添加剂种类的选择是根据塑料的品种和老化程度等来确定。
The choice of additives is determined according to the variety of plastics 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。
When the new polyolefin materials are processed, only a small amount of additives are added, such as antioxidants and ultraviolet absorbents. When the waste is recycled, only a small amount of coloring agent is added, so the formula is not difficult to determine. Unless such plastics are seriously aged, hard www.mashengchang.com www.futejixie.com www.yiwenmenye.com www.juanlianmen58.com 7 www.yuanshengmenye.com www.zhigongyiyuan.com.cnand brittle, it is necessary to determine the composition of the ingredients according to the specific circumstances.
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。
The composition of PVC is more complex, especially soft PVC. There are many kinds of additives, such as plasticizer, stabilizer, ultraviolet absorbent, lubricant and pigment. The plasticizer is the main plasticizer and the amount is the most. Its products are affected by the weather conditions such as light and heat in the process of use. The plasticizer is gradually exuded out and hardened, especially its physical properties are greatly reduced and gradually aging, which can not meet the requirements of use and become waste products. Sufficient quantity of plasticizers and other auxiliaries must be added to the recycling of this kind of waste products to maximize their mechanical properties. Therefore, it is very important to determine the formula reasonably.