Aluminum phosphates, compositions comprising aluminum phosphate, and methods for making the same

摘要

APs are made by binary condensation via base-to-acid or acid-to-base routes. In the base-to-acid route, an aluminum hydroxide slurry is added to phosphoric acid that reacts to produce an aluminum phosphate condensate. In the acid-to-base route, phosphoric acid is added to an aluminum hydroxide slurry that reacts to produce an aluminum phosphate condensate. In an alternative base-to-acid route, an acidic aluminum phosphate is first made by adding phosphoric acid to a first amount of aluminum hydroxide slurry, and such acidic aluminum phosphate is added to a remaining amount of aluminum hydroxide slurry to react and produce an aluminum phosphate condensate. The reactions can be controlled to form an in-situ layered aluminum phosphate. So-formed APs can be amorphous, crystalline, or a combination thereof, and have low oil absorption and surface area, making them particularly useful in such end-use applications as extender pigments in coating compositions, replacing up to 70 wt % of TiO2.

主权项

1. A method for making solid amorphous aluminum phosphate particles by condensation reaction comprising the steps of:
combining ingredients consisting of an aluminum hydroxide slurry containing aluminum hydroxide in water, and phosphoric acid to form a mixture; and reacting the mixture for a period of time to form a reaction product consisting of a dispersion of solid aluminum phosphate particles in water, wherein the solid aluminum phosphate particles comprise amorphous aluminum phosphate.