Preparation and UV aging of nano-SiO2/fluorinated polyacrylate polyurethane hydrophobic composite coating

Yu, Fuying; Gao, Ju; Liu, Canpei; Chen, Yaokun; Zhong, Gang; Hodges, Chris; Chen, Mingfeng; Zhang, Huagui

doi:10.1016/j.porgcoat.2020.105556

Cited by 59 publications

(30 citation statements)

References 39 publications

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“…However, silica nanoparticles seem to slow down this phenomenon. This beneficial effect of silica nanoadditions against UVB weathering has previously been reported by other authors [ 48 , 49 ]. The nanosilica particles have been suggested to protect the matrix by absorbing UVB photons and converting them into heat [ 50 ] or by scattering the UVB rays [ 51 ].…”

Section: Resultssupporting

confidence: 86%

Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica

et al. 2020

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Polyamide coatings are thermoplastics with great advantages such as a good corrosion protection of the base metal and wear resistance. Their application as powder coatings is an environmentally friendly option that is currently attracting growing interest. However, during their life service, they can sometimes be exposed to conditions that they are unable to stand. In this work, a polyamide 11 (PA11) powder was reinforced with different percentages of silica nanoparticles (1–3 wt. %). Powder mixtures were prepared through extrusion followed by compression molding processes to manufacture coatings. For the coatings under study, the effect of 500 h xenon exposure was studied in order to know their ultraviolet (UV) resistance. Attenuated total reflection-Fourier transform infrared spectroscopy (FTIR-ATR) and differential scanning calorimetry (DSC) tests were performed to study changes in polymer structure and if they are affected by nanoparticles. The effect of nanoadditions and xenon exposure on hardness and stiffness were also evaluated. Furthermore, reciprocal wear tests were performed before and after irradiation, and the wear tracks were analyzed using optoelectronic microscopy and scanning electron microscopy (SEM). Finally, the aesthetic properties were measured. The results reveal improvements in mechanical and wear properties when 1% nanosilica is added to the PA11, which then become more relevant after xenon radiation exposure.

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Section: Resultssupporting

confidence: 86%

Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica

et al. 2020

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“…The non-exposed, plain epoxy coatings (AR and 0%) show a high initial gloss, while this gloss gradually decreases with the amount of added silica nanoparticles. These decreases in the gloss due to nanosilica have already been reported by other authors [28,60] and are usually related to microstructural or textural changes in the coating surface [23].…”

Section: Aesthetic Propertiessupporting

confidence: 79%

“…1) relates to silica nanoparticles. It can be seen that the 1110 cm À1 band increases its intensity with nanoadditions, confirming a correct incorporation of SiO 2 in the epoxy coatings [28]. Moreover, the complete disappearance of the epoxide band (oxirane ring present in the raw epoxy powders [33]) at 916 cm À1 [40,41] indicates a complete curing process of the epoxy resin for all coatings.…”

Section: Physical and Chemical Characterizationmentioning

confidence: 53%

“…This increased durability against UV light in these coatings has been attributed to the fact that nanosilica absorbs UV radiation [30]. The positive effect of those additions on the gloss of UV exposed polyacrylate polyurethane coatings have also been shown [28], while a slight negative effect on the color of UV-A exposed latex films [26] has been reported. The addition to certain epoxy resins do not affect whiteness of UV exposed coatings [29].…”

Section: Introductionmentioning

confidence: 90%

“…This loss of gloss due to ultraviolet exposure is very common. Nanoparticles are not able to improve gloss loss of epoxy coatings, although in other cases, SiO 2 nanoparticles can positively affect [28].…”

Section: Aesthetic Propertiesmentioning

confidence: 97%

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Performance of ultraviolet exposed epoxy powder coatings functionalized with silica by hot mixing

2021

Focus on Powder Coatings

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The effect of hydrophilic nanosilica additions on the (1e3% by wt.) mechanical performance of epoxy powder coatings after UV exposure was investigated in this study. The epoxy coatings were prepared by mixing a commercial epoxy powder with nanoparticles in a hot mixer, an alternative method that is simpler than extrusion. Powders were electrostatically applied on carbon steel and cured to obtain coatings. The epoxy-based coatings were exposed to a xenon lamp with an irradiance of 550 W$m À2 for 500 h. Chemical structure of coatings was characterized before and after xenon exposure, using an attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). Glass transition temperature (T g ) was measured with differential scanning calorimetry (DSC). Mechanical and wear tests were performed in order to study the difference among the coatings without and with silica nanoparticles after UV exposure. Surface of the coatings was analyzed with scanning electron microscopy (SEM), as well as the wear tracks to assess the wear mechanism. Finally, aesthetic properties (gloss and color) were also evaluated. The results confirm that the use of SiO 2 nanoparticles in amounts up to 2% allows less chemical and physical degradation of the surfaces and better wear resistance than the plain epoxy coatings after xenon exposure was found for 1% coating.

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Hyperspectral and Weather Resistant Biomimetic Leaf Enabled by Interlayer Confinement

Yang,

Liu,

Liu

et al. 2024

Adv Funct Materials

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Mimicking the characteristics and achieving specific functions of biological systems is stirring but challenging. Generally, pigments in the commercial coating can only achieve a similarity in chromaticity, while cannot obtain a similarity in the solar reflective spectrum whose difficulty resides in simulating spectral characteristics simultaneously. Unfortunately, traditional organic pigments show poor weather and heat resistance. Herein, with the little difference in the color difference (ΔEab*), the high spectral similarity, as well as adjustable green peak and similar red edge slope compared with the common plants (pagoda tree leaf, etc.) in 400–2500 nm, is also attained. It is achieved by the interlayer confined organic pigment in Mg/Al‐layered double hydroxide (Mg/Al‐LDH) layers. The corresponding biomimetic leaf displays high hyperspectral performance with a spectral angle cosine of 0.9922 and heat resistance at 120 °C. The longer weather resistance than that of mechanical mixing is also demonstrated. The intercalated chromophores of sodium copper chlorophyllin in the Mg/Al‐LDH and the interlayer confinement of Mg/Al‐LDH contribute to the excellent performance. This work provides a green pigment and a biomimetic leaf requiring the same chromaticity and spectrum as green plants, filling the long‐term use demand gap for heat and weather‐resistant biomimetic vegetation.

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Preparation and UV aging of nano-SiO2/fluorinated polyacrylate polyurethane hydrophobic composite coating

Cited by 59 publications

References 39 publications

Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica

Manufacturing and Characterization of Coatings from Polyamide Powders Functionalized with Nanosilica

Performance of ultraviolet exposed epoxy powder coatings functionalized with silica by hot mixing

Hyperspectral and Weather Resistant Biomimetic Leaf Enabled by Interlayer Confinement

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