Curable two-part coatings for conductors
A compositional kit for forming a composition includes a first composition and a second composition which are separate. The first composition includes a filler, a cross-linking agent and an emissivity agent; and the second composition includes a silicate binder. Methods for making a compositional kit and for making a coated overhead conductor are also provided.
1. A method for making a compositional kit, the method comprising:
a. mixing a first composition comprising from about 2% to about 55% of a filler, by dry weight of the compositional kit, wherein the filler comprises about 1% to about 18% talc and about 1% to about 15% calcined kaolin; about 5% to about 20% of a cross-linking agent, by dry weight of the compositional kit, wherein the crosslinking agent comprises one or more of magnesium hydroxide and magnesium oxide; and an emissivity agent, the emissivity agent comprising one or more of gallium oxide, cerium oxide, zirconium oxide, silicon hexaboride, carbon tetraboride, silicon tetraboride, silicon carbide, molybdenum disilicide, tungsten disilicide, zirconium diboride, cupric chromite, boron carbide, boron silicide, copper chromium oxide, aluminum nitride, boron oxide, titanium dioxide, and magnesium oxide, wherein the emissivity agent comprises about 1% to about 12% of one or more of boron carbide, boron oxide, silicon carbide, and cerium oxide; and about 5% to about 30% titanium dioxide, and wherein the first composition is free of a metal silicate binder; and
b. mixing a second composition comprising a metal silicate binder, wherein the metal silicate binder comprises about 20% to about 65% potassium silicate; and
c. maintaining separation between the first composition and the second composition so as to prevent premature curing resulting from a reaction between the cross-linking agent of the first composition and the metal silicate binder of the second composition.
2. A method for making a compositional kit to form a curable coating composition, the method comprising:
a. mixing a first composition comprising from about 2% to about 55% of a filler, by dry weight of the compositional kit, wherein the filler comprises about 1% to about 18% talc and about 1% to about 15% calcined kaolin; about 5% to about 20% of a cross-linking agent, by dry weight of the compositional kit, wherein the crosslinking agent comprises one or more of magnesium hydroxide and magnesium oxide; and an emissivity agent, wherein the emissivity agent comprises about 1% to about 12% of one or more of boron carbide, boron oxide, silicon carbide, and cerium oxide; and about 5% to about 30% titanium dioxide; and
b. mixing a second composition comprising a metal silicate binder, wherein the metal silicate binder comprises about 20% to about 65% potassium silicate; and
wherein the first composition and the second composition are separated.
3. The method of claim 2 , wherein the filler has an average particle size of about 50 microns or less and further comprises one or more of quartz, aluminum oxide, mica, wallastonite, calcite, zirconia, zircon, micacious iron oxide, iron oxide, aluminum silicates, barium sulphate, and lithopone.
4. The method of claim 2 , wherein the crosslinking agent further comprises zinc oxide.
5. The method of claim 2 , wherein the first composition further comprises additional emissivity agents, wherein the additional emissivity agents comprise one or more of zinc oxide, silicon dioxide, manganese oxide, chromium oxide, iron oxide, titanium dioxide, boron nitride, and alumina.
6. The method of claim 2 , wherein the second composition comprises about 20% to about 65% of the metal silicate binder, by dry weight of the compositional kit; and wherein the metal silicate binder further comprises one or more of sodium silicate, lithium silicate, calcium silicate, and magnesium aluminum silicate.
7. The method of claim 2 , wherein
about 0% to about 10% aluminum oxide and about 2.5% to about 30% quartz.
8. The method of claim 2 , wherein at least one of the first composition and the second composition further comprises one or more of a stabilizer, an emulsifier, and a defoamer.
9. The method of claim 2 , further comprising the addition of water to at least one of the first composition and the second composition and mixing the water to form a wet admixture.
10. The method of claim 9 , wherein water is added to the first composition and the second composition and wherein the first composition has a total solids content range of about 30% to about 55% and the second composition has a total solids content range of about 20% to about 50%.