Masterbatch in the end the impact on polypropylene spinning!

PP masterbatch coloring that is spinning and masterbatch polypropylene slices mixed with a certain proportion of added-screw extruder spinning, or separately from the two screws into the mixer after melt spinning directly obtain colored fibers. With this method of production of colored fibers have bright colors, soft gloss, do not fade, pollution-free advantages. However, due to the heating process is longer, the spinning temperature is high, easily lead to thermal degradation, so that part of the masterbatch pigment produce decomposition, influence the coloring effect of the fiber. And even discoloration.

Here we take a look at the masterbatch has revealed what impact polypropylene spinning?

Molecular weight polypropylene slices are generally between 15 to 250,000, in polypropylene spinning process. Higher melt viscosity, poor flow properties. After the addition of 1% to 3% of masterbatch in polypropylene masterbatch when coloring spinning, changing the melt flow properties of polypropylene, polypropylene spinnability, drawability, etc. and not added when the masterbatch spinning different (see Table 1).

Table 1 shows that, when spun yellow fibers having respective heating zone temperature than the melt spinning masterbatch not added low temperature of about 30 ℃, indicating azo-based yellow pigment compatibility with the polypropylene resin is preferably ʱ?? Viscosity and flow properties are superior compatibility after not add masterbatch polypropylene melt, so when the spinning temperature may be lower.

When adding black masterbatch spinning, melt temperature higher than the masterbatch not add around 5 ℃. This indicates black masterbatch and polypropylene poor compatibility, viscosity, melt flow properties deteriorate, so that only by increasing the spinning temperature to reduce the melt viscosity and improve the rheological properties of the melt, so that the color of the particles It can be more uniformly dispersed in the melt, in order to ensure the production of qualified colored fiber, if not increase the melt temperature, the viscous flow of melt, spinning can be led by Chung deteriorated. Breakage rate increase, wrapped roll is serious, increase the unevenness of the fibers.

As can be seen from Table 1, was added after phthalocyanine blue masterbatch. Slightly below the melt temperature of the melt temperature not add masterbatch, which shows phthalocyanine class masterbatch and polypropylene resin compatibility is better able to reduce the viscosity of the melt. Increase the melt flow properties, so that spinnability is improved.

When mechanized spinning polypropylene additive masterbatches, join different materials affect the structure and composition of the masterbatch spinning great flow properties. Azo-based, phthalocyanine pigment masterbatch etc. can improve the flow properties of polypropylene melt and reduce the spinning temperature. Black pigment masterbatch polypropylene melt flow properties make worse, spinning temperature can be increased to improve the flow properties of the melt, we in the production practice, polypropylene colored masterbatch spinning or spinning, usually Join a molecular weight regulator (DTBP cooling Masterbatch) about 3%, so that the screw districts spinning temperature reduced about 40 ~ 60 ℃. Melt temperature as controlled between 255 ~ 280 "C, so production is better.