Method for manufacturing water glass cement hardeners
AssigneePennwalt Corporation
InventorsKurt Goltz, William T. West
Life of this patent
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Abstract
Condensed aluminum phosphates, useful as hardeners for water glass cements, are prepared in a solid state reaction by dry mixing aluminum hydroxide with an ammonium phosphate, heating the mixture at an initial temperature below 250.degree. C. for longer than about 2 hours and then raising the temperature in stages to at least about 400.degree. C. so as to minimize foaming and to avoid any liquefaction of the mixture during the reaction.
Claims12
A method of making a condensed aluminum phosphate comprising dry mixing aluminum hydroxide with an ammonium phosphate and heating the mixture at an initial temperature which is sufficient to decompose the ammonium phosphate but below about 250.degree. C. for longer than about two hours and then raising the temperature in stages so as to form by a solid state reaction a condensed aluminum phosphate which is useful as a hardener for water glass cements the X-ray diffraction pattern of said condensed aluminum phosphate showing a high peak at 2.theta.=61.1.degree., but not showing a peak at 2.theta.=11.2.degree..
Dependencies are inferred from the claim text.