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High-efficiency adjustable mixed liquid separating fiber membrane and preparation method thereof

A technology of liquid separation and fiber membrane, which is applied in the direction of spinning solution preparation, fiber treatment, semi-permeable membrane separation, etc., to achieve the effect of simple preparation method, excellent mechanical properties and convenient operation

Active Publication Date: 2016-03-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current separation status of mixed organic liquids, the present invention provides a special wettable fiber membrane with high efficiency and adjustable separation range of mixed inorganic or organic liquids and its preparation method

Method used

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  • High-efficiency adjustable mixed liquid separating fiber membrane and preparation method thereof
  • High-efficiency adjustable mixed liquid separating fiber membrane and preparation method thereof
  • High-efficiency adjustable mixed liquid separating fiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Using the method provided by the invention to prepare a highly efficient and adjustable mixed liquid separation fiber membrane, the specific steps are as follows:

[0026] (1) Select the low surface energy material A as one of the methoxysilanes, heptadecafluorodecyltrimethoxysilane, and select the hydrophobic polymer B as polyvinylidene fluoride and hexafluoropropylene (average molecular weight is 400,000 ), select the organic solvent as a mixed solvent of N,N-dimethylacetamide and acetone. At room temperature, dissolve low surface energy substance A and hydrophobic polymer B in an organic solvent and stir until completely dissolved to obtain a polymer solution containing 15% by mass of hydrophobic polymer B as a spinning liquid.

[0027] In the organic solvent, the mass ratio of N,N-dimethylacetamide and acetone is 3:7. The mass ratio of polyvinylidene fluoride-hexafluoropropylene to heptadecafluorodecyltrimethoxysilane is 30:1.

[0028] (2) Place the ...

Embodiment 2

[0033] (1) Dissolve pure polyvinylidene fluoride (average molecular weight: 534,000) and heptadecafluorodecyltrimethoxysilane in an organic solvent to form a homogeneous polyvinylidene fluoride solution with a mass fraction of 20%. The organic solvent is a mixed solvent of analytically pure N,N-dimethylformamide and acetone with a mass ratio of 4:5. Wherein the mass ratio of polyvinylidene fluoride to heptadecafluorodecyltrimethoxysilane is 15:1.

[0034] (2) Place the spinning solution prepared in step (1) in the injector nozzle of the electrospinning device, select the diameter of the metal spinneret to be 0.5-1.2mm, apply a voltage of 22kV, and when the working distance is 15-25cm Perform electrospinning. The spinning solution is stretched into filaments against the surface tension under the action of electrostatic force, and collected on the receiving substrate to obtain a three-dimensional porous network fiber membrane, that is, the mixed liquid separation fiber membrane...

Embodiment 3

[0038] (1) Dissolving pure polyurethane methyl ester and heptadecafluorodecyltriethoxysilane in an organic solvent, the mass ratio w / w of tetrahydrofuran and N,N-dimethylformamide in the organic solvent =1:1, prepared as a polyurethane solution with a concentration of 8% by mass percent. Wherein, the mass ratio of methyl polyurethane to heptadecafluorodecyltriethoxysilane is 10:1, and the spinning solution is obtained.

[0039] (2) Place the spinning solution prepared by step (1) in the syringe nozzle of an electrospinning device with a diameter of 0.5 to 0.8 mm, apply a voltage of 8 to 15 kV and carry out electrospinning when the working distance is 25 cm, with The aluminum foil is used as the receiving base to receive the fiber, and a three-dimensional network porous structure non-woven fiber membrane of polyamide methyl grafted with heptadecafluorodecyltriethoxysilane is obtained.

[0040] The average diameter of fiber filaments in the electrospinning mixed liquid separati...

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Abstract

The invention discloses a high-efficiency adjustable mixed liquid separating fiber membrane and a preparation method thereof, and belongs to the technical field of functional micro / nano fiber materials. The preparation method includes the steps of dissolving a low-surface energy substance A and a hydrophobic polymer B in organic solvent at a room temperature to be fully stirred till being completely dissolved, and obtaining a polymer solution as a spinning solution, wherein the polymer solution contains, by mass, 8-20% of hydrophobic polymer B; conducting static spinning to obtain a static spinning porous mesh-shaped fiber membrane, wherein the diameter of the fiber ranges from 100 nanometers to 3 microns. The membrane can be used for separation of inorganic / organic mixed liquid and can also be used for separation of organic / organic mixed liquid. The separation range of liquid can be controlled by adjusting the surface of the fiber membrane, and the application range is wide. The preparation method is simple, easy to operate, high in efficiency and capable of being used for preparing the mixed liquid separating membrane on a large scale.

Description

technical field [0001] The invention belongs to the technical field of functional micro-nano fiber materials. In particular, it relates to a high-efficiency and adjustable electrospun fiber membrane for separating two-phase mixed liquids and a preparation method thereof. Background technique [0002] In recent years, in response to the huge pollution and damage to the environment caused by the leakage of crude oil and the generation and discharge of oily sewage in production and life, a large number of research progresses on oil-water separation have been reported and significant achievements have been made. However, the separated oil phase is often not a single one, but a mixture of various organic solvents. The traditional separation of mixed organic liquids is mostly through traditional methods such as distillation and extraction. The separation process not only wastes a lot of material and material resources, but also has high energy consumption, low separation efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D01D1/02D01D5/00B01D71/32B01D71/34
CPCB01D71/32B01D71/34D01D1/02D01D5/003D04H1/728
Inventor 王女侯兰兰赵勇
Owner BEIHANG UNIV
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