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Plastic raw materials polypropylene is a linear hydrocarbon polymer, expressed as CnH2n. PP, like polyethylene (see HDPE, L/LLDPE) and polybutene (PB), is a polyolefin or saturated polymer. Plastic raw materials polypropylene is one of those most versatile polymers available with applications, both as a plastic and as fiber, in virtually all of the plastics end-use markets.
Following the work by Ziegler in Germany, the process for producing "stereoregular" polymers was perfected by Professor Giulio Nattain in Italy. Natta produced the first polypropylene resin in Spain in 1954. Natta utilized catalysts developed for the polyethylene industry and applied the technology to propylene gas. These new polymers with their ability to crystallize soon became popular and polypropylene is now a very successful product in many areas. Commercial production began in 1957 and plastic raw materials polypropylene usage has displayed strong growth from this date. The versatility of the polymer (the ability to adapt to a wide range of fabrication methods and applications) has sustained growth rates enabling PP to challenge the market share of a host of alternative materials in a plethora of applications including... |
The properties of Polypropylene include... Semi-rigid Translucent Good chemical resistance Tough Good fatigue resistance Integral hinge property Good heat resistance Plastic raw materials polypropylene does not present stress-cracking problems and offers excellent electrical and chemical resistance at higher temperatures. While the properties of PP are similar to those of Polyethylene, there are specific differences. These include a lower density, higher softening point (PP doesn't melt below 160oC, Polyethylene, a more common plastic, will anneal at around 100℃), and higher rigidity and hardness. Additives are applied to all commercially produced polypropylene resins to protect the polymer during processing and to enhance end-use performance. |
Grade Selection The choice of grade for any application is based on consideration of any, or all, of the following points: Homopolymer: stronger, stiffer - higher HDT Copolymer: better impact, more transparent MFI: ease of flow vs. toughness. | |
talc-filled 10 40% talc increases hardness and HDT, but at the expense of toughness. glass-reinforced 30% glass fiber increases strength, stiffness, and HDT, but drastically reduces the impact. Advantages Good chemical resistance. Good fatigue resistance. Better temperature resistance than HDPE. Lower density than HDPE. Disadvantages Oxidative degradation is accelerated by contact with certain materials, e.g. copper. High mold shrinkage and thermal expansion. High creep. Poor U.V. resistance. Applications Buckets, bowls, crates, toys, medical components, washing machine drums, battery cases, bottle caps. Elastomer modified for bumpers, etc. Talc filled for additional stiffness at elevated temperatures - jug kettles, etc. OPP films for packaging (e.g. crisps, biscuits, etc.). Fibers for carpets, sports clothing. |
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