原位生成纳米SiO2及其作为填料对聚氨酯硬质泡沫塑料性能的影响

通过选择适当的乳化剂和水解温度以及控制水对于乳化剂的摩尔比,采用油包水微乳液法在聚醚多元醇中原位合成了纳米SiO2,该聚醚多元醇进一步与TDI反应制备出聚氨酯硬质泡沫塑料.TEM显示原位合成的SiO2微粒呈球状且分散,粒径为50～70nm.随着SiO2填加量的增加,该聚氨酯硬质泡沫塑料的吸水率先升后降.因为原位生成纳米SiO2的加入,聚氨酯硬质泡沫塑料的拉伸强度得到显著提高,冲击强度缓慢增大,而压缩强度则先轻微降低,一直到SiO2的含量为0.9wt%时才开始急剧增大.

IN-SITU GENERATED NANO-SIO2 AND EFFECT AS FILLER ON PROPERTIES OF POLYURETHANE RIGID FOAM

Nano-silica was in-situ synthesized using water-in-oil microemulsion method in polyether polyol by means of controlling molar ratio of water to surfactant and selecting moderate hydrolysis temperature, and this polyether polyol was further reacted with TDI to prepare the polyurethane rigid foam. TEM photograph indicated that silica particles were spherical and dispersed. The size distribution was in the range of 50-70nm. Water absorption of polyurethane rigid foams filled with in-situ generated nano-silica increased firstly and then decreased. Tensile strength of the foam were obriously increased, while there was a relatively slow increase in the impact strength and compression strength first decreased slightly and then increased evidently when the filler added up to 0.9 wt% of the concentration.