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1. 发明授权

US4460629A Process for preparation of resin-coated molding sand 失效
标题翻译：树脂涂层型砂的制备方法
公开(公告)号：US4460629A
公开(公告)日：1984-07-17
申请号：US338038
申请日：1982-01-08
申请人： Tetsuo Haraga , Ryuji Nomura , Isao Kai , Motoyoshi Yamasaki
发明人： Tetsuo Haraga , Ryuji Nomura , Isao Kai , Motoyoshi Yamasaki
IPC分类号： B22C1/22 , B22C9/00 , B05D7/00
CPC分类号： B22C9/00
摘要： The process for preparing a resin-coated casting sand by coating sand grains with a binder comprising a liquid phenolic resin component and a polyisocyanate component, the improvement of which comprises coating sand grains with an organic solvent prior to coating of the sand grains with the binder, thereby prolonging the bench life of the resulting resin-coated casting sand and enhancing the strength of a casting mold prepared from this resin-coated casting sand. Furthermore, this process enables the utilization of sand of a low grade or reclaimed sand having a high alkaline component content, that has not been used in the conventional process, and the supply of an excellent resin-coated casting sand which is capable of providing a casting mold having a high strength and has a long bench life.
摘要翻译：通过用包含液体酚醛树脂组分和多异氰酸酯组分的粘合剂涂覆砂粒来制备树脂涂覆的铸砂的方法，其改进在用粘合剂涂覆砂粒之前用有机溶剂涂覆砂粒从而延长所得树脂涂覆的铸砂的工作寿命，并提高由该树脂涂覆的铸砂制备的铸模的强度。此外，该方法能够利用在常规方法中未使用的具有高碱成分含量的低品位或再生砂的砂，以及提供能够提供具有高强度并具有长工作台寿命的铸模。

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