scholarly journals UTILIZATION OF PINUS RESINATED Oversize FIBERS IN PRODUCTION OF PARTICLEBOARDS

2019 ◽  
Vol 43 (5) ◽  
Author(s):  
Morgana Cristina França ◽  
Alexsandro Bayestorff da Cunha ◽  
Caio Cesar Faedo de Almeida ◽  
Bruna Laís Longo ◽  
Willian Grubert
Keyword(s):  
Dimensional Stability ◽  
Urea Formaldehyde ◽  
Medium Density Fiberboard ◽  
Raw Material ◽  
Formaldehyde Resin ◽  
Medium Density ◽  
Technical Feasibility ◽  
Pressing Cycle ◽  
Nominal Density ◽  
Pinus Spp

ABSTRACT The objective of this study was to evaluate the technical feasibility of producing particleboard from oversize resin fibers in a reduced proportion of adhesive. It was used as raw material, oversize resin fibers discarded from the MDF (Medium Density Fiberboard) production process, flake particles of Pinus spp. derived from an MDP (Medium Density Particleboard) company’s chipper and adhesive formed by the urea-formaldehyde resin and paraffin emulsion. The experiment consisted of five treatments, mixing particles and fibers in different proportions (100: 0%; 75: 25%; 50: 50%; 25: 75%; 0: 100%). Three panels were produced per treatment, with nominal density of 650 kg.m-3, 8% resin and pressing cycle of 160ºC, 40 kgf.cm-2 for 8 minutes. The properties of the panels were evaluated by the procedures described in ASTM D-1047 (1993), DIN 53362 (1982) and ABNT / NBR 14810 (2013). The results showed that oversize resin fibers have potential for use in the sector, especially in quantities above 75%, a fact that was evidenced by the values found for dimensional stability and strength/stiffness. For internal adhesion, the increase in the number of fibers above 25% was not significant.

scholarly journals Calcium carbonate modified urea–formaldehyde resin adhesive for strength enhanced medium density fiberboard production

RSC Advances ◽  
2021 ◽  
Vol 11 (40) ◽  
pp. 25010-25017
Author(s):  
Li Lu ◽  
Yan Wang ◽  
Tianhua Li ◽  
Supeng Wang ◽  
Shoulu Yang ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Urea Formaldehyde ◽  
Medium Density Fiberboard ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Medium Density ◽  
Ionic Bond ◽  
Resin Adhesive ◽  
Uf Resin ◽  
Modified Urea

Reactions between CaCO3 and CH2O2 during polycondensation of UF resin produce Ca2+. Ionic bond complexation binds Ca2+ with UF resin. The UF resin crystalline percentage decreases from 26.86% to 22.71%. IB strength of resin bonded fiberboard increases from 0.75 to 0.94 MPa.

Labile Extractable Urea-Formaldehyde Resin Components from Medium-Density Fiberboard*

2015 ◽  
Vol 65 (1-2) ◽  
pp. 15-19 ◽  
Author(s):  
Warren J. Grigsby ◽  
James E. P. Carpenter ◽  
Armin Thumm ◽  
Rosie Sargent ◽  
Nancy Hati
Keyword(s):  
Urea Formaldehyde ◽  
Medium Density Fiberboard ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Medium Density

scholarly journals SHORT NOTES: APPLICATION OF MINERAL FILLER IN MEDIUM DENSITY FIBERBOARD (MDF) AND ITS EFFECT ON MATERIAL PROPERTIES AS A FUNCTION OF PARTICLE SIZE

Wood Research ◽  
2021 ◽  
Vol 66 (5) ◽  
pp. 891-899
Author(s):  
TOMASZ OZYHAR
Keyword(s):  
Particle Size ◽  
Material Properties ◽  
Filler Content ◽  
Urea Formaldehyde ◽  
Medium Density Fiberboard ◽  
Strength Properties ◽  
Inorganic Filler ◽  
Formaldehyde Resin ◽  
Medium Density ◽  
Wood Fibers

The addition of inorganic filler material in medium density fiberboard (MDF) and the effect on material properties as a function of particle size was examined. Medium density fiberboard was manufactured in a laboratory scale environment to a target raw densityof 750 kgm-3. Wood fibers were replaced by using calcium carbonate at 3 and 10 wt.% using fillers with weighted median particle sizes of d50= 2.0 μm and d50= 30 μm, respectively. Urea formaldehyde resin was used as binder in all MDF. The influence of filler addition on the modulus of elasticity, bending and tensile strength, dimensional stability and liquid permeability was investigated. The results demonstrate the effect of filler content and its dependence on particle size. The addition of filler with d50= 30 μm does not have any influence on material properties up to a filler content of 10 wt.%. Using the finer filler with d50= 2.0 μm at 10 wt.% filler, the quantity significantly increases the water adsorption and swelling behavior and reduces the strength properties of the MDF.

NaOH Treatment Impact in the Dimensional Stability of Banana Pseudostem Particleboard Panels

2014 ◽  
Vol 600 ◽  
pp. 447-451 ◽  
Author(s):  
Bárbara Maria Ribeiro Guimarães ◽  
Lina Bufalino ◽  
José Benedito Guimarães Jr. ◽  
Rafael Farinassi Mendes ◽  
Lourival Marin Mendes ◽  
...  
Keyword(s):  
Water Absorption ◽  
Dimensional Stability ◽  
Urea Formaldehyde ◽  
Thickness Swelling ◽  
Technical Feasibility ◽  
Pressing Cycle ◽  
Naoh Treatment

This work intends to verify the technical feasibility of NaOH treatment in particleboard manufacture made from banana pseudostem fibers. The particles were treated for a 24 hour period and subsequently washed with water to remove the product. The concentration used was NaOH at 0.5%. The adhesive used was urea - formaldehyde at 12%, the pressing cycle was 4 MPa, at 160 °C for 8 minutes. The water absorption after 2 hours immersion was 148.79% and 189.83% after 24 hours. Thickness swelling value after 2 hours was 54.96% and 74.05% after 24 hours. The results were above the literature values and the minimum values required by the CS 236-66 standard for swelling after 24 hours immersion.

High density polyethylene matrix composite as reinforcing agent in medium density fiberboards

2020 ◽  
Vol 54 (28) ◽  
pp. 4369-4385
Author(s):  
Ricardo Ritter de Souza Barnasky ◽  
Alexsandro Bayestorff da Cunha ◽  
Amanda Dantas de Oliveira ◽  
Martha Andreia Brand ◽  
Gabriela Escobar Hochmuller da Silva ◽  
...  
Keyword(s):  
Matrix Composite ◽  
High Density Polyethylene ◽  
Mechanical Performance ◽  
Urea Formaldehyde ◽  
High Density ◽  
Formaldehyde Resin ◽  
Medium Density ◽  
Polyethylene Matrix ◽  
Reinforcing Agent ◽  
Pinus Spp

This work provides a study about the incorporation of a high density polyethylene (HDPE) matrix composite in medium density fiberboards (MDF). A composite was processed in a single screw extruder with 5% of Pinus spp fibers in a HDPE matrix and applied as reinforcing agent in MDFs, as well as pure HDPE, in 11 different variations, using 12% of urea-formaldehyde resin and nominal density of 750 kg.m−3. The composite and the pure HDPE were analyzed by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The DSC results showed that both polymeric matrix and composite presented the same melting temperature but the composite had a reduced melting enthalpy and crystallinity due to thermal history. SEM analysis showed a well distribution of fibers on the composite. The results of technological properties of MDFs were compared to commercial MDF standards. The MDF reinforced with 40% of polymeric composite reached all minimum standard requirements, being the most recommended to be used as an alternative to conventional MDF, in terms of physical and mechanical performance.

Easy procedure to prepare nitrogen-containing activated carbons for supercapacitors

RSC Advances ◽  
2014 ◽  
Vol 4 (73) ◽  
pp. 39037-39044 ◽  
Author(s):  
Tong-Xin Shang ◽  
Ming-Yang Zhang ◽  
Xiao-Juan Jin
Keyword(s):  
Activated Carbons ◽  
Urea Formaldehyde ◽  
Medium Density Fiberboard ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Medium Density ◽  
Resin Adhesive

The urea-formaldehyde resin adhesive in waste medium density fiberboard play a role in modifying the activated carbons.

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