scholarly journals The Effect of Silica-Filler on Polyurethane Adhesives Based on Renewable Resource for Wood Bonding

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2177
Author(s):  
Mariusz Ł. Mamiński ◽  
Anna M. Więcław-Midor ◽  
Paweł G. Parzuchowski
Keyword(s):  
Bonding Strength ◽  
Beech Wood ◽  
Renewable Resource ◽  
Work Of Adhesion ◽  
Silica Filler ◽  
Reinforcing Agent ◽  
Wood Bonding ◽  
Polyurethane Adhesives ◽  
And Performance ◽  
Gelling Time

The aim of the study was to evaluate the applicability and performance of polyglycerol- and sucrose-based polyols as components of a simplified formulation of polyurethane adhesives. Colloidal silica was used as a viscosity control and reinforcing agent. The adhesives were examined in terms of reactivity, thermal stability, viscosity, work of adhesion, wetting, surface energy, and bonding strength on wooden substrates. Silica was found to increase gelling time, but markedly improved bonding strength and adhesion with substrates. Bonded solid beech wood samples prepared at 80, 110, and 130 °C showed shear strengths between 7.1 MPa and 9.9 MPa with 100% wood failure. The renewable resource-based polyols were demonstrated to be useful in formulation of polyurethane adhesives for furniture industry—especially with silica as a filler.

scholarly journals The Interfacial Characterization and Performance of Cu/Al-Conductive Heads Processed by Explosion Welding, Cold Pressure Welding, and Solid-Liquid Casting

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 237 ◽  
Author(s):  
Yanni Wei ◽  
Hui Li ◽  
Fu Sun ◽  
Juntao Zou
Keyword(s):  
Corrosion Resistance ◽  
Bonding Strength ◽  
Explosive Welding ◽  
Slag Inclusion ◽  
Explosion Welding ◽  
Bonding Interface ◽  
Pressure Welding ◽  
And Performance ◽  
Solid Liquid ◽  
Cold Pressure

The Cu/Al composites conductive head is widely used in hydrometallurgy as the core component of cathode plate. Its conductive properties directly affect the power consumption, and the bonding strength and corrosion resistance determine the conductive head service life. The Cu/Al conductive head prepared by explosion welding, cold pressure welding, and solid-liquid casting methods were investigated in this paper. The interface microstructure and compositions were examined by scanning electron microscope and X-ray energy dispersive spectrometry. The bonding strength, interface conductivity, and the corrosion resistance of three types of joints were characterized. The Cu/Al bonding interface produced by explosive welding presented a wavy-like morphology with typical defects and many of brittle compounds. A micro-interlocking effect was caused by the sawtooth structures on the cold pressure welding interface, and there was no typical metallurgical reaction on the interface. The Cu/Al bonding interface prepared by solid-liquid casting consisted mainly of an Al-Cu eutectic microstructure (Al2Cu+Al) and partial white slag inclusion. The thickness of the interface transition layer was about 200–250 µm, with defects such as holes, cracks, and unwelded areas. The conductivity, interfacial bonding strength, and corrosion resistance of the conductive head prepared by explosive welding were superior to the other two.

Selection of Reinforcing Agent in Metal Composite Matrix and Study of its Particle Composition

2019 ◽  
Vol 945 ◽  
pp. 476-481
Author(s):  
M.N. Safonova ◽  
A.A. Fedotov ◽  
A.S. Syromiatnikova
Keyword(s):  
Materials Science ◽  
Natural Diamond ◽  
Metal Composite ◽  
Metal Base ◽  
Particle Composition ◽  
Reinforcing Agent ◽  
Materials Science And Engineering ◽  
And Performance ◽  
Actual Target ◽  
Selection Of

The problem of creation of new materials and performance characteristics increasing of known matrix composite alloys is an actual target of research in materials science and engineering. It is known that the application of dispersed fillers, including ultra-and nanoscale dimensionality materials in the composites is an effective way to solve this problem. The article describes the feasibility of application ultradisperse powders of natural diamond as a reinforcing agent instead of synthetic in composite materials on a metal base and study of its particle composition.

Veneer Material and Facing Technology of Wheat Straw

2010 ◽  
Vol 113-116 ◽  
pp. 2072-2076 ◽  
Author(s):  
Bing Liu ◽  
Feng Hu Wang ◽  
An Ying Jiao ◽  
Xiao Dong Zhu ◽  
Jian Ping Sun
Keyword(s):  
Wheat Straw ◽  
Bonding Strength ◽  
Raw Material ◽  
Composite Panel ◽  
Furniture Manufacturing ◽  
Decorative Material ◽  
Art Design ◽  
And Performance ◽  
Pretreated Wheat Straw

A new kind of bio-based composite panel with veneer material and performance of decorative material was produced by process of dissection, staining, weaving and collage. The bio-based composite panel was instructed with art design using the wheat straw as raw material. The facing technology of the bio-based composite panel with wheat straw veneer material was investigated and no previous research using pretreated wheat straw to produce the veneer material with characteristic of decorative function. The bonding strength was measured and it reached 0.75 MPa. It is demonstrated that pretreated wheat straw can be used for furniture manufacturing and decorative applications directly.

Green Polyurethane Adhesives for Wood Bonding

2015 ◽  
Vol 1115 ◽  
pp. 331-336
Author(s):  
M.A.F. Amran ◽  
Ernie Suzana Ali
Keyword(s):  
Untreated Wood ◽  
Adhesive System ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Lap Shear ◽  
Lap Shear Test ◽  
Wood Joint ◽  
Wood Bonding ◽  
Polyurethane Adhesives ◽  
The Fourier Transform

The Green polyurethane adhesive system was prepared using two types palm oil polyol having different molecular weight ~1100 (GA) and ~ 2200 (GB) respectively, 4-4-diphenylmethane diisocyanate (MDI) and nanoclay fillers via in-situ process. Adhesives were applied on both sides of two untreated wood substrate using brushing technique for lap shear test. The attached substrate then undergoes the curing process for 24 hours at room temperature with relative humidity of 50±5%. The disappearance of NCO peak in the Fourier transform infra-red (FTIR) spectrum showed that MDI has completely reacted to form PU. Contact angle measurement proved that high wetting condition obtains from green polyurethane (PU) adhesive. PU adhesive wood joint improved in shear strength with addition of 1wt% nanoclay for both green polyol.

Research on Synthesis and Performance of Solvent-Free Aluminum-Plastic Composite Polyurethane Adhesive

2012 ◽  
Vol 583 ◽  
pp. 9-13 ◽  
Author(s):  
Qing Wang ◽  
Guang Xue Chen ◽  
Shuang Lian Chen ◽  
Jing Lei Tai ◽  
Qi Feng Chen
Keyword(s):  
Water Resistance ◽  
Raw Materials ◽  
Peel Strength ◽  
Solvent Free ◽  
Polyurethane Adhesive ◽  
Low Viscosity ◽  
Plastic Composite ◽  
Comprehensive Properties ◽  
Polyurethane Adhesives ◽  
And Performance

A low-viscosity and solvent-free polyurethane adhesive was prepared with mixed polyester, polyether and IPDI as main raw materials. The influences of different moral ratios of polyester and polyether on reaction time, viscosity and water resistance, adhesive strength were researched. The effects of catalysts to adhesive were well discussed. The experimental results showed that polyurethane adhesives composed by mixed polyester and polyether had low viscosity and had better waterproof quality. The adhesives showed the best comprehensive properties when the mole ratio of OHs of polyether to OHs of polyester was 0.3/0.7. Catalysts added to this adhesive could speed the curing reaction, but it reduced the peel strength of the adhesives.

Wood bonding strength sensitivity estimation and power consumption prediction in wood machining process by artificial intelligence methods

Sensor Review ◽  
2017 ◽  
Vol 37 (4) ◽  
pp. 444-447 ◽  
Author(s):  
Srdjan Jovic ◽  
Zoran Golubovic ◽  
Jovan Stojanovic
Keyword(s):  
Artificial Intelligence ◽  
Power Consumption ◽  
Bonding Strength ◽  
Machining Process ◽  
Feed Speed ◽  
Content Type ◽  
Artificial Intelligence Methods ◽  
Sensitivity Estimation ◽  
Wood Bonding ◽  
Wood Machining

Purpose The paper aims to present an investigation of wood bonding strength as a very important indicator for effective using in further manufacturing processes. Design/methodology/approach In this study, the wood bonding strength sensitivity was estimated based on grain orientation, feed speed, heating time and temperature, temperature and type of adhesive. Artificial intelligence methods were applied for this analysis because it is strongly a nonlinear process. Findings It was shown that the artificial intelligence tools could be useful, reliable and effective for the wood bonding strength sensitivity estimation. Afterwards the power consumption in in solid wood machining process is analyzed and estimated by the artificial intelligence tools. Originality/value Results shown that the wood bonding strength is the most sensitive for type of adhesive. Thus, the results of the present research can be successfully applied in the wood industry to reduce the time, energy and high experimental costs.

scholarly journals The effect of ageing on bonding performance of plasma treated beech wood with urea-formaldehyde adhesive

Cellulose ◽  
2021 ◽  
Author(s):  
Jure Žigon ◽  
Jaša Saražin ◽  
Milan Šernek ◽  
Janez Kovač ◽  
Sebastian Dahle
Keyword(s):  
Plasma Treatment ◽  
Evaluation System ◽  
Negative Impact ◽  
Urea Formaldehyde ◽  
Beech Wood ◽  
Wood Adhesive ◽  
Lap Joints ◽  
Adhesive Joints ◽  
Bonding Performance ◽  
Wood Bonding

AbstractIn the process of wood bonding, the usage of aged and inactivated wooden elements can cause a reduction in mechanical properties of products containing wood-adhesive joints. Treating wood with an atmospheric air plasma represents a sophisticated technique for surface activation. With this regard, to enhance the bondability of normal beech wood (Fagus sylvatica L.) with urea-formaldehyde (UF) adhesive, a dielectric barrier discharge plasma in floating electrode configuration was implemented. In this study, fresh and aged wood specimen both, untreated and plasma treated, were investigated. X-ray photoelectron spectroscopy revealed promotion of carbon-rich species with ageing, but generation of a new functional oxygen-containing functional groups after plasma treatment. Microscopic observations with scanning electron microscope showed no obvious changes in the wood structure after plasma treatment. Surface oxidation consequently improved the wettability of the wood surface with water and UF adhesive. However, this enhanced wettability slightly diminished over time. As shown with dynamic mechanical analysis, the rheological properties of the UF adhesive in wood-adhesive joints were not affected by aging nor by plasma treatment. The positive influence of plasma treatment and negative impact of substrate ageing to the shear strengths of wood lap-joints were determined using an automated bonding evaluation system. Similarly, the negative effect of wood ageing and the positive effect of plasma pre-treatment were reflected in the bending strengths of the produced laminated veneer lumbers. Results showed that plasma treatment of beech wood improves the bonding performance of both fresh and aged wood. Graphic abstract

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