METHOD OF MAKING WATER-RESISTANT GYPSUM-BASED ARTICLE

A moisture resistant gypsum-based product, e.g., a gypsum board, is made by adding a small amount of a siloxane to the aqueous slurry used to make the gypsum-based product along with a small amount of a dead burned magnesium oxide catalyst to enhance the curing of the siloxane. In the preferred embo...

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Bibliographische Detailangaben
Hauptverfasser:	VEERAMASUNENI, SRINIVAS, CAPACASA, KATHRYN
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A moisture resistant gypsum-based product, e.g., a gypsum board, is made by adding a small amount of a siloxane to the aqueous slurry used to make the gypsum-based product along with a small amount of a dead burned magnesium oxide catalyst to enhance the curing of the siloxane. In the preferred embodiment, the siloxane is formed into an aqueous emulsion in situ with no chemical emulsifier. L'invention porte sur un produit à base de gypse résistant à l'eau, par exemple une plaque de plâtre, fabriqué par ajout d'une faible quantité de siloxane dans la boue aqueuse afin de fabriquer le produit à base de gypse, ainsi qu'une faible quantité de catalyseur d'oxyde de magnésium grillé à mort afin d'améliorer le durcissement du siloxane. Dans le mode de réalisation préféré, le siloxane est transformé en émulsion aqueuse in situ sans émulsifiant chimique.