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A kind of heat-resistant polyethylene resin composition and its application

A technology of heat-resistant polyethylene and resin composition, applied in the field of polymer materials, can solve the problems of weak pressure resistance, unstable long-term hydraulic resistance, etc., and achieve the effect of excellent long-term pressure resistance

Active Publication Date: 2018-12-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a heat-resistant polyethylene resin composition and its application to overcome the shortcomings of polyethylene resin compositions in the prior art, such as weak heat resistance, weak pressure resistance, and unstable long-term hydraulic resistance

Method used

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  • A kind of heat-resistant polyethylene resin composition and its application
  • A kind of heat-resistant polyethylene resin composition and its application
  • A kind of heat-resistant polyethylene resin composition and its application

Examples

Experimental program
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Effect test

preparation example Construction

[0031] The preparation method of heat-resistant polyethylene composition is as follows:

[0032] Put heat-resistant polyethylene resin, antioxidant, processing rheological agent, and acid absorbing agent into a high-speed mixer according to the weight ratio, stirring speed 1000-2000 rpm, stirring time 15min, stirring temperature: room temperature. Add the uniformly mixed powder into the twin-screw extruder for kneading, and set the temperature of each heating section of the extruder to 140°C, 190°C, 200°C, 200°C, 200°C, 190°C, and preheat Heat for more than 30 minutes, and wait for the temperature of each heating section of the extruder to rise to the set value. The sample to be tested is put into an extruder, melted, plasticized, extruded and granulated to prepare a heat-resistant polyethylene composition.

Embodiment 1

[0034] The heat-resistant polyethylene composition is prepared by the following method:

[0035] (1) 100 parts polyethylene resin (melt flow rate is 0.46g / 10min (190°C, 5kg), density 0.947g / cm 3 , weight average molecular weight 235000, molecular weight distribution width 20.9, melting temperature 135°C, crystallinity 64%, wafer thickness 35nm;

[0036] (2) 0.12 parts of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester;

[0037] (3) 0.05 parts of 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene;

[0038] (4) 0.10 parts of 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-s-triazine-2,4,6-(1H,3H,5H)-trione;

[0039] (5) 0.03 parts of three (2,4-di-tert-butylphenyl) phosphite;

[0040] (6) 0.05 parts of binary copolymers of vinylidene fluoride and hexafluoropropylene;

[0041] (7) 0.05 parts of calcium stearate.

[0042] The above-mentioned polyethylene resin composition was processed and performance measured, and the perform...

Embodiment 2

[0044] The heat-resistant polyethylene composition is prepared by the following method:

[0045] (1) 100 parts of polyethylene resin (melt flow rate is 0.47g / 10min (190°C, 5kg), density 0.946g / cm 3 , weight average molecular weight 214000, molecular weight distribution width 18.2, melting temperature 134°C, crystallinity 64%, wafer thickness 33nm;

[0046] (2) 0.10 parts of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester;

[0047] (3) 0.05 parts of three (2,4-di-tert-butylphenyl) phosphite;

[0048] (4) 0.15 parts of dilauryl thiodipropionate are composed;

[0049] (5) 0.01 part of a binary copolymer of vinylidene fluoride and hexafluoropropylene;

[0050] (6) 0.1 part of zinc oxide.

[0051] The above-mentioned polyethylene resin composition was processed and performance measured, and the performance parameters and the performance of the polyethylene resin composition are shown in Table 1.

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Abstract

The invention relates to a heat-resistant polyethylene resin composition and application thereof. The composition comprises the following components in parts by mass: 100 parts of heat-resistant polyethylene, 0.1 to 0.3 part of an antioxidant, 0.01 to 0.1 part of a processing auxiliary agent and 0.01 to 0.25 part of an acid removal agent, wherein the heat-resistant polyethylene is a copolymer of ethylene and 1-butene; the molecular weight of the heat-resistant polyethylene is distributed in dual modes; and the molecular weight distribution has a width (MW / MN) of 18 to 28, a weight-average molecular weight of 200 to 250 thousand, a melting temperature of 133 to 140 DEG C, a crystallinity of 63 to 65%, and a wafer thickness of 31 to 39 nm. The heat-resistant flexible polyethylene provided by the invention has excellent mechanical properties, high-temperature-resistant creep properties, heat-aging resistance and extrusion processing performance, and can be used for preparation of cool and hot water pipeline systems.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a heat-resistant, high-temperature-resistant, flexible polyethylene resin composition and its application. Background technique [0002] Heat-resistant polyethylene (PE-RT) is a non-crosslinked polyethylene produced by copolymerization of ethylene and α-olefin. By controlling the number and distribution of side chains, a unique molecular structure can be obtained to improve the heat resistance of PE. Due to the existence of short chain branches, the macromolecules of PE cannot be crystallized in a sheet crystal, but run through several crystals, forming a connection between crystals, which retains the good flexibility, high thermal conductivity and Inert, while making it better pressure resistant. Compared with metal and other plastic hot water pipes, it has outstanding advantages such as good hot-melt connection, long service life, environmental protection, high temperature res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L27/18C08L27/16C08K5/00C08K5/134C08K5/526C08K5/3492C08K5/098C08K5/13C08K5/372C08K13/02C08K3/22
CPCC08K2201/014C08L23/0815C08L2201/08C08L2203/18C08L27/18C08K5/00C08K5/1345C08K5/526C08K5/3492C08K5/098C08K5/13C08K13/02C08K5/372C08K2003/2296C08L27/16
Inventor 王立娟姜涛宋磊曹晨刚高宇新王焱鹏王斯晗何书艳姜进宪赵成才付义张瑀健任鹤赵增辉任合刚王登飞门亚男王淑英熊国辉王立文曹婷婷刘显圣崔磊杜小吉蔡小仲
Owner PETROCHINA CO LTD
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