可发性聚苯乙烯(EPS)是一种常用的建筑外墙保温材料,具有容重小、机械强度高、抗腐蚀和易成型切割等优点。为了进一步提高EPS板保温性和阻燃性,采用悬浮聚合工艺制备以SiO₂气凝胶为“核”,聚苯乙烯为“壳”的有机-无机复合颗粒,应用高压浸渍在复合颗粒中加入发泡剂,通过蒸汽发泡制备有机-无机复合保温板。结果表明:在聚苯乙烯中加入SiO₂气凝胶,可以有效地降低聚苯乙烯/SiO₂气凝胶核壳复合颗粒的玻璃化温度;随着SiO₂气凝胶掺杂量的增加,复合颗粒的发泡倍率逐渐降低;SiO₂气凝胶质量含量为1.6%,复合保温板的导热系数为0.0281W/(m·K),抗压强度为0.21MPa。

Expandable polystyrene(EPS) boards are commonly used for thermal insulation materials in exterior wall of buildings,which had excellent mechanical strength,corrosion resistance and easy forming-cutting.For further enhancing the insulation and flame-retardant performance of EPS boards,suspension polymerization process was used to prepare organic-inorganic composite particles with SiO₂ aerogel as the “core” and polystyrene(PS) as the “shell”.High pressure impregnation process was used to add foaming agent into the particles to prepare organic-inorganic composite insulation boards by steam foaming.The experimental results showed that,adding SiO₂ aerogel to PS effectively reduced the glass transition temperature of PS/SiO₂ particles.The foaming ratio of particles decreased gradually by the increasing of SiO₂ content.The board with 1.6wt% of SiO₂ aerogel demonstrated a thermal conductivity of 0.0281W/(m·K) and a compressive strength of 0.21MPa.