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Dialdehyde modified phenolic foundry sand core binder resins, processes for making same, and process for preparing foundry cores and molds employing same
Dialdehyde modified phenolic foundry sand core binder resins, processes for making same, and process for preparing foundry cores and molds employing same
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机译:二醛改性的酚醛铸造砂芯粘合剂树脂,其制备方法以及使用其的铸造芯和模具的制备方法
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摘要
A phenolic resole resin for use as a foundry binder which has been internally modified to reduce its hot strength and thereby enhance its shakeout property is disclosed. The resin is the reaction product of a phenolic compound; a dialdehyde; and formaldehyde. A process of preparing such resin is also disclosed, comprising first reacting the phenolic compound and the dialdehyde, and subsequently reacting the product with the formaldehyde. The resin may be, in a preferred embodiment, an ester- curable alkaline phenolic resin. Also disclosed are a raw batch formulation including the resin of the invention, and foundry articles prepared therefrom.
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