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Method for preparing polyvinylidene fluoride alloy film

A polyvinylidene fluoride and alloy membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as unfriendly environment, difficult cleaning, complicated process, etc., and achieve reduced production costs and easy cleaning , good performance

Inactive Publication Date: 2013-01-16
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the diluents currently used are non-water-soluble latent solvents, which are insoluble in water. Therefore, other extractants must be used to extract them after film formation. The process is complicated and unfriendly to the environment.
In addition, due to the hydrophobicity of PVDF, simple PVDF membranes are easily polluted by organic matter in water during application, and are not easy to clean.

Method used

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  • Method for preparing polyvinylidene fluoride alloy film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Accurately weigh 185g of caprolactam, 60g of polyvinylidene fluoride, and 2.5g of polyvinylpyrrolidone. Stir the above three raw materials evenly and pour them into a 500mL jar with a stopper. Under the condition of slow nitrogen protection, use oil Bath heating, the temperature of the oil bath used is 140 ° C, heating to completely dissolve the raw materials, and keeping at 140 ° C for 45 minutes, then stirring the solution with an electric stirrer for 30 minutes, and then standing in the oil bath for defoaming to obtain the casting solution , and then keep the casting solution at 140°C for preservation. Pour the obtained film-casting solution into a template and scrape it into a film, place it in the air to cool naturally until it is completely solidified, and then put it into water to dissolve the diluent caprolactam to obtain a polyvinylidene fluoride alloy film. The thickness of the vinyl fluoride alloy film was 125 μm.

[0021] The SEM image of the mor...

Embodiment 2

[0023] Example 2: Accurately weigh 182.5g of caprolactam, 62.5g of polyvinylidene fluoride, and 5.1g of polyvinylpyrrolidone. Stir the above three raw materials evenly and pour them into a 500mL jar with a stopper. Under the condition of slow nitrogen protection, Heating in an oil bath, the temperature of the oil bath used is 150°C, heating to completely dissolve the raw materials, and keeping at 150°C for 1 hour, then stirring the solution with an electric stirrer for 30 minutes, and then standing in the oil bath for defoaming to obtain a cast film solution, and then the casting solution was kept at 150°C. Pour the obtained film-casting solution into a template and scrape it into a film, place it in the air to cool naturally until it is completely solidified, and then put it into water to dissolve the diluent caprolactam to obtain a polyvinylidene fluoride alloy film. The thickness of the vinyl fluoride alloy film was 120 μm.

[0024] The pure water flux of the polyvinyliden...

Embodiment 3

[0025] Example 3: Accurately weigh 177.5g of caprolactam, 62.5g of polyvinylidene fluoride, and 10g of polyvinylpyrrolidone, stir the above three raw materials evenly, pour them into a 500mL jar with a stopper, and use Heating in an oil bath, the temperature of the oil bath used is 160 ° C, heating to completely dissolve the raw materials, and keeping at 160 ° C for 1.5 hours, then stirring the solution with an electric stirrer for 45 minutes, and then standing in the oil bath for defoaming to obtain a cast film solution, and then the casting solution was kept at 160°C. Pour the obtained film-casting solution into a template and scrape it into a film, place it in the air to cool naturally until it is completely solidified, and then put it into water to dissolve the diluent caprolactam to obtain a polyvinylidene fluoride alloy film. The thickness of the vinyl fluoride alloy film was 115 μm.

[0026] The pure water flux of the polyvinylidene fluoride alloy membrane prepared in ...

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Abstract

The invention relates to a method for preparing a polyvinylidene fluoride alloy film, which comprises the following steps: 1), uniformly mixing polyvinylidene fluoride, hydrophilic copolymers and caprolactam; 2, heating the mixed polyvinylidene fluoride, hydrophilic copolymers and caprolactam under the protection of nitrogen to a solution temperature, and maintaining for 0.5-2 h at the temperature; 3), after the polyvinylidene fluoride, hydrophilic copolymers and caprolactam are completely solved, stirring for 0.5-1.5 h and then standing to obtain a casting solution, and saving the casting solution at the solution temperature; 4), fabricating the casting solution to a film which is then placed in the air for natural cooling until complete solidification; and 5), finally, extracting caprolactam, actually the polyvinylidene fluoride alloy film, through an extracting agent. The method has the advantages of simple technology, zero contamination and lower cost. The prepared polyvinylidene fluoride alloy film has the advantages of superior chemical stability, high mechanical strength, contamination resistance and easiness in cleaning. The method provided by the invention can provide high-performance alloy film products for the MBR technology in the filed of sewage disposal and water resource recycle, and has an extensive application in the fields of industry, medicine, sewage disposal and the like.

Description

technical field [0001] The patent of the present invention belongs to the field of polymer material manufacturing, and specifically relates to a method for preparing a polyvinylidene fluoride alloy film, which belongs to a thermally induced phase separation method. Background technique [0002] Polyvinylidene fluoride (PVDF) has outstanding solvent resistance, acid and alkali resistance, ultraviolet resistance and weather resistance, and is an excellent membrane material. In recent years, polyvinylidene fluoride alloy membranes have been well applied in sewage purification treatment and biochemical pharmaceutical industries. [0003] Polyvinylidene fluoride alloy membrane is a kind of polymer porous membrane. There are many methods for the preparation of polymer porous membranes, mainly including phase inversion method, stretching method, sintering method and irradiation method, among which phase inversion method includes thermal induced phase separation method, non-solvent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00
Inventor 覃海姣肖通虎蔡新海
Owner NINGBO UNIV
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