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Masterbatch Quality Identification Method 1
- Sep 05, 2017 -

1. Dispersive high black masterbatch is produced using carbon black. Raw carbon black is very difficult to handle and dirty mixture, it is covered with dust, light weight, was fluffy. Unless a large-scale treatment, or it will dirty machines and workers, so that the working environment becomes dirty. Because of this, casting workers are generally selected in a resin carrier, that is, black masterbatch to complete the pre-dispersion of carbon black. The resin carrier is clean, free flowing and easy to use. In addition, carbon black in addition to dirty, there is a feature that is difficult to disperse. If the injection mold directly to the raw carbon black melting, coloring effect will be very poor. No scattered carbon black stripes and spotted areas are clearly visible by the less colored places. The standard injection molding machine can not effectively disperse raw carbon black. Carbon black is also difficult to disperse the performance also plagued the masterbatch manufacturers. The use of single or double screw extruder to produce high-load black masterbatch dispersion is very poor. When the end user mix or mold these black masterbatch, its performance is slightly better than carbon black, but the effect is equally unsatisfactory. In order to achieve a stable high degree of dispersion, it is necessary to mix a carbon black, such as a mixture of FCM or BANBURY, using a high standard shear machine. With sufficient strength, these mixers can mix the carbon black and the base resin completely together. The type of carbon black used also affects the dispersion. The smaller the carbon black particles, the harder the dispersion is.


The second factor in determining the quality of the black masterbatch is coverage. This factor is particularly important for masterbatches for waste or recycled polymers. In these cases, the role of black is Covering other colors in the waste. Large particles of carbon black coloring ability is poor, not easy to cover all the other in the lower color, the results of the final product only get away from the color. In the melting process, the right to first select the high coloring ability of carbon black to cover the ability of the existing color is the so-called coverage. Third, the liquidity is better to determine the quality of the black masterbatch

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Three factors are rheological and fluid. If a masterbatch itself has good dispersion, but it can not flow into the material to be molded, the production effect is not ideal. In general, the backing resin used to produce the masterbatch has a high rheology. In order to save costs, some masterbatch producers use reusable materials, scrap or recycled materials as resin carriers. The flowability of the masterbatch thus produced will be significantly reduced, and if the rheology is not good, the mold union will have trouble in the cycle time and appearance. It is noteworthy that, if the dispersion and rheology is not high, some end users will increase the dilution ratio to make up, but this approach will only increase the use of masterbatch costs. The masterbatch with the smallest dilution ratio can produce a uniform, good dispersion of black.