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Preparation method of polyvinylidene fluoride microfiltration membrane

A technology of polyvinylidene fluoride and microporous membrane, which is applied in chemical instruments and methods, membranes, ultrafiltration, etc., can solve problems such as difficult to apply production costs, and achieve the effects of energy saving, strength improvement, and large pore size

Inactive Publication Date: 2018-07-10
四川美源环能科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the laboratory's research on the preparation of high-performance PVDF membranes has achieved certain results, but there are still some disadvantages such as the process is difficult to apply to industrial production and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of polyvinylidene fluoride microporous membrane:

[0037] (1) Add polyvinylidene fluoride with a molecular weight of 300,000, polyvinylpyrrolidone with a molecular weight of 10,000, and N,N-dimethylformamide into the batching kettle and mix them and stay for 8 hours to form a casting solution. The temperature in the batching kettle is 40°C, where the mass ratio of polyvinylidene fluoride, polyvinylpyrrolidone and N,N-dimethylformamide is 1:0.042:2.33;

[0038] (2) The casting liquid is degassed by negative pressure suction at -0.06MPa for 24 hours, and the bubbles in the casting liquid are released;

[0039] (3) Filter the casting solution after suction and defoaming and apply it to the surface of the non-woven support body through the coating machine. 2m / min;

[0040] (4) The non-woven support body coated with the casting solution in the process of coating and spreading is immersed in a gel bath formed by acetone at 0°C to obtain a polyvinylidene...

Embodiment 2

[0045] A preparation method of polyvinylidene fluoride microporous membrane:

[0046] (1) Add polyvinylidene fluoride with a molecular weight of 600,000, polyvinylpyrrolidone with a molecular weight of 90,000, and polyethylene glycol with a molecular weight of 400 in a molar ratio of 1:1, and N,N-dimethyl The polar solvent composed of methyl formamide and N,N-dimethylacetamide according to the molar ratio of 1:1 is added to the batching tank at 90°C, mixed and retained for 24 hours to prepare the casting solution;

[0047] (2) The casting liquid is degassed by suction at 0.1MPa negative pressure for 8 hours, and the bubbles in the casting liquid are released;

[0048] (3) Filter the casting liquid after suction and defoaming and apply it on the surface of the non-woven support body through the coating machine. 14m / min;

[0049] (4) The non-woven support body coated with the casting solution during the coating and spreading process is immersed in a gel bath composed of acetone ...

Embodiment 3

[0054] A preparation method of polyvinylidene fluoride microporous membrane:

[0055] (1) Polyvinylidene fluoride with a molecular weight of 500,000, an additive composed of polyethylene glycol with a molecular weight of 10,000, acetone and glycerin at a molar ratio of 1:5:3, and N,N-dimethylformaldehyde The polar solvent composed of amide, N,N-dimethylacetamide and dimethyl sulfoxide according to the molar ratio of 1:3:8 is added to a batching kettle at a temperature of 60°C, mixed and retained for 20 hours to prepare a casting solution;

[0056] (2) The casting liquid is degassed by suction at 0.05MPa negative pressure for 18 hours, and the bubbles in the casting liquid are released;

[0057] (3) Filter the casting solution after suction and defoaming and apply it on the surface of the non-woven support body through the coating machine. 10m / min;

[0058] (4) The non-woven fabric support body coated with the casting solution in the process of coating and spreading is immers...

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PUM

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Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a preparation method of a polyvinylidene fluoride microfiltration membrane. In the preparation process, polyvinylidene fluoride, additives and polar solvents are used as raw materials to be prepared into membrane casting liquid; then, sequentially through defoaming, coating, gel bath, hole protection, drying and the like, the polyvinylidene fluoride microfiltration membrane is formed. The prepared polyvinylidene fluoride microfiltration membrane has the characteristics of high flux, high retention rate and excellent mechanical property; the preparation technological process is simple and continuous; the industrialization is easy.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a preparation method of a polyvinylidene fluoride microporous filter membrane. Background technique [0002] With the wide application of membrane separation technology in the fields of food, environmental protection, medicine and biology, the development of membrane materials with high flux, high selectivity and strong anti-pollution performance has become the focus of the development of separation membrane materials today. [0003] The phase inversion method is the most commonly used method in the polymer membrane preparation technology at present. The thermodynamic state of the polymer solution system causes the phase separation of the polymer solution system to form a gel polymer with a three-dimensional network structure to solidify into a film. At present, the common method for the preparation of microporous membranes is the non-solvent-induced phase s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D61/14B01D67/00
CPCB01D61/147B01D67/0011B01D67/0016B01D69/02B01D71/34B01D2325/24B01D2325/36
Inventor 宋岱峰韩亮潘洋
Owner 四川美源环能科技有限责任公司
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