Hydrophobic hollow glass microsphere preparation method and prepared hydrophobic hollow glass microsphere thereof

Abstract

The invention relates to a method for preparing low-cost hydrophobic hollow glass microspheres by a spray drying method, wherein the method comprises the following steps: adding a mixed solution of boric acid, potassium hydroxide, lithium hydroxide and calcium hydroxide into a sodium silicate water glass solution in an atomizing way at high-speed agitation; and carrying out spraying drying and organic silicon surface modification on the mixed solution to obtain the hydrophobic hollow glass microspheres. The hollow glass microspheres have the characteristics of high yield, low cost and high stability.

Description

technical field [0001] The invention relates to a preparation technology of low-cost hydrophobic hollow glass microspheres. Specifically, sodium silicate water glass, boric acid, potassium hydroxide, lithium hydroxide, and calcium hydroxide are used as raw materials, and hollow glass microspheres are obtained by low-temperature spray drying. It is treated with hydrophobic surface to obtain high-quality products in one step and save energy consumption. technical background [0002] Hollow glass microsphere is a tiny hollow glass sphere, which is an inorganic non-metallic material. The chemical composition is silicon, boron, calcium, potassium, sodium, oxygen and so on. Typical particle size range 5-200 microns, bulk density 100-300kg / m 3 , has the advantages of light weight, low thermal conductivity, sound insulation, high dispersion, electrical insulation, and good thermal stability. It is a new type of lightweight material with a wide range of uses and excellent performa...

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Problems solved by technology

The hollow glass microspheres produced by American 3M Company and Porter Company can meet the requirements of high strength, high hollow rate and good stability, but it is difficult to promote because of the high cost of imported products

Patents CN1736912A and CN101152978A fail to solve the problems of improving the hollow rate and physical and chemical stability of hollow glass microspheres from the preparation process, and their sintering temperatures are all above 1000 ° C, wasting a lot of energy

Patent CN1990401A lowers the sintering temperature to 400~650°C, but the product is obtained through secondary sintering, which increases energy consumption and fails to solve the problem of surface modification

U.S. Patents 4,421,562, 4,340,642, and 4,411,847 use low-temperature spray-drying methods to manufacture hollow glass microspheres. The auxiliary material added is ammonium borate solution, and ammonia gas will be released during the spray-drying process, which will pollute the environment to a certain extent. In the process, the water on the surface of the hollow glass microspheres is removed by secondary drying, and the surface of the hollow glass microspheres is treated with aluminum sulfate and aluminum chloride. The process is cumbersome in actual operation.

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