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 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 hydrolysis step of heating a solution that contains a Ti complex obtained by reacting a Ti-containing compound with a complexing agent (A), a Nb complex obtained by reacting a Nb-containing compound with a complexing agent (B), and water and uses a reductive compound as a solvent, so as to hydrolyze each complex; and a recovery step of recovering fine particles of an infrared-shielding material as a precipitate after the hydrolysis step. The hydrolysis step includes a gelation step of promoting the hydrolysis to gelate the solution and a solation step of promoting the hydrolysis of the gelated solution to solate.