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Superhydrophobic porous film and its preparation method and application

A porous membrane, super-hydrophobic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as inability to cope with membrane distillation scaling and fouling, membrane distillation scaling problems, and cost increases. , to achieve the effect of increasing flux, easy mass production, and improving hydrophobic performance

Inactive Publication Date: 2020-07-31
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these materials are still unable to deal with the fouling problem in the membrane distillation process in the treatment of high-salt wastewater.
Therefore, the traditional hydrophobic membrane is still unable to deal with the fouling and fouling problems in the membrane distillation process. Although the chemical fluorination modification has improved its anti-fouling and fouling performance to a certain extent, the cost has increased significantly and mass production is difficult.

Method used

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  • Superhydrophobic porous film and its preparation method and application
  • Superhydrophobic porous film and its preparation method and application

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preparation example Construction

[0040] 4. Preparation of superhydrophobic porous membrane

[0041] Pour the prepared casting solution on the prepared soft template, and use a scraper of a specific size to scrape the film; put the scraped casting solution and soft template into a water bath at a specific temperature, and control the temperature of the environment. Temperature and humidity, through phase separation to form a film; then the formed film material is peeled off to obtain a porous film material with a super-hydrophobic surface; finally, ethanol is used as a cleaning agent for ultrasonic cleaning, and after drying, the surface with micro-columns / Superhydrophobic porous membrane materials with cone array structure.

[0042] In the above process, the specific size of the scraper refers to a scraper with a thickness of 50-500 μm. The water bath temperature is controlled to be 5-90°C; the ambient temperature is 10-40°C, and the humidity is 10-90%, preferably the water bath temperature is 20-75°C, the...

Embodiment 1

[0047] The micromolded polyvinylidene fluoride (PVDF) hydrophobic membrane of the present invention has a secondary structure such as figure 2 As shown, the polyvinylidene fluoride body is a primary structure with a three-dimensional pore-like structure, and the pores are uniform and interconnected. The secondary structure also has the same primary three-dimensional porous structure as the original primary structure, with an effective porosity of 0.7.

[0048] The preparation method of the micromolded polyvinylidene fluoride (PVDF) hydrophobic membrane is as follows:

[0049] (1) Select a smooth and flat silicon plate with a cylinder array with a height of 10 μm, an equivalent diameter of 5 μm, and a cylinder center distance of 10 μm on the surface.

[0050] (2) Mix polydimethylsiloxane (PDMS) and curing agent in a ratio of 10:1, let the mixed solution stand still for degassing for 10 minutes, slowly pour the degassed PDMS mixed solution on the silicon plate, and put the who...

Embodiment 2

[0055] The micromolded polyethersulfone (PES) hydrophobic membrane of the present invention has a secondary structure, wherein the polyethersulfone body is a primary structure with a three-dimensional porous structure, and the pores are uniform and interpenetrating. On the upper surface of sulfone, there is a secondary structure with uniform arrangement and uniform size. This secondary structure also has the same primary three-dimensional porous structure as the original primary structure, with an effective porosity of 0.65.

[0056] The preparation method of this micromolded polyethersulfone (PES) hydrophobic membrane is as follows:

[0057] (1) Select a smooth and flat silicon plate with a pyramid array with a height of 10 μm, an equivalent diameter of 5 μm, and a square pyramid center distance of 10 μm on the surface.

[0058](2) Use epoxy resin, mix the curing agent at a ratio of 10:1, let the mixture stand still for degassing for 10 minutes, slowly pour the degassed epoxy...

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Abstract

The invention discloses a super-hydrophobic porous membrane as well as a preparation method thereof. A micro molding technology and a phase separation technology are combined, a membrane scraping bottom plate on which a membrane casting solution is scraped is placed in a water bath at the preset temperature for phase separation membrane formation, a formed membrane material is stripped, and the super-hydrophobic porous membrane is obtained. The membrane scraping bottom plate is a grooved soft template produced with a reverse mold process, the super-hydrophobic porous membrane produced throughthe grooved soft template comprises micron-size surface bulges which are consistent in size and arranged regularly, and the distance between adjacent surface bulges is micron-sized. The surface morphology of the membrane material is reconstructed, the super-hydrophobic porous membrane with multiple scales is prepared while additional modifiers are not added, and the super-hydrophobic porous membrane can be applied to a membrane distillation technology, has the advantages of high hydrophobicity, pollution resistance, wetting resistance and the like and thus has high salt resistance, and a novelmembrane production technology is provided for industrialization of membrane distillation and is low in cost and prone to mass production.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a super-hydrophobic porous membrane and its preparation method and application. Background technique [0002] Water resources and environmental problems have become more and more urgent problems to be solved in the world. In the process of industrialization and urbanization, a large amount of domestic and production wastewater has been generated. The recycling of waste water is of great significance to solve environmental pollution and urban water shortage. Membrane distillation technology (MD) is a separation process that uses hydrophobic membrane materials as the separation medium and saturated vapor pressure difference as the driving force. It is a membrane process that can use low-level heat energy for material liquid concentration and water reuse. At present, membrane distillation technology mostly uses hydrophobic membrane materials, such as PP, PVDF, PTFE a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/34B01D71/42B01D71/44B01D71/64B01D71/68B01D61/36
CPCB01D61/364B01D67/0009B01D71/34B01D71/42B01D71/44B01D71/64B01D71/68
Inventor 何涛郑瑞宋健峰陈颖肖泽纯刘勇捷王瑾
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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