High performance silicon based coating compositions
A silicon based coating composition for a wide range of surfaces, which composition is formed from a mixture of constituents comprising appropriate portions of silazane, siloxane, and silane, and optionally organic solvent and additives, and the composition results in a coating having a thickness between 0.1 and 1.5 mil, a hardness of 2-9H and a standard coefficient of friction between about 0.03 to about 0.04.
1. A method of coating a surface, which method comprises:
a. mixing a mixture of constituents to form a silicon based coating composition comprising:
from about 5% (w/w of the total composition) to about 80% (w/w of the total composition) polysilazane,
from about 0% (w/w of the total composition) to about 60% (w/w of the total composition) polysiloxane, and
from about 8% (w/w of the total composition) to about 80% (w/w of the total composition) polysilane of a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and are chosen from alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl, which polysilane has a weight average molecular weight of more than 50,000;
b. coating the silicon based coating composition onto the surface; and
c. curing the coating ambiently to provide a non-ceramic clear coating;
wherein the cured coating has a thickness ranging between about 0.1 mil and about 1.5 mil, a hardness ranging between about 2H and about 9H in accordance with ASTM 3363 for film hardness by pencil test, and a kinetic coefficient of friction between about 0.03 and about 0.04.
2. The method of claim 1 , wherein the silicon based coating composition further comprises one or more organic solvents.
3. The method of claim 2 , wherein the organic solvent includes acetic esters selected from the group consisting of methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, ethylhexyl acetate, n-butyl acetate, tert-butyl acetate, amyl acetate, pentyl acetate, 2-methyl butyl acetate, and isoamyl acetate.
4. The method of claim 3 , wherein the organic solvent further includes hydrocarbons selected from the group consisting of hexane, heptane, benzene, toluene, and branched-chain alkanes (isoparaffins).
5. The method of claim 1 , wherein the silicon based coating composition further comprises one or more additives.
6. The method of claim 1 , wherein the silicon based coating composition further comprises a curing catalyst.
7. The method claim 1 , wherein the silicon based coating composition further comprises a curing hardener.
8. The method of claim 1 , wherein the polysilazane is in n-butyl acetate or tert-butyl acetate.
9. The method of claim 1 , wherein the silicon based coating composition comprises 5% (w/w of the total composition) to about 60% (w/w of the total composition) polysiloxane, wherein the polysiloxane comprises polydimethylsiloxane and is in isopropyl acetate.
10. The method of claim 1 , wherein the polysilane is in a mixture of pentyl acetate, 2-methyl butyl acetate, isoamyl acetate and isoparaffin.
11. The method of claim 1 , wherein the surface is made of material selected from the group consisting of glass, metal, paint, composite, gel coat, and any combinations thereof.
12. A silicon based coating composition formed from a mixture of constituents comprising:
from about 5% (w/w of the total composition) to about 80% (w/w of the total composition) polysilazane,
from about 0% (w/w of the total composition) to about 60% (w/w of the total composition) polysiloxane, and
from about 8% (w/w of the total composition) to about 80% (w/w of the total composition) polysilane of a formula (R 1 R 2 Si) n , wherein n is greater than 1, and wherein R 1 and R 2 are the same or different and are chosen from alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl, which polysilane has a weight average molecular weight of more than 50,000;
which composition after curing under ambient conditions is a non-ceramic clear coating having a thickness ranging between about 0.1 mil and about 1.5 mil, a hardness ranging between about 2H and about 9H in accordance with ASTM 3363 for film hardness by pencil test, and a kinetic coefficient of friction between about 0.03 and about 0.04.
13. The silicon based coating composition of claim 12 , wherein the polysilane has a weight average molecular weight of more than 100,000.
14. The silicon based coating composition of claim 12 , wherein the polysilazane is of a formula [H 2 Si—NH] n , and wherein the polysilazane is branched, linear or cyclic polymers, with n greater than 1.
15. The silicon based coating composition of claim 12 , wherein both R 1 and R 2 are alkyl.
16. The silicon based coating composition of claim 15 , wherein both R 1 and R 2 are methyl.
17. The silicon based coating composition of claim 12 , further comprising one or more organic solvents.
18. The silicon based coating composition of claim 17 , wherein the organic solvent includes acetic esters and selected from the group consisting of methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, ethylhexyl acetate, n-butyl acetate, tert-butyl acetate, amyl acetate, pentyl acetate, 2-methyl butyl acetate, and isoamyl acetate.
19. The silicon based coating composition of claim 18 , wherein the organic solvent further includes hydrocarbons selected from the group consisting of hexane, heptane, benzene, toluene, and branched-chain alkanes (isoparaffins).
20. The silicon based coating composition of claim 12 , further comprising one or more additives.
21. The silicon based coating composition of claim 12 , further comprising a curing catalyst.
22. The silicon based coating composition of claim 12 , further comprising a curing hardener.
23. The silicon based coating composition of claim 12 , wherein the polysilazane is in n-butyl acetate or tert-butyl acetate solvent.
24. The silicon based coating composition of claim 12 , wherein the polysilane is in a mixture of pentyl acetate, 2-methyl butyl acetate, isoamyl acetate and isoparaffin solvent.