Polypropylene PP

Polypropylene PP

Polypropylene (PP) is a thermoplastic obtained from the polymerization of propylene and can be recycled.

PolypropylenePP was first produced on a laboratory scale in the early 1950s and then entered commercial production later this decade. Polypropylenease was first estimated that the production cost of polypropylene PP is lower than polyethylene PE.
PP polypropylene is produced in three forms: isotactic, syndiotactic, and atactic, which is mainly in the isotactic form with the addition of a small amount of other monomers (mostly polyethylene PE).

Tensile resistance, low density, colorless, hardness, resistance to acid, base and solvents are among the characteristics of polypropylene PP. Its low production cost compared to other thermoplastics has created a special place for polypropylene PP in the industry.


PP polypropylene is mainly produced in the following six categories

1. Injection Molding
2. Fibers
3. Sheet/Film
4. Blow Molding
5. Pipe
6. Extrusion Coating (protective coating)

Injection Molding:

Polypropylene PP is the most widely used in this category, which is used in the production of electrical and electronic devices, caps and hats, toys, luggage, household items, and packaging and automobile industries.

Polypropylene Fibers:
The second application of polypropylene PP in this category is in the production of fibers used behind carpets and zilo, as a substitute for sisal and hemp fibers in carpets and sack yarns, non-woven fibers, heat and cold insulating clothing fabrics.

This part of polypropylene PP application has grown significantly in recent years. Candy and chocolate packaging industries, cigarettes, graphic films and printing, food packaging sheets that are formed by heat.

Blow Molding:
Bottles and cans.

Sewer pipe and pipe, wire and cable.

Extrusion Coating (protective coating):
This part of PP consumption is gradually replacing the use of LDPE light polyethylene
Polypropylene (PP) is one of the plastics that has various applications in different parts and also as fibers. Their higher melting point and service temperature compared to other polymers has led to the increasing development of their use in various parts. On the other hand, due to their acceptable strength and low water absorption, their fibers can compete with nylon fibers in many applications, such as for carpeting around swimming pools or miniature golf courses.

Polypropylene is one of the most widely used plastics and is widely used in various industries today. Despite the fact that for a certain weight, PP is a little more expensive than polyethylene (PE). Polypropylene
Polypropylene polymer with an approximate density of 0.9 grams per cubic centimeter is obtained from the polymerization of propylene monomer. This material is resistant to moisture, oils and common solvents and melts at a temperature of about 170 degrees Celsius. This non-toxic and odorless substance turns into wax-like melted drops when burning like a candle and burns with smokeless flames and a slightly unpleasant smell. The combination of properties such as lightness, hardness, toughness, chemical resistance and surface polish has led to the variety of products made from this material. One of the important properties of PP is its high stability against bending in low thickness, which enables the production of very diverse parts.

Polypropylene in all kinds of fields, for example, in the automobile industry, in the manufacture of door panels, interior decorations, propellers, car floor coverings, battery boxes, etc. It is consumed. Most drinking straws are made of PP. Most parts of bags and toys are also made from this polymer. Approximately 10% of PP production is used in the production of films that are used in food packaging. About 30% of the PP produced is used in the production of monofilaments and fibers. PP fibers are used in making carpets, rugs, ropes, sacks, etc.

Although polypropylene in the form of homopolymer is used a lot, but the copolymer of propylene and ethylene also has a growing market. By increasing ethylene during polymerization, a polymer with a lower modulus and higher impact resistance is obtained. The higher the amount of ethylene, the more obvious the above effects will be. These copolymers are available in both random (Random Copolymer) and block (Block Copolymer) forms.

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