Fireproofing agent for particle or fibre boards

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 21/04 (2006.01) A62D 1/00 (2006.01) B27K 3/32 (2006.01) B27N 9/00 (2006.01) C09K 21/02 (2006.01) D21J 1/08 (2006.01) E04C 2/16 (2006.01) E04F 19/02 (2006.01)

Patent

CA 2256398

The invention concerns a fireproofing agent which can be applied to boards or shaped parts of particles or fibres, obtained from wood or components of annual plants, in order to render them fireproof. The fireproofing agent according to the invention contains between 65 and 85, preferably 74, parts by weight ammonium sulphate, between 10 and 25, preferably 19, parts by weight borax and between 4 and 10, preferably 7, parts by weight trisodiumphosphate. In addition, between 0.5 and 2 parts by weight, preferably 1 part by weight, sodium metasilicate can be added. The invention further concerns a method of fireproofing boards or shaped parts of this type. According to this method, the particles or fibres are first impregnated with a solution of the fireproofing agent according to the invention, are then dried to a moisture content of between approximately 1 % and approximately 12 %, preferably between 1 and 4 %, are subsequently glued with a binder, combined to form pressed mats, and finally compressed to form boards or shaped parts.

L'invention concerne un agent de protection contre les incendies permettant de conférer des propriétés ignifuges à des panneaux ou à des pièces moulées en copeaux ou en fibres, d'origine ligneuse ou provenant de plantes annuelles. Cet agent de protection contre les incendies contient entre 65 et 85, de préférence 74 parties en poids de sulfate d'ammonium, entre 10 et 25, de préférence 19 parties en poids de borax et entre 4 et 10, de préférence 7 parties en poids de phosphate trisodique. Il est possible d'ajouter au mélange entre 0,5 et 2 parties en poids, de préférence 1, de métasilicate sodique. L'invention concerne en outre un procédé permettant de rendre de tels panneaux ou de telles pièces moulées ignifuges. Selon ce procédé, les copeaux ou les fibres sont d'abord imprégnés avec une solution de l'agent de protection contre les incendies proposé, puis sont séchés jusqu'à ce que leur teneur en humidité soit comprise entre approximativement 1 et approximativement 12 %, de préférence entre 1 et 4 %, avant d'être encollés avec un liant, d'être assemblés pour former un non-tissé obtenu par compression, puis pour finir, d'être comprimés pour former des panneaux ou des pièces moulées.

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