Composite nuclear track membrane and preparation method thereof

A technology of nuclear pore membrane and composite core, which is applied in the field of composite nuclear pore membrane and its preparation, can solve the problems of poor hydrophilicity, thin film and low mechanical strength, achieve good hydrophilicity, solve the problem of pre-filtration, The effect of strong dirt holding capacity

Active Publication Date: 2014-08-27
天津理源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the deficiencies of thin film, low mechanical strength and poor hydrophilicity in the prior art, and provide a composite nuclear pore membrane

Method used

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  • Composite nuclear track membrane and preparation method thereof
  • Composite nuclear track membrane and preparation method thereof

Examples

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Embodiment 1

[0022] A preparation method of a composite nuclear pore membrane, comprising the following steps: dissolving diester acid cellulose in a mixed solvent under stirring at room temperature to make a solution with a mass percentage of 8%, adding glycerin to make a casting solution , the mass ratio of glycerol to cellulose diester is 3.6:1, the casting solution is left to stand for 1 hour, and the casting solution is coated on the polyester nuclear pore membrane with a thickness of 400 μm on a constant temperature and humidity coating machine, The length of the coating machine is 60 meters. Under the conditions of 60°C and relative humidity of 99%, the coating speed is 1.5 m / min and it is treated for 40 minutes. It is placed in deionized water in a constant temperature water bath, soaked at room temperature for 1 hour, and dried to obtain A composite nuclear pore membrane with a thickness of 160 μm, the mixed solvent is acetone and dimethylformamide with a volume ratio of 0.62:1; th...

Embodiment 2

[0027] A method for preparing a composite nuclear pore membrane, comprising the steps of: dissolving diester acid cellulose in a mixed solvent under stirring at room temperature to make a solution with a mass percentage of 6%, adding glycerin to make a casting solution , the mass ratio of glycerol to cellulose diester is 3:1, the casting solution is left to stand for 30 minutes, and the casting solution is coated on the polyester nuclear pore membrane with a thickness of 500 μm on a constant temperature and humidity coating machine, The length of the coating machine is 60 meters. Under the conditions of 50 ° C and a relative humidity of 90%, the coating speed is 1.0 m / min and the treatment is 60 minutes. It is placed in deionized water in a constant temperature water bath, soaked at room temperature for 2 hours, and dried to obtain A composite nuclear pore membrane with a thickness of 160 μm, the mixed solvent is acetone and dimethylformamide with a volume ratio of 0.7:1; the p...

Embodiment 3

[0030] A preparation method of a composite nuclear pore membrane, comprising the following steps: dissolving diester acid cellulose in a mixed solvent under stirring at room temperature to make a solution with a mass percentage of 7%, adding glycerin to make a casting solution , the mass ratio of glycerol to cellulose diester is 3.3:1, the casting solution is left to stand for 2 hours, and the casting solution is coated on the polycarbonate nuclear pore membrane with a thickness of 200 μm on a constant temperature and humidity coating machine , the length of the coating machine is 60 meters, under the conditions of 70 ℃ and relative humidity of 95%, the coating speed is 2.0 m / min, and the treatment is 30 minutes. Place it in the deionized water of the constant temperature water bath machine, soak it at room temperature for 2 hours, and dry it. Obtaining a composite nuclear pore membrane with a thickness of 85 μm, the mixed solvent is acetone and dimethylformamide with a volume ...

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Abstract

The invention discloses a composite nuclear track membrane and a preparation method thereof. The composite nuclear track membrane comprises a polyester nuclear track membrane or a polycarbonate nuclear track membrane, wherein a porous cellulose acetate membrane is composited on one surface of the polyester nuclear track membrane or the polycarbonate nuclear track membrane so as to form the composite nuclear track membrane of which the thickness is 67-160 microns, the aperture of the polyester nuclear track membrane or the polycarbonate nuclear track membrane is 1-10 microns, the pore density of the polyester nuclear track membrane or the polycarbonate nuclear track membrane is 2*10<5>/cm<2>-2*10<7>/cm<2>, and the thickness of the polyester nuclear track membrane or the polycarbonate nuclear track membrane is 7-25 microns. The composite nuclear track membrane has the advantage that the surface hydrophilicity is good, the mechanical strength is high, the membrane thickness is moderate, the automatic operation can be realized easily, the flux of the filtering liquid is high, and the assimilative capacity is strong; the composite membrane is an integer, is not layered and is suitable for fabricating roll type filter cores; the porous cellulose acetate membrane composited on the nuclear track membrane is taken as a pre-filtering layer or a support layer of the nuclear track membrane, so that the problems about mechanical strength and thickness of the membrane are solved, and meanwhile, the a pre-filtering problem of the membrane is solved.

Description

technical field [0001] The invention belongs to the technical field of liquid filtration, and in particular relates to a composite nuclear pore membrane and a preparation method thereof. Background technique [0002] Nuclear pore membrane, also known as track etching membrane, is a microporous film invented in the early 1970s. It uses heavy ions accelerated by an accelerator or thermal neutrons in a nuclear reactor to fission uranium-235, and the fragments produced by the fission are injected into the collimator and penetrate the organic polymer plastic film. Leaving a narrow irradiation channel—the track—on the path of the particle. Etching with appropriate chemical reagents can etch the tracks on the film into cylindrical or biconical micropores. Nuclear pore membranes with different pore densities and pore diameters can be obtained by controlling the irradiation conditions and etching conditions respectively. [0003] The nuclear pore membrane has uniform pore size, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D71/48B01D71/50B01D71/16B01D67/00
Inventor 阎尔坤杨铭郭峻岭
Owner 天津理源科技有限公司
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