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Silica nanoporous membrane with graded porosity and preparation method thereof

A silica and nanoporous technology, applied in ceramic products, household appliances, other household appliances, etc., can solve the problem of poor wear resistance, unsatisfactory hydrophilicity, and difficulty in taking into account wear resistance and hydrophilicity at the same time. problem, to achieve the effect of low preparation cost and simple preparation method

Active Publication Date: 2020-09-18
上海西源新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this product has surface hydrophilic properties, it has disadvantages with its preparation method. First, the overall porosity of the product is single and constant from top to bottom, which results in that when the product porosity is small, The hydrophilicity is not ideal, and the wear resistance is not good when the porosity is large, that is, it is difficult to take into account both wear resistance and hydrophilicity; secondly, the preparation method cannot obtain both good wear resistance and good hydrophilicity. product of

Method used

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  • Silica nanoporous membrane with graded porosity and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The concrete steps of preparation are:

[0034] Step 1: According to the molar ratio of ethyl tetrasilicate, ethanol, nitric acid and water being 1:8:0.09:3, firstly mix and stir ethyl tetrasilicate and ethanol to obtain a mixed solution. Then nitric acid and water were mixed and stirred to obtain an aqueous solution of nitric acid.

[0035] In step 2, the nitric acid aqueous solution was first dropped into the mixed solution drop by drop, and stirred at 55° C. for 4 hours; wherein, the stirring speed was 750 r / min to obtain a silica sol. Then 1wt%, 3wt%, and 5wt% cetyltrimethylammonium bromide were added to 3 parts of silica sol respectively, stirred for 1 hour, aged for 4 days, and 3 parts of mixed sols were obtained.

[0036] Step 3, first place the substrate in the mixed sol containing cetyltrimethylammonium bromide gradually increasing for 3 times, and then dry it; wherein, the substrate is one of the insulators—— For glass slides, the descending speed of the sub...

Embodiment 2

[0038] The concrete steps of preparation are:

[0039] Step 1: According to the molar ratio of ethyl tetrasilicate, ethanol, nitric acid and water being 1:8.5:0.08:3.5, firstly mix and stir ethyl tetrasilicate and ethanol to obtain a mixed solution. Then nitric acid and water were mixed and stirred to obtain an aqueous solution of nitric acid.

[0040] In step 2, the nitric acid aqueous solution was first dropped into the mixed solution drop by drop, and stirred at 58° C. for 3.5 h; wherein, the stirring speed was 750 r / min to obtain a silica sol. Add cetyltrimethylammonium bromide with a mass fraction of 1wt%, 2wt%, 3wt%, and 5wt% to 4 parts of silica sol respectively, and after stirring for 1.3h, age for 4.5d to obtain 4 parts mixed sol.

[0041] Step 3, first place the substrate in the mixed sol containing cetyltrimethylammonium bromide gradually increasing, carry out 4 times of pulling coating, and then dry it; wherein, the substrate is one of the insulators—— For glass...

Embodiment 3

[0043] The concrete steps of preparation are:

[0044] Step 1: According to the molar ratio of ethyl tetrasilicate, ethanol, nitric acid and water being 1:9:0.07:4, firstly mix and stir ethyl tetrasilicate and ethanol to obtain a mixed solution. Then nitric acid and water were mixed and stirred to obtain an aqueous solution of nitric acid.

[0045] In step 2, the nitric acid aqueous solution was first dropped into the mixed solution drop by drop, and stirred at 60° C. for 3 hours; wherein, the stirring speed was 750 r / min to obtain a silica sol. Add cetyltrimethylammonium bromide with a mass fraction of 1wt%, 2wt%, 3wt%, 4wt% and 5wt% to 5 parts of silica sol respectively, and after stirring for 1.5h, age for 5d to obtain 5 parts mixed sol.

[0046]Step 3, first place the substrate in the mixed sol containing cetyltrimethylammonium bromide gradually increasing, carry out 5 times of pulling coating, and then dry it; wherein, the substrate is one of the insulators—— For glass...

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Abstract

The invention discloses a silicon dioxide nano porous membrane with gradient porosity and a preparation method of the silicon dioxide nano porous membrane. The nano porous membrane has the membrane thickness of 100-500 nm and consists of three or more layers of porous membranes with different spherical pore diameters, wherein the bottom pore diameter is 1-3 nm, the surface pore diameter is 5-8 nm,the pore edge space is 10-2 nm from bottom to top, and the porosity ranges from 30%-35% to 60%-70% from bottom to top. The method comprises the steps as follows: tetraethyl orthosilicate and ethanolare mixed, a mixed solution is obtained, a nitric acid aqueous solution is dropwise added to the mixed solution, silicon dioxide sol is obtained after stirring, cetyl trimethyl ammonium bromide is added, stirring is performed, mixed sol is obtained after aging, then, a substrate is sequentially placed in the mixed sol with gradually increased cetyl trimethyl ammonium bromide for pull coating 3 times or more, the obtained product is aired and annealed, and a target product is prepared. The silicon dioxide nano porous membrane has wear resistance and super-hydrophilic property and can be very easily and commercially applied to anti-fog, self-cleaning, wide spectrum anti-reflection fields and the like.

Description

technical field [0001] The invention relates to a nanoporous membrane and a preparation method thereof, in particular to a silicon dioxide nanoporous membrane with gradually changing porosity and a preparation method thereof. Background technique [0002] There is a strong attraction between the super-hydrophilic surface and water molecules, and water droplets can spread quickly on it, which is beneficial to take away surface pollutants and prevent droplets from condensing, thus having the functions of self-cleaning and anti-fog. Based on this mechanism, people have developed self-cleaning glass to be used in automotive rearview mirrors, windshields, glass curtain walls, solar glass panels and other occasions. In addition, the anti-fog function of the superhydrophilic surface also provides ideas for visualization in high-humidity environments. At present, in order to obtain super-hydrophilic materials, people have made some useful attempts and efforts, such as the title "Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/14C04B35/624
CPCC04B35/14C04B35/62222C04B35/624C04B38/0045C04B38/007C04B38/0074C04B38/0054
Inventor 许少辉费广涛王彪张敏倪志龙
Owner 上海西源新能源技术有限公司
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