Flame retardant clear coatings for building panels
Described herein is a flame-retardant building panel comprising a body having a first major surface opposite a second major surface, an inorganic coating atop the first major surface, the inorganic coating being optically transparent and flame retardant and comprising a silicate compound; and wherein the inorganic flame retardant coating is substantially transparent such that the first major surface of the body is visible through the inorganic coating.
1 . A flame-retardant coating composition comprising:
a liquid carrier;
a first sub-layer comprising an inorganic composition:
a first silicate compound;
a dispersant; and
an oxidizer;
a second sub-layer comprising:
a wax blend comprising refined paraffin wax and polyethylene wax;
a second silicate compound; and
aluminum trihydrate;
wherein the flame-retardant coating composition has a minimum pH of 9; and
wherein at least one of the first silicate compound and the second silicate compound comprises potassium silicate.
2 . The flame-retardant coating composition according to claim 1 , wherein the dispersant comprises a first dispersant that is non-ionic and a second dispersant that is ionic.
3 . The flame-retardant coating composition according to claim 1 , wherein the flame-retardant coating composition has a pH ranging from about 11 to about 12.
4 . The flame-retardant coating composition according to claim 1 , wherein the first silicate compound is potassium silicate and the second silicate compound is potassium silicate.
5 . The flame-retardant coating composition according to claim 1 , wherein the alumina trihydrate is present in an amount ranging from about 0.5 wt. % to about 12.5 wt. % based on the total weight of the coating composition.
6 . The flame-retardant coating composition according to claim 1 , wherein the liquid carrier is present in an amount ranging from about 40 wt. % to about 95 wt. % based on the total weight of the flame-retardant coating composition.
7 . The flame-retardant coating composition according to claim 1 , wherein the dispersant is present in an amount ranging from a non-zero value up to about 1.5 wt. % based on the total weight of the flame-retardant coating composition.
8 . The flame-retardant coating composition according to claim 1 , wherein the dispersant comprises propoxylated ethoxylated linear alcohol.
9 . The flame-retardant coating composition according to claim 1 , wherein the oxidizer comprises hydrogen peroxide.
10 . The flame-retardant coating composition according to claim 1 , wherein the oxidizer is present in an amount ranging from about 0.1 wt. % to about 2.0 wt. % based on the total weight of the flame-retardant coating composition.
11 . The flame-retardant coating composition according to claim 1 , wherein the dispersant comprises sodium polyacrylate.