Double-sided asymmetrical-structure flat support membrane and preparation method and application thereof

A flat-supported, asymmetric technology, applied in the field of membrane separation technology and new materials, can solve problems such as many structural defects, inability to use in a wider range, and inability to use for a long time

Active Publication Date: 2015-04-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The flat support membrane prepared by the method provided by the above patent, because the casting solution is coated on the surface of the support, the membrane layer structure formed after phase inversion is usually single-sided asymmetric with large pores, transition pores and surface dense layer Structure, while the support body is mostly non-woven material, its service life and solvent re

Method used

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  • Double-sided asymmetrical-structure flat support membrane and preparation method and application thereof
  • Double-sided asymmetrical-structure flat support membrane and preparation method and application thereof
  • Double-sided asymmetrical-structure flat support membrane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0095] Example 1

[0096] The prepolymer polyamic acid (PAA) of polyimide is mixed with solvent N,N-dimethylacetamide (DMAc) and additive acetone, heated and stirred at high speed to obtain 15% PAA+3% acetone casting Membrane liquid, the viscosity of the material liquid is 8000mPa·s; the polyethylene mesh with a width of 50cm and a mesh size of 200μm as a support is placed vertically in the middle of the film-forming surface of the film-forming mechanism, and is connected with a motor-driven winding roller. The width of the film-forming surface is set to 58cm, and the distance between the film-forming surfaces is set to 200 microns; the casting liquid is added to the middle of the film-forming surface of the film-forming mechanism, and it is still for 10 minutes; the motor is turned on and the support body passes through the film at a linear speed of 15m / h. Membrane mechanism, the casting liquid is cast on both sides of the support body to form a film. After staying in the air fo...

Example

[0098] Examples 2-9

[0099] Follow the steps of Example 1, but the casting solution is of the type given in Table 1, and the properties of the obtained double-sided asymmetric structure flat support film are shown in Table 1.

[0100] Table 1

[0101]

Example Embodiment

[0102] Example 10

[0103] Mix polyacrylonitrile (PAN) with solvent N-methylpyrrolidone (NMP), additive polyvinylpyrrolidone (PVP), heat and stir at high speed to prepare 22% PAN+10% PVP casting solution, the viscosity of the material liquid is 92400mPa ·S. The stainless steel with a width of 100cm and a mesh size of 50μm is placed vertically in the middle of the film-forming surface of the film-forming mechanism and connected to the motor-driven winding roller. The film-forming surface width is set to 108cm, and the film-forming surface is straight. The spacing is set to 300 microns; the casting liquid is added to the middle of the film forming mechanism of the film forming mechanism, and it is static for 25 minutes; the motor is turned on, the support body passes through the film forming mechanism at a linear speed of 5m / h, and the casting film liquid runs in the film forming mechanism with the support body. The two sides are cast to form a film. After staying in the air for 2...

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PUM

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Abstract

The invention relates to a double-sided asymmetrical-structure flat support membrane and a preparation method and application thereof, belonging to the field of a membrane separation technology and a new material. The preparation method of the double-sided asymmetrical-structure flat support membrane comprises the following steps: setting a supporting body along a direction in parallel to the gravity direction, enabling the two surfaces of the supporting body to be both in contact with a casting solution, and treating the supporting body contacting the casting solution in a gel bath, wherein the casting solution comprises the following compositions in percentage by mass: 10%-30% of polymers, 3%-20% of additives, and the balance of organic solvents, and the viscosity of the casting solution is 2000-102000mPa.s. The double-sided asymmetrical-structure flat support membrane has the properties of being high in mechanical strength, uniform in compact porosity structure, good in solvent resistance, acid and base resistance and pollution resistance, easy to clean, and the like, and is applicable to the fine separation fields of nano-filtration, reverse osmosis, gas separation and the like, and to treatment of systems containing solvents, strong acid and base solutions and sewage.

Description

technical field [0001] The invention relates to a flat support membrane with double-sided asymmetric structure and its preparation method and application, belonging to the field of membrane separation technology and new materials. Background technique [0002] Membrane separation technology is a new type of separation technology. Compared with traditional separation technologies, membrane separation has the advantages of high efficiency, energy saving, simple process, convenient operation, environmental friendliness, and easy integration and coupling with other technologies. Membrane material is the core of membrane separation technology. According to different shapes, membranes can be divided into several forms such as flat plate, tube, roll, and hollow fiber. Among them, the flux of flat membrane is higher, the preparation process is simple, the separation conditions are easy to control, the mechanical strength is higher, and the service life is longer. It plays a dominan...

Claims

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Application Information

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IPC IPC(8): B01D71/64B01D71/68B01D71/52B01D71/36B01D71/34B01D71/16B01D69/06B01D69/10B01D67/00
Inventor 李琳王同华王春雷刘峤金鑫
Owner DALIAN UNIV OF TECH
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