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A kind of preparation method of perfluoropolymer hollow fiber membrane

A perfluoropolymer and fiber membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of long time-consuming, cumbersome steps, low recovery rate, etc., and achieve improved dispersion and fluidity, good dispersion function, the effect of good pressure resistance

Active Publication Date: 2021-09-17
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fumed silica used in this method is expensive, and the reaction between lye and silica is slow and takes too long. The dichloromethane used to extract the organic liquid is easy to volatilize because of its low melting point, and the energy consumption is large during recovery. low rate
The document with application number 201710447581.7 discloses a polyperfluoroethylene propylene hollow fiber membrane and its preparation method, but the method needs to pass supercritical CO 2 , pressurization, pressure relief, etching and a series of steps, the steps are relatively cumbersome and require high equipment

Method used

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  • A kind of preparation method of perfluoropolymer hollow fiber membrane
  • A kind of preparation method of perfluoropolymer hollow fiber membrane
  • A kind of preparation method of perfluoropolymer hollow fiber membrane

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preparation example Construction

[0020] The invention provides a kind of preparation method (abbreviation method) of perfluoropolymer hollow fiber membrane, it is characterized in that the method comprises the following steps:

[0021] Step 1. Preparation of film-making formula: mix water-soluble polymer porogen, water-soluble inorganic porogen and auxiliary additives by ball milling to obtain water-soluble composite porogen, and then ball mill with film-forming polymer to obtain mixed Uniform material; wherein film-forming polymer 60~75wt%, water-soluble polymer porogen 10~20wt%, water-soluble inorganic porogen 10~20wt% and auxiliary additive 0~10wt%, the sum of each component is 100wt%;

[0022] The ball mill adopts a dry milling method, the temperature is 25-40°C, the rotation speed is 300-600r / min, and the ball milling time is 3-12h;

[0023] The film-forming polymer is one of polyperfluoroethylene propylene (FEP), polyvinylidene fluoride (PVDF) or polyvinylidene fluoride-hexafluoropropylene copolymer (P...

Embodiment 1

[0031] Step 1, adopt ball mill (model: Xqm2-6) with the anhydrous calcium chloride of 15wt% polyoxyethylene (molecular weight 1,000,000), 15wt% at 38 ℃ with 500r / min after ball milling 6h, then with 70wt% Polyfluorinated ethylene propylene (FEP) powder is ball milled and mixed evenly.

[0032] Step 2. Feed the above blend into a twin-screw extruder for extrusion and granulation to obtain evenly mixed particles, which are automatically fed into the twin-screw extruder through the feeding hopper and passed through the hollow spinneret assembly at 290°C Quantitative extrusion, the inside of the component is filled with nitrogen, stretched through the spinneret, the spinning melt enters the first winding after passing through a 20cm air layer, and the draw ratio of the spinneret is 1.2 times; after fully solidified in the air bath , online stretching and winding in the air, the online stretching ratio is 3 times, and after washing with water for 12 hours, the FEP hollow fiber memb...

Embodiment 2

[0034] The preparation method of the FEP hollow fiber membrane of this embodiment is the same as step 1 and step 2 of embodiment 1.

[0035] Step 3. Thermally stretch the FEP hollow fiber membrane obtained in step 2 at a stretching rate of 1 mm / min in a hot oven stretching machine at 140° C., with a stretching ratio of 30%, and heat-setting for 30 minutes at fixed length.

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Abstract

The invention discloses a preparation method of a perfluoropolymer hollow fiber membrane. In the method, the water-soluble polymer porogen, the water-soluble inorganic porogen and the auxiliary additives are mixed by ball milling to obtain the water-soluble composite porogen, which is then ball-milled with the film-forming polymer to obtain a uniformly mixed material. Then through extrusion and granulation to obtain uniformly mixed particles, the particles are quantitatively extruded through a hollow spinneret assembly, and an inert gas is introduced into the assembly, stretched through a spinneret, and the spinning melt is solidified in an air bath. On-line stretching and winding is performed in the air, and the water-soluble composite porogen is removed by extraction and washing to obtain a hollow fiber membrane. The polyethylene oxide in the composite porogen has good compatibility with the film-forming polymer, which improves the dispersion and fluidity of the inorganic particles in the film-forming polymer, and the addition of the inorganic particles avoids the polyethylene oxide in the spinning process. Medium fiber. It adopts melt spinning and drawing method without any solvent, diluent or plasticizer, which is green and environmentally friendly.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a preparation method of a perfluoropolymer hollow fiber membrane. Background technique [0002] Hollow fiber membrane is one of the main forms of separation membrane. Due to the special advantages of hollow fiber membrane, people pay more and more attention to it. At present, it has been widely used in water treatment, food, petrochemical, pharmaceutical, steel, electric power and other fields. . [0003] The typical preparation methods of hollow fiber membranes include solution spinning method (such as solution phase inversion method) and melt spinning method. However, the hollow fiber membrane prepared by the solution method has disadvantages such as low strength and easy shrinkage of the membrane during the drying process. At the same time, a large amount of solvent is used in the preparation process, and the solvent system needs to be recovered, separated and recycled, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/08B01D71/32B01D71/34
CPCB01D67/0002B01D69/02B01D69/08B01D71/32B01D71/34B01D2325/36B01D2325/38
Inventor 肖长发黄岩黄庆林刘海亮潘金峰
Owner TIANJIN POLYTECHNIC UNIV