摘要
本文研究了ABS塑料片材和冷却塔部件的耐湿热老化性能。发现ABS塑料在常温水中基本无性能变化 ,升高温度则变化加剧 ,产生颜色变深、力学性能变坏等一系列老化现象。在热水老化中ABS塑料更多地发生高分子断裂 ,生成极性基团和低分子物 ,使之性能变化加剧 ,拉伸和冲击强度呈L型连续下降曲线 ;而在湿热空气老化试验的中后期则更多地形成高分子交联结构 ,使性能变化减缓 ,强度有所回升。因此ABS塑料属于“湿度促进老化类型”。提出以经过热水老化后的ABS塑料湿态试样的拉伸及冲击强度性能项目来评判它的耐湿热老化性能 ,确定了试验条件和性能合格指标 ,已采用在有关的专业标准之中。
The property of ABS sheet and cooling tower parts with damp & heat aging has been studied. It is showed that the properties are not changed in normal temperature water. The change of property is accelerated with raising temperature. A series of aging phenomenon of which color of ABS sheet changes to dark and the properties go bad has taken place. Macromolecule is broken more easily. Polar group and low molecule has been produced. The tensile strength and impact strength is continuously fallen with L curve. Macromolecular cross-link has been formed much more during the middle and later period of damp & heat air aging. The change of property is slowed down and the strength has gone up again. ABS plastics are belong to the one of which humidity can accelerate the aging. It is suggested that the tensile strength and impact strength of wet ABS sample through hot water aging may be used to judge its damp & heat aging properties. The test condition and qualified target has been determined and be used in related specialized standard.
出处
《上海第二工业大学学报》
2000年第1期14-20,共7页
Journal of Shanghai Polytechnic University
关键词
ABS塑料
湿热
老化
ABS plastics
damp & heat
aging
