Process for obtaining microwave absorbing coatings (2 - 20GHz) based on polyurethane and epoxy resins added with carbon and ferrite partìculas

摘要

Process for obtaining coatings microwave absorbers (2 to 20 GHz) based on polyurethane and epoxy resins added with partu00ecculas carbon and ferrite.The patent of invention of a process for obtaining electromagnetic absorbers in the range from 2 to 20 GHz by using as a base polymer polyurethane and epoxy resins.Polymer matrixes based on polyurethane and epoxy resins are impregnated with carbon particles, types: carbon black (NF), graphite (g) and / or carbon fibre (CF), choppedFerromagnetic materials (MF), ferrimagnu00e9ticos (MFI) and antiferromagnu00e9ticos (MAF) and fosqueante agent based on silica.The coating obtained is then applied to the substrate and dried at room temperature for approximately 72 hours.The potential application of these coatings reaches the sectors aeroespacaial, aviation, telecommunications and related areas.