Intumescent material

C - Chemistry – Metallurgy – 23 – F

Patent

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Details

C23F 11/18 (2006.01) C09K 21/02 (2006.01) C09K 21/14 (2006.01)

Patent

CA 2289372

An intumescent material includes a liquid carrier with a corrosion inhibitor, such as a coating forming material, expandable particulate graphite (flake graphite or lump graphite) and if desired a filler. The intumescent material has a pH greater than 7.0, to reduce the corrosive properties of the intumescent material for most metals used in the construction industry and to provide a chemical environment conducive to the forming of a corrosion inhibiting layer by the corrosion inhibitor. The method of making the intumescent material includes combining the liquid carrier, the corrosion inhibitor, the expandable particulate graphite, the filler (if used), and a pH enhancer (if necessary to bring the intumescent material within the desired pH range), to form an intumescent material having a pH greater than 7Ø

Un matériau intumescent comprend un support liquide avec un inhibiteur de corrosion, tel qu'un matériau formant un revêtement, du graphite extensible à particules (graphite lamellaire ou graphite en blocs) et, si désiré, une charge. Le matériau intumescent a un pH supérieur à 7,0, afin de réduire les propriétés corrosives du matériau intumescent pour la plupart des métaux utilisés dans l'industrie de la construction et procurer un environnement chimique favorable à la formation d'une couche inhibant la corrosion par l'inhibiteur de corrosion. Le procédé de fabrication du matériau intumescent comprend la combinaison du support liquide, de l'inhibiteur de corrosion, du graphite extensible à particules, de la charge (si utilisée), et d'un rehausseur de pH (si nécessaire pour que le matériau intumescent soit dans la gamme de pH souhaitée), pour former un matériau intumescent ayant un pH supérieur à 7,0.

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