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High-flux polyamide composite film

A composite membrane and polyamide technology, which is applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of insignificant improvement in membrane performance, affecting the stability of water-oil phase solution, and decreasing membrane performance. Achieve the effect of improving water permeability, facilitating mass production, and improving performance

Inactive Publication Date: 2015-03-25
HUNAN OVAY TECH CO LTD
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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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  • High-flux polyamide composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A large-flux 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 The polyamine solution and the polyacyl chloride solution are prepared through interfacial polymerization, wherein the polyamine solution contains serine. 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.

[0037] The chemical structural expression of the polyamide layer is:

[0038]

[0039] Where: X stands for -NHCH(COOH)CH 2 OH group (ie, the group obtained by removing one hydrogen from the amino group of serine); m>0, n>0, and m+n=1.

[0040] The preparation process of the above-men...

Embodiment 2

[0047] A kind of large-flux polyamide composite membrane, differs from Example 1 in that: (1) the preparation of polyamine aqueous phase solution, specifically: take m-phenylenediamine 240g, serine 2.4g, triethylamine 88g, 184g of camphorsulfonic acid and 8g of sodium dodecylsulfonate were dissolved in 7477.6g of water, and stirred evenly to obtain a polyamine aqueous phase solution; (2) in the chemical structure expression of the polyamide layer, X represents -NHCH(COOH)CH 2 OH group.

[0048] The surface of the large-flux polyamide composite membrane of the present invention (Example 2) is looser than that of the traditional polyamide composite membrane (Comparative Example), has a larger specific surface area, and is more conducive to the penetration of water molecules.

[0049] 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...

Embodiment 3

[0051] A kind of large-flux polyamide composite membrane, differs from Example 1 in that: (1) the preparation of polyamine aqueous phase solution, specifically: take m-phenylenediamine 240g, lysine 2.4g, triethylamine 88g, 184g of camphorsulfonic acid and 8g of sodium dodecylsulfonate were dissolved in 7477.6g of water, and stirred evenly to obtain a polyamine aqueous phase solution; (2) in the chemical structure expression of the polyamide layer, X represents -NHCH(COOH)CH 2 CH 2 CH 2 CH 2 NH 2 group.

[0052] The surface of the large-flux polyamide composite membrane of the present invention (Example 3) is looser than that of the traditional polyamide composite membrane (Comparative Example), has a larger specific surface area, and is more conducive to the penetration of water molecules.

[0053] 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 tem...

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Abstract

The invention provides a high-flux polyamide composite film. The high-flux polyamide composite film comprises a composite film body, wherein the composite film body comprises non-woven cloth, a porous support layer and a polyamide layer which are sequentially arranged; the polyamide layer is prepared by performing reaction on a polyamine solution and a poly-acyl chloride solution by means of interface polymerization, wherein the poly-acyl chloride solution comprises amino acid. The amino acid adopted in the technical scheme can be used as an end-capping reagent to react with acyl chloride groups to regulate a polyamide layer structure, so that the crosslinking degree of the polyamide layer is reduced, and a path is opened for passing of water molecules; the hydrophilic performance of the film surface can also be improved, and the water flux is increased while the reject rate is guaranteed.

Description

technical field [0001] The invention relates to the field of membrane preparation, in particular to a large-flux polyamide composite membrane. 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 water flux, the lower th...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/56
CPCB01D71/56B01D69/1251B01D69/06
Inventor 彭博路宏伟胡群辉喻慧贺攀王进刘旦王纯清刘鹏君
Owner HUNAN OVAY TECH CO LTD
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