Aqueous dispersion liquid and coating material, film, and product using the same
View Patent ↗In one embodiment, an aqueous dispersion liquid contains at least one particles selected from tungsten oxide particles and tungsten oxide composite particles. A mean primary particle diameter (D50) of the particles is in the range of 1 nm to 400 nm. In the aqueous dispersion liquid, concentration of the particles is in the range of 0.1 mass % to 40 mass %, and pH is in the range of 1.5 to 6.5. The aqueous dispersion liquid excels in dispersibility of particles and capable of maintaining good liquidity for a long period.
1. An aqueous dispersion liquid comprising particles selected from tungsten oxide particles and tungsten oxide composite particles and a dispersion medium including water,
wherein a mean primary particle diameter (D50) of the particles is in a range of 1 nm to 400 nm, a concentration of the particles in the aqueous dispersion liquid is in a range of 0.1 mass % to 40 mass %, and pH of the aqueous dispersion liquid is in a range of 1.5 to 6.5, and
wherein the tungsten oxide composite contains at least one metal element selected from transition metal elements and aluminum, or a compound including at least one metal element selected from transition metal elements and aluminum, in a range of 0.001 mass % to 50 mass % as an amount of the metal element, balanced by tungsten oxide.
2. The aqueous dispersion liquid according to claim 1 , wherein the concentration of the particles is in a range of 1.0 mass % to 20 mass %, and pH is in a range of 2.5 to 5.5.
3. The aqueous dispersion liquid according to claim 1 , wherein a BET specific surface area of the particles is in a range of 4.1 m 2 /g to 820 m 2 /g.
4. The aqueous dispersion liquid according to claim 1 , wherein a D90 diameter of a particle size distribution of the particles in the aqueous dispersion liquid is in a range of 0.01 μm to 10 μm.
5. The aqueous dispersion liquid according to claim 1 , wherein the metal element is at least one element selected from titanium, zirconium, manganese, iron, palladium, platinum, copper, silver, aluminum, and cerium.
6. The aqueous dispersion liquid according to claim 1 , wherein the dispersion medium further comprises alcohol in a range of 20 mass % or less.
7. A coating material comprising:
the aqueous dispersion liquid according to claim 1 ; and
at least one binder component selected from an inorganic binder and an organic binder.
8. The aqueous dispersion liquid according to claim 1 , wherein the tungsten oxide composite contains the metal element or the compound in a range of 0.01 mass % to 10 mass % as the amount of the metal element.
9. The aqueous dispersion liquid according to claim 1 , wherein the compound is an oxide of the metal element.