高固含量聚硅酸钾基防火凝胶及其在复合防火玻璃中的应用

通过蒸发浓缩的方法制备了高固含量硅溶胶分散液,采用纳米粒度及Zeta电位分析仪研究了蒸发浓缩前后分散液中无机粒子粒径和Zeta电位的变化.进而,以高固含量硅溶胶分散液为原料,氢氧化钾溶液为固化剂,制备了高固含量聚硅酸钾基防火凝胶和复合防火玻璃,采用小型耐火试验炉、热重分析、扫描电子显微镜、红外光谱等测试手段,研究了复合...

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

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.