Polypropylene electret master batch with high dielectric constant and preparation method thereof

Abstract

The invention relates to a polypropylene electret master batch with a high dielectric constant and a preparation method thereof. The electret master batch comprises the following components in parts by mass: 45-100 parts of polypropylene; 5-70 parts of an electret agent; 1-5 parts of a compatilizer; 0.01-1 part of an antioxidant; and 1-10 parts of a dispersing agent. The preparation method comprises the following steps: (1) mixing the electret, the compatilizer, the antioxidant and the dispersant in a high-speed mixer in parts by mass to obtain a first mixture: (2) mixing the mixture and polypropylene in a high-speed mixer in parts by mass to obtain a second mixture; and (3) carrying out melt blending extrusion and granulation on the second mixture to obtain the polypropylene electret master batch with the high dielectric constant. Compared with the prior art, the electret master batch has the advantages that the dispersibility of the electret can be effectively improved, and the stable and lasting electret performance of the melt-blown cloth is ensured.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a high dielectric constant polypropylene electret masterbatch and a preparation method thereof. Background technique [0002] With the progress of human society and the development of industrialization, there are a large number of particles, bacteria and viruses floating in the ambient air where people gather, and these particles can stay in the air for a long time. Deep, 10-micron diameter particles typically deposit in the upper airways, and particles below 2 microns can penetrate deep into the bronchioles and alveoli. After fine particles enter the human body to the alveoli, they directly affect the ventilation function of the lungs, making the body prone to hypoxia, which can cause cardiovascular diseases, respiratory diseases and lung cancer. Bacteria and viruses can directly cause serious diseases in the human body. Therefore, in the face of such a severe air environment ...

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Problems solved by technology

[0004] Patent CN109354767A discloses a polypropylene electret masterbatch, by adding natural wax, rosin, plexiglass, fatty acid with 6-20 carbon atoms or its salt, N,N'-ethylene bisstearamide, ethylene One, two or more combinations of dioleic acid amide can achieve the purpose of electret, but the temperature resistance of the product made by this method is not good enough, and the time limit of electrostatic adsorption in humid environment is not long

[0005] Patent CN111484678A uses one or more of nano-tourmaline powder, nano-silica, and nano-polysilsesquioxane powder as electret; patent CN111732790A uses modified rosin, stearate, and ethylene bisstearate At least one of acid amide and tourmaline powder is used as electret agent; patent CN111471238A adopts adding tourmaline powder, aluminum hydroxide and graphene as electret agent; patent CN112011126A adopts adding nanoscale tourmaline powder and nanoscale fluorine-containing organic electret agent Any one or two mixtures of them are used as electret agent; patent CN111849074A uses at least one of nano-tourmaline, nano-fumed silicon dioxide or nano-organic fluoride as electret agent; patent CN111909455A uses the addition of tourmaline powder, Fluorine-containing polymers and oleophobic agents are used as electret agents, and the electret effect is very good, but the tourmaline powder itself has static electricity during processing, which is easy to agglomerate, difficult to disperse, and the electret efficiency decreases, especially spinning spinnability major problems, and even cause damage to the spinning equipment

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