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A kind of polyethylene resin composition for pipe material

A technology of polyethylene resin and resin composition, applied in the field of resin composition for pipes, can solve the problems of inability to price and grade, limit the scope of use, complicated technology, etc., and achieve improved compatibility, improved dispersion effect, and low density. Effect

Active Publication Date: 2014-10-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ESCR of PE63 grade resin is less than 1000 hours, so the scope of use is limited, and the price and grade cannot compete with PE80 and PE100 grade resin for pipes
The ESCR of PE80, PE100 or higher polyethylene pipe resins exceeds 1000 hours, but the resin is directly obtained from the polymerization reaction, which is complicated in technology and high in cost.

Method used

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  • A kind of polyethylene resin composition for pipe material
  • A kind of polyethylene resin composition for pipe material
  • A kind of polyethylene resin composition for pipe material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of ULDPE-g-VA graft: According to the weight percentage of ULDPE, 7 parts of vinyl acetate (VA) and 100 parts of ULDPE (4703G) were mixed at high speed for 7 minutes, and the mixed materials were placed in an airtight container Place in the middle for 10hr; then take 0.03 parts of DCP and 0.3 parts of acetone and mix them in a beaker, then put the mixed solution and the placed mixed material, 0.15 parts of antioxidant 1010, and 0.15 parts of calcium stearate into 10L In the high-speed mixer, mix at high speed for 5 minutes; finally, add the mixed material into the Φ67 twin-screw extruder, and 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 ULDPE-g-VA graft (grafting rate: 3.1%).

[0045] (2) Preparation of ULDPE weather-resistant masterbatch: according to the weight percentage of ULDPE, 100 par...

Embodiment 2

[0048] (1) The preparation of the ULDPE-g-VA graft is completely the same as in Example 1.

[0049] (2) The preparation of ULDPE weather-resistant masterbatch is completely identical with embodiment 1.

[0050] (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 16 parts of ULDPE 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 (℃) of each section of the screw is: 160, 170, 180, 190, 200, 210, 220, 200, 190; Vinyl pipe resin composition. The composition is made into a standard sample by injection method, and the tested properties are shown in Table 1.

Embodiment 3

[0052] (1) The preparation of the ULDPE-g-VA graft is completely the same as in Example 1.

[0053] (2) The preparation of ULDPE weather-resistant masterbatch is completely identical with embodiment 1.

[0054] (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 20 parts of ULDPE 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 (℃) of each section of the screw is: 160, 170, 180, 190, 200, 210, 220, 200, 190; Vinyl pipe resin composition. The composition is made into a standard sample by injection method, and the tested properties are shown in Table 1.

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Abstract

A purpose of the present invention is to provide a polyethylene resin composition for pipes, wherein a HDPE resin is adopted as a base material, and micro cross-linking modification of ultra-low density polyethylene (ULDPE) weathering resistance master batch and an organic peroxide is adopted to achieve the purpose. The resin composition has an excellent ESCR performance (more than 3000 hours). The resin composition comprises, by weight of high density polyethylene (HDPE), 100% of HDPE 100, 0.05-0.2% of a compound cross-linking aid, and 10-35% of ULDPE weathering resistance master batch, wherein the ULDPE weathering resistance master batch is a blend comprising ULDPE, a composite light stabilizer, a ULDPE-g-VA graft and a dispersing agent, and the ULDPE-g-VA graft is a graft of ULDPE and vinyl acetate. The present invention further provides a preparation method for the resin composition.

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 Patents(China)
IPC IPC(8): C08L23/06C08L23/08C08L51/06C08K5/14C08F255/02C08J3/22B29B9/06B29C47/92B29C48/92
CPCB29C47/92
Inventor 徐典宏赵燕曹凤霞李慧文郭珺李耀翟云芳王月霞魏绪玲梁天珍
Owner PETROCHINA CO LTD
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