What kind of stage is the dispersion process of plastic masterbatch?

The dispersibility of plastic masterbatch means that the pigment is dispersed into the desired particle fineness in the plastic, and is uniformly mixed in plastic, and the complete pigment dispersion process usually contains three indispensable stages.

1 Wetting pigment and air or water to become a pigment and a carrier interface.

2 Dispersion pigment particles break down the particle agglomeration and aggregate under external active force.

3 Stable stability has been dispersed from pigment particles in the medium, and effectively prevents again aggregation.

Which steps are depends on the plastic masterbatch?

An important step in pigment dispersion is the wetting of pigment particles, which is divided into initial wetting of pigments and continuous wetting of particles in the dispersion process. For plastic processing, the initial moisture is the process of replacing the air and moisture on the surface of the resin cargo, and the purpose of the pigment wetting is to reduce the cohesiveness between the pigment particles, if the surface of the pigment cannot be fully contained The body (also comprising a wetting agent) is wetted, then the decentralized equipment produces the shear stress produced by the melt medium to the pigment agglomeration. The pigment wetting is difficult to determine from the surface properties of the pigment particles and the nature of the colored color. The smaller the contact angle of the pigment and the colored color, the smaller the surface tension of the colored color, the easier the wetting.

The second step of the pigment dispersion is the refinement of the pigment particles. After the pigment particles are wetted, the pigment microtalation is completed under external force, and the pigment is finely refined to achieve the desired particle size. At present, the external force of mechanical dispersion is nothing more than pressure, impact strength and shear force, and is used to pulverize the pigment to agglomeration and aggregates.

The third step of the pigment dispersion is to be stabilized by the dispersed pigment fine particles, and the surface area of the pigment particles after the refinement will increase the rejection phenomenon, and the refined pigment particles will be further surface treatment, and the new formation interface is lowered. Surface energy so as to further aggregate the fine pigment particles after further processing.

The pigment dispersion processes described above are: wetting, refinement, and refined stability, etc., in practice, dense and almost simultaneously, just to facilitate discussions to discuss them separately.

The initial wetting of the pigment has an irreplaceable significance for the dispersion of plastic masterbatch, and usually this process is done via some seemingly simple steps, so it is very easy to neglect. However, the initial wetting is not only the wetting of the surface of the pigment particles, but the dispersion of the pigment particles is just the beginning of this step, the initial wet is not good, the good dispersion of the pigment particles is not talking about, the reason is YES: The colored resin must be sufficiently capillary permeation in the microcarcentricity in the pigment particle aggregate, due to capillary permeation, the cohesive strength between the pigment particles is lowered, and it is easily subjected to pulverization in the action of shear. Therefore, the wetting rate of the pigment and the degree of capillary permeation are determined for the total dispersed rate and quality of the pigment particles.

Countless practices have proven that the causes of most pigment particles are derived from the unsatisfactory initial wet, and when such a situation occurs, it is difficult to reach the ideal effect, at this time, Only the wetting of the pigment particles is re-made, and the problem of dispersion can be solved. Without the use of ordinary wetting agents, the same pigment is not intended to be exhausted by the extrusion of the granulation or six times, and the dispersibility of the ultimately reflected is not satisfactory; Processing, the result will produce a quality leap.