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How to improve the performance of polypropylene for meltblown non-woven fabrics
Time:
2021-02-06
Ultra-high melt flow polypropylene (PP) can often be used to produce products such as meltblown non-woven fabrics and polypropylene waxes. There are two main methods for producing ultra-high melt flow PP: one is the controlled degradation of ordinary PP raw materials; The other is to use the direct polymerization method for production. Controllable degradation methods are more used in actual production, including chemical degradation, thermal degradation, mechanical degradation and other methods.
Ultra-high melt flow polypropylene (PP) can often be used to produce products such as meltblown non-woven fabrics and polypropylene waxes. There are two main methods for producing ultra-high melt flow PP: one is the controlled degradation of ordinary PP raw materials; The other is to use the direct polymerization method 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 regulate the relative molecular weight and distribution of PP through polymerization process and catalyst, accelerate the chain transfer reaction by hydrogenation and other means, reduce the relative molecular weight of the polymer, and improve the melt flow rate (MFR) of PP raw materials.
At present, there are many studies on controllable degradation methods, but there are few studies on the structure and properties of ultra-high melt flow PP produced by direct polymerization. The relative molecular weight distribution characteristics and melt crystallization properties of ultra-high melt flow PP produced by direct polymerization are studied below, and the influence of its structure on the spinning process is discussed.
a) The relative molecular weight distribution of ultra-high flow PP produced by direct polymerization is wider than that produced by chemical degradation, and the number of relative molecular masses is much lower than that produced by chemical degradation when the MFR is similar.
b) The PP sample produced by direct polymerization method has a lower melting temperature, and the crystallinity and crystallization temperature are higher than that produced by chemical degradation, and the crystallization performance is better, which needs to be considered in the spinning process.
c) The PP raw material by direct polymerization method has a certain influence on the preparation process of meltblown non-woven fabric, the fiber cooling and shaping are faster, the hard stiffness and strength of the meltblown non-woven fabric are high, but the fiber diameter is coarse.
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