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Preparation method of composite membrane with hydrophobicity-hydrophilicity changed in gradient manner

A gradient change, composite membrane technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve problems such as single wettability, and achieve far-reaching application prospects and social benefits.

Active Publication Date: 2017-06-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using a single membrane material in a membrane module can only exhibit a single wettability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing a composite membrane with gradient changes in hydrophilicity and hydrophobicity, the steps are as follows:

[0024] Prepare silica sol by sol-gel method: prepare silica sol according to the molar ratio of ethyl orthosilicate: absolute ethanol: ammonia water = 1:50:2.7, first magnetically stir absolute alcohol and catalyst ammonia water until mixed uniform, and then quickly add tetraethyl orthosilicate to obtain silica sol.

[0025] Select the material and size of the base membrane: select the PP hollow fiber membrane with a length of 60mm as the base membrane, and ensure that the effective length after fixing is 50mm.

[0026] A composite membrane with a gradient change in hydrophilicity and hydrophobicity was prepared by the method of multiple positioning infiltration and pulling: pour the prepared silica sol into the material cup to ensure that the liquid level is greater than 50 mm; vertically fix the PP hollow fiber membrane on the pulling coa...

Embodiment 2

[0028] Prepare silica sol by sol-gel method: prepare silica sol according to the molar ratio of ethyl orthosilicate: absolute ethanol: ammonia water = 1:40:2.7, first magnetically stir absolute alcohol and catalyst ammonia water until mixed uniform, and then quickly add tetraethyl orthosilicate to obtain silica sol.

[0029] Select the material and size of the base film: choose a PP flat film with a length of 80mm and a width of 5mm as the base film to ensure that the effective length after fixing is 70mm.

[0030] A composite film with gradient changes in hydrophilicity and hydrophobicity is prepared by multiple positioning, infiltration and pulling methods: pour the prepared silica sol into the material cup to ensure that the liquid level is greater than 70mm; vertically fix the PP flat film on the pulling coating film Adjust the bottom edge of the basement film to coincide with the liquid surface in the sample tray of the machine, as the starting point of infiltration and p...

Embodiment 3

[0032] Titanium dioxide sol was prepared by sol-gel method: the titanium dioxide sol was prepared according to the molar ratio of tetrabutyl titanate: acetic acid: ethanol: water = 1:5.5:1.66:90. First, tetrabutyl titanate and ethanol are mixed and stirred at room temperature until uniform, and then slowly added to a mixed solution containing acetic acid and deionized water to obtain a titanium dioxide sol.

[0033] Select base membrane material and size: select PTFE hollow fiber membrane with a length of 60mm to ensure that the effective length after fixing is 50mm.

[0034] Composite membranes with gradient changes in hydrophilicity and hydrophobicity were prepared by multiple positioning, infiltration and pulling methods: pour the prepared titanium dioxide sol into the material cup to ensure that the liquid level is greater than 50mm; vertically fix the PTFE hollow fiber membrane on the pulling coating machine In the sample slot of the sample tray, adjust the bottom edge of...

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Abstract

The invention discloses a preparation method of a composite membrane with hydrophobicity-hydrophilicity changed in a gradient manner, and belongs to the field of membrane science and technology. The prepared composite membrane has a trend of gradient changed hydrophobicity-hydrophilicity within a certain length. The preparation method comprises the steps of 1, preparing silicon dioxide and titanium dioxide sol by using sol-gel method; 2, selecting material and size of the substrate membrane; and 3, preparing the composite membrane with hydrophobicity-hydrophilicity changed in the gradient manner by using a multi-positioning immersion method. According to the method, multi-positioning immersion is performed on the substrate membrane along a specified direction, and surface roughness of the substrate is changed by controlling a load density of nanoparticles on the surface of the substrate membrane, so that the prepared composite membrane has hydrophobicity-hydrophilicity changed in the gradient manner; the preparation method of the composite membrane is simple and low in cost; the composite membrane prepared according to the method is the novel composite membrane in the field of membrane science and technology.

Description

technical field [0001] The invention relates to a method for preparing a composite membrane with gradient changes in hydrophilicity and hydrophobicity, and belongs to the field of membrane science and technology. Background technique [0002] With the continuous development of membrane science and technology, people's research on the preparation methods of membrane materials has been deepened, and some membranes with excellent properties have been widely used in various industrial production processes. At present, common membrane materials can be divided into superhydrophilic membranes (water contact angle<5°), hydrophilic membranes (water contact angle<90°), hydrophobic membranes (water contact angle>90°) according to surface wettability. °), superhydrophobic film (water contact angle>150°). According to different separation requirements, the specified hydrophilic or hydrophobic membrane materials can be selected. However, using a single membrane material in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D71/26B01D69/12B01D67/00
CPCB01D67/0027B01D69/12B01D71/26B01D71/36B01D2325/36B01D2325/38
Inventor 姜晓滨贺高红王樱淇李祥村肖武吴雪梅
Owner DALIAN UNIV OF TECH
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