Coated conduits and methods of repairing or reinforcing conduits
The present invention is directed to a coated conduit comprising: a) a conduit having an interior and exterior surface; and b) a cured coating formed from a reaction mixture that is applied to at least one surface of the conduit. The reaction mixture comprises: i) a filler material comprising fibers ranging in length from 0.1 to 15.54 cm and having an aspect ratio of at least 5; and ii) a reactive component that demonstrates a tack-free time of less than five minutes at a temperature of 20 to 25° C. The present invention is also directed to a method of repairing or reinforcing a conduit, comprising: (a) applying a curable coating composition to at least one surface of the conduit, wherein the curable coating composition is formed from the reaction mixture described above; and (b) allowing the curable coating composition to at least partially cure by exposing the composition to ambient conditions.
1. A method of repairing or reinforcing a conduit, comprising:
(a) applying a curable coating composition to at least one surface of the conduit, wherein the curable coating composition is formed from a reaction mixture comprising:
(i) a filler material comprising fibers ranging in length from 0.1 to 15.54 cm and having an aspect ratio of at least 5; and
(ii) a reactive component that demonstrates a tack-free time of less than five minutes at a temperature of 20 to 25° C.; and
(b) allowing the curable coating composition to at least partially cure by exposing the composition to ambient conditions.
2. The method of claim 1 , wherein the curable coating composition is applied to the surface by spraying.
3. The method of claim 1 , wherein the conduit comprises an underground pipe.
4. The method of claim 1 , wherein the curable coating composition is applied to the interior surface of the conduit.
5. The method of claim 1 , wherein the curable coating composition is applied to the exterior surface of the conduit.
6. The method of claim 1 , wherein the reactive component comprises:
(i) a) an isocyanate functional compound and b) an amine functional compound;
(ii) a) an isocyanate functional compound and b) a hydroxyl and/or thiol functional compound;
(iiii) a) an acid-functional compound and b) an epoxide functional compound;
(iv) a) an ethylenically unsaturated compound and b) an amine functional compound;
(v) a) cyclic carbonate functional compound and b) an amine functional compound;
(vi) a) an acetoacetate functional compound and b) an amine functional compound;
(vii) a) an epoxide functional compound and b) an amine functional compound;
(viii) a) a thiol functional compound and b) an ethylenically unsaturated compound; or
(ix) a) an ethylenically unsaturated compound and b) a malonate functional compound.
7. The method of claim 6 , wherein the reactive component comprises (i) a) an isocyanate functional compound and b) an amine functional compound, wherein the isocyanate-functional compound comprises a prepolymer prepared from a polyetheramine and/or polyether polyol chain extended with a polyisocyanate.
8. The method of claim 7 , wherein the polyisocyanate used to chain extend the polyetheramine and/or polyether polyol comprises isophorone diisocyanate.
9. The method of claim 7 , wherein the amine-functional compound comprises a primary amine and/or a secondary amine.
10. The method of claim 1 , wherein the filler material (i) comprises chopped glass fibers, carbon fibers, and/or cellulose fibers.
11. The method of claim 10 , wherein the fibers are coated with a sizing.
12. The method of claim 1 , wherein the filler material (i) comprises corrosion resistant glass fibers.
13. The method of claim 1 , wherein the filler material (i) is present in the curable coating composition in an amount of 1 to 50 percent by weight, based on the total weight of resin solids in the curable coating composition.
14. The method of claim 6 , wherein the reactive component comprises (ii) a) an isocyanate functional compound and b) a hydroxyl and/or thiol functional compound.
15. The method of claim 6 , wherein the reactive component comprises (iii) a) an acid-functional compound and b) an epoxide functional compound.
16. The method of claim 6 , wherein the reactive component comprises (iv) a) an ethylenically unsaturated compound and b) an amine functional compound.
17. The method of claim 6 , wherein the reactive component comprises (v) a) cyclic carbonate functional compound and b) an amine functional compound.
18. The method of claim 6 , wherein the reactive component comprises (vi) a) an acetoacetate functional compound and b) an amine functional compound.
19. The method of claim 6 , wherein the reactive component comprises (vii) a) an epoxide functional compound and b) an amine functional compound.
20. The method of claim 6 , wherein the reactive component comprises (viii) a) a thiol functional compound and b) an ethylenically unsaturated compound.
21. The method of claim 6 , wherein the reactive component comprises (ix) a) an ethylenically unsaturated compound and b) a malonate functional compound.
22. The method of claim 1 , wherein step (b) comprises allowing the curable coating composition to cure by exposing the composition to ambient conditions.