A kind of polypropylene composite material with low density, low shrinkage rate, silver metal texture and preparation method thereof

Abstract

The invention discloses a polypropylene composite material with low density, low shrinkage rate and silver metallic texture and a preparation method thereof. The polypropylene composite material includes the following components: high crystalline polypropylene, high melting index polypropylene, low shrinkage polypropylene, hollow glass microspheres, ultra-white ultra-fine talc, toughening fillers, metal pigments, nano-zinc sulfide , Hyperbranched resin, antioxidant, scratch resistant agent. The spray-free polypropylene composite material in the present invention has no obvious welding marks on the surface during the injection molding process, and the appearance is close to the spraying effect; the parts can be used directly, without the need for later spraying treatment, which saves costs and is environmentally friendly; the material density is relatively ordinary Modified polypropylene is much lower, which meets customers' requirements for lightweight; the shrinkage rate of the material is as low as 0.5, which can be directly used to replace ABS in the fields of home appliance shells and other fields, without re-opening the mold, saving costs.

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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