为了增强水性丙烯酸树脂涂料的物理性能，在超声波作用下，通过调控抗沉型分散剂的质量分数，成功制备出一种绿色改性的水性纳米氧化铝分散体，对水性纳米氧化铝分散体进行了表征，并对分散体复合市售水性丙烯酸树脂涂料进行了物理性能测试。结果表明：在分散剂质量分数为0.50%,超声波分散时间为0.5 h的条件下，制备的水性纳米氧化铝分散体的储存稳定时间大于90 d;在市售水性丙烯酸树脂涂料中添加质量分数为4%的水性纳米氧化铝分散体后，涂层的耐磨转数从小于5 r增大到15 r以上，抗刮载荷从1.10 kg增大到2.00 kg。

For enhancing the physical properties of water-based acrylic resin coating, a green modified water-based nano-alumina dispersion was successfully prepared by regulating mass fraction of anti-sedimentation dispersant under the condition of ultrasonication. Subsequently, the water-based nano alumina dispersion was characterized, and the physical properties of commercial water-based acrylic resin composite coating mixed with the dispersion were tested. Results showed that under the conditions of a dispersant mass fraction of 0.50% and an ultrasonic dispersion time of 0.5 h, the storage stability time of the prepared water-based nano-alumina dispersion was greater than 90 d. Besides, after adding 4%(mass fraction) water-based nano-alumina dispersion to commercially available water-based acrylic resin coatings, the wear-resistant rotation number of the as-obtained coating increased from less than 5 r to more than 15 r, and the scratch resistance load increased from 1.10 kg to 2.00 kg.