Hollow microsphere and its preparation method

A microsphere and hollow technology, applied in the field of hollow microspheres and their preparation, can solve the problems of cumbersome process, compound hollow microspheres have not yet been synthesized, and difficulty in industrialization

Inactive Publication Date: 2012-11-07
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The core-shell structure template method is a widely used method to prepare hollow spheres, but the bottleneck problems such as strict preparation conditions, cumbersome process, easy shell rupture when removing the template, and difficulty in industrialization have seriously affected the application of hollow spheres.
[0005] In indust

Method used

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  • Hollow microsphere and its preparation method
  • Hollow microsphere and its preparation method
  • Hollow microsphere and its preparation method

Examples

Experimental program
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Example Embodiment

[0049] Example 1. Utilization method one to prepare hollow microspheres

[0050] 1) 9.0g of inorganic precursor TEOS (tetraethylorthosilicate Si (OCH 2 CH 3 ) 4 ) And 3.0mL of 2mol / L hydrochloric acid dissolved in 87g of acetone, refluxed at 60℃ for 4h, then add 1g of ethyl 2-cyanoacrylate and mix uniformly to obtain a mixed solution; pump the obtained mixed solution with a peristaltic pump The air-flow spray drying equipment adopts the co-current drying method for drying. The atomization device of the spray dryer adopts a two-flow nozzle. The feed rate of the mixed liquid is 15mL / min; the nozzle gas flow is controlled by the pressure of the compressed air. 30L / h; control the feed temperature (that is, the air inlet temperature) to 25°C, and the outlet air is separated and vented by a vortex to obtain hollow microspheres a;

[0051] The SEM photo of the hollow microsphere a is as figure 2 Said. by figure 2 It can be seen that the prepared microspheres are hollow microspheres wit...

Example Embodiment

[0053] Example 2

[0054] According to the same experimental conditions and step 1) as in Example 1, only the acetone used in the soaking step in step 2) was replaced with hydrofluoric acid with a mass percentage concentration of 10%, and the hollow microspheres were removed after soaking with the hydrofluoric acid The silicon dioxide in a, the wall material provided by the present invention is polyethyl-2-cyanoacrylate hollow microspheres, the SEM picture is as Figure 4 Shown. by Figure 4 It can be seen that the particle size of the microspheres is 500nm-50μm. After the hydrofluoric acid treatment, the microspheres adhere to each other, and a small amount of the microspheres collapse or even break.

Example Embodiment

[0055] Example 3

[0056] According to exactly the same experimental conditions and step 1) as in Example 1, only after step 1) and before step 2), the obtained hollow microspheres a were heat-treated at 350° C. for 24 hours to obtain hollow microspheres b. After step 2) exactly the same as in Example 1, the wall material provided by the present invention is silica hollow microspheres. According to SEM observation, the particle size of the microspheres is 500nm-50μm, and the wall is 100nm- 1μm.

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Abstract

The invention discloses a hollow microsphere and its preparation method. In allusion to disadvantages of a traditional core-shell template method for preparation of a hollow microsphere, an alkene monomer with a rapid polymerization characteristic is fully utilized and a spray drying technology is combined in the invention. According to the preparation method, a layer of polymer shell is rapidly formed on the surface of a liquid drop, and by the utilization of a solvent for evaporation-induction, a shell formation substance grows on the interior surface of the polymer shell. Therefore, the hollow microsphere with a composite structure is prepared. Through adjusting experiment conditions and material components, the composition, structure and properties of the hollow microsphere are controllable. The method provided by the invention is a hollow microsphere preparation method with certain universality.

Description

technical field [0001] The invention relates to the field of material preparation, and relates to a class of hollow microspheres and a preparation method thereof. Background technique [0002] In recent years, due to the unique optical, electrical, mechanical, chemical and other properties brought about by changes in the size, composition, and structural order of materials, a large number of researches on materials with special functions have been carried out. [0003] Hollow sphere materials have attracted extensive attention of researchers due to their important theoretical and practical application values. The cavity inside the hollow sphere can be coated with a large number of guest molecules or nanoparticles, and can be used as a capsule material in the fields of medicine, cosmetics, fragrances, paints, inks, etc.; it can also be used as a confined reaction vessel, dye dispersant, lightweight filler , sound-absorbing materials, heat storage and flame-retardant material...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 杨振忠沈轲梁福鑫刘继广
Owner INST OF CHEM CHINESE ACAD OF SCI
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