鋳型砂用有機粘結材について（第4報）
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概要
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In recent years, the utilization of synthetic resins for the binders of molding sand becomes prevailing in Japan. The feature of the application of these materials is the thermosetting properties, so that the thermosetting resins are exclusively used. Consequently, the mold should be hardened by heating. This experiment was carried out so as to harden the mold at room temperature by using polyester resins, whose inherent character is the "room temperature hardening property". In this process, the curing of mold can be made at room temperaure, and this results in the possibilities of making the shell molds from a wooden pattern. The experimental results are as follows : 1. Usually, the amount of resins in sand mold are relatively small (a few per cent of sand weight), the exothermic reaction of hardening of polyester resins is prevented by the adsorption of heat by sand grains. Owing to this reason, the rate of hardening of sand mold is lowered rapidly when the temperature of atmosphere is below 30°C. 2. As a catalyst of room temperature hardening, methyl ethyl ketone peroxide (Lupersol DDM) is used. In this case, the maximum rate of hardening is obtained at 30°C. Whether the temperature of atmosphere is higher or lower than 30°C, the strength of the sand mold is inferior. 3. Relatively higher percentages of DDM catalyst and cobalt naphthanate promoter are necessary for this process than those are ordinarily used. The best result is obtained by the addition of 3 to 7 per cent of DDM catalyst and 0.75 per cent cobalt promoter. 4. For high temperature hardening, the benzoyl peroxide (B. P. O.) catalyst is used, and good results are obtained by hardening the mold at 200°C. 5. The penetration test is made by pouring the gray iron into this new mold. In the case of B. P. O. and DDM catalyst are used, good results as well as the mold made from phenolic resins are obtained.
- Japan Foundry Engineering Societyの論文
Japan Foundry Engineering Society | 論文
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