Preparation method of high bonding strength polytetrafluoroethylene hollow fiber membrane

A polytetrafluoroethylene and fiber membrane technology, which is applied in the field of preparation of high bonding strength polytetrafluoroethylene hollow fiber membrane, can solve the problem that the pore diameter of the polytetrafluoroethylene hollow fiber membrane is unstable, easy to fall off, and the bonding strength is not enough. And other issues

Active Publication Date: 2021-08-17
NINGBO SHUIYI FILM TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention overcomes the disadvantages that the polytetrafluoroethylene hollow fiber membrane has a large aperture and cannot meet the requirements of high-precision separation and filtration, and the wrapped polytetrafluoroethylene hollow fiber membrane has an unstable aperture, insufficient bonding strength, and easy shedding phenomenon. , provides a method for preparing a polytetrafluoroethylene hollow fiber membrane with high bonding strength, the polytetrafluoroethylene hollow fiber membrane prepared by the method has stable filtration pore size, high filtration flux, high bonding strength, polytetrafluoroethylene Hollow fiber membrane filtration pore size can meet the requirements of high precision separation and filtration

Method used

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  • Preparation method of high bonding strength polytetrafluoroethylene hollow fiber membrane

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Effect test

Embodiment 1

[0021] Example 1: A method for preparing a high bond strength polytetrafluoroethylene hollow fiber membrane, comprising the following steps: (1) cutting, selecting a fully sintered biaxially stretched polytetrafluoroethylene flat membrane with an average pore size range of 0.05 μm-0.5μm, the thickness is 5μm-50 μm, the endothermic peak of PTFE material obtained by differential scanning calorimetry is at 325°C-335°C, and the flat film of biaxially stretched PTFE is completely sintered Slit into polytetrafluoroethylene tape film with a width of 5mm-15mm;

[0022] (2) Impregnation, immersing the polytetrafluoroethylene tape film in the low molecular weight polytetrafluoroethylene organic dispersion; the mass fraction of low molecular weight polytetrafluoroethylene in the low molecular weight polytetrafluoroethylene organic dispersion is 10-60% The number average molecular weight of low molecular weight polytetrafluoroethylene in low molecular weight polytetrafluoroethylene organi...

Embodiment 2

[0024] Embodiment 2: A kind of preparation method of high bonding strength polytetrafluoroethylene hollow fiber membrane, comprises the following steps: (1) cutting, selects biaxially stretched polytetrafluoroethylene fully sintered flat membrane, and its average pore diameter is 0.05 μm, the thickness is 50 μm, and the endothermic peak of the polytetrafluoroethylene material obtained by differential scanning calorimetry is at 325°C. Tetrafluoroethylene tape film;

[0025] (2) Dipping, immersing the polytetrafluoroethylene tape film in the low molecular weight polytetrafluoroethylene organic dispersion; the mass fraction of low molecular weight polytetrafluoroethylene in the low molecular weight polytetrafluoroethylene organic dispersion is 10%; low The number average molecular weight of the low molecular weight polytetrafluoroethylene in the molecular weight polytetrafluoroethylene organic dispersion is 1 million; the average particle size of the low molecular weight polytetr...

Embodiment 3

[0027] Embodiment 3: A kind of preparation method of high bonding strength polytetrafluoroethylene hollow fiber membrane, comprises the following steps: (1) cutting, selects biaxially stretched polytetrafluoroethylene fully sintered flat membrane, and its average pore diameter is 0.5 μm, the thickness is 5μm, and the endothermic peak of the polytetrafluoroethylene material obtained by differential scanning calorimetry is at 335°C. Vinyl fluoride strip film;

[0028] (2) Dipping, dipping the polytetrafluoroethylene tape film in the low molecular weight polytetrafluoroethylene organic dispersion; the mass fraction of low molecular weight polytetrafluoroethylene in the low molecular weight polytetrafluoroethylene organic dispersion is 60%; low The number average molecular weight of the low molecular weight polytetrafluoroethylene in the molecular weight polytetrafluoroethylene organic dispersion is 4 million; the average particle size of the low molecular weight polytetrafluoroet...

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Abstract

The invention discloses a preparation method of a polytetrafluoroethylene hollow fiber membrane with high bonding strength, which aims to solve the problem that the polytetrafluoroethylene hollow fiber membrane has a large pore size and cannot meet the requirements of high-precision separation and filtration. The pore size of the vinyl fluoride hollow fiber membrane is unstable, the bonding strength is not enough, and the phenomenon of shedding is prone to occur. The invention includes the following steps: (1) cutting, cutting the biaxially stretched polytetrafluoroethylene fully sintered flat film with an average pore size range of 0.05 μm-0.5 μm into polytetrafluoroethylene strip membranes; (2) impregnating, Immerse the polytetrafluoroethylene strip membrane in the low molecular weight polytetrafluoroethylene organic dispersion; (3) Wrap and shape, wrap the dipped polytetrafluoroethylene strip membrane in the average pore diameter range of 1μm-5μm Stretch on the outer wall of the polytetrafluoroethylene hollow fiber membrane, wrap 1-3 layers, and then heat-treat at 280-360°C for 5-30 seconds.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene hollow fiber membrane, more specifically, it relates to a preparation method of a polytetrafluoroethylene hollow fiber membrane with high bonding strength. Background technique [0002] PTFE material has outstanding chemical stability, excellent high and low temperature resistance and chemical corrosion resistance, so the filter material prepared with PTFE as raw material is widely used in the separation process under various harsh conditions. However, polytetrafluoroethylene is insoluble in general solvents, and has high viscosity and poor fluidity at high temperatures. Its "insoluble and non-melting" characteristics make it impossible to use wet spinning like polysulfone, polypropylene and polyvinylidene fluoride. Or melt spinning to prepare hollow fiber membrane materials. [0003] At present, the widely used preparation process of PTFE hollow fiber membrane is stretching method. Generally, the po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D69/08B01D67/00
CPCB01D67/0002B01D69/08B01D71/36B01D2325/02
Inventor 沈立强计根良朱东生曹志宏
Owner NINGBO SHUIYI FILM TECH DEV CO LTD
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