Compositions and methods for the protection of substrates from heat flux and fire

• US 8,993,463 B2
• Filed: 04/27/2011
• Issued: 03/31/2015
• Est. Priority Date: 08/01/2006
• Status: Active Grant

• Current Assignee: Rutgers University
• Original Assignee: Rutgers University
• Inventors: Nosker, Thomas, Lynch, Jennifer K., Mazar, Mark N., Nosker, Patrick L.
• Primary Examiner(s): Pierce, Jeremy R
• Application Number:
  US13/094,867
• Publication Number:
  US 20110200769A1
• Time in Patent Office: 1,434 Days
• Field of Search: 428/920, 428/921, 442/136, 442/172, 442/180, 523/219
• US Class Current: 442/136
• CPC Class Codes: C08K 7/14 Glass
• CPC Class Codes: C08K 7/28 Glass
• CPC Class Codes: C09D 183/04 Polysiloxanes
• CPC Class Codes: C09D 5/18 Fireproof paints including high temperature resistant paints
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: C09D 7/69 Particle size larger than 1000 nm
• CPC Class Codes: C09D 7/70 characterised by shape, e.g. fibres, flakes or microspheres
• CPC Class Codes: D06M 15/643 containing silicon in the main chain
• CPC Class Codes: D06M 2200/30 Flame or heat resistance, fire retardancy properties
• CPC Class Codes: D06N 3/0022 Glass fibres
• CPC Class Codes: D06N 3/0063 Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
• CPC Class Codes: D06N 3/128 with silicon polymers
• CPC Class Codes: Y10S 428/92 Fire or heat protection feature
• CPC Class Codes: Y10S 428/921 Fire or flameproofing
• CPC Class Codes: Y10T 428/1314 Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]
• CPC Class Codes: Y10T 428/249969 Of silicon-containing material [e.g., glass, etc.]
• CPC Class Codes: Y10T 428/252 Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
• CPC Class Codes: Y10T 428/2962 Silane, silicone or siloxane in coating
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31634 Next to cellulosic
• CPC Class Codes: Y10T 428/31645 : Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31663 : As siloxane, silicone or silane
• CPC Class Codes: Y10T 442/2631 : Coating or impregnation provides heat or fire protection
• CPC Class Codes: Y10T 442/2926 : Coated or impregnated inorganic fiber fabric
• CPC Class Codes: Y10T 442/2992 : Coated or impregnated glass fiber fabric
• CPC Class Codes: Y10T 442/3976 : Including strand which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous composition, water solubility, heat shrinkability, etc.]

Abstract

A flame or heat flux protective coating composition, which includes a dispersion of fiberglass, hollow glass spheres, or a combination of both in silicone. A flame or heat flux protective sheet, which includes hollow glass spheres dispersed in silicone in a sheet form or fiberglass and silicone in a sheet form, wherein the fiberglass is dispersed in the silicone or the fiberglass is a woven cloth coated with the silicone is also presented. Articles incorporating the flame or heat flux protective coating or sheet form and methods for coating an article with the flame or heat flux protective coating composition are also presented.

Claims

1. A flame or heat flux protective coating composition consisting of a dispersion of fiberglass fibers having a length from about 1 mm to about 20 mm and a diameter from about 6 μ

m to about 19 μ

m in silicone and silicone oil, wherein said fiberglass is present in an amount from about 8% to about 12% by weight of the composition, and at least a portion of sizing material has been removed from said fiberglass, wherein the fiberglass fiber length and diameter, and its concentration in the composition, are selected to provide a coating composition that provides a protective coating which promotes effective radiation cooling (emissivity) when exposed to heat, as defined by passing a flame test comprising the steps of;

a) providing a specimen consisting of a vertical steel coupon coated with the above composition;

b) providing an IR sensor mounted to the back side of said specimen 2.54 cm above the bottom edge and at the center across the specimen width;

c) providing a propane torch flame wherein the inner cone length of the flame is adjusted to 3.175 cm;

d) applying for 10 minutes the tip of said inner cone of said flame directly and normal to said specimen'"'"'s coated surface, 2.54 cm above the bottom edge and at the center across the specimen width; and

e) recording the temperature as a function of time detected by said IR sensor to provide a maximum temperature;

wherein a coating is considered to fail said flame test when the maximum temperature exceeds 316°

C.

2. An article comprising at least a portion of a surface coated with the composition of claim 1.

3. The article of claim 2, wherein the surface comprises a material selected from the group consisting of metal, thermoplastics, thermoplastic composites, polyethylene, wood, stone, ceramics, glass, masonry materials, and combinations thereof.

4. The article of claim 2, wherein said article is selected from the group consisting of steel ammunition boxes, railroad ties, plastic piping, lumber, sheet piling, boat hulls, pick-up truck beds, gasoline canisters, fuel tanks in automobiles, airplanes, ships, and submarines, steel skyscraper structures, bridges, areas near high temperature operating components, infrastructure, building support structures, cables in suspension bridges, and high-pressure storage tanks.

5. A method for coating an article with a flame or heat flux protective coating layer comprising applying the composition of claim 1 to at least a portion of said article.