Polyvinylidene fluoride-hexafluoropropylene super-hydrophobic composite film and preparation method thereof

A technology of polyvinylidene fluoride and hexafluoropropylene, which is applied in the field of superhydrophobic composite membrane preparation, can solve the problems of high preparation cost, easy to form defects, insufficient mechanical strength of superhydrophobic membrane, etc., and achieve high mechanical strength, stable performance, Effect of good superhydrophobicity and self-cleaning function

Active Publication Date: 2015-01-28
JIANGSU JIUMO HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the existing technologies for preparing superhydrophobic membranes are by adding hydrophobic organic and inorganic micro-nano particles. The disadvantage is that the micro-nano particles are difficult to distribute evenly in the casting solution. Defects, the large-scale application of superhydrophobic membranes cannot be realized
At the same time, the preparation cost is relatively high, and the mechanical strength of the prepared superhydrophobic membrane is not enough to meet the actual needs.

Method used

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  • Polyvinylidene fluoride-hexafluoropropylene super-hydrophobic composite film and preparation method thereof
  • Polyvinylidene fluoride-hexafluoropropylene super-hydrophobic composite film and preparation method thereof

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preparation example Construction

[0030] A method for preparing a polyvinylidene fluoride-hexafluoropropylene superhydrophobic composite membrane according to the present invention, the composite membrane includes a non-woven fabric layer 3, a hydrophobic support layer 2 and a superhydrophobic layer 1, and the preparation steps are as follows:

[0031] 1) Dissolve the dry organic polymer in an organic solvent, add a certain amount of small molecule additives, stir and dissolve evenly at constant temperature. Let stand at room temperature for 18-24 hours for degassing to fully ripen. The organic polymer is one or more of polyvinylidene fluoride (PVDF), polysulfone (PS), polyethersulfone (PES), polyvinyl chloride (PVC), polyetherimide (PEI) ; The organic solvent is dimethylsulfoxide (DMSo), dimethylformamide (DMF), dimethylacetamide (DMAc), triethyl phosphate (TEP), N-methylpyrrolidone (NMP) One or more of them; the content of the organic polymer in the organic solvent is 10-30% (percentage by weight and volume...

Embodiment 1

[0035] The preparation method of the superhydrophobic composite membrane of the present embodiment comprises the following steps:

[0036] a. Dissolve 25 g of dry PES in 74 ml of NMP solvent, add 1 g of PEG200, and stir in a magnetic stirrer at 50°C for 8 hours. Let it stand at room temperature for 21 hours for defoaming to fully ripen it. Use a scraper with a thickness of 300 μm to evenly scrape and coat the casting solution on the surface of the non-woven fabric, leave it in the air for 5 s, and then immerse it in pure water at 22°C. After 20 s of instantaneous phase separation, fully rinse and dry at room temperature Obtained an asymmetric organic hydrophobic ultrafiltration membrane with a contact angle of 87° and a pore size of 0.08 μm;

[0037] b. Dissolve 2 g of dry PVDF-HFP in 18 ml of NMP, stir and dissolve evenly at a constant temperature of 50°C, and defoam for 24 hours. Use a scraper with a thickness of 100 μm to scrape and coat the casting solution on the surface ...

Embodiment 2

[0039] a. Dissolve 16 g of dry PS in 83 ml of NMP solvent, add 1 g of PEG600, and stir in a magnetic stirrer at 50°C for 12 hours. Let it stand at room temperature for 18 hours for defoaming to fully mature. Use a scraper with a thickness of 250 μm to evenly apply the casting solution on the surface of the non-woven fabric, leave it in the air for 5 s, and then immerse it in pure water at 22°C. After 20 s of instantaneous phase separation, fully rinse and dry at room temperature Obtained an asymmetric organic hydrophobic microfiltration membrane with a contact angle of 86° and a pore size of 0.20 μm;

[0040] b. Dissolve 1 g of dry PVDF-HFP in 19 ml of DMAc, stir and dissolve evenly at a constant temperature of 50°C, and defoam for 24 hours. Use a scraper with a thickness of 100 μm to scrape and coat the casting solution on the surface of the hydrophobic base film in step a. After staying in the air for 10 s, immerse it in an ethanol solution at 22°C. After 30 s of delayed ph...

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Abstract

The invention discloses a method for preparing a polyvinylidene fluoride-hexafluoropropylene super-hydrophobic composite film. According to the method, the surface of a non-woven fabric is respectively coated with a porous supporting layer and a super-hydrophobic layer in a blade coating manner by adopting an immersion-precipitation phase transformation method, and the size of the pore diameter of a composite film is controlled by virtue of the porous supporting layer. According to the polyvinylidene fluoride-hexafluoropropylene super-hydrophobic composite film, six fluorine atoms in the structure unit show high hydrophobic performance, and the super-hydrophobic layer is formed on the surface of the porous supporting layer by delayed phase transformation. The method is simple to operate, low in manufacture cost and easy to industrialize; the super-hydrophobic composite film has a water contact angle of 153+/-3 degrees, a rolling angle of 3+/-1 degrees and pore diameter of 0.05-2 microns, is stable in performance and high in mechanical strength, shows excellent super-hydrophobic performance and self-cleaning function, and can be used in liquid degassing, defoaming, film distillation and other industries.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic composite membrane, in particular to a method using polyvinylidene fluoride-hexafluoropropylene as a superhydrophobic material, using a microfiltration or ultrafiltration hydrophobic substrate membrane as a support layer, and using a small molecule alcohol solution A method for preparing composite membranes with superhydrophobic surfaces by delayed phase separation for coagulation baths. Background technique [0002] The high-efficiency separation membrane technology based on new materials is the key common technology to solve the energy and environmental problems that our country is currently facing, and it is also one of the high-tech technologies that are increasingly valued internationally. In recent years, hydrophobic membranes have attracted the attention of researchers in the fields of membrane distillation, liquid degassing, defoaming, and self-cleaning. Hydrophobic membranes a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/68B01D71/30B01D71/64B01D69/12B01D67/00
Inventor 丁晓斌孙雪飞张益慧
Owner JIANGSU JIUMO HIGH TECH CO LTD
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