Method for producing cation-modified silica and cation-modified silica dispersion liquid
OwnerYasunori OKADAinventor
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Abstract
The present invention provides a means for suppressing a change in zeta potential in cation-modified silica under acidic conditions. The present disclosure relates to a method for producing cation-modified silica, including a mixing step of adding a liquid B containing a silane coupling agent having a cationic group dropwise to a liquid A containing silica particles to prepare a mixed liquid C, wherein, in the mixing step, control is performed so that the mixed liquid C is maintained at a temperature of higher than 35° C. and 70° C. or lower.
Claims10
A method for producing cation-modified silica, comprising
- a mixing step of adding a liquid B containing a silane coupling agent having a cationic group dropwise to a liquid A containing silica particles to prepare a mixed liquid C,
- wherein, in the mixing step, control is performed so that the mixed liquid C is maintained at a temperature of higher than 35° C. and 70° C. or lower.
A cation-modified silica dispersion liquid, wherein a rate of reduction in zeta potential after 14 days in a dispersion liquid having a pH of 4 or less is less than 19%.
Dependencies are inferred from the claim text.