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Additives

The pure polymer processing procedure into the end-product is rarely complete without the input of certain compounds, called additives. Additives are put in during the extrusion process and injection molding or applied directly to the molded products made of plastic.


There are many reasons to use additives in polymers, such as:


1. Improves conditions of the processing procedure;
2. Increases polymer resistance to the oxidation;
3. Provides high resilience at impact;
4. Regulates firmness;
5. Regulates the surface tension;
6. Facilitates the process of extrusion and injection molding;
7. Regulates the blocking tendency;
8. Reduces the cost of the material;
9. Increases fire resistance;


The amount and load of the additives put into the polymeric material depends on the polymer  type and the intended use of the end-product. For example, polyethylene (PE) can only contain an antioxidant, but in some cases, it is necessary to put in a dyeing additive. There can be many options, and in most cases, the final composition of the polymer material is intended to be a company secret.


Some additives, especially if there is a high concentration needed, are added into the polymer directly during the production. On the other hand, it is a common customer requirement to add dyeing concentrates, for example  stabilizers that improve fade resistance of the polymer product.

The main additions are:

 

  • Antioxygens
  • Stabilizers
  • Antibacterial additives
  • Adhesion reducing powder
  • Destaticizer
  • Flame retardants
  • Fillers
  • Slips (slip agents)
  • Antiblocks
  • Nucleator
  • Antifog
  •  Flexibilizer
  • Foaming agents
  •  

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