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ORGANIC BINDING AGENT FOR CASTING MOLD, AND MOLDING SAND COMPOSITION AND CASTING MOLD OBTAINED BY USING THE SAME
ORGANIC BINDING AGENT FOR CASTING MOLD, AND MOLDING SAND COMPOSITION AND CASTING MOLD OBTAINED BY USING THE SAME
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机译:铸造模具的有机结合剂,以及使用该模具获得的砂型成分和铸造模具
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摘要
PROBLEM TO BE SOLVED: To provide an organic binding agent for a casting mold, which can improve the strength of the casting mold just after gas hardening, and also can satisfactorily secure the usable time in forming a phenol urethane casting mold by the amine cold box method, and further to provide a molding sand composition which can be obtained by using the organic binding agent for the casting mold and has an elongated usable time, and further to provide a casting mold which is formed by hardening the molding sand composition described above by a gas.;SOLUTION: The organic binding agent to be used in forming the phenol urethane gas hardened casting mold is composed of a phenol resin which contains a phenol class monomer of at most 3 %, and has a number average molecular weight (Mn) of 200-700, and satisfies a variance ratio (Mw/Mn) of 1.1-1.6, wherein the variance ratio (Mw/Mn) is the ratio of a weight average molecular weight (Mw) to the number average molecular weight (Mn), in the measurement by the gel filtration chromatography.;COPYRIGHT: (C)2006,JPO&NCIPI
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