Aerogel particle and method of producing the same
View Patent ↗An aerogel particle is produced by following processes. A mixing process: an alkoxysilane compound is mixed with an organic solvent to form a first mixed solution. A hydrolysis process: an acid catalyst is added into the first mixed solution to perform a hydrolysis reaction, thereby obtaining a sol. A condensation process: an alkali catalyst is added into the sol to perform a condensation reaction, and a hydrophobic dispersion solvent is added and stirred during the condensation process, thereby subjecting sol to be gelled when it is stirred, further producing the aerogel particle with a uniform structure.
1. A method of producing a hydrophobic aerogel particle, comprising:
performing a mixing process, wherein an alkoxysilane compound is mixed with a solvent to form a first mixed solution; wherein the solvent includes a mixture of ethanol and water;
performing a hydrolysis process to the first mixed solution, wherein an acid catalyst is added into the first mixed solution to perform a hydrolysis reaction, thereby forming a sol;
performing a condensation process to the sol, wherein an alkali catalyst is added into the sol to perform a condensation reaction, and a hydrophobic dispersion solvent is added and stirred during the condensation process, thereby subjecting the sol to be gelled when it is stirred, further producing a second mixed solution including a gel particle, wherein the hydrophobic dispersion solvent is selected from a group consisting of ketone, ether, ester, aromatic and alkane; and
heating the second mixed solution to evaporate the solvent, and adding a chloryl organic molecule to subject the chloryl organic molecule to react with a hydroxyl group of the gel particle, wherein the gel particle becomes hydrophobic, and, further preventing the hydrophobic gel particle from being broken by the hydrophobic dispersion solvent; and
sequentially varying a temperature of the second mixed solution to a first temperature, a second temperature, and a third temperature, the first temperature being 78° C. to 82° C., the second temperature being 100° C. to 115° C., the third temperature being 40° C. to 45° C., and when the temperature of the second mixed solution is varied to the third temperature, the chloryl organic molecule is added; and
performing a post-treatment process including drying the hydrophobic gel particle in vacuum to obtain the hydrophobic aerogel particle.
2. The method of producing an aerogel particle of claim 1 , wherein a molar ratio of a mole of the alkali catalyst to a mole of the acid catalyst is 1.0:1.0 to 3.0:1.0.
3. The method of producing the aerogel particle of claim 1 , wherein the sol is stirred at 1200 rpm to 2000 rpm when the condensation process is performed.
4. The method of producing the aerogel particle of claim 1 , wherein the hydrophobic aerogel particle has a uniformly pearl-like structure or a uniformly ball-like structure.
5. The method of producing the aerogel particle of claim 1 , wherein the chloryl organic molecule is selected from a group consisting of chloryl alkoxysilane, chloryl alkane and chlorophene.
6. The method of producing the aerogel particle of claim 1 ,
wherein the post-treatment process further includes filtering the hydrophobic gel particle out by a filter and washing with toluene prior to the hydrophobic gel particle being dried in vacuum.
7. The method of producing the aerogel particle of claim 6 , wherein the sol is stirred at 1200 rpm to 2000 rpm when the condensation process is performed.
8. The method of producing the aerogel particle of claim 1 , wherein the hydrophobic aerogel particle is a core-shell particle.
9. The method of producing the aerogel particle of claim 8 , wherein the core-shell particle has a porous closed-shell.