Preparation method of modified polyurethane-organosilicon double layer pervaporation membrane

A technology of pervaporation membrane and polyurethane membrane, applied in the field of pervaporation dephenolization membrane and its preparation, can solve problems such as complex process, achieve improved permeability and selectivity, ensure operation stability, strong innovation and application prospect. Effect

Inactive Publication Date: 2017-08-29
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past literature, the method of introducing the soft segment monomer of PU into the silicon component to re-synthesize is used, and the process is relatively complicated.

Method used

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  • Preparation method of modified polyurethane-organosilicon double layer pervaporation membrane
  • Preparation method of modified polyurethane-organosilicon double layer pervaporation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of polyurethane film layer. Put the PU particles into the solvent DMAc, and the mass of the PU particles accounts for 10% of the total mass of the solution. After being uniformly dissolved, add DCTB with 0.5% of the mass of the PU, and stir mechanically until dissolved. Cast to form a film, put it into a normal pressure oven and dry it at 80°C for 5 hours, then put it into a vacuum oven and dry it at 80°C for 12 hours. (2) Composite of silicone layer. Add polydimethylsiloxane (PDMS) to the solvent n-heptane, stir magnetically at 30°C for 15 minutes until dissolved, then add tetraethyl orthosilicate (crosslinking agent) and catalyst (dibutyl dilauric acid tin), and continue to stir at 30°C for 10 min until it dissolves and becomes viscous. Then scrape the casting solution on the modified PU film prepared in (1) (one side, the side exposed to the air), let it stand at room temperature for 10 h, then put it in a vacuum drying oven, and dry it at 80 ° C fo...

Embodiment 2

[0020] (1) Preparation of polyurethane film layer. The PU particles are put into the solvent DMAc, and the mass of the PU particles accounts for 10% of the total mass of the solution. After dissolving evenly, DCTB with 1% of the PU mass is added, and mechanically stirred until dissolved. Cast to form a film, put it into a normal pressure oven and dry it at 80°C for 5h, then put it into a vacuum drying oven and dry it at 150°C for 5h. (2) Composite of silicone layer. Add polydimethylsiloxane (PDMS) to the solvent n-heptane, stir magnetically at 30°C for 15 minutes until dissolved, then add tetraethyl orthosilicate (crosslinking agent) and catalyst (dibutyl dilauric acid tin), continue to heat and continue to stir at 30°C for 5 minutes until it dissolves and becomes viscous. Then scrape the casting liquid on the modified PU film prepared in (1) (one side, the side exposed to air), let it stand at room temperature for 10 h, then put it into a vacuum drying oven, and dry it at 1...

Embodiment 3

[0022] (1) Preparation of polyurethane film layer. Put the PU particles into the solvent DMAc, and the mass of the PU particles accounts for 10% of the total mass of the solution. After being uniformly dissolved, add DCTB with 0.5% of the mass of the PU, and stir mechanically until dissolved. Cast to form a film, put it into a normal pressure oven and dry it at 80°C for 5h, then put it into a vacuum drying oven and dry it at 150°C for 5h. (2) Composite of silicone layer. Add polydimethylsiloxane (PDMS) to the solvent n-heptane, stir magnetically at 30°C for 15 minutes until dissolved, then add tetraethyl orthosilicate (crosslinking agent) and catalyst (dibutyl dilauric acid tin), continue to stir at 30°C for 10 min until it dissolves and becomes viscous. Then scrape the casting solution on the modified PU film prepared in (1) (one side, the side exposed to the air), let it stand at room temperature for 10 h, then put it in a vacuum drying oven, and dry it at 80 ° C for 12 h....

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Abstract

The invention relates to a preparation method of a modified polyurethane-organosilicon double layer pervaporation membrane, and relates to the field of pervaporation membrane separation. The pervaporation membrane comprises two layers; an organosilicon film layer is a surface layer, a polyurethane film layer added with a modifier is a sub layer; (1) the polyurethane film layer is prepared as follows: polyurethane PU particles are put in solvent DMAc to obtain a solution, the mass of the PU particles accounts for 10% of the total mass of the solution, the modifier is added, and mechanically stirred to dissolve; and the film is formed by curtain coating and then dried; (2) the organosilicon film layer is compounded as follows: PDMS is added to a solvent, and cross-linking agent tetraethoxysilane and catalyst dibutyltin dilaurate are added, and stirred at 30 DEG C for 10-15min to dissolve until the mixture is viscous; and a casting solution is scraped on a the modified PU film prepared in the (1), statically placed at room temperature and dried. The modified polyurethane-organosilicon double layer pervaporation membrane has good separation performance for phenolic compounds in water. Both the permeation flux and the separation factor are improved, compared with that of unmodified PU film and a single layer PU membrane.

Description

technical field [0001] The invention relates to the technical field of pervaporation membrane separation, in particular to a pervaporation dephenolization membrane and its preparation method and application. Background technique [0002] Phenol is a toxic compound. Phenol-containing wastewater is one of the most harmful and widely polluting industrial wastewater in the world today, and is an important source of water pollution in the environment. But at the same time, phenol is an important chemical industrial product, and it is an important raw material or consumable for the fields of pesticides, plastics, and food processing. It is an important compound that is indispensable in industry. my country's demand and consumption of phenol are increasing year by year. Therefore, the effective removal or recycling of phenol has both environmental and economic significance. At present, there are many methods for treating phenolic wastewater, such as chemical oxidation, chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/54B01D67/00C02F1/44C02F101/34
Inventor 叶宏晏香宋伟伟赵子萱凌艳季也酩王澍
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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