Síntesis y evaluación mecánica de paneles tipo sándwich compuestos por fibra de vidrio y poliuretano reforzado con micropartículas de caucho.

Abstract

The present the titling work aimed to study the effect of the presence of rubber microparticles in a polyurethane foam core for a sandwich panel with fiberglass sheets (GFRP) through both physical and mechanical tests. The methodology used for the manufacture of the panel was by a co-curing process, where, first, the fiberglass was manufactured with a curing time of 2 days so that the resin applied reaches its optimal working conditions, then they were cut in dimensions of 200 x 400 mm and located on a wooden support having a separation of 50 mm, by pouring or casting the mixture of polyol and isocyanate is applied in the existing separation between sheets of fiberglass for its expansion and formation of the sandwich panel, the Co-curing process does not need an extra layer of adhesive to fix the sheets with the core. The total thickness of the sandwich panels remains constant at 50 mm, while the rubber content varies by 0%, 20% and 30% of the weight of the foam core Flat compression, edge compression, three-point bending and density tests are performed according to ASTM standards, in addition to ISO flammability tests. The results have been analyzed resulting in the incorporation of rubber microparticles providing the core with greater flexibility, reducing the creep limit and flame propagation rate, as well as increasing the density of the core. In order to achieve greater uniformity of the mixture between polyol, isocyanate and rubber microparticles, the use of a mixing machine is recommended, which will facilitate the panel production process.