A casting method of a polytetrafluoroethylene hollow fiber membrane module

A technology of polytetrafluoroethylene and casting method, which is applied in the direction of chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., and can solve leakage, easy detachment of polytetrafluoroethylene hollow fiber membrane modules, danger of use, etc. question

Inactive Publication Date: 2018-01-09
贵州省材料技术创新基地
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a method for casting polytetrafluoroethylene hollow fiber membrane modules, which mainly solves the problem of leakage ...

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 of the present invention: the casting method of polytetrafluoroethylene hollow fiber membrane module is characterized in that, comprises the steps:

[0014] 1) The PTFE hollow fiber membrane is treated by plasma surface treatment technology. The treatment voltage is 220V, the discharge distance is 10mm, and the treatment time is 30s;

[0015] 2) After the treated polytetrafluoroethylene hollow fiber membrane is leveled, the two ends of the membrane filament are 5-10 cm away, and the PVA aqueous solution is used for coating treatment. , after the PVA is completely dissolved, the added mass fraction is 25% glutaraldehyde and 0.5mol / L hydrochloric acid for cross-linking;

[0016] 3) Dry the coated polytetrafluoroethylene hollow fiber membrane at 25° C. (drying time 24 hours), arrange the dried polytetrafluoroethylene hollow fiber membrane evenly, and seal the end with a sealant;

[0017] 4) Put the capped polytetrafluoroethylene hollow fiber membrane vertical...

Embodiment 2

[0019] Embodiment 2 of the present invention: the casting method of polytetrafluoroethylene hollow fiber membrane module is characterized in that, comprises the following steps:

[0020] 1) The polytetrafluoroethylene hollow fiber membrane is treated by plasma surface treatment technology. The treatment voltage is 220V, the discharge distance is 5mm, and the treatment time is 30min;

[0021] 2) After the treated polytetrafluoroethylene hollow fiber membrane is leveled, at the 5-10cm of the two ends of the membrane filament, the coating process is carried out with a PVA aqueous solution, which is obtained by adding 5% PVA to water , after the PVA is completely dissolved, the added mass fraction is 25% glutaraldehyde and 0.5mol / L hydrochloric acid for cross-linking;

[0022] 3) drying the coated polytetrafluoroethylene hollow fiber membrane at 25°C (drying time 36h), tidying up the dried polytetrafluoroethylene hollow fiber membrane, and sealing the end with a sealant;

[0023]...

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Abstract

A casting method of a polytetrafluoroethylene hollow fiber membrane module is disclosed. After a polytetrafluoroethylene hollow fiber membrane is treated by adopting a plasma surface treatment technique, then two ends of the treated polytetrafluoroethylene hollow fiber membrane are coated with an aqueous PVA solution, then the polytetrafluoroethylene hollow fiber membrane is dried, is subjected toend sealing with sealing glue and is put into a casting shell, and casting is performed by utilizing an epoxy resin adhesive to obtain the polytetrafluoroethylene hollow fiber membrane module. The method mainly overcomes a problem that polytetrafluoroethylene hollow fiber membrane modules are prone to silk shedding in a using process so as to cause leakage, and avoids use of a highly dangerous sodium naphthalenide solution in a casting process.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a casting method of a polytetrafluoroethylene hollow fiber membrane module. Background technique [0002] PTFE is a polymer material with excellent comprehensive properties. It has excellent chemical stability, thermal stability and mechanical stability. PTFE hollow fiber membranes have broad application prospects in aerospace, petrochemical, machinery and other fields. . Due to the extremely low surface energy of PTFE hollow fiber membranes, it has poor affinity with conventional epoxy resin adhesives and low bonding strength, which makes PTFE hollow fiber membrane modules easy to detach during use. cause leakage. Therefore, the casting problem of polytetrafluoroethylene hollow fiber membrane modules needs to be solved urgently. For example, CN201010231157 uses epoxy resin adhesive and polyurethane adhesive to mix secondary casting to prepare membrane components, bu...

Claims

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Application Information

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IPC IPC(8): B01D63/02
Inventor 姚勇张敏敏秦舒浩张凯舟韦福建邵会菊
Owner 贵州省材料技术创新基地
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