A kind of manufacture method of polytetrafluoroethylene hollow fiber membrane

A technology of polytetrafluoroethylene and its manufacturing method, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of wasting water resources and waste water, low membrane porosity, high operating temperature, etc., and achieve environmental pollution Small size, simple process, and the effect of increasing porosity

Inactive Publication Date: 2011-12-21
ZHEJIANG DONGDA ENVIRONMENTAL ENG
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The wet preparation of PTFE hollow fiber membranes researched in China requires a large amount of water to replace the PTFE dispersion in the manufacturing process, which wastes water resources and generates a lot of waste water, and the strength of the manufactured membranes is very low
The PTFE hollow fiber membrane is prepared by the melting method. Due to the process requirements and the high operating temperature, the energy consumption is high. Because the pore-forming agent is used to achieve the purpose of forming holes, the porosity of the membrane prepared by the melting method is low.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] A kind of manufacture method of polytetrafluoroethylene hollow fiber membrane, comprises the following steps:

[0017] Step 1: Use a PET fiber braided tube with an inner diameter of 1 mm and an outer diameter of 1.8 mm as a support tube, and coat the PET fiber braided tube with an adhesive, which includes a terpolymer with a mass fraction of 75% a, a terpolymer b with a mass fraction of 25%, the terpolymer a is a thermoplastic terpolymer of 1,1-difluoroethylene, tetrafluoroethylene and hexafluoropropylene, the terpolymer b is a terpolymer of glycidyl methacrylate, ethylene and acrylate;

[0018] Step 2: Continuously wrap the PTFE flat film with a pore size of 0.1-0.5 μm, a porosity of 60%-90%, a thickness of 0.25mm, and a width of 6mm on the PET fiber braided tube. When wrapping, the adjacent PTFE flat film The films were partially overlapped, and the width of the overlapping portion was 1 mm. ;

[0019] Step 3: Carry out drying, the drying temperature is 100°C, and ...

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PUM

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Abstract

The invention provides a method for manufacturing a polytetrafluoroethylene hollow fiber membrane, comprising the following steps: step 1: using a PET fiber braided tube as a support tube, and coating the PET fiber braided tube with an adhesive; step 2: applying a PTFE flat The membrane is continuously wrapped on the PET fiber braided tube, and the adjacent PTFE flat membrane partially overlaps during wrapping; Step 3: Drying. By selecting high-quality PTFE flat membranes and precisely controlling the pore size of PTFE hollow fiber membranes, the porosity of PTFE hollow fiber membranes can be effectively increased, thereby improving the membrane flux of the fiber membranes, and the process is simple, easy to operate, and environmentally friendly. Pollution is small.

Description

technical field [0001] The invention relates to a manufacturing method of a polytetrafluoroethylene hollow fiber membrane using a braided tube as a supporting tube. Background technique [0002] Polytetrafluoroethylene (PTFE) hollow fiber membranes can be widely used in membrane separation processes such as microfiltration, ultrafiltration, membrane distillation, pervaporation, membrane contactors, and membrane reactors. It has a very wide range of potential applications in the fields of medical devices and artificial blood vessels. PTFE hollow fiber membrane has the advantages of acid and alkali resistance, oxidation resistance, microbial erosion resistance, and good blood compatibility. Compared with other hollow fiber membranes, it has obvious advantages in microfiltration and some ultrafiltration applications. At present, although there are related researches in China, they are all prepared by wet method and melting method. Domestically researched wet preparation of PT...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/36B01D67/00
Inventor 傅叶明吴益尔
Owner ZHEJIANG DONGDA ENVIRONMENTAL ENG
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