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Jiangsu Huida Medical Instruments Co.,Ltd

Knowledge Of Plastic: Polypropylene The Classification Of Encyclopedia

1. General level (HOMOPOLYMER) polymer, city, known as polymers, pure propylene polymerization of raw materials.

2. impact resistance level (IMPACT COPOLYMER) add a single polymer ethylene-propylene rubber, impact strength is mainly look at the rubber content, vinyl cold tolerance level is mainly look at content level. The raw material manufacturers process different high ethylene content is also different.

3. transparent level (RANDOM COPOLYMER) random copolymers, adding ethylene copolymerization of propylene, irregularly dispersed in polymers of ethylene, mainly to reduce the crystallinity of polymers to improve transparency.

4. high crystallinity level (HIGH ISOTACTICITY or HIGH CRYSTALLINITY) PP reduction of dislocation structure in polymer content, improve rules of content, will also enhance the crystallinity. Major improvements in material stiffness, thermal denaturation temperature, surface hardness, scratch resistance and gloss. Of course adding agents also will contribute to the promotion

5. hot seal level (TERPOLYMER) is random total polymer of extends, General propylene containing vinyl (non-EPR) content highest in 3.5%, but also has business drive can added to 5%, vinyl content more high products more soft, hot variant temperature, and softening points, and hot seal temperature more low, sometimes to to increased vinyl content to by help d II en or other third ingredients became three total polymer to up above real sex requirements.

6. the alloy grade (ALLOY) different plastic raw materials a high proportion of mixed alloy grade, for example PP LDPE can improve flexibility and impact strength, in the process also reduces the necking and increases smoothness, molding material can reduce the phenomenon. PP added EPR HDPE can maintain rigidity, reduce the bleaching of high EPR content, improved impact strength.

7. composites (COMPOUNDING) mixing of different materials called composites, inorganic materials such as glass fiber, mineral powder, organic wood, scraps of paper, or grain micro-chip, to improve physical performance in the PP material. Mineral powder include: calcium carbonate, barium sulfate, talc, mica, carbon black, carbon fiber and bromides.

8. rubber (RUBBER) rubber, TPR (thermoplastic rubber) and TPE (Thermoplastic Elastomer), sometimes it's hard to, and defined there are, most of the rubber can be mixed with the PP, in addition to EPR series, it is difficult to define the mix is positioned within the alloys or composites. Ordinary rubber mixed with PP EPR and EPDM, suitable for mixing directly with PP CATALLOY, and PLASTOMER, ENGAGE, and TAFMER, KRATON, SANTOPLENE etc.

9. Special specifications (SPECIALS) class is not covered in the preceding paragraph can fall into this category, for example: raw material of high melt strength (HMS, and High Melt Strength) may be used in foams improved air tightness improved foaming on the surface, also can reduce the sheet fall of material phenomena.

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