Charged microporous filtration membrane and affinity base membrane preparing method

A technology of microporous membrane filtration and charging, which is applied in the field of microporous membranes, can solve problems such as limitations, and achieve the effects of simple reaction, improved filtration efficiency, good hydrophilicity and biocompatibility

Inactive Publication Date: 2005-02-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They can effectively remove contaminants from fluids through an electrostatic adsorption mechanism; however, since hydrophobic polymers are often not compatible with modifying polymers, this limits the degree of charge modification and limits membranes in other ( Such as affinity separation) application; the use of hydrophobic substrate, strong non-specific adsorption

Method used

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  • Charged microporous filtration membrane and affinity base membrane preparing method
  • Charged microporous filtration membrane and affinity base membrane preparing method
  • Charged microporous filtration membrane and affinity base membrane preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Use 7% by weight of cellulose diacetate, 43.8% of dimethylformamide, 22.7% of acetone, and 26.5% of glycerin to prepare a film-making solution, and apply the film solution on a glass plate with a thickness of 500 μm. Moisture absorption and precipitation in air with a humidity higher than 95% for 8 minutes. After the phase separation is basically completed, immerse in water to complete the solvent exchange and remove unnecessary components, solidify the membrane structure, and prepare a flat microfiltration membrane.

Embodiment 2

[0019] Add 50% PEI aqueous solution, polyethylene glycol (molecular weight 1000), and ethylenediamine to the dimethylformamide / acetone solution of cellulose diacetate to prepare a polymer solution, and polyisocyanate (diphenylmethyl diisocyanate) Polymer) 7% solution (DMF and acetone are half and half as solvent), added according to the weight ratio of polyisocyanate, polyethylene glycol, and ethylenediamine as 10:4:1, and added glycerin after polymerization and crosslinking to prepare Membrane fluid, its final weight percentage is cellulose diacetate 6.9%, dimethylformamide 43.2%, acetone 22.5%, 50% PEI aqueous solution 1%, has added 0.12% polyethylene glycol (molecular weight 1000), 0.03% ethyl alcohol Diamine, 0.34% polyisocyanate, 23.8% glycerin, scrape the film solution on a glass plate with a thickness of 500 μm, and deposit it in air at 50°C with a relative humidity higher than 95% for 2 minutes. All the other conditions are with embodiment 1.

Embodiment 3

[0021] Add 50% PEI aqueous solution to the dimethylformamide / acetone solution of cellulose diacetate to prepare a blended polymer solution. The final weight percentage is 7% of cellulose diacetate, 45.7% of dimethylformamide, and 23.7% of acetone %, 50% PEI aqueous solution 0.5%, glycerin 23.1%, scrape the film solution on a glass plate with a thickness of 400 μm, and deposit it in air at 50°C with a relative humidity higher than 95% for 2 minutes. All the other conditions are with embodiment 1.

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Abstract

The invention relates to a microporous membrane, concretely speaking, an approach of producing charge microporous membrane and its affinity basement membrane. By weight, use cellulose acetate of 5-9 percent as basic material. Mix polycation compound of 0-15 percent in acetone / dimethyl formamide of 45-70 percent. Use polyisocyanate of 0-0.8 percent as crosslinking agent to react. Add glycerin as additive. After knifing, absorb moisture in temperature of 30-70deg.C and relative humidity of over 95 percent and volatilize impregnant misphasing gel for 1-30 minutes. Finally form membrane and solidify. Merits of the invention lie in wide applied range, stable performance and normal reaction condition.

Description

technical field [0001] The invention relates to a microporous membrane, in particular to a preparation method of a CA / PEI blended charged microporous filter membrane and an affinity base membrane. Background technique [0002] Microporous membranes are generally defined as a thin-walled, open sponge pore morphology with a narrow pore size distribution. Microporous membranes have a large porosity with a pore size ranging from 0.01-10 microns, and their traditional application is the removal of fine contaminants from liquid or gaseous media. Particles such as dust or bacteria can be removed by a sieving mechanism with a microporous membrane filter. The filtration efficiency of the sieving mechanism is controlled by the relative size of the particle and membrane pore size. In order to achieve absolute particle retention, a membrane with a smaller pore size is required to meet the higher requirements in the medical and electronic industries. However, the small pore size brings...

Claims

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Application Information

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IPC IPC(8): B01D69/06B01D71/16B01D71/82
Inventor 陈兆安邓麦村陈勇李京华李晖张桂花
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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