High-intensity ternary gradient structure PVDF tubular ultrafilter membrane and preparation method

A technology of tubular ultrafiltration membrane and gradient structure, which is applied in the field of high-strength ternary gradient structure PVDF tubular ultrafiltration membrane and its preparation, and can solve the problem of loose bonding between the support layer and the separation layer, uneven porosity, and low bonding strength and other problems, to achieve the effect of good application prospects, large flux and long service life

Active Publication Date: 2016-02-24
广东华凯明信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The filter membrane prepared by sintering has the characteristics of high strength and large porosity, but there are problems such as uneven porosity and small pores are not easy to form
[0008] At present, most PVDF tubular membranes use a composite process of smearing a separation layer on the support material. The support layer and the separation layer are not tightly bonded, and the bo

Method used

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  • High-intensity ternary gradient structure PVDF tubular ultrafilter membrane and preparation method
  • High-intensity ternary gradient structure PVDF tubular ultrafilter membrane and preparation method
  • High-intensity ternary gradient structure PVDF tubular ultrafilter membrane and preparation method

Examples

Experimental program
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Example Embodiment

[0034] Example 1

[0035] (1) Pour the PVDF powder with a particle size of 200 meshes into a stainless steel tubular mold with an inner tube and an outer tube, and control the thickness of the support layer to be 2mm by adjusting the gap between the inner diameter of the outer tube and the outer diameter of the inner tube. Under 10MPa pressure conditions and High-temperature sintering at 180°C for 1 hour, cooling to room temperature at a rate of 10°C / min, and exiting the mold to form a support layer tubular prefabricated body with a one-layer structure.

[0036](2) Pour the PVDF powder with a particle size of 600 meshes into the transition layer sintering mold. The transition layer sintering mold is based on the inner layer of the support layer tubular prefabricated body as the outer layer of the transition layer, and uses a stainless steel tube with an outer diameter smaller than the tubular prefabricated body As the inner tube mold for transition layer sintering, adjust the ...

Example Embodiment

[0039] Example 2

[0040] (1) Pour the PVDF powder with a particle size of 200 meshes into a stainless steel tubular mold with an inner tube and an outer tube, and control the thickness of the support layer to be 2mm by adjusting the gap between the inner diameter of the outer tube and the outer diameter of the inner tube. Under 10MPa pressure conditions and High-temperature sintering at 180°C for 1 hour, cooling to room temperature at a rate of 10°C / min, and exiting the mold to form a support layer tubular prefabricated body with a one-layer structure.

[0041] (2) Pour the PVDF powder into the transition layer sintering mold with a particle size of 400 meshes. The transition layer sintering mold is based on the inner layer of the support layer tubular prefabricated body as the outer layer of the transition layer, and the outer diameter is less than the stainless steel tube of the tubular prefabricated body As the inner tube mold for transition layer sintering, adjust the dif...

Example Embodiment

[0044] Example 3

[0045] (1) Pour the PVDF powder with a particle size of 100 mesh into a stainless steel tubular mold with an inner tube and an outer tube, and control the thickness of the support layer to be 2mm by adjusting the gap between the inner diameter of the outer tube and the outer diameter of the inner tube. Under 10MPa pressure conditions and High-temperature sintering at 180°C for 1 hour, cooling to room temperature at a rate of 10°C / min, and exiting the mold to form a support layer tubular prefabricated body with a one-layer structure.

[0046] (2) Pour the PVDF powder into the transition layer sintering mold with a particle size of 400 meshes. The transition layer sintering mold is based on the inner layer of the support layer tubular prefabricated body as the outer layer of the transition layer, and the outer diameter is less than the stainless steel tube of the tubular prefabricated body As the inner tube mold for transition layer sintering, adjust the diffe...

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Abstract

The invention belongs to the membrane separation material technology field, and discloses a high-intensity ternary gradient structure PVDF tubular ultrafilter membrane and a preparation method. The preparation method is as follows: PVDF powder is sintered in a tubular die, and a support layer tubular prefabricated body with a one-layer structure is formed; then PVDF powder is sintered with the prefabricated body as an outer layer, and a binary PVDF tubular base membrane with a binary gradient structure is formed; then a chemical-bonding functional Al2O3/PVDF casting membrane solution is employed to carry out coating membrane forming on the inner surface of the tubular base membrane, a separation layer is formed, and a high-intensity ternary gradient structure PVDF tubular ultrafilter membrane is prepared. The provided ultrafilter membrane is prepared through forming methods for three times, the three structures are combined tightly, the provided ultrafilter membrane has advantages of pore diameter gradient distribution, low resistance, large flux, easy reverse cleaning and the like, the mechanical properties and separation performance of the provided ultrafilter membrane are raised greatly, and the provided ultrafilter membrane has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of membrane separation materials, and in particular relates to a high-strength ternary gradient structure PVDF tubular ultrafiltration membrane and a preparation method. Background technique [0002] Membrane separation is a technical means for material separation, concentration and purification. The membrane separation process uses external energy as the driving force, and selectively transmits different substances through the selective permeable membrane, so as to realize the separation, enrichment and purification of liquid or gas mixtures of multiple components. The membrane separation process is relatively simple, less polluting, energy-saving and efficient, can be operated at room temperature, and there is no phase change in the separation process, so it is especially suitable for the separation and concentration of biologically active or heat-sensitive substances. [0003] In industry, membrane separ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/04
CPCB01D67/0004B01D67/0006B01D67/0013B01D67/002B01D67/0079B01D69/046B01D71/34B01D2325/24
Inventor 肖凯军何其银玉容朱良申益
Owner 广东华凯明信科技有限公司
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