Low density drywall

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 13/14 (2006.01) E04C 2/04 (2006.01)

Patent

CA 2661937

A thin drywall board that includes a gel coat, at least one polymer/gypsum layer, and a wet glass fiber layer is provided. The gel coat is formed of a gel coat composition that includes a water dispersible polymer, gypsum, and optionally a crosslinking agent and/or a coupling agent. The polymer/gypsum layer is formed of a matrix composition that includes a water dispersible polymeric resin and gypsum. Components including melamine formaldehyde, a filler material, coupling agents, acetic acid, an accelerator, and/or a hardener may also be added to the matrix composition. The wet glass fiber layer is preferably a glass fiber mat. The combination of the water dispersible polymeric resin and the gypsum in the matrix composition have a synergistic effect that creates a thin drywall board that is water resistant, fire resistant, and has improved mechanical properties. A method of forming the inventive thin drywall boards is also provided.

Panneau de cloison sèche mince comprenant un revêtement de gel, au moins une couche de polymère/gypse et une couche en fibre de verre humide. Le revêtement est en composition de revêtement de gel qui comprend un polymère hydrodispersable, du gypse et éventuellement un agent de réticulation et/ou un agent de couplage. La couche de polymère/gypse est en composition matricielle comprenant une résine polymère hydrodispersable et gypse. On peut aussi ajouter à cette composition matricielle des composants incluant du formaldéhyde de mélamine, un agent de remplissage, des agents de couplage, de l'acide acétique, un accélérateur et/ou un durcisseur. De préférence, la couche de fibre de verre humide est un mât en fibre de verre. La combinaison de résine polymère dispersable dans l'eau et de gypse dans la composition matricielle a un effet de synergie qui donne un panneau de cloison sèche mince résistant à l'eau et au feu, et possède des propriétés mécaniques améliorées. Également, procédé de formation de panneau de cloison sèche.

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