scholarly journals PHYSICAL AND MECHANICAL PROPERTIES OF PARTICLEBOARD FROM Eucalyptus grandis PRODUCED BY UREA FORMALDEHYDE RESIN WITH SiO2 NANOPARTICLES

2020 ◽  
Vol 40 (3) ◽  
pp. 289-293
Author(s):  
Ana C. M. Valle ◽  
Bruno S. Ferreira ◽  
Glaucia A. Prates ◽  
Danielle Goveia ◽  
Cristiane I. de Campos
Keyword(s):  
Mechanical Properties ◽  
Urea Formaldehyde ◽  
Eucalyptus Grandis ◽  
Physical And Mechanical Properties ◽  
Sio2 Nanoparticles ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin

STUDY OF THE INFLUENCE OF STABILIZERS ON THE PROPERTIES OF CARBAMIDE FOR-MALDEHYDE BINDER AND FC PLYWOOD

2020 ◽  
Vol 10 (1) ◽  
pp. 136-143
Author(s):  
A. Fedotov ◽  
Tat'yana Vahnina ◽  
Andrey Titunin ◽  
Aleksandr Sviridov
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Strength Reduction ◽  
Cohesive Strength ◽  
Urea Formaldehyde Resin ◽  
Strength Characteristics ◽  
Formaldehyde Resin ◽  
Glycerol Mono

The problem of stabilizing the properties of the urea-formaldehyde binder during storage is relevant for both glued products and resins. Changing the performance of the resin during storage makes it difficult to apply a binder and leads to a deterioration in the physical and mechanical properties of plywood. The effect of glycerol, mono- and triethanolamine, as well as a mixture of glycerol and monoethanolamine on the nominal viscosity of the resin after 56 days of storage, has been studied. The use of glycerol and monoethanolamine (including in the complex) reduces the nominal viscosity of the resin by 13.5-24.8%. The use of triethanolamine as a stabilizer makes it possible to reduce the nominal viscosity by 35% in comparison with the index of an unstabilized oligomer. Mechanical properties of FC plywood based on the stabilized and unstabilized binder has been studied. It was found that glycerol additive (or glycerol in combination with monoethanolamine) significantly reduces strength characteristics of plywood, which makes it irrational to use these stabilizers. The addition of 0.2% triethanolamine to CFS allows a 35% reduction in the nominal viscosity of the resin, while the cohesive strength of the binder decreases by 1.5%. The result is within the framework of the dispersion of the indicator, i.e. strength reduction is negligible. The static bending strength of plywood with a stabilized triethanolamine binder is more important than that of control specimens without the addition of stabilizers. The results of the study enable to recommend the addition of triethanolamine in an amount of 0.2% by weight of urea-formaldehyde resin as a rational stabilizer

scholarly journals Effects of the thickness of rotary-cut veneers on properties of plywood sheets. Part 2. Physical and mechanical properties of plywood materials

2012 ◽  
Vol 52 (No. 3) ◽  
pp. 118-129
Author(s):  
J. Hrázský ◽  
P. Král
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Bending Strength ◽  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Institutional Research ◽  
Nominal Thickness

The second part of the paper summarizes results of an institutional research aimed at the determination of physical and mechanical properties of different sets of plywood sheets pressed under different conditions. The first part dealt with the determination of compressibility or values of decreasing the thickness of pressed plywood sheets. In this second part, results are summarized of the analysis of physical and mechanical properties of the set of whole-beech plywood sheets of the nominal thickness of veneers amounting to 1.5 mm. The plywood sheets were manufactured as seven-ply and urea-formaldehyde resin DUKOL S was used for their production. The sheets were pressed using a pressure of 1.5 and 1.7 MPa. Following parameters were analyzed: moisture, density, bending strength, MOE in bending and shear strength.

Glutardialdehyde Modified Corn Starch – Urea Formaldehyde Resin as a Binder for Particleboard Making

2015 ◽  
Vol 754-755 ◽  
pp. 89-93 ◽  
Author(s):  
M.H.M. Amini ◽  
R. Hashim ◽  
N.S. Sulaiman ◽  
S. Hiziroglu ◽  
Othman Sulaiman ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elasticity Modulus ◽  
Corn Starch ◽  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Urea Formaldehyde Resin ◽  
Modulus Of Rupture ◽  
Formaldehyde Resin ◽  
Japanese Industrial Standard ◽  
Internal Bonding Strength

The objective of the study was to characterize and to evaluate physical and mechanical properties of experimental particleboard panels made from rubberwood (Heveabrasiliensis) using modified starch-urea formaldehyde as binder. Panels were manufactured using 13% corn starch modified with glutardialdehyde with addition of 2 % urea formaldehyde resin and tested for their physical and mechanical properties. All of the particleboards satisfied the Japanese Industrial Standard which required 2000 N/mm2, 8.0 N/mm2and 0.15 N/mm2for modulus of elasticity, modulus of rupture and internal bonding strength, respectively. The mechanical properties were comparable to those made using 15 % urea formaldehyde resin with reduction of formaldehyde fume was over 50 %.

scholarly journals Physical and Mechanical Properties of Binderless Particleboard Made from Steam-Pretreated Oil Palm Trunk Particles

2019 ◽  
Vol 3 (2) ◽  
pp. 46 ◽  
Author(s):  
Jia Geng Boon ◽  
Rokiah Hashim ◽  
Mohammed Danish ◽  
Wan Noor Aidawati Wan Nadhari
Keyword(s):  
Mechanical Properties ◽  
Oil Palm ◽  
Chemical Constituents ◽  
Starch Content ◽  
Urea Formaldehyde ◽  
Health And Safety ◽  
Physical And Mechanical Properties ◽  
Steam Pretreatment ◽  
Formaldehyde Resin ◽  
Oil Palm Trunk

Formaldehyde emissions from conventional particleboards raise issues of health and safety. One of the potential solutions is binderless particleboards made without using synthetic adhesives. However, the physical and mechanical properties of untreated binderless particleboards are relatively poor compared to conventional particleboards. This research aims to reveal the potential of using steam pretreatment to improve binderless particleboard properties made from oil palm trunk. The oil palm trunk particles were treated with steam pretreatment for different durations of time (20, 40, 60 min). The chemical constituents of the treated and untreated particles were evaluated. The binderless particleboards were made from treated and untreated particles. In addition, panels using untreated oil palm trunk particles with 10% urea–formaldehyde resin were made and used as a comparison. The boards were evaluated according to European Standards. The results indicated that the hemicellulose and starch content gradually reduced with the progression of steam pretreatment. The physical and mechanical properties were improved by increasing steam pretreatment duration. The steam pretreatment was able to improve the properties of binderless particleboards made from oil palm trunk. However, the performance of steam-pretreated binderless particleboard in this study is not compatible with the particleboards made using 10% urea–formaldehyde.

Improving the Thickness-Swelling (TS) of Castor-Stalk Based Panel

2011 ◽  
Vol 183-185 ◽  
pp. 2095-2099
Author(s):  
Xiao Ping Li ◽  
Ding Guo Zhou ◽  
Si Qun Wang
Keyword(s):  
Mechanical Properties ◽  
Castor Oil ◽  
Urea Formaldehyde ◽  
Urea Formaldehyde Resin ◽  
People’S Republic Of China ◽  
Formaldehyde Resin ◽  
People's Republic Of China ◽  
Thickness Swelling ◽  
Republic Of China

Castor-oil stalk is one kind of excellent woody materials, and the thickness swelling ( TS ) of the castor-oil stalk based panel with Urea- formaldehyde resin ( UF ) cannot meet the requirement of the Standard of People’s Republic of China. the TS of the panel was improved with wax emulsion.Results showed that the mechanical properties and the TS of the particle panels were improved as the wax emulsion loading increased. The TS of castor stalk based particle boards and fiber boards can meet the requirement of standard of PRC when 1.44 and 1.2 wt% wax emulsion, respectively, was added.

scholarly journals Decreasing Formaldehyde Emission from Particleboard Panels Fabricated by Adding Newly Phenolic Compounds as a Scavenger to Urea Formaldehyde Resin

2021 ◽  
Author(s):  
behzad kord ◽  
Farnaz Movahedi ◽  
Laleh Adlnasab ◽  
Nadir Ayrilmis
Keyword(s):  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Formaldehyde Emission ◽  
Chromotropic Acid ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Alizarin Red ◽  
Alizarin Yellow ◽  
Dry Conditions ◽  
Manufacturing Parameters

Abstract This study focused on the influence of some novel scavengers on the physical, mechanical, and formaldehyde emission of particleboard produced with urea-formaldehyde resin. Three different scavengers, alizarin red sulfonate, alizarin yellow-GG, and chromotropic acid, were incorporated to the UF resin at 1, 3, 5, and 7% (by weight) loading levels based on the oven-dried weight of the resin. Other manufacturing parameters were kept constant in the producrion of particleboards. The results indicated that the formaldehyde emission of the particleboards significantly reduced with increasing amount of the scavengers. The lowest formaldehyde emission was found in the specimens containing alizarin red sulfonate (0.38 mg/l), followed by chromotropic acid (0.43 mg/l), and alizarin yellow-GG (0.49 mg/l), respectively, at 7 wt% loading level of the scavengers. Although the physical and mechanical properties of the particleboards decreased with the increasing content of the scavengers, they met the requirements of particleboards for interior fitments (including furniture) for use in dry conditions (P2 grade) of EN 312 standard. According to the results of technological properties and formaldehyde emission of the particleboards, it can be said that alizarin red sulfonate is the best scavenger among the investigated scavengers.

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