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Method for preparing hollow spheres through microwave-assisted aerosol

A microwave-assisted, hollow sphere technology, which is applied in the preparation of microspheres and microcapsule preparations, can solve the problems of reduced specific surface area, small impurity content, and long aging time, and achieves low cost, short production cycle, and easy operation.

Inactive Publication Date: 2014-07-30
临泉县嘉鸿装饰工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN100348499C uses a spray drying method to prepare mesoporous hollow spherical titanium dioxide powder. In this method, titanium chloride is made into a hydrosol and spray-dried to obtain a hollow spherical powder composed of nano-titanium dioxide particles, which is then calcined to obtain a mesoporous hollow spherical powder. Although this preparation method does not need to add other reagents, the impurity content of the product is small, the purity is high, the yield is high, and the content of titanium atoms on the surface is high, and the photocatalytic performance is good, but the hydrosol needs to be aged during the preparation process, and the aging time is long , also need high temperature calcination
Although the process of this method is simple, the preparation time is short, and it is easy to scale up, it needs to be calcined at high temperature to remove CTAB and ammonium salts to obtain hollow mesoporous silica spheres, which will cause collapse or blockage of the hollow spheres, resulting in a decrease in porosity and a specific ratio. decrease in surface area

Method used

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  • Method for preparing hollow spheres through microwave-assisted aerosol
  • Method for preparing hollow spheres through microwave-assisted aerosol
  • Method for preparing hollow spheres through microwave-assisted aerosol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A. Weigh 3.0g of silica sol with a concentration of 40% and a particle size of 50nm, add 40.0g of pure water to dilute to a concentration of 2.8%, add 1.0g of ammonium bicarbonate, and mix well to obtain a precursor solution;

[0037] B. Put the above precursor solution into the aerosol generator, open the nitrogen cylinder, adjust the spray pressure of the aerosol generator to 18psi, and make aerosol droplets through atomization;

[0038] C. Introduce the aerosol droplets generated above into the microwave generator (microwave output power 700W, action time 17.5s), and then enter the tube furnace (set the temperature at 400°C) to dry for 5s, and the dried particles are passed through the filter The temperature of the filter is maintained at 80°C, and the collected product is a dry hollow spherical powder particle, and its particle size and shape are shown in the attached picture image 3 shown.

[0039] Depend on image 3 (a) It can be seen that after aerosol particl...

Embodiment 2

[0041] A. Weigh 5.0g of silica sol with a concentration of 30% and a particle size of 12nm, add 45.0g of pure water to dilute to a concentration of 3.0%, add 1.0g of ammonium bicarbonate, and mix well to obtain a precursor solution;

[0042] B. Put the above precursor solution into the aerosol generator, open the nitrogen cylinder, adjust the spray pressure of the aerosol generator to 10psi, and make aerosol droplets through atomization;

[0043] C. Pass the aerosol droplets generated above through a microwave generator (microwave output power 350W, action time 25s), and then enter the tube furnace (set the temperature at 400°C) to dry for 5s, and the dried particles are on the filter For collection, the temperature of the filter is maintained at 80°C, and the collected product is dry hollow spherical powder particles.

Embodiment 3

[0045] A. Weigh 3.0g of silica sol with a concentration of 40% and a particle size of 22nm, add 40.0g of pure water to dilute to a concentration of 2.8%, add 0.8g of ammonium bicarbonate, and mix well to obtain a precursor solution;

[0046] B. Put the above precursor solution into the aerosol generator, open the nitrogen cylinder, adjust the spray pressure of the aerosol generator to 10psi, and make aerosol droplets through atomization;

[0047] C. Pass the aerosol droplets generated above through a microwave generator (microwave output power 700W, action time 25s), and then enter the tube furnace (set the temperature at 400°C) to dry for 5s, and the dried particles are on the filter For collection, the temperature of the filter is maintained at 80°C, and the collected product is dry hollow spherical powder particles.

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Abstract

The present invention relates to the technical field of hollow sphere preparation, particularly to a method for preparing hollow spheres through a microwave-assisted aerosol. The method comprises: A, dispersing a hollow sphere shell precursor in a polar solvent, adding an ammonium salt to form a colloidal solution or true solution, ie., a precursor solution; B, carrying out atomization on the precursor solution prepared in the step A to form aerosol liquid droplets; and C, introducing the aerosol liquid droplets prepared in the step B into a microwave generator to carry out microwave irradiation to obtain the hollow sphere powder particles. According to the present invention, the hollow sphere powder preparation method has characteristics of short production period, simple operation, no pollution, easy scale-up and easy promotion application, wherein the microstructure of the prepared hollow sphere powder is not easily damaged.

Description

technical field [0001] The invention relates to the technical field of hollow sphere preparation, in particular to a method for preparing hollow spheres with microwave-assisted aerosol. Background technique [0002] Inorganic micro / nanomaterials with hollow sphere structure have attracted more and more attention because of their unique physical and chemical properties, and they have very broad application prospects in materials science and other disciplines. Inorganic micro / nano hollow sphere materials have the characteristics of light weight, high strength and high specific surface area, and they are widely used in many emerging fields. Carriers for media, biomedicine, slow-release and targeted release of drugs; they can also be used as high-efficiency catalysts and their carriers, light-wave and microwave-absorbing materials, photoelectric conversion materials, electrical insulation materials, low-dielectric insulation materials, etc. [0003] The preparation methods of i...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 黎珊闵建中姜兴茂
Owner 临泉县嘉鸿装饰工程有限公司
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