Durable hydrophobic surface coatings using silicone resins
A hydrophobic coating including solid silsesquioxane silicone resins to increase durability is provided. The hydrophobic coating is any composition that increases the contact angle to a surface, preferably glass. The durability of the hydrophobic coating is preferably increased to one and a half years, more preferably three years.
1. A durable water repellent composition for surfaces comprising: a curing agent, zirconium propoxide, a poly-silicate, and an MQ silicone resin, wherein the curing agent and the silicone resin are at least in part crosslinked, and wherein the curing agent comprises a poly-siloxane modified with a cyanoalkyl or carbinol group.
2. The composition of claim 1 wherein the composition includes tetra-ethylorthosilicate.
3. The composition of claim 1 wherein the composition includes 3-amino-propyltrimethoxysilane.
4. The composition of claim 1 wherein the amount of silicone resin in the range of from about 0.1 to about 5 wt. %.
5. The composition of claim 1 wherein the curing agent is a C 16 -C 18 alkoxysilane.
6. The composition of claim 1 wherein the silicone resin has a cubic structure.
7. The composition of claim 1 wherein the silicone resin further includes an MQ resin.
8. The composition of claim 1 wherein the silicone resin has a molecular weight in the range of about 5,000 to about 15,000.
9. The composition of claim 1 further comprising a solvent.
10. The composition of claim 1 further comprising a catalyst.
11. The composition of claim 1 further comprising one or more additives.
12. The composition of claim 1 further comprising a solvent, a catalyst and one or more additives.
13. An article comprising a glass substrate of which at least a portion of the substrate is treated with a durable water repellant composition comprising: a curing agent;, zirconium propoxide, a poly-silicate, and an MQ silicone resin, and a silsesquioxane silicone resin; wherein said curing agent and silicone resin are at least in part crosslinked; and wherein the curing agent comprises a poly-siloxane modified with a cyanoalkyl or carbinol group.
14. The article of claim 13 further comprising a primer layer.
15. The article of claim 13 further comprising a topcoat layer.
16. An article comprising a glass substrate of which at least a portion of the substrate is treated with the composition of claim 2 .
17. The article of claim 16 further comprising a primer layer.
18. The article of claim 16 further comprising a topcoat layer.
19. An article comprising a glass substrate of which at least a portion of the substrate is treated with the composition of claim 3 .
20. The article of claim 19 further comprising a primer layer.
21. The article of claim 19 further comprising a topcoat layer.
22. An article comprising a glass substrate of which at least a portion of the substrate is treated with the composition of claim 4 .
23. The article of claim 22 further comprising a primer layer.
24. The article of claim 22 further comprising a topcoat layer.
25. An article comprising a glass substrate of which at least a portion of the substrate is treated with the composition of claim 5 .
26. The article of claim 25 further comprising a primer layer.
27. The article of claim 25 further comprising a topcoat layer.
28. An article comprising a glass substrate of which at least a portion of the substrate is treated with the composition of claim 6 .
29. The article of claim 28 further comprising a primer layer.
30. The article of claim 28 further comprising a topcoat layer.
31. An article comprising a glass substrate of which at least a portion of the substrate is treated with the composition of claim 7 .
32. The article of claim 31 further comprising a primer layer.
33. The article of claim 31 further comprising a topcoat layer.
34. An article comprising a glass substrate of which at least a portion of the substrate is treated with the composition of claim 8 .
35. The article of claim 34 further comprising a primer layer.
36. The article of claim 34 further comprising a topcoat layer.
37. A method of making a hydrophobic surface comprising applying the water repellant composition of claim 1 to the surface of a substrate.
38. The method of claim 37 wherein applying the water repellant composition comprises using a sponge or the like.
39. The method of claim 37 wherein applying the water repellant composition comprises spraying the surface with the composition and then spreading the composition with a sponge or a cloth.
40. The method of claim 37 wherein the amount of silicone resin in the range of from about 0.1 to about 5 wt. %.
41. The method of claim 37 wherein the surface is glass, silica, alumina, or surfaces with a high oxygen content.
42. The method of claim 37 wherein the surface is an aircraft windshield.
43. The method of claim 37 wherein the curing agent is a C 16 -C 18 alkoxysilane.
44. The method of claim 37 wherein the silicone resin has a cubic structure.
45. The method of claim 37 wherein the silicone resin is an MQ resin.
46. The method of claim 37 wherein the silicone resin has a molecular weight in the range of about 5,000 to about 15,000.
47. The method of claim 37 wherein the water repellant composition further comprises a solvent.
48. The method of claim 37 wherein the water repellant composition further comprises a catalyst.
49. The method of claim 37 wherein the water repellant composition further comprises one or more additives.
50. The composition of claim 37 wherein the water repellant composition further comprises a solvent, a catalyst and one or more additives.
51. The method of claim 37 wherein the water repellant composition further comprises crosslinking the curing agent.