The role of organic and inorganic UV-absorbents on photopolymerization and mechanical properties of acrylate-urethane coating

2020

J. Compos. Sci.

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This study aims to evaluate the synergical effects of SiO2 nanoparticles (nano-SiO2) and organic photostabilizers (Tinuvin 384 (T384) and Tinuvin 292 (T292)) on the weathering resistance of acrylic polyurethane coating. Data obtained from infrared (IR), field emission scanning electron microscopy (FESEM), and weight loss of coatings (before and after aging test), suggest that the SiO2 nanoparticles play a dual role, as both reinforcer and UV absorber, thus improving effectively both the mechanical properties and the weathering resistance of polyurethane acrylic coatings. The nanocomposite coating containing 2 wt % nano-SiO2, 2 wt % T384, and 1 wt % T292 exhibits excellent weathering and abrasion resistances, offering a durable outdoor application.

Section: Introductionmentioning

confidence: 97%

The Synergistic Effects of Sio2 Nanoparticles and Organic Photostabilizers for Enhanced Weathering Resistance of Acrylic Polyurethane Coating

2020

J. Compos. Sci.

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“…In recent decades, inorganic nanoparticles have been considered as the essential additives to enhance the properties or provide new/multifunctional properties to organic and various nanocoatings [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Nanoparticles have attracted considerable research interest due to their unique properties, arising from the quantum confinement effect and very large surface-to-volume ratios.…”

Section: Introductionmentioning

confidence: 99%

Water-Borne ZnO/Acrylic Nanocoating: Fabrication, Characterization, and Properties

Tabish

et al. 2021

Polymers

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This work aims to explore how ZnO nanoparticles enhance the mechanical, photoaging, and self‑cleaning properties of water‑borne acrylic coating. Micro/nano‑ZnO particles (at 2 wt.% of total solid resin) were dispersed into the acrylic polymer matrices using ultrasonication to understand the effect of the size of the coating properties. The effect of ZnO particles on the properties of composite coatings (25 µm of thick) have been evaluated through various tests, such as abrasion measurement, ultraviolet/condensation (UV/CON) weathering aging, and methylene blue self‑cleaning. Experimental data indicated that the incorporation of ZnO particles enhanced both abrasion resistance and methylene blue removal efficiency of the water‑borne acrylic coatings, with nano‑ZnO particles being the best. However, the weathering degradation of nanocomposite coatings was more severe as compared to the coating with micro‑ZnO (at the same ZnO content).

“…FTIR Spectrum Analysis. A decrease of characteristic IR absorption bands of acrylate groups during the crosslinking reaction is quantitatively studied according to the method described in previous papers [23,34] by using a FTIR spectroscopy Nicolet iS10 (USA).…”

Section: Characterizationsmentioning

confidence: 99%

“…Fe 3 O 4 -Ag hybrid nanoparticles, despite a strong UV absorption, their low content (0.1 wt%) might not significantly affect the kinetics of curing reaction [23]. The organic UV absorber T384 reduced the efficiency of double bonds while nanoparticles absorb UV anatase TiO 2 and ZnO increased the conversion of the acrylate groups of the system due to strong photocatalytic activity [34].…”

Section: Introductionmentioning

confidence: 99%

Crosslinking, Mechanical Properties, and Antimicrobial Activity of Photocurable Diacrylate Urethane/ZnO-Ag Nanocomposite Coating

Adsorption Science & Technology

et al. 2021

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In this article, ZnO-Ag nanohybrids were chemically synthesized in the aqueous medium by reducing silver nitrate with sodium borohydride NaBH4. These nanohybrids were then homogeneously dispersed into the diacrylate urethane/1,6-hexanediol diacrylate resin system at a content of 2 wt%. The structural morphology, mechanical resistances, and crosslinking of the as-prepared nanocomposite coating (nanocoating) were evaluated. The antimicrobial characteristic was tested by keeping track of the lag-log growth phase of E. coli bacteria in the coating existence among cell cultures. The obtained data indicated that the nanohybrids added into the UV curing diacrylate urethane matrices had significantly increased the abrasion resistance, relative hardness, and conversion of the acrylate groups of the nanocoating. In addition, the antibacterial test revealed that the nanocoating had good antibacterial property against E. coli, whereas for the pure coating (without ZnO-Ag nanoparticles), there was no antibacterial activity observed.