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Preparation method for mesoporous compound film

A composite membrane and mesoporous technology, applied in the field of materials, can solve the problems that silicon oxide is easy to fall off and cannot be applied, and achieves the effect of simple preparation process and environmental friendliness

Active Publication Date: 2017-05-31
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has certain requirements for the selection of the matrix membrane material. For example, when compounding a polymer porous membrane with poor water wettability, mesoporous silica cannot form a stable interface with the polymer, and silicon oxide and polymer There are obvious gaps between them, and the silicon oxide is easy to fall off under the action of external force, so this method cannot be applied to the preparation of common polymer porous membrane-based composite membranes.

Method used

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  • Preparation method for mesoporous compound film
  • Preparation method for mesoporous compound film
  • Preparation method for mesoporous compound film

Examples

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preparation example Construction

[0030] The embodiment of the present invention discloses a method for preparing a mesoporous composite membrane, which includes the following steps: under the action of a catalyst, carry out an alcoholysis reaction of a precursor compound and a structure-directing agent in ethanol to obtain a sol, and the precursor compound is selected from From one or more of silicon source compounds, titanium source compounds, zinc source compounds, tin source compounds and niobium source compounds, the structure directing agent is selected from polyethylene oxide-polypropylene oxide-polyethylene oxide One or more of alkane triblock copolymer, cetyltrimethylammonium bromide and sodium lauryl sulfate; the porous membrane is surface treated, and then soaked in the sol for 2 to 24 hours ; Dry the soaked porous membrane at room temperature and complete the sol-gel process, then wash and dry to obtain the mesoporous composite membrane.

[0031] In the sol preparation step, the catalyst is prefera...

Embodiment 1

[0044] Soak a uniaxially stretched PP porous membrane with a thickness of 25 μm (pore size about 40nm×200nm) in a large amount of absolute ethanol and ultrasonically clean it for 0.5h, and dry it to prevent dust; place the cleaned and dried porous PP membrane in a plasma Processed in the body apparatus for 20s, then sealed in a ziplock bag. Dissolve 2.0g of F127 in 6.0g of ethanol, add 1.5g of 0.2mol L~1 hydrochloric acid solution while stirring, add 6.0g of TEOS into the mixture, and stir at room temperature for 2h to obtain a colorless and transparent silica sol . The treated PP porous membrane was immersed in the sol for 24 h until the membrane was completely permeated and became transparent. Take out the sol-soaked film, and let it dry naturally in the air for 48 hours at a relative humidity of 60-80%, so that the sol-gel process of silica can fully proceed, and carefully remove the remaining silica on the surface of the completely dried film. peeling off, and finally wa...

Embodiment 2

[0047] Soak a uniaxially stretched PP porous membrane with a thickness of 25 μm (pore size about 40nm×200nm) in a large amount of absolute ethanol and ultrasonically clean it for 0.5h, and dry it to prevent dust; take 50mL of 0.1M Tris(Hydroxymethyl)aminomethane solution , add 14.7mL of 0.1M HCl, adjust the pH value to 8.5, dilute to 100mL, and obtain 0.05M Tris·HCl buffer solution. Take 50 mL of 0.05M Tris·HCl buffer and dilute to 250 mL to obtain 0.01M buffer. Dissolve 0.5g Dopamine in 250mL 0.01M Tris HCl buffer solution, then soak the ethanol-soaked PP membrane in the mixed solution, ultrasonically treat it for 0.5h, let it stand for 12h, and finally take out the PP membrane and wash it with a large amount of deionized water and Wash and dry with absolute ethanol; dissolve 2.0g F127 in 6.0g ethanol, add 1.5g of 0.2mol L~1 hydrochloric acid solution while stirring, add 6.0g TEOS to the mixture, stir at room temperature for 2h, and obtain transparent silica sol. The untrea...

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Abstract

The invention provides a preparation method for a mesoporous compound film. The method comprises the following steps: triggering the alcoholysis reaction of a precursor compound and a structure-directing agent in ethyl alcohol, thereby obtaining a sol; performing surface treatment on a porous film and soaking in the sol; airing the soaked porous film under a room temperature condition and completing a sol-gelling process; cleaning and drying, thereby obtaining the mesoporous compound film. According to the invention, a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, cetyl trimethyl ammonium bromide or lauryl sodium sulfate is taken as the structure-directing agent, so that the mesoporous size of the prepared mesoporous compound film can be continuously adjusted. The mesoporous compound film prepared according to the invention has a unique mesoporous structure; due to the organic solvent resistance and special porous structure or the capability of further modifying the mesoporous of the compound film, the mesoporous compound film can be applied to the separating purification fields of selective molecule transferring in the solution, the size selective ion transferring and ultrafiltration on a separating and liquid / liquid interface, and the like; the preparation process is simple; the method is environment-friendly.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a preparation method of a mesoporous composite membrane. Background technique [0002] Flexible polymer porous membranes with various compositions and structures have been developed for decades, and the molding and processing technology has been quite mature. For example, polypropylene porous membrane is made by stretching a polypropylene membrane with rubber-like elasticity to a certain extent and then heat-setting, which has many applications. Since the membrane is porous, the specific surface area is greatly increased, and it can provide an internal surface area for interactions up to 20m 2 / g. It can also be cleverly connected with various functional groups according to the needs of the design goals, changing the hydrophobicity of the original polymer to hydrophilicity, and matching with the filter matter in terms of coordination, affinity and chelation. The reversible p...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D71/26B01D71/48B01D71/64B01J20/26B01J20/28B01J20/30
CPCB01D67/0079B01D69/12B01D71/26B01D71/48B01D71/64B01J20/103B01J20/261B01J20/262B01J20/28033B01J20/28083B01J2220/46B01J2220/4806B01J2220/4812
Inventor 程文广陈勇陈良
Owner SHENZHEN SENIOR TECH MATERIAL
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