Material special for ultrahigh-molecular-weight polyethylene tube, and preparation and application thereof

A technology of ultra-high molecular weight polyethylene pipes, which is applied in the field of polymer processing and molding, can solve the problems of not being able to meet the industrialized mass production of industrial pipes, low pipe forming efficiency, and too late to cool and solidify, and achieve dimensional stability, improved preparation process and method, the effect of fast cooling and crystallization rate

Active Publication Date: 2014-09-10
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of the UHMWPE pipe described in Chinese patent CN101486250A is extruded by a plunger extruder, and the pipe forming efficiency of this method is lower than that of a single-screw extruder
[0009] The "hard top method" single-screw extrusion molding of UHMWPE has an extrusion speed of 0.1 m / h to 2.0 m / h, which is still low in molding efficiency and cannot meet the needs of industrialized mass production of industrial pipes.
Because the "hard top method" single-screw extrusion molding is to cool the pipe parison in the mold to the crystallization temperature of the material and then extrude it, the extrusion speed is fast, the pipe parison has no time to cool and solidify, resulting in deformation of the pipe after molding

Method used

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  • Material special for ultrahigh-molecular-weight polyethylene tube, and preparation and application thereof
  • Material special for ultrahigh-molecular-weight polyethylene tube, and preparation and application thereof
  • Material special for ultrahigh-molecular-weight polyethylene tube, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Put 100 parts by weight of ultra-high molecular weight polyethylene with a viscosity average molecular weight of 2.5 million, 40 parts of metallocene low-density polyethylene, 5 parts of chlorinated paraffin, and 1 part of p-hydroxybenzoic acid in a mixer and mix them for 60 minutes. , and then put the mixture into a single-screw extruder for extrusion, the extrusion speed is 2.5 m / h, the outer diameter of the pipe is 1200 mm, the wall thickness of the pipe is 40 mm, and the extrusion melt temperature of the pipe is 280 ° C.

[0035] The performance indicators of the pipes are shown in Table 1.

Embodiment 2

[0037] Put 100 parts by weight of ultra-high molecular weight polyethylene with a viscosity average molecular weight of 1.5 million, 0.5 parts of metallocene ultra-low density polyethylene, 2 parts of polyethylene wax, 2 parts of paraffin wax, and 0.1 part of calcium carbonate in a mixer for mixing. For 1 minute, then the mixture is put into a single-screw extruder to extrude, the extrusion speed is 3.0 m / hour, the outer diameter of the pipe is 630 mm, the wall thickness of the pipe is 10 mm, and the extrusion melt temperature of the pipe is 220°C.

[0038] The performance indicators of the pipes are shown in Table 1.

Embodiment 3

[0040] By weight, 100 parts of ultra-high molecular weight polyethylene with a viscosity average molecular weight of 3.5 million, 5 parts of metallocene low-density polyethylene, 5 parts of metallocene high-density polyethylene, 2 parts of polyethylene wax, 0.1 part of paraffin, 0.5 part of stearic acid Calcium and 1 part of talcum powder are placed in a mixer and mixed for 10 minutes, then the mixture is put into a single-screw extruder and extruded at a speed of 3.5 m / h, and the outer diameter of the pipe is 250 mm. The wall thickness of the pipe is 10 mm, and the extrusion melt temperature of the pipe is 250 °C.

[0041] The performance indicators of the pipes are shown in Table 1.

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Abstract

The invention relates to a material special for an ultrahigh-molecular-weight polyethylene tube subjected to rapid extrusion molding, and preparation and application of the material, and the material is specially used for the extrusion-molded tube. The extrusion-molded tube has the following characteristics: (1) the extrusion speed of the tube is 2.5 m / h-6.0 m / h; (2) the external diameter of the tube is 10 mm-1200 mm; (3) the wall thickness of the tube is 2 mm-100 mm; (4) the extrusion melt temperature of the tube is 150 DEG C-280 DEG C; and (5) the viscosity average molecular weight of the tube is 1.5 millions-7 millions. Compared with the prior art, the production efficiency of the ultrahigh-molecular-weight polyethylene tube is improved by 0.5-3 times, and also the tube possesses excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of polymer processing and molding, and relates to a special material for rapid extrusion molding of ultra-high molecular weight polyethylene pipes. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is polyethylene (PE) with a viscosity average molecular weight greater than 1.5 million. It is a new type of thermoplastic engineering plastic. Its extremely high molecular weight and highly entangled segment structure endow it with excellent mechanical properties, Impact, wear resistance, self-lubrication, chemical corrosion resistance and other properties. Moreover, UHMWPE has excellent low temperature resistance, and still has high impact strength at -40°C, and can even be used at -269°C. The excellent performance of UHMWPE makes it widely used in the fields of machinery, textile, papermaking, mining, chemical industry and sports equipment, among which large packaging containers a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08L23/00C08L25/06C08K3/26C08K3/34C08K5/098C08K3/36C08K3/38
CPCB29C48/92B29C2948/9258B29C2948/92704C08K2201/014C08L23/06C08L2203/18C08L2205/025C08L2205/03C08L2205/035C08L2205/24C08L2207/062C08L2207/064C08L2207/066C08L2207/068C08L91/06C08K5/13C08K2003/265C08K5/09C08K3/34C08L23/0815C08K5/098C08L23/00C08L23/12C08K3/36C08L25/06C08K5/053C08K2003/262C08K13/02C08K2003/385
Inventor 张炜冯玲英叶纯麟洪尉夏晋程
Owner SHANGHAI RES INST OF CHEM IND
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