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A modified polymer microporous membrane and a preparing method thereof

A polymer and microporous membrane technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of degradation of modification effect, decline of membrane mechanical properties, poor compatibility, etc., and achieve simple process, mild conditions, The effect of stabilizing surface properties

Active Publication Date: 2017-11-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of method has two significant defects: (1) the hydrophilic substances of small molecules will gradually seep out during the use and storage of the membrane, resulting in a decrease in the hydrophilicity of the membrane; (2) the hydrophilic substances of large molecules Hydrophilic substances of different types often have problems such as poor compatibility and a sharp drop in mechanical properties of the membrane.
In the surface coating method, the coating layer and the membrane surface generally only rely on weak intermolecular forces to bond, so during use, the coating layer is easily peeled off from the membrane surface due to swelling, washing, etc., and as time goes on, The modification effect will gradually degrade or even disappear

Method used

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  • A modified polymer microporous membrane and a preparing method thereof
  • A modified polymer microporous membrane and a preparing method thereof
  • A modified polymer microporous membrane and a preparing method thereof

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preparation example Construction

[0028] The invention provides a preparation method of a modified polymer microporous membrane, which comprises the following steps:

[0029] S1, providing a siloxane prepolymerization solution, and diluting the siloxane prepolymerization solution with a diluent;

[0030] S2, placing the polymer microporous membrane in the diluted siloxane prepolymer solution for immersion treatment; and

[0031] S3, performing a pre-crosslinking reaction on the impregnated polymer microporous membrane to obtain the modified polymer microporous membrane.

[0032] In step S1, the diluent is used to dilute the siloxane prepolymer solution. The diluent is a mixture of water and ethanol. The mixing ratio of the water and ethanol is not limited. The volume ratio of the siloxane prepolymer liquid to the diluent is 1:4˜4:1.

[0033] The preparation method of described siloxane prepolymer liquid is as follows:

[0034] S11, adding polyalkoxysilane, functional monomer and initiator into an inert or...

Embodiment 1

[0054] (1) Add 3g of hydroxyethyl methacrylate, 2g of vinyltrimethoxysilane and 0.06g of benzoyl peroxide to 100mL of dehydrated ethanol in turn, pass through industrial nitrogen, and 200r at room temperature / min Mechanical stirring for 20min. Then turn on the heating and gradually increase the temperature to 65° C., and react with mechanical stirring at 200 r / min for 36 hours in an industrial nitrogen atmosphere. Turn off the heating, and obtain a hydrophilic hydroxyethyl methacrylate / vinyltrimethoxysilane copolymer prepolymer liquid after cooling down sufficiently. Add 40mL of deionized water to the obtained 100mL prepolymerization solution to obtain a diluted prepolymerization solution.

[0055] (2) Soak the polysulfone microporous membrane with a surface average pore diameter of 500nm into the diluted pre-polymerization solution, remove the air bubbles in the pre-polymerization solution by shaking, and then soak for 5 hours.

[0056] (3) Take out the polysulfone micropo...

Embodiment 2

[0059] (1) Add 4g of N-vinylpyrrolidone, 3g of vinyltriethoxysilane and 0.1g of azobisisoheptyl cyanide to 100mL of triethyl phosphate successively, feed high-purity nitrogen, and Mechanically stir at 250r / min for 30min at room temperature. Then turn on the heating and gradually increase the temperature to 80°C, and react with mechanical stirring at 250r / min for 24 hours in an industrial nitrogen atmosphere. Turn off the heating, and obtain a hydrophilic N-vinylpyrrolidone / vinyltriethoxysilane copolymer prepolymer liquid after cooling down sufficiently. Add 100 mL of 50% ethanol aqueous solution to the obtained 100 mL prepolymer solution to obtain a diluted prepolymer solution.

[0060] (2) Soak the polyvinylidene fluoride pore membrane with a surface average pore diameter of 2 μm in the diluted pre-polymerization solution, remove air bubbles in the pre-polymerization solution by shaking, and then soak for 2 hours.

[0061] (3) Take out the polyvinylidene fluoride porous mem...

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Abstract

The invention relates to a modified polymer microporous membrane. The modified polymer microporous membrane includes a polymer microporous membrane and a crosslinked layer attached to the surface of the polymer microporous membrane. The crosslinked layer is formed by subjecting the surface of the polymer microporous membrane to crosslinking modification by utilizing a siloxane prepolymer solution. The siloxane prepolymer solution includes a prepolymer and an inert organic solvent. The prepolymer is a copolymer prepared by polymerizing multi-alkoxy silane and a functional monomer. The invention also relates to a preparing method of the modified polymer microporous membrane.

Description

technical field [0001] The invention relates to the field of polymer microporous membranes, in particular to a modified polymer microporous membrane prepared by surface crosslinking modification and a preparation method thereof. Background technique [0002] According to different materials, membranes can be divided into inorganic membranes and organic membranes, where organic membranes mainly refer to polymer membranes. Compared with inorganic membranes, polymer membranes have the advantages of low cost, good processability, low density, easy storage and transportation, and a wide variety of materials, so they can be widely used in microfiltration, ultrafiltration, nanofiltration, reverse osmosis, Dialysis, pervaporation, gas separation and other fields. However, because the surface energy of the polymer membrane is generally low and the wettability to water is poor, the surface of the membrane is easy to adsorb various protein pollutants and breed bacteria, so that the su...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/34B01D71/42B01D71/48B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D71/34B01D71/42B01D71/48B01D71/68B01D71/70B01D2325/36B01D2325/48
Inventor 刘富林海波
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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