The materials that make up the black masterbatch are: A. carbon black; B. carbon black carrier; C. carbon black wetting agent; D. carbon black dispersant; E. other processing aids.
According to international classification, China has more than 30 varieties, mainly divided into two categories: rubber and non-rubber.
Among the carbon blacks for rubber, it is mainly wear-resistant carbon black, which can effectively improve the wear resistance of rubber tires; among non-rubber carbon blacks, there are only a few kinds of carbon blacks that can really be used as black masterbatches.
The channel carbon black is the most widely used in plastics, mainly due to its rich source, high purity and small particle size. Among them, it is divided into high-pigment carbon black (particle size 9-17mm), medium-pigment carbon black (particle size 18-25mm) and low-pigment carbon black (particle size 26-37mm).
Due to the different varieties of carbon black, the price varies greatly. Due to its multi-activity, carbon black particles rarely exist as primary particles, and almost all exist as agglomerated particles with a certain range of particle sizes.
The carrier is the substance that carries the carbon black. Generally, what raw materials are used in plastic products, and what raw materials are used in the carrier. The black masterbatch produced in this way has good compatibility with plastic raw materials.
Such as: PS (polystyrene) plastic products, the black masterbatch carrier used is PS. For polyethylene plastic products, the carrier is polyethylene. However, LDPE (high pressure polyethylene) is generally used because LDPE has the strongest carbon black bearing capacity and good processability.
While other polyethylene HDPE and LLDPE can only produce low concentration black masterbatch. For PP (polypropylene) plastic products, only black masterbatches with PP and LDPE as carriers can be used, but black masterbatches with HDPE, LLDPE and other plastics as carriers cannot be used, mainly considering the compatibility of PP with HDPE and LLDPE The sex is even worse, which will cause PP to become brittle. Of course, there are also black masterbatches with recycled materials as carriers.
EVA is generally chosen for general-purpose carriers, and other vinyl elastomers are chosen for more advanced carriers with less odor.
The specific gravity of carbon black is about 2g/cm3. Due to the small particle size of carbon black, the apparent density is very small, which is fluffy and light. For smooth processing, the carbon black must first be wetted. The choice of wetting agent is critical.
In order to reduce costs, there are not a few companies that use a lot of products such as white oil or paraffin, which will seriously affect the strength of the processed products.
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