Compared with three roller mills, ball mills, and sand mills, a high-speed disperser has the obvious advantages of high efficiency and low energy consumption and is the first choice of dispersion process.

The need for decentralization

As we all know, nano oxide is easy to produce its agglomeration, which makes it difficult to give full play to its due performance. In addition, whether the singular properties of nano oxides can be brought into full play depends on minimizing the surface tension between the powder and the medium. Therefore, nano oxide powder must be evenly dispersed and its aggregates must be fully opened to give full play to its unique properties.

Decentralized mode

The dispersion of powders (including nanomaterials) in coatings mainly depends on the effect of shear force. The dispersion of nanomaterials in the coating system is generally achieved by the following dispersion methods.

Grinding dispersion

Using the different speeds between the rollers of the three roller machine or the multi roller machine, the abrasive is put into the feeding ditch between the feeding roller (rear roller) and the middle roller. The two rollers rotate inward at different speeds, and part of the abrasive enters the feeding seam and is subject to a strong shearing effect. Through the feeding seam, the abrasive is divided into two parts, one part is attached to the feeding roller and returns to the feeding ditch, and the other part is brought by the middle roller to the paint scraping seam between the middle roller and the front roller, Here again, it is subjected to a stronger shear force. After the paint scraping seam, the abrasive is divided into two parts. One part is brought by the front roller to the scraper and falls into the paint scraping plate, and the other part returns to the feeding ditch. After several cycles, the purpose of dispersion can be achieved. However, using three roller machines or multi roller machines for treatment has low efficiency and high energy consumption, which can not meet the needs of mass production.

Ball milling dispersion

Through the mutual rolling and collision between the grinding balls and between the grinding balls and the cylinder block in the ball mill, the powder particles in contact with the steel ball are crushed or ground, and the mixture is evenly dispersed by highly turbulent mixing in the gap of the ball.

Sanding dispersion

Sanding is the extension of ball milling. Only the grinding medium is fine beads or sand. The sand mill can feed continuously. When the premixed slurry of nanopowder passes through the cylinder, it is violently impacted and sheared by the violently stirred sand particles in the cylinder, so that the nano oxide can be well dispersed in the coating. The dispersed slurry leaves the sand grinding area and passes through the outlet screen, which can block the sand particles and return them to the cylinder. Good dispersion effect and material fineness can be achieved through the ball mill and sand mill dispersion, but ball mill and sand mill can not avoid the shortcomings of low treatment efficiency and high energy consumption.

High shear disperser

The core component of the high shear disperser is the stator/rotor structure. The high tangential speed and the high-frequency mechanical effect produced by the high-speed rotation of the rotor bring strong kinetic energy so that the materials are subjected to strong mechanical shear, hydraulic shear, centrifugal extrusion, liquid layer friction, impact tear, and turbulence in the narrow gap between the stator and rotor, so that the immiscible solid phase, liquid phase, and gas phase under the conditions of the corresponding mature process, Instant questions are evenly and finely dispersed. After high-frequency cycling, stable high-quality products are finally obtained.

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