High-blackness polypropylene composition and preparation method thereof

Abstract

The invention relates to the technical field of preparation of polypropylene and especially relates to a high-blackness polypropylene composition and a preparation method thereof. The high-blackness polypropylene composition is composed of following components, by weight, 55-99 parts of polypropylene resin, 0-40 parts of inorganic filling materials, 0.2-1.3 parts of crosslinked polymethyl methacrylate microspheres, 0.3-3 parts of nano carbon black and 0.4-1.5 parts of other additives. The preparation method includes the steps of feeding the polypropylene resin, the crosslinked polymethyl methacrylate microspheres and the nano carbon black into a high-speed stirrer, stirring the materials uniformly, adding other additives and filling materials, stirring the materials uniformly, and performing extrusion pelletization, melt extrusion and granulation to the uniformly-mixed materials through a double-screw extruder to prepare the high-blackness polypropylene composition. The composition is high in blackness and low in cost.

Description

technical field [0001] The invention relates to the technical field of polypropylene preparation, in particular to a high blackness polypropylene composition and a preparation method thereof. Background technique [0002] Polypropylene (PP) has the advantages of low density, flex resistance, chemical corrosion resistance, and good insulation. It is used in a large amount in general-purpose plastics, and its use is constantly being expanded. However, PP has a large shrinkage rate, and its molding shrinkage rate is usually between 1.0 and 2.5%, which severely limits its application in products with high size requirements and good appearance effects. At present, the way to reduce the molding shrinkage of PP materials is mainly realized by filling inorganic powders for melt blending modification. The filled and modified PP materials can be widely used in daily household appliances such as microwave ovens, electric water heaters, hair dryers, and rice cookers. middle. The fille...

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Problems solved by technology

[0008] The methods adopted in the above patents have improved the dispersion of carbon black to a certain extent, but the process of manufacturing color masterbatch is complicated. It must first be pre-mixed with a banbury mixer, and then the mixture after banbury mixing is crushed and granulated by an extruder. Carbon black masterbatches, the method of manufacturing carbon black masterbatches can lead to increased production costs

[0009] Chinese patent CN200910198363 uses white mineral oil as a dispersing aid, and the particle size of carbon black used is between 13 and 70 microns. After the two are pre-dispersed, they are mixed with PP matrix, other fillers, and additives, and then extruded to granulate. This method avoids the complex processing of the masterbatch method, and improves the dispersion of carbon black to a certain extent, but due to the weak physical adsorption between white mineral oil and the surface of carbon black particles, it is difficult to overcome the agglomeration of carbon black particles, especially small The agglomeration of carbon black with particle size has a limited effect, so it also limits the improvement of the blackness of the material

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