Submicron aperture composite membrane based on heavy ion microporous membrane as well as preparation method and application thereof

Abstract

The invention provides a submicron aperture composite membrane based on a heavy ion microporous membrane, which comprises an ultrathin heavy ion microporous membrane layer and a support layer, the ultrathin heavy ion microporous membrane layer is compounded on the support layer, and the thickness of the ultrathin heavy ion microporous membrane layer is 0.5-2 microns. The composite membrane provided by the invention is thin in thickness, large in flux and good in mechanical property. The preparation method provided by the invention is based on innovation of a traditional method, wherein the supporting layer is added on the heavy ion microporous membrane layer, then compounding is carried out in a hot pressing or glue compounding mode, and then etching and cleaning are carried out, so that the problem that a thin film material is broken and cannot be etched due to the fact that the thin film material is too thin in the etching process can be solved. According to the composite membrane prepared by the method, the separation layer is greatly reduced in thickness (more than 5 microns) compared with a conventional heavy ion microporous membrane, so that the flux can be increased by 2.5-10 times. The method is stable and reliable in production process, and a reliable production technology is provided for application of the heavy ion microporous membrane with the submicron aperture.

Description

technical field

[0001] The invention relates to the field of materials, in particular to a composite membrane with a submicron aperture based on a heavy ion microporous membrane and a preparation method and application thereof. Background technique

[0002] Heavy ion microporous membrane, also known as nuclear pore membrane, is formed by punching holes in plastic film with heavy ions, and then expanding the holes by chemical etching. The pore size of the heavy ion microporous membrane ranges from 0.01 microns to tens of microns. The processing method of the heavy ion microporous membrane includes two steps of ion irradiation and chemical etching.

[0003] The current production method is to irradiate a plastic film with a thickness of more than 5 microns with heavy ions, and then perform chemical etching to obtain a heavy ion microporous membrane with a thickness of more than 5 microns. The plastic film irradiated by heavy ions will form a pore structure during the chemica...

Examples

preparation example Construction

[0033] The present invention provides a kind of preparation method for preparing the above-mentioned submicron pore composite membrane, comprising the following steps:

[0034] Step 1: Prepare materials, prepare ultra-thin heavy ion microporous membrane layer and support layer;

[0035] Step 2: Composite, stack the two layers of materials up and down, and compound the stacked two layers of materials by hot pressing. The hot pressing temperature is 100-280 degrees Celsius, specifically 130-280 degrees Celsius, and the pressure is 0.5-3 kg, specifically 1-2 kg;

[0036] Step 3: Etching. Put the compounded material into etching equipment for chemical etching. The etching solution used is a mixed solution of sodium hydroxide, potassium hydroxide, sodium hypochlorite or sulfuric acid and potassium permanganate. The etching temperature is 20-90 Celsius, specifically 30-40 Celsius, the concentration of the etching solution is 1%-30%, specifically 5%-10%, and the etching time is 10-5...

specific Embodiment 1

[0047] The present embodiment provides a submicron pore composite membrane based on heavy ion microporous membrane, comprising PET ultra-thin heavy ion microporous membrane layer and PET non-woven fabric, and described PET ultrathin heavy ion microporous membrane layer is compounded on PET on non-woven fabric.

[0048] The thickness of PET ultra-thin heavy ion microporous membrane layer is 1 micron, the pore diameter is 1 micron, and the pore density is 1×10 7 per square centimeter, the pore size of the PET non-woven fabric is 40 microns, and the thickness is 50 microns.

[0049] A method for preparing a submicron pore composite membrane based on a heavy ion microporous membrane as described above, comprising the following steps:

[0050] Step 1: Prepare materials, prepare ultra-thin heavy ion microporous membrane layer and support layer;

[0051] Step 2: Composite, stack the two layers of materials up and down together, and compound the stacked two layers of materials by ho...

specific Embodiment 2

[0055] This embodiment provides a submicron pore composite membrane based on the heavy ion microporous membrane, including PP ultra-thin heavy ion microporous membrane layer and PP non-woven fabric, and the PP ultrathin heavy ion microporous membrane layer is compounded on PP on non-woven fabric.

[0056] The thickness of the PP ultra-thin heavy ion microporous membrane layer is 0.5 microns, the pore diameter is 0.22 microns, and the pore density is 3×10 8 per square centimeter, the pore size of the PP non-woven fabric is 30 microns, and the thickness is 100 microns.

[0057] A method for preparing a submicron pore composite membrane based on a heavy ion microporous membrane as described above, comprising the following steps:

[0058] Step 1: Prepare materials, prepare ultra-thin heavy ion microporous membrane layer and support layer;

[0059] Step 2: Composite, stack the two layers of materials up and down, and compound the stacked two layers of materials by hot pressing. T...

technical field

[0001] The invention relates to the field of materials, in particular to a composite membrane with a submicron aperture based on a heavy ion microporous membrane and a preparation method and application thereof. Background technique

[0002] Heavy ion microporous membrane, also known as nuclear pore membrane, is formed by punching holes in plastic film with heavy ions, and then expanding the holes by chemical etching. The pore size of the heavy ion microporous membrane ranges from 0.01 microns to tens of microns. The processing method of the heavy ion microporous membrane includes two steps of ion irradiation and chemical etching.

[0003] The current production method is to irradiate a plastic film with a thickness of more than 5 microns with heavy ions, and then perform chemical etching to obtain a heavy ion microporous membrane with a thickness of more than 5 microns. The plastic film irradiated by heavy ions will form a pore structure during the chemica...

Examples

preparation example Construction

[0033] The present invention provides a kind of preparation method for preparing the above-mentioned submicron pore composite membrane, comprising the following steps:

[0034] Step 1: Prepare materials, prepare ultra-thin heavy ion microporous membrane layer and support layer;

[0035] Step 2: Composite, stack the two layers of materials up and down, and compound the stacked two layers of materials by hot pressing. The hot pressing temperature is 100-280 degrees Celsius, specifically 130-280 degrees Celsius, and the pressure is 0.5-3 kg, specifically 1-2 kg;

[0036] Step 3: Etching. Put the compounded material into etching equipment for chemical etching. The etching solution used is a mixed solution of sodium hydroxide, potassium hydroxide, sodium hypochlorite or sulfuric acid and potassium permanganate. The etching temperature is 20-90 Celsius, specifically 30-40 Celsius, the concentration of the etching solution is 1%-30%, specifically 5%-10%, and the etching time is 10-5...

specific Embodiment 1

[0047] The present embodiment provides a submicron pore composite membrane based on heavy ion microporous membrane, comprising PET ultra-thin heavy ion microporous membrane layer and PET non-woven fabric, and described PET ultrathin heavy ion microporous membrane layer is compounded on PET on non-woven fabric.

[0048] The thickness of PET ultra-thin heavy ion microporous membrane layer is 1 micron, the pore diameter is 1 micron, and the pore density is 1×10 7 per square centimeter, the pore size of the PET non-woven fabric is 40 microns, and the thickness is 50 microns.

[0049] A method for preparing a submicron pore composite membrane based on a heavy ion microporous membrane as described above, comprising the following steps:

[0050] Step 1: Prepare materials, prepare ultra-thin heavy ion microporous membrane layer and support layer;

[0051] Step 2: Composite, stack the two layers of materials up and down together, and compound the stacked two layers of materials by ho...

specific Embodiment 2

[0055] This embodiment provides a submicron pore composite membrane based on the heavy ion microporous membrane, including PP ultra-thin heavy ion microporous membrane layer and PP non-woven fabric, and the PP ultrathin heavy ion microporous membrane layer is compounded on PP on non-woven fabric.

[0056] The thickness of the PP ultra-thin heavy ion microporous membrane layer is 0.5 microns, the pore diameter is 0.22 microns, and the pore density is 3×10 8 per square centimeter, the pore size of the PP non-woven fabric is 30 microns, and the thickness is 100 microns.

[0057] A method for preparing a submicron pore composite membrane based on a heavy ion microporous membrane as described above, comprising the following steps:

[0058] Step 1: Prepare materials, prepare ultra-thin heavy ion microporous membrane layer and support layer;

[0059] Step 2: Composite, stack the two layers of materials up and down, and compound the stacked two layers of materials by hot pressing. T...

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