High-strength rainbow film and preparation method thereof

Abstract

The invention discloses a high-strength rainbow film and a preparation method thereof, and belongs to the technical field of thin films, the high-strength rainbow film comprises a plurality of A layers, B layers and C layers which are arranged by combining ACBCACB... A. The A layers comprise polystyrene resin, the B layers comprise polypropylene resin, the C layers comprise a copolymer mixture of polypropylene and polystyrene, and the copolymer mixture of the polypropylene resin and the polystyrene resin is a copolymer mixture of the polypropylene resin and the polystyrene resin. The copolymer mixture of polypropylene and polystyrene is formed by mixing polystyrene powder and modified polypropylene, and the modified polypropylene is obtained by grafting styrene on a polypropylene molecular chain through an initiator. According to the high-strength rainbow film and the preparation method thereof disclosed by the invention, the copolymer mixture of polypropylene and polystyrene has good compatibility with polypropylene and polystyrene at the same time, so that connection among the layer C, the layer A and the layer B can be increased, the layering probability of the rainbow film is reduced, stress transfer between layers is increased, and the tensile strength of the rainbow film is improved. The overall strength of the rainbow film is improved.

Description

technical field [0001] The invention relates to the technical field of thin films, in particular to a high-strength rainbow film and a preparation method thereof. Background technique [0002] Multilayer light interference film is a kind of film with light interference effect made of two or more thermoplastic transparent resins with different refractive indices through multi-layer composite co-extrusion. In the wavelength range of visible light, according to the thickness of the film It can emit different colors, which is called iridescent film commercially, but there are not many kinds of raw resin used to produce iridescent film, mainly because the raw resin generally requires a high refractive index and the refractive index difference between different raw resins is required. At present, the rainbow films produced in the world are generally PMMA / PBT, PMMA / PET, and combinations of LLDPE, LDPE, PP / propylene-ethylene copolymers, propylene homopolymers, etc., of which PP / PS i...

AI Technical Summary

Problems solved by technology

[0003] However, due to the low compatibility between PP and PS, the bonding force between the layers is weak, which makes the iridescent film prone to delamination, and when the iridescent film is stretched, the layers will be separated. Debonding occurs and voids are formed, reducing the overall elongation at break of the iridescent film and reducing the overall strength of the iridescent film

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