METHOD OF MAKING A CONDENSED ALUMINIUM PHOSPHATE

摘要

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 DEG C. for longer than about 2 hours and then raising the temperature in stages to at least about 400 DEG C. so as to minimize foaming and to avoid any liquefaction of the mixture during the reaction.