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Polyamide film composite membrane and preparation method and application thereof

A polyamide and composite membrane technology, applied in the field of membrane separation, can solve the problems of polyamide thin film composite membrane selection layer not dense enough, large surface roughness, high membrane fouling tendency, achieve good anti-pollution performance, simplify the membrane making process, Effect of low membrane fouling tendency

Inactive Publication Date: 2017-07-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a high-performance polyamide thin film composite membrane and its preparation method and application. The catalysis of the tertiary amine is used to modify the polyamide layer to prepare a thin film composite membrane with large water flux, low reverse salt flux and low membrane fouling tendency, thereby solving the problem of polyamide prepared by the prior art. Thin film composite membrane selection layer is not dense enough, and the technical problems of large thickness, large surface roughness and high membrane fouling tendency

Method used

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  • Polyamide film composite membrane and preparation method and application thereof
  • Polyamide film composite membrane and preparation method and application thereof
  • Polyamide film composite membrane and preparation method and application thereof

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preparation example Construction

[0042] The present invention also provides a preparation method of the composite membrane, comprising the steps of:

[0043] (1) Prepare a polyamine aqueous solution containing a tertiary amine additive, adjust the pH to 8-11, soak the polymer support layer in the polyamine aqueous solution containing a tertiary amine additive, take it out after fully soaking, and obtain the treated polymer support layer;

[0044] The aqueous phase polyamine solution includes a mass fraction of 1%-8%, preferably 1%-5% polyamine and 1%-8%, preferably 1%-5% tertiary amine additive, if the polyamine concentration is too low, it will As a result, the polyamide active layer formed by interfacial polymerization is not dense enough, and the selectivity of the composite membrane is low. If the concentration is too high, the polyamide active layer formed will be too dense, resulting in a decrease in water flux. When the concentration of the tertiary amine additive is too low, the modification effect is ...

Embodiment 1

[0054] Embodiment 1 (comparative example)

[0055] Example 1 is an example of the preparation of a polyamide composite membrane that has not been modified with a tertiary amine.

[0056] The polymer support layer of the polyamide composite membrane prepared in this embodiment is a polysulfone microfiltration membrane. No tertiary amine additives were added during the preparation of the composite membrane, including the following steps

[0057] (1) Prepare an aqueous phase solution, which contains 3.4% m-phenylenediamine polyamine in mass fraction. An organic phase solution of polybasic acid chlorides is prepared, and the solution uses n-hexane as a solvent and 0.15% of trimesoyl chloride as a solute in mass / volume fraction.

[0058] The polysulfone-based membrane was completely soaked in the aqueous phase solution for 2 minutes and then taken out.

[0059] (2) After removing the excess aqueous phase solution on the surface, pour the organic phase solution on the upper sur...

Embodiment 2

[0062] The polymer support layer of the composite membrane in Example 2 is a polysulfone microfiltration membrane. The preparation process of the composite membrane includes the following steps

[0063] (1) Prepare an aqueous phase solution, which contains 3.4% m-phenylenediamine polyamine and 1 wt% tertiary amine additive hexamethylenetetramine with a mass fraction of 3.4%. An organic phase solution of polybasic acid chlorides is prepared, and the solution uses n-hexane as a solvent and 0.15% of trimesoyl chloride as a solute in mass / volume fraction.

[0064] The polysulfone-based membrane was completely soaked in the aqueous phase solution for 2 minutes and then taken out.

[0065] (2) After removing the excess aqueous phase solution on the surface, pour the organic phase solution on the upper surface of the wetted polysulfone membrane, and pour off the excess organic phase solution after 1 minute of contact time. The interfacial polymerization reaction between the amine...

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Abstract

The invention discloses a polyamide film composite membrane and a preparation method and application thereof. The composite membrane comprises a polymer support layer and a polyamide active layer. The polyamide active layer is obtained by a reaction of a multielement acyl chloride solution and a polyamine aqueous solution containing a tertiary amine additive. In the preparation process, the polyamine aqueous solution containing the tertiary amine additive and the multielement acyl chloride solution undergo an interfacial polymerization reaction to produce the modified polyamide active layer so that the film-forming process is greatly simplified. The composite membrane has a high crosslinking degree and high compactness, and has a high water flux in membrane separation, a low reverse salt flux and good anti-fouling properties.

Description

technical field [0001] The invention belongs to the field of membrane separation, and more specifically relates to a polyamide film composite membrane and its preparation method and application. Background technique [0002] Thin film composite membrane (TFC membrane) is a kind of polymer membrane commonly used in membrane separation process. Polyamide thin film composite membrane is prepared by the reaction of water phase polyamine or alcohol (phenol) and oil phase polyacyl chloride or isocyanate through interfacial polymerization. As a result, an ultra-thin active layer with a thickness of hundreds of nanometers and a rough peak-valley morphology is formed on the surface of the porous support layer. [0003] The traditional polyamide film composite membrane is a highly cross-linked aromatic polyamide structure obtained by the reaction of m-phenylenediamine in the water phase and trimesoyl chloride in the oil phase. This polyamide with a high degree of cross-linking is usua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D67/00C02F1/44
CPCB01D67/0006B01D69/10B01D69/12B01D71/56C02F1/444
Inventor 王艳申亮
Owner HUAZHONG UNIV OF SCI & TECH
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