How to distinguish genuine high quality black masterbatch?
09/04/2018
Xinyang will provide you six ways to identify:
1, the dispersion is high
Black masterbatch is produced using carbon black. Raw
carbon black is dusty, light, and fluffy, and unless it is treated with
large-scale treatment, it will make the working environment dirty. Because of this, casters generally choose black masterbatch to complete the pre-dispersion of carbon black. This resin carrier is clean, free flowing and easy to use.
The difficulty of dispersing carbon black is also plaguing the producer of color masterbatches. 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. To
achieve a stable high dispersion, a high level shear mixer 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, the coverage is strong
The
second factor that determines the quality of the black masterbatch is
the coverage. The large-particle carbon black has poor coloring ability
and is not easy to cover all other colors in the lower layer. As a
result, the final product only gets 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
covering power.
3, liquidity is better
If
the 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. The masterbatch with the smallest dilution ratio produces a uniform, dispersive black.
4, the compatibility is greater
Compatibility is the fourth factor in determining the quality of black masterbatches. If the masterbatch is produced using chips or recycled materials, it may contain contaminants or other non-meltable polymers. 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.
5, the stability should be consistent
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. 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, the 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, a relatively small amount of small particle carbon black can be used.
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