Surface modification method of ultrafine diamond powder

Abstract: The present invention discloses a surface modification method of ultra-fine diamond powder, which includes the following steps: 1) mixing and stirring the ultra-fine diamond powder and a dispersant solution, and then solid-liquid separation for filtration and impurity removal; 2) Step 1 ) The obtained ultra-fine diamond micropowder wet material is dried by flow drying to obtain surface-modified ultra-fine diamond micropowder. After being modified by the surface modification method of the present invention, the ultra-fine diamond micropowder can not only be stably dispersed in the water system, but also suitable for the polishing of high-end precision products such as semiconductors and optical lenses, and has extremely high polishing efficiency and good polishing quality. There are no scratches after polishing, which can avoid damage to the polished workpiece, and can meet the requirements of today's high-end precision product technology field

Main claim:
1. a surface modification method of ultra-fine diamond micropowder, is characterized in that, comprises the following steps: 1) ultrafine diamond micropowder and dispersant solution are mixed and stirred, then solid-liquid separation is carried out to filter and remove impurities; 2 ) Dry the ultrafine diamond micropowder wet material obtained in step 1) by flow drying to obtain a surface-modified ultrafine diamond micropowder.

2. the surface modification method of ultrafine diamond micropowder according to claim 1, is characterized in that, in step 1), the dispersant of described dispersant solution is selected from sodium lauryl sulfate, dodecylbenzene one or more of sodium sulfonate and polyethylene glycol 2000, and the solvent is deionized water.

3. the surface modification method of ultrafine diamond micropowder according to claim 2, is characterized in that, described dispersant is sodium dodecyl sulfate, sodium dodecylbenzene sulfonate and polyethylene glycol 2000, The molar ratio between the three is 1:0.15-0.25:0.45-0.55.

4. The method for surface modification of ultrafine diamond micropowder according to claim 1, wherein in step 1), the molar concentration of the dispersant solution is 0.002-0.008mol/L.

5. the surface modification method of ultrafine diamond micropowder according to claim 1, is characterized in that, in step 1), in described dispersant solution, the mass ratio of dispersant and ultrafine diamond micropowder is 1/1000-5 /1000.

6. The surface modification method of ultrafine diamond micropowder according to claim 1, is characterized in that, in step 1), the time of mixing and stirring is 30-60 minutes.

7. The method for surface modification of ultrafine diamond micropowder according to claim 1, wherein in step 2), the flow drying method is to use a disc dryer to dry.

8. The method for surface modification of ultrafine diamond micropowder according to claim 1, wherein in step 2), the drying temperature is 100-150°C.