Estudo sobre a influência de aditivos antiácidos em compostos de polipropileno

Abstract

Polypropylene is one of the most consumed plastics in the world and its synthesis takes place mainly from the use of Ziegler-Natta catalyst systems, in which catalysts and their supports are compounds containing chlorine in their composition. Acid residues, based on chlorides, remain in Polypropylene after its polymerization, causing problems related to the corrosion of metallic equipment for processing such polyolefin, in addition to the degradation of the polymer and additives present, such as primary antioxidants. To neutralize such residues, antacid additives are used in the PP industry and recommended in several literatures. Thus, the present work aimed to study and understand the influence of different types of antacids (Hydrotalcite and Calcium and Magnesium Stearates), at different levels of 0.05%, 0.10% and 0.20%, on properties mechanical, thermo-oxidative, color and gloss for PP compounds for application in the automotive sector, working with the company LyondellBasell. Thus, a good behavior was observed among the properties tested for the Hydrotalcite-type antacid, especially at levels from 0.10%.