Improvements in ester cured binders

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 61/14 (2006.01) B22C 1/22 (2006.01) C08K 5/07 (2006.01) C08K 5/315 (2006.01)

Patent

CA 2385839

An embodiment of the present invention provides a method for improving the tensile strength of foundry cores and molds over what may be conventionally achieved. The use of acidic methylene compounds in binder compositions which in-clude strongly alkaline phenolic resoles results in an ester curable binder that may be used to make foundry cores and molds having significantly greater tensile strengths than are achieved with prior art binders. An embodiment of the present invention provides a composition which includes a phenolic resole having a pH ranging from about 10.5 to about 13.5 and an acidic methylene compound.

L'invention porte, selon une réalisation, sur un procédé d'amélioration de la résistance à la traction de noyaux et de moules de fonderie. L'invention porte également sur l'utilisation de composés de méthylène acides dans des compositions de liants qui comprennent des résols phénoliques extrêmement alcalins dans un liant durcissable avec un ester qui peut être utilisé pour fabriquer des noyaux et des moules de fonderie dont la résistance à la traction est bien supérieure à celle des liants de la technique antérieure. Selon une autre réalisation, l'invention porte sur une composition comprenant un résol phénolique dont le pH est compris entre environ 10,5 et environ 13,5 et un composé de méthylène acide.

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