Nanometer calcium carbonate reinforced and toughened plastic master batch and preparation method thereof

Abstract

The invention discloses a nanometer calcium carbonate reinforced and toughened plastic master batch and a preparation method thereof. The master batch consists of nanometer calcium carbonate, micrometer calcium carbonate, metallocene polyethylene, carrier resins and aids, wherein the nanometer calcium carbonate and the micrometer calcium carbonate are blended and added, so that reinforcing and toughening functions of the master batch are enhanced; the metallocene polyethylene has high strength and toughness, so that reinforcing and toughening effects of the master batch can be simultaneously enhanced; and the master batch is prepared by two steps, so that the nanometer calcium carbonate passes through a co-rotating twin screw extruder for two times, the dispersibility of the nanometer calcium carbonate in the master batch is further enhanced, and the reinforcing and toughening functions is fully reflected. The master batch has the advantages that the nanometer calcium carbonate can be fully and uniformly dispersed in the carrier resins, so that the prepared master batch has the peculiar reinforcing and toughening functions of the nanometer calcium carbonate; and the master batch is simple in processing technology and low in cost, the stability, heat resistance and aging resistance of materials can be effectively enhanced, and particularly the plastic strength, the toughness and the surface smoothness are greatly improved.

Description

technical field [0001] The invention relates to the technical field of plastics, in particular to a nano calcium carbonate reinforced and toughened plastic masterbatch and a preparation method thereof. Background technique [0002] In the production process of plastics, in order to reduce production costs, calcium carbonate was directly added to plastics in the form of powder as a filler at the beginning, but it was later found that this had a significant effect on the performance of plastics. Later, in order to improve the performance of plastics, calcium carbonate powder was mixed with dispersing additives to make master batches and then added to plastics, which improved the problem of plastic performance degradation to a certain extent. In addition, the above-mentioned calcium carbonate powders are generally heavy, light and micron. Although the production cost is reduced, the improvement of plastic performance is not obvious enough. In recent years, the application tech...

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Problems solved by technology

However, this patent is only limited to the improvement of plastic toughness, and the improvement of strength is not obvious, and the calcium carbonate powder in the raw materials is all nano-scale, which virtually increases the production cost and the difficulty of preparation. High-grade calcium carbonate has a large specific surface area and high specific surface energy, and it is easy to agglomerate particles, form secondary particles, and even form larger agglomerated particles. Even if low molecular weight polystyrene with dispersing effect is added, it is still There will be some nano-calcium carbonates that are difficult to fully and evenly disperse in the carrier resin, and eventually the unique properties of nano-calcium carbonate cannot be fully exerted.

In addition, the preparation of the masterbatch in this patent adopts the conventional blending and one-time extrusion processing method, which limits the performance of the prepared masterbatch due to the limitation of the process

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