The quality of the black masterbatch is determined by the following factors: dispersion, coverage, rheology, compatibility, stability, color shade, and dispersion. Kedali Porcelain Industrial Co., Ltd. , http://www.gd-ceramic.com
Black masterbatch is produced using carbon black. Carbon black is a very difficult and dirty mixture that is dusty, light, and fluffy. Unless large-scale treatments are used, it can foul machines and workers and make the work environment dirty. Because of this, the casters generally choose to complete the pre-dispersion of carbon black on a resin carrier, that is, a black masterbatch. This resin carrier is clean, free flowing and easy to use. In addition, in addition to the dirty carbon black, there is another characteristic that it is difficult to disperse. If the carbon black is directly melted during injection molding, the coloring effect will be very poor. Carbon black streaks and spotted areas without dispersion will appear clearly alongside the less colored areas. Standard injection molding machines do not effectively disperse carbon black. The difficult-to-dispersive properties of carbon black also plague color masterbatch producers. 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 consistently 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. The application of the film is most demanding for dispersion. The final product of the masterbatch with poor dispersion can be easily seen by the naked eye from the corners. In addition to the lack of aesthetics, the poor dispersion of carbon black in the film significantly reduces the weathering resistance of the black film. Small particles with good dispersion are a major feature of the fiber industry and are used in ropes, yarns, carpets and other industries. Large machines produce 30,000 strands of fine fiber at a rate of more than 5,000 meters per minute. If the dispersion of the masterbatch is too poor, the fiber will be broken, resulting in production downtime.