Impact-resistant high-transparency polypropylene composition and its preparation method

Abstract

The present invention belongs to the technical field of modified polypropylene materials, and particularly relates to an anti-impact high-transparency polypropylene composition and a preparation method thereof, wherein the anti-impact high-transparency polypropylene composition is prepared from the following raw materials by mass: 100 parts of a polypropylene resin, 6-15 parts of a polyolefin elastomer, 12-38 parts of metallocene linear low-density polyethylene, 0.06-0.46 part of a weather-resistant aid, and 0.002-0.015 part of a colorant. According to the present invention, the coloring anti-impact high-transparency polypropylene composition obtained through polypropylene modification has advantages of high transparency, high fluidity, high impact resistance and low cost. In addition, the preparation method is simple, is easy to perform, and is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of polypropylene modified materials, and in particular relates to an impact-resistant high-transparency polypropylene composition and a preparation method thereof. Background technique [0002] Transparent polypropylene has the characteristics of excellent performance, safety and hygiene, and easy recycling. It has been widely used in thermoforming, crisper, medical equipment, household products, general industry and other fields. At present, most of the domestic market is ordinary transparent polypropylene with medium and low melting index. When injection molding large thin-walled high-transparency products, there are often problems such as insufficient injection, low transparency, and poor impact resistance. Usually, the processing fluidity of the product is improved by adding peroxide degradation, which often leads to unstable product quality, easy yellow appearance of the product, and high content of vol...

AI Technical Summary

Problems solved by technology

At present, most of the domestic market is ordinary transparent polypropylene with medium and low melting index. When injection molding large thin-walled high-transparency products, there are often problems such as insufficient injection, low transparency, and poor impact resistance. Usually, the processing fluidity of the product is improved by adding peroxide degradation, which often leads to unstable product quality, easy yellow appearance of the product, and high content of volatile components in the product; some products have low-temperature impact resistance or drop resistance. Poor, that is to say, the material is brittle and cannot meet the requirements of low-temperature applications. Usually, ordinary elastomers are added to improve impact toughness, but due to improper selection of elastomers, it will seriously affect the transparency and mechanical properties of the product; coloring Improper use of coloring masterbatch in the product will cause the content of heavy metals such as lead, mercury, hexavalent chromium and cadmium in the product to exceed the standard, and at the same time greatly affect the transparency and impact of the product

[0003] Chinese patent CN 102399395A "Preparation method of random copolymerized transparent polypropylene resin with high fluidity and high ethylene content", introduces to obtain the final product melt by adding antioxidant, neutralizing agent, nucleating agent and rheological masterbatch For transparent polypropylene products with a flow rate of 16-18g / 10min, the melt mass flow rate of this product is not high, and the products obtained by rheological masterbatch (ie, peroxide degradation method) tend to have unstable fluidity and quality, and the product The appearance is easy to turn yellow, and the content of volatile organic compounds (VOC) in the product is high, etc.

[0004] Chinese Patent CN 1443801A "A Transparent Polypropylene Composition" describes a transparent polypropylene composition obtained by adding a transparent agent and anthraquinone type disperse dyes, but the haze value of the material is higher than 28%, that is, the transparency is too poor , it is difficult to meet the requirements of high transparency

[0005] Chinese patent CN 101759929B "a high transparency and high flow toughened polypropylene material and its preparation method" introduces the addition of ethylene octene copolymer, metallocene m-LLPE, compatibilizer, SEBS, White oil and antioxidant, etc., to obtain a transparent polypropylene composition, the melt mass flow rate of the composition is not high, only 18 ~ 23g / 10min, more modified components added, the transparency of the material Greater impact

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