Preparation method of porous nickel flat membrane and porous nickel flat membrane prepared by the method

Abstract

The invention discloses a porous nickel flat sheet membrane preparation method and a porous nickel flat sheet membrane prepared by using same. The method comprises the following steps: 1) preparing a casting membrane solution, wherein a formula of the casting membrane solution comprises: 30-70% of nickel powder with a particle size range of 0.5-50 microns, 3-7% of a binder, 0-1% of a thickener and the balance of a solvent; and the binder is selected from one or more of polyacrylonitrile, polysulfone and polyether sulfone; 2) scraping the membrane, wherein a wet membrane is prepared from the casting membrane solution obtained in the step 1) by adopting a membrane scraping method, the prepared formed wet membrane is soaked into water until a solvent is sufficiently separated out, and the wet membrane is dried in air to obtain a to-be-sintered membrane; and 3), sintering, wherein the to-be-sintered membrane obtained in the step 2) is roasted, the temperature increasing rate is 1-10 DEG C / min during sintering, the highest sintering temperature is 700-1000 DEG C, and the porous nickel flat sheet membrane is obtained by naturally cooling after reaching the highest sintering temperature and preserving the temperature for 0-120 minutes.

Description

technical field

[0001] The invention relates to the field of porous metal materials, in particular to a method for porous nickel membranes. Background technique

[0002] Porous metal membranes are materials that rely on the gaps between powder particles to separate substances, and the common pore size ranges from 0.1 μm to 10 μm. Porous metal membranes originated in the 1940s, and stainless steel membranes developed rapidly in the 1990s, and were later used as separation membranes due to their superior performance.

[0003] The porous metal membrane integrates the large porosity and specific surface area of ​​the porous metal. The characteristics of the metal make it have the advantages of high strength and easy cleaning of the ceramic membrane, so it can be used in membrane separation. It has functional characteristics that ordinary metal materials or other separation membranes do not have in terms of chemistry and thermodynamics, and has broad application prospects. [0...

Examples

preparation example Construction

[0035] The method for preparing a porous nickel flat membrane provided in this specific embodiment comprises the following steps

[0036] A method for preparing a porous nickel flat film, characterized in that the method comprises the following steps

[0037] 1) Preparation of casting solution

[0038] All components in the formulation of the casting solution were mixed first, then ultrasonically oscillated for 30 minutes, then heated in a water bath to 50° C. and stirred until uniformly mixed to obtain the casting solution.

[0039] 2) Scratch film

[0040] The casting solution obtained in step 1) is used to prepare a wet film by scraping the film, and the formed wet film is soaked in water until the solvent is fully separated out, and then dried to obtain a film to be sintered.

[0041] 3) Sintering

[0042] The film to be sintered obtained in step 2) is sintered to obtain the film to be cleaned, and the heating rate during sintering is V°C / min;

[0043] When the sinteri...

Embodiment 1～6

[0049] The formula of embodiment 1~6 and the wet film thickness that make see table 1 below

[0050] The formula of table 1 embodiment 1~6 and the wet film thickness that makes

[0051]

[0052] Step 3) of all embodiments 1~6 Concrete sintering process is as follows table 2:

[0053] The formula of table 2 embodiment 1~6, technology and the wet film thickness that make

[0054]

[0055]

[0056] Note: During the sintering process of Examples 2-4, the sintering temperature reached T 1 All adopt same sintering atmosphere before and after, wherein reach T in embodiment 4 1 The heating rate before was 2°C / min, and then the heating rate was 5°C / min.

[0057] When DMF, EC, and DMAc are used to replace NMP in the examples, a porous nickel flat film can also be obtained.

[0058] The surface scanning electron microscope picture of the porous flat membrane that embodiment 1 obtains is as figure 1 shown.

[0059] The cross-sectional scanning electron microscope figure of ...

technical field

[0001] The invention relates to the field of porous metal materials, in particular to a method for porous nickel membranes. Background technique

[0002] Porous metal membranes are materials that rely on the gaps between powder particles to separate substances, and the common pore size ranges from 0.1 μm to 10 μm. Porous metal membranes originated in the 1940s, and stainless steel membranes developed rapidly in the 1990s, and were later used as separation membranes due to their superior performance.

[0003] The porous metal membrane integrates the large porosity and specific surface area of ​​the porous metal. The characteristics of the metal make it have the advantages of high strength and easy cleaning of the ceramic membrane, so it can be used in membrane separation. It has functional characteristics that ordinary metal materials or other separation membranes do not have in terms of chemistry and thermodynamics, and has broad application prospects. [0...

Examples

preparation example Construction

[0035] The method for preparing a porous nickel flat membrane provided in this specific embodiment comprises the following steps

[0036] A method for preparing a porous nickel flat film, characterized in that the method comprises the following steps

[0037] 1) Preparation of casting solution

[0038] All components in the formulation of the casting solution were mixed first, then ultrasonically oscillated for 30 minutes, then heated in a water bath to 50° C. and stirred until uniformly mixed to obtain the casting solution.

[0039] 2) Scratch film

[0040] The casting solution obtained in step 1) is used to prepare a wet film by scraping the film, and the formed wet film is soaked in water until the solvent is fully separated out, and then dried to obtain a film to be sintered.

[0041] 3) Sintering

[0042] The film to be sintered obtained in step 2) is sintered to obtain the film to be cleaned, and the heating rate during sintering is V°C / min;

[0043] When the sinteri...

Embodiment 1～6

[0049] The formula of embodiment 1~6 and the wet film thickness that make see table 1 below

[0050] The formula of table 1 embodiment 1~6 and the wet film thickness that makes

[0051]

[0052] Step 3) of all embodiments 1~6 Concrete sintering process is as follows table 2:

[0053] The formula of table 2 embodiment 1~6, technology and the wet film thickness that make

[0054]

[0055]

[0056] Note: During the sintering process of Examples 2-4, the sintering temperature reached T 1 All adopt same sintering atmosphere before and after, wherein reach T in embodiment 4 1 The heating rate before was 2°C / min, and then the heating rate was 5°C / min.

[0057] When DMF, EC, and DMAc are used to replace NMP in the examples, a porous nickel flat film can also be obtained.

[0058] The surface scanning electron microscope picture of the porous flat membrane that embodiment 1 obtains is as figure 1 shown.

[0059] The cross-sectional scanning electron microscope figure of ...

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