Polytetrafluoroethylene hollow fiber composite membrane and preparation method thereof

A polytetrafluoroethylene and fiber composite technology, which is applied in the field of separation membranes, can solve the problems of complex preparation process, dense skin layer or uncontrollable pore size, poor bonding strength between skin layer and support layer, etc., and achieves a simple preparation method and is conducive to high efficiency. The effect of penetration, protection against contamination and penetration of wetting

Active Publication Date: 2022-04-19
自然资源部天津海水淡化与综合利用研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the technical problems of the prior art products such as dense cortex or pore size that cannot be adjusted to the ultrafiltration range, poor bonding strength between the cortex and the support layer, and complicated preparation process, the present invention provides a polytetrafluoroethylene hollow fiber composite membrane and its preparation method

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  • Polytetrafluoroethylene hollow fiber composite membrane and preparation method thereof
  • Polytetrafluoroethylene hollow fiber composite membrane and preparation method thereof
  • Polytetrafluoroethylene hollow fiber composite membrane and preparation method thereof

Examples

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Embodiment 1

[0057] The technical process of the preparation of the PTFE hollow fiber composite membrane in this embodiment is according to figure 1 carry out, but this implementation does not involve the hydrophobic finishing step, the specific operation is as follows:

[0058] Step 1. Stretch the PTFE hollow fiber obtained after push molding and heat treatment to remove additives. The stretching ratio is 300%, and the stretching temperature is 30°C. A PTFE hollow fiber membrane is prepared.

[0059] Step 2: Perform dynamic plasma activation treatment on the PTFE hollow fiber membrane prepared by stretching, using a pipeline electrode with a treatment speed of 6m / min, a treatment power of 10kW, and a treatment distance of 3mm, and the electrodes are located in an air atmosphere.

[0060] Step 3, at first, prepare polymer solution: dissolve thermoplastic polyurethane in dimethylformamide solvent, prepare the solution of polymer concentration 15wt%, add the chloroform of polymer solution g...

Embodiment 2

[0063] The preparation process of the PTFE hollow fiber composite membrane of the present embodiment is as follows figure 1 As shown, the specific operation is as follows:

[0064] Step 1, using the same PTFE hollow fiber as in Example 1 step 1 to stretch, the stretching ratio is 600%, and the stretching temperature is 30°C; after stretching, the PTFE hollow fiber membrane is obtained by sintering at 400°C and 1min; further The PTFE hollow fiber membrane is diluted with n-hexane to a perfluorodecyltrichlorosilane hydrophobizing agent with a concentration of 3wt%, soaked at 40°C for 10s, dried and then cooled and wound to prepare a PTFE hollow fiber membrane with stronger hydrophobicity.

[0065] Step 2: Perform dynamic plasma activation treatment on the PTFE hollow fiber membrane, using a pipeline electrode, the treatment speed is 3m / min, the treatment power is 5kW, the treatment distance is 5mm, and the electrode is located in the air atmosphere.

[0066] Step 3, first, prep...

Embodiment 3

[0069] The preparation process of the PTFE hollow fiber composite membrane of the present embodiment is as follows figure 1 As shown, the specific operation is as follows:

[0070] Step 1, using the same PTFE hollow fiber as in Example 1 step 1 to stretch, the stretching ratio is 500%, and the stretching temperature is 30°C; after stretching, sintering and shaping at 380°C for 1min to obtain a PTFE hollow fiber membrane; further The PTFE hollow fiber membrane is dipped in perfluorodecyltriethoxysilane diluted to 0.5wt% with n-hexane, soaked at 40°C for 10s, dried and then cooled to make PTFE hollow fiber with stronger hydrophobicity membrane.

[0071] Step 2, the PTFE hollow fiber membrane is subjected to dynamic plasma activation treatment, the electrode used is a pipeline electrode, the treatment speed is 30m / min, the treatment power is 8kW, the treatment distance is 10mm, and a continuous oxygen concentration of 10v / v% is introduced into the electrode. A mixture of oxygen...

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Abstract

The invention belongs to the technical field of separation membranes, and in particular relates to a polytetrafluoroethylene hollow fiber composite membrane and a preparation method thereof. The composite membrane has a double-layer structure, and the composite membrane includes an outer hydrophilic ultrafiltration skin layer and an inner hydrophobic PTFE support layer, the initial contact angle of the hydrophilic ultrafiltration skin layer is 20°-85°, the thickness of the hydrophilic ultrafiltration skin layer is 2 μm-50 μm, and the microporous structure on the surface is circular and evenly distributed. The average pore diameter of the pores is 5nm-100nm, the cross-section of the hydrophilic ultrafiltration skin layer is a sponge-like hole, the initial contact angle of the hydrophobic PTFE support layer is 108°-158°, and its microporous structure is composed of gaps between fine fibers The formed point-line separation pores have an average pore diameter of 750nm-4000nm and a porosity of 65%-85%. The beneficial effects of the invention are: the polytetrafluoroethylene hollow fiber membrane with composite structure has durable hydrophobicity and high-efficiency separation performance. At the same time, the preparation method of the invention is simple, efficient, economical and environmentally friendly, and the prepared composite membrane has good stability.

Description

technical field [0001] The invention belongs to the technical field of separation membranes, and in particular relates to a microporous separation membrane and a preparation technology thereof, in particular to a polytetrafluoroethylene hollow fiber composite membrane with an asymmetric microporous structure and a preparation method thereof. Background technique [0002] Constructing the asymmetric microporous structure of the PTFE hollow fiber membrane by means of multi-layer composite is an effective method to solve the wide range of pore size distribution and low porosity of the products in the prior art. That is, based on the PTFE hollow fiber membrane prepared by the stretching method, the surface is further modified to obtain a separation layer, so as to realize the precise regulation of the microporous structure and performance of the membrane, and further realize the purpose of precise and efficient separation. At present, the existing technical means include coating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/08B01D71/36B01D67/00B01D69/02B01D61/36
CPCB01D69/12B01D69/08B01D71/36B01D67/0002B01D69/02B01D61/364B01D2325/38
Inventor 刘国昌陈江荣郭春刚李浩车振宁吕经烈
Owner 自然资源部天津海水淡化与综合利用研究所
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