Method for preparing chemically perforated polyvinylidene fluoride hollow fiber ultrafiltration membrane

A polyvinylidene fluoride and ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of low pore size and pore density, insufficient mechanical strength of the membrane, and inability to fully meet production needs, etc. problems, achieve high rejection rate, improve membrane flux and rejection rate

Active Publication Date: 2012-07-04
SUZHOU CNPT SOURCETECH ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In CN1418923A and CN1128176A patents, it is recorded that after polyvinylidene fluoride, solvent, polymer pore forming agent (such as polyvinylpyrrolidone and polyethylene glycol), non-solvent, surfactant, etc. are mixed, they interact and interact with each other. coordination, the prepared membrane has a thinner skin layer, fully developed macroporous structure, and better flux, but the mechanical strength of the membrane prepared by this method is insufficient and cannot fully meet the production needs
The ultrafiltration membrane prepared by this method has a high pressure resistance, while retaining the strength and toughness of the inorganic nanoparticles, but the ultrafiltration membrane with the addition of inorganic nanoparticles has a dense porosity structure, and the pore size and pore density are not high, which cannot meet the requirements. High-throughput membrane industry needs

Method used

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  • Method for preparing chemically perforated polyvinylidene fluoride hollow fiber ultrafiltration membrane
  • Method for preparing chemically perforated polyvinylidene fluoride hollow fiber ultrafiltration membrane
  • Method for preparing chemically perforated polyvinylidene fluoride hollow fiber ultrafiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The preparation steps are as follows (see figure 1 shown):

[0036] 1) Preparation of film casting solution: Add polyvinylidene fluoride, chemical porogen, solvent and additives into the stirring tank 1 according to the following ratio, stir and blend at a constant temperature, and then pour it into the defoaming tank 2 Static defoaming at constant temperature to obtain a homogeneous casting solution;

[0037] (2) Spinning hollow fiber membranes: at the spinning speed set by the dry-wet spinning equipment, the core liquid in the core liquid tank 3 is injected into the spinneret according to the set core liquid volume and the homogeneous casting liquid 4. Extrude the homogeneous casting liquid and the core liquid from the spinneret 4 to obtain polyvinylidene fluoride hollow fiber membranes.

[0038](3) Phase-separation treatment: Step 2) After the polyvinylidene fluoride hollow fiber membrane obtained has a dry distance of 1-30 cm, it enters the first gel bath 5 and th...

Embodiment 2

[0046] The preparation steps are the same as in Example 1, and the specific preparation conditions are as follows:

[0047]

[0048] The inner diameter of the obtained hollow fiber ultrafiltration membrane is about 0.96mm, the outer diameter is about 1.47mm, and the pure water flux under 0.1MPa reaches 684L / (m 2 · h), the rejection rate of BSA is basically maintained above 90%, and the tensile strength is about 3.1MPa.

Embodiment 3

[0050] The preparation steps are the same as in Example 1, and the specific preparation conditions are as follows:

[0051]

[0052] The inner diameter of the obtained hollow fiber ultrafiltration membrane is about 0.78mm, the outer diameter is about 1.34mm, and the pure water flux under 0.1MPa reaches 430L / (m 2 · h), the rejection rate of BSA is basically kept above 95%, and the tensile strength is about 3.5MPa.

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Abstract

The invention discloses a method for preparing a chemically perforated polyvinylidene fluoride hollow fiber ultrafiltration membrane. The method comprises the following steps of: stirring and mixing polyvinylidene fluoride, a solvent, an additive and a chemical perforation agent, and preparing homogeneous membrane casting liquid; squeezing the membrane casting liquid and core liquid out from a spinning nozzle, and forming the membrane in an outer gel bath with certain components; and performing gel phase inversion and chemical post-treatment on the membrane, and thus obtaining the high-flux polyvinylidene fluoride hollow fiber ultrafiltration membrane. The method has the characteristics that: chemical enhanced perforation is performed by changing the composition of the core liquid, performing gel phase inversion and performing post-treatment according to reaction among between the core liquid, the gel bath and the post-treatment liquid and the chemical perforation agent, so that high flux, high intensity, high retention rate and high hydrophilism polyvinylidene fluoride ultrafiltration membrane can be prepared. The prepared polyvinylidene fluoride hollow fiber ultrafiltration membrane is high in performance; the flux is greater than 580 L/(m<2>h) in pure water; and the retention rate of bovine serum albumin (BSA) is over 95 percent.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride hollow fiber ultrafiltration membrane, in particular to a preparation method of a chemically pore-induced polyvinylidene fluoride hollow fiber ultrafiltration membrane. Background technique [0002] Polyvinylidene fluoride is an excellent polymer membrane material because of its excellent chemical stability, radiation resistance, thermal stability and easy film formation. The polyvinylidene fluoride hollow fiber ultrafiltration membrane prepared by it can be Widely used in filtration and separation in various fields. However, due to the typical linear polymer structure and strong hydrophobic properties of polyvinylidene fluoride, the polyvinylidene fluoride ultrafiltration membrane has poor strength, easy deformation, and no pressure resistance in the actual application process. And its application is limited due to its strong hydrophobicity, low flux and susceptibility to irre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 王磊孙兵王旭东赵解杨容志勇周刚苗瑞吕永涛余铭皋孟晓荣黄丹曦柴续斌
Owner SUZHOU CNPT SOURCETECH ENVIRONMENTAL TECH
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