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Polyethylene composition used for geomembrane

A technology of polyethylene and composition, which is applied in the field of polyethylene composition for geomembrane, which can solve the problems of product quality and safety hazards, stress cracking of geomembrane, and the failure of normal batch production by downstream production enterprises, and achieve excellent stress cracking resistance. And anti-aging performance, the effect of meeting the requirements of production and use

Inactive Publication Date: 2019-04-05
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the grades of polyethylene geomembrane raw materials currently available on the market are less, and the performance is not stable enough, and some properties such as stress cracking resistance and aging resistance are not good, resulting in stress cracking and aging of the geomembrane produced in a short period of time. , which brings great hidden dangers to the quality and safety of the final product, and also causes downstream production enterprises to fail to produce in batches normally

Method used

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  • Polyethylene composition used for geomembrane
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  • Polyethylene composition used for geomembrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The proportion of polyethylene composition for geomembrane is as follows:

[0024] High-density polyethylene resin 70 (parts by mass, the same below)

[0025] Linear Low Density Polyethylene Resin 30

[0026] additive:

[0027]

[0028]

[0029] Among them, the density of high-density polyethylene resin is 0.949g / cm 3 , a melt flow rate of 0.4 g / 10 min (190° C., 5.0 kg weight). The density of linear low density polyethylene resin is 0.914g / cm 3 , a melt flow rate of 3.0 g / 10 min (190° C., 2.16 kg weight).

[0030] Specific preparation method: After mixing high-density polyethylene resin, linear low-density polyethylene resin and additives in a high-speed mixer for 5 minutes, the uniformly mixed material is added to a twin-screw extruder for melting, plasticization, extrusion, The composition is obtained after granulation and drying. Wherein, the aspect ratio of the screw of the twin-screw extruder is 25, the diameter of the screw is 35mm, and the processing ...

Embodiment 2

[0033] The proportion of polyethylene composition for geomembrane is as follows:

[0034] High-density polyethylene resin 80 (parts by mass, the same below)

[0035] Linear Low Density Polyethylene Resin 20

[0036] additive:

[0037]

[0038] Among them, the density of high-density polyethylene resin is 0.948g / cm 3 , a melt flow rate of 0.3 g / 10 min (190° C., 5.0 kg weight). The density of linear low density polyethylene resin is 0.918g / cm 3 , a melt flow rate of 2.0 g / 10 min (190° C., 2.16 kg weight).

[0039] Specific preparation method: After mixing high-density polyethylene resin, linear low-density polyethylene resin and additives in a high-speed mixer for 5 minutes, the uniformly mixed material is added to a twin-screw extruder for melting, plasticization, extrusion, The composition is obtained after granulation and drying. Wherein, the aspect ratio of the screw of the twin-screw extruder is 33, the diameter of the screw is 45mm, and the processing temperature ...

Embodiment 3

[0042] The proportion of polyethylene composition for geomembrane is as follows:

[0043] High-density polyethylene resin 90 (parts by mass, the same below)

[0044] Linear Low Density Polyethylene Resin 10

[0045] additive:

[0046]

[0047] Among them, the density of high-density polyethylene resin is 0.952g / cm 3 , the melt flow rate is 0.2g / 10min (190°C, 5.0kg weight). The density of linear low density polyethylene resin is 0.922g / cm 3 , a melt flow rate of 1.0 g / 10 min (190° C., 2.16 kg weight).

[0048] Specific preparation method: After mixing high-density polyethylene resin, linear low-density polyethylene resin and additives in a high-speed mixer for 5 minutes, the uniformly mixed material is added to a twin-screw extruder for melting, plasticization, extrusion, The composition is obtained after granulation and drying. Wherein, the aspect ratio of the screw of the twin-screw extruder is 30, the diameter of the screw is 35mm, and the processing temperature is ...

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Abstract

The invention discloses a polyethylene composition used for a geomembrane. The composition includes, by mass, the following components: 70-90 parts of high-density polyethylene resin, 10-30 parts of linear low-density polyethylene resin, 0.1-0.4 part of a main antioxidant, 0.1-0.4 part of an auxiliary antioxidant, and 0.1-0.2 part of a lubricant. The polyethylene composition used for the geomembrane of the invention has excellent performance of stress cracking resistance and aging resistance, stress cracking under tensile load (NCTL) time is more than 2000 h, the oxidation induction time is more than 100 minutes, and production and use requirements of downstream users can be satisfied well.

Description

technical field [0001] The invention belongs to the field of polymer material science and technology, in particular to a polyethylene composition for geomembrane. Background technique [0002] Geomembrane is a membrane-like material with extremely low permeability used in civil engineering for waterproofing. Its water vapor permeability coefficient is less than 1×10-13g cm / (cm 2 s Pa), compared with traditional waterproof materials, geomembrane has the advantages of low permeability coefficient, good low temperature flexibility, strong deformation adaptability, light weight, high strength, good overall connectivity, and convenient construction. Therefore, it can not only meet the requirements of water and soil engineering, but also can be used in roof leakage prevention, landscaping, soil conservation of river embankment slopes, seepage prevention and soil and water conservation of farmland canals, reclamation of tidal flats, landfills in environmental engineering, and thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08K5/134C08K5/13C08K5/526C08K5/372C08K5/098
CPCC08L23/0815C08L2201/08C08L2203/16C08L2205/025C08K5/1345C08K5/13C08K5/526C08K5/372C08K5/098
Inventor 鲍光复徐振明傅勇姜志荣
Owner SINOPEC YANGZI PETROCHEM
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