Asymmetric polyolefin degassing membrane and preparation method thereof

A technology of degassing membranes and polyolefins, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of insufficient stretching ratio of membrane materials, reduced membrane corrosion resistance, and easy leakage of liquid, etc., to achieve optimal mechanical Performance and anti-corrosion effect, excellent anti-corrosion performance, effect of prolonging service life

Pending Publication Date: 2020-06-30
HANGZHOU COBETTER FILTRATION EQUIP
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The polyolefin film obtained by using the above method has the following problems in applications such as ink degassing: the stretching rate of the film material per unit area is not enough, resulting in the film material being easily stretched and deformed in a shaking environment, and problems such as liquid leakage are prone to occur; The thickness of the separation layer is very thin, and the uniformity of the pore structure distribution in the separation layer is not good, resulting in poor mechanical strength of the membrane material, and also reduces the corr

Method used

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  • Asymmetric polyolefin degassing membrane and preparation method thereof
  • Asymmetric polyolefin degassing membrane and preparation method thereof
  • Asymmetric polyolefin degassing membrane and preparation method thereof

Examples

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Example Embodiment

[0069] Example 1

[0070] Example 1 provides an asymmetric poly(4-methyl-1-pentene) film, which is prepared by the following method:

[0071] S1, put 45wt% poly(4-methyl-1-pentene) into the twin-screw extruder, heat to plasticize, then add 38wt% methyl-12-hydroxystearic acid and 17wt% adipic acid It is composed of dioctyl ester, stirred and kneaded at 220°C to obtain a homogeneous casting solution;

[0072] S2, extruding the film casting liquid from a die with a temperature of 210°C to obtain a molded film;

[0073] S3, the formed film is separated into an air section with a length of 50mm, the separation residence time is 45ms, the relative humidity of the air section is 50%, the temperature is 20℃, and the film is wound at a speed of 60m / min. Then enter the quenching liquid for quenching for 3 hours. The quenching liquid is the solvent system used in the preparation of the film casting liquid, and the quenching temperature is 80°C to obtain the green film after quenching;

[0074] S...

Example Embodiment

[0084] Example 7

[0085] Example 7 provides an asymmetric polypropylene film, which is prepared by the following method:

[0086] S1: Put 47wt% polypropylene into a twin-screw extruder, heat it to plasticize, then add 35wt% dibutyl sebacate and 18wt% palm oil, stir and knead at 170°C to obtain a homogeneous casting Membrane liquid

[0087] S2, extruding the film casting liquid from a die with a temperature of 165°C to obtain a molded film;

[0088] S3, the formed film is separated into an air section with a length of 50mm, the separation residence time is 45ms, the relative humidity of the air section is 50%, the temperature is 20℃, and the film is wound at a speed of 60m / min. Then enter the quenching liquid for quenching for 3 hours. The quenching liquid is the solvent system used in the preparation of the film casting liquid, and the quenching temperature is 60 ℃, and the film is obtained by quenching;

[0089] S4, extract the green film with isopropanol at 55°C for 8 hours to remo...

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Abstract

The invention provides an asymmetric polyolefin degassing membrane which is provided with a porous support layer and a compact separation layer, wherein the average pore diameter of the support layeris 100-5000 nm, and the average pore diameter of the separation layer is 0.1-10 nm; the thickness of the separation layer is 0.5-5 [mu]m, and the thickness ratio of the separation layer to the supportlayer is 1:80-1:200. according to the asymmetric polyolefin film provided by the invention, the separation layer thickness is large, and the more proper thickness ratio of the separation layer to thesupport layer is realized; the polyolefin degassing film has better tensile property and remarkable corrosion resistance, liquid with low surface tension is effectively prevented from breaking through the film material, especially when the polyolefin degassing film is used for ink degassing, the breaking time is far longer than that of other polyolefin degassing films obtained by using solvent systems, and the service life of the polyolefin degassing film is greatly prolonged.

Description

technical field [0001] The present application relates to the technical field of filter membrane materials, in particular to an asymmetric polyolefin degassing membrane and a preparation method thereof. Background technique [0002] Polyolefin membrane is a branch of membrane filtration industry, which can be used in gas-liquid separation, liquid-liquid separation, gas-gas separation and other environments. Generally speaking, polyolefin films have a certain degree of hydrophobicity, which is especially suitable for ink degassing, liquid degassing, pure water deoxygenation and other fields; at the same time, because some polyolefin materials have certain hydrophilic properties, or can be hydrophilic It can also be used in industries such as pure water filtration and separation. In particular, some polyolefin materials have certain gas selectivity, and can also be used in gas separation fields such as nitrogen and oxygen separation. [0003] In actual production, the proces...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D67/00
CPCB01D71/26B01D67/0013B01D2325/30
Inventor 贾建东陈梦泽
Owner HANGZHOU COBETTER FILTRATION EQUIP
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