介绍水玻璃粘结剂容易“老化”的原因和老化现象对水玻璃砂性能的危害，提出水玻璃粘结剂改性的方法与应用效果。
This paper introduces the cause of the easy aging of sodium silicate binder and the harm of its aging to the sand nature, and puts forward the methods and effects of sodium silicate binder modifying.
本文简要介绍了叶轮的技术要求，分析了几种原砂、粘结剂的主要特性。
Synopsis: This paper introduces the technical requirements of the impeller and analyses main properties of the kinds of sand and binder.
采用对所研制的粘结剂进行超声波振荡及混砂时加入有机高聚物yppj对铝镁硼复合磷酸盐铸造粘结剂热硬砂进行改性。
The heat cured sand of Al-Mg-B compound phosphate inorganic binder was modified by ultrasonic oscillation to binder and adding organic polymer YPPJ while mixing of sand.
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