Abstract
ABSTRACT The objective of this work was to evaluate the feasibility of using lignin-phenol-formaldehyde resin in the production of Mimosa scabrella Benth (bracatinga) structural particleboard. The boards were produced with nominal specific mass of 0.75 and 0.95 g/cm3, 10% and 12% of phenol-formaldehyde and lignin-phenol-formaldehyde resins, with 10 and 12 min of pressing time. The boards quality was evaluated by means of the following physical-mechanical tests: specific mass, compression ratio, water absorption and thickness swelling after 2 and 24 hours soaking, perpendicular traction, static bending and screw pulling. Positive interactions of specific mass, resin content and pressing time were observed in the properties of the boards produced. The evaluation of the properties results based on the requirements of EN 312 (type P5) standard indicated the feasibility of using lignin-phenol-formaldehyde resin in the production of particleboard of Mimosa scabrellla for structural applications.
Highlights
The urea-formaldehyde and phenol-formaldehyde resins are the main types of thermoset synthetic adhesives used by industries of wood boards
The evaluation of the properties results based on the requirements of EN 312 standard indicated the feasibility of using lignin-phenol-formaldehyde resin in the production of particleboard of Mimosa scabrellla for structural applications
In view of the above, the objective of this work was to evaluate the potential use of the resin lignin‐phenol‐formaldehyde in replacing the conventional phenol-formaldehyde resin in the particleboard for structural purposes using the wood of Mimosa scabrella Benth
Summary
The urea-formaldehyde and phenol-formaldehyde resins are the main types of thermoset synthetic adhesives used by industries of wood boards. The phenol‐formaldehyde is the most used in the production of boards for structural purposes intended for external environment, with or without protection, such as plywood and OSB. Due to the pressures for materials and processes that mitigate the environmental impacts, interest grows in natural adhesives such as the soy-based, castor polyurethane resin, and those consisting of lignocellulosic residues, such as the lignin and tannins. The lignin-based adhesives from the wood pulping process surplus to obtain cellulose are aligned with the interest described above for two main reasons: they 1) employ raw materials from renewable sources and from scrap of industrial production, and 2) promote a reduction in the use of synthesized components with phenol and urea, when mixed with conventional adhesives
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