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Super high molecular weight polyethylene blend capable of using in extrusion processing and its processing method

A technology of ultra-high molecular weight and polyethylene, applied in the field of polymer processing, can solve the problems of low molecular weight modifiers, expensive liquid crystals, and reduced strength, and achieve the effects of low cost, improved performance, and low requirements

Inactive Publication Date: 2004-12-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of liquid crystal and the large amount (more than 10%), it is difficult to apply this technology in production
[0007] Chinese patent No. 97120157 reports a method for directly preparing polyethylene / inorganic filler composite materials in a polymerization kettle. This method synchronizes ethylene polymerization with the preparation of composite materials. The resulting product can be directly used for injection molding, but the method involves The change to the aggregation method is more difficult in actual operation
[0008] Chinese patent 9919536 has reported the processing method of extruding UHMWPE modified with decahydronaphthalene, low-molecular-weight polyethylene wax and amide lubricants, but the method uses too many low-molecular-weight modifiers, and the strength is also limited. decline, which limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] 90 grams of molecular weight is 1.5 million ultra-high molecular weight polyethylene and 10 grams of isotactic polypropylene F401 and 0.5 grams of four [β-3,5-di-tert-butyl 4-hydroxyphenylpropionic acid] pentaerythritol Ester, 1 gram of polyethylene wax, 0.5 gram of zinc stearate, and 0.3 gram of nano silicon dioxide (average particle diameter 10 nm) are mixed uniformly, and then extruded with a single screw machine. The process conditions are shown in Table 2, and the properties of the extrudate are shown in Table 3.

example 2

[0030] 80 grams of ultra-high molecular weight polyethylene with a molecular weight of 2.5 million and 20 grams of isotactic polypropylene F401 and 0.2 grams of 1,1,3-tris(2-methyl-4-hydroxyl-5-tertbutyl phenyl) butane, 0.6 gram of three (2,4-di-tert-butylphenyl) phosphite, 2 gram of polyethylene wax, 1 gram of calcium stearate, 0.5 gram of sodium benzoate, mix well, and then use a single screw extruder, and apply 200W ultrasonic vibration at the die. The process conditions are shown in Table 2, and the properties of the extrudate are shown in Table 3.

example 3

[0032] 70 grams of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million, 30 grams of isotactic polypropylene F401 and 0.8 grams of 1,1,3-tris(2-methyl-4-hydroxyl-5-tertbutyl Base phenyl) butane, 2 grams of calcium stearate, 0.5 gram of sodium benzoate mica, 0.5 gram of nano silicon dioxide (average particle diameter 10nm) are mixed uniformly, and then extruded with a single screw machine. The process conditions are shown in Table 2, and the properties of the extrudate are shown in Table 3.

[0033] Table 1 Melt flow index of UHMWPE blends

[0034] PP% 5 10 20 25

[0035] MFI (230°C, 12.16kg) 0.02 0.11 0.47 0.66

[0036] Table 2 Extrusion temperature of UHMWPE blends

[0037] Example Feeding section °C Compression section °C Homogenizing section °C Outlet °C

[0038] 1 140 200 230 210

[0039] 2 160 220 240 220

[0040] 3 190 230 250 230

[0041] Table 3 Mechanical properties of UHMWPE blend extrudates

[0042] Example Pu...

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Abstract

The invention discloses an ultra-high molecular weight polyethylene blend that can be used for extrusion processing and a processing method thereof. The method is to add a certain weight of polypropylene, antioxidant, nucleating agent and additives to the ultra-high molecular weight polyethylene , After mixing the raw materials evenly, extrude them with a single-screw machine, and apply ultrasonic vibration during the extrusion process, which can further reduce the outlet pressure and melt viscosity, and improve the extrusion efficiency. This processing method greatly improves the molding performance of ultra-high molecular weight polyethylene, and at the same time avoids the influence of low-molecular modifiers on its properties, and obtains high-performance ultra-high molecular weight polyethylene blends.

Description

1. Technical field [0001] The invention relates to an ultra-high molecular weight polyethylene blend that can be used for extrusion processing and a processing method thereof, belonging to the field of polymer processing. 2. Background technology [0002] Ultra-high molecular weight polyethylene (UHMWPE) is an engineering plastic with excellent comprehensive physical and mechanical properties. It has the incomparable wear resistance, corrosion resistance, impact resistance and low temperature resistance of ordinary polyethylene and other engineering plastics. However, due to its large molecular weight and high degree of entanglement between molecular chains, its melt viscosity is extremely high, and its melt flow index is almost zero. This makes the processing of UHMWPE extremely difficult, and cannot be processed by ordinary extrusion or injection molding methods. At present, the production of UHMWPE products is still dominated by pressing-sintering methods, and the efficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/521C08L23/06
Inventor 刘功德李惠林
Owner SICHUAN UNIV