Mineral/ whisker reinforced polypropylene composition

Abstract

The mineral/whisker reinforced polypropylene composition consists of polypropylene, mineral reinforcer, toughening agglomarate, PP grafting compatilizer, antioxidant and other assistant and features the addition of /whisker reinforcer. The compounding process includes high speed mixing of the materials except the whisker reinforcer; adding magnesium salt whisker reinforcer and mixing at low temperature; and pelletizing in a special double-screw extruder at 170-240 deg.c and 180-600 rpm. The polypropylene composition has high strength, high rigidity, high impact resistance, high size stability and other features, and may be used in producing parts of automobile, air conditioner, washing machine, etc.

Description

technical field [0001] The invention relates to a mineral / whisker reinforced polypropylene composition, which can be used for vehicle parts, home appliance parts, etc., and belongs to the technical field of polypropylene. Background technique [0002] As a general-purpose plastic, polypropylene has the characteristics of excellent processing performance, good mechanical properties, and chemical corrosion resistance. It occupies an important position in plastics, but its strength, stiffness, and heat resistance are far from satisfactory when making engineering components. At the same time, polypropylene has poor impact properties, especially poor low-temperature impact properties, large molding shrinkage, especially the uneven aspect ratio shrinkage when fiber is reinforced, which limits the application of polypropylene in engineering components. [0003] European patent EP-A496625 discloses a composite material of high crystalline polypropylene, which achieves the purpose of...

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Problems solved by technology

[0002] As a general-purpose plastic, polypropylene has the characteristics of excellent processing performance, good mechanical properties, and chemical corrosion resistance. It occupies an important position in plastics, but its strength, stiffness, and heat resistance are far from satisfactory when making engineering components. At the same time, polypropylene has poor impact properties, especially poor low-temperature impact properties, large molding shrinkage, especially the disadvantages of uneven aspect ratio shrinkage when fiber is reinforced, which limits the application of polypropylene in engineering components

[0003] European patent EP-A496625 discloses a composite material of high crystalline polypropylene, which achieves the purpose of high stiffness by adding 30% talcum powder, but this leads to a decrease in the impact strength of the material, thereby limiting the application of the material, while the Japanese patent JP Zhao 56-149318 and Japanese patent JP Zhao 61-256920, JP flat 4-36092 have introduced the method for preparing magnesium salt whisker, and Chinese patent CN1288860A discloses a kind of preparation method of novel magnesium salt whisker, to it in polymer substances, especially in polypropylene applications are not involved

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