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Polyvinylidene fluoride microporous film and preparation method

A polyvinylidene fluoride, microporous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as insufficient hydrophobicity of membrane surface

Inactive Publication Date: 2010-01-27
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a polyvinylidene fluoride microporous membrane and its preparation method, which can solve the problem of insufficient hydrophobicity of the membrane surface in the process of membrane distillation, that is, on the basis of the existing immersion gel method to prepare the membrane, use template auxiliary phase Membrane preparation by conversion method to improve the hydrophobicity of PVDF membrane surface

Method used

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  • Polyvinylidene fluoride microporous film and preparation method
  • Polyvinylidene fluoride microporous film and preparation method
  • Polyvinylidene fluoride microporous film and preparation method

Examples

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Embodiment 1

[0029] 1) Prepare a total of 100g of casting solution, first mix PVDF (13wt%), octanol (6wt%) and DMAc (81wt%), place it in a jar, and then put it in an electric oven at 70°C for 48 hours , to completely dissolve the polymer. Shake well and filter, let stand to defoam and mature fully for 24 hours.

[0030] 2) Stick clean water-resistant sandpaper (1000 mesh) on the glass plate with double-sided tape;

[0031] 3) Evenly scrape the casting solution with a temperature of 35°C on the water-resistant sandpaper of the glass plate, and place it in the air with a relative humidity of 40% for 1 min.

[0032] 4) The glass plate is immersed in a coagulation bath (water) at 35° C. for 2 to 3 hours, and the gel is solidified to form a film.

[0033] 5) Heat-treat the formed membrane in deionized water at 50°C for 15 minutes, then soak it in deionized water for 9 days, change the water frequently (twice a day), and then soak it in absolute ethanol for 24 hours to obtain highly hydrophobi...

Embodiment 2

[0035] 1) The total amount of casting liquid is 100g. First, PVDF (10wt%), octanol (10wt%) and DMAc (80wt%) are mixed, placed in a jar, and then placed in a 70°C electric oven for 48 hours. Allow the polymer to dissolve completely. Shake well and filter, let stand to defoam and mature fully for 24 hours.

[0036] 2) Stick clean water-resistant sandpaper (1200 mesh) on the glass plate with double-sided tape;

[0037] 3) Evenly scrape the casting solution at a temperature of 35°C on the water-resistant sandpaper of the glass plate, and place it in the air with a relative humidity of 50% for 1 min.

[0038]4) The glass plate is immersed in a coagulation bath (water) at 35° C. for 2 to 3 hours, and the gel is solidified to form a film.

[0039] 5) Heat-treat the formed membrane in deionized water at 50°C for 15 minutes, then soak it in deionized water for 8 days, change the water frequently (twice a day), and then soak it in absolute ethanol for 24 hours to obtain highly hydroph...

Embodiment 3

[0042] 1) The total amount of casting solution is 100g. First, PVDF (15wt%), octanol (10wt%) and DMAc (75wt%) are mixed, placed in a jar, and then placed in a 70°C electric oven for 48 hours. Allow the polymer to dissolve completely. Shake well and filter, let stand to defoam and mature fully for 24 hours.

[0043] 2) Stick clean water-resistant sandpaper (1500 mesh) on the glass plate with double-sided tape;

[0044] 3) Evenly scrape the casting solution at a temperature of 35°C on the water-resistant sandpaper of the glass plate, and place it in the air with a relative humidity of 70% for 1 min.

[0045] 4) The glass plate is immersed in a coagulation bath (water) at 35° C. for 2 to 3 hours, and the gel is solidified to form a film.

[0046] 5) Heat-treat the formed film in deionized water at 60°C for 15 minutes, then soak it in deionized water for 6 days, change the water frequently, and then soak it in absolute ethanol for 24 hours to obtain highly hydrophobic polyvinyli...

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Abstract

The invention provides a polyvinylidene fluoride microporous film and a preparation method; the polyvinylidene fluoride microporous film is prepared by using polyvinylidene fluoride, fatty alcohol (non solvent) and polar organic solvent as raw materials, the proportioning of which is as follows: the mass content of polyvinylidene fluoride is 10%-15%, and the content of non solvent is 6-12%; the specific steps are as follows: polyvinylidene fluoride, polar organic solvent and non solvent are mixed, dissolved and filtered, set aside and are deaerated to obtain clear casting film liquid which is struck on a coarse structure template substrate and placed in air; gel forms film in a coagulating bath, is processed by hot water, and then soaked in water and absolute ethyl alcohol to obtain high hydrophobic polyvinylidene fluoride microporous film; the contact angle between the surface of high hydrophobic polyvinylidene fluoride microporous film and water reaches 130 degrees to 140 degrees, air flux of the film reaches 6.0m<3> / (m<2>-h-kPa) under 60kPa, the maximum bore diameter is less than 0.5 mum, tensile strength reaches breaking strength which is larger than 5Mpa, and the elongation at break is larger than 50%. The invention is the polyvinylidene fluoride microporous film with high hydrophobicity, high flux and good mechanical strength and the preparation method, which is mainly applied to the film distillation and associated film process.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride microporous membrane and a preparation method thereof, in particular to a polyvinylidene fluoride microporous membrane with high hydrophobicity, large flux and good mechanical strength, which is mainly used in membrane distillation and related membrane processes. Background technique [0002] Membrane preparation research is the forerunner of the development and application of membranes and membrane processes. Polymer porous membranes are widely used in membrane separation processes such as microfiltration and ultrafiltration, and are used as supporting materials for various composite membranes (such as gas separation, pervaporation, etc.) , is the most important membrane species. [0003] Membrane absorption, membrane desorption and membrane distillation processes using hydrophobic polymer microporous membranes have very broad application prospects. Keeping the membrane from being wetted in long-term...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/06B01D67/00
Inventor 王志英杨振生李春利
Owner HEBEI UNIV OF TECH
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