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 sol solution containing:
a particulate incomplete condensate obtained by condensing an alkoxide;
an α-substituted β-diketone; and
a solvent,
wherein a condensation degree of the incomplete condensate is 30% to 60%, 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 sol solution according to claim 1 , wherein an alkoxide content a [%] and an α-substituted β-diketone content b [%] satisfy relationships:
3.0≤a≤33.0; and
a/b≥2.
3. The 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 sol solution according to claim 1 , wherein the solvent is at least one selected from the group consisting of 2-ethyl-1-butanol, 1-ethoxy-2-propanol, butyl carbitol, tripropylene glycol monomethyl ether, methyl carbitol, and butyl propionate.
5. A film formed by the sol solution according to claim 1 .
6. A product having a film formed by the sol solution according to claim 1 .
7. A manufacturing method of a film, the method comprising:
a step of coating a base material with the 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.
8. The manufacturing method of the film according to claim 7 , wherein the heating step is a step of heating the base material at 200° C. or lower.
9. The sol solution according to claim 1 , wherein the alkoxide is an alkoxy titanium.
10. The sol solution according to claim 1 , 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 /ΣΔv 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.