Polyvinylidene fluoride filtering membrane as well as preparation method and application thereof

A polyvinylidene fluoride and filtration membrane technology, applied in the field of filtration, can solve the problems of small water contact angle and poor filtration performance, and achieve the effects of increasing water contact angle, enhancing oil filtration effect and low cost

Pending Publication Date: 2022-07-05
深圳维度新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present application provides a polyvinylidene fluoride filter membrane and its preparation method and application to solve the problem of poor filtration performance of the existing nanofiber filter membrane due to the small water contact angle

Method used

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  • Polyvinylidene fluoride filtering membrane as well as preparation method and application thereof
  • Polyvinylidene fluoride filtering membrane as well as preparation method and application thereof
  • Polyvinylidene fluoride filtering membrane as well as preparation method and application thereof

Examples

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preparation example Construction

[0026] The embodiment of the present application provides a preparation method of a polyvinylidene fluoride filter membrane, such as figure 1 As shown, the preparation method of polyvinylidene fluoride filter membrane comprises the following steps:

[0027] S100, mixing acetone with a preset solvent capable of dissolving polyvinylidene fluoride to obtain a mixed solvent, and the mass fraction of acetone in the mixed solvent is 3% to 90%;

[0028] S200, dissolving polyvinylidene fluoride (ie PVDF) in a mixed solvent to obtain a polyvinylidene fluoride solution, and the mass concentration of the polyvinylidene fluoride solution is 3% to 40%;

[0029] S300, spinning the polyvinylidene fluoride solution by a solution jet spinning process to obtain a polyvinylidene fluoride filter membrane.

[0030] In the method for preparing a polyvinylidene fluoride filter membrane provided in the embodiment of the present application, a mixed solvent formed by mixing acetone and a preset solve...

Embodiment 1

[0045] A preparation method of polyvinylidene fluoride filter membrane comprises the following steps:

[0046] S101, uniformly mixing 7.5g DMF and 0.4g acetone to obtain a mixed solvent;

[0047] S102, adding 2.5 g of polyvinylidene fluoride to the mixed solvent, and stirring at a temperature of 60° C. at a speed of 800 rpm for 1 h to obtain a polyvinylidene fluoride solution:

[0048] S103, spinning the polyvinylidene fluoride solution by a solution jet spinning process to obtain a polyvinylidene fluoride filter membrane; during spinning, the distance between the spinneret and the receiver is 20cm, and the airflow velocity of the compressed air is 40m / s, the extrusion speed of the spinneret was 5 mL / h.

Embodiment 2

[0050] A preparation method of polyvinylidene fluoride filter membrane comprises the following steps:

[0051] S201, uniformly mixing 7.5g DMF and 0.6g acetone to obtain a mixed solvent;

[0052] S202, adding 2.5 g of polyvinylidene fluoride to the mixed solvent, and stirring at a temperature of 60° C. at a speed of 800 rpm for 1 h to obtain a polyvinylidene fluoride solution:

[0053] S203, spinning the polyvinylidene fluoride solution by a solution jet spinning process to obtain a polyvinylidene fluoride filter membrane; during spinning, the distance between the spinneret and the receiver is 20cm, and the airflow velocity of the compressed air is 40m / s, the extrusion speed of the spinneret was 5 mL / h.

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Abstract

The invention provides a polyvinylidene fluoride filter membrane as well as a preparation method and application thereof. The preparation method of the polyvinylidene fluoride filtering membrane comprises the following steps that acetone and a preset solvent capable of dissolving polyvinylidene fluoride are mixed, a mixed solvent is obtained, and the mass fraction of acetone in the mixed solvent is 3%-90%; polyvinylidene fluoride is dissolved in a mixed solvent, a polyvinylidene fluoride solution is obtained, and the mass concentration of the polyvinylidene fluoride solution is 3%-40%; and spinning the polyvinylidene fluoride solution by adopting a solution jet spinning process to obtain the polyvinylidene fluoride filter membrane. After the polyvinylidene fluoride is dissolved by adopting the mixed solvent formed by mixing the acetone and the preset solvent capable of dissolving the polyvinylidene fluoride, the polyvinylidene fluoride solution is spun by adopting a solution jet spinning process to form the polyvinylidene fluoride filter membrane, and the surface appearance of the polyvinylidene fluoride filter membrane can be changed by adding the volatile acetone, so that the surface appearance of the polyvinylidene fluoride filter membrane can be changed. The water contact angle of the polyvinylidene fluoride filtering membrane is increased, the hydrophobic lipophilicity of the polyvinylidene fluoride filtering membrane is enhanced, and the oil filtering effect is enhanced.

Description

technical field [0001] The present application belongs to the technical field of filtration, and in particular relates to a polyvinylidene fluoride filter membrane and a preparation method and application thereof. Background technique [0002] Seawater oil pollution has become a problem that endangers the global ecology, and oil-water separation technology is very important to solve the problem of seawater oil pollution. At present, nanofiber filtration membrane is usually used for oil-water separation, which has low cost and simple preparation method, and has relatively broad commercial prospects. However, the existing nanofiber filtration membrane has the defect of small water contact angle, which leads to poor oil filtration performance of the filtration membrane and affects the oil-water separation effect. SUMMARY OF THE INVENTION [0003] The embodiments of the present application provide a polyvinylidene fluoride filter membrane and a preparation method and applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/34B01D69/02B01D61/00B01D17/02
CPCB01D67/0002B01D71/34B01D69/02B01D61/00B01D17/085B01D17/02B01D2323/04B01D2325/38
Inventor 李勃刘奕博王峰张晗莫宏宇
Owner 深圳维度新材料有限公司
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