ABSTRACT
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
History of Silica Sol Manufacturing Methods . . 48
Peptization Method . . . . . . . . . . . . . . . . . . . . . 48
Acid-Neutralization Method . . . . . . . . . . . . . . 48
Ion-Exchange Method . . . . . . . . . . . . . . . . . . . 49
Silica Sol Manufacturing Using
the Ion-Exchange Method . . . . . . . . . . . . . . . . . 49
Ion Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Particle Growth . . . . . . . . . . . . . . . . . . . . . . . . 50
Concentration . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Mechanism of Particle Growth . . . . . . . . . . . . . . 50
Variations of Silica Sol Manufacturing
Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Methods A-1 and A-2 . . . . . . . . . . . . . . . . . . . 51
Methods B-1 and B-2 . . . . . . . . . . . . . . . . . . . 52
Manufacturing of Large-Particle Silica Sols . . . . 52
Characteristics of Silica Sols Produced
by the Four Methods . . . . . . . . . . . . . . . . . . . . . 53
Manufacturing Methods of
Surface-Modified Silica Sols . . . . . . . . . . . . . . . . . 53
Silica Sols Stabilized with Ammonia, Amine,
and Quaternary Ammonium Hydroxide . . . . . . 54
Aluminum-Modified Silica Sol . . . . . . . . . . . . . . 54
Cation-Coated Silica Sol . . . . . . . . . . . . . . . . . . . 54
Lithium Silicate . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Future Trend in Silica Sol Manufacturing . . . . . . . 55
Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . . 56
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
The industrial development of silica sol manufacturing methods is reviewed. Primary attention is focused on
the preparation of monodispersed sols from water glass by the ion-exchange method. Details are given for
variations of manufacturing process and for the characteristics of both the processes and sols obtained.
