Polypropylene (PP) resins are thermoplastic polymers, meaning they may be formed with heat and re-melted without losing their intrinsic characteristics. Thermoplastics differ in this way from thermosets, which undergo permanent change after hardening. Thermoplastics are generally recyclable for this reason. Other thermoplastics include polyethylene, polyvinyl chloride, polystyrene, polycarbonate, acrylic, acrylonitrile butadiene styrene, nylon, and polytetrafluoroethylene.
Polypropylene resins are usually opaque, low-density polymers with excellent thermoforming and injection molding characteristics. Compared with other polymers, the material has a relatively narrow temperature range, becoming brittle below -20°C and unusable in temperatures beyond 120°C. It competes primarily against polyethylene and can be made transparent for items such as see-through packages, while polyethylene can only be made translucent, as in milk jugs, for example. Polypropylene cannot match the optical clarity of polymers such as polycarbonate but it does quite well.
Polypropylene homopolymers and polypropylene copolymers make up the majority of polypropylene formulations today. The homopolymer is the general-use grade, consisting of a single propylene monomer, and is semi-crystalline in form. A variety of copolymers are available, which, when compared to the homopolymer, have increased softness, better impact resistance, better durability and toughness, improved low-temperature strength, and better crack resistance. The general-use grade is the one recommended for food contact and applications where stiffness is important. Certain blends of co- and homopolymers result in materials that have high impact strength (PP impact copolymer); or, blended with ethylene and butane, superior film-sealing properties (PP terpolymer); or improved mechanical properties such as melt strength and extensibility (PP HMS). Polypropylene is available as an expanded, low-density, closed-cell foam (EPP).
Polypropylene’s low annealing temperature makes it difficult to machine and little has been done to produce filaments that are suited to 3D printing. However, its low viscosity at melt temperatures makes it well suited to extrusion and molding applications, including blow molding, compression molding, and rotomolding, for example.
Unlike many thermoplastics, polypropylene does not readily absorb moisture, and under normal circumstances can usually be molded without being first subjected to a drying cycle.
|Analyze the project
Large and small grains, g/kg
Melt mass flow rate(2.16kg),g/
|Q/SY DS 0513
|Stretch-yield stress, MP a
|Q/SY DS 0515
|Q/SY DS 0516
|Izod Impact Strength of 23℃,J/m
|Q/SY DS 0517
|Izod Impact Strength-20℃,J/m
|Q/SY DS 0517
|Q/SY DS 0514
The main use of propylene can be divided into five categories: PP injection molding, PP drawing, PP fiber, PP film, PP pipe.
1. PP injection molding
PP plastic is mainly used in small household appliances, toys, washing machines, auto parts and so on.
2. PP wire drawing
Polypropylene wire drawing is mainly used in plastic woven products, the daily use of container bags, woven bags, food bags and transparent bags are PP wire drawing material products.
3. PP film
Polypropylene film is generally divided into BOPP film, CPP film, IPP film, PP film is mainly used in food packaging.
4. PP fibre
Polypropylene fiber is a kind of fiber product made from polypropylene by melt spinning. Mainly used in decoration, clothing and other fields, since the implementation of the two-child policy in 2011, downstream wet wipes, diapers and other maternal and infant products surge, domestic fiber material supply shortage phenomenon.
5. PP pipe
Due to the non-toxic and high temperature resistance of polypropylene, PP pipe material is mainly used in water supply and heating system, compared with PE pipe, PP pipe weight is light, convenient transportation, and environmental protection performance is better, can be recycled.
The packing is in 25kg plastic bags, which can be transported by rail or sea and stored in a dry warehouse.