Colored reinforced polypropylene composite material as well as preparation method and application thereof

Abstract

The invention discloses a coloring reinforced polypropylene composite material as well as a preparation method and application thereof, and relates to the technical field of polypropylene composite materials. The coloring reinforced polypropylene composite material is prepared from the following components in parts by weight: 55 to 70 parts of polypropylene resin, 15 to 35 parts of glass fiber, 1 to 10 parts of compatilizer, 1 to 8 parts of nucleating agent, 0.005 to 0.04 part of hyperbranched polymer, 0.5 to 4 parts of polyethylene resin, 1 to 5 parts of coloring agent and 0.2 to 1.5 parts of auxiliary agent, the coloring agent comprises titanium dioxide. The hyperbranched polymer and the polyethylene resin are added, so that the destructive effect of the coloring agent titanium dioxide on the glass fiber structure is reduced, the coloring effect of the titanium dioxide is reserved, and meanwhile, the adverse effect on the mechanical property of the polypropylene composite material is avoided.

Description

technical field [0001] The invention relates to the technical field of polypropylene, in particular to a colored reinforced polypropylene composite material and its preparation method and application. Background technique [0002] Polypropylene (PP) material itself has the advantages of non-toxicity, low odor, low cost, chemical corrosion resistance, etc., and has a very wide range of applications in the fields of home appliances, sanitary ware, and electronics. However, the strength of polypropylene material itself is not high, its mechanical properties are relatively poor, and its application range is limited. Adding glass fiber to polypropylene material to enhance its strength and other mechanical properties has become an effective way to improve the strength of materials. . This has become the consensus of the industry, and it is also the best technical route to realize the engineering of general-purpose plastics, the functionalization of engineering plastics, and the p...

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Problems solved by technology

[0003] Glass fiber can improve the strength performance of the material, but at the same time, it is easily affected by other substances during the modification process, resulting in a decrease in the mechanical properties of the final product. Chinese patent CN 104387663A is a preparation method of long glass fiber polypropylene composite material and In its application, a certain amount of colorant is added, and its main component is carbon black. The production process of carbon black is not mentioned in the patent, and the influence of carbon black on the performance of composite materials is not analyzed.

Chinese patent CN 110511488 A is a white low-temperature impact-resistant glass fiber reinforced polypropylene material and its preparation method. It is mentioned in the patent that it is usually possible to add toner to the polypropylene matrix. Because different toners have different strengths, they will In the production process, it has a certain influence on the structure of the reinforcing fiber, so the patent uses antimony powder to replace titanium dioxide in the aspect of product whitening, but this patent does not take into account the difference in whiteness between antimony powder and titanium dioxide. Antimony powder itself is Silver white or gray metal powder, its whiteness is not as good as titanium dioxide, although it has little influence on the mechanical properties of materials in the product, but the whiteness of the product cannot meet the general customer's demand for white products

[0004] The addition of colorants in reinforced products requires higher requirements. The main reason is that the Mohs hardness of most colorants is higher than that of glass fibers. In the composite system, the introduction of colorants will cause glass fibers to Its structure will be destroyed by high hardness colorants, resulting in a decrease in strength. Under normal conditions, zinc sulfide is added to increase the whiteness of the material, but the anti-yellowing effect of zinc sulfide is poor, and it is easy to change color under certain conditions. The introduction of titanium dioxide It will also lead to a decrease in the mechanical properties of the reinforced material. For example, when titanium dioxide is introduced into the glass fiber reinforced polypropylene system, compared with the natural color system without toner, the tensile strength, bending strength and impact strength of the white system will be significantly reduced.

The reason is that during the processing, the glass fiber will be broken due to the shear force generated by the screw. The shorter the retained length after breaking, the worse the effect of strengthening and toughening.

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