Water resistance evaluation of a MFU resins with different molar ratio catalyzed with citric acid

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022

Autores

Santos, J (Autor) Outra; Pereira, J (Autor) Outra; Paiva, N (Autor) Outra; Ferra, J (Autor) Outra; Magalhães, F. D. (Autor) FEUP; Martins, JM (Autor) Outra; de Carvalho, LH (Autor) Outra

Revista

Título: International Journal of Adhesion and Adhesives

Vol. 117

ISSN: 0143-7496

Editora: Elsevier

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-00V-HQK

DOI: 10.1016/j.ijadhadh.2021.103020

Abstract (EN): Urea, in either solid form or in solution, is an additive commonly used to control the viscosity or act as a scavenger in MF (melamine-formaldehyde) and MUF (melamine-urea-formaldehyde) resins for particleboard production. The aim of this work was to evaluate the influence of adding urea to MF (melamine-formaldehyde) resin in terms of the water-resistance of the final particleboards. FTIR-ATR spectroscopy, adhesive bonding evaluation system (ABES) and gravimetric techniques were used. MF and MFU (melamine-formaldehyde-urea) resins were prepared. Urea was introduced as an additive, in different percentages (0, 10, 20, and 30% (on adhesive, dry basis), and citric acid was used as catalyst. Beech veneer strips were bonded together with these formulations and then tested in dry conditions and after immersion in water for 24 h. The effect of urea load on the resin curing reaction in dry and humid joints was studied. Particleboards were produced with MF and MFU (melamine formaldehyde urea) resins with different urea loads and using industrial recycled wood particles as raw material. Particleboard evaluation indicated that the water resistance of the final particleboards decreased linearly with urea addition.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9