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Composite membrane and preparation method thereof

A composite membrane and base membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of limited improvement in the degree of bonding between the base membrane and the functional layer, achieve good application prospects, and improve the firmness of the bond The effect of simple preparation process

Active Publication Date: 2015-12-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement of the binding degree of the base film and the functional layer by physical methods is relatively limited. The interface is only bound by van der Waals force, shape, dipole and other interactions, and there is no strong covalent bond.
At present, there are few reports on the use of chemical bonds between the base film and the functional layer to improve the performance of polyamide composite membranes.

Method used

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  • Composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] a Preparation of base film:

[0016] Add 120g of N-methylpyrrolidone and 14g of polyethersulfone into a reactor equipped with a stirring paddle, activate at 500°C for 1 hour, add 4g of calcium chloride, raise the temperature to 50°C under nitrogen protection, and stir to form a homogeneous solution , cooled to room temperature, added 4.32g of p-phenylenediamine, cooled in an ice-water bath after dissolving, added 8.56g of terephthaloyl chloride, and stirred for 1 hour to obtain a casting solution. The above-mentioned blend solution was vacuum-degassed for 12 hours, then evenly scraped on a clean glass plate, and immersed in a coagulation bath of 30 wt% ethanol aqueous solution to form a film. The pure water flux of the flat membrane prepared at room temperature is 160L.m -2. h -1. bar, PEG20000 rejection rate 98%.

[0017] b Preparation of composite membrane

[0018] The base film is immersed in an aqueous solution of m-phenylenediamine with a mass concentration of ...

example 2

[0025] a Basement film preparation

[0026] According to the following components and ingredients: 80wt% N,N-dimethylacetamide, 5wt% sulfonated polyethersulfone, 3.5wt% lithium chloride, wherein the lithium chloride was activated at 600°C for 4 hours in a nitrogen atmosphere; The system was heated up to 65°C, stirred to a homogeneous solution, cooled to room temperature and added a certain amount of p-phenylenediamine, after dissolving, cooled to 0°C in an ice-water bath, then added stoichiometric terephthaloyl chloride, stirred for 2 hours to obtain a cast film liquid. After vacuum defoaming the above blend solution for 24 hours, evenly scrape-coat it on a clean glass plate, and immerse it in an aqueous solution of 10wt% N,N-dimethylacetamide to form a film. The pure water flux of the flat membrane prepared at room temperature is 250L.m -2. h -1 , PEG20000 rejection rate is 91%.

[0027] b Preparation of composite membrane

[0028] The base film was soaked in the aqueous...

example 3

[0030] a Basement film preparation

[0031] Set the intrinsic viscosity to 2.2dl.g -1 The cellulose diacetate is added in the solvent dimethyl sulfoxide, according to the following components and composition batching: dimethyl sulfoxide 65wt%, cellulose diacetate 12wt%, calcium chloride 5.6wt%, triethylamine 1.4wt% %, in which calcium chloride was activated at 500°C for 4 hours; heated to 50°C under the protection of nitrogen flow, stirred to form a homogeneous solution, cooled to room temperature and added a certain amount of p-phenylenediamine, and cooled to 0 in an ice-water bath after dissolving After adding stoichiometric amount of 4,4-diaminodiphenyl ether and terephthaloyl chloride, stir rapidly for 3 hours to obtain a casting solution.

[0032] Slowly pour the above blend into a hollow fiber spinning kettle, heat to 50° C., and vacuum defoam for 24 hours, then use 20 wt % N-methylpyrrolidone as a coagulation bath. The pure water flux of the composite membrane prepare...

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Abstract

The invention discloses a composite membrane and a preparation method, aims at improving the bonding firmness between a functional layer and a basement membrane and the pressure resistance of the composite membrane and belongs to the field of the preparation of blended high polymer materials and polymeric membranes. According to the method, casting membrane solution containing amino and carboxyl is prepared through an in-situ hybrid polymerization method; the basement membrane is prepared by adopting an immersion phase inversion method to enable the surface of the basement membrane to contain carboxyl and amino radicals, and the basement membrane is bonded with the functional layer through chemical bonds and hydrogen bond, so that the bonding firmness between the functional layer and the basement membrane is improved, and the pressure resistance of the composite membrane is increased.

Description

technical field [0001] The invention relates to a novel polyamide composite membrane and a preparation method thereof. Background technique [0002] At present, polyamide thin-layer composite membranes (TFCs) have been widely used in the desalination of brackish water or seawater, wastewater recovery, separation and purification of chemical and biological products, etc. The multilayer composite film generally includes an ultra-thin functional layer with a thickness of 100-200 nm and a porous base film with a thickness of about 50-200 μm. The actual separation selectivity is determined by the ultra-thin functional layer, while the porous base membrane plays the role of support and attachment. Interfacial polymerization has become a common method for preparing functional layers of high-performance composite membranes due to its advantages of simple operation and easy control, and has been widely used in the field of membrane technology. [0003] The interfacial polymerizatio...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 张宇峰刘冬青石强倪磊杨彬杜西兰
Owner TIANJIN POLYTECHNIC UNIV
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