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Hollow fiber membrane of gradient pore structure

A gradient pore, fiber membrane technology, applied in the field of hollow fiber membranes, can solve the problems such as the need to strengthen the anti-pollution ability of the hollow fiber membrane and the insufficient protection of the hollow fiber membrane, achieve stable and durable strength and anti-pollution ability, improve filtration efficiency, increase Effects of Surface Area and Water Flux

Pending Publication Date: 2019-09-17
WUHAN TEXTILE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the nanofibers added in this method are mainly used to support the hollow fiber membrane, and the protection of the surface of the hollow fiber membrane is insufficient, the anti-pollution ability of the prepared hollow fiber membrane still needs to be strengthened.

Method used

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  • Hollow fiber membrane of gradient pore structure
  • Hollow fiber membrane of gradient pore structure
  • Hollow fiber membrane of gradient pore structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a hollow fiber membrane with a gradient pore structure, in which thermoplastic nanofibers are coated on the surface of the hollow fiber membrane as a skin structure, and the hollow fiber membrane is a core structure; the pore size of the thermoplastic nanofiber layer is larger than that of the hollow fiber The pore size of the membrane wall layer has a gradient distribution in the longitudinal direction as a whole.

[0030] Wherein, the thermoplastic nanofibers are PVA-co-PE thermoplastic nanofibers; the hollow fiber membranes are polysulfone hollow fiber membranes.

[0031] A method for preparing a hollow fiber membrane with a gradient pore structure described in this embodiment comprises the following steps:

[0032] (1) Preparation of PVA-co-PE thermoplastic nanofibers by melt blending phase separation method: PVA-co-PE and cellulose acetate butyrate (CAB) were uniformly mixed at a mass ratio of 2:3, and processed at a temperature of 120 ° C ...

Embodiment 2～7

[0036] Embodiments 2 to 7 provide a hollow fiber membrane with a gradient pore structure. Compared with Embodiment 1, the difference is that the temperature of the thermoplastic nanofiber in the mixed solution of isopropanol and deionized water in step (2) is changed. Concentration and the addition amount of crosslinking agent, the concentration of the thermoplastic nanofiber corresponding to each embodiment and the addition amount of crosslinking agent are as shown in table 1:

[0037] The concentration of thermoplastic nanofibers corresponding to each embodiment of table 1 and the addition amount of crosslinking agent

[0038]

[0039] According to the concentration of thermoplastic nanofibers shown in Table 1 and the amount of cross-linking agent added, according to the preparation method of Example 1, hollow fiber membranes with gradient pore structures in Examples 2 to 7 were respectively prepared. The hollow fiber membranes have a certain gradient pore structure, whic...

Embodiment 8～12

[0043] Examples 8-12 provide a hollow fiber membrane with gradient pore structure. Compared with Example 1, the difference is that the dipping time and drying temperature in step (3) are changed. The glue time and drying temperature are shown in Table 2:

[0044] The dipping time and drying temperature corresponding to each embodiment of table 2

[0045] Example Dipping time (h) Drying temperature (℃) Example 8 1 20 Example 9 2 40 Example 10 3 60 Example 11 2 80 Example 12 3 100

[0046] According to the dipping time and drying temperature shown in Table 2, according to the preparation method of Example 1, hollow fiber membranes with gradient pore structures in Examples 8 to 12 were prepared respectively, and the hollow fiber membranes prepared in each example had The pore structure of a certain gradient shows that when the dipping time and drying temperature are changed within a certain range, hollow fiber membranes with g...

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Abstract

The invention discloses a hollow fiber membrane of a gradient pore structure. The hollow fiber membrane of the gradient pore structure is formed by coating a hollow fiber membrane by a thermoplastic nanofiber, the hollow fiber membrane is adopted as a core-layer structure, the thermoplastic nanofiber is adopted as a surface-layer structure for covering the surface of the hollow fiber membrane, in addition, the aperture of a thermoplastic nanofiber layer is larger than that of a hollow fiber membrane wall layer, and the apertures are in gradient distortion in a longitudinal direction; as the hollow fiber membrane is dipped into a thermoplastic nanofiber suspension with a cross-linking agent, and the surface of the hollow fiber membrane is uniformly coated by the thermoplastic nanofiber layer, the specific surface area and the water flux of the hollow fiber membrane are increased, the filtering efficiency of the hollow fiber membrane is improved, the strength and the anti-contamination capability of the hollow fiber membrane are improved, the service life of the hollow fiber membrane is prolonged, the hollow fiber membrane of the gradient pore structure with excellent properties is prepared, and in addition, the hollow fiber membrane is simple in process, easy to control, low in cost and wide in application prospects.

Description

technical field [0001] The invention relates to the field of modification of hollow fiber membranes, in particular to a hollow fiber membrane with gradient pore structure. Background technique [0002] Hollow fiber membrane is a self-supporting fibrous membrane, which is an important aspect of membrane separation technology. Compared with other classified membranes, it has the advantages of small volume, strong self-supporting ability, and high packing density, so it is widely used It is widely used in chemical industry, environmental protection, medicine, biology, textile and other fields, and its application in the field of sewage treatment is particularly important, which is of great significance to solve the problems of water pollution and water resource shortage. Hollow fiber membranes are mainly used as filtration membranes in sewage treatment. With the increase of their usage rate, some impurities in water will gradually adhere to the surface of the membranes, and at ...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D67/00B01D69/02
CPCB01D67/0006B01D67/0093B01D69/02B01D69/08B01D2325/02B01D2325/24
Inventor 刘轲郭启浩王栋李沐芳赵青华蒋海青
Owner WUHAN TEXTILE UNIV
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