Inorganic composite film

Abstract

The utility model discloses an inorganic composite film. More specifically, the composite membrane is of a three-layer structure, the bottom supporting layer is a microporous inorganic membrane, the middle transition layer is a metal or alloy transition layer, and the uppermost ultrathin functional layer is a metal oxide which is formed by oxidizing the transition layer and has adjustable density and thickness.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of composite film structure, specifically, relate to an inorganic composite film. BACKGROUND

[0002] The application range of separation membrane is from water treatment, gas separation not involving phase change, pervaporation, membrane distillation involving phase change to membrane reactor involving reaction, among which the high polymer material separation membrane has a longer history, a more mature technology, the largest application field and market influence, especially in the seawater desalination and brackish water desalination field still plays an irreplaceable role of inorganic membrane, but with the expansion of the application field, its shortcomings are more and more concerned, such as its poor high temperature resistance, poor solvent resistance, poor mechanical property and easy bacterial growth, and the inorganic membrane is more and more widely used under the severe water supply condition due to its excellent stability and mechanical property. At present, the separation function layer of the inorganic membrane technology applied in the water treatment field usually adopts the particle calcination technology and sol-gel technology etc. which cannot consider the optimization of the thickness, density and other chemical structures of the function layer, thereby limiting its application and popularization in some fields, especially in the reverse osmosis and nanofiltration fields controlled by the polymer membrane. SUMMARY

[0003] The utility model discloses in order to overcome the deficiency in the prior art, propose a kind of inorganic composite film, by regulating and controlling the physical chemistry structure of function layer to separate different components, expand the application field of inorganic membrane.

[0004] To achieve the above-mentioned purposes, the technical scheme adopted by the utility model technology is:

[0005] An inorganic composite membrane, characterized in that: the composite film is a three-layer structure, the bottom support layer is a microporous inorganic membrane, the intermediate transition layer is a metal or metal alloy film, and the top functional layer is a metal oxide with adjustable density and thickness formed by oxidation of the transition layer itself.

[0006] Further, the pore size of the microporous inorganic membrane in the bottom support layer is 10-500 microns.

[0007] Further, the metal of the intermediate transition layer is deposited on the surface of the microporous support layer by PVD, CVD, chemical plating, electroplating and other technologies, and the pore size after deposition is 100 nanometers-10 microns.

[0008] By adopting the above technical scheme, the utility model can obtain the following beneficial effects: the physical and chemical structure of the functional layer metal oxide can be optimized, and the application field of the inorganic membrane can be expanded. BRIEF DESCRIPTION OF DRAWINGS

[0009] The utility model discloses in the following in conjunction with the drawings and specific embodiment carries out detailed explanation to the technology, need to explain that the hole, porosity, thickness and proportion in the schematic diagram do not represent the real structure, only for the convenience of the explanation process implementation.

[0010] Figure 1 It is the cross section structure schematic drawing of inorganic composite film involved in the utility model.

[0011] Among them: 1 is microporous inorganic support film, 2 is metal or alloy transition layer, 3 is metal oxide functional layer.

[0012] Now combine the schematic diagram to explain the process in detail. Figure 2 It is the cross section diagram of inorganic microporous support layer prepared by the existing mature technology, wherein 1 is inorganic material, and 4 is a hole. Figure 3 It is the plan view thereof. Figure 4 It is the cross section diagram after metal deposition, Figure 5 It is the plan view thereof, wherein the new hole 5 is a greatly reduced hole after metal deposition, which is close to the surface, and the hole will be smaller due to more deposition. Figure 6 It is the plan view after the oxidation of the metal itself, wherein 6 is a dense metal oxide functional classification layer formed by oxidation on the basis of the original hole 4 and the hole 5 after metal deposition. Specific embodiments

[0013] Example 1: the porous support layer is stainless steel material, the average pore size is 100 microns, after cleaning and drying, pure metal aluminum is deposited on the surface and in the hole of the above porous stainless steel support layer by using PVD sputtering technology, the surface pore size is controlled to be about 30 microns or so, is placed in humid air with humidity of 90%, is heated to 300 degrees, and the time is controlled to make the above hole completely closed, and whether the hole is completely closed is judged by using whether the protein interception rate of 500ppm egg white protein aqueous solution is greater than 20% as a criterion.

[0014] Example 2: the same as example 1, the oxidation technology adopts anodic oxidation technology, after the above hole is completely closed by controlling the current and time, a double time is added, and the film density is appropriately increased.

[0015] Example 3: ceramic microporous membrane prepared by solid particle sintering is used as the support layer, the average pore size is 1 micron, metal copper is plated on the surface and in the hole by using chemical plating technology, the surface hole is reduced to about 20 nanometers, is placed in humid air with humidity of 90%, is heated to 300 degrees, and the time is controlled to make the above hole completely closed.

[0016] Example 4: The porous support layer is stainless steel material, the average pore size is 100 microns, after cleaning and drying, pure metal titanium is deposited on the surface and in the pores of the porous stainless steel support layer by PVD sputtering technology, the surface pore size is controlled to be about 30 microns, the oxidation technology is anodic oxidation technology, the time and current are controlled to make the pores completely closed, the time is continuously increased to increase the density of the functional layer and reduce the pore size.

[0017] Example 5: The porous support layer is stainless steel material, the average pore size is 100 microns, after cleaning and drying, pure metal aluminum-copper alloy is deposited on the surface and in the pores of the porous stainless steel support layer by PVD sputtering technology, the surface pore size is controlled to be about 30 microns, and then the porous support layer is placed in a passivation liquid to control the time to make the pores completely closed.

[0018] Finally, it should be noted that the above only describes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An inorganic composite film, characterized by: The composite film is a three-layer structure, the bottom supporting layer is a microporous inorganic film, the middle transition layer is a metal or metal alloy film, and the upper functional layer is a metal oxide with adjustable density and thickness formed by oxidation of the transition layer itself.

2. The inorganic composite film according to claim 1, wherein The microporous inorganic film in the bottom supporting layer has a pore size of 10-500 microns.

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