Preparation method of hydrophilic poly(vinylidene fluoride) microfiltration membrane

A polyvinylidene fluoride, microfiltration membrane technology, applied in chemical instruments and methods, membranes, ultrafiltration, etc., can solve the problems of weak interaction between PDA particles and PVDF, long operation process, long modification period, etc. Improve hydrophilicity and its preparation efficiency, improve preparation efficiency, and solve the effect of long operation cycle

Active Publication Date: 2018-11-30
杭州安诺过滤器材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heterogeneous interaction between PDA particles and PVDF solution is difficult to completely modify PVDF, and the interaction between PDA particles and PVDF is weak, and there will be the influence of PDA particle desorption during the filtration process.
[0009] To sum up, in order to realize the industrialized production and application of polydopamine-coated modified PVDF, it is urgent to solve the current problems of polydopamine-coated modified PVDF, such as lengthy operation process, long modification period, and unstable modification effect.

Method used

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  • Preparation method of hydrophilic poly(vinylidene fluoride) microfiltration membrane
  • Preparation method of hydrophilic poly(vinylidene fluoride) microfiltration membrane
  • Preparation method of hydrophilic poly(vinylidene fluoride) microfiltration membrane

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Embodiment 1

[0034] (1) Add 5g of PVDF powder to 50ml of N,N-dimethylacetamide, heat up to 60°C and stir until completely dissolved, then add 0.2g of dopamine hydrochloride, 0.1g of potassium thiosulfate and 0.5g of potassium carbonate to fully Stir and keep at 60°C for 6 hours to obtain a polydopamine-modified PVDF solution;

[0035](2) Dissolve 1g of polyvinyl alcohol 1788 in 5ml of water, and slowly drop into 50g of the polydopamine-modified PVDF solution prepared in step (1) after it is fully dissolved, and react at 60°C for 6h, then centrifugally filter and take The supernatant was slowly dropped into pure water at 30°C to precipitate, stirred and washed for 2 hours, washed repeatedly for 3 times, then dried in an oven at 60°C to obtain secondary hydrophilic modified PVDF powder;

[0036] (3) in the N of 40ml, N-dimethylacetamide, add the secondary hydrophilic modification PVDF powder that makes in 5g step (2), 1g PEG600, 1.5g polypyrrolidone and 0.2g lithium chloride, in Stir at 30°...

Embodiment 2

[0042] (1) Add 8g of PVDF powder to 40ml of nitrogen-methylpyrrolidone, heat up to 60°C and stir until completely dissolved, then add 0.3g of L-dopamine, 0.15g of potassium permanganate and 0.6g of potassium carbonate for full stirring, and keep at 60°C React for 6 hours to obtain a poly-L-dopamine-modified PVDF solution;

[0043] (2) 1g polyethyleneimine (molecular weight is 30000) is dissolved in the nitrogen methyl pyrrolidone of 5ml, after it is fully dissolved, slowly drip in the poly-levodopamine modified PVDF solution that 50g step (1) makes, After reacting at 60°C for 6 hours, the supernatant was collected by centrifugal filtration and slowly dropped into pure water at 30°C to precipitate, stirred and washed for 2 hours, washed repeatedly for 3 times, then dried in an oven at 60°C to obtain secondary hydrophilic modified PVDF powder;

[0044] (3) Add 5 g of secondary hydrophilic modified PVDF powder, 1 g of PEG600, 1.5 g of polypyrrolidone and 0.2 g of lithium chlorid...

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Abstract

The invention discloses a preparation method of a hydrophilic poly(vinylidene fluoride) microfiltration membrane. A heterogeneous modification process of conventional polydopamine-modified PVDF is promoted to a homogeneous process, and in the process of homogeneous polymerization of dopamine, polydopamine molecules combine with PVDF molecular chains through strong non-covalent bonds; and then water-soluble polymer is introduced to chemically react with polydopamine so as to obtain a raw material of the hydrophilic PVDF, finally the raw material of the hydrophilic PVDF is redissolved, and a pore-forming agent and additive are added so as to obtain the microporous membrane. Through the method, the efficiency of hydrophilic modification is improved, the obtained hydrophilic PVDF microfiltration membrane has excellent hydrophilicity, the long-term stability and chemical stability of a hydrophilic coating on the PVDF microfiltration membrane are improved remarkably, the problems of a long operation period of the polydopamine-modified PVDF microfiltration membrane, desorption of the polydopamine coating after long-term use is conducted and the like are solved, and the preparation efficiency of the hydrophilized PVDF microfiltration membrane is improved greatly.

Description

technical field [0001] The invention belongs to the field of polymer membrane materials, in particular to a method for preparing a hydrophilic polyvinylidene fluoride microfiltration membrane Background technique [0002] Polyvinylidene fluoride (PVDF) is widely used in the filtration and separation industry due to its good mechanical properties, excellent chemical stability and good film-forming properties. However, the low surface energy of PVDF makes it highly hydrophobic , resulting in low processing capacity and serious membrane fouling when PVDF membrane materials filter aqueous media, which limits its application to a certain extent. [0003] In order to effectively improve the hydrophilicity of PVDF membrane materials, researchers at home and abroad have made corresponding research. CN101269302 B and US 4810384 A adopt PVDF and hydrophilic high polymer (sulfonated polysulfone, polyethersulfone, cellulose acetate) intermolecular cross-linking and blending to prepare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D61/14
CPCB01D61/147B01D67/0006B01D71/34B01D2325/36
Inventor 何美锋黄金钟
Owner 杭州安诺过滤器材有限公司
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