石膏具有水化胶凝特性。为了获得优质铸件,铸造用石膏必须具有标准调度加水量少、强度建立快、强度高、胶凝时间适当等特点。 目前市场供应的α型高强石膏主要存在两个问题:一是石膏浆体的标稠加水量、胶凝时间及硬化体的强度不稳定;二是石膏硬化体的强度低、强度建立慢。 Gypsum has hydration gelling properties. In order to obtain high-quality castings, the cast gypsum must have the characteristics of a standard schedule of adding less water, faster strength establishment, higher strength and proper gelling time. The currently available α-type high-strength gypsum has two main problems: First, the gypsum slurry standard thick water, gel time and the strength of the hardened body instability; the second is the strength of gypsum hardened body, the strength to establish a slow.