Preparation method of melt-blown polypropylene composite material with ultrahigh melt index

The invention belongs to the technical field of high polymer materials, and particularly relates to a melt-blown polypropylene composite material with an ultrahigh melt index and a preparation method thereof. The preparation method of the melt-blown polypropylene composite material with the ultrahigh melt index comprises the following steps of (1) uniformly mixing polypropylene resin, a sorbitol nucleating agent, a lubricant and an antioxidant through a high-speed stirring mixer to form a mixture, and putting the mixture into a double-screw extruder; and (2) injecting a liquid organic peroxide initiator into a double-screw extruder from a specific position of an extruder barrel through a precision metering pump, and carrying out high-temperature melting and screw shearing, vacuum drying, filtering, extruding, cooling and pelletizing, screening and collecting to obtain the melt-blown polypropylene composite material with the ultrahigh melt index. According to the preparation method, temperature parameters and