纳米二氧化钛增强硬质聚氨酯泡沫塑料的制备

Preparation of Nano Titanium Dioxide Reinforced Rigid Polyurethane Foam

采用功率超声,将纳米二氧化钛颗粒分散到多次甲基多苯基多异氰酸酯(PAPI)体系内,然后与聚醚多元醇聚合制得了纳米二氧化钛增强的硬质聚氨酯泡沫塑料。SEM分析表明纳米二氧化钛均匀分散在聚氨酯泡沫塑料中。在较低添加量时纳米二氧化钛对压缩强度和冲击强度有一定提高,但会引起PAPI粘度迅速增加,从而导致发泡反应困难,当添加量为10%(质量分数)时压缩强度和冲击强度开始下降。

By power ultrasonic, nano titanium dioxide particles were dispersed into polyaryl-polymethylene-isocyanate (PAPI), and rigid polyurethane foams (RPU) reinforced by nano TiO2 were prepared by polymerization PAPI with polyether polyol. SEM was employed to observe structures of TiO2-filled polyurethane foam and showed that nano TiO2 particles had been dispersed uniformly in foam. Results of mechanic test show that nano TiO2 particles in low loading fraction can increase the compress strength and impact strength of rigid polyurethane foam. But addition of nano TiO2 led to the rapid accretion of viscosity of PAPI, which made the foam reaction difficult and contributed to the impact strength decrease in addition of 10% nano TiO2.