Hard water foaming agents and methods for gypsum board...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 24/00 (2006.01) C04B 28/14 (2006.01)

Patent

CA 2710626

Compositions and methods for reducing the impact of hard water on gypsum board foaming are provided The compositions include adding a foam to water and a calcined slurry The foam includes water, dispersed air and a surfactant Surfactants for use include a hydrophobic portion having an alkyl chain length distribution of about 20% to about 60% C8 chains, about 20% to about 60% C10 chains, about 14% to about 36% C12 chains and about 2% to about 20% C14 chains and also having a hydrophilic portion having about 0.2 to 3 0 ethoxy groups.

L'invention concerne des compositions et des procédés pour réduire l'impact de l'eau dure sur le moussage des plaques de plâtre. Les compositions comprennent l'ajout d'une mousse à l'eau et une suspension calcinée. La mousse comprend de l'eau, de l'air dispersé et un agent tensioactif. Les agents tensioactifs à utiliser comprennent une partie hydrophobe avec une répartition de longueurs de chaîne alkyle d'environ 20 % à environ 60 % de chaînes de C8, d'environ 20 % à environ 60 % de chaînes de C10, d'environ 14 % à environ 36 % de chaînes de C12 et d'environ 2 % à environ 20 % de chaînes de C14, et également une partie hydrophile avec environ 0,2 à 3,0 groupes éthoxy.

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