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Scavengers for achieving zero formaldehyde emission of wood-based panels |
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| Authors: | Nuno A Costa João Pereira João Ferra Paulo Cruz Jorge Martins Fernão D Magalhães Adélio Mendes Luísa H Carvalho |
| Institution: | 1. Laboratório de Engenharia de Processos, Ambiente e Energia (LEPAE), Faculdade de Engenharia, Universidade do Porto, rua Dr. Roberto Frias, 4200-465, Porto, Portugal 2. Associa??o Rede de Competências em Polímeros (ARCP), Porto, Portugal 3. EuroResinas—Indústrias Químicas, S. A., Sines, Portugal 4. Departamento de Engenharia de Madeiras (DEMad), Instituto Politécnico de Viseu, Campus Politécnico de Repeses, 3504-510, Viseu, Portugal |
| Abstract: | This work examines the performance of three formaldehyde scavengers in wood-based panels. Sodium metabisulfite, ammonium bisulfite and urea were applied in different physical forms during particleboard production, and the resulting physico-mechanical properties (internal bond strength, thickness swelling, density and moisture content) and formaldehyde emission levels were compared. Formaldehyde content was measured using the perforator method, and formaldehyde emission was evaluated both by desiccator and gas analysis methods. The chemical reactions involved in each formaldehyde scavenging process are proposed and discussed. The tested scavengers showed distinct performances under the different emission testing conditions, which were interpreted in terms of the stability of the chemical compounds formed upon formaldehyde capture. Sodium metabisulfite proved to be an excellent scavenger for all formaldehyde methods allowing the production of particleboard panels with zero formaldehyde emission. |
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