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High-flexibility geomembrane and preparation method for same

A geomembrane, high flexibility technology, applied in the direction of chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problem of easily damaged geomembrane fixing facilities, affecting construction and construction quality, and large coefficient of thermal expansion and contraction and other problems, to achieve good chemical stability, high unidirectional and multi-extension performance, and improved safety

Inactive Publication Date: 2015-04-15
SHANDONG TIANHE PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The geomembranes on the market are mainly HDPE and LLDPE co-extruded geomembranes. The disadvantages of the existing HDPE and LLDP geomembranes: 1. The coefficient of thermal expansion and contraction is large, and the membrane surface after construction relaxes when hot and tightens when cold, which affects construction. 2. Cold brittleness: it becomes brittle at low temperature, and the membrane after construction may crack when the temperature is very low, causing direct economic losses or engineering rework

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] High flexible geomembrane of the present invention, raw material and weight percentage thereof are:

[0025]

[0026] Among them, the HDPE butene molar ratio is 1.8%, the weight average molecular weight is 230,000, the molecular weight distribution is 18, and the relative branching degree is 0.20; the LLDPE butene molar ratio is 2.1%, the weight average molecular weight is 110,000, the molecular weight distribution is 3, and the relative branching degree is 2.1%. Degree 1.0.

[0027] The preparation method of highly flexible geomembrane of the present invention is as follows:

[0028] Weigh the above raw materials according to the formula, and mix them in the mixer for 30 minutes at room temperature. The fully mixed raw materials are sent to the feed port of the extruder through the suction machine. The temperature of the screw barrel is 180°C. After melting and mixing uniformly in the extruder, it enters the three-layer co-extrusion die head with a temperature of 2...

Embodiment 2

[0034] High flexible geomembrane of the present invention, raw material and weight percentage thereof are:

[0035]

[0036] Among them, the HDPE butene molar ratio is 2.5%, the weight average molecular weight is 280,000, the molecular weight distribution is 21, and the relative branching degree is 0.24; the LLDPE butene molar ratio is 2.7%, the weight average molecular weight is 110,000, the molecular weight distribution is 4, and the relative branching degree is 2.7%. Degree 1.4.

[0037] The preparation method of highly flexible geomembrane of the present invention is as follows:

[0038] The above raw materials are weighed according to the formula, and mixed in a mixer at room temperature for 40 minutes. The fully mixed raw materials are sent to the feed port of the extruder through the suction machine. The screw speed of the extruder is 20 min / rev. The temperature of the section screw barrel is 140°C. After melting and mixing uniformly in the extruder, it enters the t...

Embodiment 3

[0044] High flexible geomembrane of the present invention, raw material and weight percentage thereof are:

[0045]

[0046] Among them, the molar ratio of HDPE butene is 3%, the weight average molecular weight is 300,000, the molecular weight distribution is 23, and the relative branching degree is 0.3; the LLDPE butene molar ratio is 3%, the weight average molecular weight is 150,000, the molecular weight distribution is 5, and the relative branching degree is 5%. Degree 1.8.

[0047] The preparation method of highly flexible geomembrane of the present invention is as follows:

[0048] The above raw materials are weighed according to the formula, and mixed in a mixer at room temperature for 20 minutes, and the fully mixed raw materials are sent to the feed port of the extruder through a suction machine, and the screw speed of the extruder is 30 min / rev. The temperature of the section screw barrel is 220°C. After melting and mixing uniformly in the extruder, it enters the...

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Abstract

The invention relates to a high-flexibility geomembrane and a preparation method for the same. The high-flexibility geomembrane comprises the following raw materials in percentage by weight: 20-60% of HDPE (high density polyethylene), 10-55% of LLDPE (linear low density polyethylene), 20-65% of elastomer, and 5-10% of carbon black master batch, wherein the total percentage of the raw materials is 100. The preparation method comprises the following steps of: weighing and uniformly mixing the raw materials aforementioned according to a formula; pouring the raw materials in an extruder, and melting and uniformly mixing in the extruder; conveying the raw materials in a three-layer co-extrusion extruder, and extruding from a circular die orifice; blowing up via air, and cooling to form a tubular membrane; and splitting, flattening and rolling to obtain the product. The high-flexibility geomembrane disclosed by the invention is greatly improved in elongation at break, puncture resistance, cold brittleness resistance and bending resistance; and the geomembrane is improved in safety during a use process.

Description

technical field [0001] The invention relates to a highly flexible geomembrane and a preparation method thereof. Background technique [0002] Highly flexible geomembrane is often used in projects requiring high anti-cold brittleness in high latitude areas, or in projects with uneven settlement or large local settlement, such as mine heap leaching sites, landfills and other extensions to anti-seepage materials. Projects with high performance and puncture strength requirements. [0003] The geomembranes on the market are mainly HDPE and LLDPE co-extruded geomembranes. The disadvantages of the existing HDPE and LLDP geomembranes: 1. The coefficient of thermal expansion and contraction is large, and the membrane surface after construction relaxes when hot and tightens when cold, which affects construction. 2. Cold brittleness: it becomes brittle at low temperature, and the membrane after construction may crack when the temperature is very low, causing direct economic losses or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/08B32B27/06B32B27/32B29C55/28B29C47/06B29C47/92B29C48/92
CPCB29C47/92B29C48/92B29C2948/92704B29C2948/92895
Inventor 杨彦张文瑞
Owner SHANDONG TIANHE PLASTIC
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