Polypropylene (P.P) Granules

PP Injection Molding Grade

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. Polypropylene is one of the most widely used plastics in the world.

This granulated polymer has more applications in the industry. PP is one of the soft and warm resins. Polypropylene granules are used in various cases, such as making car parts, construction and industrial equipment, pipe making, medical and laboratory equipment, textile, food packaging, injection molding, blow molding, sheet, film, etc. Granular polypropylene is the second most widely used thermoplastic in various industries, compared to PE, PP has lower impact resistance, but higher usage temperature and higher tensile strength.

What is polypropylene granule (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 (light crude oil 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.

Polypropylene granule specifications
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 a high temperature resistance (melting temperature 170-160 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, medical devices that can be sterilized, caps and caps, Household appliances, electronic and electrical appliances and…

Advantages of polypropylene granules
“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 causes 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 as well as 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
Specific weight and light PP
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 special grade PP applications Increasing the consumption of PP as an alloy with other polymers Replacing polymers such as PS, PE, etc. with PP Disadvantages of polypropylene granules Polypropylene has a high coefficient of thermal expansion, which limits temperature applications Sensitivity and damage to ultraviolet radiation Polypropylene is less resistant 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 Classification of polypropylene Polypropylene materials are divided into two general categories. Polypropylene homopolymer, 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 terms, polypropylene homopolymer is called textile PP, and polypropylene copolymer is called chemical PP. a
The difference between homopolymer (textile PP) and copolymer (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 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.

PP granule types based on uses
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:

Injectoin Molding Granule Polypropylene: The most consumption of polypropylene is in this category, which includes the production of electrical and electronic appliances, household appliances, packaging industries, automotive 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 threads 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.
Film and sheet (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.
Coating and protection (Extrusion Coating): This part of polypropylene will gradually replace LDPE light polyethylene.
How to buy and price of granules P.P
On Toosplast website, you can choose and order the polypropylene granule you want according to the desired feature and the prices received by the experts Toosplast. Here, we help you to choose and buy the granule you want at the best price, among the various offers of the manufacturers. Toosplast, a supplier of all kinds of granules and plastic waste, is proud to guide you in the field of specifications and providing the best price for purchasing polypropylene (PP) granules.

It is enough for you to communicate with our colleagues and make your request, so that our colleagues will search for the best daily price of the product with your desired specifications among the manufacturers as soon as possible and announce the best one to you.