After the 3D mixer is working, what is the mixing effect? Is there a way to detect the mixing effect of the 3D mixer? What are the detection methods? There are several ways to detect the mixing effect of a three-dimensional mixer:
First, a qualitative visual method--the visual detection method is introduced. When the dispersion of the carbon black was judged, the dispersion level of the carbon black was evaluated by comparing the observed sample incision with a set of standard photographs, and the results were expressed by numerical values. This is a method recommended by the American Society for Testing and Materials (ASTM, American Society for Testing and Material).
The specific method is: tearing or cutting the mixture sample (and some appropriate treatment) to expose the fresh surface, and observe it with the naked eye, preferably under a magnifying glass or a low-magnification binocular microscope. The dispersion of carbon black was compared with a set of 5 standard photographs, and then the grade was evaluated. So this method is also called the comparative sample method. The visual dispersion level is related to some important physics of the mixture. The method evaluates the dispersion level of carbon black in five grades. A rating of 5 indicates that such a dispersed state brings these physical properties closest, and a mixed state at a level of 1 causes these properties to be significantly degraded.
The agglomeration counting method relies on the percentage of carbon black agglomerates in the optical microscope mixture section to assess the degree of dispersion of the mixture. Since this method involves direct measurement, it is more accurate than visual observation for quantitative measurement and is a method used by ASTM.
The specific method is as follows: the mixture is cut into thin enough slices, and after some treatment, it is placed under transmitted light, and the carbon black agglomerates are observed by an optical microscope. The magnification of the optical microscope is between 75 and 100 times. The eyepiece used for counting contains a grid of 1 cm2 size divided into 10,000 small squares. The area occupied by all carbon black agglomerates of not less than 5 μm was calculated. The percentage of carbon black agglomerates having a size of 5 μm can be derived from the known carbon black content in the material, expressed as "percentage of carbon black dispersion".
There are many other methods for directly judging the mixed state, such as photoelectric method. The principle is: a 40 μm pattern sheet made of a mixture of LDPE and carbon black is processed and scanned under a luminometer. Since the size of the carbon black micelles is extremely unevenly distributed, the transmitted light intensity is also different. Optical microscopy and electron microscopy are commonly used qualitative methods for directly observing the morphological structure of a mixture.
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