Polypropylene is the single most used category in all plastics, and it is also the most widely used category. It can be used to classify different substrates. Within the classification, it can still be specified in different melt flow rates, even according to the needs of individual products. Add additional additives and then specify the use of specifications, such as: single polymer, MFR: about 12 can be used for general injection of finished products, can also produce multifilament fiber, but also can deliberately create a broad molecular weight distribution to improve the fiber woven fabrics after processing At the same time, it can also add lubricating agents and anti-adhesives to increase the opening of convenience plastic bags finished product requirements. As a result, many specifications have been extended, but the general physical properties are similar, and there are alternatives to each other in addition to the unintentional primary use. Here try to make reference to the different base materials for reference and explain them one by one.
1. General (HOMOPOLYMER)
The single polymer, called homopolymerization in the mainland, is the raw material for the polymerization of pure propylene.
2. IMPACT COPOLYMER
Single polymer added ethylene propylene rubber, the level of impact strength depends mainly on the level of rubber, cold degree is good or bad mainly depends on the level of ethylene content. Different raw material manufacturers have different processes and the highest ethylene content is also different.
3. Transparent Level (RANDOM COPOLYMER)
Random co-polymers, ethylene-based copolymerization of propylene, ethylene irregularly dispersed in the polymer, mainly to reduce the crystallinity of the polymer and then improve the transparency.
4. HIGH ISOTACTICITY or HIGH CRYSTALLINITY
Reducing the content of misaligned structures in the PP polymer relatively increases the content of the regular structure and also increases the crystallinity. Mainly to improve the rigidity of raw materials, heat denaturation temperature, surface hardness, scratch resistance and gloss. Of course, the addition of nucleating agents will also contribute to the above-mentioned enhancement of properties.
5. TERPOLYMER
It is an extension of random copolymers. Generally, the content of ethylene (non-EPR) in propylene is up to 3.5%, but there is also a process that can be added to 5%. The higher the ethylene content, the softer the product, and the more the thermal deformation temperature, softening point, and heat seal temperature Low, sometimes in order to increase the ethylene content with butadiene or other third component to become a tri-copolymer to achieve the above physical properties.
6. ALLOY
Different proportions of different plastic raw materials can be said to be alloy grade. For example, adding LDPE to PP can improve the softness and impact strength. It can also reduce necking and increase the flatness in processing. It can also reduce the crazing phenomenon during molding. PP plus EPR and HDPE can maintain rigidity, reduce whitening caused by high EPR content, and improve impact strength.
7. COMPOUNDING
Composite materials with different materials, such as adding glass fiber, various kinds of inorganic mineral powder, organic wood powder, paper scraps or cereal flakes, are used in PP materials to improve various physical properties. Slag also includes: talc, calcium carbonate, barium sulfate, mica, carbon black, carbon fiber and bromide.
8. Rubber (RUBBER)
Rubber, TPR (thermoplastic rubber) and TPE (thermoplastic elastomer) are sometimes difficult to demarcate, and various definitions have been made. Most of the rubber can be mixed with PP. In addition to the EPR series, it is also very Difficult to define the mixture is positioned within the alloy or composite item. The rubbers that are often mixed with PP include EPR and EPDM. The brands that are suitable for direct blending with PP include CATALLOY, PLASTOMER, ENGAGE, TAFMER, KRATON, and SANTOPLENE.
9. Special specification (SPECIALS)
Those not included in the preceding paragraph can be classified as such, for example, high melt strength raw materials (HMS, High Melt Strength) can be used to improve the surface airtightness in the foamed material to improve the foaming effect, and can also reduce the sheet forming Falling phenomenon.
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