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Cellulose acetate commixed nano-filtration membrane and preparation method thereof

A cellulose acetate, nanofiltration membrane technology, applied in chemical instruments and methods, membranes, membrane technology and other directions, can solve problems such as poor compatibility and affect membrane performance, and achieve good flexibility and flatness, pH and Improved biocompatibility, good defense effect

Inactive Publication Date: 2016-03-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned blended membranes have all improved the acid resistance, alkali and water permeability of cellulose acetate nanofiltration membranes, but they are all achieved by adding polymer phases, such as cyanoethyl cellulose, polyethersulfone, polyacrylonitrile, Polyvinylidene fluoride, polymethyl methacrylate, two different polymers are mixed, the compatibility is poor, and it will affect the film performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Preparation of casting solution: Dissolve 2g of lithium chloride in 86g of dimethylacetamide at 70°C with stirring, then dissolve 32g of vinyl chloride-vinyl acetate copolymer (14% vinyl acetate content) in chlorine Lithium chloride / dimethylacetamide, finally weigh 80g of cellulose diacetate and dissolve it in the mixed solution of vinyl chloride-vinyl acetate copolymer / lithium chloride / dimethylacetamide for 4h, filter and stand for defoaming to obtain Cellulose acetate film casting liquid stand-by;

[0038] 2) Film making: use a glass rod to scrape the casting solution prepared in step 1) on a glass plate with a layer of polyester non-woven fabric on the surface, and place the nascent film at a temperature of 30°C and a relative humidity of Volatilize for 40s under 95% air;

[0039] 3) Coagulation bath treatment: the flat nascent membrane prepared in step 2) is phase-separated and solidified in 40% dimethylacetamide aqueous solution at 40°C to form a membrane mater...

Embodiment 2

[0044] 1) Preparation of casting solution: Dissolve 100g of polyethylene glycol 400 in 570g of acetone at 80°C with stirring, then dissolve 30g of polyvinyl butyral in polyethylene glycol 400 / acetone, and finally weigh 300g of cellulose triacetate was dissolved in a mixed solution of polyvinyl butyral / polyethylene glycol 400 / acetone for 5h, filtered, left standing for defoaming to obtain the cellulose acetate casting solution for use;

[0045]2) Membrane production: extrude the cellulose acetate casting solution prepared in step 1) and the medium (nitrogen gas, flow rate 20mL / min) that forms the inner cavity of the fiber through a spinneret to obtain a nascent hollow fiber membrane, and The nascent film was placed in the air with a temperature of 10°C and a relative humidity of 50% for 10 seconds;

[0046] 3) Coagulation bath treatment: the hollow fiber nascent membrane prepared in step 2) is phase-separated and solidified in deionized water at 60°C to form a membrane material...

Embodiment 3

[0051] 1) Preparation of casting solution: Dissolve 40g of ethanol in 830g of dimethyl sulfoxide at 50°C under stirring conditions, and then add 30g of vinyl chloride-vinyl acetate-maleic anhydride terpolymer (the content of vinyl acetate is 13% , maleic anhydride content is 1%) dissolved in ethanol / dimethyl sulfoxide, and finally weigh 100g of cellulose diacetate in vinyl chloride-vinyl acetate-maleic anhydride terpolymer / ethanol / dimethyl sulfoxide Dissolve in the mixed solution of 2h, filter, let stand for defoaming to obtain the cellulose acetate casting solution for use;

[0052] 2) Membrane production: Extrude the cellulose acetate casting solution prepared in step 1) and the medium (50% ethanol water solution) that forms the inner cavity of the fiber through a spinneret to obtain a hollow fiber nascent eco-membrane, and the nascent eco-membrane The film is volatilized in air at a temperature of 20°C and a relative humidity of 20% for 120s;

[0053] 3) Coagulation bath t...

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Abstract

The invention discloses a cellulose acetate commixed nano-filtration membrane and a preparation method thereof. The cellulose acetate commixed nano-filtration membrane is prepared by taking cellulose acetate as a base material phase and a macromolecular hydrophilic substance as a dispersed phase, adding a micro-molecular pore-forming agent, dissolving with a solvent to prepare a cellulose acetate membrane casting solution, coating the prepared membrane casting solution on a dry and clean glass plate with a supporting layer to form a flat-plate nascent-state membrane or extruding the prepared membrane casting solution and media for forming inner cavities of fibers through a spinneret plate to form a hollow fiber nascent-state membrane, and condensing and carrying out heat treatment on the hollow fiber nascent-state membrane. The macromolecular hydrophilic substance has good acid resistance, alkali resistance and biocompatibility and is added into a cellulose acetate membrane casting solution system to prepare the membrane, so that the water penetration amount and porosity of the membrane can be improved, and the flexibility, flatness and chemical reagent resisting stability of the membrane also can be improved; and compared with a single cellulose acetate nano-filtration membrane, the commixed nano-filtration membrane has relatively wide feasibility and relatively strong practicability.

Description

technical field [0001] The invention relates to the field of polymer membrane materials, in particular to a cellulose acetate blended nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane is a new type of separation membrane with a pore size between reverse osmosis membrane and ultrafiltration membrane. It has unique separation performance and higher separation precision. Compared with other separation membranes, nanofiltration membranes have the characteristics of large membrane flux, low process osmotic pressure, selective separation of ions, low operating pressure, and low power requirements of the system. At present, nanofiltration membrane technology has been widely used in water softening and brackish water desalination, drinking water purification, material separation and purification and concentration, wastewater treatment and reclaimed water reuse, clean production and other fields, and has achieved good eco...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D67/00B01D61/00
CPCB01D71/16B01D61/027B01D67/0002B01D2325/30B01D2325/36
Inventor 刘必前李兰汪前东
Owner INST OF CHEM CHINESE ACAD OF SCI
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