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Ultrahigh molecular weight polyethylene composition capable of being extrusion molded and its preparation process

An ultra-high molecular weight, extrusion molding technology, applied in the field of ultra-high molecular weight polyethylene composition and its preparation, can solve the problems of application and popularization restrictions, many processing aids, poor adaptability, etc., and achieve simple compounding method and high processing temperature Low, the effect of maintaining mechanical properties

Inactive Publication Date: 2008-02-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This special material improves the processing fluidity of ultra-high molecular weight polyethylene, but because the price of liquid crystal polymer raw materials is much higher than that of pure UHMWPE, the application and promotion of this method are limited
[0006] Chinese patent 9919536 has reported a kind of ultra-high molecular weight polyethylene composition that can be processed by extrusion, and it is made of high molecular weight polyethylene, decahydronaphthalene, low molecular weight polyethylene, amide lubricant and nanometer silicon dioxide or It is made of a mixture of aluminum oxide and can be extruded in a general-purpose extruder, but this method uses too many processing aids and the strength is reduced
It overcomes the problem that ultra-high molecular weight polyethylene cannot be extruded due to its great adhesion and easy degradation by shearing
Its disadvantage is that the manufacture of equipment is expensive and its adaptability to different brands of raw materials is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Add 100 g of polyethylene glycol with a molecular weight of 2000 and 50 g of montmorillonite with an average particle size of 100 nm into a high-speed mixer, seal it, stir at a high speed of 70 ° C for 10 minutes, and discharge after cooling to obtain composite processing Auxiliary MP I, then 90g of ultra-high molecular weight polyethylene with a molecular weight of 2.50±500,000 and 10g of polypropylene (F401) with MI=2.3g / min, 3g of compound processing aid MP I, 0.5g of sodium benzoate, 2, 0.3 g of 6-di-tert-butyl-4-ethylphenol and 0.3 g of glycerol trihydroxystearate were uniformly mixed, and granulated by twin-screw extrusion. The extrusion temperature of each section from the feed inlet to the discharge outlet is: 170-200°C, 190°C-220°C, 200°C-220°C, 180°C-220°C. The properties of the obtained pellets are shown in Table 1.

Embodiment 2

[0036] Embodiment 2: the molecular weight is 350 ± 500,000 ultra-high molecular weight polyethylene 80g and the polypropylene (F401) 20g of MI=2.3g / min, composite processing aid MP I 4g, talcum powder 0.2g, 4-methylol 0.2 g of base-2,6-di-tert-butylphenol and 0.2 g of oxidized polyethylene wax were uniformly mixed, and pelletized by twin-screw extrusion. All the other components and operating conditions are with embodiment 1 in the prescription. The results are shown in Table 1.

Embodiment 3

[0037] Embodiment 3: the molecular weight is 450 ± 500,000 ultra-high molecular weight polyethylene 70g and polypropylene (F401) 30g of MI=2.3g / min, composite processing aid MP I 5g, mica 1.0g, phosphorous acid tris(2 , 1.0 g of 4-di-tert-butylphenyl) ester and 1.0 g of stearic acid amide were uniformly mixed, and granulated by twin-screw extrusion. All the other components and operating conditions are with embodiment 1 in the prescription. The results are shown in Table 1.

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Abstract

The ultrahigh molecular weight polyethylene composition capable of being extrusion molded is prepared with ultrahigh molecular weight polyethylene in 10-30 weight portions, composite machining assistant in 1-5 weight portions, antioxidant in 0.1-1 weight portion, nucleating agent in 0.1-1 weight portion, and lubricating agent in 0.1-1 weight portion, and through mixing inside a high speed mixer at 70-90 deg.c for 2-5 min and extruding in a double screw extruder at 170-220 deg.c. The ultrahigh molecular weight polyethylene composition has improved machining performance.

Description

technical field [0001] The invention relates to an extruded ultra-high molecular weight polyethylene composition and a preparation method thereof, belonging to the field of polymer processing. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a thermoplastic with extremely high molecular weight. Since it was first developed and produced by Hoechst in West Germany in 1958, it has been put into industrial production by Hercules in the United States and Mitsui Petrochemical in Japan. Compared with many polymers, UHMWPE has a small friction factor, low wear, chemical resistance, impact resistance, frost resistance, heat preservation, self-lubrication, anti-fouling, stress crack resistance and excellent sanitation. and other characteristics. For example, the minimum coefficient of friction is 0.07-0.11, which is equivalent to the friction between ice and ice. The resulting pipe exhibits extremely high self-lubrication and anti-fouling properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K5/10B29B9/12B29C47/40C08L23/12C08K3/34
Inventor 李惠林盖景刚
Owner SICHUAN UNIV
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