Abstract
Paper is one of the most widely used materials, due to its application in books, packaging, and office supplies. However, conventional paper has many disadvantages, such as low tensile strength, poor resistance to water and oil contamination, lack of antigraffiti capability, and easily deformed by moisture. Therefore, we proposed a double-layer protective coating that consists of a polyurethane (PU) bottom layer, to enhance tensile strength, and a top polydimethylsiloxane (PDMS) composite layer to enable antigraffiti and contamination-resistant capabilities. In the study, a double-layer coating was applied to conventional paper, using a simple two-step spraying method. The results showed that the prepared coating structure exhibited outstanding self-cleaning characteristics with respect to both water and oil contamination and adequately demonstrated antigraffiti capability. Moreover, the coating maintained superhydrophobic and oil-stain resistance after four months of outdoor storage. Finally, the tensile strength of the coated paper was 6.3 times as high as that of the original paper, making this coating structure a promising solution to the problems that limit paper from being more widely utilized in commercial and consumer application.
Highlights
Paper is a widely used material throughout numerous commercial industries and by individual consumers, owing to its versatility, low cost, extensive production, and short processing time
As such, when paper comes in contact with water, the water molecules are absorbed along the gaps, making it vulnerable to moisture and difficult to preserve over long periods of time [1]. (2) Paper is smudged by oily materials because of its poor antigraffiti performance
Researchers have attempted to design a superhydrophobic coating that is self-cleaning, dust-proof, moisture-proof, and anticorrosion [2,3,4,5]. Examples of such studies include Ogihara et al [6], who reported that superhydrophobic coatings can be deposited on paper by spraying alcohol suspensions of SiO2 nanoparticles; Baidya et al [7] described a simplistic methodology to develop a superhydrophobic paper via manufacture of fluoroalkyl functionalized cellulose nanofibers (CNFs); Shi et al [8] prepared a superhydrophobic nanocomposite coating using hydrophobic silica nanoparticles as a filter and polyvinylidene fluoride (PVDF) as a film-forming material, which was applied to the paper’s surface through a simple, one-step spray dispersion method; Wang et al [9] manufactured a superhydrophobic paper by coating it with silica sol using tetraethylorthosilicate (TEOS) and trimethylethoxysilane (TMES) as a precursor and coprecursor, respectively
Summary
Paper is a widely used material throughout numerous commercial industries and by individual consumers, owing to its versatility, low cost, extensive production, and short processing time. (3) Paper has a low tensile strength and is susceptible to tearing For these reasons, researchers have attempted to design a superhydrophobic coating that is self-cleaning, dust-proof, moisture-proof, and anticorrosion [2,3,4,5]. Researchers have attempted to design a superhydrophobic coating that is self-cleaning, dust-proof, moisture-proof, and anticorrosion [2,3,4,5] Examples of such studies include Ogihara et al [6], who reported that superhydrophobic coatings can be deposited on paper by spraying alcohol suspensions of SiO2 nanoparticles; Baidya et al [7] described a simplistic methodology to develop a superhydrophobic paper via manufacture of fluoroalkyl functionalized cellulose nanofibers (CNFs); Shi et al [8] prepared a superhydrophobic nanocomposite coating using hydrophobic silica nanoparticles as a filter and polyvinylidene fluoride (PVDF) as a film-forming material, which was applied to the paper’s surface through a simple, one-step spray dispersion method; Wang et al [9] manufactured a superhydrophobic paper by coating it with silica sol using tetraethylorthosilicate (TEOS) and trimethylethoxysilane (TMES) as a precursor and coprecursor, respectively. When the coating was applied to the paper with a simple two-step spraying process, it was shown to be selfcleaning and transparent and has high antigraffiti performance and enhanced strength
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