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Method for extruding and molding bimodal polyethylene product

A bimodal polyethylene extrusion molding technology, which is applied in the field of extrusion molding of high-strength branched bimodal polyethylene products, can solve the problems of insufficient mechanical properties of bimodal polyethylene products, so as to promote formation and increase stability Effect

Active Publication Date: 2018-12-11
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for extrusion molding of high-strength bimodal polyethylene products in order to solve the problem of insufficient mechanical properties of existing bimodal polyethylene products

Method used

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  • Method for extruding and molding bimodal polyethylene product
  • Method for extruding and molding bimodal polyethylene product
  • Method for extruding and molding bimodal polyethylene product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 1000g of bimodal polyethylene with a weight average molecular weight of 210000 and a molecular weight distribution of 24, 1250mg of antioxidant 1010, and 1000mg of lubricant into a single-screw extruder to obtain bimodal polyethylene products, wherein the bimodal polyethylene is high The mass content of the molecular weight part is 10%, the weight average molecular weight is 820,000, and the molecular weight distribution is 3. The high molecular weight part contains 60 ethyl branched chains for every 10,000 carbon atoms; the mass content of the low molecular weight part of bimodal polyethylene is 90%. The average molecular weight is 170,000, and the molecular weight distribution is 4; the temperature of the feed section of the extruder is 120°C, the temperature of the compression section is 165°C, the temperature of the homogenization section is 160°C, and the temperature of the die is 160°C. The section is conical, the speed of the material passing through the die i...

Embodiment 2

[0035] Add 1,000g of bimodal polyethylene with a weight average molecular weight of 350,000 and a molecular weight distribution of 35, 800mg of antioxidant 1076, and 600mg of flame retardant into a single-screw extruder to obtain bimodal polyethylene products, wherein bimodal polyethylene The mass content of the high molecular weight part is 30%, the weight average molecular weight is 1,000,000, and the molecular weight distribution is 5. The high molecular weight part contains 30 butyl branches per 10,000 carbon atoms; the mass content of the bimodal polyethylene low molecular weight part is 70%, The weight-average molecular weight is 60,000, and the molecular weight distribution is 5; the temperature of the feed section of the extruder is 130°C, the temperature of the compression section is 180°C, the temperature of the homogenization section is 180°C, and the temperature of the die is 200°C. The flow section is conical, the speed of the material passing through the die is 30...

Embodiment 3

[0037] Add 1,000g of bimodal polyethylene with a weight average molecular weight of 500,000 and a molecular weight distribution of 47 and 900mg of antioxidant 168 into a single-screw extruder and extrude to obtain a bimodal polyethylene product, wherein the high molecular weight part of bimodal polyethylene has a mass content of The weight average molecular weight is 1,200,000, the molecular weight distribution is 7, and the high molecular weight part contains 20 hexyl branched chains per 10,000 carbon atoms; the mass content of the bimodal polyethylene low molecular weight part is 58%, and the weight average molecular weight is 20,000, The molecular weight distribution is 8; the temperature of the feed section of the extruder is 140°C, the temperature of the compression section is 218°C, the temperature of the homogenization section is 216°C, and the temperature of the die is 220°C, and the diversion section of the extruder is a semi-single lobe Hyperboloid shape, the speed of...

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Abstract

The invention relates to a method for extruding and molding a bimodal polyethylene product. According to the method, bimodal polyethylene with specific molecular weight is selected, the answer time ofan extended chain in melt processing can be increased by utilizing proper branching of partial molecular chain with high molecular weight in the bimodal polyethylene, and formation of shish-kebab crystal is promoted by regulating the process parameter in the processing process, especially quickly cooling after passing through a mouth model, so that the mechanical performance of the bimodal polyethylene extruded product can be effectively promoted. The method is a method for efficiently preparing bimodal polyethylene products and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of bimodal polyethylene products, in particular to an extrusion molding method for high-strength branched bimodal polyethylene products. Background technique [0002] Polyethylene is one of the five general-purpose plastics. It has the characteristics of non-toxic, low-cost, light weight, excellent moisture resistance, good chemical stability and easy molding and processing. It has a very wide range of uses in various fields of daily life. However, due to the insufficient mechanical strength of polyethylene products, its application in engineering fields is severely limited. Bimodal polyethylene refers to a polyethylene resin whose molecular weight distribution curve presents two peaks. The high molecular weight part and low molecular weight part of bimodal polyethylene are uniformly mixed at the molecular level. Therefore, compared with ordinary polyethylene, bimodal polyethylene At the same time, it has excellent p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/92C08L23/06B29C48/92
CPCC08L23/06C08L2205/025
Inventor 王宗宝别大奎段天臣
Owner NINGBO UNIV
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