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Composite polyamide film with salt concentration responsiveness, preparation method and use of composite polyamide film

A composite polyamide membrane and polyamide membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve high separation efficiency and high efficiency separation effect

Active Publication Date: 2019-10-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The composite polyamide membrane involved in the present invention exhibits salt concentration responsiveness, and its water flux will increase with the increase of salt concentration in the filtrate, which has never been reported

Method used

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  • Composite polyamide film with salt concentration responsiveness, preparation method and use of composite polyamide film
  • Composite polyamide film with salt concentration responsiveness, preparation method and use of composite polyamide film
  • Composite polyamide film with salt concentration responsiveness, preparation method and use of composite polyamide film

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Experimental program
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Effect test

Embodiment 1

[0028] Prepare the composite polyamide membrane as follows:

[0029] 1. Fix the asymmetric polysulfone ultrafiltration membrane (used as a support layer) in the glass plate and the Teflon frame, then pour the aqueous monomer solution into the Teflon frame, and soak the support layer for 1-10 minutes;

[0030] 2. Pour out the aqueous monomer solution, and use high-pressure gas to dry the surface water of the support layer (or use a rubber roller to remove the water). Then pour the oil phase monomer solution onto the surface of the support layer, and the interfacial polymerization reaction takes 30-600 seconds;

[0031] 3. Pour off the oil phase monomer solution, and store the prepared composite polyamide membrane in distilled water at 4°C.

[0032] Among them, the aqueous phase monomer solution may be an aqueous solution of L-lysine; the oil phase monomer solution may be a n-hexane solution (0.1 wt%) of trimesoyl chloride. In this example, all samples are represented by Lx, where x re...

Embodiment 2

[0037] Prepare the composite polyamide membrane as follows:

[0038] 1. Fix the asymmetric polysulfone ultrafiltration membrane (used as a support layer) in the glass plate and the Teflon frame, then pour the aqueous monomer solution into the Teflon frame, and soak the support layer for 1-10 minutes;

[0039] 2. Pour out the aqueous monomer solution, and use high-pressure gas to dry the surface water of the support layer (or use a rubber roller to remove the water). Then pour the oil phase monomer solution onto the surface of the support layer, and the interfacial polymerization reaction takes 30-600 seconds;

[0040] 3. Pour off the oil phase monomer solution, rinse the surface with n-hexane and dry it, immediately add the surface grafting water solution to react for 1-10 min. The prepared composite polyamide membrane was stored in distilled water at 4°C.

[0041] Among them, the aqueous monomer solution can be an aqueous solution of MPD or PIP (2wt%); the oil phase monomer solution...

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Abstract

The invention provides a composite polyamide film with salt concentration responsiveness, a preparation method and use of the composite polyamide film, and belongs to the technical filed of compositefilm preparation. The preparation method of the composite film comprises the following steps that (1), a support layer is fixed in a glass plate and a Teflon frame, aqueous phase monomer solution is poured into the Teflon frame, the support layer is soaked for 1-10 minutes; (2), the aqueous phase monomer solution is outwelled, surface moisture of the support layer is removed, then oil phase monomer solution is poured into the surface of the support layer, interface polymerization reaction is conducted for 30-600s; and (3), the oil phase monomer solution is outwelled, the prepared composite polyamide film is placed in distilled water at 4 DEG C to be saved. According to the composite polyamide film, the peculiar salt concentration response characteristics is provided, water flux of the composite polyamide film can increase with increase of salt concentration in raw material solution. Small organic molecules such as salt and dye in the raw material solution can be effectively separated,and very high separation efficiency is provided.

Description

Technical field [0001] The invention belongs to the technical field of membrane material preparation, and specifically relates to a composite polyamide membrane with salt concentration responsiveness and a preparation method and use thereof. This type of composite polyamide membrane has peculiar salt concentration response characteristics, and its water flux is With the change of the salt concentration in the raw material liquid, there is a significant change. Background technique [0002] The technology of interfacial polymerization to prepare polyamide selective membranes started in 1972 and was invented by Caddote, and the polyamide membrane prepared by this method was named polyamide thin-film composite membrane. It consists of a non-woven fabric backing layer, a polymer porous support layer (such as a polysulfone porous support layer prepared by a phase separation method) and a polyamide selective layer. The implementation method of the interfacial polymerization method is ...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00C02F1/44C02F101/30C02F101/12
CPCB01D67/0006B01D69/12B01D71/56C02F1/44C02F2101/12C02F2101/308
Inventor 亢健徐瑞璋向明曹亚杨锋陈丹丹刘天宇陈雪冰伍韵琪
Owner SICHUAN UNIV
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