Ambient cured coating compositions for cables and cable accessories

Abstract

Compositions including a filler, an emissivity agent, a crosslinking facilitator, and a metal silicate binder are disclosed. The compositions can be curable at ambient conditions. Methods of coating overhead conductor and power transmission line accessories with such coating compositions are also disclosed.

What is claimed is: 
     
         1 . A composition comprising:
 a filler;   an emissivity agent;   a crosslinking facilitator comprising a latent acid compound; and   a metal silicate binder.   
     
     
         2 . The composition of  claim 1 , wherein the latent acid compound is configured to release an acid component when subject to an environment having a pH of about 9 or more. 
     
     
         3 . The composition of  claim 1  crosslinks at a temperature of from about 15° C. to about 40° C. and at a pH of about 11 or less. 
     
     
         4 . The composition of  claim 1 , wherein the filler comprises one or more of talc, calcined kaolin, aluminum oxide, aluminosilicate, and quartz. 
     
     
         5 . The composition of  claim 1 , wherein the emissivity agent comprises one or more of silicon carbide, boron carbide, and titanium dioxide. 
     
     
         6 . The composition of  claim 1 , wherein the latent acid compound comprises condensed aluminum phosphate. 
     
     
         7 . The composition of  claim 1 , wherein the crosslinking facilitator further comprises an amphoteric metal powder. 
     
     
         8 . The composition of  claim 1 , wherein the metal silicate binder comprises one or more of potassium silicate, sodium silicate, lithium silicate, and colloidal silica. 
     
     
         9 . The composition of  claim 1  comprises:
 about 35% to about 45%, by dry weight, of the filler; 
 about 15% to about 22%, by dry weight, of the emissivity agent; 
 about 4% to about 10%, by dry weight, of the crosslinking facilitator; and 
 about 25% to about 40%, by dry weight, of the metal silicate binder. 
 
     
     
         10 . The composition of  claim 1  comprises the crosslinking facilitator at about 10% to about 30% by weight of the metal silicate binder. 
     
     
         11 . The composition of  claim 1  further comprising a liquid carrier, and wherein the total solids content of the composition is about 35% to about 55%. 
     
     
         12 . The composition of  claim 11 , wherein the liquid carrier comprises water. 
     
     
         13 . An aluminum substrate coated with a coating formed from the cured composition of  claim 1 . 
     
     
         14 . The aluminum substrate of  claim 13  is an overhead conductor, and wherein the overhead conductor prior to being coated is a pre-existing installed overhead conductor. 
     
     
         15 . The aluminum substrate of  claim 13  is an overhead conductor, and wherein the overhead conductor has an operating temperature that is about 10° C. lower than the operating temperature of an uncoated overhead conductor. 
     
     
         16 . The aluminum substrate of  claim 13  is an overhead conductor, and wherein the overhead conductor passes a 0.5 inch mandrel bend test. 
     
     
         17 . A method of forming a coated article, comprising:
 providing a coating composition comprising:
 a filler; 
 an emissivity agent; 
 a crosslinking facilitator comprising a latent acid compound; and 
 a metal silicate binder; 
   applying the coating composition onto the outer surface of an article; and   curing the coating composition at a temperature of from about 15° C. to about 40° C. to form the coated article.   
     
     
         18 . The method of  claim 17 , wherein the coating composition comprises two parts; and
 wherein the first part and the second part are mixed together to form the coating composition; and   wherein the first part comprises the filler, the emissivity agent, and the crosslinking facilitator and the second part comprises the metal silicate binder.   
     
     
         19 . The method of  claim 17 , wherein the touch to dry time is about 2 hours or less after curing is initiated. 
     
     
         20 . The method of  claim 17 , wherein curing is complete after about 10 days.