Intumescent powder
AssigneePyrophobic Systems, Ltd.
InventorsKevin B. Langille, Dat T. Nguyen, Dwight E. Veinot, Jorgen O. Bernt
Life of this patent
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Abstract
An intumescent powder where the molar ratio of SiO2 to Li2O+Na2O+K2O is between 2.20 to 3.70 to 1.00 and the molar ratio of Li2O to Li2O+Na2O+K2O is 0.20 to 0.35 has an intumescent point of 195° C. or higher and thus will not prematurely intumesce if mixed with another material at temperatures below 195° C. The powder as used is usually dried to 8-12% by weight to moisture for most purposes is ground to 50 to −500 microns. Preferred methods of manufacture comprise taking a source of lithium hydroxide or lithium silicate and a source of sodium silicate to create a powder with ratios as outlined above.
Claims16
Intumescent powder substantially defined by molar ratios (2.20 to 3.70) SiO2/(0.20 to 0.35) Li2O:
- (0.65 to 0.80)(Na2O+K2O) where the coefficients of Li2O on the one hand and of (Na2O+K2O) on the other total 1:00 where the molar ratios are accurate to within plus or minus 2%.
Method of forming an intumescent powder comprising mixing a source for lithium hydroxide or lithium silicate with sodium silicate in quantities to achieve a molar ratio of about (2.20 to 3.70) SiO2/(0.20 to 0.35)Li2O:(0.80 to 0.65)(Na2O+K2O), where the coefficients of Li2O and (Na2O+K2O) add to 1.00 and the molar ratios are accurate to plus or minus 2%;
- and water, and drying the moisture and water to 8-12% by weight, of water.
Method of forming an intumescent powder comprising mixing sodium and/or potassium silicate, and lithium silicate with water added if necessary to lower the viscosity, ground to produce (2.20 to 3.70) SiO2/(0.20 to 0.35) Li2O:
- (0.80 to 0.65)(Na2O+K2O) where the coefficients of Li2O and (Na2O+K2O) are chosen so the sum of the coefficients equals 1.00, and where the molar ratios are accurate to plus or minus 2%;
- dried to a moisture content of 8° to 12° and ground to 50 to 500 microns.
Dependencies are inferred from the claim text.