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塑料的品种日益增多,应用也越来越广泛。目前最普遍的一种,就是聚氯乙稀塑料。聚氯乙稀塑料随着使用时间的延续,颜色就会发生改变。这是为什么呢?
The variety of plastics is increasing and applications are becoming more and more extensive. The most common one at present is polyvinyl chloride plastic. With the continuation of the use of polyvinyl chloride plastic, the color will change. Why is this?