How to choose black masterbatch?
07/18/2018
1.
The black masterbatch is made of resin and high pigment carbon black.
The carbon black concentration reaches 40%, the blackness brightness is
also high, the temperature resistance is very good, the color
masterbatch and the resin have good fusion degree, and the surface of
the product will not be layered. In
order to achieve a stable dispersibility of the color black
masterbatch, a high level of shearing kneader must be used to mix the
carbon black. With sufficient strength, these mixers can completely mix
the carbon black and the base resin. The
type of carbon black used also affects the coloring dispersibility, and
the smaller the carbon black particles, the more difficult the
dispersion. For
example, in addition to the lack of aesthetics, the carbon black with
poor dispersion in the film significantly reduces the weathering
resistance of the black film. If the dispersion of the masterbatch is too poor, the fiber will be broken, resulting in production downtime.
2, There are a variety of carbon black
on the market can be used for the coloration of masterbatch, the price
of different color brightness is also very different, the carbon black
of different sizes has different background color and the degree of coloration, the large particle carbon black is relatively low. For
example, large particle carbon black is suitable for the production of
garbage bag film, and small particle carbon black is suitable for use in
televisions, computers, mobile phone casings, and external pipes. In addition, low transparency is also a major feature of small particle carbon black.
3. One of the main manifestations of black masterbatch 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.
4.
If the black masterbatch contains contaminants or other non-meltable
polymers, it will lead to some unpredictable and difficult to constrain
the trouble, and ultimately waste the time and raw materials of the
consumers. However, the base resin can be used to produce high quality
masterbatch, and the masterbatch has good compatibility during the
melting process.
5, The black masterbatch can not flow into the material to be molded even
if it has good dispersion, the production effect will not be ideal. If the rheology is not good, the mold union encounters troubles in cycle time and appearance processing. If the dispersion and rheology are not high, some end users will make
up for it by increasing the dilution ratio, but this will only increase
the cost of using the masterbatch.
6. Black Masterbatch Coverage. This factor is especially important for masterbatches used in scrap or recycled polymers. Black
is to cover other colors in the scrap. The large-particle carbon black
has poor coloring ability, and it is difficult to cover all other colors
in the lower layer. As a result, the final product only obtains a
deviation from the color. In
the melting process, the ability to properly select carbon black with
high tinting ability to cover existing colors is the so-called covering
power.
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