Performance of K2O·nSiO2 based laminated anti-fire glass: Influence of nanoporous morphology

Abstract

As a member of building safety glass, the inorganic laminated anti-fire glass had attracted widespread attention for its applications in providing a retardant and heat-insulating layer to protect people, property, and buildings in fire events while minimizing losses. K 2 O·nSiO 2 based laminated anti-fire glass with stalagmite-like nanoporous morphology was prepared by high-low temperature cyclic method using high content and low viscosity SiO 2 core-shell emulsion. The morphological effect on performances was discussed in more detail. The stalagmite-like nanoporous morphology was shown in SEM micrographs. Because free-water was converted into bound-water, the low-temperature capacity of K 2 O·nSiO 2 based anti-fire material was more than -65°C±1°C. The foaming expansion layer had blocked thermal conduction and ensured window integrity under fire. The results showed that stalagmite-like nanoporous morphology had extended heat-insulating time and ultraviolet (UV) resistant capacity was more than 3000 h for outdoor use. This work has provided a new simple method to prepare K 2 O·nSiO 2 based multifunctional anti-fire glass for architectural safety applications. Preparation routines of K 2 O·nSiO 2 with stalagmite-like nanoporous morphology • K 2 O·nSiO 2 based anti-fire material had a stalagmite-like nanoporous morphology. • Stalagmite-like nanoporous morphology was prepared by a high-low temperature cyclic method. • Free-water bonded with hydrophilic groups is converted into bound-water. • K 2 O·nSiO 2 based anti-fire material wasn’t frozen at the -65 ± 1°C. • This novel anti-fire glass has excellent thermal insulation and UV resistance capacity.