Preparation and performance of laminated anti‐fire glass using the K₂O·nSiO₂‐based ultrathin and flexible membrane

Abstract

We present a new method for synthesizing cold‐resistant laminated anti‐fire glass using a K2O·nSiO2‐based ultrathin flexible membrane, which is prepared by vacuum surface treatment method with ball‐milled core–shell SiO2 emulsion (55 wt%). We systemically characterize the mechanical, optical, rheological, cold‐resistant, fire‐resistant, and weather‐resistant performances of this glass. The formation mechanism of K2O·nSiO2‐based ultrathin membrane is studied in detail using multispeckle diffusing–wave spectroscopy and scanning electron microscopy. Then, the tensile strength, plasticity, and rheological behavior of the materials with different moduli are characterized. Combined with thermal gravity analysis, we characterize the compositions of K2O·nSiO2‐based materials with different moduli. For the K2O·nSiO2‐based ultrathin flexible membrane, the appearance of air‐conducting microchannels is designed, resembling the Wu Zhu coin morphology (a square hole circular coin in ancient China) or honeycomb wall morphology. These structures endow the visible region of the anti‐fire glass with a reduced presence of microbubbles. As a type of building safety glass, the spongelike microporous insulation layer can increase the heat‐insulating time in the event of a fire. Furthermore, the weather‐resistant performance of this glass is demonstrated to be more than 3000 h through an ultraviolet test. This work also provides a new routine for synthesizing high‐quality anti‐fire glass with different shapes, including curved surfaces.