Film-grade polypropylene coloring master batch and preparation method thereof

Abstract

The invention discloses a film-grade polypropylene coloring master batch, which is prepared from the following main raw material components in percentage by mass: 28 to 43 percent of isotactic homo-polypropylene, 55 to 70 percent of inorganic pigment, 0.2 to 1.05 percent of dispersing agent and 0.5 to 1.8 percent of weather-resistant agent. The content of the coloring pigment in the formula system of the film-grade polypropylene coloring master batch is high, but the coloring pigment is well dispersed in the film-grade polypropylene coloring master batch, the coloring is uniform, and the color difference is low; the whiteness, the color difference value, the weather resistance and the moisture content of the film-grade polypropylene coloring master batch all meet the product standards of the film-grade polypropylene coloring master batch. The invention further discloses a preparation method of the film-grade polypropylene coloring master batch, continuous mixing and extrusion operation of a double-rotor continuous mixing mill is adopted, the technological process is simple, the production cost is low, and the preparation method is suitable for batch production.

Description

technical field [0001] The invention relates to the technical field of color masterbatch production, in particular to a film-grade polypropylene color masterbatch and a preparation method. Background technique [0002] Polypropylene is widely used in packaging, electronic appliances, medical supplies and other fields. It is a thermoplastic resin with a wide range of uses. Most of the food plastic packaging is polypropylene plastic products. In the existing production process, most of the masterbatches use twin-screw extruders. This preparation process is generally suitable for low-concentration pigment dispersion. When the pigment content in the masterbatch is higher than 50% and it is used for film coloring, it is easy to cause poor pigment dispersion. The light transmittance is unstable, and the color difference is not well controlled. [0003] Invention patent CN109265829A discloses a preparation method of PP color masterbatch, which uses random polypropylene as the carr...

AI Technical Summary

Problems solved by technology

In the existing production process, most of the masterbatches use twin-screw extruders. This preparation process is generally suitable for low-concentration pigment dispersion. When the pigment content in the masterbatch is higher than 50% and it is used for film coloring, it is easy to cause poor pigment dispersion. The light transmittance is unstable, and the color difference is not easy to control, etc.

[0003] Invention patent CN109265829A discloses a preparation method of PP color masterbatch, which uses random polypropylene as the carrier to crush it first, then adds a dispersant and stirs for 40-50 minutes, then adds pigments and continues to stir for 30-40 minutes, and finally It is extruded and granulated by a twin-screw extruder to obtain the finished PP masterbatch; the masterbatch prepared by this method has the advantages of uniform coloring and low color difference, but the process is complicated and the cost is high, so it is not suitable for mass production.

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