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Easy-to-form heat-resistant polyethylene composition

A technology of heat-resistant polyethylene and composition, which is applied in the field of easy-to-form heat-resistant polyethylene composition, can solve the problems of unstable performance of the prepared composition, complicated components and preparation process, high cost of nucleating agent, etc., and achieve good resistance High pressure performance, high flexibility, and the effect of reducing production costs

Active Publication Date: 2019-01-01
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is formed by blending various components, and the components and preparation process are complicated. At the same time, the cost of the nucleating agent is high and it is not easy to disperse, and the performance of the prepared composition is unstable.

Method used

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  • Easy-to-form heat-resistant polyethylene composition
  • Easy-to-form heat-resistant polyethylene composition
  • Easy-to-form heat-resistant polyethylene composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0024] Table 1 shows the proportioning components of the polyethylene resin composition used in hot water pipes in Examples 1-5.

[0025] Table 1 The polyethylene resin composition table of embodiment 1-5 hot water pipeline (by weight)

[0026]

[0027]

[0028] "-" in the table means not added.

[0029] The preparation method of embodiment 1-5 is:

[0030] a) Put the polyethylene resin, antioxidant and processing aid into a high-speed mixer and mix them with a stirring speed of 1200 rpm, a stirring time of 10 minutes, and a stirring temperature lower than 40°C;

[0031] b) Add the homogeneously mixed materials into a twin-screw extruder for melting, plasticizing, extruding, and granulating. The screw length-to-diameter ratio is 35:1, and the processing temperature is 220°C.

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Abstract

The invention belongs to the field of polymer materials and relates to an easily forming heat-resistant polyethylene composition. The composition is prepared from 100 parts by weight of polyethylene resin, 0.2 to 0.5 parts by weight of an antioxidant and 0.04 to 0.06 parts by weight of processing aids. The polyethylene resin contains 7.3-9.0% of lamellar crystals with thickness less than 6.1nm and 64.0-68.0% of lamellar crystals with thickness greater than 13.3nm and a ratio of two types of the lamellar crystals with different thickness is represented by x / y and is greater than 6.5 and less than 9.5. The polyethylene composition has good pressure resistance, flexibility, a high crystallization temperature and a high crystallization rate, can be used for production of an underfloor heating pipe and a solar pipe, is conducive to ensuring of the performances and a service life of the pipe, improves product production efficiency and reduces a production cost.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an easy-to-form heat-resistant polyethylene composition. Background technique [0002] Polyethylene of raised temperature resistance (PE-RT) pipe material is the latest generation of special plastic for heat-resistant pipes and geothermal pipes. Polyethylene plastics can be used in the production of cold and hot water pipelines with heat resistance requirements, such as floor heating, heat exchangers, solar tubes and oil pipelines. [0003] The production speed of heat-resistant polyethylene pipe material is high, and the pulling speed can reach up to 40m / min. It is required that the pipe material has good processing performance, and it must meet the needs of rapid prototyping in the rapid processing process, so as to prevent the pipe material from cooling when it is not completely cooled. Deformation will affect the later use and life of the pipe. The crystallizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K5/134C08K5/526C08K5/13
CPCC08K2201/014C08L23/0815C08L2201/08C08L2203/18C08L27/12C08K5/13C08K5/526C08K5/1345
Inventor 王群涛郭锐高凌雁王日辉许平唐岩苑东兴王秀丽石晶
Owner CHINA PETROLEUM & CHEM CORP
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