Curable polysiloxane compositions and slippery materials and coatings and articles made therefrom
The present teachings generally provide curable polysiloxane compositions including a base resin including a MQ vinyl siloxane. Articles of manufacture including the curable polysiloxane compositions and slippery coatings and materials also are provided. The compositions may be used to provide slippery, lubricious, or repellent materials and coatings and may provide anti-fouling function. The compositions can provide anti-fouling or foul-release function on open surfaces, internal surfaces, membranes; to provide pinning free or low contact angle hysteresis surfaces; to provide homogeneous interface to suppress nucleation; to provide a barrier layer such as anti-corrosion; to provide anti-stain, anti-smudge, anti-fingerprint, anti-soil function.
1. A curable polysiloxane composition capable of curing to form a slippery coating on a surface, the curable polysiloxane composition comprising:
(a) a base resin composition comprising:
(i) a MQ vinyl siloxane comprising three dimensional Q units (SiO 4/2 ) surrounded by M units (Me 3 SiO) comprising one or more vinyl substituents;
(ii) a polysiloxane comprising a hydride capable of undergoing addition curing with the one or more vinyl substituents in the MQ vinyl siloxane; and
(b) a lubricating liquid; wherein the lubricating liquid is a silanol or a partially fluorinated polysiloxane; and wherein the lubricating liquid is chemically and physically matched with the base resin in such a way that, when cured therewith to form a cured polysiloxane composition, the lubricating liquid spontaneously provides an overlayer of the lubricating liquid at an exposed surface of the cured polysiloxane composition to form the slippery surface.
2. The curable polysiloxane composition according to claim 1 , wherein the lubricating liquid is a silanol having a kinematic viscosity of about 1000 cSt to about 100 cSt.
3. The curable polysiloxane composition according to claim 2 , wherein the silanol is a homopolymer.
4. The curable polysiloxane composition according to claim 1 , wherein the lubricating liquid is a partially fluorinated polysiloxane.
5. The curable polysiloxane composition according to claim 4 , wherein the partially fluorinated polysiloxane is a copolymer of a silicone and a fluoro-silicone.
6. The curable polysiloxane composition according to claim 4 , wherein the partially fluorinated polysiloxane is a copolymer of dimethylsiloxane and a fluoropropylmethylsiloxane.
7. The curable polysiloxane composition according to claim 6 , wherein the fluoropropylmethylsiloxane is a trifluoropropylmethylsiloxane.
8. The curable polysiloxane composition according to claim 1 , wherein the lubricating liquid is present in the polysiloxane composition at a weight percentage of about 30% or greater based upon a total weight of the curable polysiloxane composition.
9. The curable polysiloxane composition according to claim 1 , wherein the polysiloxane comprises terminal trimethylsiloxy groups; and
wherein the polysiloxane is a polymethylhydrosiloxane homopolymer or a co-polymer of methylhydrosiloxane and dimethylsiloxane.
10. The curable polysiloxane composition according to claim 1 , wherein the polysiloxane composition is transparent.
11. The curable polysiloxane composition according to claim 1 , wherein the polysiloxane is a co-polymer of methylhydrosiloxane and dimethylsiloxane;
wherein the lubricating liquid is a silanol-terminated polydimethylsiloxane having a kinematic viscosity of about 1000 cSt to about 100 cSt; and
wherein the lubricating liquid is present in the polysiloxane composition at a weight percentage of about 25% or greater based upon a total weight of the curable polysiloxane composition.
12. The curable polysiloxane composition according to claim 1 , wherein the polysiloxane is a trimethylsiloxane terminated co-polymer of methylhydrosiloxane and dimethylsiloxane;
wherein the lubricating liquid is a copolymer of dimethylsiloxane and a fluoropropylmethylsiloxane; and
wherein the lubricating liquid is present in the polysiloxane composition at a weight percentage of about 25% or greater based upon a total weight of the curable polysiloxane composition.
13. A slippery coating made by a process comprising:
applying a curable polysiloxane composition to a substrate; and
curing the polysiloxane composition to form a slippery coating; wherein the curable polysiloxane composition comprises:
(a) a base resin composition comprising:
(i) a MQ vinyl siloxane comprising three dimensional Q units (SiO 4/2 ) surrounded by M units (Me 3 SiO) comprising one or more vinyl substituents;
(ii) a polysiloxane comprising a hydride capable of undergoing addition curing with the one or more vinyl substituents in the MQ vinyl siloxane; and
(b) a lubricating liquid; wherein the lubricating liquid is a silanol or a partially fluorinated polysiloxane; and wherein the lubricating liquid is chemically and physically matched with the base resin in such a way that, when cured therewith to form a cured polysiloxane composition, the lubricating liquid spontaneously provides an overlayer of the lubricating liquid at an exposed surface of the cured polysiloxane composition to form the slippery surface.
14. The slippery coating according to claim 13 , wherein the lubricating liquid is a silanol having a kinematic viscosity of about 1000 cSt to about 100 cSt.
15. The slippery coating according to claim 14 , wherein the silanol is a homopolymer.
16. The slippery coating according to claim 13 , wherein the lubricating liquid is a partially fluorinated polysiloxane.
17. The slippery coating according to claim 13 , wherein the partially fluorinated polysiloxane is a copolymer of a silicone and a fluoro-silicone.
18. The slippery coating according to claim 13 , wherein the partially fluorinated polysiloxane is a copolymer of dimethylsiloxane and a fluoropropylmethylsiloxane.
19. The slippery coating according to claim 18 , wherein the fluoropropylmethylsiloxane is a trifluoropropylmethylsiloxane.
20. The slippery coating according to claim 13 , wherein the lubricating liquid is present in the polysiloxane composition at a weight percentage of about 30% or greater based upon a total weight of the curable polysiloxane composition.
21. The slippery coating according to claim 13 , wherein the polysiloxane comprises terminal trimethylsiloxy groups; and
wherein the polysiloxane is a polymethylhydrosiloxane homopolymer or a co-polymer of methylhydrosiloxane and dimethylsiloxane.
22. The slippery coating according to claim 13 , wherein the slippery coating is transparent.
23. The slippery coating according to claim 13 , wherein the polysiloxane is a trimethylsiloxane terminated co-polymer of methylhydrosiloxane and dimethylsiloxane;
wherein the lubricating liquid is a silanol-terminated polydimethylsiloxane having a kinematic viscosity of about 1000 cSt to about 100 cSt; and
wherein the lubricating liquid is present in the polysiloxane composition at a weight percentage of about 25% or greater based upon a total weight of the curable polysiloxane composition.
24. The slippery coating according to claim 13 , wherein the polysiloxane is a trimethylsiloxane terminated co-polymer of methylhydrosiloxane and dimethylsiloxane;
wherein the lubricating liquid is a copolymer of dimethylsiloxane and a fluoropropylmethylsiloxane; and
wherein the lubricating liquid is present in the polysiloxane composition at a weight percentage of about 25% or greater based upon a total weight of the curable polysiloxane composition.
25. The slippery coating according to claim 13 , wherein the curable polysiloxane composition is combined with fillers and pigments to form a paint applied to the substrate; and
wherein the slippery coating prevents or delays accumulation of an organism on the substrate.
26. The slippery coating according to claim 25 , wherein the substrate is a component of an article selected from the group consisting of a marine vessel and other marine structures, an optical lens, a camera, a medical device, a pipe, a cable, a container, a hydrofoil, a building, a processing equipment, and an adhesive film.
27. The slippery coating according to claim 13 , wherein the slippery coating exhibits little or no leachate toxicity when measured according to ISO 10993-5 cytotoxicity test.
28. The slippery coating according to claim 13 , where the overlayer of the lubricating liquid over the exposed surface is self-replenishing.
29. The slippery coating according to claim 13 , wherein the overlayer over the exposed surface comprises a low sliding angle of less than about 20° for a 15 μL water droplet.
30. The slippery coating according to claim 13 , wherein the slippery surface has anti-fouling properties.