Comparativo entre duas técnicas de análise da granulometria das resinas de PVC

Abstract

In the PVC industry the average size and particle size distribution have an effect on otherresin properties, such as bulk density, powder flow characteristics and general mixing and processing properties. Resins with very small particles tend to suffer more serious problems during the blending process as they tend to develop more quickly temperatures in the gaps between the propeller and the walls of the mixer which can either cause pre-plastification of the compound, as well as its partial decomposition. The increase in the average diameter is favorable to the processing, since it allows a more uniform plasticization of the compound. These problems led to the study of different analytical techniques to obtain the distribution of particle diameters from the manufacturing process. Two different techniques were used to determine the particle diameter distribution curve: laser diffraction (using Malvern's Mastersizer 2000 electronic equipment) and the Air Jet Screen (using the Air Jet LS E200 equipment). Where we can conclude from the analyzes and results obtained that the laser diffraction methodology is more adequate to analyze the granulometric profile of the PVC resins, as it presents a greater scanning and expression of more accurate data with a shorter process response time.