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以甲苯二异氰酸酯(TDI)、聚己内酯二元醇(PCL)、端羟基聚二甲基硅氧烷(DHPDMS)和二羟甲基丙酸(DMPA)为主要原料,通过自乳化的方法合成DHPDMS改性聚氨酯微球。考察了n(NCO)/n(OH)、DHPDMS的质量分数、DHPDMS的分子量、乳化时间和CaCl2浓度对改性聚氨酯溶液外观、黏度(η)、溶胀率(Sw)以及微球的形态和硬度等性能的影响。并通过FTIR和SEM表征微球的化学结构和表面形态结构。FTIR表明硅氧键引入到聚氨酯中;SEM照片显示改性聚氨酯微球为表面多孔隙球形,直径为2 mm左右,内有空腔,空腔直径为1 mm左右。结果表明,DHPDMS质量分数为8%、分子量为4500时改性聚氨酯微球的耐水性和力学性能都有明显的提高。
Using TDI, PCL, DHPDMS and DMPA as the main raw materials, self-emulsifying Synthesis of DHPDMS modified polyurethane microspheres. The appearance, viscosity (η), swelling rate (Sw) and morphologies and hardness of the modified polyurethane solution were investigated in terms of the mass fraction of n (NCO) / n (OH) and DHPDMS, the molecular weight of DHPDMS, the emulsification time and the concentration of CaCl2 Such as the impact of performance. The chemical structure and surface morphology of the microspheres were characterized by FTIR and SEM. FTIR indicates that the siloxane bond is introduced into the polyurethane. The SEM photographs show that the modified polyurethane microspheres are spherical surface with a diameter of 2 mm and have a cavity with a cavity diameter of about 1 mm. The results show that the water resistance and mechanical properties of the modified polyurethane microspheres are obviously improved when the mass fraction of DHPDMS is 8% and the molecular weight is 4500.