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The Four Factors That Determine The Quality Of Black Masterbatch
Apr 23, 2018

High dispersion

Black masterbatch is produced using carbon black. Raw carbon black is a very difficult and dirty mixture that is dusty, lightweight and fluffy. Unless large-scale treatment measures are used, it will foul machines and workers and make the working environment dirty. Because of this, casters generally choose to finish carbon black predispersion on a resin carrier, that is, black masterbatch. This resin carrier is clean, free flowing and easy to use. In addition, apart from being dirty, carbon black also has a characteristic that it is difficult to perform dispersion. If the raw carbon black is melted directly during injection molding, the coloring effect will be very poor. The carbon black stripes and spots that have no dispersion will clearly show up next to the less colored areas. Standard injection molding machines cannot disperse carbon black effectively.

Carbon black, which is difficult to disperse, also confuses pigmented masterbatch producers. The high load black masterbatch produced using single or double screw extruders has very poor dispersibility. When the end user mixes or molds these black masterbatches, 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 shearing mixer must be used to mix carbon black, such as a mixture of FCM or BANBURY. With sufficient strength, these mixers can completely mix carbon black and base resin together. The type of carbon black used also affects the dispersibility. The smaller the carbon black particles, the harder the dispersion is.

The application of thin wax is the most demanding of the dispersion requirements. The final product of poorly dispersed masterbatch can be easily seen by the naked eye from the corners. In addition to the lack of beauty, the poor dispersion of carbon black in the film significantly reduced the weathering resistance of the black film.

Strong coverage

The second factor that determines the quality of the black masterbatch is coverage. This factor is especially important for masterbatches used in scrap or recycled polymers. In these cases, the role of black is to cover other colors in the scrap. . Large-particle carbon blacks have poor coloring capabilities and do not easily cover all other underlying colors. As a result, the final product only gets off-color. In the melting process, the ability to properly select the carbon black with high coloring ability to cover the existing color is the so-called covering power.


  • Contact Us

    Add:No.127 Yanzaohang Village, Xuyuanzi Township,Qingyun County,Dezhou city,Shandong Province

    Fax:+86-531-88257710

    Mob:+8618053491991

    Email:twinklesheng@gmail.com

    Web:www.masterbatch-ls.com

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