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Preparation and its products for composite nanometer filter membrane

A technology of composite nanofiltration membrane and ultrafiltration membrane, which is applied in the field of membrane separation, can solve problems such as shortening the crosslinking time, achieve the effect of sensitive temperature response, uniform crosslinking degree, and realize continuous industrial production

Inactive Publication Date: 2006-03-15
TIANJIN MOTIAN MEMBRANE ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the technical problem to be solved in the present invention is to design a preparation method of a composite nanofiltration membrane and its products. The preparation method can effectively shorten the crosslinking time, improve the production speed, and be easy to continuous industrial production. And no environmental pollution; the composite nanofiltration membrane product is easy to manufacture, positively charged, and has a keen temperature response

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Use N,N-dimethylaminoethyl methacrylate (DMAEMA) to remove the polymerization inhibitor by vacuum distillation, condition: 54°C, 1.04MPa; put the freshly steamed DMAEMA into a soft plastic container, add A certain amount of AIBN, usually N 2After 10 minutes, it was sealed and placed in a 50°C constant temperature water bath to polymerize for 7 days to obtain polymethacrylic acid-N,N-dimethylaminoethyl ester (PDMAEMA); using ultrafiltration technology (the ultrafiltration membrane used was polysulfone with a MWCO of 10,000 hollow fiber ultrafiltration membrane) to filter the PDMAEMA aqueous solution, and filter oligomers therein; the refined 1wt% PDMAEMA aqueous solution is coated on the surface of the PSF hollow fiber ultrafiltration membrane, and the dipping time is 1min, and it is dried in the shade at room temperature; the dried in the shade The film was placed in a β-ray field at 2×10 4 Under the irradiation dose of Gy, irradiate for 3 minutes to obtain a composite...

Embodiment 2

[0024] With methacrylic acid-N, N-dimethylaminomethyl ester adopts the same step as embodiment 1 to obtain polymethacrylic acid-N, N-dimethylaminomethyl ester; Adopt ultrafiltration technology (used ultrafiltration membrane is MWCO is 10,000 polysulfone hollow fiber ultrafiltration membrane) to filter its aqueous solution to remove oligomers therein; the refined 0.5wt% polymethacrylic acid-N,N-dimethylaminomethyl aqueous solution is coated on a PSF flat plate ultrafiltration On the surface of the filter membrane, the dipping time is 30min, and the hot air is dried at 50°C for 1min; the dried membrane is placed in a β-ray radiation field, and the 4 Under the irradiation dose of Gy, irradiate for 5 minutes to obtain a composite nanofiltration membrane with a smooth surface. Tests show that the prepared nanofiltration membrane has a rejection rate of 46% for 0.5g / LNaCl and 1g / LMgSO 4 The rejection rate is 80%. The water flux is 25L / (m 2 h).

Embodiment 3

[0026] The methacrylic acid-N,N-dimethylamino ester is removed by vacuum distillation, the condition: 50°C, 1.1MPa; put the freshly steamed methacrylic acid-N,N-dimethylamino ester into In a soft plastic container, add a certain amount of AIBN, usually N 2 After 10 minutes, it was sealed and placed in a 55°C constant temperature water bath to polymerize for 3 days to obtain polymethacrylic acid-N,N-dimethylamino ester; using ultrafiltration technology (the ultrafiltration membrane used was polysulfone hollow fiber ultrafiltration with MWCO of 10,000 membrane) to filter its aqueous solution to remove oligomers therein; the refined 1.5wt% polymethacrylic acid-N, N-dimethylamino ester aqueous solution is coated on the surface of the PVDF hollow fiber ultrafiltration membrane, and the dipping time is 60min , dried with hot air at 30°C for 5min; the dried film was placed in a β-ray radiation field at 10×10 4 Under the irradiation dose of Gy, irradiate for 10 minutes to obtain a co...

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Abstract

A process for preparing the composite nano-class filtering membrane includes such steps as providing the ultra-filter membrane made of polysulfone or poly vinylidene fluoride as substrate, dipping in the aqueous solution of aminoester polyacrylate polymers chosen from polymethyl acrylate-N, N-dimethylamino ethylester, polymethyl acrylate-N, N-dimethylamino methylester, polymethyl acrylate-N, N-diethylamino methylester, etc, drying, and beta-ray irradiating for cross-linking.

Description

technical field [0001] The invention relates to a membrane separation technology, specifically a polysulfone flat ultrafiltration membrane or a hollow fiber ultrafiltration membrane as a base membrane, and a cross-linked polyacrylic acid amino ester polymer such as polymethacrylic acid N, N-dimethylamino The preparation method of composite nanofiltration membrane with ethyl ester (PDMAEMA) as the functional layer material, the main international patent classification number is proposed to be Int.Cl 7 .BOID 71 / 00. Background technique [0002] Membrane separation technology is a new separation technology, which has developed rapidly in recent decades and has been widely used in many fields, and its application fields are constantly expanding. Nanofiltration membrane is a new pressure-driven separation membrane between reverse osmosis and ultrafiltration. In application, nanofiltration membrane has two notable features: first, its molecular weight cut-off (MWCO) is between r...

Claims

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Application Information

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IPC IPC(8): B01D69/12
Inventor 王薇郝建刚肖长发杜启云张宇峰任连娟
Owner TIANJIN MOTIAN MEMBRANE ENG & TECH
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