Caracterização de blocos flutuantes de espuma de poliuretano

Abstract

Polyurethane is a polymer material consisting essentially of a mixture of isocyanate and polyol, being also used in its synthesis, additives to obtain specific characteristics. This polymer has wide applicability and can be found in the form of resins, adhesives, elastomers, foams, among others. Rigid polyurethane foams are widely used as thermal insulation in the industry and can also be applied in the manufacture of surf boards, in which these foams play a structural role in the boards, where it is used as the core material in the composite sandwich structure with the resin and fiber. Because of this structural nature, the study of the mechanical properties of these rigid foams is very important, which is the objective of this work, aiming to evaluate the mechanical properties of commercial polyurethane blocks used for making boards, and polyurethane blocks synthesized in the laboratory, in two different mixing ratios, from a commercial mixture obtained to work. The results showed that an increase in mixing ratio there is a decrease in pore size and hig her densification of the foam, in addition, demonstrate these denser foams having higher mechanical properties. The analyzed commercial foam had a higher compressive strength, bending and higher density than those synthesized in the laboratory.