Conventional Paint Research Articles

Turning Discarded Oyster Shells into Sustainable Passive Radiative Cooling Films

Inorganic materials used in passive radiative cooling have achieved a commendable level of performance through synthesis, yet they lack sustainability and environmental friendliness as they do not incorporate recycling. This study developed a novel passive radiative cooling (PRC) film utilizing calcium carbonate extracted from discarded oyster shells (D-CaCO3) and polyurethane (PU) as the matrix. This sustainable approach leverages the unique properties of CaCO3, such as high solar reflectance and strong infrared emissivity, to achieve significant cooling effects. The PU/D-CaCO3 film absorbs only 22% of total solar light and exhibits a high emissivity of 95% in the atmospheric window, achieving temperatures up to 7 °C lower than the surrounding environment under 650 W/m2 solar irradiance. Furthermore, field tests were conducted to verify the implementation of our optical strategy by analyzing the optical properties and FDTD simulations. Consequently, the PU/D-CaCO3 film outperformed conventional white paint and pure PU, demonstrating a maximum temperature difference of 7 °C. Additionally, the passive radiative cooling efficiency of the film was verified through theoretical calculations. The oyster-shell-derived CaCO3 utilizes waste and contributes to carbon sequestration, aligning with sustainable and eco-friendly goals. This research demonstrates the potential of using marine-derived materials in passive cooling technologies, offering a path to reduce energy consumption and greenhouse gas emissions in cooling applications. The findings highlight the commercial viability and environmental benefits of PU/D-CaCO3 films, marking significant progress in passive radiative cooling.

NIR-Reflective Black Photonic Films Designed for Effective LiDAR Recognition.

Conventional dark-tone paints absorb both visible light and near-infrared (NIR) wavelengths, posing a challenge for light detection and ranging (LiDAR) recognition in autonomous driving. To overcome this issue, various chemical and structural coating materials have been explored to selectively reflect NIR. In this study, we newly propose colloidal photonic crystals with a stopband in the NIR range, fabricated through the spontaneous formation of crystalline arrays of silica particles dispersed in a photocurable resin, as a potential solution. The stopband position is finely adjusted by controlling the volume fraction of particles, and the translucent films are rendered black by incorporating carbon black nanoparticles into the interstitial regions. By optimizing the concentration of carbon black, we achieve a balance of low visible light and high LiDAR intensity. These black photonic films demonstrate superior LiDAR intensity compared to commercial dark-tone paints and perform on par with the perylene black-deposited white coating, one of the most promising LiDAR-assistive materials currently available, under normal reflection conditions. Additionally, the photonic films are highly durable, thermally stable, nontoxic, and environmentally friendly, making them promising candidates for LiDAR-assistive coatings.

Experimental analysis of solar desalination system performance with graphene and graphitic carbon nanopaint-coated solar absorbers

Improving the efficiency of basin-type solar stills is crucial for ensuring reliable access to clean water in areas facing water scarcity. One effective way to increase water yield production is by applying various coatings to the solar still's absorber plate. Using nanocoatings on solar absorber plates increases solar radiation absorptivity and minimizes reflectivity, which helps improve water production. In this proposed work, Graphene nanoplatelets (GNPs)-based nano paint, graphitic carbon nanoparticles (GCNPs)-dispersed black paint, and conventional black paint were applied to the solar still's absorber plate. According to the study, the GNPs' nano paint resulted in a cumulative solar still productivity that was 48.23 % higher than the GCNPs-dispersed black paint and 10.28 % higher than the conventional black paint. It also revealed that the energy efficiency of solar stills with GCNPs and GNPs nano paint-coated absorbers was 56.96 % and 69.77 %, respectively, while the traditional black paint-coated absorber managed only 39.42 %. The calculated exergy efficiency of these three solar stills was 8.55 % for the conventional black paint, 13.93 % for the GCNPs, and 22.93 % for the GNPs nano paint-coated absorber. This proposed system also has an energy payback period of 1.79 years and contributes to achieving a carbon credit of $994.90 through the market. The cost of distilled water in this system is also 0.016$/L.

Design and Fabrication of Motorized Paint Spatula Scraper

In light of the increasing demand for construction globally, this study emphasizes the importance of painters' well-being in achieving structural aesthetics. The goal of the study is to enhance the ergonomic design of the widely used Paint Spatula Scraper, promoting comfort and productivity for painters. Currently, painters still rely on manually operated tools, which can cause strain on their hands and neck from constant use. Recognizing this challenge, we aim to improve the painter's experience by replacing the conventional paint spatula scraper with a state-of-the-art Slider Crank Mechanism integrated into a DC motor. The basic idea of this innovative design is to use a DC motor, which guarantees longevity, low maintenance, and efficiency. The paint spatula scraper's functionality is improved by the sophisticated mechanism known as the Slider Crank Mechanism, which is integrated with this motor and scraper is made of premium stainless steel, its durability and corrosion resistance are guaranteed. The blade, with dimensions of 200 mm in width and 0.5mm in thickness, guarantees excellent performance while maintaining a lightweight profile for ease of use. This cutting-edge instrument promises painters a future where their work becomes more enjoyable, sustainable.

Exploring of Bacterial Pigments from Thamirabarani River Alluvial Soil: Harnessing their Versatility in Dye and Paint Manufacturing

Color is a fundamental aspect of human life, playing a vital role in culture and industry. The paints and coatings industry, a significant sector within global manufacturing, has seen increased scrutiny due to its environmental and health impacts. Conventional paints contain harmful chemicals like volatile organic compounds (VOCs) and solvents, which pose risks to both workers and the environment. Recent shifts towards natural and bio-based pigments, particularly those derived from microorganisms, offer a promising alternative. Microbial pigments, such as those produced by chromogenic bacteria, provide eco-friendly, non-toxic colorants with additional benefits like antioxidant and antimicrobial properties. This review highlights the potential of bacterial pigments in various applications, particularly in the textile industry as natural dyes, and discusses their role in reducing the environmental footprint of synthetic pigments. The study also emphasizes the importance of further research into improving the production and stability of these bio- pigments for broader commercial use in industries such as food, cosmetics, and pharmaceuticals.

High performance coating formulation using multifunctional monomers and reinforcing functional fillers for protecting metal substrate

Purpose Effects of corrosion are very dire and mitigation of corrosion holds prime importance. Protective coatings play major role in preventing corrosion of metals and coating application is the most convenient, economical and quick solution. The purpose of the study is development of protective coatings to effectively mitigate corrosion of metal components. Design/methodology/approach A high-performance anticorrosion coating was prepared using multiple monomers and paste of functional and reinforcing fillers with extenders to protect metal components from corrosion in aggressive environmental conditions. The structures of copolymers synthesized with multiple monomers were studied by the NMR and FT-IR spectroscopic techniques. The percentage conversion of different proportions of various monomers was estimated using gas chromatography technique. The functional paste to impart superior anticorrosion properties was prepared using various functional and reinforcing fillers. The final coatings were prepared by mixing these resins with functional paste in various proportions. Findings The prepared anticorrosion coating was tested for high-performance mechanical and chemical properties and it was witnessed that the said coating offered desired performance properties needed for protecting metal components from corrosion. Research limitations/implications As such it is overcoming drawbacks of two pack systems and thus has almost no limitations or implications for application on metal substrate. Practical implications Being formulated as a single pack, it is free from drawbacks otherwise involved in two pack system of conventional paints. The coating system developed is very easy to apply using conventional tools, namely, brush, spray and roller techniques. The formulation is made in such a way that it has fast-drying properties. Makes painting or coating operations cost effective and confirm the performance. Social implications The findings of the research have anticorrosion nature that can enhance the life span of the substrates. It is specially designed for metal substrate and can protect metal substrate from corrosion in most aggressive conditions. Thus, it helps to reduce losses due corrosion and increase safety of metal structures and human being as well. As it is based on conventional material but with new formulation and technology, it has commercial possibilities to explore. Originality/value Unlike conventional protective coating systems, the said coating offered disruptive features like single pack systems and fast drying at ambient temperature along with high-performance properties. The coating formulation was observed to have a great importance in industry for effective corrosion mitigation and to reduce losses due to corrosion.

Memorialising Keats: Severn, Headstones and Hyperion

For obvious reasons, Keats's biographers have focused primarily on the last five months of the poet’s life and on the making of his reputation in the later nineteenth century. They have spent very little time, however, on the two uncertain years that followed the poet’s death when his legacy, largely in the hands of Brown, Taylor and Severn, hung in the balance. As Severn was recovering from Keats's death, he fought to establish his own livelihood as a painter and find an adequate means of memorialising his friend. He was preoccupied with two works of art, The Death of Alcibiades and the headstone for Keats's grave. I argue that these artworks represent complex expressions of Severn's grief and in this sense are both memorials, though Alcibiades disguises its aims in a conventional historical painting. In the strong reading of Hyperion embedded in the picture, Severn finds a way of coming to terms with the traumatic aftermath of Keats's death as well as the critical attacks on his poetry. My recent rediscovery of two key manuscript letters of this time by members of the Keats Circle lends support to the argument.

Analysis of Blackening Reaction of Zn–Mg–Al Alloy Coated Steel Prepared by Anodizing Process

The rising demand for black-treated steel faces challenges with conventional black painting due to issues like scratching and peeling, impacting corrosion resistance and aesthetics. This study explores an alternative method, anodic oxidation, to blacken the surfaces of galvanized or coated steel plates. Parameters like temperature, duration, current density, and gas type were varied during the blackening process. The investigation aimed to identify key factors influencing the blackening. Scanning electron microscopy observed the morphology, while energy-dispersive X-ray spectroscopy and glow discharge mass spectrometry analyzed the chemical composition distribution. X-ray diffraction and X-ray photoelectron spectroscopy conducted compound crystal structure analysis. Results indicate higher temperatures, longer durations, and higher current densities improve blackening through anodic oxidation. Increased magnesium proportion on the surface leads to roughness and porous magnesium oxide formation, enhancing light absorption and explaining the observed blackening effect.

Exploring Sustainable Coating Solutions for Applications in Highly Corrosive Environments

To protect carbon steel from degradation via corrosion, it is usually coated using a multilayer system of paints composed of petroleum-based polymers. The chemical industry is currently moving towards more sustainable chemistry, in which one of the main objectives is to reduce fossil fuel use and the derived raw materials. However, the replacement of petroleum-based raw materials with those that are bio-based is not straightforward since the properties of these new materials are often inferior to the traditional ones. One of the most used resins in primer paints is Diglycidyl ether bisphenol A (DGEBA). This is an epoxy resin synthesized from bisphenol A (BPA), a toxic and carcinogenic petroleum-based compound. This study investigates the substitution of the primer coating in a three-layer coating system with two different types of primer coating formulations, one which is partially bio-based and another that is BPA-free. The corrosion protection effectiveness of these sustainable coatings is assessed not only at the laboratory scale but also in real offshore conditions. Moreover, the adhesion of the different coating systems is evaluated before and after each ageing test. The results reveal that these novel coatings exhibit comparable performance to conventional paints while providing a more sustainable corrosion protection alternative.

Numerical Simulation of Flow Characteristics for Supercritical CO2-Sprayed Polyurethane Resin.

Conventional paint spraying processes often use small molecule organic solvents and emit a large amount of volatile organic compounds (VOCs) that are highly toxic, flammable, and explosive. Alternatively, the spraying technology using supercritical CO2 (scCO2) as a solvent has attracted attention because of its ability to reduce VOC emissions, but the flow characteristics of coatings have not been thoroughly studied. Therefore, we numerically simulate the spraying process based on the actual process of scCO2 spraying polyurethane coatings by computational fluid dynamics (CFD). The effects of inlet pressure and volume fraction of scCO2 on the fluid motion parameters inside the nozzle as well as the atomization effect of droplets outside the nozzle are investigated. The simulated results show that a fluid with a large volume fraction of scCO2 will obtain a smaller density, resulting in a larger velocity and a larger distance for the spray to effectively spray. Higher coating content and bigger inlet pressures will result in higher discrete phase model (DPM) concentrations, and thus a bigger inlet pressure should be used to make the droplets more uniform across the 30° spray range. This study can provide theoretical guidance for the process of scCO2-sprayed polyurethane resin.

Virtual Painting through Hand Gestures: A Machine Learning Approach

The hand gesture paint application represents an innovative venture in the realm of computer vision, harnessing the capabilities of the MediaPipe library and OpenCV to develop a sophisticated painting tool driven by hand gestures. By leveraging these powerful frameworks, the application enables users to express their creativity through intuitive gestures captured by a webcam. At its core, the work seeks to redefine the conventional painting experience by providing users with a seamless interface controlled entirely by hand movements. Through the integration of the MediaPipe library and OpenCV, users can effortlessly draw, erase, and switch between various drawing tools, all with the fluidity of natural hand gestures. By eliminating the need for traditional input devices, the hand gesture paint application offers a novel approach to digital art creation, empowering users to engage directly with their canvas in a more intuitive and immersive manner. Through this innovative blend of technology and creativity, the application opens up new avenues for artistic expression, inviting users to explore the boundless possibilities of digital painting through the simple movement of their hands.

Application of Innovative Electromagnetic Screens for Reconstruction and Restoration of Buildings

Protective properties of composite electromagnetic screens on the base of conventional commercial paints were studied. The shielding fillers included metal-containing products from industrial wastewater treatment. Such compositions with a thickness of 100 to 150μm, were found to allow reaching high-frequency electromagnetic radiation shielding coefficients up to 3.0-3.5. Reflection coefficients of electromagnetic waves reach up to 0.3, which meets contemporary technical requirements.

Formulation of Emulsion Paint Derived from Waste Expanded Polystyrene as a Binder

Emulsion paint, also known as water-based paint, is a type of paint that consists of small water droplets suspended in a binder. The binder, typically made of acrylic or vinyl acetate polymers, acts as a film-forming agent that holds the pigments and other additives together. Emulsion paint was formulated from waste expanded polystyrene as a binder. The formulated emulsion paint which underwent a three-staged process had a pH of 7.82, density of 1.31 g/cm3, the drying time was 15-20 and 85-90 minutes for the set to touch and set to hard drying times respectively, viscosity of 10.4 Cp. The formulated paint exhibited good adhesion, tackiness, opacity, flexibility and stability properties. The paint also possessed good resistance to blistering; which indicates that it has good external exposure resistance and thus; can perform well when exposed to environmental conditions such as rain and sun. Effects of concentration on viscosity, density, melting point, refractive index, moisture uptake, turbidity, elongation at break and water solubility were studied for the polystyrene binder to ascertain for its suitability. Fourier transform infrared spectrophotometer was employed to characterized the binder. This investigation revealed favourable properties of a conventional emulsion paint inherent in the formulated polystyrene binder derived emulsion paint such as, drying time, moisture uptake, water solubility.

Analyzing the effect of flooring material type on the performance of an active greenhouse dryer

In this work, the impact of flooring (bottom) material selection on the performance of an active greenhouse dryer (AGD) has been empirically surveyed. In this regard, four AGD configurations with different flooring materials including soil, gravel, sheet metal with conventional black paint and sheet metal with iron (Fe) nano-enhanced black paint have been designed, manufactured, and experimented at same fixed air flow rate. According to experimentally obtained findings, utilizing nano-enhanced black-painted sheet metal in the AGD instead of soil has a potential to almost double the average air temperature difference. Also, using sheet metal with nano-enhanced black paint reduced the drying periods as 41.17 %, 33.33 % and 20 %, respectively in comparison to the configurations that used soil, gravel and sheet metal with conventional matt black paint as bottom material. Average exergetic efficiencies for the tested configurations were obtained between the range of 3.22–11.14 %. Also, using sheet metal with Fe nano-enhanced absorber coating as a bottom material in the system reduced the carbon footprint as 32.66 % (from 1.50 to 1.01 kgCO2eq) in comparison to the system with soil bottom.

NIR reflective Paints as an Alternative for Sustainable Façade Renovation

Several studies of infrared reflective materials used on opaque envelopes have shown that their application can reduce the surface temperature and the cooling energy needs of buildings and help mitigate the urban heat island effect. Some of these studies were carried out by incorporating near-infrared (NIR) reflective materials on new buildings or as part of new construction systems, considering that one of the simpler and most used façade renovation methods is repainting. In a repainting process, the reflectance could change since the reflectance depends on the interaction between the reflective layer and the substrate. A study was carried out on the reflectance of paints with NIR reflective properties applied on the finishing coat of external thermal insulation composite systems (ETICS), simulating a façade renovation. A black NIR reflective paint was applied in one layer over the existing finishing coat of two ETICS samples: one with a grey mortar colour and another with a conventional black colour. A second configuration was considered by adding an intermediate layer of regularisation with white colour. Traditional black colour and the mortars were applied on a transparent acrylic base as a reference. The samples were assessed with a modular spectrophotometer to assess the total and NIR reflectance and the colour coordinates on the CIELab space. The results showed that the reflectance and colour of the new layer are independent of the colour or type of the first layer in the case of conventional paint. Conversely, the substrate affects the NIR paint performance, where a lighter substrate can help improve the reflectance but can also lead to a more significant colour change. Likewise, the results of the paint over a new white layer resulted in a lower reflectance compared to the reflectance of a single paint layer.

A Self-Healing Thermoset Epoxy Modulated by Dynamic Boronic Ester for Powder Coating.

Thermoset powder coatings exhibit distinctive characteristics such as remarkable hardness and exceptional resistance to corrosion. In contrast to conventional paints, powder coatings are environmentally friendly due to the absence of volatile organic compounds (VOCs). However, their irreversible cross-linking structures limit their chain segment mobility, preventing polymers from autonomously repairing cracks. Dynamic cross-linking networks have garnered attention for their remarkable self-healing capabilities, facilitated by rapid internal bond exchange. Herein, we introduce an innovative method for synthesizing thermoset epoxy containing boronic ester moieties which could prolong the life of the powder coating. The epoxy resin system relies on the incorporation of two curing agents: one featuring small-molecule diamines with boronic bonds and the other a modified polyurethane prepolymer. A state of equilibrium in mechanical properties was achieved via precise manipulation of the proportions of these agents, with the epoxy composite exhibiting a fracture stress of 67.95 MPa while maintaining a stable glass transition temperature (Tg) of 51.39 °C. This imparts remarkable self-healing ability to the coating surface, capable of returning to its original state even after undergoing 1000 cycles of rubbing (using 1200-grit abrasive paper). Furthermore, the introduction of carbon nanotube nanoparticles enabled non-contact sequential self-healing. Subsequently, we introduce this method into powder coatings of different materials. Therefore, this work provides a strategy to develop functional interior decoration and ensure its potential for broad-ranging applications, such as aerospace, transportation, and other fields.

Colorful low-emissivity paints for space heating and cooling energy savings

Space heating and cooling consume ~13% of global energy every year. The development of advanced materials that promote energy savings in heating and cooling is gaining increasing attention. To thermally isolate the space of concern and minimize the heat exchange with the outside environment has been recognized as one effective solution. To this end, here, we develop a universal category of colorful low-emissivity paints to form bilayer coatings consisting of an infrared (IR)-reflective bottom layer and an IR-transparent top layer in colors. The colorful visual appearance ensures the aesthetical effect comparable to conventional paints. High mid-infrared reflectance (up to ~80%) is achieved, which is more than 10 times as conventional paints in the same colors, efficiently reducing both heat gain and loss from/to the outside environment. The high near-IR reflectance also benefits reducing solar heat gain in hot days. The advantageous features of these paints strike a balance between energy savings and penalties for heating and cooling throughout the year, providing a comprehensive year-round energy-saving solution adaptable to a wide variety of climatic zones. Taking a typical midrise apartment building as an example, the application of our colorful low-emissivity paints can realize positive heating, ventilation, and air conditioning energy saving, up to 27.24 MJ/m2/y (corresponding to the 7.4% saving ratio). Moreover, the versatility of the paint, along with its applicability to diverse surfaces of various shapes and materials, makes the paints extensively useful in a range of scenarios, including building envelopes, transportation, and storage.

Performance testing of nanocomposite based coatings with high dust pickup resistance and solar reflective index for energy efficiency in built environment

Cool paints/coatings are passive solutions which enable reduction in energy loads and impart substantially in buildings owing to their reflective properties. The most common metric to assess their performance is the Solar Reflective Index (SRI). Higher SRI values for paints enable the reflectance of solar radiation and further aid in reducing the cooling load in buildings. This study presents the development and testing of a novel nanocomposite-based coating, NanoDPR, designed to offer high dust pickup resistance and solar reflective index for energy efficiency in the built environment. The research addresses the challenges of dust accumulation affecting the long-term performance of such cool coatings in arid climatic conditions of the UAE. The study includes experimental investigation, conducted over 1000 days, demonstrated that the NanoDPR coating exhibits superior resistance to dust pickup and a lower reduction in SRI values compared to a reference coating. The work further extends to modelling on a residential townhouse for energy savings evaluation. The results revealed a 5% reduction in energy consumption annually and an avoidance of 2.75 kg of CO2/m2 of exterior painted area with the NanoDPR coating in comparison with conventional reflective paints. Results show that the development and adoption of such coatings can significantly impact energy consumption and carbon emissions, ultimately promoting a more sustainable future.

An Overview of the Current State and the Advantages of using acrylic resins as anticorrosive coatings

Corrosion protection coating is one of the most common ways of protecting structures against all kinds of negative external influences. Various types of anti-corrosion coatings can be used to successfully extend the service life of products. However, conventional paints are not water-resistant coatings, and small cracks always appear over time due to temperature fluctuations. Compared to other types of coatings, acrylic coatings are less expensive and just as durable. Acrylic resins have high anti-corrosion properties as well as water resistance, impact resistance, good adhesion to the substrate and overall durability. This powerful combination of cost and performance makes acrylic coatings such a popular and sensible solution for protecting structures against corrosion. The main purpose of this review is to describe the different types of acrylic resins and compare their properties, synthesis and drawbacks. It is expected that this work will be the cornerstone for the future development of acrylic resins.

탄생석을 활용한 플라워 헤어장신구 디자인 제작 연구

This study attempted to develop hair accessories based on the meaning of birth stone. For this, they were designed with birth stone, considering the fact that people want to have their own uniqueness. Specifically, hair accessories which can be kept for a long time were created after making flowers with hair. For birth stone representing each season (spring, summer, fall, winter), amethyst (February), diamond (April), pearl (June), peridot (August), opal (October) and turquoise (December) were chosen. Then, hair accessories were modeled after making flowers. The goals of this study are to meet people’s desire to stay unusual with birth stone and make valuable accessories with such birth stone by recycling hair. With an understanding of the meaning of birth stone, proper images were designed. Then, after creating a frame for modeling with silver yarn, birth stone was glued. The flowers made with hair were twisted with silver yearn and attached. The above results confirm that even though it is special to make such accessories manually, there might be many difficulties for mass production. It is anticipated that in order for birth stone and hair to be used as hair art in daily life, picture frames, accessories, daily necessities and up-cycle items would be commercialized. In addition, this study proposes designs in diverse, sensory colors for aesthetic art pictures created with hair, not just conventional paintings painted by painters.