Analysis of the advantages and disadvantages of excessive speed of emulsifier

Analysis of the advantages and disadvantages of excessive speed of emulsifier

Emulsifiers play an important role in industrial equipment mixing systems, especially in solid-liquid mixing, liquid-liquid mixing, oil-water emulsification, dispersion homogenization, and shear grinding. The reason why it is called an emulsifier is that it can achieve emulsification. The oil-water two-phase medium is thoroughly mixed to form an emulsion, which is divided into two types: water-in-oil or oil-in-water. To achieve emulsification, there are at least two requirements: First, strong mechanical cutting and dispersion, the water phase and the oil phase The fluid medium is simultaneously cut and broken into small particles, and then merged and merged to form an emulsion. The second is a suitable emulsifier, acting as a medium bridge between oil and water molecules. Through the action of its charge and intermolecular force, the oil-water mixed emulsion can be stably stored according to the time we need.

Now the application of the emulsifier is not limited to 'emulsification', its unique shearing action, the pulverization impact of the granules in the liquid is finally refined to the desired particle size, so that the solid matter is fully blended into the liquid and formed. For a relatively stable suspension, this process is also 'dispersed'. Of course, as with the emulsifier, the stability of the suspension can be enhanced by the addition of a dispersing agent. When a solid substance is completely dissolved by the liquid by contact with the liquid for a certain period of time, the small particles formed by the shearing impact will be dissolved by the liquid more quickly because the specific surface area is increased by many times.

When people get used to obtaining fine particles through a high-pressure homogenizer, the 'fine' is equal to the 'homogeneous', so the effect of the emulsifier on the refinement and thorough blending of the material is 'homogeneous'. 'The process is gone. Therefore, we can also refer to the emulsifier as a homogenizer. For easy differentiation, it can generally be crowned with high-speed or high-shear homogenizers, so that there are many kinds of emulsification machines: high shear emulsifier, high shear Cutting homogenizer, high shear dispersing emulsifier, high shear homogenizing emulsifier, high shear homogenizing dispersing emulsifier.

The strength of the shearing action of the emulsifier directly affects the final fineness. After analysis, it is mainly related to the sharpness of the blade, the hardness, the stator gap, the relative movement speed of the two cutting edges and the allowable particle size. Under the knife edge sharpness, hardness, stator gap and allowable particle size have been basically fixed or do not want to change, then the relative movement speed of the knife edge is the most influential factor, expressed as the circumferential speed of the rotor, the line speed High, the density of the cutting or impact of the radially flowing fluid is high, so the refinement is strong, and vice versa. However, the line speed is not as large as possible. When it reaches a very high value, there is a tendency to form a barrier flow, so that the flow rate becomes small, and the heat is high, and some materials are in turn aggregated, so that the result is not satisfactory.