resumo
Particleboard (PB), medium density fibreboard (MDF), oriented strand board (OSB) and plywood (PW), the most common products of wood panel industry, are produced by means of synthetic adhesives (resins). From the wide range of adhesives employed, amino resins as combination of formaldehyde (F) and urea (U), and melamine (M) are the most important ones, which include the most popular UF and MUF resins. This review is an introduction to the UF and MUF synthesis processes, and also addresses the key parameters for the performance of these adhesives and gives an overview about the final characteristics of PB and MDF prepared with amino resins. The characterization methods for amino resins and panels are outlined. The strategies for the optimization of resin properties and pressing conditions are discussed in terms of their good performance also under conditions of low formaldehyde emission.
palavras-chave
UREA-FORMALDEHYDE RESINS; MELAMINE-FORMALDEHYDE; COMPOSITE PANELS; MASS-TRANSFER; STRENGTH DEVELOPMENT; PHENOL-FORMALDEHYDE; DIELECTRIC ANALYSIS; THERMAL-ANALYSIS; ADHESIVE BOND; PART I
categoria
Forestry; Materials Science
autores
Goncalves, C; Paiva, NT; Ferra, JM; Martins, J; Magalhaes, F; Barros-Timmons, A; Carvalho, L
nossos autores
Ana Margarida Madeira Viegas de Barros Timmons
Professor associadoagradecimentos
PhD grant PD/BDE/174352/2016; Project POCI-01-0145-FEDER-006939 (Laboratory for Process Engineering, Environment, Biotechnology and Energy UID/EQU/00511/2013) funded by the European Regional Development Fund (ERDF), through COMPETE2020 - Programa Operacional Competitividade e Internacionalizacao (POCI) and by national funds, through FCT - Fundacao para a Ciencia e a Tecnologia; the project NORTE-01-0145-FEDER-000005 - LEPABE-2-ECO INNOVATION, supported by North Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF); the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement and 2GAR project under PT2020 (3489).