Caracterização de adesivos para madeira produzidos pela reciclagem do poliestireno

Abstract

Currently, there are two concepts that humanity is concerned with applying in all its activities: recycling and sustainability. Recycling is the process of reusing solid waste that reduces the amount of materials sent to landfills and reduces the need to extract raw materials from nature. Sustainability is a concept that is related to the continuity of the economic, social, cultural and environmental aspects of human society, meeting its needs and expressing its greatest potential in the present and preserving biodiversity and natural ecosystems. Combining the concepts of recycling and sustainability, the objective of this work is to obtain an adhesive prepared by dissolving EPS (post-consumer) in different solvents such as ethyl acetate, acetone, polyurethane diluent, thinner and D-limonene (ecological solvent). In the solubility test, these solvents were used at concentrations of 10%, 20%, 30% and 40% and the times for complete dissolution were noted. The adhesive prepared for the shear test on the glue line was 40% EPS concentration. For the EPS adhesives, 12 test specimens were produced for each quantity of adhesive: 100, 200, 300 and 400 g/m2. Commercial adhesives such as epoxy, PUR, PVA and Titebond III were also used, in the grammage recommended by the manufacturer. After preparing the test specimens and shear tests on the glue line, the results were tabulated and the ANOVA statistical test and Tukey’s test were applied. The best result was obtained with the ethyl acetate diluent, with a grammage of 200 g/m2, reaching an average value of 4.45 MPa. Comparing the average result of ethyl acetate and commercial adhesives, there was no significant difference and the highest average was for the commercial adhesive Titebond III, with an average of 5.57 MPa. It is concluded that EPS adhesive with ethyl acetate diluent can replace commercial adhesives for wood bonding.