Polyvinyl chloride hollow fiber ultrafiltration membrane and preparation method thereof

A technology of polyvinyl chloride and ultrafiltration membranes, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of low elongation at break, low traction speed, and less water flow, and achieve elongation at break High, high traction speed, large water flow effect

Inactive Publication Date: 2017-12-19
广东万和净水设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing PVC hollow fiber membranes generally have shortcomings such as low water flow, low elongation at break, weak hydrophilicity, low tolerable traction speed, and weak applicability. Therefore, further improvement is needed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0020] The polyvinyl chloride hollow fiber ultrafiltration membrane is prepared from the corresponding casting solution, which includes by weight percentage: 12% polyvinyl chloride, 9% hydrophilic agent, 10% pore-forming agent, and 69% solvent .

[0021] Among them, the hydrophilic agent is a binary copolymer of vinyl chloride and vinyl acetate; the pore-forming agent is one or a mixture of polyethylene glycol and polyvinylpyrrolidone; the solvent is dimethylacetamide, dimethyl formaldehyde One or a mixture of two amides.

[0022] The preparation method of the polyvinyl chloride hollow fiber ultrafiltration membrane of the present embodiment comprises the following steps:

[0023] A, prepare film-casting solution according to each component of described weight ratio;

[0024] B. Fully stir the casting liquid at 60 degrees Celsius to remove air bubbles;

[0025] C. Pump the film-casting solution into the insert tube type hollow fiber spinneret, the pulling speed is 32 m / min,...

no. 2 example

[0028] The polyvinyl chloride hollow fiber ultrafiltration membrane is prepared from the corresponding casting solution, which includes: 10% polyvinyl chloride, 10% hydrophilic agent, 11% pore forming agent, and 69% solvent .

[0029] Wherein, the hydrophilic agent is a binary copolymer of vinyl chloride and vinyl acetate; the pore-forming agent is a mixture of polyethylene glycol and polyvinylpyrrolidone; and the solvent is a mixture of dimethylacetamide and dimethylformamide.

[0030] The preparation method of the polyvinyl chloride hollow fiber ultrafiltration membrane of the present embodiment comprises the following steps:

[0031] A, prepare film-casting solution according to each component of described weight ratio;

[0032] B. Fully stir the casting liquid at 60 degrees Celsius to remove air bubbles;

[0033] C. Pump the film-casting solution into the insert tube type hollow fiber spinneret with a traction speed of 35 m / min. After staying in the air for 1 second, ent...

no. 3 example

[0036] The polyvinyl chloride hollow fiber ultrafiltration membrane is prepared from the corresponding casting solution, which includes: 13% polyvinyl chloride, 10% hydrophilic agent, 10% pore forming agent, and 67% solvent .

[0037] Wherein, the hydrophilic agent is a binary copolymer of vinyl chloride and vinyl acetate; the pore-forming agent is a mixture of polyethylene glycol and polyvinylpyrrolidone; and the solvent is a mixture of dimethylacetamide and dimethylformamide.

[0038] The preparation method of the polyvinyl chloride hollow fiber ultrafiltration membrane of the present embodiment comprises the following steps:

[0039] A, prepare film-casting solution according to each component of described weight ratio;

[0040] B. Fully stir the casting liquid at 45 degrees Celsius to remove air bubbles;

[0041] C. Pump the film-casting solution into the tube-type hollow fiber spinneret with a traction speed of 100 m / min. After staying in the air for 0.3 seconds, enter ...

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Abstract

The invention relates to a polyvinyl chloride hollow fiber ultrafiltration membrane. A membrane casting solution used for preparing the polyvinyl chloride hollow fiber utlrafiltration membrane is prepared from ingredients in weight percentage: 10 to 30% of polyvinyl chloride, 3 to 10% of hydrophilic agent, 5 to 10% of pore forming agent and 50 to 82% of solvent. A preparation method of the polyvinyl chloride hollow fiber ultrafiltration membrane comprises the following steps: A, preparing the membrane casting solution by all the ingredients according to the weight ratio; B, fully and evenly stirring the membrane casting solution under 45 to 80 DEG C to remove air bubbles; C, pumping the membrane casting solution into an insert tube type hollow fiber spinning nozzle, staying in air 0.2 to 2 seconds and entering solidifying water bath to form the membrane, wherein a traction speed is 30 to 110meter/minute. The polyvinyl chloride hollow fiber ultrafiltration membrane disclosed by the invention has the following beneficial effects of longer service life, larger water discharge capacity, lower energy consumption, high elongation at break, strong hydrophilicity, high bearable pulling speed and strong applicability.

Description

technical field [0001] The invention relates to a filter membrane used for separating bacteria, viruses and other substances, in particular to a polyvinyl chloride hollow fiber ultrafiltration membrane and a preparation method thereof. Background technique [0002] Polyvinyl chloride hollow fiber membrane is a kind of hollow fiber with microporous structure, and the diameter of the micropore is generally 0.008~0.01 micron, which is used to separate bacteria, viruses and other substances whose particle size is larger than the micropore; the traditional preparation of polyvinyl chloride hollow fiber membrane The method is generally prepared by dry-wet method, that is, a certain proportion of coagulation liquid is passed into the center of the fiber to form a tubular fiber with a microporous structure; in addition, the polyvinyl chloride hollow fiber membrane with a microporous membrane wall is both It can be used to separate mixed gases, and can also be used for ultrafiltratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/30B01D69/02B01D69/08B01D67/00B01D61/14
CPCB01D61/145B01D67/0002B01D69/02B01D69/08B01D71/30B01D2325/24B01D2325/36
Inventor 李日升
Owner 广东万和净水设备有限公司
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