不饱和聚酯树脂增稠特性和固化行为的研究

STUDY ON THICKENING CHARACTERISTICS AND CURING BEHAVIOR OF UNSATURATED POLYESTER RESIN

以氧化镁、氢氧化钙增稠不饱和聚酯（UP）树脂，通过测定树脂糊初期和后期的粘度及固化反应曲线，对影响增稠特性的几个重要因素和固化行为进行了研究。结果表明，氧化镁比氢氧化钙的增稠效果好，适宜用量为2～4份；增稠温度40℃较为适中；微量水促进初期增稠，但对最终粘度影响不明显；氧化镁与氢氧化钙复配增稠体系中，氢氧化钙能抑制初期增稠，而促进后期增稠；随增稠剂含量增加，增稠后树脂糊固化反应的峰顶温度升高，放热量减小；由不同升温速率的固化曲线可以确定凝胶温度、固化温度、后处理温度等工艺条件。

Unsaturated polyester （UP） resin was thickened by magnesium oxide （MgO） and calcium hydroxide [Ca（OH）2]. Several important factors affecting thickening characteristics and curing behavior were studied by measuring the viscosity of the paste at initial stage and later stage as well as the curing curves. The results indicated that MgO had a better effect than Ca（OH）2 on UP thickening, and the suitable dosage was 2 - 4 phr. The moderate thickening temperature was 40℃; micro-water accelerated initial thickening, but no evident effect on final viscosity; Ca（OH）2 could hold initial thickening, but promote later thiekening in the MgO, Ca（OH）2 combined thickening system; the increasing contents of thickening agents would result in higher peak temperature and less quantity of heat in the curing of after-thlckening paste; we could also educe the gel temperature, curing temperature and post-curing temperature in the crafts from curing curves at different dynamic scans.