Fire protective composition and method for impregnating...

B - Operations – Transporting – 27 – K

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B27K 3/52 (2006.01) C09K 15/22 (2006.01) C09K 21/10 (2006.01) D06M 11/71 (2006.01) D06M 11/72 (2006.01) D06M 13/322 (2006.01) D06M 13/453 (2006.01) D21H 17/07 (2006.01) D21H 21/34 (2006.01)

Patent

CA 2245626

Fire- and smoke-inhibiting aqueous composition and a method for a one-step impregnation of aqueous-absorbable, and normally inflammable materials, such as wood, paper and textiles, said composition comprising ammoniumphosphates, phosphoric acid, water soluble metal salts with the ability to form water insoluble salts with phosphate ions and/or ammoniumphosphate ions, and other optional additives. The composition comprises in combination: 0.5-90 % by weight monoammoniumphosphate and/or diammoniumphosphate, 0.1-30 % water soluble metal salts with the ability to form water insoluble salts with phosphate ions and/or ammoniumphosphate, 1-20 % by weight acid especially phosphoric acid (85 %), 1-15 % by weight dicyandiamide, and optionally up to 5 % by weight additives in a total concentration of from 1 to 50 % by weight with respect to the total weight of the aqueous solution, whereby phosphoric acid and dicyandiamide are present in the form of the reaction product guanylureaphosphate.

L'invention concerne une composition aqueuse ignifuge empêchant la formation de fumée et un procédé d'imprégnation en une étape de matières susceptibles d'absorber de l'eau - et normalement inflammables, telles que du bois, du papier et des textiles, ladite composition renfermant des phosphates d'ammonium, de l'acide phosphorique, des sels métalliques solubles dans l'eau capables de former des sels insolubles dans l'eau avec des ions phosphate et/ou des ions phosphate d'ammonium, ainsi que d'autres additifs éventuels. Cette composition renferme une combinaison de: 0,5-90 % en poids de phosphate mono-ammonique et/ou de phosphate diammonique; 0,1-30 % de sels métalliques solubles dans l'eau capables de former des sels insolubles dans l'eau avec des ions phosphate et/ou des ions phosphate d'ammonium; 1-20 % en poids d'acide, particulièrement d'acide phosphorique (85%); 1-15 % en poids de dicyanodiamide et éventuellement jusqu'à 5 % en poids d'additifs; l'ensemble de ces composants est présent dans une concentration comprise entre 1 et 50 % en poids par rapport au poids total de la solution aqueuse; l'acide phosphorique et le dicyanodiamide étant présents sous forme du produit de réaction phosphate de guanylurée.

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