High-density polyethene micro porous membrane and preparation method therefor

A high-density polyethylene and microporous membrane technology, which is applied in the field of membrane materials, can solve the problems of complex membrane production process, large amount of solvents, environmental pollution, etc., and achieve the effect of simplifying the process, uniform pore distribution, and eliminating the extraction process

Active Publication Date: 2015-10-21
XINXIANG ZHONGKE SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the Bellcore technology of heat-induced phase separation and extraction of plasticizers can produce microporous membranes with uniform pore size distribution, there are two problems in the process: (1) A large amount of solvent is required during the preparation process, and improper handling can easily cause environmental pollution. pollution; (2) The process needs to go through an extraction process, and the membrane making process is relatively complicated

Method used

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  • High-density polyethene micro porous membrane and preparation method therefor
  • High-density polyethene micro porous membrane and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] High-density polyethylene microporous film, prepared from the following raw materials by weight percentage: high-density polyethylene resin A30%, high-density polyethylene resin B15%, a mixture of isodecane and n-decane (mixing ratio 2:3) 54.9 %, antioxidant CA0.1%.

[0034] Among them, high-density polyethylene resin A is: density of 0.93 g / cm3, Mw of 4.5×10 5 (Mw / Mn=28), HDPE (polyethylene homopolymer) with a melt flow rate of 0.6 g / 10min and an average particle size of 3.3mm;

[0035] High-density polyethylene resin B is: density is 0.96 g / cm3, Mw is 2.5×10 5 (Mw / Mn=31), HDPE (polyethylene homopolymer) with a melt flow rate of 0.4 g / 10min and an average particle size of 3mm.

[0036] The steps of the preparation method are:

[0037] (1) Preparation of molten liquid: take high-density polyethylene resin A and high-density polyethylene resin B and mix to form a high-density polyethylene resin, and put the mixed high-density polyethylene resin into a twin-screw extruder (D=110m...

Embodiment 2

[0042] The high density polyethylene microporous membrane has the same raw material ratio and composition as in Example 1.

[0043] The preparation method refers to Example 1. The difference from Example 1 is that in step (3), the preheating temperature is 40°C, and the hot air temperature (ie, the stretching temperature) is 105°C during the first longitudinal stretching. The stretching ratio is 3 times, and the heat setting temperature is set to 110°C; in step (4), the hot air temperature (ie stretching temperature) is 110°C, and the second simultaneous bidirectional stretching ratio is MD×TD=2×2= 4 times, the heat setting temperature is set to 115°C.

Embodiment 3

[0045] The high density polyethylene microporous membrane has the same raw material ratio and composition as in Example 1.

[0046] The preparation method refers to Example 1. The difference from Example 1 is that in step (3), the preheating temperature is 60°C, and the hot air temperature (ie, the stretching temperature) is 90°C during the first longitudinal stretching. The stretching ratio is 1 times, and the heat setting temperature is set to 95°C; in step (4), the hot air temperature (that is, the stretching temperature) is 70°C, and the second two-way simultaneous stretching ratio is MD×TD=4×4= 16 times, the heat setting temperature is set to 75°C.

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Abstract

The invention discloses a high-density polyethene micro porous membrane and a preparation method therefor, and belongs to the field of a film material. The method comprises the steps of: mixing raw materials, melting the mixed raw materials to form thick sheets, and then stretching the thick sheets twice: (1) stretching the thick sheets for the first time: preheating the thick sheets at the temperature of 40-130 DEG C, performing longitudinal stretching under the effect of thermal wind at 90-130 DEG C, wherein the stretching multiple rate is 1-10, and then performing heat shaping so as to obtain the films; (2) performing stretching for the second time: performing lateral uniaxial stretching or vertical and lateral bisynchronous stretching on the films prepared in the step (1) under the effect of thermal wind at 70-110 DEG C, maintaining stretching state for 2-4 minutes, wherein the multiple rate of lateral uniaxial stretching is 1-10, and the total multiple rate of vertical and lateral bisynchronous stretching is 4-16; and then, performing heat shaping so as to obtain finished products. According to the preparation method, in the stretching process, under the effect of thermal wind, a hole forming agent is rapidly volatilized from the films so as to form a micropore structure in mutual penetration, so that an extraction technology is omitted, the consumption of an extracting solvent is further reduced, the cost is reduced and the technological process is simplified.

Description

technical field [0001] The invention belongs to the field of membrane materials, and in particular relates to a high-density polyethylene microporous membrane and a preparation method thereof. Background technique [0002] Polyethylene microporous membrane is a kind of polymer microporous membrane. Polymer microporous membrane usually refers to a thin film with a certain porosity inside the polymer membrane. The preparation techniques of polymer porous membrane include non-solvent-induced phase inversion method (DIPS), direct pore-forming method, thermally induced phase separation and extraction plasticization. Agent Bellcore technology, phase inversion method and complete evaporation method. [0003] Due to the rapid development of the new energy industry and the wide application of water treatment membranes, polyethylene microporous membranes have become one of the porous membrane materials commercialized on a large scale, and their market share is increasing. [0004] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08K5/01C08K5/13C08K5/134C08K5/526
CPCC08K5/01C08K5/134C08L23/06C08L23/0815C08L2203/16C08L2205/025C08L2207/062C08K5/13C08K5/526
Inventor 荆正军焦令宽王向东贾峰樊鹏鹏南明见
Owner XINXIANG ZHONGKE SCI&TECH
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