Paint composition
Fire retardant paint compositions comprising polymeric binders derived from vinyl ester monomer, polyphosphate salts, nitrogen containing blowing agents, and charring agents are provided. When applied to substrates the paint compositions form durable coatings useful in protecting the substrates from fire.
1 . A fire retardant paint composition comprising:
a) about 8 to about 20 wt. % of a terpolymer comprising vinyl acetate, ethylene, and vinyl ester;
b) about 15 to about 35 wt. % of one or more polyphosphate salts having a solubility in water of less than about 2 wt. % at 20° C.;
c) about 20 to about 40 wt. % water;
d) about 5 to about 15 wt. % of melamine as a blowing agents; and
e) about 5 to about 15 wt. % of dipentaerythritol as a charring agent; based on a total weight percent of the paint composition.
2 . The fire retardant paint composition according to claim 1 , comprising:
a) about 10 to about 18 wt. % of the terpolymer comprising vinyl acetate, ethylene, and vinyl ester;
b) about 20 to about 30 wt. % of one or more polyphosphate salts having a solubility in water of less than about 2 wt. % at 20° C.;
c) about 25 to about 35 wt. % water;
d) about 5 to about 15 wt. % of melamine as a blowing agent; and
e) about 5 to about 15 wt. % of dipentaerythritol as a one or more charring agent;
based on the total weight percent of the paint composition.
3 . The fire retardant paint composition according to claim 1 , further comprising one or more inorganic fillers in an amount from about 3 to about 15 wt. %, based on the total weight percent of the paint composition.
4 . The fire retardant paint composition according to claim 1 , further comprising one or more char strengthening enhancers in an amount from about 0.5 to about 5 wt. %, based on the total weight percent of the paint composition.
5 . The fire retardant paint composition according to claim 1 , further comprising one or more auxiliaries selected from UV resistance additives, dispersing agents, biocides, wetting agents, defoamers, coalescents, and thickeners.
6 . The fire retardant paint composition according to claim 1 , wherein the one or more polyphosphate salts comprise one or more of alkali metal polyphosphate, ammonium polyphosphate and melamine polyphosphate.
7 . The fire retardant paint composition according to claim 1 , wherein the one or more polyphosphate salts has a solubility in water of less than about 1 wt. %, at 20° C.
8 . The fire retardant paint composition according to claim 3 , wherein the one or more inorganic fillers comprise one or more of titanium dioxide, zinc oxide, aluminium hydroxide, magnesium hydroxide, silica, silicates, and calcium carbonate.
9 . The fire retardant paint composition according to claim 4 , wherein the one or more char strengthening enhancers comprise one or more of rockwool, glass fiber, carbon fiber, silicon carbide fiber, carbon nanotubes, and halloysite nanotubes.
10 . A fire retardant paint composition according to claim 1 , comprising:
a) about 8 to about 20 wt. % of the terpolymer comprising vinyl acetate, ethylene, and vinyl ester;
b) about 15 to about 35 wt. % of one or more polyphosphate salts having a solubility in water of less than about 2 wt. %;
c) about 20 to about 40 wt. % water;
d) about 5 to about 15 wt. % of melamine;
e) about 5 to about 15 wt. % of dipentaerythritol; and
f) about 3 to about 15 wt. % of titanium dioxide. based on the total weight percent of the paint composition.
11 . A method of protecting a substrate against fire comprising the step of applying the fire retardant paint composition according to claim 1 to the substrate.
12 . The method according to claim 11 , wherein the applying comprises brushing or spraying.
13 . The method according to claim 11 , wherein the substrate comprises timber, brick, concrete, metal, or plasterboard.
14 . The method according to claim 13 , wherein the timber is interior timber.
15 . The fire retardant paint composition according to claim 1 , wherein a weight ratio of a sum of polyphosphate salt, melamine, and dipentaerythritol, to the terpolymer comprising vinyl acetate, ethylene, and vinyl ester is less than about 5.
16 . The fire retardant paint composition according to claim 1 , wherein a weight ratio of a sum of polyphosphate salt, melamine and dipentaerythritol, to the terpolymer comprising vinyl acetate, ethylene, and vinyl ester is from about 5 to about 2.
17 . The fire retardant paint composition according to claim 3 , wherein a weight ratio of the terpolymer comprising vinyl acetate, ethylene, and vinyl ester to one or more inorganic fillers is greater than 1.
18 . The fire retardant paint composition according to claim 1 , wherein the terpolymer comprises more than one terpolymer.