Zinc-containing magnesium oxychloride cements providing fire resistance and an extended pot-life
OwnerPeter P. Policastro, Raj S. Tarnejainventors
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Abstract
A fire barrier composition in the form of a zinc-containing magnesium oxychloride cement is described. The composition exhibits a prolonged pot-life as well as reduced thermal popping when applied to a substrate as a coating. The fire barrier composition can be used for rendering a flammable substrate fire resistant and for encapsulating lead paint.
Claims26
A fluid, substantially homogeneous, aqueous mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to impart to said mixture a pot-life of about 1 hour to about 6 hours;
- and
- (d) water.
A fluid, substantially homogeneous, aqueous mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to reduce the amount of thermal popping after said mixture is applied to a substrate and cured on the substrate;
- and
- (d) water.
A fluid, substantially homogeneous, aqueous mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to obtain a value of "3" in a thermal shock test after said mixture is applied to a substrate at about 20 mils dry thickness and allowed to cure under ambient conditions for a period of about 2 weeks;
- and
- (d) water.
A method for rendering a material fire resistant comprising applying the mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to impart to said mixture a pot-life of about 1 hour to about 6 hours;
- and
- (d) water.
A method for rendering a material fire resistant comprising applying the mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to reduce the amount of thermal popping after said mixture is applied to a substrate and cured on the substrate;
- and
- (d) water
A method for rendering a material fire resistant comprising applying the mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to obtain a value of "3" in a thermal shock test after said mixture is applied to a substrate at about 20 mils dry thickness and allowed to cure under ambient conditions for a period of about 2 weeks;
- and
- (d) water.
A method for rendering a material fire resistant comprising applying the mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- p1 (c) a zinc-containing, organic or inorganic compound in an amount sufficient to impart to said mixture a pot-life of about 1 hour to about 6 hours;
- and
- (d) water.
A method for rendering a material fire resistant comprising applying the mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to reduce the amount of thermal popping after said mixture is applied to a substrate and cured on the substrate;
- and
- (d) water.
A method for rendering a material fire resistant comprising applying the mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to obtain a value of "3" in a thermal shock test after said mixture is applied to a substrate at about 20 mils dry thickness and allowed to cure under ambient conditions for a period of about 2 weeks;
- and
- (d) water.
A method for encapsulating lead paint comprising applying the mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to impart to said mixture a pot-life of about 1 hour to about 6 hours;
- and
- (d) water.
A method for encapsulating lead paint comprising applying the mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to reduce the amount of thermal popping after said mixture is applied to a substrate and cured on the substrate;
- and
- (d) water.
A method for encapsulating lead paint comprising applying the mixture comprising:
- (a) magnesium oxide;
- (b) magnesium chloride in an amount sufficient to form a magnesium oxychloride cement with said magnesium oxide;
- (c) a zinc-containing, organic or inorganic compound in an amount sufficient to obtain a value of "3" in a thermal shock test after said mixture is applied to a substrate at about 20 mils dry thickness and allowed to cure under ambient conditions for a period of about 2 weeks;
- and
- (d) water.
Dependencies are inferred from the claim text.