Composite film and preparation method and application thereof

A composite membrane and porous membrane technology, applied in the field of composite membranes, can solve the problems of poor biofouling resistance of composite membranes

Inactive Publication Date: 2020-10-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem of poor biofouling resistance of existing water treatment composite membranes, the present invention provides a composite membrane with excellent interception performance, good water permeability and excellent biofouling resistance, its preparation method and the composite membrane used in water treatment application in process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Contact the upper surface of the polysulfone support layer with an aqueous solution of m-phenylenediamine with a concentration of 2% by weight, and discharge the liquid after contacting it for 10 seconds at 25°C; then, contact the upper surface of the support layer with a solution containing 0.1% by weight of trimesoyl chloride. Isopar E solution, after contacting for 10s at 25°C, drained; then, the film was put into an oven and heated at 70°C for 3min to obtain a composite film; Amino acid and 0.2% by weight of 4-dimethylaminopyridine aqueous solution were contacted for 1 min, drained, the film was put into an oven, and heated at 60°C for 5 min to obtain a surface-modified film N1, wherein the thickness of the surface-modified layer was 0.014 μm, the thickness of the support layer is 115 μm, the thickness of the polyamide separation layer is 0.20 μm, and the thickness of the reinforcement layer is 75 μm.

[0062] After immersing the obtained composite membrane N1 in wa...

Embodiment 2

[0064] Contact the upper surface of the polysulfone support layer with an aqueous solution of m-phenylenediamine with a concentration of 2% by weight, and discharge the liquid after contacting it for 10 seconds at 25°C; then, contact the upper surface of the support layer with a solution containing 0.1% by weight of trimesoyl chloride. Isopar E solution, discharge after contacting at 25°C for 10s; then, put the film into an oven and heat at 70°C for 3min to obtain a composite film; mix the polyamide surface of the obtained composite film with 5% by weight of N'- (4-Methoxy-2,3,6-trimethylbenzenesulfonyl)-L-arginine and 0.5% by weight pyridine aqueous solution were contacted for 1 min, drained, and the film was put into an oven at 60° C. The surface modified membrane N2 was obtained by heating for 5 minutes, wherein the thickness of the surface modification layer was 0.022 μm, the thickness of the support layer was 115 μm, the thickness of the polyamide separation layer was 0.22...

Embodiment 3

[0067]Contact the upper surface of the polysulfone support layer with an aqueous solution of m-phenylenediamine with a concentration of 2% by weight, and discharge the liquid after contacting it for 10 seconds at 25°C; then, contact the upper surface of the support layer with a solution containing 0.1% by weight of trimesoyl chloride. Isopar E solution, after contacting at 25°C for 10s, drained; then, the film was put into an oven and heated at 70°C for 3min to obtain a composite film; After contacting the aqueous solution of methyl-L-arginine monoacetate and 1% by weight 2-picoline for 1 min, drain the liquid, put the film into an oven, and heat at 60°C for 5 min to obtain the surface-modified film N3. Among them, the thickness of the surface modification layer is 0.03 μm, the thickness of the support layer is 115 μm, the thickness of the polyamide separation layer is 0.19 μm, and the thickness of the reinforcement layer is 75 μm.

[0068] After immersing the obtained composi...

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Abstract

The invention discloses a composite membrane, a preparation method thereof and application of the composite membrane in a water treatment process. The composite membrane comprises a supporting layer,a reinforcing layer and a polyamide separation layer, wherein the supporting layer is a polymer porous membrane, one surface of the supporting layer is attached to the reinforcing layer, the other surface of the supporting layer is attached to one surface of the polyamide separation layer, and the other surface of the polyamide separation layer is a guanidyl-containing surface modification layer.According to the composite membrane provided by the invention, guanidyl is introduced into the surface of the polyamide membrane in a grafting or crosslinking manner, so that the salt rejection rate and the antibacterial activity of the membrane are improved, and the composite membrane can run for a long time while the performance is kept stable.

Description

technical field [0001] The invention relates to the field of separation membranes, in particular to a composite membrane, a preparation method of the composite membrane and an application of the composite membrane in a water treatment process. Background technique [0002] Nanofiltration and reverse osmosis are currently the most widely used water treatment technologies that rely on pressure to achieve separation. The pore size range of the nanofiltration membrane is about a few nanometers, and the removal of monovalent ions and organic compounds with a molecular weight of less than 200 is poor, while the removal of divalent or multivalent ions and organic compounds with a molecular weight between 200 and 500 is relatively high. The removal rate can be widely used in water softening, drinking water purification, water quality improvement, oil-water separation, wastewater treatment and reuse, seawater softening, and the classification, purification and concentration of dyes, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/02B01D69/12B01D69/10B01D67/00C02F1/44
CPCB01D67/0002B01D69/02B01D69/10B01D69/12B01D71/56C02F1/441C02F1/442
Inventor 张杨刘轶群潘国元于浩
Owner CHINA PETROLEUM & CHEM CORP
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