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

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 (mela...

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Bibliographic Details
Published in:International journal of adhesion and adhesives 2022-09, Vol.117, p.103020, Article 103020
Main Authors: Santos, J., Pereira, J., Paiva, N., Ferra, J., Magalhães, F.D., Martins, J.M., de Carvalho, L.H.
Format: Article
Language:English
Subjects:
ABES
Adhesive
Adhesive bonding
Citric acid
Formaldehyde
FTIR-ATR
Melamine
Particle board
Raw materials
Resins
Ureas
Water resistance
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Summary: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.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2021.103020