Hydrophilic composite film containing ether groups in surface layer

A composite membrane and hydrophilic technology, which is applied in the direction of membrane technology, semipermeable membrane separation, chemical instruments and methods, etc., can solve the problems of easy pollution and poor hydrophilicity of the surface layer of the composite membrane, so as to improve the service life and improve the hydrophilicity. Water-based, the effect of reducing membrane fouling

Inactive Publication Date: 2013-11-27
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The surface layer of the prepared composite membrane ha

Method used

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  • Hydrophilic composite film containing ether groups in surface layer
  • Hydrophilic composite film containing ether groups in surface layer
  • Hydrophilic composite film containing ether groups in surface layer

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] Dissolve 15g of double-ended aminodiglycol in 50ml of deionized water, prepare a concentration of 3% (w / v) aqueous solution, add 6g of triethylamine, apply to the surface of the polysulfone flat ultrafiltration membrane basement membrane, and dry in the air . Dissolve 5g of isophthaloyl chloride (II) in 10ml of cyclohexane to prepare a solution with a concentration of 5% (w / v), apply it to the above-mentioned dry surface, let it stand at room temperature for 30 minutes, and place the film on Excess monomers and by-products were removed in deionized water.

Example Embodiment

[0030] Example 2

[0031] Dissolve 6g of double-ended amino diglycol in 20ml of deionized water to prepare an aqueous solution with a concentration of 3% (w / v). Immerse the outer surface of the polyethersulfone hollow fiber microfiltration membrane in this aqueous solution for 10 minutes, take it out and let it dry in the air. Dry. Triisocyanate toluene (III 1 ) 2g was dissolved in 10ml of n-hexane to prepare a solution with a concentration of 2% (w / v). The above-mentioned treated hollow fiber membrane was immersed in it for 2 minutes, and reacted at 40°C for 30 minutes. Deionized water removes excess monomers and by-products.

Example Embodiment

[0032] Example 3

[0033] Dissolve 9g of double-ended aminodiglycol in 30ml of deionized water, and prepare an aqueous solution with a concentration of 3% (w / v), add 6g of triethylamine, coat the surface of the polyvinyl chloride ultrafiltration membrane base membrane, and dry in the air . Triphenylmethane triisocyanate (III 2 ) 7g was dissolved in 10ml of n-hexane to prepare a solution with a concentration of 7% (w / v), coated on the above-mentioned dried surface, and placed at a temperature of 30°C for 20 minutes, and the membrane was placed in deionized water to remove excess monomers and by-products.

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Abstract

The invention relates to a composite film containing polyether groups in a surface layer and a preparation method thereof, belonging to the technical field of preparation of film materials. According to the preparation method disclosed by the invention, an interfacial polymerization method is utilized, the polyether groups with good hydrophilicity are introduced into the surface layer of the composite film so as to prepare the surface layer containing the hydrophilic polyether groups of the composite film. The preparation method is characterized by coating a water solution of water-soluble linear diamine on the surface layer of a flat plate or a hollow fiber ultrafiltration film, air-drying, further coating an organic solvent solution containing acyl chloride or isocyanate groups, further performing interfacial polymerization, and forming a skin layer containing the hydrophilic groups on a support body of the ultrafiltration film so that the surface chemical structure of the film has a hydrophilic chain structure, the hydrophobic property of a base film is improved and the anti-pollution capability of the film material is enhanced. The composite film can be applied to removing organic and inorganic molecules and particles dissolved in water.

Description

technical field [0001] The invention relates to a hydrophilic composite membrane containing ether groups on the surface and a preparation method thereof, in particular to a polymer organic membrane used in water treatment and chemical separation processes. Background technique [0002] Coating a layer of polyamide film on the surface of the microfiltration base membrane by interfacial polymerization can obtain ultrafiltration membranes and reverse osmosis membranes with smaller surface pores, which is an important method for preparing composite membranes. Apply the water phase monomer piperazine or diamine monomer to the surface of the base film, and react the oil phase monomer trimesoyl chloride dissolved in cyclohexane with the coated monomer on the film surface after drying. A relatively dense film is formed on the surface of the membrane, which can be used in desalination and various water treatment fields. [0003] At present, the water-phase diamine monomers used in t...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D71/52
Inventor 刘冬青靳进波张宇峰张力婉孟令波尹宇航
Owner TIANJIN POLYTECHNIC UNIV
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