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以有机硅KH570为偶联剂,把硅溶胶引入到丙烯酸酯聚氨酯(PUA)中,采用原位分散聚合法制备了硅溶胶/有机硅改性丙烯酸酯聚氨酯(SPUA)复合材料,研究了KH570和硅溶胶的添加量以及硅溶胶与有机硅/丙烯酸酯聚氨酯的反应时间对SPUA复合材料平均粒径、附着力、硬度、耐水性和耐醇性的影响,获得了较佳的反应条件:KH5707.0%,硅溶胶5.5%,反应时间3h。通过红外光谱对较佳条件下制备的SPUA复合材料进行了表征,并与市售产品进行了综合性能对比研究。结果表明,SPUA复合材料出现了N─H弯曲振动吸收峰2046cm1,游离态N─H键的产生说明PUA的N─H键在有机硅的作用下产生电子偏移;硅溶胶的Si─O─H伸缩振动吸收峰从原来的3568cm1处移到了复合后的3442cm1处,且峰变宽,吸收强度变大,说明硅溶胶通过与有机硅作用接枝到PUA分子上。与市售产品比较,SPUA复合材料的硬度、附着力、耐水性和耐醇性等性能更好。
Silica sol was introduced into acrylate polyurethane (PUA) with silicone KH570 as coupling agent. Silica sol / silicone modified acrylate polyurethane (SPUA) composites were prepared by in-situ dispersion polymerization. The effects of KH570 and The optimum reaction conditions were obtained as the addition amount of silica sol and the reaction time of silica sol and silicone / acrylate polyurethane on the average particle size, adhesion, hardness, water resistance and alcohol resistance of SPUA composites. 0%, 5.5% silica sol, reaction time 3h. The SPUA composites prepared under the optimal conditions were characterized by infrared spectroscopy and compared with the commercially available products for comprehensive performance comparison. The results showed that the N-H bending vibration absorption peak of 2046cm1 was observed in SPUA composites. The production of free N-H bond showed that the N-H bond of PUA produced electron shift under the action of organic silicon. The Si-O-H The stretching vibration absorption peak moved from the original 3568cm1 to the composite 3442cm1, and the peak broadened and the absorption intensity became larger, indicating that the silica sol was grafted to the PUA molecule by the action of silicone. Compared with the commercial products, SPUA composite material hardness, adhesion, water resistance and alcohol resistance and other better performance.