Gypsum product

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C - Chemistry, Metallurgy

04

B

261/2, 134/44, 2

C04B 38/10 (2006.01) C04B 24/08 (2006.01) C04B 24/22 (2006.01) C04B 40/00 (2006.01) C08L 91/06 (2006.01)

Patent

CA 2317600

A wax emulsion comprising an emulsifying system containing a sulphated anionic surfactant and a non ionic surfactant having high water solubility (cloud point) and high foaming ability is added to a gypsum slurry to improve the moisture resistance of gypsum board. The wax is a mixture of a petroleum derived hydrocarbon wax and a montan wax.

Une émulsion de cire comprenant un système émulsifiant contenant un tensioactif anionique sulfaté et un tensioactif non ionique présentant une solubilité dans l'eau (point de trouble) élevée et une aptitude au moussage élevée est ajoutée à une pâte de plâtre pour améliorer la résistance à l'humidité du placoplâtre. La cire est un mélange d'une cire d'hydrocarbure dérivé du pétrole et d'une cire de lignite.

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