（1）表面改性。改性物质为六甲基二硅氮烷，加入后其在二氧化硅表面水解，反应取代二氧化硅表面其中一个羟基。将适量的二氧化硅放入三口瓶容器中，搅拌、加热并恒温放置一段时间。再取一定量乙醇置于三口瓶中，搅拌分散均匀后加入六甲基二硅胺烷，升温至回流温度进行反应。反应完毕后，用乙醇离心洗涤3次所得悬浮液，并将其干燥至重量恒定即得改性二氧化硅纳米颗粒。
(1) surface modification. The modified material is six methyl two silicon nitrogen. After adding, it is hydrolyzed on the surface of silicon dioxide, which replaces one of the hydroxyl groups on the surface of silicon dioxide. Put the right amount of silicon dioxide into three container, stir, heat and keep it for a period of time. Take a certain amount of ethanol in the three bottle, stir evenly dispersed after adding six methyl two silizane, heating to reflux temperature for reaction. After the reaction, the suspension obtained by washing 3 times with ethanol and then dried to a constant weight is obtained with modified silica nanoparticles.
（2）强力机械搅拌。调节搅拌器转速逐渐升至1600r/min，时间30分钟，搅拌完成后，密闭封装，置于阴凉干燥处静置。搅拌装置和制作得到的不同浓度的改性油。
(2) strong mechanical agitation. Adjust the agitator speed up to 1600r/min, time 30 minutes, after mixing, sealed package, placed in a cool and dry place, static. A mixing device and a modified oil obtained at different concentrations are obtained.
（3）超声分散。将机械搅拌后的纳米油进行超声分散，以去除机械搅拌过程中溶入的气泡。放入超声仪器中设置功率180W去气泡30分钟。
(3) ultrasonic dispersion. The nano oil after mechanical agitation was dispersed by ultrasonic to remove the bubbles dissolved during the mechanical agitation. In ultrasonic equipment, set power 180W to bubble for 30 minutes.
（4）分子筛。采用3A型分子筛对纳米油进行脱水处理，将分子筛加热至300℃进行活化处理，持续3-4小时，然后隔绝空气冷至室温。将分子筛加入纳米油，静置24小时，再将分子筛去除即得纳米改性变压器油.
(4) molecular sieves. 3A zeolite was used to dehydrate the nano oil. The zeolite was heated to 300 degrees for 3-4 hours, and then isolated from the air to room temperature. Add the molecular sieve to the nano oil for 24 hours, then remove the molecular sieve, then get nano modified transformer oil
