1. Design of stirring device:
Equipped with a high-speed stirring shaft, usually a serrated or turbine-shaped dispersion disc is installed. When rotating at high speed, a strong shear force is generated around the dispersion disc, which can break up the agglomerated materials and evenly disperse them into the liquid. For example, in paint production, high-speed stirring can make the pigment particles evenly dispersed in the resin solution.
Some dispersion kettles are also equipped with low-speed anchor agitators. It can form a large circulation flow at the bottom and edge of the kettle body, assist the high-speed dispersion shaft, promote the overall circulation of materials, prevent the bottom material from depositing, and ensure that the materials in all parts of the kettle can fully participate in the dispersion process, so as to achieve more comprehensive and thorough mixing and dispersion.
2. Kettle body structure optimization:
The interior of the kettle body is designed as a smooth structure to reduce the material hanging on the wall and dead corners, so that the material can flow smoothly and evenly during the stirring process, which is conducive to dispersion.
Some dispersion kettles will be equipped with guide plates. Its function is to change the flow direction of the material, so that the material forms a regular circulation flow path, avoid turbulence and local stagnation, promote full collision and mixing between materials, and thus improve the uniformity of dispersion.
3. Process condition control:
Precisely control the stirring speed. According to the material characteristics and dispersion requirements, start at a lower speed in the initial stage to make the materials initially mixed, and then gradually increase the stirring speed to the appropriate dispersion speed to achieve efficient dispersion. For example, when dispersing high-viscosity materials, low-speed stirring in the initial stage can prevent equipment overload, and subsequent high-speed dispersion can effectively break up agglomerations.
Reasonably control the temperature. For some material systems that are greatly affected by temperature, the temperature in the kettle can be adjusted by heating or cooling the jacket to reduce the viscosity of the material, improve fluidity, and facilitate dispersion. For hot-melt materials, heating reduces their viscosity and makes it easier to achieve uniform dispersion.
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