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A kind of polyvinylidene fluoride microporous membrane and preparation method thereof

A polyvinylidene fluoride and microporous membrane technology, which is applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problem of single preparation function and achieve the effect of broadening the application field

Active Publication Date: 2020-09-01
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, all of the above are the preparation of superphilic or superhydrophobic polymer separation membranes with a single function, and there are few related reports on the simultaneous realization of superhydrophilic / superhydrophobic on the same substrate.

Method used

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  • A kind of polyvinylidene fluoride microporous membrane and preparation method thereof
  • A kind of polyvinylidene fluoride microporous membrane and preparation method thereof
  • A kind of polyvinylidene fluoride microporous membrane and preparation method thereof

Examples

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preparation example Construction

[0023] The invention provides a preparation method of polyvinylidene fluoride microporous membrane, which comprises the following steps:

[0024] S1, dissolving polyvinylidene fluoride in an organic solvent to obtain polyvinylidene fluoride casting liquid;

[0025] S2, coating a driving agent on a substrate with a rough surface, drying to obtain a support layer, wherein the driving agent is a mixture of glycerin, mineral oil, vegetable oil, animal oil or silicone oil and ethanol;

[0026] S3, coating the polyvinylidene fluoride casting solution obtained in step (1) on the surface of the support layer to form a nascent film coating the polyvinylidene fluoride casting solution obtained in step S1 on the surface of the support layer to form nascent film;

[0027] S4, transfer the support layer with the primary film to a reactive coagulation bath and solidify at 40°C to 80°C to obtain a polyvinylidene fluoride microporous film with a support layer, wherein the solvent used in the...

Embodiment 1

[0054] Step (1) Add 15g of polyvinylidene fluoride and 85g of triethyl phosphate into the reactor, and mechanically stir at 200r / min at 80°C for 4 hours, then vacuum defoaming for 30 minutes, and then stand for defoaming for 12 hours to obtain Polyvinylidene fluoride casting liquid;

[0055] Step (2) Soak the non-woven fabric with a mixed solution of glycerol and ethanol (the mass fraction of glycerol is 30%), and dry it at room temperature to obtain a support layer;

[0056] Step (3) uniformly coat the polyvinylidene fluoride casting solution on the support layer made of non-woven fabric with a 300-micron scraper, and dry to obtain the nascent film;

[0057] Step (4) Transfer the nascent membrane into a reactive coagulation bath at 30°C and immerse it for 1 minute, then transfer it to deionized water at 60°C and place it for 24 hours to obtain a polyvinylidene fluoride microporous membrane with a support layer, wherein The reactive coagulation bath is to add 3g hydroxyethyl ...

Embodiment 2

[0065] Step (1) Add 14g of polyvinylidene fluoride, 6g of polyethylene glycol, and 80g of N,N-dimethylformamide into the reactor, and mechanically stir at 300r / min at 65°C for 6 hours, then vacuum defoam for 35 minutes , and then stand still for degassing for 16 hours to obtain polyvinylidene fluoride casting solution;

[0066] Step (2) coating the mixed solution of glycerol and ethanol (the mass fraction of glycerol is 40%) on the rough surface of the non-woven fabric, and drying at room temperature to obtain a support layer;

[0067]Step (3) uniformly coat the polyvinylidene fluoride casting solution on the support layer made of non-woven fabric with a 300-micron scraper, and dry to obtain the nascent film;

[0068] Step (4) Transfer the nascent membrane into a reactive coagulation bath at 30°C and immerse it for 10 minutes, then transfer it into deionized water at 50°C and place it for 40 hours to obtain a polyvinylidene fluoride microporous membrane with a support layer, w...

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride microporous membrane. The method adopts a non-solvent induced phase separation method, and hydrophilic polymer with alkoxy silane in a coagulating bath can slowly permeate into a primary membrane during curing of the coagulating bath. As a supporting layer bearing the primary membrane is coated with a driving agent in advance, the hydrophilic polymer with the alkoxy silane can be distributed to the surface, far from the supporting layer, of the primary membrane under the action of the driving agent and performs self-corsslinking, and the fact that the surface, far from the supporting layer, of the primary membrane has super hydrophilicity is realized. As a substrate has a rough surface and crystalline characteristicof polyvinylidene fluoride, the surface, close to the supporting layer, of the primary membrane forms a micro-nano structure and shows super hydrophilicity. The invention further provides thepolyvinylidene fluoride microporous membrane.

Description

technical field [0001] The invention relates to the field of polymer microporous membranes, in particular to a polyvinylidene fluoride microporous membrane and a preparation method thereof. Background technique [0002] Wetting is a common interface phenomenon of polymer separation membranes, and it is also one of the important properties of the membrane. The contact angle of the liquid on the membrane surface is usually used to characterize the hydrophobicity and hydrophilicity of the membrane. [0003] Studies have shown that the wettability of the membrane surface is jointly determined by the chemical composition and microstructure of the membrane surface. Appropriate microstructure and surface free energy are prerequisites for the formation of superhydrophilic or superhydrophobic surfaces of polymer separation membranes. This kind of membrane material with superhydrophilicity or superhydrophobicity is widely used in the fields of self-cleaning, microfluid transportation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D71/34
CPCB01D61/147B01D67/0002B01D69/02B01D71/34B01D2325/36B01D2325/38
Inventor 刘富林海波李田田
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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