초록 ▼

For the conversion of sodium tetraborate (e.g. “5 mole borax”or sodium tetraborate pentahydrate) to a solid, particulate mass of flame-retardant chemical, a slurrying amount of water (e.g. 3-5 moles per mole of tetraborate) is first added, so that a stable slurry can be formed. Then 0.95 to 0.98 mol

For the conversion of sodium tetraborate (e.g. “5 mole borax”or sodium tetraborate pentahydrate) to a solid, particulate mass of flame-retardant chemical, a slurrying amount of water (e.g. 3-5 moles per mole of tetraborate) is first added, so that a stable slurry can be formed. Then 0.95 to 0.98 mole of sulfuric acid is added to the slurry, and the tetraborate is substantially converted to a moist, particulate mixture of boric acid and sodium sulfate, the water in the slurry having been largely driven off as steam. The moist particulate mixture is suitable for imparting flame retardency to cellulosic insulation; preferably, however, it is first dried to <20 wt.-% moisture.

대표청구항 ▼

A method for converting sodium tetraborate to a solid, particulate fire retardant mixture containing solid, particulate boric acid and sodium sulfate, said method comprising the steps of: a. adding a slurrying amount of water to said sodium tetraborate, said slurrying amount being sufficient to susp

A method for converting sodium tetraborate to a solid, particulate fire retardant mixture containing solid, particulate boric acid and sodium sulfate, said method comprising the steps of: a. adding a slurrying amount of water to said sodium tetraborate, said slurrying amount being sufficient to suspend substantially -3 U.S. mesh particles of sodium tetraborate in a uniform slurry comprising a continuous aqueous suspension medium but not sufficient to completely dissolve said sodium tetraborate, said amount of water being less than about 15 moles per mole of sodium tetraborate; b. agitating the undissolved particles of sodium tetraborate so as to form a uniform aqueous slurry of said particles; c. adding to said aqueous slurry about 0.95 to about 0.98 moles of sulfuric acid per mole of said sodium tetraborate, thereby obtaining said fire retardant mixture, and permitting the resulting exotherm to drive off sufficient water vapor from said continuous aqueous suspension medium to convert said medium to a moisture residue on discrete particles of said fire retardant mixture.