摘要： 采用阴离子表面活性剂十二烷基苯磺酸钠(SDBS)为分散剂,对自制的复合ZnO-CeO2纳米颗粒进行分散。采用FT-IR、XRD和TEM对分散后的样品进行表征。将最佳分散条件下的纳米颗粒经预分散后,加入到自制的水性外墙涂料中,采用紫外-可见分光光度计、紫外灯照射、紫外光耐气候试验箱对样品进行性能测试,并根据国标GB/T 9775—2001检验其性能。研究表明:在50 mL去离子水中,用1.5 g SDBS分散0.5 g复合ZnO-CeO2纳米颗粒,pH为5、超声时间为20 min、温度为50℃时分散最佳。由TEM观察到处理后团聚现象明显降低,XRD显示处理前后晶型无变化,FT-IR显示出分散剂的特征峰。改性涂料中纳米颗粒添加量为1.0%时改性涂料的紫外吸收效果最好,并且表现出良好的紫外吸收稳定性。添加纳米颗粒的涂料的耐人工老化性能较未添加的提高90%,比国标中优等品的要求提高58%。

关键词: 复合ZnO-CeO₂纳米颗粒, 十二烷基苯磺酸钠, 分散, 紫外吸收, 水性涂料

Abstract: An anionic surfactant (SDBS) as dispersant was used to disperse the self-made composite ZnO-CeO₂ nanoparticles to form the nanomaterial which was characterized by Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction(XRD) and transmission electron microscopy(TEM). The dispersed nanoparticles under optimal dispersing condition were incorporated into the self-made waterbome coatings for exterior walls to give a cured sample, properties of which were investigated by spectrophotometer, UV radiation and Uv-ageing tester according to the national standard GB/T 9775-2001. The result showed that the optimal dispersing condition was SDBS dosage 1.5g, pH 5, ultrasonic dispersing time 20 min and temperature 50℃ for the ZnO-CeO₂ nanoparticles 0.5 g in deionized water 50 mL.TEM showed that the agglomeration of nanoparticle composite system was reduced dramatically.XRD showed no change in terms of crystal form before and after treatment. FT-IR indicated characteristic peaks of dispersant. The coatings modified with nanoparticles 1. 0% could gave optimal UV absorption and stability. Moreover the weatherability of the modified coatings was increased by 90% over the unmodified coatings, and was increased by 58% over the high-end products described in the national standard.

Key words: ZnO-CeO₂ composite nanoparticle, SDBS, dispersion, UV absorption, waterborne coatings