PMMA 8813德固赛---Asia, especially China, is the region with the strongest demand and the highest growth rate of PMMA, and the demand is growing at a double-digit rate. Therefore, most of the future investment will be concentrated in this region, most of which will be located in China. Qimei company in Taiwan plans to build a set of PMMA plant with a capacity of 30000 T / A in Jiangsu Province, and Lucite company plans to build a production unit with a production capacity of no less than 30000 T / A in China. The MMA plant c***tructed by the company in Caojing will be put into operation in 2005. Japan's Keli company is also c***idering to build a set of MMA / PMMA plant in China after 2005. In addition, Sumitomo chemical company of Japan is c***idering the c***truction of the third MMA / PMMA unit.
PMMA成型工艺:
浇铸成型浇铸型用于成型有机玻璃板材、棒材等型材,即用本体聚合方法成型型材。浇铸成型后的制品需要进行后处理,后处理条件是60℃下保温2h, 120℃下保温2h。注塑成型注塑成型采用悬浮聚合所制得的颗粒料,成型在普通的柱塞式或螺杆式注塑机上进行。料筒℃温度后部螺杆式注塑机为180-210度.柱塞式注塑机为175-205度.中部的温度是190-230度,前部螺杆式注塑机为180-210度,柱塞式注塑机为210-240度,喷嘴温度℃螺杆式注塑机为180-210度,柱塞式注塑机为210-240度。
PMMA板材在玻璃化温度以上经定向拉伸,并在拉伸状态下冷却,可以得到分子链处于取向状态的板材,称为定向有机玻璃。定向有机玻璃比之非定向有机玻璃的性能有颇大改善。定向拉伸方法将优质有机玻璃板材加热至105-110℃(稍高于Tg),迅速置于装有固定夹具和水冷却装置的拉伸设备,拉伸至要求的拉伸度后,停止拉伸并保持在拉力下冷却。对于圆形玻璃板,是沿径向多向均匀拉伸;对于方形玻璃板,是沿互相垂直的两个方向拉伸。经拉伸后的有机玻璃板材,分子链沿板材平面方向产生双轴取向并被***。定向有机玻璃性能与未拉伸的有机玻璃板材相比,定向有机玻璃分子链由于变为有序的定向排列,拉伸强度、弯曲强度、抗银纹性、抗裂纹扩展性、模量、断裂伸长率皆提高,冲击强度亦提高。上述各力学性能改善与拉抻度有关,拉伸度增大,性能改善幅度增大,但当拉伸度超过50%-60%后,除冲击强度尚继续有所提高外,其它性能基本上不再变化。因此,一般应将拉伸度控制在60%左右,这时材料具有良好的综合性能。