The impact of altering the molar ratio on formaldehyde content and the physical and mechanical properties of MDF panels
Source abstract
Abstract
This study aimed to evaluate the influence of the molar ratio of urea-formaldehyde resin (UF) on formaldehyde content and the physical and mechanical properties of MDF panels. The goal was to determine the optimal composition, i.e. the one that exhibits the lowest formaldehyde content without compromising the properties. To that end, there were five treatments. They were characterized by five F:U molar ratios (0.9:1; 1.0:1; 1.1:1; 1.2:1; and 1.3:1). The panels had a nominal density of 750 kg.m−3, dimensions of 40 × 40 × 1.5 cm, 12% resin, 1% paraffin. They were produced with a pressing cycle with a temperature of 170 °C and pressure of 3.6 MPa per 10 min. The physical-mechanical properties of the panels and the formaldehyde content were determined and evaluated following the NBR 15316-2 (2019) standard. Results showed that the formaldehyde content was lower for panels produced with resin molar ratios of 0.9:1, 1.0:1, and 1.1:1, classified as E1. Panels with a resin molar ratio of 1.2:1 were classified as E2. The molar ratio of 1.3:1 exceeded the limits of the standard. Panels with resin molar ratios of 1.1:1, 1.2:1, and 1.3:1 met the standard requirements for all physical-mechanical properties of non-structural MDF for use in dry conditions. These results indicate that the most suitable UF resin molar ratio for producing MDF panels is 1.1:1. This radio provides low formaldehyde content and technological properties compatible with the reference standard.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Textile materials and evaluations · Structural Analysis of Composite Materials · Material Properties and Processing
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Forestry Engineering, University of the State of Santa Catarina, Santa Catarina, Brazil
Sudati MDF, Santa Catarina, Brazil
References (52)
Show source-provided references
1. Ayrilmis N, Nemli G. Effect of adhesive type on chipboard quality properties. Mach Technol Mater. 2017;11(7):364–365.
2. Katsukake A. A review of urea formaldehyde resin used in the production of wood-based panels [dissertation]. Bauru (SP): Faculty of Sciences of the São Paulo State University “Júlio de Mesquita Filho”; 2009.
3. 10.1201/978020391222510.1201/9780203912225 ↗
4. Carneiro ACO, Vital BR, Frederico PGU, et al. Properties of chipboard sheets manufactured with angico-vermelho (Anadenanthera peregrina) tannic adhesive and urea-formaldehyde. Tree Mag. 2009;33(3):521–531.
5. Carvalho LH, Magalhães FD, Ferra JM. Formaldehyde contents from wood-based panels – testing methods and industrial perspectives. Cheng, CB, editor. Formaldehyde: chemistry, applications, and role in polymerization. Hauppauge (NY): Nova Science Publishers, Inc; 2012. p. 207.
6. IARC. Monographs on the evaluation of cancinogenic risk to humans. Formaldehyde, 2-butoxyethanol and 1-tert-butoxypropan-2-ol. Vol. 88. Lyon: International Agency for Research on Cancer IARC; 2006.
7. INCA. Causes and prevention formol. National Cancer Institute; 2022. Available at: https://www.inca.gov.br/exposicao-no-trabalho-e-no-ambiente/solventes/formol.
8. European Committee for Standardization. EN 13986: wood-based panels for use in construction – characteristics, evaluation of conformity and marking. Brussels: European committee for standardization; 2004.
9. American National Standards Institute. ANSI A(208) 1–2: particleboard and fiberboard. Gaithersburg: ANSI; 2002.
10. CARB. Airborne toxic control measure to reduce formaldehyde contents from composite wood products. Health and safety code: title 17, California Code of Regulations. Sacramento (CA): California Air Resources Board; 2009.
11. Japanese Industrial Standards. JIS A 5908: particleboard. Tokyo: Japanese Standards Association; 2003.
12. Brazilian Association of Technical Standards. NBR 15316 – medium density fiber panels. Rio de Janeiro: Brazilian Association of Technical Standards; 2019.
13. 10.1016/j.buildenv.2005.11.02610.1016/j.buildenv.2005.11.026 ↗
14. 10.1002/app.3432710.1002/app.34327 ↗
15. 10.1016/j.ijadhadh.2011.05.00110.1016/j.ijadhadh.2011.05.001 ↗
16. 10.1021/acs.macromol.1c0007310.1021/acs.macromol.1c00073 ↗
17. 10.1016/j.ijadhadh.2016.10.00410.1016/j.ijadhadh.2016.10.004 ↗
18. 10.3390/polym1305067310.3390/polym13050673 ↗
19. Lessmann V E. Study of the curing reaction of Urea-formaldehyde resins by Nuclear Magnetic Resonance Spectrometry. Curitiba (PR) Federal University of Paraná; 2008.
20. 10.1016/S0143-7496(97)00054-710.1016/S0143-7496(97)00054-7 ↗
21. Myers GE. How mole ratio of UF resin affects formaldehyde emission and other properties: a literature critique. For Prod J. 1984;34(5):35–41.
22. 10.1002/(SICI)1099-0518(19990401)37:7<995::AID-POLA14>3.0.CO;2-610.1002/(SICI)1099-0518(19990401)37:7<995::AID-POLA14>3.0.CO;2-6 ↗
23. 10.1002/app.2353810.1002/app.23538 ↗
24. 10.1016/j.buildenv.2005.11.02810.1016/j.buildenv.2005.11.028 ↗
25. Keinert AC. Moisture resistance and formaldehyde content in medium density particleboards manufactured with different melamine urea formaldehyde resins [dissertation]. Curitiba: Federal Technological University of Paraná; 2021.
26. Frackowiak I, Warcok F, Fuczek D, et al. The influence of UF molar ration selected particleboard properties. Drewno Prace Naukowe. Doniesienia Komunikaty. 2011;54(186):40–49.
27. Zhang H, Liu J, Lu X. Reducing the formaldehyde content of composite wood products by cold plasma treatment. Wood Res. 2013;58(4):607–616.
28. American Standard of Testing Methods. ASTM D1084-97. Standard test methods for viscosity of adhesives. West Conshohocken (PA): ASTM; 1998.
29. American Standard of Testing Methods. ASTM D2471. Standard test method for gel time and peak exothermic temperature of reacting thermosetting resins. West Conshohocken (PA): ASTM; 1999.
30. American Standard of Testing Methods. ASTM D1490. Standard test method for nonvolatile content of urea-formaldehyde resin solutions. West Conshohocken (PA): ASTM; 2013.
31. Iwakiri S, Keinert SJr, Mendes LM, et al. Wood panels. 1st ed. Curitiba: Federal University of Paraná; 2002. p. 196.
32. 10.1016/j.ijadhadh.2020.10264610.1016/j.ijadhadh.2020.102646 ↗
33. 10.13073/0015-7473-62.2.14610.13073/0015-7473-62.2.146 ↗
34. 10.1007/BF0261094910.1007/BF02610949 ↗
35. Park BD, Kim JW. Effects of formaldehyde to urea mole ratio on thermomechanical curing of urea-formaldehyde resin adhesives. Mokchae Konghak J Korean Wood Sci Technol. 2007;35(5):76–86.
36. 10.1021/acs.iecr.0c0226810.1021/acs.iecr.0c02268 ↗
37. 10.1007/BF0260749310.1007/BF02607493 ↗
38. Belini UL, Fiorelli J, Savastano HJr, et al. M. Formaldehyde free in Eucalyptus and sugarcane panels. Braz J Wood Sci. 2015;6(2):94–99.
39. Irle M, Belloncle C, Guezguez B. Free formaldehyde – where can I find it?. Proceedings of the International panel products symposium. Espoo: University of Wales Bangor School of Education; 2008. p. 31–38.
40. Martins DAL. A Importância das Emissões de Formaldeído e Compostos Orgânicos Voláteis de Placas de Derivados de Madeira na Qualidade do Ar Interior [dissertation]. Portugal: University of Porto; 2020.
41. 10.1002/9781119162346.ch410.1002/9781119162346.ch4 ↗
42. Maloney TM. Modern particleboard and dry-process fiberboard manufacturing. San Francisco: M. Freeman; 1993. p. 689.
43. Silva GA, Mendes LM, Calegário N, et al. Estimation of equilibrium humidity of wood panels. Sci For. 2006;70:23–29.
44. Melo RR, Stangerlin DM, Sousa AP, et al. Physical-mechanical properties of wood-bamboo particleboards. Rural Sci. 2015;45(1):35–42.
45. 10.1002/app.2365410.1002/app.23654 ↗
46. Tomazello Filho M, Belini UL, Oliveira JTS, et al. Technological evaluation of wood and Eucalyptus MDF panels by X-ray densitometry. Wood Architect Eng. 2010;11(27):45–58.
47. 10.1515/HF.2007.11610.1515/HF.2007.116 ↗
48. Maloney TM. Modern particleboard and dry process fiberboard manufacturing. San Francisco: Miller Freeman; 1989. p. 672.
49. Trianoski R. Assessment of the potential of alternative fast-growing forest species for the production of particleboard panels [dissertation]. Curitiba: Federal University of Paraná; 2010.
50. Ferreira JL. Influence of process variables on the technological properties of medium density fiber panels (MDF) [dissertation]. Lages (SC): State University of Santa Catarina; 2020.
51. Torquato LP, Iwakiri S, Bonduelle GM, et al. Evaluation of the physical and mechanical properties of medium density fiber panels (MDF) produced by Brazilian industries. Forest. 2010;40(2):275–280.
52. 10.1021/acsapm.1c0152110.1021/acsapm.1c01521 ↗