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Polyvinylidene fluoride anti-pollution membrane and preparation method thereof

A technology of polyvinylidene fluoride film and polyvinylidene fluoride, which is applied in the field of environmental functional film materials, can solve the problems of poor pollution resistance and insufficient modification degree of polyvinylidene fluoride, and achieve low requirements for preparation equipment and anti-pollution Strong ability and good filtration performance

Active Publication Date: 2017-09-12
天津鼎芯膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the existing polyvinylidene fluoride (PVDF) membrane hole functional modification degree is not enough, there is a problem of poor pollution resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of Tris-HCl buffer solution: Dissolve 0.1815 g of Tris-HCl in 300 mL of distilled water, and adjust the pH to 8.5 with hydrochloric acid to obtain a Tris-HCl buffer solution;

[0025] (2) Dopamine-modified PVDF powder: under continuous magnetic stirring at room temperature, quickly add 0.3g dopamine hydrochloride, 6.0g PVDF powder and 10mL absolute ethanol to the Tris-HCl buffer solution obtained in step (1), and magnetically stir at 25°C After 6-24 hours, filter, wash the obtained solid with deionized water, and then place the product in a vacuum dryer at 40°C to dry to constant weight, that is, dopamine-modified PVDF powder;

[0026] (3) disperse 6.0g of dopamine-modified polyvinylidene fluoride powder obtained in step (2), 0.4g of polyvinylpyrrolidone (PVP) in 13.2g of N,N-dimethylformamide (DMF) or N-formaldehyde In NMP or N, N-dimethylacetamide (DMAC), stir magnetically at 50-70°C for 2-6 hours to form a uniform casting solution. After vacuum degass...

Embodiment 2

[0029] (1) with embodiment 1;

[0030] (2) with embodiment 1;

[0031] (3) with embodiment 1;

[0032](4) Soak the dopamine-modified PVDF membrane obtained in step (3) in 100mL of 0.3mol / L H 3 BO 3 in aqueous solution for 2min, and then transferred to 110mL of newly prepared pH 3.87 ammonium fluotitanate and boric acid (0.1mol / L (NH 4 ) 2 TiF 6 +0.3mol / L H 3 BO 3 ) in a mixed aqueous solution at room temperature for 45 minutes, and the prepared membrane was fully washed in deionized water to obtain the PVDF anti-fouling membrane.

Embodiment 3

[0034] (1) with embodiment 1;

[0035] (2) with embodiment 1;

[0036] (3) with embodiment 1;

[0037] (4) Soak the dopamine-modified PVDF membrane obtained in step (3) in 100mL of 0.3mol / L H 3 BO 3 in aqueous solution for 2 min, and then transferred to 110 mL of freshly prepared pH 3.87 ammonium fluorotitanate and boric acid (0.1 mol / L (NH 4 ) 2 TiF 6 +0.3mol / L H 3 BO 3 ) in a mixed aqueous solution, continue to soak for 15 minutes at room temperature, and then fully wash the prepared membrane in deionized water to obtain the PVDF anti-fouling membrane.

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Abstract

The invention discloses a polyvinylidene fluoride anti-pollution membrane and a preparation method thereof, and belongs to the field of environmental functional membrane materials. The preparation method comprises: (1) self-polymerizing dopamine on the surface of polyvinylidene fluoride powder, and adhering the generated poly dopamine functional layer onto the surface of the polyvinylidene fluoride powder; (2) preparing a poly dopamine modified polyvinylidene fluoride membrane by using a phase conversion method; and (3) depositing a nano-TiO2 functional layer on the membrane prepared in the step (2) through a liquid phase deposition method to prepare the polyvinylidene fluoride anti-pollution membrane. According to the present invention, by combining the strong adhesion and the polyfunctional group of poly dopamine, the ultraviolet resistance and stable chemical performance of polyvinylidene fluoride, and the advantages of hydrophilicity, high photocatalytic activity and the like of nano-TiO2, the polyvinylidene fluoride anti-pollution membrane is developed; and the prepared polyvinylidene fluoride anti-pollution membrane has excellent pollution resistance, and can be used in various membrane separation fields.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride anti-pollution film and a preparation method thereof, specifically, modifying polyvinylidene fluoride (PVDF) powder with dopamine (PDA) and then depositing nanometer TiO 2 The obtained polyvinylidene fluoride membrane with anti-pollution function belongs to the field of environmental functional membrane materials. Background technique [0002] Polyvinylidene fluoride (PVDF) has excellent anti-ultraviolet and aging resistance, and has good chemical stability. It is not corroded by acids and alkalis at room temperature. It also has excellent thermal stability and mechanical strength. membrane material. At present, PVDF membrane has been widely used in the field of water treatment, but its inherent strong hydrophobicity makes it extremely easy to be polluted, resulting in decreased membrane flux, shortened membrane life, and increased filtration costs. [0003] Nano-TiO 2 It has high chemical stability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/06B01D67/00
CPCB01D67/0002B01D69/06B01D71/024B01D71/34B01D71/60B01D2323/12B01D2323/18
Inventor 陈熙马胜奎董华琳赵博武袁千玄陈莉
Owner 天津鼎芯膜科技有限公司
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