A kind of high wear-resistant high-lubricating polyethylene product and its preparation method
A polyethylene and high wear-resistant technology, which is applied in the field of high wear-resistant and high-lubricating polyethylene products and its preparation, can solve the problems of high cost, complicated process, and high cost, and achieve improved wear resistance, simple process flow, and low production cost. low effect
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[0034] A preparation method of high wear-resistant and high-lubricating polyethylene products, using the wear-resistant polyethylene raw material with a wide molecular weight distribution obtained directly through ethylene polymerization, and preparing high wear-resistant and high-lubricating polyethylene through melt extrusion processing or injection molding products.
[0035] In one embodiment, the weight average molecular weight Mw of the wear-resistant polyethylene material is preferably 300,000-800,000, the molecular weight distribution Mw / Mn≥8 (more preferably, the molecular weight distribution Mw / Mn≥8, and the molecular weight distribution Mw / Mn≤40 ), the raw material is loaded at 21.6kg, the range of melt index at 190°C is 0.1-5g / 10min, and the density after melting is 0.92-0.97g / cm 3 . When producing high wear-resistant and high-lubricating polyethylene products through melt extrusion processing, the above-mentioned wear-resistant polyethylene raw materials are prefe...
Embodiment approach
[0042] In one embodiment, auxiliary agents may also be added during the processing, and the auxiliary agents include antioxidants, and / or colorants, and / or inorganic fillers, and / or flame retardants and the like.
[0043] In one embodiment, the high wear-resistant and high-lubrication polyethylene products include high-wear-resistant and high-lubrication polyethylene pipes, rods, plates or profiled materials.
[0044] In one embodiment, the preparation method of wear-resistant polyethylene raw materials, preferably, ethylene is polymerized under the action of a catalyst to obtain the polyethylene powder, and the polymerization process includes a gas phase process, and / or a condensed state process, and / or Liquid phase process, etc.
[0045] In one embodiment, the catalyst preferably includes a magnesium-titanium catalyst, and / or a chromium catalyst, and / or a metallocene catalyst, and / or a late transition metal catalyst.
[0046] In one embodiment, the polyethylene molecular ch...
Embodiment 1
[0053] Load bis(2,6-dimethylphenyldiimine) nickel dibromide on the chromium-containing silica gel carrier activated at high temperature to obtain a multi-active center catalyst, which is carried out under ethylene monomer and nitrogen atmosphere Polymerization reaction, the reaction is carried out slurry polymerization through a slurry tank reactor, the polymerization reaction temperature is 85 ° C, the polymerization reaction time is 3 hours, the polymerization reaction diluent is selected from normal hexane, and the molar ratio of the late transition metal compound and the chromium compound is 5: 95.
[0054] The polyethylene raw material obtained by polymerization has a weight-average molecular weight of 800,000, a Mw / Mn of 29.8, and a thousand-carbon methyl group of 1-3. The raw material is loaded at 21.6kg, and the melt index at 190°C is 0.2g / 10min. The density is 0.965g / cm 3 . The raw material and antioxidant 1010 were mechanically blended at a mass ratio of 99.6:0.4, ...
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Abstract
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