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Method for fabricating fiber reinforcement type microporous filter membranes of hollow fiber made from polyvinylidene fluoride

A polyvinylidene fluoride, fiber-reinforced technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low tensile strength of hollow fiber membranes and inability to meet the strength requirements of hollow fiber membranes, etc. Achieve high tensile strength, easily controllable pore size range, and tight bonding

Inactive Publication Date: 2005-11-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tensile strength of the PVDF hollow fiber membrane prepared by the common immersion precipitation method is generally relatively low, and its tensile strength is usually within 5MPa, which cannot meet the service strength requirements of the submerged membrane module for the hollow fiber membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1. Pass the processed 3 polyester fibers through the corresponding holes on the spinneret.

[0012] 2. Add PVDF, DMAC and PVP into the solvent tank, the ratio is 18:78:4.

[0013] 2. Stir at 25°C to form a homogeneous solution, and let stand to defoam.

[0014] 3. Control the pressure in the melting material tank to 0.25MPa, the temperature to 25°C, the flow rate of the core liquid to 5ml / min, and the traction speed to 50mm / s, so that the homogeneous solution passes through the spinneret, passes through the 25cm air gap, and enters the gel bath Solidification occurs, and it is spun into PVDF hollow fiber membranes.

[0015] 4. Soak the hollow fiber membrane spun in the previous step in water to complete the curing process.

[0016] The prepared reinforced PVDF hollow fiber membrane has a porosity of 86%, and a pure water flux of 146kg / m under a pressure difference of 0.04MPa. 2 .h, the average pore diameter is 0.5 microns, the outer diameter of the hollow fiber is 1....

Embodiment 2

[0024] 1. Pass the processed 3 polyester fibers through the corresponding holes on the spinneret.

[0025] 2. Add PVDF, DMAC and PVP to the solvent tank, the ratio is 20:76:4.

[0026] 2. Stir at 25°C to form a homogeneous solution, and let stand to defoam.

[0027] 3. Control the pressure in the melting material tank to 0.25MPa, the temperature to 25°C, the flow rate of the core liquid to 5ml / min, and the traction speed to 50mm / s, so that the homogeneous solution passes through the spinneret, passes through the 25cm air gap, and enters the gel bath Solidification occurs, and it is spun into PVDF hollow fiber membranes.

[0028] 4. Soak the hollow fiber membrane spun in the previous step in water to complete the curing process.

[0029] The prepared reinforced PVDF hollow fiber membrane has a porosity of 85%, and a pure water flux of 170kg / m under the pressure difference across the membrane of 0.04MPa 2 .h, the average pore diameter is 0.38 microns, the outer diameter of th...

Embodiment 3

[0037] 1. Pass the processed 3 polyester fibers through the corresponding holes on the spinneret.

[0038] 2. Add PVDF, DMAC and PVP to the solvent tank, the ratio is 25:70:5.

[0039] 2. Stir at 25°C to form a homogeneous solution, and let stand to defoam.

[0040] 3. Control the pressure in the melting material tank to 0.35MPa, the temperature to 25°C, the flow rate of the core fluid to 5ml / min, and the traction speed to 50mm / s, so that the homogeneous solution passes through the spinneret, passes through the 25cm air gap, and enters the gel bath Solidification occurs, and it is spun into PVDF hollow fiber membranes.

[0041] 4. Soak the hollow fiber membrane spun in the previous step in water to complete the curing process.

[0042] The prepared reinforced PVDF hollow fiber membrane has a porosity of 80%, and a pure water flux of 60kg / m under the pressure difference across the membrane of 0.04MPa 2 .h, the average pore diameter is 0.18 microns, the outer diameter of the ...

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Abstract

A fibre reinforced millipore filter membrane of hollow polyvinylidene fluoride fibre is prepared through preparing solution from polyvinylidene fluoride, solvent and additive, pretreating the reinforcing fibres, spinning, gelatinizing and post-treating. Said solvent, additive and reinforcing fibre are also disclosed.

Description

technical field [0001] The invention relates to a preparation method of a fiber-reinforced polyvinylidene fluoride hollow fiber microporous filter membrane. It belongs to the preparation technology of reinforced hollow fiber membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) hollow fiber membranes have attracted much attention due to their good corrosion resistance, solvent resistance, and temperature resistance, as well as easy preparation. However, the tensile strength of the PVDF hollow fiber membrane prepared by the common immersion precipitation method is generally low, and its tensile strength is usually within 5 MPa, which cannot meet the service strength requirements of the submerged membrane module for the hollow fiber membrane. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of fiber-reinforced polyvinylidene fluoride hollow fiber mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08
Inventor 李凭力王世昌李英栋解利昕
Owner TIANJIN UNIV
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