Revealing the impacts of recycled urea–formaldehyde wastes on the physical–mechanical properties of MDF

Recycling of the urea–formaldehyde (UF) products mainly obtained from adhesive wastes of wood industries is vital and requires a high level of attention due to the environmental and human health impacts of formaldehyde and other chemicals. In this study, the complete polymerized resin, as undesired...

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Bibliographic Details
Published in:European journal of wood and wood products 2019-03, Vol.77 (2), p.293-299
Main Authors: Khonakdar Dazmiri, Mohesn, Valizadeh Kiamahalleh, Mohammad, Valizadeh Kiamahalleh, Meisam, Mansouri, Hamid Reza, Moazami, Vahid
Format: Article
Language:English
Subjects:
Addition polymerization
Biomedical and Life Sciences
Ceramics
Composites
Curing
Formaldehyde
Fourier analysis
Fourier transforms
Glass
Infrared spectroscopy
Life Sciences
Machines
Manufacturing
Manufacturing industry
Mechanical properties
Modulus of elasticity
Modulus of rupture
Natural Materials
Original
Paper board
Polymers
Processes
Production capacity
Resins
Urea
Ureas
Variance analysis
Wastes
Wood Science & Technology
Wood waste
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Summary:Recycling of the urea–formaldehyde (UF) products mainly obtained from adhesive wastes of wood industries is vital and requires a high level of attention due to the environmental and human health impacts of formaldehyde and other chemicals. In this study, the complete polymerized resin, as undesired waste product of Chassbsaz company, has been recycled and reused in the manufacturing process of medium density fiberboards (MDF). The results demonstrated that by adding recycled polymerized powder in sub-micron size to urea–formaldehyde control resin and replacing 1 wt% of the 55% solid content resin, the curing time of the resin significantly decreased. Fourier transform infrared spectroscopy (FTIR) demonstrated the chemical stability of the UF resins after adding 1 wt% recycled polymerized resin. In addition, there were substantial improvements in physical–mechanical properties [i.e., modulus of elasticity (MOE), modulus of rupture (MOR), internal bond (IB) strength and thickness swelling (TS)] of the newly manufactured board compared to that of the control board. Analysis of variance (ANOVA) was employed to study the dependency and significance of the physical–mechanical properties of the MDF on the concentration of the recycled polymer. Moreover, the production capacity was expected to significantly increase as the curing time decreased while maintaining the outstanding mechanical characteristics of the boards.
ISSN:0018-3768
1436-736X
DOI:10.1007/s00107-018-1375-z