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Temperature-sensitive self-cleaning polyvinylidene fluoride film and preparation method thereof

A technology of polyvinylidene fluoride film and polyvinylidene fluoride, which is applied in the field of temperature-sensitive self-cleaning polyvinylidene fluoride film and its preparation, can solve the problems of limited practical application of titanium dioxide modified film and responsive film, poor control effect, Low anti-biological pollution performance and other problems, to achieve good self-cleaning anti-pollution performance, easy operation, good self-cleaning effect

Inactive Publication Date: 2013-07-03
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Grafting polymer monomers to the surface of the membrane, less grafting in the membrane pores, insensitive to conditions, poor control of membrane flux, low anti-biofouling performance, limiting titanium dioxide modified membranes and responsiveness Practical Applications of Membranes

Method used

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  • Temperature-sensitive self-cleaning polyvinylidene fluoride film and preparation method thereof
  • Temperature-sensitive self-cleaning polyvinylidene fluoride film and preparation method thereof
  • Temperature-sensitive self-cleaning polyvinylidene fluoride film and preparation method thereof

Examples

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preparation example Construction

[0024] The preparation method of the temperature-sensitive self-cleaning polyvinylidene fluoride membrane of the present invention comprises the following processes:

[0025] (1) Preparation of titanium dioxide / silane coupling agent MPS (γ-(methacryloyloxy)propyltrimethoxysilane) nanoparticles Add the silane coupling agent MPS, deionized water and ammonia water to the ethanol dispersion solution of titanium dioxide In the process, white titanium dioxide / silane coupling agent MPS nanoparticles were obtained by pulverization after ultrasonication, mechanical stirring, centrifugation and vacuum drying.

[0026] (2) Preparation of titanium dioxide / N-isopropylacrylamide nanoparticles

[0027] Add titanium dioxide / silane coupling agent MPS nanoparticles and initiator into a 100ml three-necked flask that has been added with ethanol, stir and react at 70-75°C under nitrogen protection for 24-48 hours, centrifuge and vacuum dry, pulverize and disperse , to obtain white titanium dioxid...

Embodiment 1

[0032] 1) Preparation of titanium dioxide / silane coupling agent MPS nanoparticles

[0033] Add 0.62g of silane coupling agent MPS, 1.3ml of deionized water and 0.68g of ammonia water (25wt%) into 25ml of ethanol titanium dioxide dispersion solution containing 1g of titanium dioxide ultrasonically for 0.5h, then ultrasonically for 1h, mechanically stirred (500rpm, 48h , room temperature), centrifugation and vacuum drying to obtain white titanium dioxide / silane coupling agent MPS nanoparticles.

[0034] 2) Preparation of titanium dioxide / N-isopropylacrylamide nanoparticles

[0035] Add 0.15g of titanium dioxide / silane coupling agent MPS nanoparticles and 0.3g of azobisisobutylcyanide into a 100ml three-neck flask to which 5ml of ethanol has been added, stir and react at 75°C under nitrogen protection for 24 hours, and centrifuge Vacuum-dried, pulverized and dispersed to obtain white titanium dioxide / N-isopropylacrylamide nanoparticles.

[0036] 3) Preparation of temperature-se...

Embodiment 2

[0040] 1) Preparation of titanium dioxide / silane coupling agent MPS nanoparticles: same as Step 1 of Example 1.

[0041] 2) Preparation of titanium dioxide / N-isopropylacrylamide nanoparticles: same as Step 2 of Example 1.

[0042] 3) Preparation of temperature-sensitive self-cleaning polyvinylidene fluoride membrane

[0043] Add 2 g of polyvinylidene fluoride powder, 0.2857 g of titanium dioxide / N-isopropylacrylamide nanoparticles and 0.2 g of pore-forming agent PVP into a round-bottomed flask containing 12 ml of dimethylacetamide to form a titanium dioxide / N- The blended film with the mass fraction of isopropylacrylamide nanoparticles being 2% was stirred evenly at 70°C for 48 hours; the solution was cooled, defoamed, and the film was scraped, and the coagulation bath was composed of deionized water at a temperature of 20°C; Titanium dioxide / N-isopropylacrylamide nanoparticles / polyvinylidene fluoride blend film was obtained after washing with ion water and natural drying.

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Abstract

The invention discloses a temperature-sensitive self-cleaning polyvinylidene fluoride film and a preparation method thereof. The preparation method comprises the steps of taking polyvinylidene fluoride, titanium dioxide and N-isopropyl acrylamide as main materials to prepare the titanium dioxide / N-isopropyl acrylamide nanoparticle / polyvinylidene fluoride blend film. The preparation method is simple in process and easy for operation and popularization, and does not need an expensive instrument; and the prepared temperature-sensitive self-cleaning polyvinylidene fluoride film is good in temperature response performance and self-cleaning property, and has a wide potential application value in the fields of intelligent devices, water treatment, biochemical engineering and the like.

Description

technical field [0001] The invention belongs to the field of material preparation and polymer modification, and in particular relates to a temperature-sensitive self-cleaning polyvinylidene fluoride film and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a commonly used polymer membrane material with good mechanical properties, thermal stability and chemical stability. However, the nature of hydrophobicity makes PVDF membranes easy to be polluted, and membrane fouling severely limits the application of PVDF membranes in many fields, such as ultrafiltration, microfiltration, and so on. [0003] Optimizing the operating environment of the membrane or functional modification of the membrane are effective ways to control PVDF membrane fouling. It has been proved that the responsive modification of membrane blending is a simple and feasible method. Inorganic-organic composite materials are more and more widely used in PVDF membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00
Inventor 张其清周青李建华邵喜胜闫邦峰
Owner FUZHOU UNIV
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