Enhanced near-infrared reflectance and functional characteristics of nano metal oxide embedded alkyd coatings

Abstract

The main idea of the research is to formulate alkyd based smart coatings with high NIR-reflectance to decrease the cooling load in order to maintain cool comfort in buildings. In addition to the NIR reflectance studies, the physical characteristics of the coating such as glossiness, hiding power, spreading area, volatile organic contents are evaluated. Heat reflective coatings are prepared by ball milling technique utilizing white metal oxide nanoparticles (NPs) titanium oxide (TiO2), zinc oxide (ZnO) and zirconium oxide (ZrO2) as pigments. The X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) results reveal the prepared metal oxide pigments are of high purity. Bonding interaction between the alkyd resin and the NPs are studied using Fourier transform infrared spectroscopy (FTIR).The spectral reflectance of the prepared coatings are measured using spectrophotometer in the solar spectrum range, wherein ZnO based nanocoatings shows better results. The cool comfort is measured for ZnO nanocoatings in an enclosed glass cabinet and the differences in temperature with respect to exposure to sunlight are highlighted. Finally, a prototype coated with ZnO NPs maintains lower indoor temperature than the commercially available white paint coated model in the order of 2.7 ºC.

Synthesis of transparent thermal insulation coating for efficient solar cells

“…The nano-ZnO coating system, namely, Z1B1 and Z1B2 showed further decrement in temperature at 44.27°C and 44.23°C, respectively. The temperature of solar cell is reduced by 11.48°C which is comparable with recent thermal-insulation coating study (Benitha et al , 2022; Hamid et al , 2022). The nano-ZnO is commonly used as thermal-insulation coating for energy-saving windows where it can reduce the interior temperature as high as 34.90°C (Termkleebbuppa et al , 2020).…”

A Comparative Analysis of Standard and Nano-Structured Glass for Enhancing Heat Transfer and Reducing Energy Consumption Using Metal and Oxide Nanoparticles: A Review

“…The glazing materials consist of four periodic pairs of SiO 2 with variant thicknesses fabricated on a glass sheet showing that the filter transmits 70-80% of the visible light and reflects almost all the infrared radiation [126,127]. The glass treated at the nanoscale sizes coated with the TiO 2 , NPs have risen up the thermal performance rate by maintaining the lower indoor temperature compared to the standard and commercial glasses in the order of 2.7 °C [128]. The recent literature studies have shed light on the utilization of selective and efficient NPs such as TiO 2 and Al 2 O 3 functionalized as anti-absorbent tools connecting with the glass materials to reduce the pavement temperature during the daytime and also increase the human thermal comfort [128][129][130][131][132].…”

Fabrication of nano calcium fluoride impregnated organic polyester alkyd coating for anticorrosive and antibacterial applications

“…CaF 2 dispersed alkyd coating is prepared by mixing the alkyd resin with other non‐toxic additives by ball milling technique. The detailed preparation technique is discussed in our earlier literature 19 . Briefly, 20 wt% (pigment), 60 wt% (binder), 0.6 wt% (outer coat drier), 0.6 wt% (inner coat drier), 0.2 wt% (stabilizer), 0.8 wt% (antisettling agent), Thickener A 0.2 wt%, and 0.6 wt% (wetting agent) are mixed in and milled for a period of 6 h at a speed of 400 rpm.…”

“…The detailed preparation technique is discussed in our earlier literature. 19 Briefly, 20 wt% (pigment), 60 wt% (binder), 0.6 wt% (outer coat drier), 0.6 wt % (inner coat drier), 0.2 wt% (stabilizer), 0.8 wt% (antisettling agent), Thickener A 0.2 wt%, and 0.6 wt% (wetting agent) are mixed in and milled for a period of 6 h at a speed of 400 rpm. Subsequently, 17% (wt%) thinner is added to maintain the homogeny of the paint.…”