Classification of polypropylene PP


Classification of polypropylene PP

Polypropylene is the largest category of all plastics in the range of plastics. It is also the most widely used category. It can be classified according to different substrates. It can still be specified in different classifications of melt flow rate in the classification, and even according to individual commodity needs. Additional additives are added to define the application specifications. For example, in a single polymer, MFR: about 12 can be used for general injection of finished products, and multifilament fibers can also be produced. It is also possible to specially manufacture a broad molecular weight distribution to improve the post-processing of fiber woven fabrics. At the same time, it is also possible to add a slip agent and an anti-adhesion agent to increase the opening property and facilitate the requirements of the finished plastic bag. Therefore, many specifications have been extended, but the physical properties are similar, and they are alternative to each other except for non-intentional main purposes. Here, try to classify the different substrates for reference and explain them one by one.

1. General grade (HOMOPOLYMER) Single polymer, known as homopolymer in the mainland, is a raw material obtained by polymerizing pure propylene.

2. IMPACT COPOLYMER is a single polymer with ethylene propylene rubber. The impact strength is mainly based on the high and low rubber content. The cold resistance is mainly based on the ethylene content. Each raw material manufacturer has a different process and the highest ethylene content.

3. RANDOM COPOLYMER Random copolymer, which is a propylene-added ethylene copolymer. The ethylene is irregularly dispersed in the polymer, which mainly reduces the crystallinity of the polymer and improves the transparency.

4. HIGH ISOCICTICITY or HIGH CRYSTALLINITY Reducing the content of the dislocation structure in the PP polymer increases the crystallinity by increasing the content of the regular structure. Mainly improve the rigidity, heat denaturation temperature, surface hardness, scratch resistance and gloss of raw materials. Of course, adding a nuclear enhancer will also contribute to the improvement of the above physical properties.

5. The heat seal grade (TERPOLYMER) is an extension of random copolymer. Generally, the propylene contains ethylene (non-EPR) content up to 3.5%, but there are also processes that can be added to 5%. The higher the ethylene content, the softer the product, the heat change temperature. The softening point, the lower the heat sealing temperature, sometimes in order to increase the ethylene content, the butadiene or other third component is used to become a tri-copolymer to meet the above physical properties.

6. Alloy grade (ALLOY) The high proportion of different plastic raw materials can be described as alloy grade. For example, PP added LDPE can improve softness and impact strength, reduce necking and increase flatness in processing, and reduce molding. Falling phenomenon. PP plus EPR plus HDPE can maintain rigidity, reduce whitening caused by high EPR content, and improve impact strength.

7. COMPOUNDING Composite materials with different materials, such as glass fiber, various mineral mineral powder, organic wood powder, paper scraps or grain microchips, in PP materials to improve various physical properties. Mineral powders include: talc, calcium carbonate, barium sulfate, mica, carbon black, carbon fiber and bromide.

8.Rubber (RUBBER) rubber, TPR (thermoplastic rubber) and TPE (thermoplastic elastomer), sometimes difficult to distinguish, and there are various definitions, most of the rubber can be mixed with PP, except Outside the EPR series, it is also difficult to define that the mixing is positioned within the alloy or composite item. The rubbers usually mixed with PP are EPR and EPDM. The brands that are suitable for direct mixing with PP are CATALLOY, PLASTOMER, ENGAGE, TAFMER, KRATON and SANTOPLENE.

9. SPECIALS (SPECIALS) Those that are not covered in the previous category can be classified into this category. For example, high melting strength materials (HMS, High Melt Strength) can be used in foaming materials to improve surface airtightness and improve foaming effect. It can also reduce the phenomenon of falling material in sheet metal forming.

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