Foundry binder systems which contain alcohol modified...

Details Foundry binder systems which contain alcohol modified... Foundry binder systems which contain alcohol modified...

B - Operations, Transporting

22

C

B22C 1/22 (2006.01) C08G 18/18 (2006.01) C08G 18/54 (2006.01) C08G 18/80 (2006.01)

Patent

CA 2270611

The invention relates to foundry binder systems which use modified polyisocyanates. The modified polyisocyanates are prepared by reacting a polyisocyanate with an aliphatic alcohol having one active hydrogen atom. These modified polyisocyanates, along with a phenolic resole resin, are added to a foundry aggregate to form a foundry mix which is shaped and cured with a gaseous amine curing catalyst.

L'invention concerne des systèmes de liants de fonderie qui utilisent des polyisocyanates modifiés. On prépare lesdits polyisocyanates modifiés en faisant réagir un polyisocyanate avec un alcool aliphatique comportant un atome d'hydrogène actif. On ajoute ces polyisocyanates modifiés, avec une résine de résol phénolique, à un agrégat de fonderie, de façon à former un mélange de fonderie que l'on forme et durcit avec un catalyseur de durcissement gazeux à base d'amines.

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