Preparation method of lasting hydrophilization modified polyvinylidene fluoride (PVDF) ultrafiltration membrane

A technology of polyvinylidene fluoride and hydrophilization, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of unsatisfactory anti-pollution effect, prone to swelling, even dissolution and destruction of membrane structure, etc. question

Inactive Publication Date: 2013-12-25
四川有色环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 2. Research status of existing technologies at home and abroad
However, many studies have shown that in PVDF/PVA blended composite membranes, since PVA is a polymer with a large number of strong hydrophilic hydroxyl groups, the stability of the formed membrane is poor, and it is easy to swell or even d

Method used

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  • Preparation method of lasting hydrophilization modified polyvinylidene fluoride (PVDF) ultrafiltration membrane
  • Preparation method of lasting hydrophilization modified polyvinylidene fluoride (PVDF) ultrafiltration membrane
  • Preparation method of lasting hydrophilization modified polyvinylidene fluoride (PVDF) ultrafiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: A kind of preparation method of durable hydrophilic modified polyvinylidene fluoride ultrafiltration membrane, the preparation method comprises the following steps:

[0034] 1) Preparation of casting solution:

[0035] Dry the PVDF powder and PVA powder under vacuum conditions, choose DMAC as the solvent, dissolve the PVA powder in the solvent and heat up, stir until completely dissolved, after cooling down, add PVDF and anhydrous FeCl 3 Powder and stir, keep the temperature constant, let the casting solution stand for defoaming, and scrape the film for later use;

[0036] 2) Preparation of cross-linked blend membrane:

[0037] Use the gel immersion precipitation phase inversion method to make the film, use hydrochloric acid aqueous solution as the coagulation bath, adjust the pH of the coagulation bath to 2, prepare a smooth, flat and dry glass plate, pour an appropriate amount of casting liquid on the glass plate, and quickly scrape the film with a self...

Embodiment 2

[0038] Example 2: In step 1), the PVDF powder and PVA powder are dried under vacuum for 48 hours, and the rest of the steps are the same as in Example 1, so they will not be repeated here.

Embodiment 3

[0039] Example 3: In step 1), dissolve the PVA powder in the solvent and raise the temperature step by step, and stir at 80-90°C until it is completely dissolved. The rest of the steps are the same as in Example 1, so they will not be repeated here.

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Abstract

The invention discloses a preparation method of a lasting hydrophilization modified polyvinylidene fluoride (PVDF) ultrafiltration membrane. The preparation method of the lasting hydrophilization modified PVDF ultrafiltration membrane comprises the following steps: 1) preparing a film casting solution; 2) preparing a crosslinked blend membrane. After liquid phase blending modification is carried out on PVDF and an organic hydrophilic macromolecule PVA (polyvinyl alcohol), further anhydrous ferric chloride is added into the film casting solution, and PVA is fixed through a complexing reaction carried out on a hydroxyl on a molecular chain of the PVA and Fe<3+>, so that lasting hydrophilic modification of a membrane is realized, and water permeability stability is improved while a membrane structure is optimized; after modification, performances of the membrane are shown as follows: a contact angle is reduced by 30-40 degrees, flux is increased by 1-3 times compared with the flux before modification, and strength is increased by 1-1.5MPa; the anti-pollution capacity of the membrane is shown as follows: after filtering is carried out for 2 hours, the recovery rate of the flux of the membrane is increased by 10-20%, and the attenuation rate of the flux of the membrane is reduced by 5-10%.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of a persistently hydrophilized modified polyvinylidene fluoride ultrafiltration membrane. Background technique [0002] China's per capita fresh water resources are only 2300m 3 , is one of the 13 countries with the poorest per capita water resources in the world. Under the severe situation of increasing depletion of water resources and environmental pollution, the recycling of urban sewage will become a very important link to promote the sustainable development and utilization of urban water resources. [0003] Polyvinylidene fluoride (PVDF) ultrafiltration membranes are widely used in urban sewage treatment due to their excellent mechanical properties, chemical stability and thermal stability. However, membrane fouling caused by strong hydrophobicity limits its promotion. Studies have reported that regardless of the nature of the organic matter, the adsorption rat...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00C02F1/44
Inventor 蒋加洪白娟莉薛兴福
Owner 四川有色环境科技有限公司
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