CN117343414A - Polymer friction pair material for wading working conditions and preparation method - Google Patents
Polymer friction pair material for wading working conditions and preparation method Download PDFInfo
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- CN117343414A CN117343414A CN202311220360.8A CN202311220360A CN117343414A CN 117343414 A CN117343414 A CN 117343414A CN 202311220360 A CN202311220360 A CN 202311220360A CN 117343414 A CN117343414 A CN 117343414A
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- 239000000463 material Substances 0.000 title claims abstract description 49
- 229920000642 polymer Polymers 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 229910000152 cobalt phosphate Inorganic materials 0.000 claims abstract description 68
- ZBDSFTZNNQNSQM-UHFFFAOYSA-H cobalt(2+);diphosphate Chemical compound [Co+2].[Co+2].[Co+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O ZBDSFTZNNQNSQM-UHFFFAOYSA-H 0.000 claims abstract description 68
- 239000002086 nanomaterial Substances 0.000 claims abstract description 49
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims abstract description 45
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims abstract description 45
- 239000000843 powder Substances 0.000 claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000011812 mixed powder Substances 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 9
- 239000007853 buffer solution Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 150000001868 cobalt Chemical class 0.000 claims description 5
- 239000002057 nanoflower Substances 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 239000012266 salt solution Substances 0.000 claims description 5
- QOQSIXJUYVUEMP-UHFFFAOYSA-H cobalt(2+);diphosphate;octahydrate Chemical compound O.O.O.O.O.O.O.O.[Co+2].[Co+2].[Co+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QOQSIXJUYVUEMP-UHFFFAOYSA-H 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 13
- 239000011159 matrix material Substances 0.000 abstract description 12
- 230000001050 lubricating effect Effects 0.000 abstract description 7
- 230000009471 action Effects 0.000 abstract description 4
- 238000010008 shearing Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 6
- 239000013535 sea water Substances 0.000 description 6
- 238000011068 loading method Methods 0.000 description 5
- 238000007731 hot pressing Methods 0.000 description 4
- 229940011182 cobalt acetate Drugs 0.000 description 3
- QAHREYKOYSIQPH-UHFFFAOYSA-L cobalt(II) acetate Chemical compound [Co+2].CC([O-])=O.CC([O-])=O QAHREYKOYSIQPH-UHFFFAOYSA-L 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 239000002861 polymer material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 229920010741 Ultra High Molecular Weight Polyethylene (UHMWPE) Polymers 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000002135 nanosheet Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001493 electron microscopy Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- C08K3/32—Phosphorus-containing compounds
-
- 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
-
- 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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/068—Ultra high molecular weight polyethylene
Abstract
The invention discloses a polymer friction pair material for a wading working condition and a preparation method thereof. The composite material consists of a cobalt phosphate nano material and an ultra-high molecular weight polyethylene matrix, wherein the mass fraction of the cobalt phosphate nano material is 1-10 wt%, the cobalt phosphate nano material is prepared by synthesis, and then the cobalt phosphate nano material and the ultra-high molecular weight polyethylene matrix powder are mechanically and uniformly blended. And (3) placing the mixed powder into a mould, heating, mould pressing, melting, solidifying and forming the mixed powder by adopting a hot-press forming method, and cooling and demoulding to obtain the polymer friction pair material. The invention increases the interfacial binding force with the matrix by using the granular cobalt phosphate with rough surface, so that the granular cobalt phosphate is not easy to peel off in the friction process, the capacity of the polymer matrix for bearing friction load and shearing action is enhanced, and the two-dimensional lamellar cobalt phosphate enters the friction interface to form a lubricating film, thereby obviously improving the antifriction and antiwear performance, the reliability and the service life of the composite material.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, relates to a material for manufacturing wading engineering equipment, and in particular relates to a polymer friction pair material for wading working conditions and a preparation method thereof.
Background
The traditional metal friction pair material is extremely easy to react with other media electrochemically in water environment to be corroded seriously, so that friction damage of the kinematic pair is accelerated, lubricating oil or lubricating grease is needed to be used for lubricating in the use process, and a large amount of mineral oil and noble metal resources are consumed. The problem of environmental pollution due to leakage of the oil/fat lubricant used in the metal friction pair is not negligible in view of resource saving and environmental protection. Therefore, the polymer with self-lubricating property can replace metal to be widely used as friction pair material for moving parts such as water-lubricated bearings, guide rails, gaskets and the like in the fields of marine equipment, aerospace and rail transit. Ultra High Molecular Weight Polyethylene (UHMWPE) has good self-lubricity, chemical inertness and good mechanical properties. UHMWPE is considered as a potential friction pair material for marine engineering equipment due to its non-toxicity, environmental protection and extremely low water absorption. However, the high wear of UHMWPE limits its application in the field of engineering equipment involved, and still requires further optimization. In recent years, the research shows that the nano materials have great advantages in the field of tribology, and can be used as lubricating fillers to remarkably reduce friction coefficient and play a good role in resisting abrasion. Cobalt phosphate is used as one of inorganic nano materials, and can simultaneously form two structures of nano particles with rough surfaces and two-dimensional nano sheets in the synthesis process, so that the cobalt phosphate has great potential for improving the antifriction and antiwear properties of UHMWPE materials under wading working conditions, but research reports on the influence of the cobalt phosphate as a filler on the tribological properties of polymers are not yet seen.
Disclosure of Invention
The invention aims to provide a polymer friction pair material for a wading working condition and a preparation method thereof, and the polymer friction pair material with excellent wear resistance is prepared, so that the tribological performance of the friction pair material for the wading engineering equipment under the severe working condition is greatly improved, and the service life of the friction pair material is prolonged.
The polymer friction pair material prepared by the invention is an UHMWPE base system material, and comprises 90-99 wt% of UHMWPE matrix powder and 1-10 wt% of cobalt phosphate nano material reinforcing phase powder. Firstly, dropwise adding a bivalent soluble cobalt salt solution into a stirring buffer solution with the pH of 8-12, stirring until the solution turns from purple to pink, separating and drying a precipitate to obtain a cobalt phosphate nano material, and mechanically and uniformly blending the cobalt phosphate nano material with ultra-high molecular weight polyethylene powder. And (3) placing the mixed powder into a mould, heating, mould pressing, melting, solidifying and forming the mixed powder by adopting a hot-press forming method, and cooling and demoulding to obtain the polymer friction pair material. According to the invention, by utilizing the functionality of different structures of the cobalt phosphate nano material, the granular cobalt phosphate with rough surface increases the interfacial binding force with the matrix, so that the granular cobalt phosphate is not easy to peel off in the friction process, the capability of the polymer matrix for bearing friction load and shearing action is enhanced, and the two-dimensional lamellar cobalt phosphate enters the friction interface to form a lubricating film, so that the antifriction and antiwear performances of the composite material are remarkably improved.
The technical scheme adopted by the invention for achieving the purpose is as follows:
the invention provides a polymer friction pair material for a wading working condition, which consists of ultra-high molecular weight polyethylene and cobalt phosphate nano materials.
As a preferable technical scheme, the cobalt phosphate is a cobalt phosphate octahydrate nanoflower, and is of a spherical structure formed by gathering thick plates with different growth directions, and each thick plate is formed by stacking nanoscale multi-layer thin plates.
As a preferable technical scheme, the ultra-high molecular weight polyethylene and the cobalt phosphate nano material are all in powder form. As a preferable technical scheme, the preparation principle of the cobalt phosphate is as follows:
and (3) dropwise adding the bivalent soluble cobalt salt solution into the stirring buffer solution with the pH of 8-12, stirring until the solution turns from purple to pink, separating precipitate and drying to obtain the cobalt phosphate nano material, namely cobalt phosphate nano material powder.
As a preferable technical scheme, the forming principle of the polymer friction pair material is as follows:
the ultra-high molecular weight polyethylene powder and the fully dried cobalt phosphate nano material powder are mechanically mixed, cured and molded through a hot press to form the antifriction and wear-resistant polymer material for wading engineering equipment, and the corresponding component is obtained through a die with a required shape and structure.
According to the invention, by utilizing the functionality of different structures of the cobalt phosphate nano material, the two-dimensional lamellar cobalt phosphate deposited by the multilayer nano sheets increases the interfacial binding force with the matrix, so that the two-dimensional lamellar cobalt phosphate is not easy to peel off in the friction process, the friction load and shearing action bearing capacity of the polymer matrix is enhanced, and the cobalt phosphate enters the friction interface to form a lubricating film, so that the antifriction and antiwear performances of the composite material are remarkably improved. The prepared polymer friction pair material has important significance for improving the reliability of the polymer friction pair component under the wading working condition and prolonging the service life of the polymer friction pair component.
The invention also provides a preparation method of the polymer friction pair material, which comprises the following steps:
step 1, preparing a cobalt phosphate nano material;
step 2, selecting and preparing ultra-high molecular weight polyethylene powder; selecting cobalt phosphate nano material powder;
step 3, uniformly mixing the ultra-high molecular weight polyethylene powder obtained in the step 2 with the cobalt phosphate nano material powder to form mixed powder;
and 4, placing the mixed powder into a die, pre-pressing, solidifying and forming the mixed powder by adopting a hot press, and finally cooling and demolding the mixed powder.
Preferably, the preparation process of the cobalt phosphate nano material in the step 1 is as follows:
firstly, dropwise adding a bivalent soluble cobalt salt solution into a stirring buffer solution with the pH of 8-12, stirring until the solution turns from purple to pink, separating a precipitate and drying to obtain the cobalt phosphate nano material.
Preferably, the alkaline buffer solution is disodium hydrogen phosphate solution.
Preferably, the divalent soluble cobalt salt solution is cobalt acetate.
The cobalt phosphate nano material is an octahydrated cobalt phosphate nano flower, and the microstructure of the octahydrated cobalt phosphate nano flower is as follows: the spherical structure is formed by gathering thick slices with different growth directions, and each thick slice is formed by stacking nanoscale multi-layer slices.
Preferably, the flakes have a thickness of 3-10 nanometers.
Preferably, the spherical structure of the cobalt phosphate octahydrate nanoflowers has a diameter of 3-15 microns.
Preferably, the specific steps in the step 2 are as follows: weighing a certain amount of raw materials according to the weight proportion, mixing, namely weighing a certain amount of ultra-high molecular weight polyethylene powder and cobalt phosphate nano material powder, and mechanically blending for 1-2 hours by using a planetary ball mill.
Preferably, the mixed powder is dried by a drying oven at 50-60 ℃ before being hot-pressed in a die.
Preferably, in step 3, the molding process: loading the dried blended powder raw materials into a die, and prepressing for 2-5 times with 30-50 MPa pressure for 3-5 min each time; setting the temperature of the die to 160-180 ℃ after the prepressing is finished, starting to heat the die, and stopping heating after the temperature is kept for 2-4 hours when the temperature displayed by a temperature controller reaches the set temperature; naturally cooling the die in air, and applying pressure of 20-30 MPa to maintain pressure when the temperature of the temperature controller is displayed as 107-113 ℃; cooling to 97-103 ℃ at equal temperature, and applying pressure of 40-50 MPa for pressure maintaining; cooling to 87-93 deg.c at constant temperature and pressure maintaining at 70-80 MPa; cooling to 77-83 ℃ at equal temperature, and applying pressure of 120-150 MPa for pressure maintaining; and (5) releasing pressure and demoulding when the mould is naturally cooled to room temperature.
Preferably, the ultra-high molecular weight polyethylene and the cobalt phosphate nano material are all in powder form, and the two powder materials are subjected to melt solidification molding through a hot press after being physically blended to prepare the polymer friction pair material for engineering equipment.
Preferably, the content of the cobalt phosphate nano material in the polymer friction pair material is 1-10 wt%.
The invention has the beneficial effects that:
(1) The invention selects ultra-high molecular weight polyethylene (UHMWPE) powder as a base material, and adds cobalt phosphate nano material into the base material to carry out hot press molding to obtain an UHMWPE antifriction and antiwear polymer material sample for wading engineering equipment. Based on the functionality of different structures of the cobalt phosphate nano material, the granular cobalt phosphate with rough surface increases the interfacial binding force with the UHMWPE matrix, so that the UHMWPE matrix is not easy to peel off in the friction process, the capacity of the UHMWPE matrix for bearing friction load and shearing action is enhanced, and the two-dimensional lamellar cobalt phosphate enters the friction interface to form a lubricating film, so that the antifriction and antiwear performance of the composite material is remarkably improved.
(2) Compared with pure UHMWPE material, the UHMWPE composite material has obvious antifriction change under the seawater lubrication condition. The UHMWPE composite material is subjected to a tribological test under the seawater lubrication working condition, and the friction coefficient and the wear rate of the composite material are lower than those of the pure UHMWPE material, so that the prepared UHMWPE composite material has better self-lubricating performance and wear resistance in a wading environment.
Drawings
FIG. 1a is a scanning electron microscope image at 2000 Xmagnification of a cobalt phosphate nanomaterial prepared in example 1 of the present invention;
FIG. 1b is a 18000 Xmagnification scanning electron microscope image of the cobalt phosphate nanomaterial prepared in example 1 of the present invention;
FIG. 1c is a 18000 magnification of another view angle scanning electron microscope image of the cobalt phosphate nanomaterial prepared in example 1 of the present invention;
fig. 2 is a graph showing the relationship between the friction coefficient and the friction time of an UHMWPE friction pair material for wading engineering equipment in the invention under a seawater lubrication working condition, wherein a curve comparative example 1 in the graph is a friction coefficient curve of a pure UHMWPE material for the prepared wading engineering equipment, and curve examples 1-3 are friction coefficient curves of UHMWPE antifriction polymer friction pair materials for the prepared wading engineering equipment;
fig. 3 is a graph showing the abrasion volume of the composite material under the seawater lubrication condition of the friction pair material of the UHMWPE antifriction polymer for wading engineering equipment prepared in comparative example 1 and examples 1 to 3.
Detailed Description
In order to further illustrate the technical means and effects adopted by the invention to achieve the preset aim, the following is a detailed description of a specific embodiment of a polymer friction pair material for a wading working condition and a preparation method according to the invention with reference to the accompanying drawings and application examples. The following comparative examples and examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Comparative example 1: and (3) carrying out hot pressing and curing on the ultra-high molecular weight polyethylene powder and the cobalt phosphate nano material powder: the cobalt phosphate nanomaterial feedstock was weighed to a total weight percent of 0wt.% and the UHMWPE feedstock powder was 100wt.% and mechanically milled using a planetary ball mill for blending for 1 hour. The powder was then dried at 50℃for 12h. The molding process is performed as follows: loading the dried raw materials into a die, and prepressing for 3 times with 30MPa pressure for 3min each time; setting the temperature of the die to 165 ℃ after the prepressing is finished, starting to heat the die, and stopping heating after the temperature is kept for 3 hours when the temperature of the die reaches the set temperature; naturally cooling the die in air, and when the temperature of the temperature controller is 110 ℃, maintaining the pressure under the application pressure of 24 MPa; cooling to 100 ℃ at equal temperature, and applying 46MPa of pressure maintaining; isothermal cooling to 90 ℃, and applying pressure of 77MPa for pressure maintaining; isothermal cooling to 80 ℃, and applying pressure 126MPa for pressure maintaining; and (3) when the die is naturally cooled to room temperature, releasing pressure and demolding to obtain the UHMWPE material.
Example 1:
s1, preparing a cobalt phosphate nano material: firstly preparing a disodium hydrogen phosphate solution buffer solution with the pH value of 9, continuously stirring at the speed of 180 revolutions per minute, then adding a cobalt acetate solution (the volume ratio of the cobalt acetate solution to the buffer solution is 0.5:1) into the buffer solution which keeps stirring, continuously stirring until the solution turns from purple to pink, separating and repeatedly washing a precipitate, drying at the temperature of 60 ℃ for 48 hours to obtain a cobalt phosphate nano material, and carrying out electron microscopy characterization on the cobalt phosphate nano material as shown in figures 1a to 1 c.
S2, hot pressing and curing ultra-high molecular weight polyethylene powder and cobalt phosphate nano material powder: the cobalt phosphate nanomaterial feedstock and the UHMWPE feedstock powder were weighed to a total weight percent of 1wt.% and mechanically milled and blended for 1h using a planetary ball mill. The powder was then dried at 50℃for 12h. The molding process is performed as follows: loading the dried raw materials into a die, and prepressing for 3 times with 30MPa pressure for 3min each time; setting the temperature of the die to 165 ℃ after the prepressing is finished, starting to heat the die, and stopping heating after the temperature is kept for 3 hours when the temperature of the die reaches the set temperature; naturally cooling the die in air, and when the temperature of the temperature controller is 110 ℃, maintaining the pressure under the application pressure of 24 MPa; cooling to 100 ℃ at equal temperature, and applying 46MPa of pressure maintaining; isothermal cooling to 90 ℃, and applying pressure of 77MPa for pressure maintaining; isothermal cooling to 80 ℃, and applying pressure 126MPa for pressure maintaining; and (3) when the die is naturally cooled to room temperature, releasing pressure and demolding to obtain the polymer friction pair material for wading engineering equipment.
Example 2:
s1, preparing a cobalt phosphate nano material, which is shown in the embodiment 1.
S2, hot pressing and curing ultra-high molecular weight polyethylene powder and cobalt phosphate nano material powder: the cobalt phosphate nanomaterial feedstock was weighed to a total weight percent of 5wt.% and the UHMWPE feedstock powder was 95wt.% and mechanically milled using a planetary ball mill for blending for 1 hour. The powder was then dried at 50℃for 12h. The molding process is performed as follows: loading the dried raw materials into a die, and prepressing for 3 times with 30MPa pressure for 3min each time; setting the temperature of the die to 165 ℃ after the prepressing is finished, starting to heat the die, and stopping heating after the temperature is kept for 3 hours when the temperature of the die reaches the set temperature; naturally cooling the die in air, and when the temperature of the temperature controller is 110 ℃, maintaining the pressure under the application pressure of 24 MPa; cooling to 100 ℃ at equal temperature, and applying 46MPa of pressure maintaining; isothermal cooling to 90 ℃, and applying pressure of 77MPa for pressure maintaining; isothermal cooling to 80 ℃, and applying pressure 126MPa for pressure maintaining; and (3) when the die is naturally cooled to room temperature, releasing pressure and demolding to obtain the polymer friction pair material for wading engineering equipment.
Example 3:
s1, preparing a cobalt phosphate nano material, which is shown in the embodiment 1.
S2, hot pressing and curing ultra-high molecular weight polyethylene powder and cobalt phosphate nano material powder: the cobalt phosphate nanomaterial feedstock was weighed to a total weight percent of 10wt.% and the UHMWPE feedstock powder was 90wt.% and mechanically milled using a planetary ball mill for blending for 1 hour. The powder was then dried at 50℃for 12h. The molding process is performed as follows: loading the dried raw materials into a die, and prepressing for 3 times with 30MPa pressure for 3min each time; setting the temperature of the die to 165 ℃ after the prepressing is finished, starting to heat the die, and stopping heating after the temperature is kept for 3 hours when the temperature of the die reaches the set temperature; naturally cooling the die in air, and when the temperature of the temperature controller is 110 ℃, maintaining the pressure under the application pressure of 24 MPa; cooling to 100 ℃ at equal temperature, and applying 46MPa of pressure maintaining; isothermal cooling to 90 ℃, and applying pressure of 77MPa for pressure maintaining; isothermal cooling to 80 ℃, and applying pressure 126MPa for pressure maintaining; and (3) when the die is naturally cooled to room temperature, releasing pressure and demolding to obtain the polymer friction pair material for wading engineering equipment.
The tribological properties of the UHMWPE composite samples prepared in comparative example 1 and examples 1-3 were compared, and the results are shown in FIGS. 2-3.
The tribology test under the seawater lubrication working condition is carried out on a pin-disc friction and wear testing machine, the pair parts of the kinematic pair are balls with phi 8mm of GCr15 bearing steel, the working load is 30N, the speed is 1.10m/s (rotating speed 500 r/min), the rotating radius is 21mm, and the working time is 30min.
As shown in fig. 2 to 3, it can be seen that the pure UHMWPE sample of comparative example 1 and the UHMWPE composite sample of example 1 have a reduced coefficient of friction and significantly reduced wear volume. The UHMWPE composite material prepared by the invention has more excellent antifriction and wear-resistant performance under the seawater lubrication working condition within the range of weighing cobalt phosphate nano material powder with the total weight percentage of 1-10 wt.% and UHMWPE raw material powder with the total weight percentage of 90-99 wt.%.
The above embodiments are only for illustrating the present invention, and are not limiting of the present invention. While the invention has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various combinations, modifications, and substitutions can be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A polymer friction pair material for a wading working condition is characterized in that: consists of ultra-high molecular weight polyethylene and cobalt phosphate.
2. A polymeric friction pair material for use in a wet condition as defined in claim 1, wherein: the cobalt phosphate is a cobalt phosphate octahydrate nanoflower, and is of a spherical structure formed by gathering thick sheets with different growth directions, and each thick sheet is formed by stacking nanoscale multilayer sheets.
3. A polymeric friction pair material for use in a wet condition as defined in claim 1, wherein: the preparation method of the cobalt phosphate comprises the following steps: and (3) dropwise adding the bivalent soluble cobalt salt solution into the stirring buffer solution with the pH of 8-12, stirring until the solution turns from purple to pink, separating precipitate and drying to obtain the cobalt phosphate nano material.
4. A polymeric friction pair material for use in a wet condition as defined in claim 1, wherein: the content of the cobalt phosphate nano material in the polymer friction pair material is 1-10 wt%.
5. A method of preparing a polymeric friction pair material for use in a wading regime as claimed in any one of claims 1 to 4, comprising the steps of:
step 1, preparing a cobalt phosphate nano material;
step 2, selecting and preparing ultra-high molecular weight polyethylene powder; selecting cobalt phosphate nano material powder;
step 3, uniformly mixing the ultra-high molecular weight polyethylene powder obtained in the step 2 with the cobalt phosphate nano material powder to form mixed powder;
and 4, placing the mixed powder into a die, pre-pressing, solidifying and forming the mixed powder by adopting a hot press, and finally cooling and demolding the mixed powder.
6. A polymeric friction pair material for use in a wet-on-wet condition as defined in claim 5, wherein: before the mixed powder is hot pressed in a die, the mixed powder is dried by a drying oven at 50-60 ℃.
7. A polymeric friction pair material for use in a wet-on-wet condition as defined in claim 5, wherein: in the step 4, the pre-pressing pressure is 30-50 MPa; prepressing for 2-5 times and 3-5 min each time.
8. A polymeric friction pair material for use in a wet condition as defined in claim 7, wherein: in the step 4, the setting temperature of the die for curing and forming is 160-180 ℃, and the curing time is kept for 2-4 hours.
9. A polymeric friction pair material for use in a wet condition as defined in claim 8, wherein: in the step 4, during solidification and molding, after heat preservation is carried out for 2-4 hours, heating of the die is stopped, the die is placed in air for natural cooling, and in the cooling process, the pressure of a hot press is gradually increased according to the temperature reduction of the die until the hot press pressure is 120-150 MPa for pressure maintaining; and (3) when the die is naturally cooled to room temperature, releasing pressure and demoulding to obtain the polymer friction pair material.
10. The method for preparing the polymer friction pair material for the wading working condition according to claim 9, which is characterized by comprising the following steps: the pressing parameters of the hot press in the cooling process in the step 4 are as follows: when the temperature of the temperature controller is displayed as 107-113 ℃, the pressure is applied for maintaining the pressure at 20-30 MPa; cooling to 97-103 ℃ at equal temperature, and applying pressure of 40-50 MPa for pressure maintaining; cooling to 87-93 deg.c at constant temperature and pressure maintaining at 70-80 MPa; cooling to 77-83 deg.c, applying 120-150 MPa pressure maintaining until cooling to normal temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311220360.8A CN117343414A (en) | 2023-09-20 | 2023-09-20 | Polymer friction pair material for wading working conditions and preparation method |
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| CN202311220360.8A CN117343414A (en) | 2023-09-20 | 2023-09-20 | Polymer friction pair material for wading working conditions and preparation method |
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| CN117343414A true CN117343414A (en) | 2024-01-05 |
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| CN202311220360.8A Pending CN117343414A (en) | 2023-09-20 | 2023-09-20 | Polymer friction pair material for wading working conditions and preparation method |
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|---|---|
| CN (1) | CN117343414A (en) |
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2023
- 2023-09-20 CN CN202311220360.8A patent/CN117343414A/en active Pending
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