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研究聚氯乙烯塑料固化物的热稳定性,不仅对评价其固化工艺过程的安全性是必需的,而且可以提供固化物热老化行为的有用信息。据报道~([1]),在有氧存在时加热聚氯乙烯树脂,将同时发生热分解脱氯化氢、氧化断链与交联以及芳构化等多种化学反应,其中最主要的反应是热分解脱氯化氢。因此,可用衡量热分解快慢和难易的指标来评定聚氯乙烯塑料的热稳定性。本实验初步测定了聚氯乙烯塑料固化物的热分解性能。所用样品是以废弃的54—06塑料地板为固化剂,对焚烧炉炉灰和过滤材料等类废物(在Φ45螺杆挤压机上)进行了固化处理后得到的模拟固化物~([2])。实验中还比较了聚氯乙烯固化物在辐照前后热分解性能的变化。
Studying the thermal stability of PVC plastic cured products is not only necessary to evaluate the safety of the curing process, but also provide useful information on the thermal aging behavior of cured products. It has been reported ~ ([1]) that when heated in the presence of oxygen, the polyvinyl chloride resin will undergo simultaneous thermal decomposition of dehydrochlorination, oxidative chain scission and cross-linking, and aromatization and many other chemical reactions, the most important being Thermal decomposition of dehydrochlorination. Therefore, the thermal stability of PVC can be evaluated by measuring the index of thermal decomposition speed and difficulty. The experiment initially determined the thermal decomposition performance of PVC plastic cured material. The samples used were the simulated hardened material ~ ([2]) obtained after the solidified waste of 54-06 plastic floor was hardened by the treatment of ash, filter material and other wastes of incinerator (on the Φ45 screw extruder) . The experiment also compared the thermal decomposition properties of PVC cured before and after irradiation.