Jan 12, 2022
Among the existing equipment, the grinding and dispersing machines are mostly two independent equipment. The crushed materials must be dispersed through another process, which will seriously affect the working efficiency of the equipment. Moreover, for materials with different viscosities, the grinding and dispersing range is very wide.
When the cutter head rotates at a high speed, the cutter head rotates at a high speed to generate a strong shearing force, and the material generates heat, which causes the temperature in the tank to rise. When handling liquid materials, stop using the cooling jacket.
In fact, if too little heat is generated during the dispersion process, the dispersing machine will be considered inefficient or non-dispersing. However, the increase in the temperature of the slurry will cause some undesirable effects. Temperature rise, even a small temperature rise, will greatly reduce the viscosity of the material, turning laminar flow into turbulent flow, and the kinetic energy of turbulent flow will immediately be converted into heat, leading to undesirable temperature rise. Subsequently, the dispersion effect is replaced by the thermal synergy effect, and the dispersion machine will only waste time and energy. In addition, the increase in material temperature can cause damage to additives, evaporation loss or reduced efficiency. The solubility of the ionic wetting and dispersing agent in the aqueous solution increases with the increase of temperature, and the amount of adsorption on the solid-liquid interface decreases, thus affecting the use effect.
It is a better method to use jacketed containers and use cooling water in the jacket to cool the materials. It is also possible to use intermittent stirring, that is, when the slurry temperature rises to a certain value, stop stirring for a period of time, and then stir at high speed after the material is cooled, or use low speed stirring to fully pre-mix to obtain high-quality pigment agglomerate slurry , And can quickly disperse in a short time. The material temperature should not be too high during the dispersion operation.
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