Effects of Hydrolysis on the Removal of Cured Urea-Formaldehyde Adhesive in Waste Medium-Density Fiberboard
DOI:
https://doi.org/10.23960/jsl181-9Abstract
The vast production of medium-density fiberboard (MDF) in the world is expected to generate a large quantity of waste MDF after its service life, which requires the recycling of waste MDF (wMDF). This work attempted to investigate the removal of cured urea-formaldehyde (UF) resins adhesive in wMDF using hydrolysis for a possible way of recycling wMDF. The wMDFs were fabricated with two kinds of recycled fibers (RFs): refiner recycled fibers (RRFs) and hammer mill recycled fibers (HRFs) from red and radiata pine. The wMDFs were also produced at different RFs contents, such as 0, 5, 10, 20, 30, 50, and 100%. The panels were then hydrolyzed with water and oxalic acid solution to remove the cured UF resins. The Kjeldahl method was applied to determine the nitrogen (N) content in the panel before and after hydrolysis. Regardless of the wood species and recycling process, the mass loss, pH, and formaldehyde liberation of wMDFs after hydrolysis were greater for oxalic acid than those in water, confirming a greater N content had been extracted by oxalic acid than water. The resin removal became greater as the RFs content increased. In addition, the resin removal was slightly greater in wMDFs made of HRFs than the RRFs. Moreover, red pine RFs gave higher resin removal than radiata pine. These results suggested that a proper combination of the recycling process and additives could make it possible to recycle wMDF panels in the future.
Keywords: cured urea-formaldehyde, hydrolysis, medium-density fiberboard, oxalic acid, recycling
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Donaldson, L. A., and Lomax, T. Da. 1989. Adhesive/Fibre Interaction in Medium Density Fibreboard. Wood Science and Technology 23(4): 371–380. DOI: 10.1007/BF00353254
Dunky, M. 1998. Urea–Formaldehyde (UF) Adhesive Resins for Wood. International Journal of Adhesion and Adhesives 18(2): 95–107. DOI: 10.1016/S0143-7496(97)00054-7
Dutkiewicz, J. 1983. Hydrolytic Degradation of Cured Urea-Formaldehyde. Journal of Applied Polymer Science 28(11): 3313–3320.
Grigsby, W. J., Carpenter, J. E. P., and Sargent, R. 2014a. Investigating the Extent of Urea Formaldehyde Resin Cure in Medium Density Fiberboard : Resin Extractability and Fiber Effects. Journal of Wood Chemistry and Technology 34(3): 225–238. DOI: 10.1080/02773813.2013.861850
Grigsby, W. J., Carpenter, J. E. P., Thumm, A., Sargent, R., and Hati, N. 2015. Labile Extractable Urea-Formaldehyde Resin Components from Medium-Density Fiberboard. Forest Products Journal 65(1–2): 15–19. DOI: 10.13073/FPJ-D-14-00030
Grigsby, W. J., Thumm, A., Carpenter, J. E. P., and Hati, N. 2014b. Investigating the Extent of Urea Formaldehyde Resin Cure in Medium Density Fibreboard: Characterisation of Extractable Resin Components. International Journal of Adhesion and Adhesives 50: 50–56. DOI: 10.1016/j.ijadhadh.2013.12.020
Hutchby, M. 2013. Novel Synthetic Chemistry of Ureas and Amides. Springer-Verlag. DOI: 10.1017/CBO9781107415324.004
Jada, S. S. 1988. The Structure of Urea—Formaldehyde Resins. Journal of Applied Polymer Science 35(6): 1573–1592. DOI: 10.1002/app.1988.070350614
Kharazipour, A., and Kues, U. 2007. Recycling of Wood Composites and Solid Wood Products. in: Wood Production, Wood technology, and Biotechnological Impacts U. Kües, ed. Universitätsverlag Göttingen, Göttingen 509–533.
Liu, M., Wang, Y., Wu, Y., and Wan, H. 2018. Hydrolysis and Recycling of Urea Formaldehyde Resin Residues. Journal of Hazardous Materials 355: 96–103. DOI: 10.1016/j.jhazmat.2018.05.019
Lubis, M. A. R., Hong, M. K., and Park, B. D. 2018a. Hydrolytic Removal of Cured Urea–Formaldehyde Resins in Medium-Density Fiberboard for Recycling. Journal of Wood Chemistry and Technology 38(1): 1–14. DOI: 10.1080/02773813.2017.1316741
Lubis, M. A. R., Hong, M. K., Park, B. D., and Lee, S. M. 2018b. Effects of Recycled Fiber Content on the Properties of Medium Density Fiberboard. European Journal of Wood and Wood Products 76(5): 1515–1526. DOI: 10.1007/s00107-018-1326-8
Lubis, M. A. R., and Park, B. D. 2018. Analysis of the Hydrolysates from Cured and Uncured Urea-Formaldehyde (UF) Resins with Two F/U Mole Ratios. Holzforschung 72(9): 759–768. DOI: 10.1515/hf-2018-0010
Morris, J. 2017. Recycle, Bury, or Burn Wood Waste Biomass?: LCA Answer Depends on Carbon Accounting, Emissions Controls, Displaced Fuels, and Impact Costs. Journal of Industrial Ecology 21(4): 844–856. DOI: 10.1111/jiec.12469
Müller, G., Schöpper, C., Vos, H., Kharazipour, A., and Polle, A. 2009. FTIR-ATR Spectroscopic Analyses of Changes in Wood Properties During Particle- and Fiberboard Production of Hard- and Softwood Trees. BioResources 4(1): 49–71. DOI: 10.15376/biores.4.1.49-71
Myers, G. E. 1986. Resin Hydrolysis and Mechanisms of Formaldehyde Release from Bonded Wood Products. in: Wood Adhesives in 1985: Status & Needs A. W. Christiansen, ed. Forest Products Laboratory, Wisconsin 119–156.
Ormondroyd, G. A., and Stefanowski, B. 2015. Fibreboards and Their Applications. Wood Composites Elsevier. DOI: 10.1016/B978-1-78242-454-3.00005-6
Park, B. D., and Jeong, H. W. 2011. Hydrolytic Stability and Crystallinity of Cured Urea–Formaldehyde Resin Adhesives with Different Formaldehyde/Urea Mole Ratios. International Journal of Adhesion and Adhesives 31(6): 524–529. DOI: 10.1016/j.ijadhadh.2011.05.001
Pizzi, A., and Mittal, K. 2003. Handbook of Adhesive Technology, Revised and Expanded. Handbook of Adhesive Technology, Revised and Expanded CRC Press. DOI: 10.1201/9780203912225
Roffael, E., Behn, C., Schneider, T., and Krug, D. 2016. Bonding of Recycled Fibres with Urea-Formaldehyde Resins. International Wood Products Journal 7(1): 36–45. DOI: 10.1080/20426445.2015.1131918
TAPPI. 1997. Fiber Length of Pulp by Classification, Test Method T 233 cm-95. Technical Association of the Pulp and Paper Industry, United States.
TAPPI. 2001. Analysis of Formaldehyde in Aqueous Solutions and of Free Formaldehyde in Resins, Test Method T 600 om-15. Technical Association of the Pulp and Paper Industry (TAPPI). United States.
Tatà no, F., Barbadoro, L., Mangani, G., Pretelli, S., Tombari, L., and Mangani, F. 2009. Furniture Wood Wastes: Experimental Property Characterisation and Burning Tests. Waste Management 29(10): 2656–2665. DOI: 10.1016/j.wasman.2009.06.012
Wan, H., Wang, X. M., Barry, A., and Shen, J. 2014. Recycling Wood Composite Panels: Characterizing Recycled Materials. BioResources 9(4): 7554–7565. DOI: 10.15376/biores.9.4.7554-7565
Wilcox, K. E. 2014. Using Regression Analyses for the Determination of Protein Structure from FTIR Spectra. Thesis. University of Manchester.
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