Single-sided super-hydrophobic polymer fiber membrane and preparation method and application thereof

A hydrophobic polymer and polymer technology, which is applied in the field of membrane flue gas desulfurization, can solve the problems that the membrane contactor cannot operate stably for a long time, affects the membrane absorption flux, membrane wetting of the membrane contactor, etc., and achieves simple and reliable preparation steps. control, excellent desulfurization performance, and the effect of avoiding membrane wetting

Active Publication Date: 2020-07-10
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In actual operation, the continuous operation of the membrane contactor will cause membrane wetting in the membrane contactor
Since the mass transfer rate of gas in liquid is lower than that in gas, when the membrane is wetted, the mass transfer resistance increases and the mass transfer coefficient decreases, which in turn affects the absorption flux of the membrane.
Therefore, the membrane wetting phenomenon makes the membrane contactor unable to operate stably for a long time

Method used

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  • Single-sided super-hydrophobic polymer fiber membrane and preparation method and application thereof
  • Single-sided super-hydrophobic polymer fiber membrane and preparation method and application thereof
  • Single-sided super-hydrophobic polymer fiber membrane and preparation method and application thereof

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preparation example Construction

[0028] The invention provides a method for preparing a single-sided superhydrophobic polymer fiber membrane, comprising the following steps:

[0029] mixing the hydrophobic polymer, the hydrophobic nanoparticles, the first solvent and the second solvent to obtain a spinning solution;

[0030] Electrospinning the spinning solution on one side of the polymer base film to form a superhydrophobic fiber layer on one side of the polymer base film to obtain a single-side superhydrophobic polymer fiber film;

[0031] The boiling point difference between the first solvent and the second solvent is greater than or equal to 50° C., and the boiling point of the first solvent is lower than that of the second solvent.

[0032] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0033] In the invention, the hydrophobic polymer, the hydrophobic nano particles, the first solvent ...

Embodiment 1

[0048] The superhydrophobic fiber layer of the single-sided superhydrophobic polyvinylidene fluoride fiber membrane is formed by electrostatic spinning of hydrophobic nano silicon dioxide (with a particle diameter of 20-40nm) and polyvinylidene fluoride.

[0049] The preparation method is as follows:

[0050] (1) Soak a commercially available polyvinylidene fluoride film in absolute ethanol solution at 25°C for 2 hours, take it out and dry it naturally, and dry it under vacuum for 24 hours to obtain a polyvinylidene fluoride-based film;

[0051] (2) Preparation of hydrophobic nano-silica-polyvinylidene fluoride spinning solution, the composition of the spinning solution is: polyvinylidene fluoride (1.6g), N,N-dimethylformamide (5.04g, boiling point 152 ℃), N-methylpyrrolidone (3.36g, boiling point 205 ℃), hydrophobic nano-silica accounts for 10% of the mass of polyvinylidene fluoride;

[0052] The preparation method of the spinning solution: Add 0.16g of hydrophobic nano-sili...

Embodiment 2

[0062] The difference from Example 1 is that the hydrophobic nano silicon dioxide accounts for 20% of the mass of polyvinylidene fluoride.

[0063] Performance Testing

[0064] 1) Observe the obtained single-sided superhydrophobic polyvinylidene fluoride fiber membrane using a scanning electron microscope, the obtained results are as follows figure 2 As shown, the upper right corner of the figure is a detailed picture. According to the SEM image, it can be seen that strip-like protrusions appear on the surface of the film, and higher point-like protrusions appear on the surface of the strip-like protrusions, and the surface of the fiber is exposed to SiO 2 content increased.

[0065] 2) Test the water contact angle of the single-sided superhydrophobic polyvinylidene fluoride film obtained, wherein the side with the fiber layer is called the hydrophobic modified side, and the other side is called the unmodified side, and the results are shown in Table 2;

[0066] 3) Accordin...

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Abstract

The invention provides a single-sided super-hydrophobic polymer fiber membrane and a preparation method and application thereof, and belongs to the technical field of flue gas desulfurization by a membrane method. Hydrophobic nanoparticles are introduced into a spinning solution; meanwhile, sub-micron bulges are constructed on the surface of the fiber by utilizing different boiling points and different volatilization rates of double solvents; the submicron bulges and the nano hydrophobic particles play a synergistic role to construct a lotus leaf-like hydrophobic fiber layer with a micro-nanodual coarse structure, and one side of the prepared single-sided super-hydrophobic polymer fiber membrane, which is provided with the super-hydrophobic fiber layer, has excellent hydrophobicity. In the long-term desulfurization process, the single-sided super-hydrophobic polymer fiber membrane has relatively high desulfurization performance, and particularly, compared with an original membrane, the single-sided super-hydrophobic polymer fiber membrane is relatively good in desulfurization performance and relatively good in stability.

Description

technical field [0001] The invention relates to the technical field of membrane flue gas desulfurization, in particular to a single-sided superhydrophobic polymer fiber membrane and its preparation method and application. Background technique [0002] While coal combustion produces sulfur dioxide, it also produces secondary pollutants, including sulfate, organic sulfate aerosols, and acid rain. Therefore, desulfurization has become a widely concerned issue. [0003] The more mainstream desulfurization methods at this stage include wet desulfurization, dry desulfurization and semi-dry desulfurization. Among them, wet desulfurization is the most widely used and the highest desulfurization rate. However, it has problems such as high cost, large floor area, and prone to atomization and flooding during the desulfurization process. As a new type of desulfurization technology, membrane desulfurization has attracted widespread attention. Its modular operation, small size, and low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/64B01D71/42B01D71/34B01D71/30B01D71/28B01D71/26B01D69/02B01D67/00B01D53/22
CPCB01D53/228B01D67/0002B01D69/02B01D71/26B01D71/28B01D71/30B01D71/34B01D71/42B01D71/64B01D71/68B01D2257/302B01D2258/0283B01D2323/39B01D2325/38
Inventor 张玉忠李旭粱晴晴辛清萍李泓
Owner TIANJIN POLYTECHNIC UNIV
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