The quality of the black masterbatch is determined by the following factors:

Dispersion

Coverage

Rheology

compatibility

stability

Color shade

1. High dispersion

Black masterbatch is produced using carbon black. The difficult to dispersive properties of carbon black have been plaguing color masterbatch manufacturers. High-load black masterbatches produced using single or double screw extruders have very poor dispersion. When the end user mixes or molds these black masterbatch, its performance is only slightly better than carbon black, but the effect is equally unsatisfactory. In order to achieve a stable high degree of dispersion, a high level of shearing kneader must be used to mix carbon black, such as a mixture of FCM or BANBURY. With sufficient strength, these mixers allow the carbon black and base resin to be thoroughly mixed together. The type of carbon black used also affects the coloring dispersibility. The smaller the carbon black particles, the more difficult the dispersion is.

2. Strong coverage

The second factor determining the quality of the black masterbatch is the coverage. This factor is especially important for masterbatches used in scrap or recycled polymers. In these cases, the role of black is to cover the rest of the scrap. colour. The large-particle carbon black has a poor coloring ability and is not easy to cover all other colors in the lower layer, and as a result, the final product only obtains a deviation from the color. In the melting process, the ability to correctly select the carbon black with high coloring ability to cover the existing color is the so-called covering power.

3. Better liquidity 

The third factor determining the quality of the black masterbatch is rheology and fluidity. If a masterbatch itself has good dispersibility, but it cannot flow into the material to be molded, the production effect is not satisfactory. In general, primers used to produce masterbatches have higher rheology. In order to save costs, some masterbatch producers use recycled materials, scraps or recycled materials as resin carriers. The flow properties of the masterbatch thus produced will be significantly reduced, and if the rheology is not good, the mold union will have trouble with the cycle time and appearance treatment. It is worth noting that if the dispersion and rheology are not high, some end users will make up for it by increasing the dilution ratio, but this will only increase the cost of using the masterbatch. The masterbatch with the smallest dilution ratio produces a uniform, dispersive black.

4. The compatibility is greater

The size of the compatibility is the fourth factor determining the quality of the black masterbatch. If the masterbatch is produced using chips or recycled materials, it may contain contaminants or other non-meltable polymers. This can cause some unpredictable and difficult constraints, wasting the time and raw materials of the final consumer. At this time, the base resin can be used to produce high quality masterbatch, and the masterbatch has good compatibility during the melting process. Premium masterbatches can be produced using LLDPE, LDPE, HDPE, PP, PS, SAN, PA, and other materials. Special polymer masterbatches are available if engineering grades and stringent physical properties have been noted. Several internationally large masterbatches producers are conducting research to produce so-called "global universal" masterbatches. These masterbatches are widely compatible with other raw materials, have good rheology, and are flexible for application.

5. The stability should be consistent

In today's international economy, international customers are absolutely necessary for the quality of masterbatch and the stability of raw materials, which is the fifth factor determining the quality of black masterbatch. One of the main manifestations of stability is the smooth carbon black ratio. If the percentage of carbon black is fluctuating, the amount of masterbatch to be melted is not the same, and it is impossible to produce a product of the same hue. Some final producers report that during the production process, the required dilution ratio is usually 5-8%, which is obviously unacceptable. Of course, other factors such as the fluidity and dispersion of the injected melt should be consistent with the amount of charge per batch.

6. Tthe brightness should be clearly defined

The final factor in determining the quality of the black masterbatch is the shade of the color. There are various carbon black types available on the market for the coloration of masterbatch, but the color and price of each type are also very different. Large particle carbon black has a lower degree of coloration and a different background color than small particle carbon black. Large-grain masterbatches are suitable for use in film production such as garbage bags, but are not suitable for the production of products that are aesthetically pleasing, such as television signage or where UV protection is required, such as agricultural film or external piping. For these products, only the use of high-priced small particle carbon black is used. In addition, low transparency is also a characteristic of small particle carbon black.