Preparation method of nanometer TiO2-PA laminated film

A composite thin film and nanotechnology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of easy falling off of particles, reduction of TiO2 concentration, etc., achieve low operating cost, solve the problem of TiO2 concentration reduction, The effect of increasing the filtration flux

Inactive Publication Date: 2013-09-18
苏州瀚海高分子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-TiO prepared by this method 2 -PA composite film has a stable structure, which solves the problem of TiO in traditional preparation methods 2 Particles are easy to fall off and cause the TiO film to 2 The problem of reduced concentration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Nano TiO 2 -Preparation of PA composite film

[0037] (1) Preparation of polyethersulfone carrier.

[0038] Under the constant temperature of 25℃ and good stirring conditions, dissolve polyethersulfone in N,N-dimethylformamide to form a solution, the mass fraction of polyethersulfone is 17%, and then on the non-woven fabric under water bath conditions Carry out precipitation. The thickness of the carrier layer is controlled at 160 μm, and finally the solvent is removed by washing with distilled water to obtain a porous carrier.

[0039] (2) Nano TiO 2 -Preparation of PA composite film.

[0040] Firstly, the polyethersulfone carrier is soaked in an aqueous solution containing sodium hydroxide and m-phenylenediamine (m-MPD) for 2 minutes to coat the surface. The mass fraction of m-phenylenediamine is 2%; the mass fraction of sodium hydroxide Is 0.04%.

[0041] Nano TiO 2 The particles are added to the mixed solution of 1,1-dichloro-1-fluoroethane (HCFC) and 1,3,5-trica...

Embodiment 2

[0043] Example 2 Nano TiO 2 -Preparation of PA composite film

[0044] (1) Preparation of polyethersulfone carrier.

[0045] Under the constant temperature of 25℃ and good stirring conditions, dissolve polyethersulfone in N,N-dimethylformamide to form a solution, the mass fraction of polyethersulfone is 17%, and then on the non-woven fabric under water bath conditions Carry out precipitation. The thickness of the carrier layer is controlled at 160 μm, and finally the solvent is removed by washing with distilled water to obtain a porous carrier.

[0046] (2) Nano TiO 2 -Preparation of PA composite film.

[0047] First, the polyethersulfone carrier is soaked in an aqueous solution containing sodium hydroxide and m-phenylenediamine (m-MPD) for 2 minutes for surface coating. The mass fraction of m-phenylenediamine is 3%; the mass fraction of sodium hydroxide Is 0.05%.

[0048] Nano TiO 2 The particles are added to the mixed solution of 1,1-dichloro-1-fluoroethane (HCFC) and 1,3,5-tricarb...

Embodiment 3

[0050] Example 3 Nano TiO 2 -Preparation of PA composite film

[0051] (1) Preparation of polyethersulfone carrier.

[0052] Under the constant temperature of 25℃ and good stirring conditions, dissolve polyethersulfone in N,N-dimethylformamide to form a solution, the mass fraction of polyethersulfone is 17%, and then on the non-woven fabric under water bath conditions Carry out precipitation. The thickness of the carrier layer is controlled at 180 μm, and finally the solvent is removed by washing with distilled water to obtain a porous carrier.

[0053] (2) Nano TiO 2 -Preparation of PA composite film.

[0054] Firstly, the polyethersulfone carrier is immersed in an aqueous solution containing sodium hydroxide and m-phenylenediamine (m-MPD) for 1 min, and the surface is coated. The mass fraction of m-phenylenediamine is 2%; the mass fraction of sodium hydroxide Is 0.04%.

[0055] Nano TiO 2 The particles are added to the mixed solution of 1,1-dichloro-1-fluoroethane (HCFC) and 1,3,5-...

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Abstract

The invention discloses a preparation method of a nanometer TiO2-PA laminated film. According to the method, nanometer TiO2 particles are effectively scattered in the film through interfacial polymerization, so that the filtration flux of a PA film is effectively improved; moreover, the nanometer TiO2 particles can be effectively adhered to the PA film for a long time, so that the problem that the TiO2 particles easily drop off to cause the situation the TiO2 concentration of the film during the using process is reduced in the traditional preparation method is solved, and the stability of the nanometer TiO2-PA laminated film is ensured; and therefore, the preparation method has good application prospect and important research significance.

Description

Technical field [0001] The invention belongs to the field of polymer material synthesis, and in particular relates to a nano TiO 2 -The preparation method of PA composite film. Background technique [0002] Nanofiltration (NF, referred to as nanofiltration) is a new type of membrane separation process between reverse osmosis and ultrafiltration that uses pressure as the driving force. The pore size range of nanofiltration membranes (referred to as nanofiltration membranes) is several Around nanometers. It can intercept small organic molecules and allow most of the inorganic salts to pass through. The operating pressure is low. It has good application prospects in food industry, biochemical industry and water treatment. The cut-off relative molecular mass of the nanofiltration membrane is less than 1000 and greater than 100, which fills the gap between the ultrafiltration membrane and the reverse osmosis membrane. Nanofiltration membranes can trap solutes that can pass through u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/56B01D71/68B01D67/00
Inventor 宁珅徐勇黄志远
Owner 苏州瀚海高分子有限公司
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