Method for preparing compound nanometer filtering membrane of chitosan sulfate-high molecule polymer

A high-molecular polymer and chitosan sulfate technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems that affect the efficiency and life of the membrane, so as to prolong the service life and improve the acceptability of the membrane. Membrane efficiency, the effect of improving the efficiency of use

Inactive Publication Date: 2005-06-29
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microorganisms such as algae and bacteria are easy to adhere to the surface of these polymer compound membranes, which affects the efficiency and life of the membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Take an ultrafiltration membrane of polyacrylonitrile with a relative molecular weight cut-off of 6000-10000, wash the surface of the membrane with deionized water, fix it on a smooth and clean glass plate with a 1 cm wide scotch tape, and evaporate it to near dryness at room temperature. Then get chitosan sulfate and be dissolved in deionized water and be made into the solution of 2.0%~4.0% (concentration by weight, the same below), filter with No. 4 glass sand core funnel, get filtrate and pour on the surface of above-mentioned basement film carefully, Use a smooth glass rod to level the solution, make it evenly dipped on the surface of the base film, let the excess solution overflow, dry it and treat it at 50-60°C for 0.5-2 hours, and then carefully pour 0.5%-2% on the film The glutaraldehyde aqueous solution, the solution on the surface is also flattened with a glass rod, and the excess solution is allowed to overflow, and then the membrane plate is thermally cross-l...

Embodiment 2

[0010] The polyacrylonitrile ultrafiltration membrane in Example 1 is replaced by polysulfone, polyethersulfone, polypropylene, polyethylene, polyvinylidene fluoride, cellulose acetate, polyurethane, polyvinyl chloride with a relative molecular weight cut-off of 6000 to 10000 The ultrafiltration membrane of dilute, polycaprolactam or polyfuran alcohol, conditions such as operating pressure are identical with embodiment 1, record corresponding macromolecular polymer-chitosan sulfate ester composite nanofiltration membrane to have and embodiment 1 polyacrylonitrile shell Polysaccharide sulfate composite nanofiltration membrane has similar nanofiltration efficacy.

Embodiment 3

[0012] On the base film described in embodiment 1 and embodiment 2, the aqueous solution of the chitosan sulfate ester that evenly dips and coats one deck and contains the chitosan sulfate ester of 2.0%~4.0% and the aqueous solution of 5.0%~10%NaOH , level the solution with a smooth glass rod, make it evenly dip-coated on the surface of the base film, let the excess solution overflow, dry it and treat it at 50-60°C for 0.5-2h, and then dip-coat a layer of 0.5-1.0% epoxy Chloropropane ethanol solution, treated at 50-65°C for 2-4 hours, washed with deionized water, has similar nanofiltration effect.

[0013] When the epichlorohydrin ethanol solution in this embodiment is replaced with a tetracyanofuran solution of an oil-soluble cross-linking agent such as diisocyanate and glyceryl glycidyl ether, the concentration of the cross-linking agent, operating conditions and steps remain unchanged, and the preparation The obtained membrane has similar nanofiltration performance.

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Abstract

A way to produce sulfuric acid ester--high numerator film, whose feature is using high numerator film polymer as the basic film such as polypropylene, juyixi, and so on, on the film smear over a layer of the solution of sulfuric acid ester, operate for 1.5--2h at the temperature of 50-60 degC, then smear over a layer of ether solution. Do it for 2--4h at 50-65 degC, wash it using water ion. The invention of the film's surface has some free ammonia, so it has the effect of killing germs, hard to adhere microorganism, increase the efficiency of the film's using, and prolong the survive life, at the same time, it has the good efficiency of filtering.

Description

Technical field: [0001] The invention relates to a preparation method of a nanofiltration membrane used for water treatment, in particular to a preparation method of a chitosan sulfate-high molecular polymer composite nanofiltration membrane. Background technique: [0002] Nanofiltration membrane is a membrane with a membrane pore size between reverse osmosis and ultrafiltration membranes. + and Cl - The rejection rate of other monovalent ions is low, but the Ca 2+ , SO 4 2- , Mg 2+ The rejection rate of high-valent ions and organic substances with small molecular weight (200-1000) is very high, and the operating pressure is low. Since the mid-1970s, some nanofiltration membranes have been developed, such as diacetate-triacetate fiber asymmetric nanofiltration membranes, aromatic polyamide composite nanofiltration membranes, and sulfonated polyethersulfone coating composite nanofiltration membranes. Microorganisms such as algae and bacteria are easy to adhere to the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/08
Inventor 陈国华苗晶高从堦
Owner OCEAN UNIV OF CHINA
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