Silica particle dispersion liquid and production method thereof

Patent metadata

Field	Value
Publication number	US-11542167-B2
Application number	US-202017029954-A
Country	US
Kind code	B2
Filing date	Sep 23, 2020
Priority date	Sep 30, 2019
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

Provided is a production method of a silica particle dispersion liquid which includes, preparing a linked silica particle by adding a liquid A containing alkoxysilane and a liquid B containing an alkali catalyst to a liquid containing water, an organic solvent, and an alkali catalyst in a container. The preparing a linked silica particle includes initially adding an alkali catalyst, the initially adding an alkali catalyst includes decreasing a molar ratio of an alkali catalyst to silica in the liquid in the container to 0.15 to 0.60 by adding the liquid A containing alkoxysilane to the liquid in the container, and increasing the molar ratio by 0.2 or more by adding the liquid B to the liquid having the decreased molar ratio in the container.

First claim

What is claimed is:

1. A production method of a silica particle dispersion liquid, comprising preparing a linked silica particle by adding a liquid A containing alkoxysilane and a liquid B containing an alkali catalyst to a liquid containing water, an organic solvent, and an alkali catalyst in a container, wherein
the preparing a linked silica particle includes initially adding an alkali catalyst,
the initially adding an alkali catalyst includes
decreasing a molar ratio of an alkali catalyst to silica in the liquid in the container to 0.15 to 0.60 by adding the liquid A containing alkoxysilane to the liquid in the container, and
increasing the molar ratio of an alkali catalyst to silica by 0.2 or more by adding the liquid B to the liquid having the decreased molar ratio in the container.

2. The production method of a silica particle dispersion liquid according to claim 1 ,
wherein an average particle diameter of a primary particle of silica in the container immediately before the addition of the liquid B in the initially adding an alkali catalyst is 5 to 200 nm.

3. The production method of a silica particle dispersion liquid according to claim 1 ,
wherein a silica concentration of the liquid in the container immediately before the addition of the liquid B in the initially adding an alkali catalyst is 0.5 to 10% by mass.

4. The production method of a silica particle dispersion liquid according to claim 1 , wherein
the preparing a linked silica particle further includes additionally adding an alkali catalyst after the initially adding an alkali catalyst, and
the additionally adding an alkali catalyst includes
decreasing a molar ratio of an alkali catalyst to silica in the liquid in the container to 0.10 to 0.55, and
increasing the molar ratio of an alkali catalyst to silica by 0.05 or more by adding the liquid B to the liquid having the decreased molar ratio in the container.

5. The production method of a silica particle dispersion liquid according to claim 4 ,
wherein the preparing a linked silica particle includes the additionally adding an alkali catalyst which is performed 1 to 4 times.

Assignees

• Jgc Catalysts & Chemicals Ltd

Inventors

• Hayashi Shogo
• Egami Miki
• Kumazawa Mitsuaki
• Muraguchi Ryo
• Komatsu Michio

Classifications

• C01B33/141 Primary

  Preparation of hydrosols or aqueous dispersions · CPC title

• C01B33/14 Primary

  Colloidal silica, e.g. dispersions, gels, sols · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• C01B33/145

  Preparation of hydroorganosols, organosols or dispersions in an organic medium · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title