Investigation of crosslinking, mechanical properties and weathering stability of acrylic polyurethane coating reinforced by SiO2 nanoparticles issued from rice husk ash

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).

Section: Introductionmentioning

confidence: 99%

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

Tabish

et al. 2021

Polymers

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“…These findings are consistent with the data reported by Yari et al [18] for the photo-protective effect of nano-SiO 2 on acrylic melamine coating. Moreover, nano-SiO 2 could also react with isocyanate groups [28] to form a tight organic-inorganic hybrid structure, which contributes to preventing the invasion of external environmental factors [29], leading the coating to reduce its degradation effectively. By the presence of 2 wt % T 384 and 1 wt % T 292, the polymer coating is double-protected by the combination of T 384 (as UV absorber) and T 292 (as free radical cleaner).…”

mentioning

confidence: 99%

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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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.

“…It might be assumed that nano-SiO 2 absorbed the harmful incident UV rays, protecting the clearcoat against weathering degradation [49]. In our reported reviews [50], when conducting the curing reaction of acrylic polyols with isocyanate, we found that SiO 2 nanoparticles involved in reaction with isocyanate group to form a tight inorganic-organic hybrid structure. For UV curing systems, the degree of influence of additives depends not only on the content but also on their ability to absorb UV rays and photocatalytic activity.…”

Section: Introductionmentioning

confidence: 63%

“…Conversion of acrylate double bonds in the neat coating (UVAE) and the nanocomposite containing 2.5 wt.% nano-SiO 2 (UVAE/-SiO 2 ) during the UV light exposure process is presented in Figure 4. For the comparative study, we also added the conversion of acrylate double bonds in the acrylate urethane coating (UVAU) [50] in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

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Study on Microstructure and Properties of the UV Curing Acrylic Epoxy/SiO2 Nanocomposite Coating

Dang

Journal of Nanomaterials

et al. 2021

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This study is aimed at exploring the effects of SiO2 nanoparticles on the crosslinking and mechanical and thermal properties of UV curing acrylic epoxy coating. The curing polymerization process and thermal and mechanical properties of UV-curable acrylate epoxy system have been evaluated with or without the presence of SiO2 nanoparticles. To fabricate the UV curing acrylic epoxy/SiO2 nanocomposite coating, nano-SiO2 particles (0.5–5 wt.% by weight of resin) were added in the photo-curable system using sonication for 3 h. Various techniques for characterization have been used, such as FESEM (field emission scanning electron microscope), FTIR (Fourier-transform infrared spectroscopy), TGA (thermogravimetry analysis), gel fraction, and swelling degree analyses. FESEM data indicated that at the content of 2.5 wt.%, nanosilica was homogeneously dispersed in the coating procedure. However, once added 5 wt.%, large aggregation portions were found inside the coating matrices. Surprisingly, nano-SiO2 could play dual roles, as both UV absorbers and nanoreinforcers, in this nanocomposite coating. Besides, data from FTIR, gel fraction, and swelling degree analyses confirmed the role of SiO2 nanoparticles as UV absorbers that reduced the conversion performance of acrylate double bonds, thus increased slightly the swelling degree of coating. In addition, incorporation of SiO2 nanoparticles (as nanofillers, at content of 2.5 wt.%) in the polymer matrix enhanced significantly the abrasion resistance and thermal stability of the coating, by 60% (from 98.3 to 158.4 lite/mil) and 9°C (from 348°C to 357°C), respectively.