AMBIENT CURED COATING COMPOSITIONS FOR CABLES AND CABLE ACCESSORIES
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.
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.