Desenvolvimento de borracha termoplástica por vulcanização dinâmica. TPV-(NBR+PP)
Herrera, Julio César Alzate
HERRERA, J. C. A.
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The union of technology of thermoplastic and rubber has contributed to the development of thermoplastic elastomers (TPE), which was evidenced through the study of patents in TPE in the last 20 years, where Japan and the United States are the leaders. Trends in TPE are: modification to polymer structure in styrenic TPEs in order to employ the dynamic vulcanization, use of nanofibres and nanoclays, and resists oil TPEs using hydrogenated nitrile rubber to improve the properties of hot air and aging. The main variables in the development of TPE should take into account the surface energy the thermoplastic and elastomer, the elastomer entanglement, crystallinity of thermoplastic, proportions of the thermoplastic and compatibilizer. Typically the articles produced with nitrile, may be obtained using the technology or conventional rubbers (vulcanized), and not having possibility of recycling of defective products and materials vulcanizates. The purpose is to develop a thermoplastic nitrile rubber by dynamic vulcanization (TPV-(NBR + PP)) using conventional techniques for mixing between nitrile rubber and polypropylene. The development of nitrile rubber thermoplastic by dynamic vulcanization, TPV (NBR+PP) were studied with variation of vulcanization system, variation of proportion of NBR/PP and type of compatibilizer. The main results on development of TPV-(NBR+PP) were obtained with the use of system of vulcanization type phenolic resin, with compatibilizer Ph-PP and with 4,0phr of amine (6PPD). Developed a nitrile rubber thermoplastic by dynamic vulcanization (TPV-(NBR + PP)) with good performance in reprocessabilidade, using equipment and techniques conventional thermoplastic processing, which will help to satisfy the demands of industry.