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Hygroscopicity -resistant mechanism of an α -starch based composite binder for dry sand molds and cores

机译：干砂模具和型芯的α-淀粉基复合粘合剂的抗吸湿机理

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Hygroscopicity-resistance of an α-starch based composite binder for dry sand molds (cores) has been studiedexperimentally and theoretically. Focus is placed on the relationship between the hardening structure andhumidity-resistance of the composite binder. The results show that the α-starch composite binder has goodhumidity-resistance due to its special complex structure. SEM observations illustrate that the composite binder consists ofreticular matrix and a ball- or lump-shaped reinforcement phase, and the specific property of the binding membrane withheterogeneous structure is affected by humidity to a small extent. Based on the analyses on the interplays of differentingredients in the binder at hardening, the structure model and hygroscopicity-resistant mechanisms of the hardeningcomposite binder were further proposed. Moreover, the reasons for good humidity-resistance of the composite binderbonded sand are well explained by the humidity-resistant mechanisms
机译：已经在实验和理论上研究了用于干砂型（芯）的α-淀粉基复合粘合剂的耐吸湿性。着眼于复合粘合剂的硬化结构和耐湿性之间的关系。结果表明，由于其特殊的复杂结构，α-淀粉复合粘合剂具有良好的耐湿性。扫描电镜观察表明，复合粘结剂由网状基质和球形或块状增强相组成，具有异质结构的粘结膜的特殊性能在一定程度上受湿度的影响。在分析硬化过程中粘合剂中不同成分相互作用的基础上，进一步提出了硬化复合粘合剂的结构模型和耐吸湿性机理。此外，复合粘合剂粘结砂具有良好的耐湿性的原因通过耐湿机理得到了很好的解释。

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