A modification method of polyamide thin film composite membrane, polyamide thin film composite membrane and application thereof

A polyamide film and composite membrane technology, applied in the field of membrane separation, can solve the problems of low water flux, high membrane fouling tendency, and low membrane fouling tendency of polyamide thin film composite membranes, and achieve antibacterial and membrane fouling tendency Effect of low, hydrophilicity increase

Inactive Publication Date: 2020-09-08
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the above defects or improvement needs of the prior art, the invention provides a modification method of polyamide thin film composite membrane, a modified high-performance polyamide thin film composite membrane for water treatment and its application, the purpose of which is to pass The surface modification of the polyamide layer of the polyamide thin film composite membrane is prepared to prepare a thin film composite membrane with good hydrophilicity, large water flux, low reverse salt flux, low membrane fouling tendency and antibacterial. The technical problems of low water flux and high membrane fouling tendency of the polyamide thin film composite membrane prepared by the prior art

Method used

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  • A modification method of polyamide thin film composite membrane, polyamide thin film composite membrane and application thereof
  • A modification method of polyamide thin film composite membrane, polyamide thin film composite membrane and application thereof
  • A modification method of polyamide thin film composite membrane, polyamide thin film composite membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The polymer support layer of the composite membrane in Example 1 is a polysulfone microfiltration membrane. The preparation process of the composite film comprises the following steps;

[0061] (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. The polysulfone-based membrane was completely soaked in the aqueous phase solution for 2 minutes and then taken out.

[0062] (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 monomer and the acid chloride monomer occurs at the interface of the two phases to ...

Embodiment 2

[0065] The polymer support layer of the composite membrane in Example 2 is a polysulfone microfiltration membrane. The preparation process of the composite film comprises the following steps;

[0066] (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. The polysulfone-based membrane was completely soaked in the aqueous phase solution for 2 minutes and then taken out.

[0067] (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 monomer and the acid chloride monomer occurs at the interface of the two phases t...

Embodiment 3

[0071] The polymer support layer of the composite membrane in Example 3 is a polysulfone microfiltration membrane. The preparation process of the composite film comprises the following steps;

[0072] (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. The polysulfone-based membrane was completely soaked in the aqueous phase solution for 2 minutes and then taken out.

[0073] (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 monomer and the acid chloride monomer occurs at the interface of the two phases t...

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Abstract

The invention discloses a modifying method for a polyamide film composite film, a modified polyamide film composite film and application thereof. The composite film comprises a polymer supporting layer and an initial polyamide layer, wherein the initial polyamide layer is prepared from polyamine and polyacyl chloride through interface polymerization reaction; the initial polyamide layer is subjected to surface modification to obtain a modified polyamide layer; surface modification comprises performing surface grafted polyamine compound treatment, surface grafted organic acid treatment, surfacemineralization treatment and surface atomization treatment on the initial polyamide layer in sequence; and the polyamide film composite film obtained by the modifying method has good hydrophilcity and contains antibacterial metal atoms on the surface, so that when being applied to membrane separation, the polyamide film composite film has obviously improved water flux and antibacterial and anti-pollution performance.

Description

technical field [0001] The invention belongs to the field of membrane separation, and more specifically relates to a modification method of a polyamide thin film composite membrane, a polyamide thin film composite membrane and applications thereof. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/56B01D69/12B01D69/02C02F1/44
CPCB01D67/0093B01D69/02B01D69/125B01D71/56B01D2325/36B01D2325/48C02F1/44
Inventor 王艳申亮王芳倩
Owner HUAZHONG UNIV OF SCI & TECH
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