Preparation method and application of persistently hydrophilic polyvinylidene fluoride membrane

A technology of polyvinylidene fluoride film and polyvinylidene fluoride, which is applied in the field of preparation of durable hydrophilic polyvinylidene fluoride film, can solve problems such as waste of raw materials, cumbersome preparation methods, and easy volatility of ethanol, and achieve high pollution resistance , Simple membrane making process, high retention rate

Active Publication Date: 2017-11-21
SUZHOU SUJING NEW MATERIALS IN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent improves the separation limit to a certain extent, the test results of the ultrafiltration membrane prepared by it show that the water flux is only 90L / m at 0.1MPa 2 About h, and the preparation method is relatively cumbersome, and the ethanol after treatment is relatively volatile, which will cause waste of raw materials

Method used

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  • Preparation method and application of persistently hydrophilic polyvinylidene fluoride membrane
  • Preparation method and application of persistently hydrophilic polyvinylidene fluoride membrane
  • Preparation method and application of persistently hydrophilic polyvinylidene fluoride membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of persistent hydrophilic polyvinylidene fluoride flat sheet membrane:

[0037] (1) Preparation of casting solution: Add polyvinyl acetate, PVP-k30, and PEG-400 with mass content of 2%, 4%, and 7% respectively into N,N-dimethylethyl ether with mass content of 68%. In the amide, stir at 90°C until it is completely dissolved, then add polyvinylidene fluoride with a mass content of 19%, stir at 90°C until it is completely dissolved, and let the prepared mixture stand for defoaming to obtain the obtained Described casting solution (mass content in this step is the mass fraction that corresponding composition accounts for described casting solution);

[0038] (2) Preparation of durable hydrophilic polyvinylidene fluoride flat film: scrape the film on a clean glass plate with the prepared casting solution, then immerse in N,N-dimethylacetamide with a mass content of 15 % aqueous solution for 1 hour, and then placed in deionized water for phase inversion for 24 ho...

Embodiment 2

[0041] Preparation of persistent hydrophilic polyvinylidene fluoride flat sheet membrane:

[0042] (1) Preparation of film casting solution: polyvinyl acetate, PVP-k30, PEG-1000, potassium chloride, which are 1.5%, 5%, 4%, and 1% by mass content, are added to 70.5% N by mass content. , in N-dimethylformamide, stir at 90°C until it is completely dissolved, then add polyvinylidene fluoride with a mass content of 18%, stir at 90°C until it is completely dissolved, and let the prepared mixture stand Degassing to obtain the casting solution (the mass content in this step is the mass fraction of the corresponding components accounting for the casting solution);

[0043] (2) Preparation of durable hydrophilic polyvinylidene fluoride flat film: scrape the film on a clean glass plate with the prepared casting solution, and soak in N,N-dimethylacetamide with a mass fraction of 15% Take it out after 1 hour in the aqueous solution, and then place it in deionized water for phase inversion...

Embodiment 3

[0046] Preparation of durable hydrophilic polyvinylidene fluoride hollow fiber membranes:

[0047] (1) Preparation of casting solution: Add polyvinyl acetate, PVP-k30, and PEG-400 with a mass content of 1.5%, 5%, and 6% respectively into N,N-dimethylethyl ether with a mass content of 67.5%. In the amide, stir at 90°C until it is completely dissolved, then add polyvinylidene fluoride with a mass content of 20%, stir at 90°C until it is completely dissolved, and pressurize the prepared mixed solution to obtain the described Casting solution (the mass content in this step is the mass fraction of corresponding components accounting for the casting solution);

[0048] (2) Preparation of core liquid: add N,N-dimethylacetamide into deionized water, stir evenly to prepare a core liquid with a mass fraction of N,N-dimethylacetamide of 45%;

[0049] (3) Preparation of hydrophilic modified membrane: Extrude the prepared casting solution and core solution through a spinneret, and then im...

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Abstract

The invention discloses a preparation method of a persistently hydrophilic polyvinylidene fluoride membrane. The preparation method includes the steps: (1) casting membrane solution preparation: dissolving polyvinyl acetate and additives into solvents, adding polyvinylidene fluoride and then dissolving the polyvinylidene fluoride in the solvents to obtain casting membrane solution; (2) persistent hydrophilic polyvinylidene fluoride membrane preparation: preparing the persistent hydrophilic polyvinylidene fluoride membrane from the casting membrane solution prepared in the step (1) by a phase inversion method. The additives are compositions of one or more of polyvinylpyrrolidone, polyethylene glycol, polyvinyl alcohol, polymethyl methacrylate, lithium chloride, potassium chloride, titanium dioxide, silicon dioxide and oxidized graphene. The polyvinylidene fluoride membrane has the advantages of good and persistent hydrophily, high discharge capacity and interception rate, strong anti-pollution performance and simple preparation method.

Description

technical field [0001] The invention relates to the field of membrane materials, in particular to a preparation method and application of a durable hydrophilic polyvinylidene fluoride membrane. Background technique [0002] Water plays an extremely important role in human social life and development, but the increasing scarcity of fresh water resources and the increasing environmental pollution make wastewater treatment and reuse a very important link in the sustainable development of human society, and membrane separation technology is The most commonly used and effective water treatment technology. As a key component of membrane separation technology, membranes need to have high hydrophilicity, water flux, rejection rate, strength, chemical stability and other properties. [0003] Polyvinylidene fluoride has the advantages of good mechanical properties, weather resistance, acid and alkali corrosion resistance, chemical stability, film-forming properties, etc., so it is an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D61/00
CPCB01D61/00B01D67/0013B01D69/02B01D71/34B01D2325/36
Inventor 林振锋单永广刘春玲王红专张佳乐史乐陈峰
Owner SUZHOU SUJING NEW MATERIALS IN ENVIRONMENTAL PROTECTION
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