Hollow inorganic particle and method for producing said hollow inorganic particle
Provided is a hollow inorganic particle having excellent strength despite having high porosity. Provided is a hollow inorganic particle including an outer shell, the thinnest part of the outer shell/the thickest part of the outer shell being 0.80 or more. The hollow inorganic particle according to the present technology can be produced by a production method including: a coating step of coating core particles made of an organic polymer with a silicone-based compound; and a core particle removal step of removing the core particles. The coating step includes: a dispersant addition step of adding a dispersant to a core particle dispersion; and, after the dispersant addition step, a surfactant addition step of adding a cationic surfactant.
1 . A method for producing hollow inorganic particles, comprising:
a coating step of coating core particles made of an organic polymer with a silicon-based compound; and
a core particle removal step of removing the core particles,
the coating step including:
a dispersant addition step of adding a nonionic surfactant as dispersant to a core particle dispersion; and,
after the dispersant addition step, a surfactant addition step of adding a cationic polymeric surfactant,
whereby the hollow inorganic particles thus produced have an average particle inner diameter/particle outer diameter of 0.55 to 0.93.
2 . The method for producing hollow inorganic particle according to claim 1 , wherein in the coating step, the core particle dispersion after the surfactant addition step has a cationic polymeric surfactant concentration of 0.05 to 5 g/L.
3 . The method for producing hollow inorganic particle according to claim 1 , wherein the dispersant is a hydrophilic polymer.