Incorporação de resíduo de caulim e fibras de caroá em painéis de média densidade - MDF.

Abstract

Medium-density panels are composites molded under high temperature and pressure which have physical and mechanical properties similar to those of solid wood. Their composition includes eucalyptus grandis fibers and pinus elliotii fibers, but other fibers can be used such as caroa fibers. The goal of this work was to manufacture panels which kaolin waste and caroa fibers and compare their physical, chemical and mechanical of these panels with a commercial panel produced with eucalyptus and pine. Both residue and the fibers were characterizated by: X-ray diffraction, chemical analysis, differential thermal analysis, thermal gravimetric analysis and sieve analysis. The specimens were prepared by molding using compositions containing residue and fibers. Test samples were evaluated by three point bending, internal bond, water absorption / swelling in thickness, density and moisture content. Results indicate that the composite panels manufactured which caroa fibers are more dense compared than the commercial MDF composite pannel. Samples that do not have the kaolin had lower water absorption and swelling, as well as lower flexural and tensile properties flexion. The properties of the composites comply to ABNT 15316, rules allowing caroa fibers the manufacture of MDF composite.