Preparation method and application of organosilicone sol based on pH swing

A technology of organosilicon sol, organosilicon source, applied in chemical instruments and methods, membrane, semipermeable membrane separation, etc., can solve problems such as poor high temperature resistance, achieve narrow particle size distribution, inhibit hydrolysis and rearrangement effect

Active Publication Date: 2016-05-25
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantage of poor high temperature resistance of the traditional polyamide reverse osmosis membrane, the present invention proposes a method for preparing a high temperature resistant reverse osmosis membrane under the premise of ensuring the salt rejection rate and water flux of the membrane during the reverse osmosis process

Method used

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  • Preparation method and application of organosilicone sol based on pH swing
  • Preparation method and application of organosilicone sol based on pH swing
  • Preparation method and application of organosilicone sol based on pH swing

Examples

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Effect test

Embodiment 1

[0021] 1. Dissolve 1g of BTESE in 15.59g of absolute ethanol (EtOH) solution, stir in a water bath at 40°C for 5min, and rotate at 500rpm; add 3.05g of deionized water (H 2 O), continue stirring in a water bath at 40°C for 5min, with a rotating speed of 500rpm; BTESE: EtOH: H 2 O=1:120:60 (molar ratio);

[0022] 2. Add concentrated hydrochloric acid with a solute mass fraction of 37% to the above mixed solution, adjust the pH of the mixed solution to 0.8, and continuously stir and react for 1 hour at 40° C. in a water bath at a speed of 500 rpm;

[0023] 3. Slowly add ammonia water to the mixed solution, adjust the pH of the mixed solution to 6.5, react in a water bath at 40°C for 1 hour, and rotate at 500 rpm to prepare a bridged silicone sol;

[0024] 4. Coat the prepared sol with α-Al 2 o 3 The material is calcined at 200° C. to form a film (the thickness of the film is 60 nm) on a supporting film and applied to reverse osmosis desalination.

Embodiment 2

[0026] 1. Dissolve 1g of ETMS in 36.79g of EtOH, stir in a water bath at 40°C for 5min, and rotate at 500rpm; add 7.2g of deionized water (H 2 O), continue to stir in a water bath at 40°C for 5min at a speed of 500rpm; ETMS: EtOH: H 2 O=1:120:60 (molar ratio);

[0027] 2. Add concentrated hydrochloric acid with a solute mass fraction of 37% to the above mixed solution, adjust the pH of the mixed solution to 0.8, and continuously stir and react for 1 hour at 40° C. in a water bath at a speed of 500 rpm;

[0028] 3. Slowly add ammonia water to the mixed solution, adjust the pH of the mixed solution to 7, react in a water bath at 40°C for 1 hour, and rotate at a speed of 500 rpm to prepare a side chain organosilicon sol;

[0029] 4. Coat the prepared sol with α-Al 2 o 3 The material is calcined at 200° C. to form a film (the thickness of the film is 60 nm) on a supporting film and applied to reverse osmosis desalination.

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Abstract

The invention belongs to the field of preparation of inorganic membrane materials, in particular to a preparation method and application of an organosilicone sol based on pH swing. The preparation method comprises the following steps of adding an organosilicone source precursor into absolute ethyl alcohol; after stirring in water bath, adding deionized water; on the premise of continuous stirring in the water bath, adjusting the pH of the system to acidity by using acid and reacting for one hour; adjusting the pH of the system to weak acidity or neutrality, and reacting for one hour to prepare the organosilicone sol of which particle size distribution is extremely-narrow and stable; gelatinizing the sol into a membrane for reverse osmosis desalination. The organosilicone reverse osmosis membrane shows excellent hydrothermal stability and salt rejection rate.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic membrane materials, in particular to a preparation method and application of organic silicon sol based on pH swing. Background technique [0002] With the increasingly serious problem of water resources, desalination of seawater and brackish water or treatment of industrial wastewater through reverse osmosis technology has become an effective way to obtain fresh water. The selection of reverse osmosis membrane material is the most critical step in reverse osmosis technology. The commercial polyamide membrane supported by polysulfone ultrafiltration membrane is the current mainstream reverse osmosis membrane. However, most of these membrane materials can only be used below 50°C, which greatly limits the application of reverse osmosis membrane materials in the industry. fields of application in production. [0003] For example, in the textile industry, the outlet temperature of bleaching an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D69/12
CPCB01D67/0079B01D67/0083B01D69/12B01D71/025B01D71/027B01D2323/48B01D2325/30B01D2325/32
Inventor 徐荣郭猛钟璟张琪
Owner CHANGZHOU UNIV
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