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公开(公告)号:US4239665A
公开(公告)日:1980-12-16
申请号:US043759
申请日:1979-05-30
申请人: Alan C. Richards , Riaz A. Khan
发明人: Alan C. Richards , Riaz A. Khan
CPC分类号: C08G8/28 , B22C1/2253 , C08G8/10 , C08L61/14
摘要: Resins for use in making resin-coated granules are made by preparing a novolak resin from a phenol and formaldehyde in the presence of lactose and/or galactose, using an acid catalyst. Melt-coating the resin with an amine curing agent on to particulate refractory material gives resin-coated granules which can be moulded to make foundry moulds. The lactose and/or galactose can replace part of the phenol conventionally employed in preparing novolak resins and avoids the need for plasticizers.
摘要翻译: 用于制备树脂包衣颗粒的树脂通过使用酸催化剂在乳糖和/或半乳糖的存在下由苯酚和甲醛制备酚醛清漆树脂来制备。 将树脂用胺固化剂熔融涂覆在颗粒耐火材料上,得到树脂涂覆的颗粒,可以模塑成型铸造模具。 乳糖和/或半乳糖可以代替常规用于制备酚醛清漆树脂的部分酚,并避免需要增塑剂。