Estudo de viabilidade de uso da resina PVC para fabricação de juntas de flange para vedação de tubulações de utilidades

Abstract

In piping, it is very common to use flanges and this system consists of two flanges, a gasket and a set of set screws. In this context, the joints have fundamental role in guaranteeing the security of the connections and are used as elements of sealing, creating a barrier and keeping the fluid inside the pipe. This job has The objective is to study the feasibility of using polyvinyl chloride (PVC) for manufacturing of flange gaskets for sealing utility pipes (service limits up to 60°C and pressure of 19 bar), aiming at replacing the materials conventionally used in non-metallic gaskets, such as hydraulic cardboards and polytetrafluoroethylene (PTFE). PVC is one of the most used thermoplastics in the world due to its versatility and has been shown fundamental for the development of innovations and dissemination of solutions in several areas. The PVC compounds (dry blend) were obtained in an internal mixer, in three formulations: PVCC50P20, PVCC60P20 and PVCC50P10, varying the plasticizer contents (P) and/or charge (C). The specimens for carrying out the characterizations were obtained via cut into plates made by calendering and subsequent pressing. It was possible to observe the influence of additive concentrations on thermal, physical-mechanical, morphological, resistance to degradation, as well as on joint properties. It was possible to develop materials for flange joints with PVC additive, which presented characteristics intermediate to the materials usually used, such as high sealability and high recovery and excellent tensile strength. The development of this study opens the way for the carrying out other research based on the use of PVC as a matrix for joint materials of flange. As a result, a joint datasheet was developed with all the technical information presented in this work.