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How to Choose a Shear Mixing Emulsion Pot and Colloidal Mill


Release time:

2019-07-22

High shear dispersion emulsification is the process of efficiently, rapidly and uniformly transferring one or more phases (liquid, solid, gas) into another immiscible continuous phase (usually liquid). In general, the phases are immiscible with each other. When external energy is input, the two materials recombine into a homogeneous phase. Due to the high tangential speed generated by the high-speed rotation of the rotor and the strong kinetic energy brought by the high-frequency mechanical effect, the material is subjected to strong mechanical and hydraulic shear centrifugal extrusion, liquid layer friction, impact tearing and turbulence in the narrow gap between the stator and the rotor, forming suspension (solid/liquid), emulsion (liquid/liquid and foam)

High shear dispersion emulsification is the process of efficiently, rapidly and uniformly transferring one or more phases (liquid, solid, gas) into another immiscible continuous phase (usually liquid). In general, the phases are immiscible with each other. When external energy is input, the two materials recombine into a homogeneous phase. Due to the high tangential speed generated by the high-speed rotation of the rotor and the strong kinetic energy brought by the high-frequency mechanical effect, the material is subjected to strong mechanical and hydraulic shear centrifugal extrusion, liquid layer friction, impact tearing and turbulence in the narrow gap between the stator and the rotor, forming suspension (solid/liquid), emulsion (liquid/liquid and foam (gas/liquid). So that the immiscible solid phase, liquid phase, gas phase in the corresponding mature process and the right amount of additives under the joint action, instant uniform fine dispersion emulsification, after high frequency cycle back and forth, finally get stable high quality products.
colloid mill
The colloid mill is driven by a motor through a belt drive to rotate the rotating tooth (or called rotor) and the matching fixed tooth (or called stator) at a relatively high speed. The processed material is pressurized by its own weight or external pressure (which can be generated by a pump) to generate a downward spiral impact force. Through the gap between the fixed and rotating teeth (the gap is adjustable), it is subjected to strong shearing force, friction force, high frequency vibration and other physical effects, the material is effectively emulsified, dispersed and crushed to achieve the effect of ultrafine crushing and emulsification of the material. From the principle point of view, they are used for grinding and crushing. The refining effect of colloid mill is generally weaker than that of emulsifying pot, but it has strong adaptability to materials (such as high viscosity and large particles), and their material flow direction is easier to flow down. Therefore, in many occasions, it is used in the front of homogenizer or in high viscosity occasions.
When there are many solid substances, colloid mill is often used for refinement. However, the specific situation depends on the material. If it is finely ground, it is recommended to use colloid mill, such as more than 100UM, which can be finely ground. If the original material particles are relatively small, emulsification is generally used, such as 1-20UM, which can be finely ground. If the solid content of the material is relatively high, it is recommended to use colloid mill, such as peanut butter titanium dioxide, white carbon black and other functions.
Advantages of Colloidal Mill
Compared with the shear mixing emulsifier, the colloid mill is first of all a centrifugal equipment, which has the advantages of simple structure, convenient equipment maintenance and maintenance, suitable for higher viscosity materials and larger particles of materials. Its main disadvantage is also determined by its structure. First of all, due to the centrifugal movement, the flow rate is not constant, and the flow rate varies greatly for different viscous materials. For example, the same equipment, when dealing with viscous lacquer materials and thin milk fluids, the flow rate can differ by more than 10 times. Secondly, due to the high-speed friction between the rotor and the material, it is easy to generate large heat and denature the treated material. Third, the surface is easy to wear, and after wear, the refinement effect will be significantly reduced.