High-Solid Potassium Polysilicate Based Fire-Resistant Gel and Its Application in Composite Fireproof Glass

Abstract

Abstract: In order to obtain the composite fireproof glass with better fire resistance, the high-solid silica sol dispersion was first prepared by evaporating water process. The particle size of inorganic particles and Zeta potential changes of the dispersion before and after evaporation were studied using nanoparticle size and Zeta potential analyzer. The results show that the evaporation process has almost no effect on the particle size and dispersion stability of the nanoparticles. Then, the high-solid potassium silicate based fire-resistant gel and composite fireproof glass were prepared using the high-solid silica sol dispersion and potassium hydroxide solution as raw material and curing agent, respectively. Small refractory test furnace and thermogravimetric analysis were used to investigate the fire resistance of the composite fireproof glass and the thermal stability of the fire-resistant gel. The results show that the increase of the solid content in dispersion greatly improves the fire resistance of the composite fireproof glass, and also enhances the thermal stability of the fire-resistant gel to a certain extent. Furthermore, the scanning electron microscopy and infrared spectroscopy tests were used to reveal the fire resistant mechanism of the fireproof gel. It shows that the evaporation process of fire-resistant gel acts as an endothermic function and the solid carbon residue produced by the fire-resistant gel at high temperature plays a role in blocking heat.

Key words: composite fireproof glass, silica sol, potassium polysilicate, fire-resistant gel, fire resistance, thermal stability, fire resistant mechanism

CLC Number:

TQ171

SHANG Ke, WANG Junsheng, ZHAO Bi, WU Yingjie, LIN Guide, ZHAO Jing, JIN Xing, LIU Dan. High-Solid Potassium Polysilicate Based Fire-Resistant Gel and Its Application in Composite Fireproof Glass[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1344-1351.

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