Method for preparing regular-shaped silica airgel particles by high-energy cutting
An aerogel particle, high-energy cutting technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of low yield of target size particles, long reflux time, waste of raw materials, etc., to achieve high visible light transmittance, no The effect of powder contamination and product cost reduction
Active Publication Date: 2018-02-09
HUNAN SHANGYIFENG NEW MATERIAL TECH CO LTD
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Problems solved by technology
However, this method has the following problems: 1, the silica airgel particles obtained by this method are all irregular particles, the filling property is not good, and the texture is not uniform enough; 2, the target size particle yield of this method Low, the yield is lower than 50%, resulting in great waste of raw materials, pushing up product costs; 3, this method can not control the transmittance of visible light, can not adapt to various needs, is not conducive to post-processing; 4, this method The reflux time is long and the production efficiency is low, so industrialization is a problem; 5. This method adopts the traditional method of drying and then crushing. The size distribution of crushing is too wide and the size is different, which affects the yield of finished products, and a large amount of powder is produced during the crushing process. , large powder pollution
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Embodiment 1
[0040] Example 1: At 40°C, mix methyl orthosilicate, methanol, deionized water and dilute hydrochloric acid in a volume ratio of 1:0.5:0.1:0.0025, and stir for 0.1h to obtain a sol, and then press methyl orthosilicate The volume ratio of ester to ammonia water is 1:0.025, add ammonia water, stir and mix for 1 hour, let stand, after gelation, age the gel with ethanol at 40°C, replace ethanol once every 6 hours, replace 4 times, Then replace it with n-hexane for 4 times, each time for 6 hours, use normal pressure to dry to obtain silica airgel, and use high-energy cutting (choose one method from high-pressure water cutting, high-pressure gas cutting or ultrasonic cutting) to obtain the regular shape of the two Silica airgel particles.
[0041] Examples 2-20 were carried out in the same manner as in Example 1. Among them, in Examples 4, 11, 13, 19, and 20, before cutting to obtain regular-shaped silica airgel particles, supercritical drying is directly used to obtain silica airg...
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Abstract
The present invention relates to nano inorganic non-metallic materials, in particular to a method for preparing regular-shaped silica airgel particles by high-energy cutting. The method for preparing regular-shaped silica airgel particles by high-energy cutting of the present invention includes the following steps: (1) Dissolve organosilane, dilute hydrochloric acid, and deionized water in an organic solvent at 0-40°C, mix well, and react for 0.1-8 hours to obtain silica sol; (2) Add alkali and stir at 0-40°C, react for 0.01- After 1 hour, stand still; (3) wait for gelation; (4) dry to obtain airgel; (5) adopt high-energy cutting to obtain regular-shaped airgel particles. The method obtains regular-shaped silica airgel particles through high-energy cutting and molding. The obtained regular-shaped silica airgel particles are uniform in texture, high in visible light transmittance, and good in filling performance, which is very convenient for subsequent processing and greatly promotes Industrialization of silica aerogels.
Description
technical field [0001] The invention relates to the field of nano inorganic non-metallic materials, in particular to a method for preparing regular-shaped silica airgel particles by high-energy cutting. Background technique [0002] Airgel, English aerogel. When the gel removes most of the solvent, the liquid content in the gel is much less than the solid content, or the medium filled in the space network structure of the gel is gas, and the appearance is solid, that is, airgel, air condensation Glue usually aggregates nano-scale ultrafine particles to form a nano-porous network structure, and is a light-weight nano-solid material filled with a gaseous dispersion medium in the network pores. Airgel is sometimes called "solid smoke" or "frozen smoke" because of its translucent color and ultra-light weight. [0003] The most common and widely used aerogels are silica aerogels. Silica airgel is a lightweight nanoporous amorphous solid material with excellent thermal insulati...
Claims
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IPC IPC(8): C01B33/16
Inventor 卢孟磊左小荣卢勇
Owner HUNAN SHANGYIFENG NEW MATERIAL TECH CO LTD