废旧塑料制品在使用过程中由于受到外界条件的影响及光和热的作用，已有不同程度的老化，其中所含各种添加剂均有不同程度的损失，例如回收的废旧软质聚氯乙烯中增塑剂损失就较大，用它生产再生制品，其性能远比用新料生产的制品差。为尽可能提高再生制品的质量，在再制过程中有必要重新添加一定量的助剂，以改进废旧塑料的成型加工，机械、热和电等性能。
废旧塑料制品在使用过程中由于受到外界条件的影响及光和热的作用，已有不同程度的老化，其中所含各种添加剂均有不同程度的损失，例如回收的废旧软质聚氯乙烯中增塑剂损失就较大，用它生产再生制品，其性能远比用新料生产的制品差。 As far as possible to improve the quality of recycled products, during the remanufacturing process it is necessary to add a certain amount of additives, processing of waste plastics with improved mechanical, thermal and electrical properties.
在确定再制品配方时应当考虑到以下几点：(1)添加剂种类的选择。(2)添加剂加入量的确定。(3)配方的调整。
The following points should be taken into consideration in determining the recipes of the reproduced products: (1) the selection of the types of additives. (2) determination of the amount of additives added. (3) the adjustment of the formula.
添加剂种类的选择助剂的选择是根据塑料的品种和老化程度等来确定。
The selection of additives for additives is determined according to the variety of plastic and the degree of aging.
聚烯烃新料在加工成型时一般只添加少量助剂，如抗氧剂、紫外线吸收剂等，其废料再生时，一般只需加入少量着色剂即可，因此配方不难确定。除非这类塑料严重老化，变硬发脆，则需要根据具体情况确定配料的组成。聚氯乙烯塑料的组成比较复杂，尤其是软质聚氯乙烯，所含添加剂的种类较多，有增塑剂、稳定剂、紫外线吸收剂、润滑剂和颜料" target="_blank">颜料等，其中以增塑剂为主，用量最多。其制品在使用过程中受到光、热等气候条件的影响，增塑剂逐渐渗出，制品硬化，尤其是其物理性能大大下降，逐渐老化，不能满足使用要求而成为废品。利用这类废旧制品进行再生时必须补充足够数量的增塑剂及其他助剂，最大限度地恢复其机械性能，因此，合理确定配方十分重要。
Generally, only a small amount of auxiliaries, such as antioxidants and ultraviolet absorbers, are added to the new polyolefin materials during processing. When the waste is regenerated, only a small amount of coloring agents can be added, so the formula is not difficult to determine. Unless this kind of plastic is seriously aging, hardened and brittle, it is necessary to determine the composition of the ingredients according to the specific conditions. The composition of PVC plastics is rather complex. Especially for soft PVC, there are many kinds of additives, such as plasticizers, stabilizers, UV absorbers, lubricants and pigments, such as "target=" _blank "> pigments. Plasticizers are the main ones. Its products are affected by light and heat and other climatic conditions. Plasticizer gradually exudates, and products harden. Especially its physical properties are greatly reduced and gradually aging, which can not meet the requirements of use and become a waste product. When using such waste products to regenerate, sufficient quantities of plasticizers and other auxiliaries must be replenish to maximize their mechanical properties. Therefore, it is very important to determine the formulation rationally.
