Influence of the addition of carbon black to the mixed adhesive based on vegetable oils used to manufacture Pinus sp. composite panels

This study analyzes the influence of carbon black (CB) addition to a mixed adhesive based on vegetable oils, used in manufacturing Pinus sp. wood composite panels. To this end, test specimens were made to evaluate the following concentrations of carbon black (CB) was added at concentrations ranging from 0% to 100%. For each class of CB concentration, 6 specimens were made for physical and mechanical characterization in accordance with ABNT NBR 14810:2018 and used for microstructural analysis using Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) of the panels. As a result, the addition of CB to the vegetable oil-based mixed adhesive resulted in statistically higher average values for the mechanical properties of the panels with 30% CB, achieving the same level of significant increase as the panels with 60% CB and 100% CB in their strength values. According to the ABNT NBR 14810:2018 standards, the panels from 0% CB to 5% CB were classified as P6 (structural panels for use in severe load conditions, in dry conditions) and the panels from 10% CB to 100% CB were classified as P7 (structural panels for use in severe load conditions, in humid environments).