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Polyamide composite membrane and preparation method thereof

A composite membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of ineffective membrane performance improvement, membrane performance degradation, and affecting the stability of the water-oil phase solution. Achieve the effects of thin functional layer, dense structure and increased crosslinking degree

Active Publication Date: 2018-06-08
湖南澳维膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the polyamide composite membrane, the addition of a small amount of these traditional additives does not significantly improve the membrane performance, and the addition of too much will affect the stability of the water-oil phase solution, resulting in a sharp decline in membrane performance.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A polyamide composite membrane, comprising a composite membrane body, the composite membrane body is a flat membrane, specifically including a non-woven fabric, a porous support layer and a polyamide layer arranged in sequence from bottom to top, and the polyamide layer is composed of polyamine solution It is prepared by interfacial polymerization reaction with polyacyl chloride solution, wherein the polyamine is a polyamine with a star molecular structure. The composite membrane body can also be designed as a non-woven fabric, a porous support layer and a polyamide layer arranged from the inside to the outside, specifically, it can be designed as a hollow fiber membrane or a tubular membrane to meet different needs.

[0047] The preparation process of the above-mentioned polyamide composite membrane is as follows:

[0048] The first step, the preparation of polyamine solution, specifically: take trimesoyl-m-phenylenediamine 240g, triethylamine 88g, camphorsulfonic acid...

Embodiment 2

[0066] A kind of polyamide composite film, difference with embodiment 1 is: (1) the preparation of polyamine solution, specifically: take trimesoyl-o-phenylenediamine 240g, triethylamine 88g, camphorsulfonic acid 184g And sodium dodecylsulfonate 8g is dissolved in 7480g water, stirs to obtain polyamine solution; (2) trimesoyl-o-phenylenediamine is as follows:

[0067]

[0068] (3) The synthesis method of trimesoyl-o-phenylenediamine is similar to the examples, except that the reaction monomer is o-nitroaniline.

[0069] The chemical structure of the synthesized product analyzed by Fourier transform infrared spectrometer (FTIR) is similar to that of Example 1.

[0070] Take the diaphragm and test it on a cross-flow diaphragm testing platform. The test conditions are: sodium chloride aqueous solution 1500ppm, operating pressure 150psi, test temperature 25°C, and pH value 6.5-7.5. The results are shown in Table 1.

[0071] The cross-linking degree test of the functional layer...

Embodiment 3

[0074] A kind of polyamide composite film, difference with embodiment 1 is: (1) the preparation of polyamine solution, specifically: take trimesoyl-p-phenylenediamine 240g, triethylamine 88g, camphorsulfonic acid 184g And sodium dodecylsulfonate 8g is dissolved in 7480g water, stirs to obtain polyamine solution; (2) trimesoyl-p-phenylenediamine is as follows:

[0075]

[0076] (3) The synthesis method of trimesoyl-p-phenylenediamine is similar to that in the examples, except that the reaction monomer is p-nitroaniline.

[0077] The chemical structure of the synthesized product analyzed by Fourier transform infrared spectrometer (FTIR) is similar to that of Example 1.

[0078] Take the diaphragm and test it on a cross-flow diaphragm testing platform. The test conditions are: sodium chloride aqueous solution 1500ppm, operating pressure 150psi, test temperature 25°C, and pH value 6.5-7.5. The results are shown in Table 1.

[0079] The cross-linking degree test of the function...

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Abstract

The invention provides a polyamide composite membrane which is characterized by comprising a composite membrane body, wherein the composite membrane body comprises non-woven cloth, a porous support layer and a polyamide layer arranged sequentially; the polyamide layer is prepared by an interfacial polymerization reaction of a polyamine solution and a polyacyl chloride solution; and polyamine has astar type molecule structure. Polyamine with the star type molecule structure has the following advantages that: a, more cross-linked structure are easily formed during interfacial polymerization, sothat a nascent membrane structure is more compact; b, due to higher molecular weight and larger molecular dimension, polyamine more difficultly penetrates through the nascent membrane to continue toreact with trimesoyl chloride; and a formed functional layer is thinner; and c, during the subsequent interfacial polymerization with trimesoyl chloride, the original carbon skeleton is not changed todamage the performance of the membrane. The invention further discloses a preparation method of the polyamide composite membrane. The preparation method has the characteristics of simplified technology, easy control of technical parameters, good quality and the like.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a polyamide composite membrane and a preparation method thereof. Background technique [0002] Polyamide composite membrane is the most widely used composite membrane variety. Its structure is through interfacial polymerization on the non-woven polysulfone support layer (interfacial polymerization refers to: two kinds of monomers are dissolved in two kinds of incompatible materials, respectively). The polycondensation reaction carried out on the interface of the solution or the organic phase side of the interface) forms a polyamide separation layer (such as US5160619, CN1724130A etc.). The polyamide composite membrane has the advantages of high rejection rate, large flux, excellent chemical stability, wide pH range (4-11), and low operating pressure requirements. Water flux is one of the most important performance parameters of polyamide composite membranes. The higher the wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00C02F1/44
CPCB01D67/0006B01D69/125B01D71/56C02F1/44
Inventor 彭博路宏伟胡群辉喻慧贺攀
Owner 湖南澳维膜科技有限公司
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