Journal of Coatings Technology and Research最新文献

Developing durable fire-retardant coatings is crucial for enhancing the safety and longevity of structural materials. This research investigates how trusted fire-retardant agents, aluminum hydroxide (ATH) and ammonium polyphosphate (APP), perform in the context of a new self-stratifying fire-retardant epoxy-acrylic coating. The coating system comprises a DGEBA-based epoxy resin and an isobutyl methacrylate homopolymer as the binder. SEM-EDX, ATR-FTIR, and contact angle were employed to investigate self-stratification, microstructure, and fire-retardant distribution. The fire retardancy of the coatings was evaluated before and after aging using furnace tests to assess their durability. Our results demonstrated that incorporating ATH and APP did not disrupt the stratification process in the epoxy-acrylic coating, successfully obtaining a type-I stratified structure. It was also found that the fire retardants predominantly localized in the epoxy-rich layer adjacent to the substrate. Notably, the fire resistance of the self-stratified coatings was similar to that of conventional double-layer coatings, with APP-containing coatings exhibiting superior fire performance compared to those containing ATH. Furthermore, the self-stratified coatings maintained comparable durability and resistance to aging as conventional double-layer coatings. This study underscores the technical feasibility of developing self-stratified fire-retardant epoxy-acrylic coatings with comparable fire performance and durability to traditional double-layer systems. The findings contribute valuable insights into designing eco-friendly and effective fire-retardant coatings, highlighting the potential for optimizing material performance through this innovative technique.

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The potential of the binary solution of 1-ethyl-3-methylimidazolium acetate ([EMIm] Ac) ionic liquid and water to serve as an anti-icing fluid has been investigated. In contrast to pure droplets, the internal morphology of the binary solution droplets is characterized by greater opacity during both the spreading and icing phases. The addition of the ionic liquid to water can reduce the freezing temperature and icing rate, especially for the 20 wt% aqueous solution. A thinner ice layer with the 20 wt% aqueous solution was observed and the average ice thickness was found to be approximately 63.8% of that of the water with surface temperature of 263.15 K. The 10 wt% aqueous solution almost has the same icing rate as water. An aqueous solution with a mass fraction greater than 10 wt% is required when the temperature is − 10°C. The research revealed the relationship between ice thickness and contact time, shedding light on the anti-icing properties of the binary ionic liquid solution.

At present, superhydrophobic coatings have a wide range of applications in self-cleaning, drag reduction, and corrosion protection. However, their poor mechanical stability has a significant impact on the service life and effectiveness of the coatings. In addressing this challenge, this study introduced epoxy resin (EP) with high strength and strong adhesion as the resin matrix. The composite coating, synthesized through a straightforward spraying technique, incorporates modified carbon nanotubes (F-CNTs) and hydrophobic fumed nanosilica (SiO₂) as fillers. The robust EP/F-CNTs/SiO₂ superhydrophobic coating exhibited excellent anti-rubbing ability and superadhesion strength, which was attributed to the EP intermediate layer significantly enhancing the adhesion strength between the coating and the stainless steel substrate with a remarkable adhesion grade of one. Tafel and EIS test results revealed a corrosion inhibition efficiency of up to 99.75% for the coating. The exceptional corrosion resistance of the coating is attributed to the outstanding electron transfer capability of F-CNTs. In addition, the coating could resist corrosion from strong acids and bases. It is believed that the facile and low-cost method offers an effective strategy and promising industrial applications for fabricating robust and super anti-corrosion superhydrophobic surfaces on various metallic materials.

Conductive textiles are becoming increasingly popular due to the growing demand for wearable electronics and the concept of a connected world, the Internet of Things (IoT). With advancements in technology, the robustness and performance requirements of conductive textiles are setting new points to cope with these demands. The wash fastness properties of coated conductive textiles have been a prime concern in the last decade. Particularly in the case of energy storage devices such as supercapacitors and batteries, conductive polymer-coated textiles are most favorable in terms of integration, performance, and comfort. Wash-durable conducting polymer-coated textile-based supercapacitors are practical in moist and humid environments without compromising the general textile appearance. Polymer-coated textile-based supercapacitors must be durable and conductive for various smart wearable applications. In conjunction with their characteristic electrochemical performance, lightweight, flexibility, conformability, and safe human usage, conducting polymer-coated textile-based supercapacitors may be cut and sewn like normal fabric with washable attributes. Polymer-coated textile-based supercapacitors can be easily washed and dried without significant loss in conductivity under standard water and detergent washing procedures, which is necessary to determine their service life and performance for numerous wearable and skin-attachable applications. In the present work, conducting polymer-coated textile-based supercapacitor coatings are reviewed from the perspective of their wash fastness, and their effect on the electrochemical performance before and after water and detergent washing is also critically reviewed in light of standard washing procedures.

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This paper investigates the condensation and dust removal mechanisms of self-cleaning superhydrophobic and superhydrophilic coatings on photovoltaic modules. Experimental tests were conducted on typical dust types found in northwest China, including sand, laterite and laterite salt, to examine the effects of different dust types on the condensation and dust removal properties of the coatings. The results show that the wettability of the self-cleaning coating plays a key role in the movement of dust and the subsequent recovery of photovoltaic (PV) module output power after condensation and dust removal. On the surface of the superhydrophilic coating, there is no significant shrinkage agglomeration of the dust during condensation, while the dust diffusion during drying further increases the shading area. On the contrary, on the surface of superhydrophobic coating, there is obvious dust shrinkage agglomeration during both condensation and drying, especially the shrinkage of laterite salt is most obvious, and the output power recovery of PV modules can reach 96.59%. With the increase of the degree and range of dust shrinkage, the recovery rate of PV module output power is significantly increased. These research results provide an important scientific basis and practical value for the sustainable development and wide adoption of PV industry.

This article aims to evaluate the effect of edible coatings based on sulfated polysaccharide (SP) from the red algae G. birdiae in extending the shelf life of Pacific shrimp filets. The SP was obtained by hot aqueous extraction of previously dried G. birdiae. Experimental design 3² was carried out to evaluate the wettability of SP coating, using glycerol as plasticizer. By the Zisman method, the shrimp surface has low energy, and the best coating showed a wettability of − 6.6998 ± 1.09 mN/m. Microbial and physicochemical analysis were performed for 180 days on frozen shrimp submitted to SP coating and glaze. SP coating improved chemical and microbial stability of shrimp compared to the glazing method. The weight loss, pH, and lipid oxidation of shrimp coated with SP solution were comparable with those of the glazing method. Therefore, SP from G. birdiae showed high potential as an edible coating for Pacific shrimp filets.

The degradation of wood in outdoor applications, which affects its physical and mechanical properties, is a significant issue in the context of cultural heritage. Traditional oil paints applied to exterior wood surfaces offer certain benefits, including moisture resistance and excellent coverage, though one of the negative effects is surface oxidation. Historically, oil paints have been shown to be durable, lasting 50–100 years if maintained regularly. However, there are no long-term data on the durability of linseed oil-based coatings under natural weathering conditions. To fill this gap in the research literature, our study aimed to compare the performance of these coatings on wooden surfaces and assess their protective properties over time. We tested four paint formulations containing chromium oxide green, linseed oil, and different plant resins for comparison (triterpenoid resins—dammar and copal, diterpenoid resin mastic). We looked at two forms of each paint: semi-transparent and opaque. The prepared specimens were exposed to weather conditions typical of the Central European climate for 6 years. The specimens were then analyzed for chemical, contact angle and color changes. After 6 years, the wood painted with opaque coatings showed the least color change, demonstrating their superior durability. In contrast, semi-transparent paint displayed more significant variations in all measured parameters when compared to opaque paint. Nevertheless, semi-transparent paint still performed adequately after 6 years of exposure to the elements, fulfilling its intended purpose. The need for research arises from the lack of long-term data on the durability of linseed oil-based coatings under natural weathering conditions, and the study aims to compare the performance of these coatings on wooden surfaces and assess their protective properties.

Most industries are facing problems with the corrosion of metals. Anticorrosive coatings can efficiently prevent metal corrosion. In this study, novel nanocomposite coating layers were prepared on low-carbon steel using electrostatic spray. Aluminum-rich epoxy–polyester (ALREPP) was prepared as a sacrificial metal and coated layer and functionalized with graphene oxide (GO/ALREPP) and silicon dioxide–graphene oxide (SiO₂-GO/ALREPP). In a water–alcohol solution, a sol–gel preparation method has been used to produce SiO₂-GO using tetraethoxysilane. Characterization of the prepared nanohybrid composites was conducted using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV–Vis spectroscopy, and field emission scanning electron microscopy (FESEM). Open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS), Tafel polarization, and pull-off adhesion tests were utilized to examine the coated steel substrates’ mechanical properties and corrosion resistance. As demonstrated by the results, the anticorrosion protection effect of SiO₂-GO/ALREPP on the substrate was better than that of pure EPP and GO. The nanofiller’s uniform distribution decreased the corrosive electrolyte penetration into the coating material, exhibiting excellent anticorrosion performance and enhanced corrosion protection efficiency up to 99.9%.

Studies on the effective use of plant-based waste products in the field of industrial production—as in every discipline—have recently been accelerated by rising environmental contamination and issues with synthetic raw materials. Based on this, in this study, we aimed to investigate the potential role that molasses (MLS), a by-product of the sugar industry, can play in the creation of composite materials. In this context, MLS was incorporated into acrylic latexes at various rates via emulsion polymerization in the presence of butyl acrylate (BA), methyl methacrylate (MMA), acrylic acid (AA), and 2,3-epoxypropyl methacrylate (GMA). The structures of the synthesized hybrid latexes were elucidated by FTIR analysis. Particle sizes of hybrid latexes were determined by DLS analysis, and the thermal properties of hybrid latexes were determined by DSC and TGA analysis. Mechanical properties were determined by a tensile test. The results showed that MLS was successfully incorporated into the polymer structure by emulsion polymerization and that MLS imparted thermoplastic properties to acrylic latexes. The synthesized hybrid latexes were evaluated for use in the production of pumice bricks, based on the mechanical properties of the prepared bricks. From the tensile strength results of the prepared briquettes examined at 100, 125, and 150 °C, it was concluded that all emulsions exhibited better strength at 150 °C [15 MPa, 8 MPa, 6 MPa, and 5 MPa for 0 (pristine), 5%, 10%, and 15% molasses incorporated latexes, respectively] and all briquettes were better than commercial pumice briquettes. It was determined that these latexes could be utilized in the construction of building materials.

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