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Preparation method of three-dimensional hydrophobic tubular nanofiber membrane

A nanofiber membrane and hydrophobic nanotechnology, which is applied in the field of preparation of three-dimensional hydrophobic tubular nanofiber membranes, can solve the problems of complex fabrication process of hydrophobic membranes, poor mechanical properties of hydrophobic membranes, and low self-supporting ability, so as to improve the anti-wetting effect , High hydrophobic performance, high self-supporting ability

Active Publication Date: 2020-04-10
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of traditional hydrophobic membranes is complicated and the cost of use is high, and the general method of manufacturing hydrophobic membranes is mainly to modify the two-dimensional hydrophobic layer by using low surface energy materials or by increasing the surface roughness.
However, during the long-term wetting process, the air at the water-air-solid interface disappears, resulting in complete wetting of the surface, which makes these films significantly less hydrophobic.
In addition, traditional hydrophobic membranes have poor mechanical properties and low self-supporting ability.

Method used

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  • Preparation method of three-dimensional hydrophobic tubular nanofiber membrane
  • Preparation method of three-dimensional hydrophobic tubular nanofiber membrane
  • Preparation method of three-dimensional hydrophobic tubular nanofiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) In terms of mass fraction, the formula of the first casting solution is: 13% of polyvinyl chloride, 52.2% of N,N-dimethylformamide, and 34.8% of tetrahydrofuran; the formula of the second casting solution is: 4 % SiO 2 , 57.6% of N,N-dimethylformamide, 38.4% of tetrahydrofuran.

[0033] The first casting solution preparation step is: adding polyvinyl chloride to a mixed solvent of N,N-dimethylformamide and tetrahydrofuran (V / V=3:2), stirring for 3 hours at a temperature of 40°C, Obtain a uniform casting solution;

[0034] The second casting solution preparation step is: first SiO 2 (40nm) was added into a mixed solvent of N,N-dimethylformamide and tetrahydrofuran (V / V=3:2) and mechanically stirred for 0.5h, then stirred and dissolved at a temperature of 40°C for 3h to obtain Uniform casting solution;

[0035] 2) The casting solution obtained in step 1) is left to defoam at room temperature;

[0036] 3) Turn on the temperature and humidity controller of the elect...

Embodiment 2

[0040] 1) In terms of mass fraction, the formula of the first casting solution is: 13% of polyvinyl chloride, 52.2% of N,N-dimethylformamide, 34.8% of tetrahydrofuran (the formula is the same as in Example 1); component two The formulation is: 2% SiO 2 , 58.8% of N,N-dimethylformamide, 39.2% of tetrahydrofuran.

[0041]The preparation step of the first casting solution is: add polyvinyl chloride to the mixed solvent (3:2) of N,N-dimethylformamide and tetrahydrofuran, stir and dissolve at a temperature of 40°C, and the stirring time is 3h , to obtain a uniform casting solution;

[0042] The second casting solution preparation step is: SiO 2 (40nm) into a mixed solvent of N,N-dimethylformamide and tetrahydrofuran (3:2) and mechanically stirred for 0.5h, then stirred and dissolved at a temperature of 40°C for 3h to obtain a uniform casting solution ;

[0043] 2) The casting solution obtained in step 1) is left to defoam at room temperature;

[0044] 3) Turn on the temperatur...

Embodiment 3

[0048] 1) In terms of mass fraction, the formula of the first casting solution is: 15% polyvinylidene fluoride, 0.05% anhydrous lithium chloride, 42.5% N,N-dimethylacetamide, 42.5% acetone; The formula of the second casting liquid is: 60wt% polytetrafluoroethylene emulsion (aqueous solution).

[0049] The preparation step of the first casting solution is: adding polyvinylidene fluoride and anhydrous lithium chloride to a mixed solvent (1:1) of N,N-dimethylacetamide and acetone, and at a temperature of 40°C Stir to dissolve, and the stirring time is 3 hours to obtain a uniform casting solution;

[0050] 2) The casting solution obtained in step 1) is left to defoam at room temperature;

[0051] 3) Turn on the temperature and humidity controller of the electrospinning machine, and control the temperature at 30° C. and the humidity at 60%.

[0052] Put the polyester braided tube on the roller, and then set the relevant parameters of electrospinning. Pour the two components into...

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Abstract

The invention discloses a preparation method of a three-dimensional hydrophobic tubular nanofiber membrane. The preparation method comprises the following steps: uniformly dissolving a hydrophobic polymer in a mixed solvent to form a first membrane casting solution; taking a solution of hydrophobic nanoparticles as a second membrane casting solution; respectively putting the first membrane castingsolution and the second membrane casting solution into a first spinning injector and a second spinning injector, and collecting nanofibers on a receiver filled with a tubular support material under certain conditions; and taking down a tubular braided tube after spinning, and volatilizing solvents to obtain the nanofiber membrane, wherein the first spinning injector and the second spinning injector are located on the front upper portion and the rear upper portion of the receiver respectively and located in a plane which passes through the center of the receiver in the width direction and is perpendicular to the axis of the receiver. The membrane prepared by using the method is high in porosity, high in mechanical strength, good in thermal stability, good in lipophilicity and hydrophobicity and excellent in separation stability and reusability, and has long-time separation efficiency of greater than 95%.

Description

technical field [0001] The invention relates to the field of nanofiber membrane preparation, in particular to a preparation method of a three-dimensional hydrophobic tubular nanofiber membrane. Background technique [0002] At present, membrane separation technology has been widely used and developed in seawater desalination, water treatment, printing and dyeing, food, medicine, petroleum and other fields due to its high efficiency, low pollution, low energy consumption, and simple operation process. [0003] Hydrophobic membrane is a kind of membrane, and the hydrophobic stability of hydrophobic membrane is a key issue in the application process of hydrophobic membrane. The production process of traditional hydrophobic membranes is complicated and the cost of use is high, and the general method of manufacturing hydrophobic membranes is mainly to modify the two-dimensional hydrophobic layer by using low surface energy materials or by increasing the surface roughness. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/04B01D67/00
CPCB01D69/04B01D67/0002B01D2325/38B01D2325/24
Inventor 刘海亮徐红燕肖长发
Owner TIANJIN POLYTECHNIC UNIV
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