Preparation method of anti-pollution polyamide film composite film

A polyamide thin film, composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reducing the feasibility of large-scale production and application, increasing the preparation cost, complex steps, etc. The effect of membrane fouling flux attenuation rate reduction, easy large-scale industrial production, and convenient operation

Inactive Publication Date: 2019-06-25
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Looking at all kinds of data, it can be seen that the existing technical measures are mainly divided into two categories: TFC membrane surface grafting and surface coating. This will significantly increase the cost of membrane preparation and reduce the feasibility of its large-scale production and application.

Method used

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  • Preparation method of anti-pollution polyamide film composite film
  • Preparation method of anti-pollution polyamide film composite film
  • Preparation method of anti-pollution polyamide film composite film

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides a method for preparing an anti-pollution polyamide film composite reverse osmosis membrane (RO), the specific steps are as follows:

[0032] 1. Prepare an aqueous monomer solution containing calcium ions: respectively select m-phenylenediamine (MPD) and anhydrous calcium chloride as the aqueous film-forming monomer and water-soluble calcium salt, and mix m-phenylenediamine (MPD) and Anhydrous calcium chloride was added to water, and then stirred continuously under constant temperature (25° C.) until completely dissolved to obtain a mixed solution. The concentration of MPD in the solution was 3.0 wt%, CaCl 2 The concentration is 1.0wt%;

[0033]2. Interfacial polymerization: The surface of the porous flat ultrafiltration membrane with a molecular weight cut-off of 150,000 Daltons prepared by polysulfone material is immersed in the aqueous phase monomer solution containing calcium ions prepared in step 1, soaked for 2 minutes, and then used The a...

Embodiment 2

[0038] This embodiment provides another preparation method of anti-pollution polyamide film composite reverse osmosis membrane (RO), the specific steps are as follows:

[0039] 1. Preparation of aqueous monomer solution containing calcium ions: respectively select p-phenylenediamine (PPD) and anhydrous calcium iodide as aqueous film-forming monomer and water-soluble calcium salt, add PPD and anhydrous calcium iodide into water, then continuously stirred under constant temperature until completely dissolved to obtain a mixed solution, the concentration of PPD in the solution is 2.0wt%, CaI 2 The concentration is 0.4wt%;

[0040] 2. Interfacial polymerization: immerse the surface of a porous flat ultrafiltration membrane with a molecular weight cut-off of 100,000 Daltons prepared from polyethersulfone material in the aqueous monomer solution containing calcium ions prepared in step 1, soak for 1 min, and then Use an air knife to remove visible liquid droplets on the surface of ...

Embodiment 3

[0045] Different from specific examples 1 and 2, this example provides a method for preparing an anti-pollution polyamide film composite forward osmosis membrane, and the specific steps are as follows:

[0046] 1. First prepare a polysulfone porous support membrane without a non-woven fabric layer: mix the film-forming polymer polysulfone with a molecular weight of 140,000 to 150,000 Daltons, additives and solvents, stir for 24 hours under sealed conditions, and then Place the defoaming naturally under sealed conditions for 16 hours to obtain the polysulfone casting solution, and then prepare the polysulfone casting solution into a support layer in the form of a flat plate by a non-solvent-induced phase inversion method, wherein the thickness of the scraping film is controlled to be 100 microns; The solvent is N-methylpyrrolidone, and the additive is ethylene glycol; the mass fraction of polysulfone in the polysulfone casting solution is 15wt%, and the concentration of ethylene...

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Abstract

The invention discloses a preparation method of an anti-pollution polyamide film composite film. The preparation method comprises following steps: a water-soluble divalent metal salt and a water phasemonomer are added into water respectively so as to obtain a water phase monomer solution containing divalent metal ions; a porous support layer surface is immersed in the water phase monomer solutioncontaining divalent metal ions, is taken out from the water phase monomer solution containing divalent metal ions, and is immersed in an organic phase monomer solution for immersion; and at last, slaking treatment is carried out so as to obtain the anti-pollution polyamide film composite film. The preparation method possesses following advantages: the pertinence is high, cost is low, the obtainedproduct is nontoxic, the technology is simple, operation is convenient, and the preparation method is convenient for large scale industrialized production.

Description

technical field [0001] The invention belongs to the technical field of preparation of polyamide thin film composite membranes, and in particular relates to a technical method for effectively improving the anti-pollution ability of polyamide thin film composite membranes. Background technique [0002] With the growth of the world's population and the continuous advancement of urbanization and industrialization, the problem of water shortages on a global scale continues to intensify. Water treatment technology based on membrane separation processes is a powerful tool to deal with water shortages, especially reverse osmosis, Forward osmosis and nanofiltration, three types of membrane technologies with fine separation functions, have played an important role in many aspects such as brackish water desalination, seawater desalination, and sewage regeneration and reuse. At present, the polyamide thin film composite membrane (TFC membrane) prepared by interfacial polymerization occu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D67/00B01D61/02C02F1/44
Inventor 田家宇郝秀娟张瑞君高珊珊李相昆
Owner HEBEI UNIV OF TECH
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