纳米二氧化硅增强硬质聚氨酯泡沫塑料的制备

采用功率超声,将纳米二氧化硅颗粒分散到多次甲基多苯基多异氰酸酯体系内,然后与聚醚多元醇聚合制得了纳米二氧化硅增强的硬质聚氨酯泡沫塑料。SEM分析表明,纳米二氧化硅均匀分散在聚氨酯泡沫中。在较低添加量时,纳米二氧化硅使压缩强度和冲击强度有一定提高,但会引起多次甲基多苯基多异氰酸酯粘度迅速增加,从而导致发泡反应困难,当添加量为7wt%时,压缩强度和冲击强度开始下降。

Preparation of Nano Silicon Dioxide Reinforced Rigid Polyurethane Foam

By power ultrasonic, nano silicon dioxide particles were dispersed into polyaryl-polymethylene-isocryanate(PAPI)and rigid polyurethane foams reinforced by nano SiO₂ were prepared by polymerization PAPI with polyether polyol. SEM was employed to observe the structures of SiO₂ filled polyurethane foam and showed that nano SiO₂ particles had been dispersed uniformly in foam. Results of mechanic test show that nano SiO₂ particles in low loading fraction can increase the compressed strength and impact strength of the rigid polyurethane foam. But the addition of nano SiO₂ conduces to the rapid accretion of viscosity of PAPI, which makes the foam reaction difficult to set in and the impact strength decreases with the addition of 7% nano SiO₂.