Novel charged polyamide composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems affecting membrane structure and performance, loss of inorganic nanomaterials, weak interaction force, etc. Inhibits agglomeration behavior, promotes dispersibility, increases the effect of interactions

Active Publication Date: 2014-08-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the polyamide composite nanofiltration membrane containing inorganic nanomaterials prepared by interfacial polymerization also faces several major problems: inorganic nanomaterials are easy to agglomerate due to their high surface energy and large specific surface area, and it is difficult to uniformly disperse in the interfacial polymerization. In the water phase or oil phase solution, defects are easily formed in the polyamide membrane, which seriously affects the structure and performance of the membrane; due to the inherent difference between polyamide and inorganic nanomaterials, the compatibility between the organic-inorganic two phases is poor, The interaction force is weak, which easily leads to the loss of inorganic nanomaterials during the membrane service process, which not only damages the performance of the membrane but also causes secondary pollution. These problems become the further development and application of polyamide nanofiltration membranes containing inorganic nanomaterials in the separation layer. main obstacle

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  • Novel charged polyamide composite nanofiltration membrane and preparation method thereof

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Effect test

Embodiment 1

[0023] By reversible addition-fragmentation chain transfer (RAFT) polymerization, polymethacrylic acid was grafted on silica nanoparticles with a diameter of 30 nm to obtain polymethacrylic acid-modified silica nanoparticles, polymethacrylic acid The number-average molecular weight is 6,000 g / mol; 0.1 g of polymethacrylic acid-modified silica nanoparticles and 0.5 g of ethylenediamine are dispersed in 99.4 g of water to prepare 100 g of polymethacrylic acid-modified silica The aqueous phase ethylenediamine solution of nanoparticles, and adjust the pH value of the aqueous phase ethylenediamine solution to 7; immerse the polyethersulfone ultrafiltration membrane in the aqueous phase ethylenediamine solution after adjusting the pH value, and take out the membrane after 15 minutes , wipe off the excess water phase solution on the surface of the membrane; then immerse in n-hexane solution containing 10% trimesoyl chloride by mass percentage, take it out after 0.5 minutes, rinse with...

Embodiment 2

[0025] By reversible addition-fragmentation chain transfer (RAFT) polymerization, polyacrylic acid was grafted on silica nanoparticles with a diameter of 180 nm to obtain polyacrylic acid-modified silica nanoparticles, and the number average molecular weight of polyacrylic acid was 400,000 g / mole; 10g polyacrylic acid-modified silica nanoparticles and 10g m-phenylenediamine are dispersed in 80g water to prepare 100g aqueous phase m-phenylenediamine solution containing polyacrylic acid-modified silica nanoparticles, and adjust the water phase The pH value of the phenylenediamine solution is up to 12; the polysulfone ultrafiltration membrane is immersed in the aqueous phase m-phenylenediamine solution after adjusting the pH value, and the membrane is taken out after 0.5 minutes, and the excess water organic phase solution on the surface of the membrane is wiped; The modified pair containing cyclohexane with a mass percentage of 0.5% isophthaloyl chloride, I neglected to put it i...

Embodiment 3

[0027] Polystyrene sulfonic acid-modified silica nanoparticles were obtained by grafting polystyrene sulfonic acid on silica nanoparticles with a diameter of 90 nm by atom transfer radical polymerization (ATRP). The number-average molecular weight is 30,000 g / mol; 5 g of polystyrene sulfonic acid-modified silica nanoparticles and 2 g of p-phenylenediamine are dispersed in 93 g of water to prepare 100 g of polystyrene sulfonic acid-modified silica nanoparticles The water relative phenylenediamine solution, and adjust the pH value of the water relative phenylenediamine solution to 9; immerse the polyacrylonitrile ultrafiltration membrane in the water relative phenylenediamine solution after adjusting the pH value for 5 minutes, take out the membrane, wipe Remove the excess water phase solution on the surface of the membrane; then immerse in a cyclohexane solution containing 4% terephthaloyl chloride by mass percentage, take it out after 5 minutes, rinse with deionized water 5 tim...

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Abstract

The invention discloses a novel charged polyamide composite nanofiltration membrane and a preparation method thereof. The method comprises the following steps: grafting charged polymer onto the surface of the silicon dioxide nanoparticles by active/controllable free-radical polymerization to obtain charged-polymer-modified silicon dioxide nanoparticles; dispersing the charged-polymer-modified silicon dioxide nanoparticles and amine monomer in water to prepare a water-phase amine monomer solution; dissolving acyl chloride monomer in an organic solvent to prepare an oil-phase acyl chloride monomer solution; and immersing the polymer ultrafiltration membrane into the water-phase amine monomer solution, and immersing into the oil-phase acyl chloride monomer solution to obtain the novel polyamide composite nanofiltration membrane of which the separating layer contains the charged-polymer-modified silicon dioxide nanoparticles. The method is simple and easy to implement, has the advantages of low production cost and obvious, stable and permanent modification effect, and has favorable industrialization application prospects.

Description

technical field [0001] The invention belongs to the technical field of filtration membrane separation, and relates to a novel charged polyamide composite nanofiltration membrane and a preparation method thereof, in particular to a novel polyamide composite nanofiltration membrane containing silica nanoparticles modified by charged polymers in the separation layer Membranes and methods for their preparation. Background technique [0002] Membrane separation technology is a new type of high-efficiency separation technology that is rapidly emerging, and has become one of the common technologies to solve major problems in the fields of water resources, energy, and the environment. Nanofiltration is one of the industrialized membrane separation technologies. It is a pressure-driven membrane separation technology developed after the 1980s between reverse osmosis and ultrafiltration. During the separation process, there is no phase change, no Chemical reaction, no destruction of b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00B01D69/12
Inventor 薛立新朱丽静刘富
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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