目的 为了提高纳米氧化镁在有机介质中的分散性能。方法 利用油酸钠作为改性剂改性纳米氧化镁粉体， 探究其最佳的改性条件。结果 确定了油酸钠改性纳米氧化镁的最佳改性条件， 油酸钠质量分数为8%， 改性时间为50 min， 改性pH值为10， 改性温度为50 ℃。在此条件下， 纳米氧化镁的改性效果佳， 亲油化度可达50.4%。通过沉降对比实验可知， 改性后的纳米氧化镁具有良好的分散性能， 并将改性后的纳米氧化镁添加于油墨之中， 经测试可知添加改性纳米氧化镁的油墨抗菌效果更好。结论 利用油酸钠改性纳米氧化镁可提高其分散性能， 并表现出效果更佳的抗菌性。

In order to improve the dispersion of nano magnesium oxide, sodium oleate was used to modify nano magnesium oxide to find out the best modifying condition. The experimental results determined the optimum modifying condition as follows: sodium oleate with the mass fraction of 8% , the modification time 50 min, the pH value of modification 10, and the modification temperature 50 ℃. In this condition, nano magnesium oxide was best modified, as the oleophylic degree can be up to 50.4%. The modified nano magnesium oxide had better dispersion performance through the settlement experiment. The test showed that it also had better antibacterial performance when it was added to ink. Using sodium oleate to modify nano magnesium oxide can improve the dispersion performance and shows a better antibacterial performance.