发泡剂含量和发泡温度对无碱玻璃纤维废丝制备泡沫玻璃的性能影响

Effect of Foaming Agent Content and Foaming Temperature on Performance for Preparing Foam Glass using Non-alkali Fiberglass Waste

以无碱玻璃纤维废丝为主要原料,SiC为发泡剂,用烧结发泡法制备了高强度低密度保温泡沫玻璃。研究了发泡剂含量及发泡温度对泡沫玻璃气孔率、孔结构、表观密度、抗压强度和导热率的影响。研究结果表明,随着发泡剂含量的增加,孔径逐渐增大,表观密度和抗压强度降低,过多的发泡剂会导致大气孔的出现;随着发泡温度的提高,泡沫玻璃的气孔逐渐增大,表观密度呈现下降趋势,当发泡温度过高会导致大孔和连通孔的出现;当发泡剂含量为3wt%,发泡温度为950℃,保温时间为30min时制得的泡沫玻璃综合性能最佳,表观密度为0.216g/cm^3,抗压强度为8MPa,抗折强度为4MPa,吸水率为0.28%,导热系数为0.061W/(m·k)。

Foam glass as thermal insulation material with high strength and low density was prepared from alkali-free glass fiber waste as raw material and SiC as foaming agent by sintering-foaming method. The influences of foaming agent content and foaming temperature on porosity, pore structure, apparent density, compressive strength and thermal conductivity were studied. The experimental results showed that, with increasing the content of foaming agent, pore diameter gradually increasing,apparent density and compressive strength is declined, excess of foaming agent can lead to the appearance of large pores~ With upgrading the foaming temperature, average pore size gradually increasing, apparent density and compressive strength deduce, when the foaming temperature too high can lead to the emergence of the big hole and connecting hole. The foaming glass with the best quality was obtained when the product is with apparent density 0.216 g/cm3, compressive strength 8 MPa, bending strength 4 MPa, water absorption 0.28% and coefficient of thermal conductivity 0.061 W/（m k）.