Methods of preparing self-decontaminating surfaces using quaternary silanes and titanium anatase sol
A method to prepare a self-decontaminating surface, where that method includes disposing a first coating on a surface, where that first coating comprises an organosilane, and disposing a second coating over the first coating, where the second coating comprises TiO 2 .
1. A method of preparing a self-decontaminating surface on a substrate, said method comprising:
(1) disposing onto a substrate an aqueous mixture of an organosilane of structure (5),
wherein R 3 is alkyl; R 5 is selected from the group consisting of alkyl and oxyalkyl; R 6 , R 7 , and R 8 are selected from the group consisting of alkyl, alkenyl, phenyl, and benzyl; and X − is selected from the group consisting of chlorine, bromine, and iodine; and
(2) casting a liquid coating composition comprising titanium (IV) isopropoxide over said organosilane to produce said self-decontaminating surface.
2. The method of claim 1 , wherein said organosilane is an organosilane of structure (1),
wherein R 1 and R 2 are alkyl, and X − is selected from the group consisting of chlorine, bromine, and iodine.
3. The method of claim 1 , wherein said aqueous mixture comprises 3.6 weight percent of said organosilane (5).
4. The method of claim 1 , wherein said organosilane is an organosilane of structure (14),
wherein R is selected from the group consisting of methyl and ethyl; X − is selected from the group consisting of chlorine, bromine, and iodine; and p is from 1 to 5.
5. The method of claim 1 , wherein R 8 comprises a C 18 alkyl chain.
6. The method of claim 1 , wherein casting the liquid coating composition follows disposing the organosilane by about 15 minutes.
7. The method of claim 1 , wherein said substrate is Formica.
8. The method of claim 1 , wherein the substrate comprises a surface within a mass transportation vehicle.
9. The method of claim 1 , wherein said self-decontaminating surface comprises a linear polymer having the structure (3),
10. The method claim 1 , wherein said self-decontaminating surface comprises a cross-linked polymer having the structure (4a),