| 摘要 |
PURPOSE:To improve the reconditioning rate of sand by adding a binder, a curing catalyst, and an org. thickener to a refractory material and kneading the same thereby making the same usable for producing a casting mold by a sweeping mold or strickle. CONSTITUTION:A binder consisting at least one kind among a furan resin, a phenolic resin and a urea resin, a curing catalyst consisting of an inorg. or org. acid and an org. thickener e.g. hydroxypropyl cellulose or methyl cellulose or the like are added to a refractory material such as silica sand and the mixture is kneaded. The proportion of the thickener, i.e. hydroxypropyl cellulose is 0.9- 1.4pts.wt. basing on 100pts.wt. refractory material. |
