Coated conduits and methods of repairing or reinforcing conduits

Patent metadata

Field	Value
Publication number	US-11415261-B2
Application number	US-202016997165-A
Country	US
Kind code	B2
Filing date	Aug 19, 2020
Priority date	Aug 17, 2016
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

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.

First claim

Therefore, what is claimed is:

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.

Assignees

• Ppg Coatings Europe Bv
• Ppg Ind Ohio Inc

Inventors

• Cash Brandon
• Kutchko Cynthia
• Senkfor Howard L
• Millero Jr Edward R
• Olson Kurt G
• Watson James C

Classifications

• B05D7/24

  for applying particular liquids or other fluent materials · CPC title

• F16L58/10 Primary

  by rubber or plastics · CPC title

• F16L1/26

  Repairing or joining pipes on or under water · CPC title

• B32B1/08

  Tubular products · CPC title

• F16L59/15

  for underground pipes · CPC title