A kind of polyamide composite film, its preparation method and application
A polyamide and composite membrane technology, applied in the field of membrane separation, can solve the problems of polyamide structure anisotropy restricting its application, cumbersome membrane production process, low monomer reaction efficiency, etc., achieving good separation performance and simplifying the membrane production process. , to promote the effect of mixing
Inactive Publication Date: 2020-06-02
HUAZHONG UNIV OF SCI & TECH +1
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Problems solved by technology
[0003] In order to solve the above technical problems, the present invention provides a polyamide composite membrane and its preparation method and application. By introducing an ultrasonic field in the interfacial polymerization process and optimizing the ultrasonic process parameters, a modified polyamide active layer is obtained. Thereby solving technical problems such as low monomer reaction efficiency in the preparation process of the traditional polyamide composite membrane, the anisotropy of the prepared polyamide structure restricts its application, and the cumbersome post-processing of the existing technology membrane-making process.
Method used
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Effect test
Embodiment 1
[0042] (1) Prepare a m-phenylenediamine aqueous solution with a mass fraction of 2%, completely immerse the polysulfone microfiltration membrane in the m-phenylenediamine aqueous solution for 2 minutes, then take it out, and drive off the aqueous solution on the surface of the polysulfone microfiltration membrane;
[0043] (2) preparation mass / volume fraction is the n-hexane solution of 0.1% trimesoyl chloride, pours this solution on a surface of the polysulfone microfiltration membrane treated through step (1) that is wetted, after contacting for 1min, pour it out Excess solution, in the interfacial polymerization process under the condition of ultrasonic field. The ultrasonic equipment used is an ultrasonic cleaner, the ultrasonic time is 1 min, the ultrasonic frequency is 40 Hz, and the ultrasonic power is 120 W.
Embodiment 2
[0045] The experimental operation is the same as that in Example 1, except that in step (2), the ultrasonic power is 240w.
Embodiment 3
[0047] The experimental operation is the same as that in Example 1, except that in step (2), the ultrasonic power is 360w.
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Abstract
Belonging to the membrane separation field, the invention relates to a polyamide composite membrane and a preparation method thereof. The composite membrane consists of a polymer support layer and a polyamide active layer. The polyamide active layer is prepared by ultrasonic-assisted interfacial polymerization of a polyamide aqueous solution and a polyacyl chloride solution, other steps are unnecessary, and the membrane preparation process is greatly simplified. The composite membrane has high water flux and low reverse salt flux, and the technical problems of low monomer reaction efficiency in the traditional polyamide composite membrane preparation process, restriction of the prepared polyamide structure's anisotropy on application, tedious post-treatment of the existing mold making technologies and the like are solved.
Description
technical field [0001] The invention belongs to the field of membrane separation, and more specifically relates to a polyamide composite membrane used for water treatment and its preparation method and application. Background technique [0002] Polyamide composite membrane is a kind of polymer membrane commonly used in membrane separation process. Polyamide composite membrane is prepared by the reaction of polyamine or alcohol (phenol) in water phase and polyacyl chloride or isocyanate in oil phase by interfacial polymerization. On the surface of the support layer, a dense ultra-thin active layer with a thickness of several hundred nanometers and a rough peak-valley morphology is formed. The traditional polyamide 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. However, in the process of interfacial polymerization, since m-phenylenediamine is sl...
Claims
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IPC IPC(8): B01D71/56B01D69/12B01D67/00
CPCB01D69/125B01D71/56
Inventor 王艳申亮
Owner HUAZHONG UNIV OF SCI & TECH