Abstract:Acrylic based polyurethane (PU) coatings with various amounts of nanosilica contents were prepared using solution casting method. The nanosilica (SiO2) particles used are around 16 nm in diameter. The friction and wear test was conducted using the reciprocating wear testing machine. The tests were performed at rotary speed of 100 rpm and 200 rpm with load of 0.1 kg to 0.4 kg under 1 N interval. The effect of the PU/nano-SiO2composite coating on friction and wear behavior of polypropylene substrate was investig… Show more
“…2 From this perspective, the chance to actually obtain enhanced performance by combining the features of organic and inorganic components has already attracted considerable interest within coatings science and technologies. 5…”
In an attempt to improve the puncturing behavior of a commercial technical textile, this study investigated the effects of fabric impregnation with waterborne polyurethane dispersions (WPUDs). The infusing solutions were prepared by mixing a commercially available WPUD with other components, such as water, hydrophilic and hydrophobic silica (SiO2) nanoparticles, and a crosslinker. Quasi-static perforation tests were performed on a dynamometer machine equipped with a spherical spike and pointed blade as piercing probes. The results showed that the polyurethane impregnation augmented the puncture performances of the treated textiles. Then, further improvements in the spike and blade strength of the impregnated fabrics were obtained by adding hydrophilic silica nanoparticles and crosslinker into WPUDs, respectively. No effect of silica functionalization (hydrophilic or hydrophobic) has been verified on the mechanical features of the respective treated samples for the tested filler contents of 3% and 5% in wt. The best fabric features (blade strength increase of +63% and puncture strength increase of +71% compared to the neat material) were obtained by combining the two additives, nano SiO2 and crosslinker, into the polyurethane. The performances of these last systems were also superior to those obtained by doubling the amount of polymeric dispersion applied to the neat materials. The discussion of the results was supported by electron scanning microscopy, infrared spectroscopy, and further measurements of the cutting resistance. Finally, the mass per unit area of the substrate for the impregnated samples was measured in order to assess weight gain due to treatment.
“…2 From this perspective, the chance to actually obtain enhanced performance by combining the features of organic and inorganic components has already attracted considerable interest within coatings science and technologies. 5…”
In an attempt to improve the puncturing behavior of a commercial technical textile, this study investigated the effects of fabric impregnation with waterborne polyurethane dispersions (WPUDs). The infusing solutions were prepared by mixing a commercially available WPUD with other components, such as water, hydrophilic and hydrophobic silica (SiO2) nanoparticles, and a crosslinker. Quasi-static perforation tests were performed on a dynamometer machine equipped with a spherical spike and pointed blade as piercing probes. The results showed that the polyurethane impregnation augmented the puncture performances of the treated textiles. Then, further improvements in the spike and blade strength of the impregnated fabrics were obtained by adding hydrophilic silica nanoparticles and crosslinker into WPUDs, respectively. No effect of silica functionalization (hydrophilic or hydrophobic) has been verified on the mechanical features of the respective treated samples for the tested filler contents of 3% and 5% in wt. The best fabric features (blade strength increase of +63% and puncture strength increase of +71% compared to the neat material) were obtained by combining the two additives, nano SiO2 and crosslinker, into the polyurethane. The performances of these last systems were also superior to those obtained by doubling the amount of polymeric dispersion applied to the neat materials. The discussion of the results was supported by electron scanning microscopy, infrared spectroscopy, and further measurements of the cutting resistance. Finally, the mass per unit area of the substrate for the impregnated samples was measured in order to assess weight gain due to treatment.
“…51 The surface roughness will be increased by increasing SiO 2 content in the matrix from 3 to 7 wt.%. 102 Figure 13.Effect of the applied load on the wear rate of various composites containing nano-silica. 102 PP: polypropylene; PU: polyurethane.…”
Offshore pipelines are vulnerable against erosion/wear deterioration mechanisms that can be controlled through the use of proper surface coatings, such as polymer matrix nano-composite (PMNC) coatings that are well-known for their ease of production, availability and applicability. Epoxy, as a versatile rigid and brittle resin and polyurethane with proper chemical/mechanical properties, are potential candidates to make the matrix of these composites. A combination of these polymers can also enhance the mechanical behaviors, glass transition temperature and flexibility. In addition, the desired coating characteristics, such as adhesion to metal substrate, mechanical properties, erosion/wear resistivity and UV absorbance, can be further improved through the addition of appropriate nanoparticles within the polymer matrix. Especially, nanoparticles can improve the erosion/wear resistance of polymers because of establishing high strength bonds between the polymer chains and the reinforcements besides enhancing other required properties. The present work is a review on PMNC coatings that contain epoxy, polyurethane or EP/polyurethane as a polymer matrix along with the details of the nanoparticle reinforcements, such as alumina, silica, titanium oxide, zinc oxide, clay and carbon-based materials. The effect of these nanoparticles on the properties of composite coatings has also been investigated.
“…The study of [41] revealed that the additions of nano-SiO 2 in the polymer coating could enhance the abrasion and scratch resistance, hardness and strength. Moreover, other nanoparticles such as SiC, ZrO 2 , ZnO, Al 2 O 3 , and TiO 2 were also used for the enhancement of the coating properties [45,46,47]. Kotnarowska et al [46] evaluated the performance of the unmodified epoxy-polyurethane coating and epoxy-polyurethane coatings modified with silica or alumina nanoparticles over three years.…”
Section: Nanotechnology Applications In Transportation Vehiclesmentioning
confidence: 99%
“…Several studies [20,47,51,52] have indicated that the addition of nanoparticles in coatings tremendously improves the scratch and abrasion resistant over a longer period. However, for the optimal benefits, there is a need to select the appropriate proportion of nanoparticles in polymer coatings [47,53]. Ching and Syamimie [47] performed experiments to evaluate the optimal proportion of nano-silica in coatings for higher abrasion resistance.…”
Section: Nanotechnology Applications In Transportation Vehiclesmentioning
confidence: 99%
“…However, for the optimal benefits, there is a need to select the appropriate proportion of nanoparticles in polymer coatings [47,53]. Ching and Syamimie [47] performed experiments to evaluate the optimal proportion of nano-silica in coatings for higher abrasion resistance. For these purposes, tests using 0 wt%, 3 wt% and 7 wt% of nano-SiO 2 in the polyurethane coating were conducted.…”
Section: Nanotechnology Applications In Transportation Vehiclesmentioning
Nanotechnology has received increasing attention and is being applied in the transportation vehicle field. With their unique physical and chemical characteristics, nanomaterials can significantly enhance the safety and durability of transportation vehicles. This paper reviews the state-of-the-art of nanotechnology and how this technology can be applied in improving the comfort, safety, and speed of transportation vehicles. Moreover, this paper systematically examines the recent developments and applications of nanotechnology in the transportation vehicle industry, including nano-coatings, nano filters, carbon black for tires, nanoparticles for engine performance enchantment and fuel consumption reduction. Also, it introduces the main challenges for broader applications, such as environmental, health and safety concerns. Since several nanomaterials have shown tremendous performance and have been theoretically researched, they can be potential candidates for applications in future environmental friendly transportation vehicles. This paper will contribute to further sustainable research and greater potential applications of environmentally friendly nanomaterials in healthier transportation vehicles to improve the transportation industry around the globe.
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