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Method for preparing extrusion-grade ultrahigh molecular weight polyethylene-high density polyethylene-attapulgite pregel composite material

A high-density polyethylene and ultra-high molecular weight technology, applied in the field of polymer processing, can solve the problems of increased difficulty in mixing evenly composite systems, decreased performance of ultra-high molecular weight polyethylene, and decreased toughness of ultra-high molecular weight polyethylene. Effects of increased critical shear rate, reduced melt viscosity, and improved flow properties

Inactive Publication Date: 2011-03-16
HUAFENG PIPE IND CO LTD GANSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent 98100960.3 selects the main chain polyester liquid crystal polymer to modify the ultra-high molecular weight, which greatly improves the fluidity of ultra-high molecular weight polyethylene, and prepares a special ultra-high molecular weight polyethylene that can be used for extrusion and injection. However, due to the high price of liquid crystal polymers, its application and promotion in industry are severely limited.
[0004] U.S. Patent US4853427 and Japanese Patent JP6042078 blend and modify ultra-high molecular weight polyethylene and medium and low molecular weight polyethylene. Although the fluidity of the mixture is improved, it can only be used when the amount of medium and low molecular weight polyethylene is more than 30 parts. used in extrusion and injection molding, which makes the performance of ultra-high molecular weight polyethylene drop significantly
[0005] Chinese patent 01100116.3 reports the technology of organoclay modified ultra-high molecular weight polyethylene. It mixes the layered silicate of montmorillonite with ultra-high molecular weight polyethylene through in-situ graft intercalation to obtain extrusion injection grade ultra-high molecular weight polyethylene. High-molecular-weight polyethylene special material, but while the fluidity is improved, with the increase of layered silicate, the good toughness of ultra-high-weight polyethylene decreases significantly
However, polypropylene and ultra-high molecular weight polyethylene are typical incompatible systems, which makes it more difficult to mix the composite system evenly, and has higher requirements for processing machinery, requiring equipment modification of the extruder

Method used

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  • Method for preparing extrusion-grade ultrahigh molecular weight polyethylene-high density polyethylene-attapulgite pregel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: At room temperature, attapulgite clay and xylene were added to a high-speed stirrer according to a weight ratio of 1:1, and stirred at a high speed for 10 minutes to obtain an attapulgite pregel; 5 million ultra-high molecular weight polyethylene, 10 parts of high-density polyethylene with an average molecular weight of 40,000-300,000, 3 parts of attapulgite pregel, 20 parts of fly ash glass beads, 0.3 parts of antioxidant Agent 1010 was stirred in a high-speed mixer at room temperature for 10 minutes at high speed, extruded and granulated on a general-purpose twin-screw extruder, and the extrusion temperature was 180-240°C. The test results are shown in Table 1.

Embodiment 2

[0029] Example 2: At room temperature, attapulgite clay and acetone were added to a high-speed mixer according to a weight ratio of 1:1, and stirred at a high speed for 10 minutes to obtain an attapulgite pregel; the average molecular weight of 85 parts was 100-500 10,000 ultra-high molecular weight polyethylene, 15 parts of high-density polyethylene with an average molecular weight of 4-300,000, 6 parts of attapulgite pregel, 10 parts of fly ash glass beads, 10 parts of liquid paraffin, 0.3 A part of antioxidant 1010 was stirred in a high-speed mixer at room temperature for 10 minutes at high speed, extruded and granulated on a general-purpose twin-screw extruder, and the extrusion temperature was 180-240°C. The test results are shown in Table 1.

Embodiment 3

[0030] Example 3: at room temperature, attapulgite clay and 120# solvent oil were added in a high-speed mixer according to a weight ratio of 1:1, and stirred at a high speed for 10 minutes to prepare attapulgite pre-gel; the average molecular weight of 85 parts was 1-5 million ultra-high molecular weight polyethylene, 15 parts of high-density polyethylene with an average molecular weight of 4-300,000, 3 parts of attapulgite pregel, 20 parts of fly ash glass beads, 0.3 parts of Antioxidant 1010 was stirred in a high-speed mixer at room temperature for 10 minutes at high speed, extruded and granulated on a general-purpose twin-screw extruder, and the extrusion temperature was 180-240°C. The test results are shown in Table 1.

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Abstract

The invention discloses a method for preparing an extrusion-grade ultrahigh molecular weight polyethylene-high density polyethylene-attapulgite pregel composite material. The method comprises the following steps: adding 15-10 parts by weight of high density polyethylene, 1-10 parts by weight of attapulgite pregel, 0.5-30 parts by weight of flow modifier and 0.1-1 part by weight of antioxygen into 85-90 parts by weight of ultrahigh molecular weight polyethylene, mixing at the temperature of 20-30 DEG C at a high speed, feeding the mixture in a double-screw extruder at the extrusion temperature of 180-240 DEGC, and extruding and pelletizing to obtain the extrusion-grade ultrahigh molecular weight polyethylene special material which has the characteristic of excellent mechanical performance, and can meet requirements of certain occasions and special products.

Description

technical field [0001] The invention relates to a preparation method of extrusion-grade ultra-high molecular weight polyethylene / high-density polyethylene / attapulgite pregel composite material, belonging to the field of polymer processing. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) has strong impact resistance (the impact resistance ranks first among plastics), good corrosion resistance, excellent chemical resistance, low density, low coefficient of friction, excellent mold release performance, and extremely low Water absorption, excellent electrical insulation and antistatic properties, moderate mechanical strength, rigid creep resistance, excellent machining properties, self-lubricating properties, anti-fouling properties, good resistance to high-energy radiation properties, are Known as "amazing plastic", its comprehensive performance exceeds that of "plastic king" PTFE. These excellent properties make ultra-high molecular weight poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K9/00C08K3/34C08K7/20
Inventor 陆廷华谷正
Owner HUAFENG PIPE IND CO LTD GANSU
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