Gypsum wallboard and method of making same

摘要

A coalescing additive is used in the manufacturing process for gypsum wallboard. Such an additive increases the surface area and density of the slurry at the paper to core interface by coalescing the foam cells away from the paper core interface. This permits a stronger paper to core bond to form and increases the compressive strength of the gypsum wallboard as compared to standard wallboards made from slurries with reduced water levels.

主权项

1. A method of manufacturing gypsum wallboard, the method comprising the steps of:
providing a slurry including stucco, paper pulp and water; generating an aqueous foam of foam cells comprising a soap, water and air; adding the aqueous foam to the slurry; adding a coalescing additive to the slurry to coalesce the foam cells, the coalescing additive comprising a polydimethylsiloxane with aminoalkyl and polyether groups emulsion; and depositing the slurry on a facing material to form a gypsum board.