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Method for producing super high molecular weight polyvinyl products by screw extruder

An ultra-high molecular weight, screw extruder technology, applied in the polymer field, can solve the problems of long operation time, high production cost, small friction coefficient, etc., and achieve the effect of uniform material distribution, reduced production cost and increased plasticization process

Inactive Publication Date: 2002-11-06
王明荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the relatively high melting temperature and poor fluidity of ultra-high molecular weight polyethylene, the material is in a high viscoelastic state after heating and melting, and its fluidity is almost zero. In addition, its friction coefficient is small and its critical shear rate is low. Features, the existing plastic processing technology and extrusion equipment, it is difficult to produce industrial products, let alone form industrialized continuous production
[0004] For a long time, ultra-high molecular weight polyethylene has usually been sintered and pressed: according to the cavity of the required product, the mold is processed and pressed, and powdered ultra-high molecular weight polyethylene is loaded into the mold, and the material in the mold is melted by electric heating. After that, it is pressed by a flat vulcanizing machine, which takes a long time to operate, high production cost and low production efficiency
Some relevant units in China have tried to use single-screw extruders to produce ultra-high molecular weight polyethylene products, but failed due to technical reasons; it is understood that more than 90% of foreign manufacturers are still using traditional sintering and pressing methods. produce this product

Method used

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  • Method for producing super high molecular weight polyvinyl products by screw extruder
  • Method for producing super high molecular weight polyvinyl products by screw extruder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] a. Raw material pretreatment, using a high-speed mixer to stir the ultra-high molecular weight polyethylene, so that the powdery raw materials will generate heat due to friction, and remove the moisture in the raw materials.

[0026] b. Add additives, add modifying additive liquid crystal polymer LCP to the raw material ultra-high molecular weight polyethylene to form a mixture, wherein the ultra-high molecular weight polyethylene is 95%, and the liquid crystal polymer LCP is 5%;

[0027] c, feeding, adding the above mixture into the feeding port of the twin-screw extruder;

[0028] d. Melting and plasticizing, using a twin-screw extruder to melt and modify the above mixture. The aspect ratio of the twin-screw is 27. The axes of the two screws are approximately parallel and rotate in the same direction. The temperature of the barrel is set to 4 sections. Stage 1: 115°C, Stage 2: 180°C, Stage 3: 260°C, Stage 4: 260°C;

[0029] e. Extrude, put the above-mentioned molten ...

Embodiment 2

[0033] a. Raw material pretreatment, using a high-speed mixer to stir the ultra-high molecular weight polyethylene, so that the powdery raw materials will generate heat due to friction, and remove the moisture in the raw materials.

[0034] b. Add additives, add modifying additive liquid crystal polymer LCP to the raw material ultra-high molecular weight polyethylene to form a mixture, wherein the ultra-high molecular weight polyethylene is 85%, and the liquid crystal polymer LCP is 15%, the unit is percentage by weight;

[0035] c, feeding, adding the above mixture into the feeding port of the twin-screw extruder;

[0036] d. Melting and plasticizing, using a twin-screw extruder to melt and modify the above mixture. The twin-screw length-to-diameter ratio is 23. The axes of the two screws are approximately parallel and rotate in the same direction. The temperature of the barrel is set to 4 sections. Stage 1: 80°C, Stage 2: 130°C, Stage 3: 220°C, Stage 4: 220°C;

[0037] e. E...

Embodiment 3

[0041] a. Raw material pretreatment, using a high-speed mixer to stir the ultra-high molecular weight polyethylene, so that the powdery raw materials will generate heat due to friction, and remove the moisture in the raw materials.

[0042] b. Add additives, add modifying additive liquid crystal polymer LCP to the raw material ultra-high molecular weight polyethylene to form a mixture, wherein the ultra-high molecular weight polyethylene is 90%, and the liquid crystal polymer LCP is 10%, the unit is percentage by weight;

[0043] c, feeding, adding the above mixture into the feeding port of the twin-screw extruder;

[0044] d. Melting and plasticizing, using a twin-screw extruder to melt and modify the above mixture. The twin-screw length-to-diameter ratio is 25. The axes of the two screws are approximately parallel and rotate in the same direction. The temperature of the barrel is set to 4 sections. Stage 1: 95°C, Stage 2: 155°C, Stage 3: 240°C, Stage 4: 240°C;

[0045] e. Ext...

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Abstract

The process of producing superhigh molecular weight polyethylene product includes the steps of: material pre-treatment; adding LCP as modifying assistant into superhigh molecular weight polyethylene;feeding the mixture material into feeding port of the double screw extruder; smelting and denaturing the mixture material inside the double screw extruder; and extruding through the double screw extruder and one single screw extruder connected serially to the double screw extruder. The said production process has low production cost and high production efficiency and it is suitable for mass industrial production.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a method for producing ultra-high molecular weight polyethylene products using a screw extruder. Background technique [0002] Ultra-high molecular weight polyethylene (UHMW-PE) refers to a linear structure polyethylene with a molecular weight of more than 1.5 million. Due to its high molecular weight, strong wear resistance, impact resistance, corrosion resistance, low temperature resistance, good self-lubricating performance and anti-fouling performance, it is a new type of engineering plastic with excellent performance, which can replace stainless steel, Materials such as high manganese steel and wear-resistant cast steel have broad market prospects. [0003] However, due to the relatively high melting temperature and poor fluidity of ultra-high molecular weight polyethylene, the material is in a high viscoelastic state after heating and melting, and its fluidity is al...

Claims

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Application Information

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IPC IPC(8): B29B9/06C09K19/38
Inventor 王明荣
Owner 王明荣
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