| 摘要 |
PURPOSE:To improve the curing speed, strength, etc. of a casting mold by forming a compd. having >=1 aldehyde groups in a molecule of a saccharide, etc. then subjecting the compd. to the reaction with an acid-setting resin, etc. CONSTITUTION:The saccharide such as glucose and starch are oxidized by using an oxidizing agent such as periodic acid or lead chromate to form the compd. contg. >=1 aldehyde groups having high reactivity in the molecule. Such compd. is mixed with or brought into reaction with the acid-setting resin at 2-50wt% ratio, by which the binder compsn. for a casting mold is obtd. The curing speed of the casting mold is increased by the incorporation of the aldehyde having high reactivity in the binder curing reaction in the stage of molding when such binder is used. The surface stability and strength are further improved.
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