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Description of the additives

Antioxygens


Polymeric materials undergo the chemical destraction (rupture of molecular chains) during the recycle, processing and storage which is caused by series of complex chemical reactions of oxidation by oxygen that is presented  in the surrounding environment. As a result, it usually changes  such characteristic as elongation at break, fluidity, resistance, color and transparency of the polymer.
To prevent damage of the polymer caused by oxidation destraction, they add chemical additives called antioxygens.

 


Stabilizers


Like all organic materials, polymers undergo aging. Stabilizing agents in the polymer can slow down this process. The aging process is accompanied by a significant decrease in the mechanical and physical characteristics, including discoloration. Aged polymers become brittle, and their surface - matte.
It has long been established that to optimize the protection of the polymer over a long period of operation require different stabilizers. The nature of these are divided into:
- Stabilizers for polymer recycle - prevent the polymer from thermal decomposition during recycle, they are effective at temperatures above 130 degrees Celsius;
- Thermal stabilizers - they are added to the polyethylene immediately after its synthesis, they also protect the polymer from the high temperatures impact;
- Light stabilizers - reduce the adverse effects of light and atmospheric oxygen;

 


Antibacterial additives


It is established that bacteria and fungi may be deposited on the surface of polymer products, and even penetrate into the surface layer. Therefore, the mechanical cleaning of theproduct surface is not always effective. The bacteria and (or) fungi uprise on the surface of the polymer product can be avoided by adding ANTIBACTERIAL additives. Chemical substancessuch as desintificators are usually used as an antimicrobial additives and very effective for an extended period of time;

 


Adhesion reducing powder


Blocking is the tendency of two adjacent layers of material, such as two polymer films adhere to each other by simple physical contact. Blocking ability appears in the case of polyolefin such as PE and PP films of plasticized PVC and PETF. When temperature goes up and pressure tendency to block usually also increases. The degree of susceptibility to the effect of blocking in general determined by the smoothness of the surface. Therefore, to reduce the blocking can reduce the smoothness of the surface film due to the introduction of polymer small particles of various additives.

 

 

 Destaticizer


Polymers possess good dielectric properties that characterize their ability to accumulate static electricity, usually occurring during sliding of two materials. Static electricity appearence in polymeric materials can be prevented or at least mitigated by the introduction of the polymer antistatic. The result is the formation of the antistatic agent is a thin layer of moisture on the polymer surface, which reduces its conductivity.

 


Flame retardants


Most polymers are flammable. Therefore, to meet fire safety rules polymers must contain flame retardants (retardants) that meet the highest requirements for fire resistance. Polymer producers add flame retardants in polymers usually directly in the process of obtaining them.

 


Slip (slip agents)


Moving supplements also reduce the effect of blocking, but their mechanism of action fundamentally different. Without affecting the materials contact, they are injected between layers of thin plastic with low friction coefficients. Placed in an array of polymer film, they are mixed with it, but have a strong tendency to migrate out where and perform their function. Moving supplements are often used in polyolefin films.

 


 Antiblocks


Despite the fact that the blocking effect is often highly undesirable, in some cases, however, may need to increase it. For example, sliding the plastic bags for packing a serious problem. Antiblocks can solve it by increasing the coefficient of friction or attractive forces between adjacent surfaces.

 


Antifog


In many cases, the transparency of the package, which allows to consider the product inside is more important to the consumer of any of its aesthetic qualities. Some types of plastic can provide excellent visibility packaging. However, as a result of condensation of water molecules on the surface of the package may form a thin layer of small water droplets, which lead to dissipation of the incident light. This phenomenon, known as fogging, leads to the fact that the film or other transparent structure seems dull. Antifog action is based on increasing the critical value of surface tension of the polymer. This allows the molecules of water to wet the polymer surface, forming a continuous layer of water there, which does not scatter light, and therefore does not reduce the transparency of the material.

 


Nucleator


The use of nucleators (nucleation agents) is also associated with obtaining a high degree of packing transparency. Crystalline is often opaque plastic materials, since the crystallites scatter light. Nucleator can be used to reduce the average crystallite size, which improves the transparency of the material.

 


Flexibilizer


Flexibilizer  - a substance that is added into a rigid plastic to increase its flexibility, recycling  and elasticity. Flexibilizers also improve recycling and extrusion characteristics, reduce the minimum required temperature processing reduces hardness and improve flexibility at low temperatures, by reducing the glass transition temperature and the slipperiness chain increase. The common area of flexibilizer usage is - PVC. However, flexibilizers  are also added to other polymers such as polyurethane, and some grades of rubber.

 


Foaming agents


For the foam production producer should enter the foaming agent (steam generator) into the polymer melt.  Substances used as blowing agents, shall be either readily volatile, or allocate a large amount of gaseous products as the result of the thermal decompression when processing the polymer.

Catalog of the additives

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