LIGHTWEIGHT GYPSUM WALLBOARD

摘要

A lightweight gypsum wallboard having a foamed gypsum core reinforced with pre-gelatinized, e.g., pre-gelled, starch and prepared by mixing an aqueous foam into a gypsum slurry comprising a source of calcined gypsum (commonly known as plaster of Paris), pre-gelled starch and a lignosulfonate dispersant; allowing the so-formed gypsum slurry to set, and then drying the set gypsum core.

主权项

1. A gypsum slurry suitable for producing a lightweight gypsum board comprising an aqueous mixture of calcined gypsum, a pre-gelatinized starch in an amount of more than 4% by weight of the calcined gypsum, and a lignosulfonate dispersant in an amount of at least 0.3% by weight of the calcined gypsum.