Low-density and low-shrinkage-rate silver metal texture polypropylene composite material and preparation method thereof

Abstract

The invention discloses a low-density and low-shrinkage-rate silver metal texture polypropylene composite material and a preparation method thereof. The polypropylene composite material comprises high-crystallized polypropylene, high-melt-value polypropylene, low low-shrinkage-rate polypropylene, hollow glass beads, ultra-white and ultra-fine talcum powder, toughening fillers, metal pigments, nano-zinc sulfide, hyperbranched resin, antioxidants and scratch-resistant agents. In the injection molding process of the free-spraying polypropylene composite material, obvious welding marks on the surface of the material are omitted, the appearance of the material approaches to spraying effects, components can be directly used, later spraying treatment is omitted, cost is saved, the material is green and environmentally friendly, the density of the material is much lower than that of common modified polypropylene, lightweight requirements of clients are met, the shrinkage rate of the material is lower than 0.5, the material can directly replace ABS (acrylonitrile butadiene styrene) in the field such as household electric appliance shells, secondary mold opening is omitted, and cost is saved.

Description

technical field [0001] The invention relates to a polypropylene composite material, in particular to a polypropylene composite material with low density, low shrinkage rate and silvery metallic texture and a preparation method thereof, belonging to the technical field of polypropylene modification. Background technique [0002] As a general-purpose plastic, polypropylene has the advantages of low price and good heat resistance, and is widely used in automobiles, home appliances, office supplies and various electronic appliances. However, as a non-polar material, polypropylene is difficult to spray on the surface; as a general-purpose plastic, the mechanical properties of the material itself are poor, and most polypropylene must be modified in the later stage before it can be used in the fields of home appliances and automobiles. Avoid drastically increasing the density of the material. In recent years, the home appliance and automobile industries have been limited by cost a...

AI Technical Summary

Problems solved by technology

However, the cell size obtained in this method is not uniform, and the cell size is difficult to control, which is not conducive to the dispersion of metal pigments in the matrix material, and then reduces the appearance effect of the material

[0005] The current polypropylene composite materials generally have a density of 1.1g / cm 3 It does not meet the customer's demand for material weight reduction; the shrinkage rate of commercially available polypropylene composite materials is above 1.2%. When replacing high-cost ABS with low-cost polypropylene composite materials, direct switching of materials cannot be realized. Customers need Bear the high cost of mold replacement, which is not conducive to the promotion of polypropylene composite materials; the surface spraying of polypropylene is difficult, high cost, and serious environmental pollution

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