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发明公开
CN103910507A 耐高温多层覆膜砂制备方法 无效 - 驳回

耐高温多层覆膜砂制备方法
摘要：
本发明提供一种耐高温多层覆膜砂制备方法，该制备方法按如下步骤进行：a.将经过筛分的石英砂或陶粒在高温炉中加热至150～180℃后置入一级混砂机中，搅拌下先喷入覆膜材料，搅拌10～20s后，再加入固化剂，继续搅拌90～240s，得预固化覆膜石英砂或陶粒；b.将a步骤的预固化覆膜石英砂或陶粒置入二级混砂机中加热至150～180℃，搅拌下喷入不饱和树脂、有机硅和固化剂，搅拌40～140s，得可固化覆膜石英砂或陶粒；c.将b步骤的可固化覆膜石英砂或陶粒冷却至100～110℃后置入第三级混砂机中，加入惰性树脂重量5～7%的硬脂酸钙并搅拌均匀，得产品入库。
摘要（英）：

The invention provides a preparation method of a high-temperature resistance multilayer precoated sand, which comprises the following steps: a)heating screened quartz sand or ceramsite in a high-temperature furnace to 150-180 DEG C and then placing in a first-grade sand mixer, injecting a coated material while stirring, adding a curing agent after stirring for 10-20 seconds, continuously stirring for 90-240 seconds to obtain the precured coated quartz sand or ceramsite; b)placing the precured quartz sand or ceramsite in the step a) in a secondary sand mixer for heating to the temperature of 150-180 DEG C, injecting nonsaturated resin, organosilicon and the curing agent while stirring, stirring for 40-140 seconds to obtain the solidifiable coated quartz sand or ceramsite; and c)cooling the solidifiable coated quartz sand or ceramsite in the step b) to the temperature of 100-110 DEG C and placing in a third-grade sand mixer, adding calcium stearate with inertia resin weight of 5-7%, and uniformly stirring to obtain the product for warehousing.

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