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由于PVC本身的热稳定性不是很好,如果不采取保护措施,它在被加热时将通过一种自催化的反应过程分解而生成氯化氢,因此需加入热稳定剂来加以保护。热稳定剂对于改善PVC的可加工性起着关键的作用,它可以除掉烯丙型氯化结构(这种结构是导致氯化氢形成的一个关键的中间步骤),从而打乱这个分解过程,使PVC能够被加热至熔融状态后加工成各种产品。稳定剂的成分相当复杂,常常含有金属盐类,如硫酸盐、碳酸盐、硬脂酸盐和月桂酸盐等。为了可以产生真正的协同效果,稳定剂常常以组合的形式加入,
Because the thermal stability of PVC itself is not very good, if it does not take protective measures, it will be decomposed through an autocatalytic reaction process to generate hydrogen chloride when heated, so it needs to be added to protect the thermal stabilizer. Heat stabilizers play a key role in improving the processability of PVC. They can remove allylic chlorinated structures (this structure is a key intermediate step leading to the formation of hydrogen chloride), thereby disrupting the decomposition process and making PVC can be heated to a molten state and processed into various products. The composition of stabilizers is quite complex and often contains metal salts such as sulfates, carbonates, stearates, and laurates. In order to produce a truly synergistic effect, stabilizers are often added in combination.