聚氨酯微球功能材料的制备与表征

Preparation and Characterization of Polyurethane Microsphere

以聚醚多元醇 ( 63 5)及多苯基多亚甲基多异氰酸酯 (PAPI)为原料 ,在液体石蜡和CaCO3中进行反相悬浮聚合 ,制成了聚氨酯微球。考察了分散剂种类及用量、异氰酸酯与羟基的比例、聚合温度、搅拌速度等因素对成球的影响。用DSC法测定了微球的Tg、Td,测定了 2 0 0℃下的失重率。通过BET法测定了微球的压碎强度、耐酸碱性及耐溶剂性。证明了用本法所合成的PU微球有较好的抗耐性 ,较高的抗压强度和较好的吸附性能。

Polyuretane microspheres based on polyether polyols (635) and PAPI were prepared by counter -phase suspension polymerization in liquid wax and CaCO3. The effects of species and doses of dispersers, poly-merication temperature, rate of whip on the formation of microspheres were inspected. The Tg and Td of the microspheres were determined by DSC method, and ratio of weight loss at 200℃ were tested, too. The specific surface areas of micropheres, the diameter and the volume of pore and curve of adsorption and desorption were determined by BET method. The crushing strength, acid, base and solvent resistance of the micropheres were tested. It has proved that the PU micropheres prepared by this method have high resistance, high crushing strength and good adsorbability.