Titanium compound sol solution, coating film using the same and manufacturing method thereof
The present invention provides a titanium compound sol solution capable of enabling manufacturing of a film high in transparency and having an excellent photocatalyst effect by low-temperature processing, and a coating film using the same. The present invention is a titanium compound sol solution containing a particulate incomplete condensate obtained by condensing an alkoxy titanium, an α-substituted β-diketone, and a solvent.
1. A titanium compound sol solution containing:
a particulate incomplete condensate obtained by condensing an alkoxy titanium;
an α-substituted β-diketone; and
a solvent,
wherein a condensation degree of the incomplete condensate is 30% to 60%,
wherein a difference (δ solvent -δ diketone ) between a solubility parameter δ solvent ) of the solvent and a solubility parameter (δ diketone ) of the α-substituted β-diketone calculated using an expression (1) is −2.0 to +2.0 (J/cm 3 ) 1/2 :
δ=(ΣΔ e i /ΣΔ v i ) 1/2 , expression (1)
where Δe i is an evaporation energy (J/mol) of each atomic group, and Δv i is a molar volume (cm 3 /mol) of each atomic group, and the evaporation energy and the molar volume of the atomic group are calculated by using a Fedors value, and
wherein an average particle diameter of the particulate incomplete condensate is 3 nm to 150 nm as measured by a dynamic light scattering method in a liquid.
2. The titanium compound sol solution according to claim 1 , wherein an alkoxy titanium content a [%] and an α-substituted β-diketone content b [%] satisfy relationships:
3.0≤ a≤ 33.0; and
a/b≥ 2.0.
3. The titanium compound sol solution according to claim 1 , wherein the solvent contains a solvent whose boiling point is 130° C. or higher by 80% or more for a total solvent amount.
4. The titanium compound sol solution according to claim 1 , wherein the solvent is at least one selected from the group consisting of 1-ethoxy-2-propanol, butyl carbitol, tripropylene glycol monomethyl ether, methyl carbitol, and butyl propionate.
5. An amorphous titanium oxide coating film formed by the titanium compound sol solution according to claim 1 .
6. A manufacturing method of an amorphous titanium oxide coating film, the method comprising:
a step of coating a base material with the titanium compound sol solution according to claim 1 ; and
a step of heating the base material at a temperature lower than or equal to a glass transition temperature of the base material after the coating.
7. The manufacturing method according to claim 6 , wherein the heating step is a step of heating the base material at 200° C. or lower.