Abstract
The frequent occurrence of building fires has triggered a compelling need for flame-retardant coatings. However, the existing flame-retardant coating technologies are high-cost, inefficient, and environmentally unfriendly. In this work, a silica-alumina sol has been developed as the substrate of the flame-retardant coatings. Boron nitride (h-BN) and glass powders with low melting temperature are employed as fillers to improve the flame retardancy. This kind of hybrid coatings can form a high-viscosity liquid-solid phase and be re-paired in high-temperature environments. The experimental results indicate that the as-prepared hybrid coating can act as an oxygen barrier to protect the substrates against fire. Besides, a carbonous layer has been formed on the coating surfaces when exposed to flames, which can stem the spread of the flame spread. Due to the low cost, high stability, self-repairing and easy preparation, the self-repairing hybrid coatings show great potential for application in the fields of fire-proof and flame retarding.
Graphical Abstract
Highlights
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A silica-alumina sol is developed as the substrate of the flame-retardant coatings.
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Glass powders with low melting temperature are employed as fillers.
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The coating can form a high-viscosity liquid-solid phase at high temperatures.
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The coating can act as an oxygen barrier to protect the substrates against fire.
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The data that support the findings of this research are available from the corresponding author upon reasonable request.
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This work was financially supported by Scientific Research Foundation of Hunan Provincial Education Department (22A0113).
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ZC and PY: methodology, investigation, writing—original draft; YD: writing—review and editing, project administration.
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Ding, Y., Chen, Z. & Yin, P. Self-repairing non-expanded flame-retardant coatings prepared by sol-gel method. J Sol-Gel Sci Technol 106, 545–552 (2023). https://doi.org/10.1007/s10971-023-06077-y
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DOI: https://doi.org/10.1007/s10971-023-06077-y