US2020308010A1PendingUtilityA1

Method for manufacturing silica sol

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Assignee: FUJIMI INCPriority: Mar 28, 2019Filed: Mar 13, 2020Published: Oct 1, 2020
Est. expiryMar 28, 2039(~12.7 yrs left)· nominal 20-yr term from priority
Inventors:Masaaki ItoJun ShinodaKeiji Ashitaka
C01B 33/141C01B 33/14C01B 33/148C01B 33/145C01P 2004/64C01P 2006/22
53
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Claims

Abstract

A method for manufacturing a silica sol according to an embodiment of the present invention includes: a step of preparing a silica sol reaction liquid by hydrolyzing and polycondensing an alkoxysilane or a condensate thereof using an alkali catalyst in a solvent; and at least one of a step of concentrating the silica sol reaction liquid by an ultrasonic atomization separation method and a step of replacing the silica sol reaction liquid with water by the ultrasonic atomization separation method.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method for manufacturing a silica sol, comprising:
 preparing a silica sol reaction liquid by hydrolyzing and polycondensing an alkoxysilane or a condensate thereof using an alkali catalyst in a solvent; and   at least one of concentrating the silica sol reaction liquid by an ultrasonic atomization separation method and replacing the silica sol reaction liquid with water by the ultrasonic atomization separation method.   
     
     
         2 . The method for manufacturing a silica sol according to  claim 1 , wherein
 preparing the silica sol reaction liquid includes,   mixing a liquid (A) containing the alkali catalyst, water, and a first organic solvent with   a liquid (B) containing the alkoxysilane or a condensate thereof and a second organic solvent, and a liquid (C1) containing water and having a pH of 5.0 or more and less than 8.0.   
     
     
         3 . The method for manufacturing a silica sol according to  claim 1 , wherein
 preparing the silica sol reaction liquid includes,   mixing a liquid (A) containing the alkali catalyst, water, and a first organic solvent with   a liquid (B) containing the alkoxysilane or a condensate thereof and a second organic solvent, and a liquid (C2) containing water and no alkali catalyst.   
     
     
         4 . The method for manufacturing a silica sol according to  claim 1 , wherein the alkoxysilane is tetramethoxysilane. 
     
     
         5 . The method for manufacturing a silica sol according to  claim 1 , wherein the alkali catalyst is at least one of ammonia and an ammonium salt. 
     
     
         6 . The method for manufacturing a silica sol according to  claim 5 , wherein the alkali catalyst is ammonia. 
     
     
         7 . The method for manufacturing a silica sol according to  claim 2 , wherein the first and second organic solvents are methanol. 
     
     
         8 . The method for manufacturing a silica sol according to  claim 3 , wherein the first and second organic solvents are methanol.

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