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采用钛酸酯偶联剂干法改性高岭土,配成母液,用此母液乳化中和后的聚氨酯预聚体,制得改性高岭土/水性聚氨酯复合材料(WPUM)。研究了复合材料的乳液粒径、胶膜力学性能、结晶性和热稳定性等性能。结果表明:复合材料乳液粒径随着改性高岭土质量分数的增加,先增加后减小;改性高岭土的加入可以明显提高水性聚氨酯胶膜的力学性能,当改性高岭土质量分数为1.6%时,复合材料的断裂伸长率与纯聚氨酯胶膜相比提高了13%;X射线衍射法(XRD)分析结果显示,改性高岭土促进了聚氨酯的微相分离;热重分析法(TG)、差示热重法(DTG)分析结果表明,水性聚氨酯复合材料胶膜热分解的起始温度无变化,硬段最高热失重温度略有降低。
The kaolin was dry-modified with titanate coupling agent to prepare a mother liquid, and the mother liquid was used to emulsify the neutralized polyurethane prepolymer to obtain a modified kaolin / waterborne polyurethane composite (WPUM). The properties of emulsion particle size, mechanical properties, crystallinity and thermal stability of the composites were studied. The results showed that the particle size of the composite latex increased first and then decreased with the mass fraction of modified kaolin. The addition of modified kaolin could obviously improve the mechanical properties of the aqueous polyurethane film. When the modified kaolin mass fraction was 1.6% , The elongation at break of the composites increased by 13% compared with that of pure polyurethane film. The results of X-ray diffraction (XRD) showed that the modified kaolin promoted the micro-phase separation of polyurethane; the thermal gravimetric analysis (TG) The results of differential thermal gravimetric analysis (DTG) showed that there was no change in the initial temperature of thermal decomposition of aqueous polyurethane composite films, and the maximum temperature of the hard segment decreased slightly.