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Method for preparing polyethylene resin being easy to process and with ultra-high molecular weight

A technology of ultra-high molecular weight and polyethylene resin, applied in the field of polymer compound synthesis, can solve the problems of melt fracture, narrow molding temperature range, poor mechanical properties, etc., achieve low extrusion pressure, improve production efficiency and yield , The effect of small extruder current

Inactive Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) prone to melt fracture
(4) Narrow molding temperature range, easy to oxidize and degrade
For example, some of the currently commercially available UHMWEPE can also be used for extrusion molding, but they all have defects: good mechanical properties, poor processability, good processability and poor mechanical properties
However, the preparation method of polyethylene is still worthy of study

Method used

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  • Method for preparing polyethylene resin being easy to process and with ultra-high molecular weight
  • Method for preparing polyethylene resin being easy to process and with ultra-high molecular weight
  • Method for preparing polyethylene resin being easy to process and with ultra-high molecular weight

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0053] Add 200 liters of hexane solvent to the 300 liters of reactor, then add 2.0 grams of said supported non-metallocene catalyst CAT-1 in 200810213619.5 and cocatalyst triethylaluminum (TEAL, hexane solvent, concentration is 0.88 mol / L), start stirring, the stirring speed is 240 rpm, heat the material in the reactor to 70°C through external circulating water, and then continuously feed ethylene to maintain the total pressure of the reactor at 0.5MPa (ie polymerization pressure) for slurry polymerization. The ratio of Al to Ti is 25.

[0054] The main catalyst can also choose supported non-metallocene catalysts CAT-2, 3 and so on.

[0055] After 6 hours of polymerization, the temperature of the material in the reactor was lowered to 25° C. through external circulating water, and the pressure in the reactor was emptied to release the polymer slurry. After solid-liquid separation and drying, a powdery ethylene polymer was obtained.

[0056] The product obtained was labeled U...

Embodiment 1-2

[0064] The basic process is the same as in Example 1-1, but with the following changes:

[0065] The reaction pressure was changed to 1.0 MPa; the product obtained was labeled UHMWPE-2.

Embodiment 1-3

[0067] The basic process is the same as in Example 1-1, but with the following changes:

[0068] The reaction pressure was changed to 2.0 MPa; the product obtained was labeled UHMWPE-3.

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PUM

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Abstract

A method for preparing a polyethylene resin being easy to process and with ultra-high molecular weight prepares the resin through polymerization of vinyl monomer under conditions that a load-type non-metallocene catalyst is taken as a main catalyst for olefinic polymerization, an inertia alkane solvent is taken as a dispersing medium, an organo-aluminum compound is taken as a cocatalyst, the polymerization temperature is 60-120 DEG C, the polymerization pressure is 0.3-2 MPa, and the polymerization time is 2-16 hours. The cocatalyst, the organo-aluminum compound, is aluminoxane, alkylaluminium or both in a mixed manner. Compared with products of the same level on the market, the polyethylene resin with ultra-high molecular weight has better wear resistance, shock resistance, and processing performance. The polyethylene resin with ultra-high molecular weight is suitable for various processing modes, such as pressing sintering, extrusion moulding, injection moulding, blow moulding, etc., and especially are suitable for being used in extruding ultra-high molecular weight polyethylene pipes.

Description

Technical field: [0001] The invention belongs to the technical field of synthesis of polymer compounds, and in particular relates to a synthesis technology of ultra-high molecular weight polyethylene with good mechanical properties and processing properties. Background technique: [0002] The English name of ultra-high molecular weight polyethylene is ultra-high molecular weight polyethylene (UHMWPE for short), which refers to a linear structure polyethylene with a relative molecular weight of more than 1.5 million g / mol. Excellent wear resistance, high impact strength, excellent self-lubricating performance and low temperature resistance, which are not available, have been widely used in textile, paper, food, chemical, packaging, agriculture, construction, Medical, filter elements of filter equipment, sports, entertainment, military and other fields. [0003] However, it is precisely because of its high molecular weight that its molding process is very difficult, the main ...

Claims

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Application Information

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IPC IPC(8): C08F110/02C08F4/642
Inventor 梅利左胜武李传峰笪文忠
Owner CHINA PETROLEUM & CHEM CORP