Method for preparing regularly-shaped silicon dioxide aerogel particles in high-energy cutting manner
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, waste of raw materials, long reflux time, etc., achieve high visible light transmittance, reduce product Cost, no powder contamination effect
Inactive Publication Date: 2015-12-30
HUNAN SHANGYIFENG NEW MATERIAL TECH CO LTD
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Problems solved by technology
But, this method has the following problems: 1, the silicon dioxide airgel particles obtained by this method are all irregular particles, the filling property is not good, and the texture is not uniform enough simultaneously; 2, the target size particle yield of this method is relatively low. Low, the yield is lower than 50%, thereby causing great waste of raw materials, pushing up the product cost; 3, this method can not control the light transmittance, can not adapt to various needs, is not conducive to post-processing; 4, the reflux time of this method is relatively long Long, low production efficiency, so industrialization is a problem; 5. This method adopts the traditional method of drying and then crushing. The distribution of crushed sizes 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, so the powder Big pollution
Method used
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Embodiment 1
[0035] 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, use high-energy cutting (choose one from high-pressure water cutting, high-pressure gas cutting or ultrasonic cutting) to get the regular The shape of the silica gel particles, aging the gel particles with ethanol at 40°C, replacing the ethanol every 6h for 4 times, and then replacing it with n-hexane for 4 times, each time for 6h, drying at normal pressure Silica airgel particles with regular shapes can be obtained.
[0036] Examples 2-20 were carried out in the same manner as in Example 1. Among them, in Examples 4, 11, 13, 19, and 20, after obtaining regular-shaped silica gel particles through the previous high-energy cutting step, dir...
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Abstract
The invention relates to a nano inorganic nonmetal material, particularly to a method for preparing regularly-shaped silicon dioxide aerogel particles in a high-energy cutting manner. The method comprises the following steps: (1) dissolving organic silane, dilute hydrochloric acid and deionized water in organic solvent, wherein the volume ratio of the organic silane, dilute hydrochloric acid, deionized water and organic solvent is 1: (0.0025 to 0.5): (0.05 to 5): (0.5 to 8), uniformly mixing, and reacting for 0.1 to 8 hours to obtain silica sol; (2) adding alkali at the temperature of 0 to 40 DEG C, stirring, reacting for 0.01 to 1 hour, and standing; (3) forming gel, and then obtaining regularly-shaped gel particles in a high-energy cutting manner; (4) drying to obtain the regularly-shaped silicon dioxide aerogel particles.
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 heat resistance ...
Claims
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Login to View More IPC IPC(8): C01B33/16
Inventor 卢孟磊左小荣卢勇
Owner HUNAN SHANGYIFENG NEW MATERIAL TECH CO LTD