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High-barrier, low-temperature-resistant and environmental stress cracking-resistant HDPE (high-density polyethylene) material as well as preparation method and application thereof

A technology of environmental stress resistance and low temperature resistance, which is applied in the field of modified plastics, can solve the problems that HDPE material barrier performance, low temperature resistance and environmental stress cracking resistance cannot be improved at the same time, and achieve significant environmental stress cracking resistance and good low temperature Toughness, the effect of improving barrier properties

Active Publication Date: 2022-07-22
TIANJIN KINGFA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to overcome the defect that the barrier performance, low temperature resistance and environmental stress cracking resistance of HDPE materials in the prior art cannot be improved simultaneously, and provide a HDPE material with high barrier, low temperature resistance and excellent environmental stress cracking resistance

Method used

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  • High-barrier, low-temperature-resistant and environmental stress cracking-resistant HDPE (high-density polyethylene) material as well as preparation method and application thereof
  • High-barrier, low-temperature-resistant and environmental stress cracking-resistant HDPE (high-density polyethylene) material as well as preparation method and application thereof
  • High-barrier, low-temperature-resistant and environmental stress cracking-resistant HDPE (high-density polyethylene) material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～16

[0074] This example provides a series of HDPE materials with high barrier, low temperature resistance and environmental stress crack resistance, which are prepared according to the formulas in Tables 1-2 and according to the preparation method including the following steps:

[0075] Add HDPE, hyperbranched polyacrylate oligomer, PB, HDPE-g-MAH, POE and other additives into a high-speed mixer and mix for 5 minutes. Then join in the twin-screw extruder (screw length-diameter ratio is 48:1), at 170~210 ℃ (the first zone temperature 170~180 ℃, the second zone temperature 190~200 ℃, the third zone temperature 190~200 ℃, The temperature of the fourth zone is 190~200℃, the temperature of the fifth zone is 190~200℃, the temperature of the sixth zone is 190~205℃, the temperature of the seventh zone is 190~205℃, the temperature of the eight zone is 200~210℃, and the temperature of the nine zone is 200~210℃), 250 Melted, extruded and pelletized (underwater pelletizing) at ~300 rpm.

[0...

Embodiment 3

[0102] The results of Example 3, Examples 9 to 12, and Comparative Examples 3 and 4 show that for hyperbranched polyacrylate oligomers, the molecular weight is too low (Comparative Example 3) to improve the environmental stress cracking resistance of the material; High (Comparative Example 4), the viscosity of the hyperbranched polyacrylate oligomer is too high, and the compatibility with HDPE is poor. During long-term use, it is easier to crack, and the material has remarkable environmental stress crack resistance and low temperature toughness. decline. Only suitable molecular weight hyperbranched polyacrylate oligomers can improve the environmental stress cracking resistance of materials.

[0103] The results of Example 3 and Examples 13 to 16 show that conventional commercially available POEs can be used in the present invention. The comparison of Example 3 and Example 13 shows that, within a certain range, the melt flow rate in POE has a significant effect on the prepared ...

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Abstract

The invention provides a high-barrier, low-temperature-resistant and environmental stress cracking-resistant HDPE (high-density polyethylene) material as well as a preparation method and application thereof. The HDPE material provided by the invention comprises the following components in parts by weight: 35 to 70 parts of HDPE, 5 to 10 parts of hyperbranched polyacrylate oligomer, 10 to 20 parts of PB, 10 to 20 parts of HDPE-g-MAH, 5 to 10 parts of POE and 0 to 2 parts of other auxiliary agents, and the number-average molecular weight of the hyperbranched polyacrylate oligomer is 1000 to 9000. The cracking time of the prepared material under the conditions of 70 DEG C and internal air pressure of 5MPa is 2000h or more; the transmittance of propane gas is lt; 0.1%; at the temperature of-40 DEG C, the notch impact strength of the material is 15 kJ / m < 2 > or above and can reach 16.4 kJ / m < 2 >, and the material can be used for preparing liquefied gas bottles and other products with the requirement for high airtightness.

Description

technical field [0001] The invention belongs to the technical field of modified plastics, and in particular relates to an HDPE material with high barrier, low temperature resistance and environmental stress crack resistance, and a preparation method and application thereof. Background technique [0002] The traditional liquefied gas cylinders are mainly steel cylinders, but the steel cylinders have the disadvantages of heavy weight, difficult processing, high cost, and the steel cylinders are conductive, so it is impossible to add positioning and stress sensing systems to the steel cylinders, unable to form the Internet of Things, and unable to track the user's liquefied gas in real time. usage. [0003] Due to its light weight, electrical insulation, convenient processing and molding, and low price, HDPE has been selected as the material for a new generation of liquefied gas cylinders by replacing steel with plastic. However, the traditional HDPE resin has poor resistance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/20C08L51/06C08L23/08
CPCC08L23/06C08L2207/062C08L23/20C08L51/06C08L23/0815
Inventor 崔嵬郝垠龙陆湛泉杨霄云陶四平
Owner TIANJIN KINGFA NEW MATERIAL
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