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Polypropylene classification of the encyclopedia

Polypropylene is the largest category of individual dosage in all plastic ranges, is also the widest range of applications, you can classify the substrate, in the classification can still be different melting flow rate set specifications, or even depending on the needs of individual products to add additional additives to set out the use of the specification, such as: Single Polymer, mfr:12 Can be used in general injection of finished products, but also the production of complex silk fiber, can be deliberately made to create a broad molecular weight distribution to improve the fabric of the posterior segment processing, but also can add slip agent and anti-phase adhesive to increase the opening of the plastic bag to facilitate the finished product requirements. Therefore, the extension of the superior specifications, but the general physical nature, in the non-intentional main use is mutually alternative.
Here, try to classify the base material for reference and explain it each.
1. General grade (Homopolymer) single polymer, the continent is called Poly, the system of pure propylene polymerization of raw materials. 2. Impact-resistant grade (IMPACT copolymer) series of single polymer added ethylene propylene rubber, impact strength of the main look at the level of rubber, cold tolerance mainly depends on the level of ethylene content.
Different raw material manufacturers process, the highest ethylene content is also different.
3. Transparent grade (RANDOM copolymer) random polymer, propylene added ethylene copolymerization, ethylene irregular distribution in the polymer, mainly reduce the crystallinity of polymers and improve transparency. 4. High-crystalline (Gao Isotacticity or crystallinity) reduces the dislocation structure in the PP polymer and increases the crystallinity by increasing the regular structure content. Mainly improve the rigidity of raw materials, thermal denaturation temperature, surface hardness, scratch resistance and gloss.
Of course, adding the nucleating agent will also contribute to the improvement of the above physical property. 5. Heat seal Grade (Terpolymer) is a random polymer extension, the general propylene containing ethylene (non-EPR) content of the highest in 3.5%, but also has a process can be added to 5%, the higher the ethylene content of the softer products, heat variant temperature, softening point, heat seal temperature lower,
In order to increase ethylene content, it is necessary to make three-polymer polymers to achieve the above physical requirements by assisting butadiene or other third components. 6. Alloy Grade (ALLOY) different plastic raw materials a high proportion of the mix is called alloy grade, such as PP added LDPE can improve softness and impact strength, in processing can also reduce necking and increase flatness, in the molding can also reduce the phenomenon of falling material.
PP Plus EPR and HDPE can maintain rigidity, reduce the bleaching phenomenon caused by high EPR content, and improve the impact strength. 7. Composite material (compounding) mixed with different materials, such as the addition of glass fiber, various inorganic mineral powder, organic wood powder, paper scraps or grain micro-tablets, in PP materials to improve the physical property.
Mineral powder also includes: talc, calcium carbonate, barium sulfate, mica, carbon black, carbon fiber and bromide and so on. 8. Rubber (rubber) rubber, TPR (thermoplastic rubber) and TPE (thermoplastic elastomer), sometimes difficult to divide, and various definitions are, most of the rubber can be mixed with PP, in addition to the EPR series, it is difficult to define the mixing is positioned in the alloy or composite materials.
Usually mixed with PP rubber has EPR and EPDM, suitable for direct mixing with PP production licensing Catalloy, Plastomer, ENGAGE, Tafmer, Kraton and Santoplene.
9. Special Specifications (Specials) are not covered in the foregoing categories can be grouped into this category, such as: high melting strength raw materials (HMS, Gao Melt strength) can be used in the foaming material to improve the surface air tightness to improve the foaming effect, also can reduce the plate forming the phenomenon of falling material. 

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