Polypropylene granules; Specifications + purchase

Polypropylene granule (which is often known as textile PP and chemical PP) is a special structure of polypropylene polymer that is used in the form of pellets (granules) to produce various products in various forms. Polypropylene granules are used to produce cable and wire coating, bottles, cans, etc. In the following, we will explain the technical specifications, features and applications of this granule.

What is polypropylene (pp)?

After polyethylene, polypropylene is the second most widely used thermoplastic in various industries, which recently in granulated form can have more applications in the production of products. Polypropylene, along with polyethylene, is made by the cracking process of naphtha (crude oil light distillation) under relatively mild temperature and pressure conditions and in the presence of the famous Ziegler-Natta catalyst. Compared to PE, PP has lower impact resistance, but higher usage temperature and higher tensile strength.

Classification of polypropylene

Polypropylene materials are divided into two general categories. Homopolymer polypropylene, which is produced from the polymerization of propylene monomer alone, and polypropylene copolymer, which is produced from the polymerization of propylene along with ethylene comonomer.
In common terminology, polypropylene homopolymer is called textile PP and polypropylene copolymer is called chemical PP.

Homopolymer

This polypropylene is produced from the polymerization of propylene monomer alone. In terms of physical and mechanical properties, the difference between polypropylene homopolymer (textile PP) and copolymer (chemical PP) is in their impact resistance, tensile strength and hardness. Although polypropylene homopolymer has higher tensile strength and hardness than polypropylene copolymer, its main weakness is its impact resistance. In fact, polypropylene homopolymer is more fragile than polypropylene copolymer. This weakness shows itself more in low temperatures, especially below zero degrees.
For this reason, the use of polypropylene homopolymer in the production of injection parts that are exposed to impact and low temperature is extremely limited. To fix this defect, ethylene monomer is injected into propylene during the polymerization process.

Copolymer

Polypropylene copolymer is produced from the polymerization of propylene along with ethylene comonomer. Polypropylene copolymer has a higher impact resistance than polypropylene homopolymer. By adjusting the amount of ethylene added to the polymer structure, adjusting the morphology of the copolymer, adjusting the type of crystallization, and also adjusting the molecular weight, the impact resistance can be controlled and raised to a good extent. Of course, it should be noted that increasing the impact resistance of polypropylene will reduce the hardness and stiffness of the polymer.
Adding ethylene to the structure of polypropylene during the polymerization of propylene reduces the structural order of polypropylene. Decreasing the structural order, in turn, causes a decrease in the amount of crystallization (crystallization) of polypropylene. Polypropylene copolymer itself is also divided into block and random copolymers, and the description of these two forms of copolymers is beyond the scope of this article.

Polypropylene granules

Polypropylene granule is a type of granular polymer that needs to be melted and then shaped in order to use it in various industries. In fact, all polymers can be converted into granules, depending on the type of application and the amount of viscosity, as well as the way they are polymerized. Due to the many advantages of granules, the granular form of polypropylene has a wider application for the production of composite products. Generally, most polymers for industrial use are first granulated and then melted to form the final product and then formed into the final product.

گرانول پلی پروپیلن نوعی پلیمر دانه‌دانه بوده که برای استفاده از آن در صنایع مختلف، ضروریست که ابتدا ذوب و سپس شکل‌دهی شود.

Characteristics of polypropylene granules

Among the important characteristics of polypropylene granules, we can mention low density (0.9-0.91 g/cm3), high transparency, high rigidity and destructive resistance against environmental stresses and high tensile strength. In addition, polypropylene has high temperature resistance (melting temperature 160-170 degrees Celsius) and also shows good chemical resistance against acids, bases and solvents. With the passage of time, the applications of this polymer have increased and it has been able to have a significant impact on the quality of products. In addition, the low cost of polypropylene production compared to other thermoplastics has made pp have a special place in the industry.

The most common use of polypropylene granules

Injection molding uses polypropylene granules the most, and after that, the second sector that consumes polypropylene is the fiber industry. Of course, the most widely used industries that use polypropylene granules as a raw material are those that produce plastic products by air molding.

Of course, polypropylene pp is used for making durable boxes, frames for video and audio devices, fishing nets, anti-rot nets, drinking liquid bottles, cable and wire covers, making bottles and cans and tanks, printing and graphic films, and packaging sheets. , water pipes and sewer pipes, screw bandages, sanitary cloths, curtain cloths, non-woven textiles, all kinds of toys, luggage and plastic bags, sterilizable medical devices, caps and caps, household appliances, electronic appliances and electric and…Also, the use of polypropylene granules in the packaging industry is very evident.

Types of polypropylene granules based on usage

We examined the classification of granules based on their structure. Another type of classification for PP granules is based on uses and applications. Polypropylene granules are classified into six groups based on their uses:

Injection polypropylene granule (Injectoin Molding)

The most consumption of polypropylene is in this category, which includes the production of electrical and electronic appliances, household appliances, packaging industries, automobile industry, caps and caps, sterilizable medical devices, luggage, toys, etc.

Fibers

This group ranks second in polypropylene consumption. This type of PP is sold in the textile industry in the form of single fibers and yarns in various finenesses, and its uses include rope, non-woven fabrics, curtain fabrics, sanitary fabrics, car interior fabrics, bandages, etc. .. is

Blow Molding Polypropylene Granule

This grade is mostly used in the production of tanks, cans and bottles.

Sheet/Film

Graphic and printing films, cigarettes, packaging sheets, as well as food packaging with heat are among the products of this group.

pipe

It is used in the production of water and sewage pipes and hot water pipes. Production of wires and cables is also one of the products of this group of polypropylenes.

Advantages of polypropylene granules

Polypropylene will gradually replace LDPE light polyethylene.

“Polypropylene has outstanding characteristics compared to other polymers. After polyethylene, polypropylene is the most widely used thermoplastic in the world, which comes out of petrochemicals in the form of powder, but due to the problems it creates during production (such as cleaning, hygiene, etc.), it is turned into granules. The advantage of using polypropylene granules for the production of plastic products compared to the powder form is in the variety of products and also in increasing their efficiency, and on the other hand, it reduces the initial costs of producing these products.

In addition, polypropylene has several advantages over other polymers. Among the advantages of PP, the following can be mentioned:

Relatively cheap price of propylene monomer compared to monomers of other polymers
The low price of PP compared to other polymers
PP specific weight and light
Flexibility and a wide range of PP production with variable physical and chemical properties
Increasing new applications and improving the properties of new production grades
Increasing the use of PP in medical devices and equipment and developing specific grade PP applications
Increasing the use of PP as an alloy with other polymers
Replacing polymers such as PS, PE, etc. with PP

Disadvantages

Polypropylene has a high coefficient of thermal expansion, which limits temperature applications
Sensitivity and damage to ultraviolet radiation
Polypropylene has less resistance to chlorine and aromatic solvents
Polypropylene is known to be difficult to paint because of its poor bonding properties.
Polypropylene is highly flammable.
Tendency to oxidize in open air

گرانول پ پ بر اساس موارد مصرف به 6 دسته تقسیم می شود

Buy polypropylene granules

Petrochemicals such as Shazand, Maron, Polynar, Rizal, Jam, Navid Zar Shimi and Bandaramam are producers of polypropylene granules.
Shams Javed company is one of the producers of this granule in Iran, which produces and supplies polypropylene granule using first grade petrochemical powder. Producers can call 02179615000 to buy polypropylene granules or refer to pp price page to know the weekly PP price.