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Composite porous structure preparation method and composite porous structure

A porous structure and porous substrate technology, applied in chemical instruments and methods, membrane, semi-permeable membrane separation, etc., can solve the problems of different pore sizes, poor blocking efficiency, shortened preparation time, etc.

Active Publication Date: 2019-09-20
EXTREMEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation of porous films by thermal spraying method can simplify the film-making procedure and greatly shorten the preparation time, however, the porous films prepared by the existing thermal spraying method have different pore sizes, and the pore size distribution is too wide, resulting in barriers. Poor efficiency

Method used

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  • Composite porous structure preparation method and composite porous structure
  • Composite porous structure preparation method and composite porous structure
  • Composite porous structure preparation method and composite porous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] First, see figure 1 In step (a1), a hollow tubular porous substrate 10 is prepared, which has a tube wall 101, an axial channel 102, and a plurality of holes 103. The axial channel 102 is formed in the tube wall 101, and The holes 103 are recessed and formed on the tube wall 101. The tube wall 101 has a first surface 1011 (that is, the inner wall surface) and a second surface 1012 (that is, the outer wall surface) opposite to the first surface 1011. The tube wall 101 has a thickness of 2.5 mm, a length of 300 mm, and an inner diameter of 29.5mm, the outer diameter is 30mm. The porous substrate 10 is made of stainless steel, and the average pore diameter of the pores 103 is 3 μm.

[0048] Subsequently, in step (a2), the porous substrate 10 is immersed in a tank containing deionized water, and the plurality of holes 103 of the porous substrate 10 are filled with the deionized water.

[0049] Next, see figure 1 In step (b), a cooling fluid 30 at a flow rate of 3L / min and a te...

Embodiment 2

[0053] The steps of the preparation method of Example 2 are similar to those of the preparation method of Example 1, with the difference that: Example 2 repeats step (b) 5 times in total. The preparation method of Example 2 obtains a composite porous structure, which includes a porous substrate and a coating with a plurality of micropores formed on the second surface of the porous substrate, and the average thickness of the coating is 48 μm The average pore diameter of the micropores of the coating is about 0.32μm, and the pore size distribution is as follows image 3 As shown, the number of micropores with a pore diameter greater than 0.35 μm accounts for only 2.7% of the total number of micropores. In addition, the barrier efficiency of the composite porous structure prepared in this embodiment against 0.2 μm polystyrene standard particles is 99%.

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Abstract

The invention provides a composite porous structure preparation method and a composite porous structure. The preparation method comprises: (a) preparing a porous substrate having a plurality of pores, wherein the porous substrate has opposite first and second surfaces; and (b) continuously introducing a cooling fluid to make the cooling fluid contact the first surface of the porous substrate and reach the second surface through the holes, simultaneously making a coating raw material form a plurality of molten particles by using a heat source, and spraying the molten particles to the second surface of the porous substrate to form a coating having a plurality of micropores on the second surface of the porous substrate so as to obtain the composite porous structure, wherein the coating raw material is an organic polymer coating raw material or inorganic coating raw material. The present invention further provides the composite porous structure prepared by the method.

Description

Technical field [0001] The invention relates to a composite porous structure and a preparation method thereof, in particular to a composite porous structure used for membrane separation and a preparation method thereof. Background technique [0002] Membrane separation technology uses the difference of substances passing through the membrane to achieve separation, concentration or purification under the existence of driving force. It has the advantages of high selectivity, simple operation, energy saving and easy amplification, so it has been widely used in recent years. The demand for applications in various industries, especially precision chemical industry, food industry, pollution prevention, biomedical engineering and biotechnology, is growing rapidly. [0003] The particle size that can be blocked by the porous film is divided into: microfiltration, ultrafiltration, nanofiltration and reverse osmosis. Microfiltration (MF) uses a porous membrane with membrane pores ranging fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/04
CPCB01D67/0088B01D69/04B01D2323/26
Inventor 李雨霖康朝翔
Owner EXTREMEM INC