Plastic additives, also known as plastic additives, are compounds that must be added to improve the processability of the polymer during processing or to improve the performance of the resin itself. Plastic additives can be divided into process additives and functional additives according to their use.
In view of the above two characteristics of PVC, plastic additives such as heat stabilizers, lubricants and processing aids must be added to the pure PVC resin for normal use. The addition of plasticizer to PVC can eliminate the interaction between PVC molecules and increase the mobility of the molecules, so that the processing melting temperature is lowered, which is lower than the thermal decomposition temperature of PVC. And thus obtain a soft PVC product.
In addition, some functional additives are added to the PVC formulation as needed. For example, the filler can reduce the cost, increase the dimensional stability of the product, and the foaming agent can reduce the density of the product.
PVC is a plastic product that consumes the most plastic additives due to its diverse products, complex formula, large output and wide application. In order to design a PVC formula, it is necessary to have a deeper understanding of various additives. It is absolutely not enough to understand PVC resin.
The main additives that may be used in PVC formulations are: heat stabilizers , (internal and external) lubricants, plasticizers, fillers, antioxidants, light stabilizers, processing aids, impact modifiers, antistatic Agent, flame retardant, antibacterial agent, colorant, coupling agent, and the like.