For example, the polyether-ether-ketone material reinforced by inorganic nano-filler, which is nano-kaolin (known as some inorganic oxides), is made into an annular short spacer bush, and is sleeved on an engine rocker shaft together with a C-type long spacer bush and a rocker arm which are made of glass fiber reinforced nylon material, wherein the rocker arm, the C-type spacer bush, the annular short spacer bush and a 6061 aluminum alloy seat are sequentially sleeved, then lateral force is applied in the axial direction for compression, and different mounting and fixing modes are adopted, so that a dynamic friction and wear test can be completed in a free motion state or between any two pairs of friction pairs. The method comprises the steps of simulating a dynamic friction wear test of a friction pair matched with an engine under high-speed operation of the engine at the high temperature of 130 ℃, oil dripping lubrication and 200N lateral force of an annular short spacer prepared from an inorganic nano filler reinforced polyether-ether-ketone material, and then measuring the axial maximum wear depth value of a C-type long spacer, an annular short spacer and a 6061 aluminum alloy seat, wherein the wear of the 6061 aluminum alloy seat is not more than 0.02mm, the wear of the C-type long spacer and the annular short spacer is not more than 0.05mm within a short period of 20 hours, and the smaller the wear value is, the better the wear value is. The results show that the short annular spacer is worn too severely by the 6061 aluminum alloy seat when the short annular spacer is worn by itself, or the short annular spacer is not worn by itself when the long C-shaped spacer is not worn.
The invention improves the wear-resistant polyether-ether-ketone material of the short spacer bush of the rocker shaft of the engine, does not adopt inorganic filler, but adopts crystalline flake graphite and carbon fiber as filler, and the improved wear-resistant polyether-ether-ketone material comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber. The improved wear-resistant polyether-ether-ketone material has low dynamic friction coefficient and excellent wear resistance, is not easily worn by a glass fiber reinforced material and does not easily wear a 6061 aluminum alloy seat, and has excellent mechanical property and high temperature resistance.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
The present invention will be specifically described below with reference to examples, but the scope of the present invention is not limited thereto.
In a first aspect, the invention provides a wear-resistant polyetheretherketone material for protecting an easily worn unit, comprising the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
Based on the technical scheme, the polyether-ether-ketone material provided by the invention has low dynamic friction coefficient and excellent wear resistance, is not easily worn by a glass fiber reinforced material, is not easily worn by a 6061 aluminum alloy seat, and has excellent mechanical properties.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily worn unit, the easily worn unit is preferably made of 6061 aluminum alloy.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily worn unit, which is provided by the invention, the wear-resistant polyether-ether-ketone material preferably comprises the following components: 55 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
On the basis of the wear-resistant polyether-ether-ketone material for protecting the easily worn units, the technical scheme of the invention is preferable that the crystalline flake graphite is hexagonal natural obvious crystalline graphite, has a lamellar structure, has an average particle size of 10-200 mu m and a specific surface area of more than 1m2/g。
The average grain diameter of the PTFE is 1-20 mu m, and the specific surface area is more than 2m2/g。
The carbon fiber is of a micron-sized fiber character structure and is a fiber with a circular cross section; the average fiber diameter of the carbon fiber is 2-20 μm, preferably 4-15 μm; the average fiber length of the carbon fiber is 2-7 mm; the length-diameter ratio of the carbon fiber is 150-1500. The carbon fibers may be carbonaceous non-graphitizing, lightly graphitizing, highly graphitizing. The carbon fiber may be anisotropic pitch-based carbon fiber, PAN-based carbon fiber, isotropic pitch-based carbon fiber, and is preferably isotropic pitch-based carbon fiber.
In a second aspect, the present invention provides a method for preparing a wear part for protecting a wearable element, comprising the steps of:
the wear-resistant polyether-ether-ketone material for protecting the easily worn unit is provided,
premixing dried PEEK, PTFE and graphite, and adding the premixed material into a main feeding port of a double-screw extruder;
adding carbon fibers into a double-screw extruder through a side feeding machine;
melting, extruding and granulating by a double-screw extruder at the set temperature of 320-370 ℃ to obtain wear-resistant polyether-ether-ketone master batches;
and (3) dehumidifying and drying the wear-resistant polyether-ether-ketone master batch, and performing injection molding at the temperature of 320-370 ℃.
The preparation method comprises the following steps:
premixing the dried PEEK, PTFE and graphite by using a high-speed stirrer, accurately metering, adding into a main feeding port of a double-screw extruder, adding carbon fibers into the double-screw extruder through a side feeding machine, and performing melt extrusion and granulation through the double-screw extruder at the set temperature of 320-370 ℃ to obtain the wear-resistant PEEK composition; the obtained granular PEEK composition is dehumidified and dried at the temperature of 120-160 ℃ for 4h, and the temperature of a barrel of an injection molding machine is set at the temperature of 320-370 ℃ to complete injection molding.
Based on the technical scheme, the polyether-ether-ketone material is prepared into the wear-resistant part arranged between the glass fiber reinforced material and the 6061 aluminum alloy.
In a third aspect, the invention provides an engine rocker shaft spacer bush, which comprises a long spacer bush and a short spacer bush, wherein the short spacer bush is used for being arranged between the end surface of the long spacer bush and an aluminum alloy base; the long spacer bush is made of glass fiber reinforced nylon material; the short spacer bush comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
Based on the technical scheme, the short spacer bush made of the polyether-ether-ketone material is arranged between the 6061 aluminum alloy seat which is easy to wear and the plastic spacer bush made of the glass fiber reinforced material, so that the wear loss of the 6061 aluminum alloy seat can be reduced, the plastic spacer bush can be applied to the rocker arm shaft, and the aim of lightening the vehicle is fulfilled.
On the basis of the engine rocker shaft spacer bush provided by the invention, as the optimization of the technical scheme of the invention, the end surface of the long spacer bush is C-shaped; the end face of the short spacer bush is annular.
On the basis of the engine rocker shaft spacer bush provided by the invention, as a preferable technical scheme of the invention, the long spacer bush is made of 50% glass fiber reinforced PA6T material.
In a fourth aspect, the present invention provides a limiting member assembly for a rocker shaft of an engine, comprising in sequence: the aluminum alloy seat 6061 comprises an aluminum alloy seat, an annular short spacer bush and a C-shaped long spacer bush, wherein the long spacer bush is made of glass fiber reinforced nylon material; the short spacer bush comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
On the basis of the limit piece combination of the engine rocker shaft, the long spacer bush is preferably made of 50% glass fiber reinforced PA6T material.
In a fifth aspect, the present invention provides an engine rocker arm shaft, including the above engine rocker arm shaft limiting member combination.
The specific embodiments provided by the invention are as follows:
the types, brands and sources of the raw materials of the components in the examples and the comparative examples of the invention are shown in Table 1:
TABLE 1
Example 1
The wear-resistant polyether-ether-ketone material for protecting an easily worn unit provided by the embodiment comprises the following components in parts by weight: 85 parts of polyether-ether-ketone resin; 5 parts of flake graphite; 5 parts of polytetrafluoroethylene; 5 parts of carbon fiber.
The preparation method of the wear-resistant part for protecting the unit easy to wear provided by the embodiment comprises the following steps:
premixing 85 parts of PEEK, 5 parts of PTFE and 5 parts of crystalline flake graphite which are dried by using a high-speed stirrer, accurately metering, adding the obtained mixture into a main feeding port of a double-screw extruder, adding 5 parts of carbon fiber into the double-screw extruder through a side feeding machine, and performing melt extrusion and granulation through the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant PEEK master batches; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batches at 140 ℃ for 4h, and setting the barrel temperature of an injection molding machine at 360 ℃ to complete injection molding to obtain the short spacer bush of the engine rocker shaft.
Example 2
The wear-resistant polyether-ether-ketone material for protecting an easily worn unit provided by the embodiment comprises the following components in parts by weight: 70 parts of polyether-ether-ketone resin; 10 parts of flake graphite; 10 parts of polytetrafluoroethylene; 10 parts of carbon fiber.
The preparation method of the wear-resistant part for protecting the unit easy to wear provided by the embodiment comprises the following steps:
premixing 70 parts of PEEK, 10 parts of PTFE and 10 parts of crystalline flake graphite which are dried by using a high-speed stirrer, accurately metering, adding the obtained mixture into a main feeding port of a double-screw extruder, adding 10 parts of carbon fiber into the double-screw extruder through a side feeding machine, and performing melt extrusion and granulation through the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant PEEK master batches; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batches at 140 ℃ for 4h, and setting the barrel temperature of an injection molding machine at 360 ℃ to complete injection molding to obtain the short spacer bush of the engine rocker shaft.
Example 3
The wear-resistant polyether-ether-ketone material for protecting an easily worn unit provided by the embodiment comprises the following components in parts by weight: 55 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
The preparation method of the wear-resistant part for protecting the unit easy to wear provided by the embodiment comprises the following steps:
premixing 55 parts of PEEK, 15 parts of PTFE and 15 parts of crystalline flake graphite which are dried by using a high-speed stirrer, accurately metering, adding the obtained mixture into a main feeding port of a double-screw extruder, adding 15 parts of carbon fiber into the double-screw extruder through a side feeding machine, and performing melt extrusion and granulation through the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant PEEK master batches; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batches at 140 ℃ for 4h, and setting the barrel temperature of an injection molding machine at 360 ℃ to complete injection molding to obtain the short spacer bush of the engine rocker shaft.
Comparative example 1
The wear-resistant polyether-ether-ketone material for protecting the easily worn unit comprises the following components in parts by weight: 90 parts of polyether-ether-ketone resin; 30 parts of flake graphite.
The preparation method of the wear-resistant part for protecting the easily worn unit, provided by the comparative example, comprises the following steps:
premixing 90 parts of dried PEEK and 30 parts of crystalline flake graphite by using a high-speed mixer, accurately metering, adding into a main feeding port of a double-screw extruder, and performing melt extrusion and granulation by the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batches; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batches at 140 ℃ for 4h, and setting the barrel temperature of an injection molding machine at 360 ℃ to complete injection molding to obtain the short spacer bush of the engine rocker shaft.
Comparative example 2
The wear-resistant polyether-ether-ketone material for protecting the easily worn unit comprises the following components in parts by weight: 90 parts of polyether-ether-ketone resin; and 30 parts of PTFE.
The preparation method of the wear-resistant part for protecting the easily worn unit, provided by the comparative example, comprises the following steps:
premixing 90 parts of dried PEEK and 30 parts of PTFE by using a high-speed mixer, accurately metering, adding into a main feeding port of a double-screw extruder, and performing melt extrusion and granulation by the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant PEEK master batches; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batches at 140 ℃ for 4h, and setting the barrel temperature of an injection molding machine at 360 ℃ to complete injection molding to obtain the short spacer bush of the engine rocker shaft.
Comparative example 3
The wear-resistant polyether-ether-ketone material for protecting the easily worn unit comprises the following components in parts by weight: 90 parts of polyether-ether-ketone resin; 30 parts of carbon fiber.
The preparation method of the wear-resistant part for protecting the easily worn unit, provided by the comparative example, comprises the following steps:
accurately metering 90 parts of dried PEEK by using a high-speed stirrer, adding the metered PEEK into a main feeding port of a double-screw extruder, adding 30 parts of carbon fiber into the double-screw extruder through a side feeding machine, and performing melt extrusion and granulation through the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batches; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batches at 140 ℃ for 4h, and setting the barrel temperature of an injection molding machine at 360 ℃ to complete injection molding to obtain the short spacer bush of the engine rocker shaft.
Comparative example 4
The wear-resistant polyether-ether-ketone material for protecting the easily worn unit comprises the following components in parts by weight: 80 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of carbon fiber.
The preparation method of the wear-resistant part for protecting the easily worn unit, provided by the comparative example, comprises the following steps:
premixing 80 parts of dried PEEK and 15 parts of crystalline flake graphite by using a high-speed stirrer, accurately metering, adding the obtained mixture into a main feeding port of a double-screw extruder, adding 15 parts of carbon fiber into the double-screw extruder through a side feeding machine, and performing melt extrusion and granulation through the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant PEEK master batches; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batches at 140 ℃ for 4h, and setting the barrel temperature of an injection molding machine at 360 ℃ to complete injection molding to obtain the short spacer bush of the engine rocker shaft.
The mechanical property test is carried out by injection molding of ISO standard sample bars, meanwhile, the wear-resistant polyether-ether-ketone master batches are injected into the short spacer bush of the rocker shaft of the engine, the wear-resistant test is carried out by referring to GB/T3960-.
TABLE 2 parts by weight of components and Performance tests in examples 1-3 and comparative examples 1-4
As can be seen from examples 1-3, when the wear-resistant polyether-ether-ketone material provided by the invention is used for opposite grinding with metal and plastic, the dynamic friction coefficient is less than 0.4, and the abrasion is less than 80 multiplied by 10-6mg/Nm. When flake graphite alone was used (see comparative example 1), the material had lower tensile strength and was more abrasive. When PTFE alone was used (see comparative example 2), the abrasion of the material was still high. When carbon fiber is used alone (see comparative example 3), although the material has high strength and low abrasion, the dynamic friction coefficient of the material is high, and the abrasion of the material and plastic causes large abrasion and failure of an abrasion piece. When the anti-wear agent composition in 2 is used (see comparative example 4), the friction coefficient and the abrasion of the material still cannot reach good levels.
Comparative example 5
The wear-resistant polyether-ether-ketone material for protecting the easily worn unit comprises the following components in parts by weight: 55 parts of polyether-ether-ketone resin; nano Al2O315 parts of (1); 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
The preparation method of the wear-resistant part for protecting the easily worn unit, provided by the comparative example, comprises the following steps:
55 parts of dried polyether-ether-ketone resin and nano Al are mixed by a high-speed mixer2O315 parts of carbon fiber and 15 parts of polytetrafluoroethylene are premixed, accurately metered and then added into a main feeding port of a double-screw extruder, 15 parts of carbon fiber is added into the double-screw extruder through a side feeding machine, and the carbon fiber is subjected to melt extrusion and granulation through the double-screw extruder at a set temperature of 360 ℃ to obtain wear-resistant polyether-ether-ketone master batches; and (3) dehumidifying and drying the obtained wear-resistant polyether-ether-ketone master batches at 140 ℃ for 4h, and setting the barrel temperature of an injection molding machine at 360 ℃ to complete injection molding to obtain the short spacer bush of the engine rocker shaft.
The wear resistance test of the short spacer bush of the rocker arm shaft of the engine prepared by the comparative example is carried out by referring to GB/T3960-2016, and the results are shown in Table 3 for the open C-shaped spacer bush and the aluminum alloy 6061 support, wherein the abrasive material of the open C-shaped spacer bush is 50% glass fiber reinforced PA6T material.
TABLE 3
Table 3 shows that the engine rocker shaft short spacer bush prepared by the comparative example has good wear resistance, but has large abrasion loss on an aluminum alloy seat, and is not suitable for the engine rocker shaft limiting piece combination comprising the 6061 aluminum alloy seat, the annular short spacer bush and the C-shaped long spacer bush provided by the invention.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A wear-resistant polyether-ether-ketone material for protecting an easily worn unit is characterized in that: the adhesive comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
2. The wear resistant polyetheretherketone material for protecting a wearable unit according to claim 1, characterized in that: the easily worn unit is 6061 aluminum alloy material.
3. The wear resistant polyetheretherketone material for protecting a wearable unit according to claim 1, characterized in that: the wear-resistant polyether-ether-ketone material comprises the following components: 55 parts of polyether-ether-ketone resin; 15 parts of flake graphite; 15 parts of polytetrafluoroethylene; 15 parts of carbon fiber.
4. The wear resistant polyetheretherketone material for protecting a wearable unit according to claim 1, characterized in that: the average grain diameter of the flake graphite is 10-200 mu m, and the specific surface area is more than 1m2(ii)/g; the average grain diameter of the polytetrafluoroethylene is 1-20 mu m, and the specific surface area is more than 2m2(ii)/g; the average fiber diameter of the carbon fiber is 2-20 μm; the length-diameter ratio of the carbon fiber is 150-1500.
5. A method for preparing a wear part for protecting a unit subject to wear, comprising the steps of:
providing a wear resistant polyetheretherketone material according to any of claims 1 to 4 for protecting an easily worn unit;
premixing dried polyether-ether-ketone, polytetrafluoroethylene and crystalline flake graphite, and adding the premixed material into a double-screw extruder through a main feeding port;
adding carbon fibers into a double-screw extruder through a side feeding port;
performing melt extrusion and granulation at the temperature of 320-370 ℃ by a double-screw extruder to obtain wear-resistant polyether-ether-ketone master batches;
and (3) dehumidifying and drying the wear-resistant polyether-ether-ketone master batch, and performing injection molding at the temperature of 320-370 ℃ to obtain the wear-resistant part for protecting the units easy to wear.
6. A short spacer bush of engine rocking arm axle which characterized in that: the long spacer bush is used for being arranged between the end surface of the long spacer bush and the 6061 aluminum alloy seat; the long spacer bush is made of glass fiber reinforced nylon material; the engine rocker shaft short spacer bush comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
7. The engine rocker shaft short spacer of claim 1 wherein the end face of the long spacer is C-shaped; the end surface of the short spacer bush of the engine rocker shaft is annular.
8. The utility model provides an engine rocking arm axle locating part combination which characterized in that: sequentially comprises the following steps: the aluminum alloy seat 6061 comprises an aluminum alloy seat, an annular short spacer bush and a C-shaped long spacer bush, wherein the long spacer bush is made of glass fiber reinforced nylon material; the short spacer bush comprises the following components in parts by weight: 55-75 parts of polyether-ether-ketone resin; 5-15 parts of flake graphite; 5-15 parts of polytetrafluoroethylene; 5-15 parts of carbon fiber.
9. The engine rocker shaft shorting sleeve as defined in claim 6 or 7, the engine rocker shaft limiting member combination as defined in claim 8, wherein: the long spacer bush is made of 50% glass fiber reinforced PA6T material.
10. An engine rocker shaft characterized by: comprising the engine rocker shaft retainer assembly of claim 8.
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| CN115678269A (en) * | 2022-09-30 | 2023-02-03 | 珠海万通特种工程塑料有限公司 | Polyamide composition and preparation method and application thereof |
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