Curable composition for cured in place pipes
Disclosed is a curable composition with enhanced curing time at ambient temperatures, the curable composition including (a) a resin, e.g., 4,4′-isopropylidenediphenol-epichlorohydrin copolymer and (b) one or more curing agents, wherein a ratio of a weight percentage of the resin to a weight percentage of the curing agent or curing agents is from about 12:1 to about 15:1. Also disclosed is a method of curing a cured-in-place liner, wherein the cured-in-place liner contains the above curable composition.
1. A curable composition comprising,
(a) a resin comprising 4,4′-isopropylidenediphenol-epichlorohydrin copolymer;
(b) one or more curing agents of Formula (I):
wherein A is —CH 2 —;
R is a C 1 -C 3 alkylene chain, wherein the hydroxyl group may be attached to any of the carbon atoms of the alkylene chain;
R 1 and R 2 are each independently hydrogen; and
X is a carboxylate anion,
wherein a ratio of a weight percentage of the resin to a weight percentage of the curing agent or curing agents of formula (I) is from about 12:1 to about 15:1;
(c) a diluent which is a monofunctional epoxide selected from C 12 -C 14 glycidyl ethers;
(d) a filler;
(e) a rheology modifier; and
(f) a defoamer;
wherein said curable composition has a gel time of about 12 to about 24 hours when cured in a cured-in-place liner at 21° C.
2. The curable composition of claim 1 , wherein X is the carboxylate anion of a carboxylic acid comprising from 1 to about 40 carbon atoms.
3. The curable composition of claim 1 , wherein the ratio of the weight percentage of the resin to the weight percentage of the curing agent or curing agents of formula (I) is from about 12:1 to about 14:1.
4. The curable composition of claim 3 , wherein the ratio of the weight percentage of the resin to the weight percentage of the curing agent or curing agents of formula (I) is about 12:1.
5. The curable composition of claim 1 , wherein the composition requires a temperature of at least about 85° C. to begin a curing process.
6. The curable composition of claim 1 , wherein the composition begins a curing process at a temperature of about 60° C. to about 85° C.
7. The curable composition of claim 1 , wherein the composition has a gel time of about 14 hours to about 22 hours at a temperature of 21° C.
8. The curable composition of claim 7 , wherein the composition has a gel time of about 16 hours to about 20 hours at a temperature of 21° C.
9. The curable composition of claim 1 , wherein the curing agent is a carboxylate of an amine selected from N-hydroxypropylpiperidine, N-hydroxymethylpiperidine, N-hydroxyethylpiperidine, and combinations thereof.
10. The curable composition of claim 9 , wherein the carboxylate is a carboxylate anion of an acid selected from tall oil fatty acid (TOFA), oleic acid, acetic acid, propanoic acid, 2-ethylhexanoic acid, decanoic acid, and hexanoic acid, succinic acid, glutaric acid, adipic acid, and pimelic acid.
11. The curable composition of claim 9 , wherein a ratio of a weight percentage of the resin to a weight percentage of the curing agent or curing agents of formula (I) is from 12:1 to 15:1.
12. The curable composition of claim 9 , wherein a ratio of a weight percentage of the resin to a weight percentage of the curing agent or curing agents of formula (I) is from 12:1 to 13:1.
13. The curable composition of claim 9 , wherein the curing agent is a carboxylate of an amine selected from N-hydroxymethylpiperidine, N-hydroxyethylpiperidine, and combinations thereof.
14. The curable composition of claim 13 , wherein the curing agent is a carboxylate of N-hydroxyethylpiperidine.
15. The curable composition of claim 14 , wherein a ratio of a weight percentage of the resin to a weight percentage of the curing agent or curing agents of formula (I) is from 12:1 to 13:1.
16. The curable composition of claim 13 , wherein a ratio of a weight percentage of the resin to a weight percentage of the curing agent or curing agents of formula (I) is from 12:1 to 13:1.