How additives affect PVC properties?

PVC (Polyvinyl chloride) is one of the most synthesized plastic materials used in packaging, construction, and automotives. In the production process of PVC products, some additives are added to manipulate the physical or mechanical properties of the final products and improve processing capabilities. Additives are vital in modifying processing properties, product character, and quality. They are of many types, including the following:

1. Plasticizers

Plasticizers are used as softening agents. Some examples include Phthalates, Adipates, and Trimellitates, to name a few. These additives enhance the rheological properties of vinyl products by raising the temperature. They are also add

ed to increase mechanical performance such as toughness and strength. Factors that affect the selection of plasticizers of vinyl polymer are: Volatility Cost 

2. Heat Stabilizers

PVC has very low thermal stability. Stabilizers help prevent the degradation of polymer during processing or exposure to light. When subjected to heat, vinyl compounds initiate a self-accelerating dehydrochlorination reaction. These stabilizers neutralize the HCl produced enhancing the life of the polymer. Factors to consider while selecting heat stabilizers are: Technical requirements Regulatory/Approval/Cost

3. Fillers

Fillers are added to PVC compounds for a variety of reasons. Today, a filler can be a true performance additive by delivering value in new and interesting ways at the lowest possible formulation cost. 

They help to: 

Increase stiffness and strength

Improve impact performance

Add color, opacity, and conductivity

And Some types of fillers include calcium carbonate, titanium dioxide, calcined clay, glass, talc, etc.

4. Lubricants

Several types of lubricants improve the properties of PVC. 

They include:

External lubricants assist in the smooth passage of PVC melt through processing equipment.

Internal lubricants reduce melt viscosity, prevent overheating, and ensure good color of the product.

Other additives like processing aids and impact modifiers are added to enhance mechanical as well as surface properties of PVC.

2. About us

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