CN111234352A - Wear-resistant ultrahigh molecular weight polyethylene composite material filled with flaky silver-coated copper - Google Patents
Wear-resistant ultrahigh molecular weight polyethylene composite material filled with flaky silver-coated copper Download PDFInfo
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Abstract
The invention discloses a wear-resistant ultra-high molecular weight polyethylene composite material filled with flaky silver-coated copper, which is prepared by stirring and dispersing flaky silver-coated copper and ultra-high molecular weight polyethylene in industrial alcohol according to the mass percent of 1-10% and 90-99%, performing ultrasonic mixing uniformly, performing suction filtration, and drying to obtain mixed powder; and pouring the mixed powder into a mold, carrying out hot press molding, naturally cooling to 60-80 ℃, and demolding to obtain the ultrahigh molecular weight polyethylene composite material. According to the invention, the flaky silver-coated copper particles with high temperature resistance, high heat conductivity and excellent tribological property are adopted to modify the ultra-high molecular weight polyethylene, and the flaky silver-coated copper particles are uniformly and compactly coated with flaky silver on the surfaces of the copper powder particles, so that the composite material has good heat conductivity, heat generated in the friction process can be released, frictional heat generation under high load is effectively reduced, and the wear resistance of the composite material is improved.
Description
Technical Field
The invention relates to an ultra-high molecular weight polyethylene composite material, in particular to a wear-resistant ultra-high molecular weight polyethylene composite material modified by filling flaky silver-coated copper, and belongs to the field of composite materials and the technical field of wear-resistant materials.
Background
The ultra-high molecular weight polyethylene is high-density polyethylene with relative molecular mass more than 150 ten thousand, has good lubricating property, impact resistance and chemical stability, but has low hardness, low strength, poor creep resistance and heat conductivity, large size shrinkage rate, and can improve the abrasion resistance service life under severe working conditions of high pressure, high speed and the like only by modifying. Therefore, when the ultra-high molecular weight polyethylene is used as a resin matrix to prepare the polymer self-lubricating composite material, the fiber, the lubricant, the nano filler and other auxiliary agents are usually mixed, filled and modified. At present, the filler of the single filler filled ultra-high molecular weight polyethylene composite material mainly comprises molybdenum disulfide, carbon nanotubes and graphene; the composite filler filled ultra-high molecular weight polyethylene composite material mainly adopts the combination of carbon nano tubes and graphene, carbon fibers and nano BN, silicon dioxide, alumina, calcium carbonate, montmorillonite, wollastonite and glass beads. The process of preparing the ultra-high molecular weight polyethylene composite material by modifying the nano fillers is relatively complex, the cost is high, and the performance needs to be improved.
Because the ultra-high molecular weight polyethylene is a poor thermal conductor, the friction heat generation is serious and the abrasion is aggravated in the high-load friction process. By selecting the functional filler with high heat conduction, friction reduction and wear resistance, the heat generated in the friction process is effectively transferred out, and the wear resistance can be obviously improved.
The silver-coated copper powder is prepared by forming silver coatings with different thicknesses on the surface of superfine copper powder by adopting an advanced chemical plating technology and a specific forming and surface treatment process. The copper powder has the characteristics of overcoming the characteristic that the copper powder is easy to oxidize, and has the characteristics of good conductivity, high chemical stability, difficult oxidation, low price and the like, is a high-conductivity filler with a good development prospect, is widely applied to the fields of electricity, optics and the like, but has no related patent and literature publication reports at present when being used as a tribology modifier.
Disclosure of Invention
The invention aims to provide a wear-resistant ultrahigh molecular weight polyethylene composite material filled with flaky silver-coated copper and a preparation method thereof.
The invention relates to a wear-resistant ultra-high molecular weight polyethylene composite material filled with flake silver-coated copper, which is prepared from the following components by the following process:
the component ratio is as follows: 90-99% of ultra-high molecular weight polyethylene and 1-10% of flake silver-coated copper. Wherein the relative molecular mass of the ultra-high molecular weight polyethylene is 900 ten thousand, and the particle size is 150-250 mu m; the average grain diameter of the flaky silver-coated copper is 1-3 mu m, the silver content is 10-20%, and the purity is more than 99.9%.
The preparation process comprises the following steps:
(1) mixing materials: firstly, ultrasonically stirring and dispersing flake silver-coated copper in industrial alcohol, then adding ultra-high molecular weight polyethylene, continuously and ultrasonically stirring to fully and uniformly mix the flake silver-coated copper, and then carrying out suction filtration and drying to obtain mixed powder; an ultrasonic cleaning machine is adopted for ultrasonic stirring, the power is 500W, and the stirring speed is 200 rpm;
(2) hot-press molding: pouring the mixed powder into a mold, and performing hot press molding, wherein the hot press molding is performed for 90-150 min at 190-210 ℃ and under the pressure of 5-10 MPa;
(3) and (3) cooling: and naturally cooling to 60-80 ℃, and demolding to obtain the ultrahigh molecular weight polyethylene composite material. And the pressure is kept at 10-15 MPa in the cooling process to ensure the dimensional stability and avoid the warping, collapse and deformation of the surface of the material in the cooling process.
Second, tribology Performance testing
The test method comprises the following steps: GB/T3960, 300N, 200rpm, 120 min.
And (3) testing results: the volume wear rate is less than or equal to 3.00 multiplied by 10-5mm3/N.m
The tribology performance test result shows that the wear resistance of the polymer composite material can be obviously improved by filling the flaky silver-coated copper into the ultra-high molecular weight polyethylene composite material.
FIG. 1 is a graph showing the volumetric wear rate of ultra-high molecular weight polyethylene composites prepared by adding different amounts of flake silver coated copper. As can be seen from fig. 1, the friction coefficient and wear rate of the ultra-high molecular weight polyethylene can be significantly reduced by adding the flake silver-coated copper. With the increase of the addition amount of the flake silver-coated copper, the volume wear rate of the ultra-high molecular weight polyethylene composite material is also obviously reduced; when the filling amount of the flake silver-coated copper reaches 5wt.%, the volume wear rate of the ultra-high molecular weight polyethylene composite material reaches the lowest; when the filling amount of the flake silver-coated copper is continuously increased, the volume wear rate of the ultra-high molecular weight polyethylene composite material is increased. Therefore, the loading of the flake silver-coated copper should be controlled to be 1 to 10 wt.%.
In conclusion, the flaky silver-coated copper particles modified ultra-high molecular weight polyethylene with high temperature resistance, high heat conduction and excellent tribological performance are adopted, and the flaky silver-coated copper particles are coated on the surfaces of the copper powder particles successfully and uniformly and compactly, so that the composite material has good heat conductivity, heat generated in the friction process can be released, the frictional heat generation under high load is effectively reduced, and the wear resistance of the composite material is improved.
Drawings
FIG. 1 is a graph showing the volumetric wear rate profiles of the ultra high molecular weight polyethylene composites prepared in examples 1 to 4 and comparative example 1.
Detailed Description
The preparation and wear resistance of the wear-resistant ultra-high molecular weight polyethylene composite material of the invention are further described by the following specific examples.
Example 1
(1) The raw material ratio is as follows: accurately weighing 99g of ultrahigh molecular weight polyethylene and 1g of flaky silver-coated copper;
(2) the preparation process comprises the following steps: adding flake silver-coated copper into 100ml of industrial alcohol, ultrasonically stirring for 0.5 hour, then adding ultra-high molecular weight polyethylene, continuously ultrasonically stirring for 0.5 hour, fully and uniformly mixing, performing suction filtration, and drying to obtain mixed powder; pouring the mixed powder into a mould for hot-pressing molding: keeping the temperature and the pressure at 190 ℃ and 10MPa for 150 min; naturally cooling to 80 ℃ (keeping the pressure at 10Mpa in the cooling process), and demolding to obtain the wear-resistant ultrahigh molecular weight polyethylene composite material;
(3) abrasion resistance: volumetric wear rate of 3.00X 10-5mm3N.m (GB/T3960, 300N, 200rpm, 120 min), higher pure ultra-high molecular weight polyethylene volumetric wear rate (3.48X 10)-5mm3N.m) by 13.8%.
Example 2
(1) The raw material ratio is as follows: accurately weighing 97g of ultrahigh molecular weight polyethylene and 3g of flaky silver-coated copper;
(2) the preparation process comprises the following steps: adding flake silver-coated copper into 300ml of industrial alcohol, ultrasonically stirring for 0.6 hour, then adding ultra-high molecular weight polyethylene, continuously ultrasonically stirring for 0.6 hour, fully and uniformly mixing, performing suction filtration, and drying to obtain mixed powder; and pouring the mixed powder into a mould for hot-pressing molding: keeping the temperature and the pressure at 195 ℃ and 8MPa for 140 min; then naturally cooling to 75 ℃ (keeping the pressure at 12Mpa in the cooling process), and demoulding to obtain the wear-resistant ultrahigh molecular weight polyethylene composite material;
(3) abrasion resistance: volumetric wear rate of 2.45X 10-5mm3The volume wear rate of the purer ultra-high molecular weight polyethylene is reduced by 29.6 percent (GB/T3960, 300N, 200rpm, 20 min).
Example 3
(1) The raw material ratio is as follows: accurately weighing 95g of ultrahigh molecular weight polyethylene and 5g of flaky silver-coated copper;
(2) the preparation process comprises the following steps: firstly, adding the flake silver-coated copper into 300ml of industrial alcohol, and ultrasonically stirring for 0.7 hour; adding ultra-high molecular weight polyethylene, continuing to stir for 0.7 hour by ultrasound, fully and uniformly mixing, performing suction filtration, and drying to obtain mixed powder; and pouring the mixed powder into a mould for hot-pressing molding: keeping the temperature and the pressure at 200 ℃ and 7MPa for 120 min; then naturally cooling to 70 ℃ (maintaining the pressure at 14Mpa in the cooling process), demolding at room temperature to obtain the ultra-high molecular weight polyethylene composite material;
(3) abrasion resistance: volumetric wear rate 1.95X 10-5mm3The volume wear rate of the purer ultra-high molecular weight polyethylene is reduced by 43.9 percent (GB/T3960, 300N, 200rpm, 20 min).
Example 4
(1) The raw material ratio is as follows: accurately weighing 90g of ultrahigh molecular weight polyethylene and 10g of flaky silver-coated copper;
(2) the preparation process comprises the following steps: firstly, adding flake silver-coated copper into 500ml of industrial alcohol, and ultrasonically stirring for 1 hour; adding ultra-high molecular weight polyethylene, continuing to stir for 1 hour by ultrasound, fully and uniformly mixing, and then carrying out suction filtration and drying to obtain mixed powder; and pouring the mixed powder into a mould for hot-pressing molding: keeping the temperature and the pressure at 210 ℃ and 5MPa for 90 min; then naturally cooling to 65 ℃ (keeping the pressure at 15MPa in the cooling process), demolding at room temperature to obtain the ultra-high molecular weight polyethylene composite material;
(3) abrasion resistance: volumetric wear rate of 2.30X 10-5mm3The volume wear rate of the purer ultrahigh molecular weight polyethylene material is reduced by 33.9 percent (GB/T3960, 300N, 200rpm, 20 min).
In the above embodiments, the relative molecular mass of the ultra-high molecular weight polyethylene is 900 ten thousand, and the particle size is 150 to 250 μm; the average grain diameter of the flaky silver-coated copper is 1-3 mu m, the silver content is 10-20%, and the purity is more than 99.9%.
Claims (6)
1. A wear-resistant ultra-high molecular weight polyethylene composite material filled with flaky silver-coated copper is prepared from the following components by the following process:
the component ratio is as follows: 90-99% of ultra-high molecular weight polyethylene and 1-10% of flake silver-coated copper;
the preparation process comprises the following steps: the method comprises the following steps:
(1) mixing materials: firstly, ultrasonically stirring and dispersing flake silver-coated copper in industrial alcohol, then adding ultra-high molecular weight polyethylene, continuously and ultrasonically stirring to fully and uniformly mix the flake silver-coated copper, and then carrying out suction filtration and drying to obtain mixed powder;
(2) hot-press molding: pouring the mixed powder into a mould, and performing hot press molding;
(3) and (3) cooling: and naturally cooling to 60-80 ℃, and demolding to obtain the ultrahigh molecular weight polyethylene composite material.
2. The silver-clad copper-filled flake wear-resistant ultrahigh molecular weight polyethylene composite material of claim 1, wherein: the relative molecular mass of the ultrahigh molecular weight polyethylene is 900 ten thousand, and the particle size is 150-250 mu m.
3. The silver-clad copper-filled flake wear-resistant ultrahigh molecular weight polyethylene composite material of claim 1, wherein: the average grain diameter of the flaky silver-coated copper is 1-3 mu m, the silver content is 10-20%, and the purity is more than 99.9%.
4. The silver-clad copper-filled flake wear-resistant ultrahigh molecular weight polyethylene composite material of claim 1, wherein: the ultrasonic stirring adopts an ultrasonic cleaning machine, the power is 500W, and the stirring speed is 200 rpm.
5. The silver-clad copper-filled flake wear-resistant ultrahigh molecular weight polyethylene composite material of claim 1, wherein: the hot-press forming is carried out at 190-210 ℃ and 5-10 MPa for 90-150 min under heat preservation and pressure maintaining.
6. The silver-clad copper-filled flake wear-resistant ultrahigh molecular weight polyethylene composite material of claim 1, wherein: and keeping the pressure at 10-15 Mpa in the natural cooling process.
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2020
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| EP1108806A1 (en) * | 1999-12-14 | 2001-06-20 | Andreas Bodmer | Airjet texturing or intermingling of multifilament-monofilament hybrid yarn |
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