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A method for the production of expanded polypropylene and end product made of expanded polypropylene
A method for the production of expanded polypropylene and end product made of expanded polypropylene
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机译:生产膨化聚丙烯的方法和由膨化聚丙烯制成的最终产品
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摘要
The present invention relates to a process comprising the following phases: the feeding and melting of polypropylene to obtain a molten polymer; addition to the molten polymer of possible additives; mixing of the molten polymer with the additives; introduction of the expanding agent CO2 into the molten polymer; extrusion of the molten polymer, expanding agent and possible additives to produce an expanded polypropylene, wherein the polypropylene fed and melted in the first phase consists of a polypropylene which contains a quantity ranging from 15 to 25% of high melt strength polypropylene and wherein the temperature is lowered to a value of about 160 DEG C immediately after introducing the CO2 gas into the molten polymer. IMAGE
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