What is dispersion and factors affecting dispersion effect
What is scatter sum Factors affecting the dispersion effect
What is scatter
Dispersion is the performance of fine particles suspended in a dispersion medium without settling.
The flocculation group or droplet of dispersible solid particles can be dispersed into fine particles suspended in the dispersion medium without settling in water or other uniform liquid media.
Dispersion is when solid particles are dispersed into a liquid, forming a suspension. An emulsion forms when one liquid disperses into another liquid. At the interface between the two liquid phases of an emulsion, surface tension begins to act. In the absence of external influences, each liquid phase system attempts to achieve the emulsion state with less. Therefore, there is always a tendency to create smaller interfaces, which hinders the formation of any emulsion.
In order to achieve the dispersion of mutually immiscible phases, they must be vigorously crushed and mixed particle. Crushing means that surface tension must be overcome to form a new surface. The dispersion process delivers the required energy and ensures homogeneous mixing of the two phases. Dispersed * stableProperties can be affected by the exact particle size distribution and the use of emulsifiers and stabilizers.
In many industrial fields, slurry dispersion is a key quality indicator. If the dispersion of the slurry is not good, it will cause many problems, such as precipitation, hindered catalytic reaction, reduced product quality, etc.
Manager Zhang: 13861770816
Factors that affect the dispersion effect
Factors that affect the dispersion effect The factors are:
1. Equipment factors: shear mixing or dispersing ability
1 The form of the dispersing head (batch and continuous) (continuous is better than batch)
2 The shear rate of the dispersing head (the larger, the better the effect)
3 The tooth structure of the dispersing head (divided into primary teeth, medium teeth, fine teeth, ultra-fine teeth, about fine teeth The better the tooth effect is)
4 The residence time of the material on the dispersion wall, the emulsification and dispersion time (can be regarded as the same motor, the smaller the flow rate, the better the effect)
5 Cycle Frequency (the more, the better the effect. When the equipment expires, it cannot be better)
2. Dispersant
Dispersant can stabilize the solid particles in the solid-liquid suspension. Surfactants dispersed in a medium are called dispersants. Dispersion is the process of uniformly distributing solid particles in a dispersion liquid, and the dispersion liquid has a certain stability.
Principle of action:
1. Adsorbed on the surface of solid particles, making the surface of the agglomerated solid particles easy to wet
2. Polymer dispersant, An adsorption layer is formed on the surface of solid particles, which increases the charge on the surface of solid particles and increases the reaction force between particles that forms a three-dimensional hindrance.
3. Form a bilayer structure on the surface of the solid particles. The polar end of the outer dispersant has a strong affinity with water, which increases the degree of wetting of the solid particles by water. Stay away due to electrostatic repulsion
4. Make the system uniform, increase the suspension performance, and prevent precipitation, so that the physical and chemical properties of the entire system are the sameAs mentioned above, the use of dispersants can stably disperse solid particles in liquids.
3. Solvent
The polarity, viscosity, surface tension, etc. of the solvent will affect the dispersion of the slurry. Generally speaking, choosing a solvent with similar interaction force with the particles can improve dispersion; while a solvent that is too viscous or has a high surface tension will make dispersion more difficult.
IV. Physical and chemical properties of the slurry
The particle size, shape, density and surface properties of the slurry will all affect the dispersion. For example, if the particles are too large or irregular in shape, it will be difficult to disperse evenly in the liquid: if the density difference is large, stratification will occur during stirring; and the surface properties will affect the interaction between the particles and the liquid. The interaction force between them further affects the dispersion.
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Tel: Manager Zhang 138-6177-0816 (same number as WeChat)
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