Polypropylene resin composition for hot channel injecting formation and production thereof

Abstract

A polypropylene resin composition for thermal runner injecting forming and its production are disclosed. The composition consists of polypropylene homopolymer 90-98 proportions, ternary rubber 1-5 proportions, super-thin butadiene styrene powdery rubber, nucleating agent 0.1-1 proportion, main antioxygen 0.1-0.25 proportion, assistant antioxygen 0.2-0.5 proportion, and rheological property improver 0.1-0.2. The production is carried out by mixing the matters for 3-5mins at normal temperature, adding into parallel double-screw extruder by feeder, and mixing and granulating. Its advantages include higher impact roughness, stretching intensity and rigidity.

Description

Technical field: [0001] The invention relates to the technical field of hot runner injection molding, in particular to a polypropylene resin composition for hot runner injection molding and a preparation method thereof. Background technique: [0002] With the development of the domestic home appliance industry and the increasing emphasis on environmental protection in the world, major refrigerator manufacturers have launched high-end air-cooled refrigerators that are competitive in the market and in line with international development trends. At the same time, the performance of polypropylene modified materials is increasing day by day and the status quo of gradually entering the field of engineering plastics makes polypropylene modified materials begin to replace traditional engineering plastics such as ABS in a wider range of applications. Among the plastic accessories in China, polypropylene accounts for a large proportion and is used for injection molding top covers, dra...

AI Technical Summary

Problems solved by technology

At present, foreign countries mainly use the same kind of special materials to be synthesized in the polymerization reactor. The initial investment of this process is huge, and the product grade conversion is difficult; the commonly used modification method in China is to simply blend the elastomer and polypropylene resin through simple blending, compatibilization blending, Reactive blending and other methods are used to toughen and modify polypropylene. However, while the toughness of the material is greatly improved, the processing fluidity of the material is significantly worse, and the rigidity (flexural modulus, tensile strength) is also significantly reduced.

There are even fewer reports on high fluidity and high toughness