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Polyethylene tubing resin composition

A resin composition, polyethylene pipe technology, applied in the direction of pipes, rigid pipes, pipes/pipe joints/pipes, etc., can solve the problems of destroying the ESCR performance of the resin, difficult to control the processing process, and adding a large amount of cross-linking agent. Avoid migration and precipitation problems, good environmental stress crack resistance, and improve efficiency

Active Publication Date: 2013-02-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned traditional chemical cross-linking method generally has the problem that the processing process is not easy to control, and the addition of a large amount of cross-linking agent makes the original linear molecular structure of polyethylene easily become an interpenetrating network structure, which destroys the ESCR of the resin. performance, but also makes recycling processing difficult

Method used

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  • Polyethylene tubing resin composition
  • Polyethylene tubing resin composition
  • Polyethylene tubing resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of POE-g-VA graft: According to the weight percentage of POE, mix 3.5 parts of vinyl acetate (VA) with 100 parts of POE at high speed for 6 minutes, and place the mixed material in a closed container for 10 hours ; Then get 0.03 part of BPDH and 0.3 part of acetone and put it into a beaker and mix it, then put the mixed solution and placed mixed material, 0.15 part of antioxidant 1010, and 0.15 part of calcium stearate together into a 10L high-speed mixer Medium and high speed mixing for 5 minutes; finally, add the mixed material into the Φ67 twin-screw extruder, the reaction temperature (°C) of each section of the screw is: 160, 170, 180, 190, 200, 190, 180, 175, 170 Carry out melt grafting reaction, after reacting for 7 minutes, extrude, cool and granulate to obtain POE-g-VA graft (grafting rate: 1.8%).

[0047] (2) Preparation of POE weather-resistant masterbatch: According to the weight percentage of POE, 100 parts of POE and 6 parts of POE-g-VA graf...

Embodiment 2

[0050] (1) The preparation of the POE-g-VA graft is completely the same as in Example 1.

[0051] (2) The preparation of POE weather-resistant masterbatch is completely the same as that of Example 1.

[0052] (3) Preparation of polyethylene pipe resin composition: after mixing 0.003 part of BPO and 0.06 part of TBHP with 0.2 part of acetone solvent, then add 5 parts of HDPE (6100M) granular resin, mix in 10 liters of high-speed mixer for 3 minutes, Make a premixed masterbatch; take out 12 parts of POE weather-resistant masterbatch a and premixed masterbatch, 95 parts of HDPE (6100M) resin, 0.15 parts of antioxidant B561, 0.2 parts of zinc stearate and add them to Φ67 double In the screw extruder, the reaction temperature (°C) of each section of the screw is: 170, 180, 190, 195, 200, 210, 210, 200, 190; after 3 minutes of reaction, extrusion, cooling, granulation, and preparation of polymer Vinyl pipe resin composition. The composition is made into a standard sample by inject...

Embodiment 3

[0054] (1) The preparation of the POE-g-VA graft is completely the same as in Example 1.

[0055] (2) The preparation of POE weather-resistant masterbatch is completely the same as that of Example 1.

[0056] (3) Preparation of polyethylene pipe resin composition: after mixing 0.004 part of BPO and 0.07 part of TBHP with 0.2 part of acetone solvent, then add 5 parts of HDPE (6100M) granular resin, mix in 10 liters of high-speed mixer for 3 minutes, Make a premixed masterbatch; take out 14 parts of POE weather-resistant masterbatch a, premixed masterbatch, 95 parts of HDPE (6100M) resin, 0.15 parts of antioxidant B561, and 0.2 parts of zinc stearate and add them to Φ67 double In the screw extruder, the reaction temperature (°C) of each section of the screw is: 170, 180, 190, 195, 200, 210, 210, 200, 190; after 3 minutes of reaction, extrusion, cooling, granulation, and preparation of polymer Vinyl pipe resin composition. The composition is made into a standard sample by injec...

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Abstract

The invention aims to provide a polyethylene tubing resin composition. HDPE (high-density polyethylene) is treated as a base material and is modified through the micro-crosslinking of weather-resistant POE master batches and an organic peroxide, so the tubing resin composition has an excellent ESCR (environmental stress cracking resistance) (for above 3000h). The invention further provides a preparation method of the composition. The resin composition comprises 100wt% of the HDPE, 0.05-0.2wt% of a complex crosslinking assistant and 10-30wt% of the weather-resistant POE master batches, wherein the weather-resistant POE master batches are a mixture composed of a polymer POE, a composite light stabilizing agent, a POE-g-VA graft (POE and vinyl acetate graft) and a dispersant.

Description

technical field [0001] The invention relates to a polyethylene resin composition, in particular to a resin composition for pipes with high-density polyethylene (HDPE) as the base material and excellent resistance to environmental stress cracking. Background technique [0002] In recent years, with the development of the plastics industry, polyethylene pipes have attracted more and more attention due to their light weight, corrosion resistance, low thermal conductivity, good insulation performance, convenient construction, installation and maintenance, and have become the next PVC pipe. , the world's largest consumption of plastic pipe varieties, the application areas throughout the water supply, agricultural irrigation, gas transmission, sewage, mine mortar transportation and other engineering and oil fields, chemical industry, post and telecommunications and other fields. [0003] Among polyethylene pipes, high-density polyethylene (HDPE) pipes have the characteristics of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/20C08L51/06C08K5/14C08F255/08C08J3/22F16L9/12
Inventor 徐典宏何连成丛日新朱晶白竞冰陈红翟云芳王月霞魏绪玲梁天珍
Owner PETROCHINA CO LTD
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