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Preparing method of ultrafiltration micro-pore reverse osmosis PTFE film, filter element and filtering system

A PTFE and reverse osmosis technology, applied in ultrafiltration, reverse osmosis, semi-permeable membrane separation, etc., can solve the problems of low water flux and poor air permeability, and achieve high filtration efficiency, strong water penetration resistance, and high porosity high effect

Inactive Publication Date: 2018-09-28
NINGBO TONGGUAN ELECTRIC AUTOMATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the PTFE porous membranes in the prior art are generally hydrophobic, have poor air permeability and low water flux, which limits their application in the field of water treatment.

Method used

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  • Preparing method of ultrafiltration micro-pore reverse osmosis PTFE film, filter element and filtering system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of an ultrafiltration microporous reverse osmosis PTFE membrane, comprising the following steps:

[0026] Step 1): PTFE resin and kerosene are mixed and matured in a high-temperature mixer, wherein the weight ratio of the PTFE resin and kerosene is 1:1.25 to obtain a paste;

[0027] Step 2): The paste obtained in step 1) is extruded through an extruder to obtain a raw material, the extrusion pressure is 4.0MPa, and the extrusion speed is 2.5m / min;

[0028] Step 3): The initial material obtained in step 2) is first stretched longitudinally at a temperature of 150° C. to form a base film, and then stretched on a transverse stretching machine to form a PTFE biaxially stretched microporous membrane with a width of 3 m, wherein The longitudinal stretch ratio is 8 times, and the transverse stretch ratio is 8 times;

[0029] Step 4): The PTFE biaxially stretched microporous membrane obtained in step 3) is placed in an acetone solution to soak to remove su...

Embodiment 2

[0033] A preparation method of an ultrafiltration microporous reverse osmosis PTFE membrane, comprising the following steps:

[0034] Step 1): PTFE resin and kerosene are mixed and matured in a high-temperature mixer, wherein the weight ratio of the PTFE resin and kerosene is 1:1.25 to obtain a paste;

[0035] Step 2): The paste obtained in step 1) is extruded through an extruder to obtain a raw material, the extrusion pressure is 4.5MPa, and the extrusion speed is 1.5m / min;

[0036] Step 3): The initial material obtained in step 2) is first stretched longitudinally at a temperature of 150° C. to form a base film, and then stretched on a transverse stretching machine to form a PTFE biaxially stretched microporous membrane with a width of 2 m, wherein The longitudinal stretch ratio is 5 times, and its transverse stretch ratio is 8 times;

[0037] Step 4): The PTFE biaxially stretched microporous membrane obtained in step 3) is placed in an acetone solution to soak to remove su...

Embodiment 3

[0041] A preparation method of an ultrafiltration microporous reverse osmosis PTFE membrane, comprising the following steps:

[0042] Step 1): PTFE resin and kerosene are mixed and matured in a high-temperature mixer, wherein the weight ratio of the PTFE resin and kerosene is 1:1.25 to obtain a paste;

[0043] Step 2): The paste obtained in step 1) is extruded through an extruder to obtain a raw material, the extrusion pressure is 4.2MPa, and the extrusion speed is 1.5m / min;

[0044] Step 3): The initial material obtained in step 2) is first stretched longitudinally at a temperature of 150° C. to form a base film, and then stretched on a transverse stretching machine to form a PTFE biaxially stretched microporous membrane with a width of 3 m, wherein The longitudinal stretch ratio is 6 times, and the transverse stretch ratio is 10 times;

[0045] Step 4): The PTFE biaxially stretched microporous membrane obtained in step 3) is placed in an acetone solution to soak to remove sur...

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Abstract

The invention provides a preparing method of an ultrafiltration micro-pore reverse osmosis PTFE film. The method includes the steps of firstly, placing PTFE resin and a lubricant in a high-temperaturemixer to be mixed and cured to obtain a paste material; secondly, conducting extrusion forming on the paste material through an extruder to obtain a primary material; thirdly, longitudinally stretching the primary material at the temperature of 150-350 DEG C to prepare a base film, and stretching the base film on a transverse stretcher to form a PTFE bidirectional stretched micro-pore film with the width of 1-3 m; fourthly, soaking the PTFE film in an ethanol solution of polybutyl acrylate under the alkaline catalysis of NaOH, and conducting hydrolysis modification on the surface of the PTFEfilm; fifthly, spraying and drying a fluorine resin suspension emulsion on the surface of the PTFE micro-pore composite film; sixthly, conducting sintering and sizing to prepare the ultrafiltration micro-pore reverse osmosis PTFE film. The ultrafiltration micro-pore reverse osmosis PTFE film is prepared through the mixing and curing of the PTFE resin and the lubricant, extruding, stretching, modifying, combining and sintering.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and in particular relates to a preparation method of an ultrafiltration microporous reverse osmosis PTFE membrane, a filter element and a filtration system. Background technique [0002] The English abbreviation of polytetrafluoroethylene is PTFE. PTFE porous membrane has the advantages of acid and alkali resistance, chemical corrosion resistance, radiation resistance and excellent biocompatibility. It is a membrane material with excellent performance for filtering and separating fine particles. It is an environmentally friendly It is an ideal membrane separation material for industries such as chemical industry and biomedicine. Making it into a hollow fiber structure can significantly increase the packing density of its components, give full play to the advantages of efficient separation and space saving of membrane products, and further improve the filtration accuracy and filtratio...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D61/14B01D67/00B01D69/02B01D69/12B01D71/36
CPCB01D61/025B01D61/145B01D67/0002B01D67/0093B01D69/02B01D69/12B01D71/36B01D2325/36
Inventor 张立
Owner NINGBO TONGGUAN ELECTRIC AUTOMATION EQUIP
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