Curable compositions for cured-in-place pipes

Abstract

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 - 30 . (canceled) 
     
     
         31 . A curable composition comprising,
 (a) a resin comprising 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.   
     
     
         32 . The curable composition of  claim 32 , further including one or more of:
 (c) a diluent which is a monofunctional epoxide selected from C 12 -C 14  glycidyl ethers;   (d) a rheology modifier; and   (e) a defoamer.   
     
     
         33 . The curable composition of  claim 31 , wherein at least one of the one or more curing agents is of Formula (I): 
       
         
           
           
               
               
           
         
         wherein A is —O—, —CH 2 —, or —NR′—, R′ is hydrogen or an optionally substituted C 1 -C 10  alkyl or C 2 -C 10  alkenyl group; R is a C 1 -C 6  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, hydroxyl, or an optionally substituted C 1 -C 20  alkyl, C 2 -C 20  alkenyl, C 1 -C 20  haloalkyl, C 2 -C 20  haloalkenyl, or C 6 -C 10  aryl; and X is a carboxylate anion. 
       
     
     
         34 . The curable composition of  claim 32 , wherein X is the carboxylate anion of a carboxylic acid comprising from 1 to about 40 carbon atoms. 
     
     
         35 . The curable composition of  claim 31 , wherein the ratio of the weight percentage of the resin to the weight percentage of the curing agent or curing agents is from about 12:1 to about 14:1. 
     
     
         36 . The curable composition of  claim 35 , wherein the ratio of the weight percentage of the resin to the weight percentage of the curing agent or curing agents is about 12:1. 
     
     
         37 . The curable composition of  claim 31 , wherein the composition requires a temperature of at least about 85° C. to begin a curing process. 
     
     
         38 . The curable composition of  claim 31 , wherein the composition begins a curing process at a temperature of about 60° C. to about 85° C. 
     
     
         39 . The curable composition of  claim 31 , wherein the composition has a gel time of about 12 hours to about 24 hours at a temperature of ° C. 
     
     
         40 . The curable composition of  claim 38 , wherein the composition has a gel time of about 14 hours to about 22 hours at a temperature of ° C. 
     
     
         41 . The curable composition of  claim 40 , wherein the composition has a gel time of about 16 hours to about 20 hours at a temperature of 21° C. 
     
     
         42 . The curable composition of  claim 40 , wherein the composition has a gel time of 16 hours to 20 hours at a temperature of 21° C. 
     
     
         43 . A method of curing a cured-in-place liner, wherein the method comprises:
 (i) placing the cured-in-place liner in a pipe and   (ii) heating the cured-in-place liner,   wherein the cured-in-place liner contains a curable composition comprising,   (a) a resin comprising 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.   
     
     
         44 . The method of  claim 43 , wherein the curable composition further includes one or more of:
 (c) a diluent which is a monofunctional epoxide selected from C 12 -C 14  glycidyl ethers;   (d) a rheology modifier; and   (e) a defoamer.   
     
     
         45 . The method of  claim 43 , wherein at least one of the one or more curing agents is of Formula (I): 
       
         
           
           
               
               
           
         
         wherein A is —O—, —CH 2 —, or —NR′—, R′ is hydrogen or a an optionally substituted C 1 -C 10  alkyl or C 2 -C 10  alkenyl group; R is a C 1 -C 6  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, hydroxyl, or an optionally substituted C 1 -C 20  alkyl, C 2 -C 20  alkenyl, C 1 -C 20  haloalkyl, C 2 -C 20  haloalkenyl, or C 6 -C 10  aryl; and X is a carboxylate anion. 
       
     
     
         46 . The method of  claim 43 , wherein the ratio of the weight percentage of the resin to the weight percentage of the curing agent or curing agents is from about 12:1 to about 14:1. 
     
     
         47 . The method of  claim 46 , wherein the ratio of the weight percentage of the resin to the weight percentage of the curing agent or curing agents is about 12:1. 
     
     
         48 . The method of  claim 43 , wherein the cured-in-place liner is heated to a temperature of at least about 85° C. 
     
     
         49 . The method of  claim 43 , wherein the cured-in-place liner is heated to a temperature of about 60° C. to about 85° C. 
     
     
         50 . The method of  claim 43 , wherein the curable composition has a gel time of 16 hours to 20 hours at a temperature of 21° C.