Method for coating silicone rubber substrate
A method of coating a silicone rubber substrate, the method comprising (i) applying a coating composition comprising (a) about 50-80 wt % of a water-based silicone elastomer composition; (b) about 0.5-4.0 wt % of a silane adhesion promoter; (c) about 0.02-0.5 wt % of a silicone surfactant; and (d) about 10-50 wt % water to the silicone rubber substrate to form a coated substrate; and (ii) applying an acrylic material to the coated substrate.
1. A method of coating a silicone rubber substrate, the method comprising:
(i) applying a coating composition to the silicone rubber substrate to form a coated substrate, said coating composition comprising:
(a) about 50-80 wt% of a water-based silicone elastomer composition;
(b) about 0.5-4.0 wt% of a silane adhesion promoter;
(c) about 0.02-0.5 wt% of a silicone surfactant; and
(d) about 10-50 wt% water; and
(ii) applying an acrylic material to the coated substrate.
2. The method of claim 1 , wherein the water-based silicone elastomer composition comprises a crosslinked product of a hydroxy-terminated polydimethylsiloxane polymer with dimethyl methyl((diethylamino)oxy) siloxane.
3. The method of claim 1 , wherein the water-based silicone elastomer composition further comprises water, a cyclic siloxane, a non-ionic surfactant, calcium carbonate, titanium dioxide, and silicone dioxide.
4. The method of claim 1 , wherein the silicone surfactant is 2,6,8-trimethyl-4-nonyloxypolyethyleneoxyethanol.
5. The method of claim 1 , wherein the composition comprises the water-based silicone elastomer composition in an amount of 65-75 wt %.
6. The method of claim 1 , wherein the silane adhesion promoter is γ-glycidoxypropyltrimethoxysilane.
7. The method of claim 1 , wherein the composition comprises the silane adhesion promoter in an amount of 0.50-1.0 wt %.
8. The method of claim 1 , wherein the silicone surfactant is 3-(polyoxyethylene)propylheptamethyltrisiloxane.
9. The method of claim 1 , wherein the composition comprises the silicone surfactant in an amount of 0.020-0.050 wt %.
10. The method of claim 1 , further comprising a pH-adjuster, a filler, a pigment, or any combination thereof.
11. The method of claim 1 , wherein the coating composition is substantially free of acrylic materials.
12. The method of claim 1 , wherein the coating can adhere to a surface of a silicone rubber substrate.
13. The method of claim 1 , wherein the silicone rubber substrate is an exterior roof of a structure having a silicone rubber coating.
14. The method of claim 1 , comprising applying the coating composition to the silicone rubber substrate at a thickness of about 0.5 to 2.0 dry film mils.
15. The method of claim 1 , comprising applying the coating composition to the silicone rubber substrate at a thickness of about 0.8 to 1.5 dry film mils.