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Continuously-super-hydrophobic hollow fiber membrane and preparation method thereof

A fiber membrane and super-hydrophobic technology, which is applied in the field of continuous super-hydrophobic hollow fiber membrane and its preparation, can solve the problems of environmental pollution, wide pore size distribution of membrane, and limited popularization and application, and achieve the effect of high strength and good porous performance.

Active Publication Date: 2014-06-04
江苏膜芮环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the continuous hydrophobic performance of the above-mentioned membrane materials is not strong, it is easy to be wetted by liquid after long-term application, which leads to membrane failure and limits its popularization and application.
In addition, the preparation method of the above-mentioned membrane materials (PP, PE)-melt spinning stretching method has a wide membrane pore size distribution and is difficult to control, and the preparation method of PVDF hydrophobic membrane-solution phase inversion method or thermally induced phase separation method is due to the use of A large amount of organic solvents or diluents, there are disadvantages such as environmental pollution, complicated solvent recovery, and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Preparation of hollow braided tube: A 16-spindle high-speed braiding machine was used to weave polyester FDY filaments with a specification of 150D / 600D into a hollow braided tube base film with a braiding pitch of 550 μm.

[0024] 2) Preparation of coating solution: configure a PVA aqueous solution with a mass concentration of 10wt%, and then add a concentrated dispersion emulsion of 30wt% PTFE (the mass ratio of solid content PTFE to PVA is 3:1) to the PVA aqueous solution with a mass concentration of 10wt%. After stirring evenly, vacuum Degassing to obtain a uniform coating solution.

[0025] 3) Preparation of nascent hollow fiber membrane: According to the co-extrusion process of skin / core composite spinning spinneret, the coating solution prepared in step 2) is evenly coated on the base membrane obtained in step 1), and then passed through a 90°C hot air tunnel Heat drying for 30s to obtain the nascent hollow fiber membrane.

[0026] 4) Sintering nascent hollow...

Embodiment 2

[0028] 1) Preparation of hollow braided tube: A 16-spindle high-speed braiding machine was used to weave polyester FDY filaments with a specification of 150D / 600D into a hollow braided tube base film with a braiding pitch of 550 μm.

[0029] 2) Preparation of coating solution: configure a PVA aqueous solution with a mass concentration of 10wt%, and then add a concentrated dispersion emulsion of 30wt% PVDF (the mass ratio of solid content PVDF to PVA is 3:1) to the PVA aqueous solution, stir evenly, and vacuum Degassing to obtain a uniform coating solution.

[0030] 3) Preparation of nascent hollow fiber membrane: According to the co-extrusion process of skin / core composite spinning spinneret, the coating solution prepared in step 2) is evenly coated on the base membrane obtained in step 1), and then passed through a 90°C hot air tunnel Heat drying for 30s to obtain the nascent hollow fiber membrane.

[0031] 4) Sintering nascent hollow fiber membrane: The dried nascent hollow...

Embodiment 3

[0033] 1) Preparation of hollow braided tube: use a 16-spindle high-speed braiding machine to weave nylon filaments with a specification of 333D / 36F into a hollow braided tube base film with a braiding pitch of 550 μm.

[0034] 2) Preparation of coating solution: configure a PVA aqueous solution with a mass concentration of 10wt%, and then add a concentrated dispersion emulsion of 30wt% PVDF (the mass ratio of solid content PVDF to PVA is 3:1) to the PVA aqueous solution, stir evenly, and vacuum Degassing to obtain a uniform coating solution.

[0035] 3) Preparation of nascent hollow fiber membrane: According to the co-extrusion process of skin / core composite spinning spinneret, the coating solution prepared in step 2) is evenly coated on the base membrane obtained in step 1), and then passed through a 90°C hot air tunnel Heat drying for 30s to obtain the nascent hollow fiber membrane.

[0036] 4) Sintering nascent hollow fiber membrane: The dried nascent hollow fiber membran...

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Abstract

The invention discloses a continuously-super-hydrophobic hollow fiber membrane and a preparation method thereof. The hollow fiber membrane and the preparation method are characterized in that: the hollow fiber membrane is prepared by a coating-sintering method; and the preparation method includes 1) a step of preparing hollow braided tube, namely, a step of weaving fiber twisted with filaments by utilization of a two-dimensional weaving technology to obtain a hollow braided tube substrate; 2) a step of preparing a coating liquid, namely, a step of uniformly mixing an aqueous solution of fibre-forming polymer with low decomposition temperature and a concentrated dispersive emulsion of fluorine-containing polymer to obtain the coating liquid, wherein the aqueous solution of fibre-forming polymer is adopted as a membrane forming carrier and the concentrated dispersive emulsion is adopted as dispersoid; 3) a step of preparing a primary hollow fiber membrane, namely a step of uniformly coating the external surface of the hollow braided tube with the coating liquid by adoption of a skin / core composite spinning technology to obtain the primary hollow fiber membrane; and 4) a step of sintering, namely, a step of sintering the primary hollow fiber membrane at 200-300 DEG C for 1-2 min to obtain the hollow fiber membrane. The hollow fiber membrane is high in strength and good in porous performance. The continuous super-hydrophobic property of the hollow fiber membrane is particularly suitable for processes of membrane contactors, such as membrane distillation and membrane absorption.

Description

technical field [0001] The invention belongs to the fields of membrane technology and environmental protection, and specifically relates to a continuous super-repellent hollow fiber membrane and a preparation method thereof. Background technique [0002] The membrane contactor made of hydrophobic hollow fiber membrane has the advantages of large and fixed contact area, independent control of fluid flow rate range, no density difference between fluids, and mass transfer contact between two fluids of the same density. It is widely used in new membrane processes such as membrane extraction, membrane absorption, membrane distillation, and membrane crystallization. [0003] Currently, commercial hydrophobic hollow fiber membrane materials include polypropylene (PP), polyethylene (PE) or polyvinylidene fluoride (PVDF). Since the continuous hydrophobic performance of the above-mentioned membrane materials is not strong, it is easy to be wetted by liquid after long-term application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/38B01D67/00B01D71/32B01D71/34
Inventor 黄庆林吴艳杰肖长发陈凯凯
Owner 江苏膜芮环保科技有限公司
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