How to improve the performance of polypropylene for non-woven fabrics
Release Time:
2022-05-06
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Ultra-high melt flow polypropylene (PP) can often be used to produce products such as meltblown nonwovens and polypropylene waxes. There are two main methods for producing ultra-high melt flow PP: one is to control the degradation of common PP raw materials; the other is to use direct polymerization for production. Controllable degradation methods are more used in actual production, including chemical degradation, thermal degradation, mechanical degradation and other methods.
The direct polymerization method is to control the relative molecular mass and distribution of PP through the polymerization process and catalyst, and accelerate the chain transfer reaction by means such as hydrogenation, so as to reduce the relative molecular mass of the polymer and increase the melt flow rate (MFR) of the PP raw material. .
At present, there are many related studies on controllable degradation methods, but few studies on the structure and properties of ultra-high melt flow PP produced by direct polymerization. The relative molecular mass distribution characteristics and melt crystallization properties of ultra-high melt flow PP produced by direct polymerization were studied below, and the influence of its structure on the spinning process was also discussed.
a) The relative molecular mass distribution of ultra-high-flow PP produced by direct polymerization method is wider than that produced by chemical degradation method, and its number-average relative molecular mass is much lower than that of PP produced by chemical degradation method when the MFR is similar.
b) The melting temperature of the PP samples produced by the direct polymerization method is lower, the crystallinity and crystallization temperature are higher than those of the PP produced by the chemical degradation method, and the crystallization performance is better, which needs to be considered in the spinning process.
c) The direct polymerization PP raw material has a certain influence on the preparation process of the melt-blown non-woven fabric. The fibers are cooled and shaped quickly, and the stiffness and strength of the melt-blown non-woven fabric are high, but the fiber diameter is relatively thick.
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