Gypsum plaster

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

261/77, 261/79,

C04B 28/14 (2006.01) C04B 14/10 (2006.01) C04B 14/32 (2006.01) C04B 24/26 (2006.01) C04B 24/38 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2329424

An extrudable gypsum plaster paste is disclosed comprising: .alpha. gypsum plaster; water in a substantially stoichiometric amount; a binder; and a clay or another rheology modifier functionally equivalent to a clay. Such pastes can have a yield stress sufficient to make the paste self supporting. The invention also provides a method for making an extrudable gypsum plaster paste comprising: mixing .alpha. gypsum plaster, water in a substantially stoichiometric amount and a binder; and mixing into that mixture a clay or other rheology modifier functionally equivalent to a clay.

L'invention concerne une pâte de plâtre à gypse extrudable renfermant un plâtre à gypse .alpha., de l'eau dans une quantité sensiblement stoechiométrique, un liant, et une argile ou un autre modificateur rhéologique dont la fonction est analogue à celle d'une argile. De telles pâtes peuvent présenter une limite d'élasticité apparente suffisante pour faire en sorte que la pâte s'autosupporte. L'invention concerne également un procédé de fabrication d'une pâte de plâtre à gypse extrudable consistant à mélanger le plâtre à gypse .alpha., l'eau dans une quantité sensiblement stoechiométrique et un liant, puis à ajouter au mélange une argile ou tout autre modificateur rhéologique dont la fonction est analogue à celle d'une argile.

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