IKN high-speed dispersing machine can handle large amount, run more smoothly, and is more convenient to disassemble and assemble. It is suitable for industrial online continuous production. The particle size distribution range is narrow, the dispersion effect is good, no dead angle, and the material is 100% dispersed and sheared.
From the perspective of equipment, what are the factors that affect the grinding and pulverizing structure?
From the perspective of equipment, the factors affecting the grinding and pulverizing results are as follows:
1 Form of colloid mill (horizontal and vertical) (vertical is better than horizontal colloid mill, the higher the vertical speed)
2 The shear rate of the colloid mill (the bigger the better the effect)
3 Tooth-shaped structure of colloid mill (divided into primary tooth, middle tooth, fine tooth, superfine tooth, the better the fine tooth effect)
4 The residence time of the material in the dispersion wall, the emulsification dispersion time (can be regarded as the same motor, the smaller the flow rate, the better the effect)
5 The number of cycles (the more, the better the effect, the time limit for the device, it can't be better)
Line speed calculation
The shear rate is defined as the relative velocity of the liquid layer between the two surfaces.
– Shear rate (s-1) = v rate (m/s)
g stator-rotor spacing (m)
As can be seen from the above, the shear rate depends on the following factors:
– the linear rate of the rotor
– In this case, the distance between the two surfaces is the rotor-stator spacing.
IKN stator-rotor spacing ranges from 0.2 to 0.4 mm
Rate V = 3.14 X D (rotor diameter) X speed RPM / 60
Layering theory of suspension
Layering is the result of the floating phase sinking or sinking in the continuous phase under the action of external forces (gravity or centrifugal force). Under the static condition of ignoring the Brownian motion effect, Stokes' law can be used to describe that the sedimentation velocity V of the dispersed phase spherical particles due to gravity is determined by the following formula:
In the middle
Ρs -Ï is the density difference between the dispersed phase and the continuous phase, g is the acceleration of gravity, d is the diameter of the dispersed phase particles, and μ is the viscosity of the continuous phase. If the density of the dispersed phase particles is greater than the density of the continuous phase, the particles sink and the velocity V is positive. Conversely, the particles float and the velocity is negative. The sedimentation speed is large and the slurry is easily delaminated. If the system is to be stable, the settling velocity must be reduced. For a particular slurry, the diameter d of the dispersed phase solid particles can be reduced. Because only when the particle size is reduced to the size of the liquid phase of the continuous phase, the particles can be stably and uniformly dispersed in the liquid without separation.
From the above analysis, we can see that to increase the stability of the suspension, the particle size of the dispersed phase particles should be as small as possible. However, it should be pointed out that according to a large number of studies done by the predecessors, as the particle size decreases, although the separation caused by gravity becomes a secondary factor, the spacing between the particles decreases. The combination of force (Van Dehuali, etc.) played an important decisive role. In addition, when the particle diameter is smaller than a certain small size, at this time, the Brownian motion effect of the particles cannot be ignored, so that the particles collide with each other due to the Brownian motion of the fine particles. If no stabilizer is added, these conditions will lead to particle agglomeration, which is detrimental to the stability of the system. Therefore, in the dispersion of the slurry, the particle size is not as fine as possible, depending on the characteristics of the slurry. Dispersion is to reduce the particle size of the dispersed phase particles according to the characteristics and characteristics of the material, so that it is distributed in a narrow size range, and achieve the balance between suction and repulsive force, so as to ensure the stability of the slurry system.
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