Preparation method of high-permeability thermal crosslinking membrane

A high-permeability, thermal cross-linking technology, applied in the field of membrane separation technology and new materials, can solve the problems of membrane permeability reduction, pore structure fusion, etc., and achieve the effects of improving permeability, easy amplification, and wide adjustment range

Inactive Publication Date: 2020-01-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for easier control over how much material needs to be mixed with each other when create an insulating film that improves its performance without losing it's ability to pass water vapor or liquids effectively through them.

Problems solved by technology

This patented technical solution describes how it works well when separating or cleaning wastewater from other liquids like oil. It involves using special types of plastic called polyethylene (PE) with good chemical properties such as strength, durability, flexibility, etc., along with impervious layers made of rubbery material between them. These layers help prevent damage caused by heat while still allowing fluoropolymers inside to pass through properly. By doing this, these films are able to separate different substances effectively without contamination issues even at very harsh environments where traditional methods may cause harmful effects over time.

Method used

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  • Preparation method of high-permeability thermal crosslinking membrane
  • Preparation method of high-permeability thermal crosslinking membrane
  • Preparation method of high-permeability thermal crosslinking membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using polysulfone as the polymer, polyvinylpyrrolidone as the blending additive, and N,N-dimethylformamide as the organic solvent, after mixing according to the mass ratio of 10:1:89, stir at 900rpm at 100°C for 2h The casting solution is obtained, and the casting solution is scraped on the substrate to form a nascent film, and then immersed in a pure water gel bath at room temperature for phase inversion and solvent exchange for 12 hours to prepare a polysulfone asymmetric membrane. Dry the prepared asymmetric membrane at 40°C for 36h, place the dried membrane in a muffle furnace at a rate of 30°C / min, raise the temperature to 120°C, keep the temperature constant for 60h, and obtain a polysulfone-based heat exchange membrane after cooling down. Connected ultrafiltration membrane. The ultrafiltration performance of the membrane at a test pressure of 0.1 MPa is shown in Table 1.

Embodiment 2-12

[0025] According to the experimental method of embodiment 1, the difference from embodiment 1 is that polyethylene glycol, polymethyl methacrylate, polyvinyl acetate, carboxymethyl cellulose, polyvinyl alcohol, polyvinyl chloride, polystyrene Ethylene, polyvinylpyrrolidone / polyethylene glycol (mass ratio 1:2), polymethyl methacrylate / polyvinyl acetate (mass ratio 1:1), carboxymethyl cellulose / polyvinyl alcohol (mass ratio 3 : 2), polyvinyl chloride / polystyrene (mass ratio 2: 1) is a blending additive to prepare a casting solution. The ultrafiltration performance of the prepared polysulfone-based thermally cross-linked ultrafiltration membrane at a test pressure of 0.1 MPa is shown in Table 1.

[0026] Table 1

[0027]

Embodiment 13-18

[0029] Polyethersulfone, polyacrylonitrile, polyether ether ketone, polyarylether ketone, polyarylether nitrile, polyether nitrile ketone as polymer, polyvinylpyrrolidone as blending additive, N,N-dimethylacetamide as Organic solvents, mixed according to the mass ratio of 20:20:60, stirred at 20°C for 24 hours at a speed of 300rpm to obtain a casting solution, scraped the casting solution on the substrate to form a primary film, and then immersed in a pure water gel bath at room temperature Phase inversion and solvent exchange were performed for 12 hours to produce an asymmetric membrane. The prepared asymmetric membrane was dried at 30°C for 48h, and the dried membrane was placed in a muffle furnace at a heating rate of 0.1°C / min to 300°C, kept at a constant temperature for 20h, and then thermally crosslinked membrane was obtained after cooling down. The ultrafiltration performance of the prepared thermally crosslinked ultrafiltration membrane at a test pressure of 0.1 MPa is...

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Abstract

The invention relates to a preparation method of a high-permeability thermal crosslinking membrane, and belongs to the field of membrane separation technologies and new materials. The preparation method of the high-permeability thermal crosslinking membrane includes the steps of: dissolving a polymer and a blending additive into an organic solvent to prepare a membrane casting solution; preparinga porous membrane through a phase inversion method; drying the porous membrane and performing thermal crosslinking to prepare the high-permeability thermal crosslinking membrane, wherein the blendingadditive is one or a mixture of polyvinylpyrrolidone, polyethylene glycol, polymethyl methacrylate, polyvinyl acetate, carboxymethyl cellulose, polyvinyl alcohol, polyvinyl chloride and polystyrene. The blending additive added in the method not only can play a role in pore forming in the phase inversion process, but also can be decomposed in the thermal cross-linking process to form a new pore structure, so that the loss of membrane permeability caused by fusion and shrinkage of the pore structure in the thermal cross-linking process is compensated, and the permeability of the thermal cross-linking membrane is improved.

Description

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Claims

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Application Information

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Owner DALIAN UNIV OF TECH
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