Intumescent powder compositions and coatings made therefrom

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/18 (2006.01) C08K 5/49 (2006.01) C09K 21/04 (2006.01) C09K 21/14 (2006.01)

Patent

CA 2532402

The present invention provides intumescent powder compositions and methods of using them, the compositions comprising one or more blowing agents that initiate blowing at a first initiation temperature, preferably tetrazoles, one or more phosphorous containing catalysts that act as a blowing agent at a second initiation temperature, one or more hydroxyl functional or epoxy functional thermosetting resin carbonifics, one or more heterocycle containing thermoplastic resin or (co)polymer carbonifics, and one or more low temperature curing agents, such as an imidazole, wherein the compositions initiate blowing at a first and a at second initiation temperature which temperatures differ from each other by 10°C or more and by up to 150°C. The compositions do not foam during cure and provide cured intumescent coatings on substrates, such as structural steel, exhibiting controlled foaming when exposed to fire. In another embodiment, the present invention provides plastic, capstock or molding compounds comprising one or more moldable or shapeable (co)polymers or resins, preferably polypropylene, and intumescent compositions.

La présente invention concerne des compositions de poudre intumescentes et leurs méthodes d'utilisation, lesdites compositions comprenant un ou plusieurs agents gonflants qui amorcent le gonflement à une première température d'amorce, de préférence des pentétrazoles, un ou plusieurs catalyseurs contenant du phosphore qui agissent comme agent gonflant à une deuxième température d'amorce, un ou plusieurs carbonifiques de résine thermodurcissable à fonctions hydroxyle ou époxy, un ou plusieurs hétérocycles contenant de la résine thermoplastique ou des carbonifiques de copolymères, les compositions amorçant le gonflement aux première et deuxième températures d'amorce, lesdites températures différant l'une de l'autre de 10 °C ou plus et jusqu'à 150 °C. Les compositions ne moussent pas pendant le séchage et forment des revêtements intumescents sur des substrats, tels que l'acier structurel, produisant une mousse contrôlée quand ils sont exposés au feu. Dans un autre mode de réalisation, la présente invention concerne des composés de plastique, de capstock ou de moulage comprenant un ou plusieurs copolymères ou résines moulables ou formables, de préférence du polypropylène, et des compositions intumescentes.

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