Process for the continuous synthesis of a liquid melamine resin

C - Chemistry – Metallurgy – 08 – G

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C08G 12/32 (2006.01) C08G 73/06 (2006.01)

Patent

CA 2518826

The invention relates to a method for synthesising a liquid melamine resin, characterised in that: a) melamine, at least one aldehyde and at least one alcohol are fed to at least one first reactor (10) operated continuously, in particular at least one agitated tank operated continuously and are reacted together, b) the reaction product that is obtained is fed to a solid-liquid phase separation device (11), c) a solid-rich phase (A) that has been produced in the solid-liquid phase separation (11) is fed back to at least one first reactor (10) and d) a phase (B) devoid of solids that has been produced in the solid-liquid phase separation (11) is subjected to additional processing steps. The invention thus provides an efficient continuous direct synthesis method.

L'invention concerne un procédé de synthèse d'une résine liquide de mélamine, caractérisé en ce qu'il consiste : a) à introduire de la mélamine, au moins un aldéhyde et au moins un alcool dans au moins un premier réacteur à fonctionnement continu (10), en particulier dans au moins une cuve malaxeuse à fonctionnement continu, et à engendrer leur réaction ; b) à introduire le produit réactionnel résultant dans un dispositif de séparation de phase solide-liquide (11) ; c) à réintroduire une phase riche en substances solides (A) qui résulte du processus de séparation de phase solide-liquide effectué dans ledit dispositif (11), au moins dans le premier réacteur (10), et ; à soumettre une phase pauvre en substances solides (B) qui résulte du processus de séparation de phase solide-liquide réalisé dans ledit dispositif (11) à d'autres étapes de traitement. Ainsi, cette invention permet de mettre en oeuvre un procédé efficace de synthèse directe en continu.

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