Method for preparing high-fluidity carbon black master batch by in-situ degradation of polypropylene with peroxide

Abstract

The invention discloses a method for preparing a high-fluidity carbon black master batch by in-situ degradation of polypropylene with peroxide. The prepared high-fluidity color master batch still hasa high melt flow rate when the mass content of carbon black in the high-fluidity color master batch reaches up to 50-60%, and is easy to disperse in a low-viscosity polypropylene melt. The productionrequirements of special products such as polypropylene melt-blown cloth and fibers are particularly met. The method comprises the following steps: uniformly mixing polypropylene resin and organic peroxide in formula raw materials in a high-speed mixer; continuously and directly putting the mixture of polypropylene resin, organic peroxide and high-structure-degree carbon black into a double-rotor continuous mixing mill for blending; selecting a single-screw extruder with a high length-diameter ratio, and adding a high-fluidity PP / carbon black mixture and an antioxidant into a hopper of a single-screw extruder; adding a mixed solution of liquid paraffin oil and liquid ethylene propylene rubber into the middle section of the single-screw extruder, and further uniformly mixing; and finally, granulating to obtain the high-fluidity carbon black master batch.

Description

technical field [0001] The present invention relates to a kind of carbon black masterbatch and preparation method thereof, more specifically relate to a kind of peroxide in situ degradation polypropylene and prepare the method for high fluidity carbon black masterbatch. Background technique [0002] Among the protective masks, the "flat mask" with three-layer non-woven structure is the most common. The core technical component of this mask is the middle core layer-the filter layer, which is a special structure of melt-blown cloth. This kind of melt-blown fabric mainly uses polypropylene with high melt flow rate (MFR) as the main raw material to prepare non-woven fabrics with fiber diameters of 1-5 μm. This non-woven fabric with a special structure has many voids, fluffy structure, It has the characteristics of good anti-wrinkle ability, and at the same time, the microfiber with unique capillary structure increases the number and surface area of ​​fibers per unit area, so tha...

AI Technical Summary

Problems solved by technology

However, this method also has certain shortcomings. For example, the melt extrusion-degradation method is first used to prepare the matrix resin with a melt flow rate of 1500-2000g / 10min. The granular resin obtained by this production process is not suitable for blending with carbon black to directly prepare color Masterbatch, but powdered resin needs to be made through a special mill before it can be used to prepare carbon black masterbatch

The preparation process is relatively complicated, and there are still disadvantages such as large energy consumption and high production cost

[0007] To sum up, in the process of preparing special masterbatches for non-woven fabrics and melt-blown fabrics, the products prepared by the existing technology have certain limitations, mainly color masterbatches, especially high carbon black content masterbatches The melt flow rate is low, it is difficult to disperse in the matrix resin (MFR=1500~2000g / 10min) for melt blown cloth, or there are disadvantages such as relatively complicated preparation process, large energy consumption and high production cost

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