Composition of matter and method of application for...

B - Operations – Transporting – 22 – C

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B22C 1/20 (2006.01) B22C 5/00 (2006.01)

Patent

CA 2652485

A formulation and method of use for eliminating the use of hexa in shell sand encapsulation is disclosed. The composition of matter consists of standard novalac resins with the hexa component replaced by solid granular resole or curing agent. The preferred formulation and method of compounding is given. Trace elements of ammonia, phenol and the like are further reduced by the addition of a preferred 50:50 mix of an ammonia buffer and masking agent. The preferred compounds for the ammonia buffer and masking agent mix is given.

L'invention concerne une formulation et un procédé d'utilisation destinés à éliminer l'utilisation d'hexaméthylènetétramine pour l'encapsulation de sable de moulage en carapace. La composition selon l'invention comprend des résines novalac standard, le composant hexa étant remplacé par un résol granulaire solide ou un agent de polymérisation. La formulation préférée et le procédé de mélangeage préféré sont présentés. Des éléments traces d'ammoniac, de phénol et similaire sont en outre réduits par addition d'un mélange préféré 50/50 constitué d'un tampon d'ammoniac et d'un agent masquant. Les composés préférés pour le mélange à base du tampon d'ammoniac et de l'agent masquant sont donnés.

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