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 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, wherein 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.
2. The coated conduit of claim 1 , wherein the conduit comprises an underground pipe.
3. The coated conduit of claim 1 , wherein the reaction mixture is applied to the interior surface of the conduit.
4. The coated conduit of claim 1 , wherein the reaction mixture is applied to the exterior surface of the conduit.
5. The coated conduit 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;
(iii) 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.
6. The coated conduit of claim 5 , 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.
7. The coated conduit of claim 6 , wherein the polyisocyanate used to chain extend the polyetheramine and/or polyether polyol comprises isophorone diisocyanate.
8. The coated conduit of claim 6 , wherein the amine-functional compound b) comprises a primary amine and/or a secondary amine.
9. The coated conduit of claim 1 , wherein the filler material i) comprises chopped glass fibers, carbon fibers, and/or cellulose fibers.
10. The coated conduit of claim 9 , wherein the fibers are coated with a sizing.
11. The coated conduit of claim 1 , wherein the filler material i) comprises corrosion resistant glass fibers.
12. The coated conduit of claim 1 , wherein the filler material is present in the reaction mixture in an amount of 1 to 50 percent by weight, based on the total weight of resin solids in reaction mixture.
13. The coated conduit of claim 5 , wherein the reactive component comprises (ii) a) an isocyanate functional compound and b) a hydroxyl and/or thiol functional compound.
14. The coated conduit of claim 5 , wherein the reactive component comprises (iii) a) an acid-functional compound and b) an epoxide functional compound.
15. The coated conduit of claim 5 , wherein the reactive component comprises (iv) a) an ethylenically unsaturated compound and b) an amine functional compound.
16. The coated conduit of claim 5 , wherein the reactive component comprises (v) a) cyclic carbonate functional compound and b) an amine functional compound.
17. The coated conduit of claim 5 , wherein the reactive component comprises (vi) a) an acetoacetate functional compound and b) an amine functional compound.
18. The coated conduit of claim 5 , wherein the reactive component comprises (vii) a) an epoxide functional compound and b) an amine functional compound.
19. The coated conduit of claim 5 , wherein the reactive component comprises (viii) a) a thiol functional compound and b) an ethylenically unsaturated compound.
20. The coated conduit of claim 5 , wherein the reactive component comprises (ix) a) an ethylenically unsaturated compound and b) a malonate functional compound.