Sealant composition
The present invention is directed to a sealing composition comprising: (a) a polysiloxane; (b) a reactive polysiloxane comprising at least one reactive functional group; and (c) water; wherein the weight ratio of polysiloxane to reactive polysiloxane is from 2.7:1 to 4:1. Also disclosed are coated substrates and methods of coating a substrate.
1. A sealing composition comprising:
(a) a polysiloxane, wherein the polysiloxane comprises alkoxy groups;
(b) a reactive polysiloxane comprising at least one reactive functional group; and
(c) water;
wherein the solids weight ratio of polysiloxane to reactive polysiloxane is from 1.7:1 to 4:1.
2. The sealing composition of claim 1 , wherein the polysiloxane comprises at least one silicone resin.
3. The sealing composition of claim 1 , wherein the polysiloxane further comprises (meth)acrylate groups, polyether groups, or combinations thereof.
4. The sealing composition of claim 1 , wherein the reactive polysiloxane comprises an amino-functional polysiloxane, a hydroxyl-functional polysiloxane, or combinations thereof.
5. The sealing composition of claim 1 , wherein the reactive polysiloxane comprises a polydimethylsiloxane comprising at least one reactive functional group, a silsesquioxane comprising at least one reactive functional group, or combinations thereof.
6. The sealing composition of claim 1 , further comprising an alkoxy silane.
7. The sealing composition of claim 1 , wherein the sealing composition is substantially free of alkoxy silane.
8. The sealing composition of claim 1 , further comprising a colorant.
9. The sealing composition of claim 1 , wherein sealing composition comprises a sealing composition concentrate having total solids of 30% to 70%, based on the total weight of the sealing composition, and a viscosity of 4 cST to 1,200 cST at ambient conditions, as measured by an efflux cup according to ASTM D4212.
10. The sealing composition of claim 1 , wherein the sealing composition comprises a diluted sealing composition having total solids of 0.5% to 10% by weight, based on the total weight of the sealing composition, and a viscosity of 1 cST to 5 cST at ambient conditions, as measured by an efflux cup according to ASTM D4212.
11. The sealing composition of claim 1 , further comprising a thickener, fungicide, biocide, mildewcide, dispersant, surfactant, wetting agent, hindered amine light stabilizer, ultraviolet radiation absorber, wax, acrylic resin, or combinations thereof.
12. The sealing composition of claim 1 , wherein the volatile organic content of the sealing composition is less than 400 g/L, as measured according to EPA Method 24.
13. The sealing composition of claim 1 , wherein the sealing composition is stable for at least 60 days.
14. The sealing composition of claim 1 , wherein the sealing composition is substantially free of ultraviolet radiation absorbing agents.
15. A flexible packaging kit comprising a flexible packaging and a flexible material having the sealing composition of claim 1 stored inside the flexible packaging.
16. A method of coating a substrate comprising applying a sealing composition to at least a portion of a surface of the substrate, wherein the sealing composition comprises:
(a) a polysiloxane;
(b) a reactive polysiloxane comprising at least one reactive functional group; and
(c) water;
wherein the solids weight ratio of polysiloxane to reactive polysiloxane is from 1.7:1 to 4:1.
17. The method of claim 16 , wherein applying the sealing composition to the surface of the substrate comprises application by wipe, brush, roller, spray pump, hose-adapter, or combinations thereof.
18. The method of claim 16 , wherein the substrate is a porous substrate comprising comprises a cellulosic material, cementitious material, composite material, or a material previously coated with a coating.
19. The method of claim 16 , further comprising pre-wetting the substrate with water prior to applying the sealing composition such that the sealing composition is applied to a wet surface of the substrate.
20. The method of claim 16 , further comprising cleaning the substrate surface with a cleaning composition prior to applying the sealing composition.
21. The method of claim 16 , wherein the sealing composition comprises a sealing composition concentrate, and the method further comprises diluting the sealing composition concentrate with water prior to applying the sealing composition to the substrate.
22. A substrate at least partially coated by a sealing composition, wherein the sealing composition comprises:
(a) a polysiloxane;
(b) a reactive polysiloxane comprising at least one reactive functional group; and
(c) water;
wherein the solids weight ratio of polysiloxane to reactive polysiloxane is from 1.7:1 to 4:1.
23. The substrate of claim 22 , wherein the sealing composition at least partially impregnates into the substrate.
24. The substrate of claim 22 , wherein the substrate comprises a cellulosic material, cementitious material, composite material, or a material previously coated with a coating.
25. The substrate of claim 22 , wherein the substrate has a surface tension of less than 40 dynes/cm, as measured by the SURFACE TENSION METHOD.
26. The substrate of claim 22 , wherein the surface tension of the substrate is reduced by at least 30% with respect to a corresponding uncoated substrate.