Organic chemistry

What is polypropylene?

polypropylene uses

 Is polypropylene safe ?

polypropylene features

Polypropylene :

Is polypropylene safe?The polypropylene is a thermoplastic resin used for the plastic industry, it is of great importance for those responsible for the production and for buyers of raw material.

Content Index:

  • 1 What is polypropylene?
  • 2 Features
  • 3 Main applications
  • 4 How can it be processed?
  • 5 Polypropylene recycling
  • 6 How does it work?
  • 7 Benefits

Polypropylene or PP is a thermoplastic polymer produced from the polymerization of propylene or propene gas.

It is a type of plastic that can be molded when subjected to high temperatures, so it is classified as thermoplastic.

features of polypropylene :

It is a low density resin . It has properties very similar to polyethylene (PE), but its softening point is higher.

Among the main features are:

  • Low cost
  • Chemical resistance
  • Easy to mold
  • Easy coloring
  • Moderate impact resistance
  • Good thermal stability
  • Not toxic
  • Flexural strength
  • Low moisture absorption

It can be said that the PP has a balance of properties: thermal, chemical and electrical . This makes it a very versatile material.

Among the unique features of the PP is its ” hinge effect “, which offers the possibility of manufacturing parts with folds in the material itself, which is used, for example, in glasses cases and collapsible bottle caps, among others.

Polypropylene has few disadvantages, but we can highlight the low resistance of the material to the abrupt variation of the climate , which can, for example, cause spots and loss of properties when exposed to the sun.

How to solve this problem? The most used solution for this is the polymer additive with antioxidant and ultraviolet stabilizer to delay wear.

Main applications of polypropylene :

This compound has many applications in people’s daily lives. Some of these applications are:

  • Flexible packaging
  • Bags for grains and fertilizers
  • Plastic chairs
  • Toys
  • Plastic cups
  • Home appliances
  • Soft drink tops
  • Injection syringes
  • Auto parts
  • Tuppers

How can it be processed?

The versatility of polypropylene is also present in the ways in which it can be processed. They are them:

  • Injection
  • Movie Extrusion
  • Filament Extrusion
  • Thermoforming
  • Blew it

In addition, it can be said that polypropylene (PP) is an improved polyethylene (PE), since it can be replaced in applications where the exceptional chemical resistance of PE is not as necessary or not a priority.

 Recycling of polypropylene 

It can be recycled with some ease . Each plastic produced from the polymerization of propylene or propylene gas has a seal or identification mark on its products, which can be easily recognized by the triangular symbol (which refers to recyclable products), with the number five inside and with the nomenclature “PP” written.

How does it work?

In summary, this is the basic standard process for PP recycling:

  • Separation of the material according to its use.
  • Grinding to facilitate the fusion of the plastic with uniformity.
  • Material ready to receive dyes of various types.
  • Polypropylene is injected into molds that give it a new shape.

Benefits of polypropylene :

The polypropylene recycling process brings several (even economic) benefits to the company that performs it:

  • Reduction of costs related to raw materials.
  • Promotes the preservation of the environment.
  • The material that already has the versatility of the applications is now reusable (even more efficient).

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