过去化学硬化法所使用的粘结剂单纯是水玻璃,其强度与表面强度在模数2时最为适宜;即使如此通气时间比较长,崩溃性亦差.因而加入适当的添加剂改进水玻璃的性能是很必需的,所以用各种有机材料进行了试验,其中糖浆价格最便宜并能改进水玻璃的性能.此外,对淀粉亦同样的进行了试验. In the past, the binder used in the chemical hardening method was purely water glass, and its strength and surface strength were the most suitable at a modulus of 2, even though the aeration time was long and the crushing property was poor, thereby adding appropriate additives to improve the performance of the water glass So it is necessary to use a variety of organic materials were tested, including the cheapest syrup price and can improve the performance of sodium silicate. In addition, the starch was also tested.