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以聚醚多元醇(635)及多苯基多亚甲基多异氰酸酯(PAPI)为原料,在液体石蜡和CaCO_3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T_g、T_d,测定了200℃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。
Polyurethane polyols (635) and polyphenyl poly-methylene polyisocyanates (PAPI) were used as starting materials in the reverse phase suspension polymerization of liquid paraffin and CaCO 3 to prepare polyurethane microspheres. The effects of the type and amount of dispersant, the ratio of isocyanate to hydroxyl, the polymerization temperature and the stirring speed on the formation of spheres were investigated. The T_g and T_d of the microspheres were determined by DSC, and the weight loss rate was measured at 200 ℃. The crushing strength, acid and alkali resistance and solvent resistance of the microspheres were determined by BET method. It is proved that the PU microspheres synthesized by this method have better resistance, higher compressive strength and better adsorption performance.