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3 h。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2046 cm?1，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3568 cm?1处移到了复合后的3442 cm?1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。
A composite material of silica sol/acrylate polyurethane modified by organic silicon (SPUA) was prepared by in-situ dispersion polymerization with organic silicon KH570 as coupling agent and silica sol incorporated into acrylate polyurethane (PUA). The effects of the amounts of KH570 and silica sol as well as the reaction time of silica sol with organic/acrylate polyurethane on average particle size, adhesion, hardness, water resistance, and alcohol resistance of the SPUA composite material were studied. The optimal reaction conditions were obtained as follows:KH570 7.0%, silica sol 5.5%, and reaction time 3 h. The SPUA composite material prepared under the above conditions was characterized by infrared spectroscopy, and its comprehensive performances were compared with that of commercial product. The results showed that a N─H bending vibration absorption peak appears at 2 046 cm?1 for SPUA composite material, and the formation of free N─H bond indicates that the N─H bond of PUA produces electron shifting as a results of the action of organic silicon. A wider Si─O─H flexing vibration absorption peak of silica sol shifts from 3 568 cm?1 to 3 442 cm?1 and becomes wider and stronger after composition, showing that silica sol is grafted to PUA molecule through its action with organic silicon. The hardness, adhesion, water resistance, and alcohol resistance of the SPUA composite material are better in comparison with that of the commercial product.
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