The Research Of Determination Of Diameter-thickness Ratio In Mica Powder

In the applications of mica powder, the diameter-thickness ratio is a very important parameter. Because the smaller the diameter-thickness ratio of the mica powder, the reflection is worse and the brightness is worse, the diameter-thickness ratiois a very factor what can impact the function of the mica powder. Many industries need the diameter-thickness ratio such as pearlescent pigment, special coating, daily chemical industry and building materials industry, so it is very important to determine the diameter-thickness ratio of mica powder. But now there is not uniform national criterion, trade criterion and mensuration. How to get the diameter-thickness ratio of mica powder fast is a key point to improve the quality of mica powder. It is significance to get the mensuration which is fast and simple in our mica industry and international mica field. Now, it need SEM and expensive test cost. Many better conclusions are got by a lot of experiment and analysis such as the measure of diameter, the thickness diameter-thickness ratio and the mathematic formulary.The determination method of the diameter,when determine the diameter, the mica is analyzed by the method of sedimentation classification, laser particle sizer and optical microscope to get the best method—use the optical microscope to get the picture. And then use the statistical method Martin to get the diameter.The determination method of the thickness of the mica powder, when determine the thickness, the method of epoxy resin, squash method, boiling adhesive, the method of stacking cover glasses and half stacking cover glasses are studied during the research in the paper to get the optimal method—the method of half stacking cover glasses.The determination method of diameter-thickness ratio, when get the diameter and the thickness, the paper sue two method to deal with the data-d50 and the average diameter. They are very similar in the data. We choose the d50 as the criterion because it is median diameter and the average diameter.The mathematic formulary of the diameter-thickness ratio,the paper use two method to get the mathematic formulary. The relation between diameter-thickness ratio and stack height are researched in the paper and get the influencing factors of the stack height, then make the best condition o in the experimentation which can determine the stack height of mica powder. The relation between diameter-thickness ratios and the weight of monolayer are research in the paper and get the optimistic method which can get a monolayer mica powder.The validation of mathematic formulary, one mica powder is used to validate the formulary and there is a little discrepancy between the results. The discrepancy in the stack height is 2%-8%. The discrepancy in the weight of monolayer is 6%-12%. It is prove that formulary has significance.