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A kind of polyperfluoroethylene propylene hollow fiber membrane and preparation method thereof

A polyperfluoroethylene propylene, fiber membrane technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of difficult feeding, easy volatilization of organic solvents, etc., achieve good mechanical strength, uniform distribution of openings, Excellent corrosion resistance and thermal stability

Inactive Publication Date: 2020-10-23
宁波绿色方舟环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of organic solvent is used in this preparation method, which makes feeding difficult during extrusion, and the organic solvent is easy to volatilize at high temperature, which has great safety risks and environmental hazards

Method used

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  • A kind of polyperfluoroethylene propylene hollow fiber membrane and preparation method thereof
  • A kind of polyperfluoroethylene propylene hollow fiber membrane and preparation method thereof
  • A kind of polyperfluoroethylene propylene hollow fiber membrane and preparation method thereof

Examples

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preparation example Construction

[0018] The invention provides a kind of preparation method of polyperfluoroethylene propylene hollow fiber membrane, it comprises the steps:

[0019] a) mixing polyperfluoroethylene propylene, porogen and dispersant, and making polyfluoroethylene propylene hollow fibers;

[0020] b) placing the polyperfluoroethylene propylene hollow fiber in an airtight container, and raising the temperature of the airtight container to 270°C-360°C;

[0021] c) Introduce supercritical carbon dioxide into the airtight container until the pressure in the airtight container reaches 25MPa-40MPa, and maintain the predetermined time T under the pressure, so that the supercritical carbon dioxide is evenly distributed in the polyperfluoroethylene propylene hollow fiber;

[0022] d) Relieving the pressure in the airtight container, foaming the supercritical carbon dioxide in the polyperfluoroethylene propylene hollow fiber, and obtaining the nascent membrane of the polyperfluoroethylene propylene hollo...

Embodiment 1

[0046] Step (1) Mix 945g of polyperfluoroethylene propylene (FEP), 50g of calcium carbonate, and 5g of stearic acid amide evenly, and melt and extrude through a twin-screw extruder to make FEP hollow fibers. The extrusion temperature is 300-330°C .

[0047] Step (2) The obtained FEP hollow fiber is placed in an autoclave connected to a supercritical carbon dioxide device, and carbon dioxide is fed in, and the low pressure is purged for 4 minutes. Set the autoclave temperature to 315°C.

[0048] Step (3) After the temperature is reached, feed supercritical carbon dioxide fluid until the pressure in the kettle reaches 30 MPa; maintain constant temperature and pressure for 20 minutes.

[0049] Step (4) Open the pressure relief valve of the autoclave, and release the pressure to normal pressure at a speed of 15 MPa / s to obtain the FEP hollow fiber nascent membrane.

[0050] Step (5) Soak the obtained FEP hollow fiber nascent membrane in a dilute hydrochloric acid solution with a...

Embodiment 2

[0054] The preparation method of the FEP hollow fiber membrane of this embodiment is basically the same as that of Example 1, the difference is that, before step (5) soaking the FEP hollow fiber nascent membrane in dilute hydrochloric acid, the FEP hollow fiber nascent membrane is stretched , wherein the stretching ratio is 2 times, the stretching medium is water, and the stretching temperature is 70°C.

[0055] please see Figure 4 , Figure 5 , the average pore diameter of the micropores in the section of the obtained FEP hollow fiber membrane was 11.3 μm, and the average thickness of the inner and outer skin layers were 1.9 μm and 1.1 μm, respectively.

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Abstract

The invention provides a fluorinated ethylene propylene hollow fiber membrane and a preparation method thereof. The method includes: a) mixing fluorinated ethylene propylene, a pore forming agent anda dispersing agent to obtain fluorinated ethylene propylene hollow fibers; b) adding the fluorinated ethylene propylene hollow fibers into an airtight container, and heating the airtight container to270-360 DEG C; c) feeding supercritical carbon dioxide into the airtight container until the pressure reaches 25MPa-40MPa; d) relieving the pressure of the airtight container, and enabling foaming ofsupercritical carbon dioxide to obtain a fluorinated ethylene propylene hollow fiber primary membrane with a plurality of first open pores; e) soaking the fluorinated ethylene propylene hollow fiber primary membrane into etching solution to form a plurality of second open pores through etching of the pore forming agent, so that the fluorinated ethylene propylene hollow fiber membrane is obtained.

Description

technical field [0001] The invention relates to the technical field of polymer membrane materials, in particular to a polyperfluoroethylene propylene hollow fiber membrane and a preparation method thereof. Background technique [0002] Hollow fiber membrane is a kind of membrane with fiber shape and self-supporting function. At present, the commonly used hollow fiber membrane materials are polyvinylidene fluoride (PVDF), polysulfone (PS), polyethersulfone (POS), sulfonated polysulfone (SPS), polyacrylonitrile (PAN) and cellulose. Prepared by non-solvent precipitation gel phase inversion method (NIPS). However, the strength of the hollow fiber membrane prepared by the NIPS method is poor, and the membrane filament is easily broken during use. Some researchers have also prepared reinforced hollow fiber membranes through the support layer method, but the adhesion between the resin and the support layer is poor, and burrs and uneven coating of the membrane layer are prone to d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/32B01D67/00B01D69/08
CPCB01D67/0002B01D69/08B01D71/32B01D2325/22B01D2325/24
Inventor 刘富林海波范德胜范燚张利娟
Owner 宁波绿色方舟环境工程有限公司
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