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Black PP or PE Masterbatch for Making Plastic Pipe

Jul 04, 2017

Extrusion grade 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, extrusion grade black masterbatch, Extrusion Grade 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 by the less colored place will be obvious next to the show. The standard plastic machine can not effectively disperse raw carbon black.

Carbon black is also difficult to disperse the performance also plagued the masterbatch producers. The use of single or Extrusion Grade Black Masterbatch double screw extruder to produce high-load extrusion grade black masterbatch has very poor dispersibility. When the end user mixes or molds these black masterbatches, their 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 the carbon black, such as a mixture of FCM & BANBURY, using a high standard shear machine. With sufficient strength, these mixers can mix the carbon black and the base resin completely together.

The third factor in determining the quality of the extruded black masterbatch is rheology and fluidity. 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, Extrusion Grade Black Masterbatch 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.

    Applications of black masterbatch:
    1. PE/PP Injection Molding (Box, Containers, Chairs, Crates, Buckets, Battery, cases, Hangers, etc.)
    2. PE/PP Extrusion Molding (Sheet, Pipe, Wire & Cable, etc.)
    3. PE Blow Molding (Medical & Cosmetic container, Lubricant & Paint container, etc)
    4. PE Film (shopping bags, casting film, multilayer film, etc.)
    5. PE Fiber (Carpet, Textiles, Upholstery, etc.)

    Q1. How to use masterbatch?
    A: just mix up with the resin granules according to the dosage ratio under appropriate temperature.
    Q2.  The difference between the general use and the special purpose masterbatches?
    1: Special purpose masterbatch: used as the same material as carrier. For example, PE products often use master batches based on PE.
    2: General use masterbatch: Use one resin as carrier, but also can be used for coloring other resins.
    In general, it's easy to use this masterbatch but there are some shortcomings:
    A. Poor predictability of the color. 
    The final color changes according to the change of resin.
    B. Affect other characters of plastic products.
    Especially the hardness of products for it's easy to be deformed and distorted, especially for engineering plastic
    C. Higher cost
    General use masterbatches often use pigments which have higher heat resistance grade and higher cost.
    Q3.  How long the masterbatch could be stored?
     A : If stored under a dry and cool environment, the quality of masterbatches will not change even after a long period of store, for the pigments fixed on the carrier resin which stay in a closed state. 
    Q4.  Does the masterbatch need to be dried before use?
    A : In general it can be used directly except ABS and some expecial masterbatches mentioned, which should be dried according to common method.
    Q5.  Does the masterbatches influence the property of products?
     A : Some pigments have effect on flame resistance. It should be mentioned as first if is used for flame resistance products. 
    Q6.  Does the mould have an effect on masterbatches?
     A : If ask for a smooth surface, Good quality mould is needed.
    Q7.  Do you accept Credit Card, Visa, Paypal,etc. payment?
     A : Payment terms is FOB SHANGHAI, LIANYUNGANG port, by TT (30% deposit), balance against the copy of B/L or L/C at sight. 
    Q8.  Will the color of masterbatches fade?
     A : Absolutely not. 
    Q9.  Besides coloring, does the masterbatches have flame resistant, brightening, anti-static, anti-oxidation , anti-ultraviolet functions?
     A : According to the application of products, like brightener, we could make it according to your requirements.