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Crosslinked hyperbranched polyalcohol composite nano filter membrance and method of preparing the same

A hyperbranched polymer and composite nanofiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve problems such as difficult separation and purification, difficulty in large-scale production, and complex synthesis of PAMAM molecules. Achieve high retention rate and simple and easy-to-obtain materials

Inactive Publication Date: 2008-09-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of PAMAM molecules is complicated, separation and purification are difficult, and it is difficult to achieve large-scale production
At present, domestic research on the functional application of hyperbranched polymers is mainly focused on: preparation of catalysts, preparation of nano-metal particles, gas separation membranes, self-assembled membranes, etc., and the use of hyperbranched polymers to prepare nanofiltration composite membranes has not yet been found. to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Soak the purchased polysulfone ultrafiltration base membrane in a mixed solution of ethanol and water with a volume ratio of 3:2 for 20 minutes; then immerse the polysulfone ultrafiltration membrane in a 4.6×10 -3 mol / l aqueous phase solution, take it out after 40min, and dry it naturally; then soak the film in 5.8×10 trimesoyl chloride -3 mol / l n-hexane solution, take it out after 20 minutes; then place the membrane in an oven at 60°C for 20 minutes to obtain a hyperbranched polyester composite nanofiltration membrane. With a concentration of 1g / l Na under the pressure of 0.3Mpa 2 SO 4 Tested, the water flux of the membrane is 79.1l / m 2 h,Na 2 SO 4 The removal rate is 80.4%. With a concentration of 1g / l Na under the pressure of 0.6Mpa 2 SO 4 Tested, the water flux of the membrane is 115.4l / m 2 h,Na 2 SO 4 The removal rate is 85.6%.

Embodiment 2

[0042] Soak the purchased polysulfone ultrafiltration base membrane in a mixed solution of ethanol and water with a volume ratio of 3:2 for 10 minutes; then immerse the polysulfone ultrafiltration membrane in a 4.6×10 -3 mol / l aqueous phase solution, take it out after 50min, and dry it naturally; then soak the film in 8.3×10 trimesoyl chloride -3 mol / l n-hexane solution, take it out after 10 minutes; then place the membrane in an oven at 90°C for 10 minutes to obtain a hyperbranched polyester composite nanofiltration membrane. With a concentration of 1g / l Na under the pressure of 0.3Mpa 2 SO 4 Tested, the water flux of the membrane is 38.9l / m 2 h,Na 2 SO 4 The removal rate is 86.4%. With a concentration of 1g / l Na under the pressure of 0.6Mpa 2 SO 4 Tested, the water flux of the membrane is 56.1l / m 2 h,Na 2 SO 4 The removal rate is 90.2%.

Embodiment 3

[0044] Soak the purchased polysulfone ultrafiltration base membrane in a mixed solution of ethanol and water with a volume ratio of 3:2 for 50 minutes; then immerse the polysulfone ultrafiltration membrane in a 4.6×10 -3 mol / l aqueous phase solution, take it out after 20min, and dry it naturally; then soak the film in 6.7×10 trimesoyl chloride -3 mol / l n-hexane solution, take it out after 30s; then place the membrane in an oven at 40°C for 50min to obtain a hyperbranched polyester composite nanofiltration membrane. With a concentration of 1g / l Na under the pressure of 0.3Mpa 2 SO 4 Tested, the water flux of the membrane is 57.5l / m 2 h,Na 2 SO 4 The removal rate is 85.3%. With a concentration of 1g / l Na under the pressure of 0.6Mpa 2 SO 4 Tested, the water flux of the membrane is 96.5l / m 2 h,Na 2 SO 4 The removal rate is 89.8%.

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Abstract

The invention discloses a crosslinking hyper branched polymer composite nanofiltration membrane as well as the preparation method thereof. The crosslinking hyper branched polymer composite nanofiltration membrane is prepared by taking an ultrafiltration membrane as a basement membrane and crosslinking hyper branched polymer as a selecting layer through hyper branched polymer and the interfacial polymerization of polybasic acid, polybasic acyl chloride, polybasic anhydride and polybasic amine; and the interfacial polymerization takes the mixed solution of water and ethanol as the water phase and n-hexane, n-heptane or n-octane as the organic phase. As the hyper branched polymer has the spheroidal structure, a plurality of nano-voids exist in the interior of the molecule, so as to enable the selecting layer of the crosslinking hyper branched polymer composite nanofiltration membrane to be looser, and leads the nanofiltration membrane to maintain high flux and retention rate under the lower operating pressure. The nanofiltration membrane can be used in the fields of medicament, foodstuff, environmental protection, etc. The composite nanofiltration membrane is applicable to the separation and the condensation of high valence ions, low valence ions, neutral particles, drugs, food additives, etc.

Description

technical field [0001] The invention relates to a nanofiltration membrane material and its preparation technology, and specifically provides a cross-linked hyperbranched polymer composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane (NF) is a new type of separation membrane developed at home and abroad in recent years. Its separation characteristics are between reverse osmosis and ultrafiltration. processing has been widely used. Foreign membranes and membrane components have been commercialized in the 1980s and have entered the stage of industrial application. my country's nanofiltration membrane research began in the early 1990s. The Water Treatment Center of the State Oceanic Administration, Tsinghua University, Fudan University, Dalian University of Technology, Beijing University of Chemical Technology and other units have carried out a lot of research work and achieved good results, but most of them are...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/00
Inventor 徐又一魏秀珍朱宝库邓慧宇
Owner ZHEJIANG UNIV
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