Surface-treated infrared-absorbing fine particles, surface-treated infrared-absorbing fine particle powder, infrared-absorbing fine particle dispersion liquid in which the surface-treated infrared-absorbing fine particles are used, infrared-absorbing fine particle dispersion, and infrared-absorbing substrate
Provided are surface-treated infrared-absorbing fine particles that are infrared-absorbing fine particles each having a crystallite size greater than or equal to 30 nm and a surface that is coated with a coating layer that contains at least one selected from a hydrolysis product of a metal chelate compound, a polymer of the hydrolysis product of the metal chelate compound, a hydrolysis product of a metal cyclic oligomer compound, and a polymer of the hydrolysis product of the metal cyclic oligomer compound.
1 . Surface-treated infrared-absorbing fine particles each comprising:
an infrared-absorbing fine particle having a crystallite size of 42 nm or more and 60 nm or less; and
a coating layer coated on a surface of the infrared-absorbing fine particle, the coating layer containing:
a hydrolysis product of a metal chelate compound, or
a hydrolysis product of a metal cyclic oligomer compound, wherein
the metal chelate compound or the metal cyclic oligomer compound contains Al,
the metal chelate compound or the metal cyclic oligomer compound has at least one selected from the group consisting of an ether bond, an ester bond, and an acetyl group, and
the infrared-absorbing fine particles are represented by a formula MxWyOz, where M is at least one element selected from the group consisting of Cs, K, Rb, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn, W is tungsten, O is oxygen, satisfying 0.2≤x/y≤0.5 and 2.0≤z/y≤3.0.
2 . A surface-treated infrared-absorbing fine particle powder containing the surface-treated infrared-absorbing fine particles according to claim 1 .
3 . The surface-treated infrared-absorbing fine particles according to claim 1 , wherein the metal chelate compound and the metal cyclic oligomer compound are metal acetylacetonate or metal carboxylate.
4 . The surface-treated infrared-absorbing fine particles according to claim 1 , wherein the metal chelate compound and the metal cyclic oligomer compound are not metal alkoxide.
5 . The surface-treated infrared-absorbing fine particle powder according to claim 2 , wherein a carbon concentration in the surface-treated infrared-absorbing fine particle powder is 0.2 mass % or more and 5.0 mass % or less, the carbon concentration being based on an amount of residual carbon present in the coating layer.
6 . The surface-treated infrared-absorbing fine particles according to claim 1 , wherein the coating layer further contains a polymer of the hydrolysis product of the metal chelate compound or a polymer of the hydrolysis product of the metal cyclic oligomer compound.
7 . The surface-treated infrared-absorbing fine particles according to claim 1 , wherein the coating layer is not subjected to heat treatment to increase density or chemical stability thereof.
8 . An infrared-absorbing fine particle dispersion liquid in which the surface-treated infrared-absorbing fine particles according to claim 1 are dispersed in a predetermined liquid medium.
9 . The infrared-absorbing fine particle dispersion liquid according to claim 8 ,
wherein the liquid medium is at least one liquid medium selected from the group consisting of an organic solvent, fat, oil, a liquid plasticizer, a compound polymerized by curing, and water.
10 . An infrared-absorbing fine particle dispersion that is a dry solidified product of the infrared-absorbing fine particle dispersion liquid according to claim 8 .
11 . An infrared-absorbing fine particle dispersion in which the surface-treated infrared-absorbing fine particles according to claim 1 are dispersed in a predetermined solid-state resin.
12 . The infrared-absorbing fine particle dispersion according to claim 11 ,
wherein the solid-state resin is at least one resin selected from the group consisting of fluorocarbon resin, PET resin, acrylic resin, polyamide resin, vinyl chloride resin, polycarbonate resin, olefin resin, epoxy resin, and polyimide resin.
13 . An infrared-absorbing substrate comprising a coating layer that is formed on at least one surface of at least one substrate,
wherein the coating layer contains the surface-treated infrared-absorbing fine particles according to claim 1 .
14 . The infrared-absorbing substrate according to claim 13 ,
wherein the coating layer further contains a glass coating agent.
15 . The infrared-absorbing substrate according to claim 14 ,
wherein the glass coating agent is at least one selected from the group consisting of a silane coupling agent, a silane-based alkoxide, a polysilazane, and a polyorganosilane.
16 . The infrared-absorbing substrate according to claim 13 ,
wherein the substrate is at least one selected from the group consisting of a glass substrate and a resin substrate.