Method for producing infrared shielding material fine particle, method for producing infrared shielding material fine particle dispersion, infrared shielding material fine particle, infrared shielding material fine particle powder, infrared shielding material fine particle dispersion, infrared shielding material fine particle dispersion and coated base material

摘要

PROBLEM TO BE SOLVED: To provide a method for achieving a good recovery rate and good workability in producing fine particles of an infrared-shielding material which are titanium oxide fine particles doped with Nb and sufficiently exhibit a function as an infrared-shielding material.SOLUTION: The method includes a hydrothermal synthesis step of subjecting an aqueous solution that contains a Ti complex obtained by reacting a Ti-containing compound with a complexing agent (A) and a Nb complex obtained by reacting a Nb-containing compound with a complexing agent (B) to hydrothermal synthesis to hydrolyze each complex; and a recovery step of recovering fine particles of an infrared-shielding material as a precipitate after the hydrothermal synthesis step. The hydrothermal synthesis step includes a gelation step of promoting the hydrolysis to gelate the aqueous solution and a solation step of promoting the hydrolysis of the gelated aqueous solution to solate.