鑄型砂用有機粘結劑について（第2報）

概要

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Phenolic resins are commonly used in the practical field as the organic binders for shell molding because of their exccellent properties. But in our country, the cost of phenolic resins is much expensive compared with that of Europe and America. It impedes industrialization very much. The study has been carried out in order to find out the substitute for phenolic resins and urea resins. Rosins and cyclic rubber derivatives were used this time. Urea resin, in general, is comparatively poor in its flow character at heating and requires moisture for condensation. Dimethylol urea, a monomer of the ordinary urea resin, had worse flow character, therefore it could not be used as the binder for shell molding. Contrary to this, the very satisfying result could be obtained with methylated dimethylol urea having a low melting point and good flow character. Both rosins and cyclic rubber derivatives are the thermoplastic resins, but they could be used for this process when they were co-polymerized with phenolic resins and were converted into thermosetting resins. In the case that rosins were used up to the mixing ratio of 1 : 1, relatively good results could be derived. However, the strength of the mold made of cyclic rubber derivatives was inferior. The co-polymer of urea resins and phenolic resins could be applied to this process in every constituent.
Japan Foundry Engineering Societyの論文