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A high temperature resistant, high pressure resistant polyethylene composition

A heat-resistant polyethylene and high-pressure technology, applied in the high-pressure polyethylene composition and high-temperature field, can solve the problem of increasing the complexity and production cost of the pipe production process, low pressure resistance and physical and mechanical properties, and high pressure resistance. Low grade and other problems, to achieve the effect of saving raw materials for pipe production, good high temperature oxidation resistance, and improving heat resistance temperature

Active Publication Date: 2016-10-26
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] PE-RT pipe materials currently on the market can produce pipes with smaller diameters, and have low pressure resistance and physical and mechanical properties, which limits their use in fields with high pressure resistance and high physical and mechanical properties, such as industrial oil pipelines
Moreover, due to the low pressure rating of the pipe material, in order to meet the transportation requirements, the wall thickness of the pipe must be thicker or compounded with other materials, and more raw materials are used to prepare the pipe, which increases the complexity of the pipe production process and production costs.

Method used

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  • A high temperature resistant, high pressure resistant polyethylene composition
  • A high temperature resistant, high pressure resistant polyethylene composition
  • A high temperature resistant, high pressure resistant polyethylene composition

Examples

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Effect test

Embodiment 1～5

[0026] The preparation method of embodiment 1~5, carry out as follows:

[0027] a) Put the heat-resistant polyethylene resin, antioxidant, acid absorbing agent, and processing aid into a high-speed mixer to stir and mix, the stirring speed is 1300 rpm, the stirring time is 12min, and the stirring temperature is 38°C;

[0028] b) Add the homogeneously mixed materials into a twin-screw extruder for melting, plasticizing, extruding, and granulating. The length-to-diameter ratio of the screw is 36, and the screw combination used has 6 shear blocks, including 3 reverse shear blocks, and the processing temperature is 230°C.

Embodiment 6～10

[0031]The preparation method of embodiment 6~10, carry out as follows:

[0032] a) Put the heat-resistant polyethylene resin, antioxidant, acid absorbing agent, and processing aid into a high-speed mixer to stir and mix, the stirring speed is 1600 rpm, the stirring time is 13min, and the stirring temperature is 40°C;

[0033] b) Add the homogeneously mixed materials into a twin-screw extruder for melting, plasticizing, extruding, and granulating. The length-to-diameter ratio of the screw is 34, and the screw combination used has 5 shear blocks, including 2 reverse shear blocks, and the processing temperature is 225°C.

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Abstract

The invention relates to a high-temperature and high-pressure resistant polyethylene composition as well as a preparation method thereof, belongs to the field of high molecular materials, and mainly relates to the high-temperature and high-pressure resistant polyethylene composition as well as the preparation method thereof. The high-temperature and high-pressure resistant polyethylene composition is prepared from the following components in parts by weight: 100 parts of heat-resistant polyethylene resin, 0.3-0.55 part of an antioxidant, 0.05-0.2 part of an acid-acceptor and 0.02-0.08 part of a processing agent. The high-temperature and high-pressure resistant polyethylene composition provided by the invention has good high-temperature oxidation resistance, long-term heat resistant stable performance and higher physical mechanical strength, and has excellent long-term tube hydrostatic strength under conditions of high and low temperatures. When the prepared composition is used for producing pressure tubes in same specification, the raw materials for producing tubes can be saved by over 10%.

Description

technical field [0001] The invention discloses a high-temperature-resistant and high-pressure-resistant polyethylene composition, which belongs to the field of polymer materials, and in particular relates to a high-temperature-resistant and high-pressure-resistant polyethylene composition. Background technique [0002] Heat-resistant polyethylene (referred to as PE-RT), is a non-cross-linked polyethylene, which is synthesized by special molecular design and polymerization process, and can be used in the production of hot and cold water pipelines with heat resistance requirements, such as floor heating, Heat exchangers, solar tubes and oil pipelines, etc. [0003] At present, the polyolefin pipes used for hot and cold water pipelines mainly include cross-linked polyethylene (PEX) pipes, random copolymerized polypropylene (PPR) pipes, heat-resistant polyethylene (PE-RT for short) pipes, polybutene ( PB) pipes, etc. Among them, PE-RT pipeline system has many comprehensive per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K5/098C08K3/22C08K5/134C08K5/13C08K5/526
CPCC08K5/13C08K5/1345C08K5/526C08K2201/014C08L2201/08C08L2203/18C08L23/0815
Inventor 王群涛唐岩郭锐王日辉苑东兴许平高凌雁裴小静
Owner CHINA PETROLEUM & CHEM CORP
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