Composition for preparing polyethylene pipe with superhigh molecular weight and preparation method thereof

Abstract

A composition for preparing polyethylene pipe with superhigh molecular weight and a preparation method thereof are disclosed. The composition is prepared by the following raw materials by weight percentage: polyethylene with superhigh molecular weight: fluoropolymer processing agent: polyethylene wax: calcium stearate / zinc stearate compound: complex antioxidant: carbon black is equal to 100 parts: 0.01-0.1: 1-8:0.1-1.0:0.1-0.5:0.5-3. The preparation method comprises the steps of: putting the polyethylene resin with superhigh molecular weight, starting a mixer, putting the calcium stearate / zinc stearate compound into the mixer to mix for 1-2 hours, then adding the complex antioxidant, polyethylene wax, fluoropolymer processing agent and carbon black to mix for 2-3 hours; and detecting the bulk density according to GB / T1636 and sealing and packaging. The polyethylene pipe composition with superhigh molecular weight prepared by the method has excellent heat-resisting and anti-aging performance with oxidation induction time at 200 DEGC longer than 30 minutes. The polyethylene pipe composition with superhigh molecular weight further has excellent mechanical, wear-resisting, corrosion resisting, heat-resisting and anti-aging properties and extrusion process performance.

Description

technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to a composition for preparing ultra-high molecular weight polyethylene pipes and a preparation method thereof. Background technique [0002] Ultra-high molecular weight Polyethylene (UHMWPE) generally refers to polyethylene (PE) with a relative molecular mass of more than 1.5 million, while the relative molecular mass of ordinary PE is generally only 20,000 to 300,000. Domestic UHMWPE The relative molecular mass can reach 4 million to 5 million, while the relative molecular mass of UHMWPE produced in Germany is as high as 10 million. [0003] The extremely high relative molecular weight of UHMWPE endows it with extremely excellent properties: [0004] ①Excellent resistance to environmental stress cracking, which is 200 times that of ordinary high-density polyethylene (HDPE) and 5-10 times that of ordinary plastics; [0005] ②Extremely strong wear resistance...

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Problems solved by technology

[0012] Chinese patents CN101134827 and CN1807062 use liquid crystal polymers to modify UHMWPE. Liquid crystal polymers have excellent mechanical properties, wear resistance and fluidity. Combining liquid crystal polymers with UHMWPE can significantly improve the processing performance of UHMWPE, and Its mechanical properties and wear resistance are improved, but the disadvantage is that the processing temperature is as high as 250-300 ° C, the energy consumption is high, and the heat and oxygen aging resistance is not mentioned in the patent. For UHMWPE pipes, the heat and oxygen aging resistance Performance is also a very important indicator, which affects the service life of the pipe

[0013] Chinese patent CN1428370 Mix 85-95% ultra-high molecular weight polyethylene, 3-15% polysiloxane, 0.2-2% antioxidant, stir evenly, and dry in a vacuum oven at 40-60°C for 5-7 hours , the dried raw materials are extruded and granulated. The fluidity of this blend is greatly improved due to the addition of silicone as a modifier. The prepared UHMWPE pipe has excellent wear resistance and corrosion resistance. and low temperature resistance, but the patent granulates the special material, the cost is high, and the heat and oxygen aging resistance is not mentioned in the patent

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