Desenvolvimento e caracterização de compósitos sanduíche para isolamento térmico

Abstract

A sandwich panel consists essentially of two face sheets and may even have metal reinforcements and a core formed, usually by a cellular polymer. The faces of this type of panel may be joined by a structural adhesive or in cases where the core is a rigid polyurethane foam injected directly on the substrates the union will occur naturally. The most relevant property of the sandwich panels for the transport of frozen (0ºC a -30ºC) or chilled (7ºC a 1ºC) cargo is thermal conductivity (k). Within this context the objective of this work is to obtain and characterize sandwich panels which can be used in refrigerated chambers. This work presents four alternatives for composite sandwich, sample 1 (PRFV/PU/PRFV), sample 2 (AG/PU/AG), sample 3 (Al Crimpy/PU/PRFV) and sample 4 (Al /PU/Al), were PRFV is a glass fibre reinforced plastics, PU is a rigid polyurethane, AG is galvanized steel, Al Crimpy is crimpy aluminum and Al is aluminum. These composites were characterized by physicalmechanical, thermal, morphologic and cost. It could be concluded that the AG/PU/AG showed the best cost versus performance.