Evaluation of UF resin content in MDF boards after hot-pressing by Kjeldahl method

Taheri, Fatemeh; Enayati, A A; Pizzi, A.; Lémonon, Jérôme; Layeghi, Mohammad

doi:10.1007/s00107-015-1003-0

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…6). An influx of nitrogen (N) content (27.5%) on the board can be attributed to the utilization of UF resin [36]. This confirms the presence of N-containing resin components across the bundle of fibers.…”

Section: Characterizationmentioning

confidence: 65%

Optimization of <i>Durio zibethinus </i>(Durian) Fiber-Reinforced Composite as Automotive Skin Material

Aguilar

Lawagon

2022

MSF

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Medium-density fiberboard (MDF) was developed from Durio zibethinus (durian) husk using urea formaldehyde (UF) as a binder. The output will be applied as an automotive panel, realigning the conventional application of MDFs. Fiberboards were prepared at varying mixing ratios and pressing pressure to determine the optimal conditions. The fibers and optimized fiberboard were characterized in terms of surface morphology, elemental analysis, FT-IR analysis, and thermal stability. Moreover, the physical and mechanical properties of fiberboard were also studied. Results showed that the fiberboard was optimized at a 1:4 fiber-to-resin ratio by mass and press pressure of 640 kPa. It has a density of 0.71 g/cm3, thickness swelling (TS) of 3.33%, water absorption (WA) of 62.44%, internal bond (IB) of 2.85 MPa, modulus of elasticity (MOE) of 3008.06 MPa, and modulus of rupture (MOR) of 22.25 MPa. These were compared against properties of commercial MDF based on American National Standards Institute (ANSI) specifications (0.5≤D≤1, TS≤15%, IB≥0.6 MPa, MOE≥2500 MPa, and MOR≥22 MPa). Based on the results, the optimized fiberboard demonstrated high potential for commercial application in the automotive industries.

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Section: Characterizationmentioning

confidence: 65%

Optimization of <i>Durio zibethinus </i>(Durian) Fiber-Reinforced Composite as Automotive Skin Material

Aguilar

Lawagon

2022

MSF

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“…Titration is done to measure the ammonia concentration in the sample. It is generally accepted that ammonia concentration is proportional to nitrogen content in the sample (Taheri et al 2016). Before titration, the distillate solution is diluted to about 250 ml with ammonia-free water.…”

Section: Titrationmentioning

confidence: 99%

The Removal of Cured Urea-Formaldehyde Adhesive towards Sustainable Medium Density Fiberboard Production: A Review

Manohar

Laksana²,

Fatriasari

et al. 2021

JSL

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Medium density fiberboard (MDF) is an engineered wood product that has density and specific gravity similar to solid wood, ranging from 600 to 800 kg/m3 of density and 0.6 to 0.8 of specific gravity. This makes MDF suitable to partially replace solid wood, particularly for interior application. Approximately over than 100 million m3 of MDF are produced in 2020, resulting in a large amount of waste MDF will be generated in the next 20 years. MDF is produced using urea-formaldehyde (UF) resins adhesive. UF resins adhesive is a poly-condensation product of urea and formaldehyde via an alkaline acid two-step reaction. Sustainable MDF production is required as the world is facing climate change and deforestation. Recycling is a way to support sustainable production in the engineered wood products manufacturing. Many attempts have been done to find ways to recycle waste MDF. The main problem is UF resins, which bond the MDF panel fibers. In order to re-manufacture the waste MDF into new recycled MDF, UF resins should be eliminated from the waste MDF before being used. The presence of UF resins in MDF can interfere with the utilization of the recycled fibers, whether it will be used as a raw material for new MDF or other composite products. This paper reviews the process of removal of cured UF resins from waste MDF panel by considering the hydrolytic stability of cured UF resins for MDF recycling, providing a comprehensive review of how cured UF resins can be removed from waste MDF and characterization of recycled fibers obtained from recycling prior to re-manufacturing of recycled MDF panel.Keywords: hydrolysis, medium density fiberboard, resin, recycling, resin removal, urea-formaldehyde

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“…Nevertheless, not only the type of resin, but also the distribution of the fibers is equally important for quality of final products. The resin distribution and resin content affect the mechanical properties of the wood-based panels (Andre et al 2010;Irle et al 2010;Taheri et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Rapid determination of urea formaldehyde resin content in wood fiber mat using near-infrared spectroscopy

Zhu

et al. 2022

BioRes

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Monitoring the process is crucial for ensuring high quality in wood-based panel production. Interest in the distribution of resin in fibers and particles has increased during the last couple of decades. This study considered the potential to determine urea formaldehyde (UF) resin content in fiber mat using near-infrared (NIR) spectroscopy. Fiber mats with various resin contents were investigated with NIR combined with the partial least squares (PLS) regression and root mean square error of calibration and validation (RMSECV). The external factors, such as the distance between the fiber optic probe and the sample surface and light sources, were also evaluated. The results showed that this technique can sufficiently determine the resin content in the resinous fiber mat with accuracy of up to 95%. The light sources and the distances from the probe to the surface did not significantly influence the discrimination and prediction of resin content.

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Evaluation of UF resin content in MDF boards after hot-pressing by Kjeldahl method

Cited by 6 publications

References 14 publications

Optimization of <i>Durio zibethinus </i>(Durian) Fiber-Reinforced Composite as Automotive Skin Material

Optimization of <i>Durio zibethinus </i>(Durian) Fiber-Reinforced Composite as Automotive Skin Material

The Removal of Cured Urea-Formaldehyde Adhesive towards Sustainable Medium Density Fiberboard Production: A Review

Rapid determination of urea formaldehyde resin content in wood fiber mat using near-infrared spectroscopy

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