Compound plastic shell and preparation method and application thereof

Abstract

The invention discloses a compound plastic shell which comprises a fiber structure paper layer and a transparent plastic outer surface layer injection molded to the outer surface of the paper layer, wherein part of melted transparent plastics in the injection molding process enters fiber gaps of the paper layer to be bonded. The invention also discloses a preparation method and an application of the compound plastic shell. According to the compound plastic shell, the melted plastic enters hole structures of the paper layer through the surface hole structures of the fiber structure layers to form a pinning effect and the bonding contact area of the plastic and the paper layer is increased, so that the bonding force of the outer surface of the transparent plastic outer surface and the paperlayer is enhanced, the temperature-resistant circulating number of time is increased, the problem of crack in a using process as the outer surface layer of the transparent plastic and the in-mold decorated plastic film are different in coefficient of thermal expansion is solved, and the service life of an in-mold decorated appearance part is prolonged effectively.

Description

technical field [0001] The invention relates to the field of structural parts preparation, in particular to the field of preparation of consumer electronics backplane structural parts, in particular to a high fracture toughness mobile phone glass backplane and a preparation method thereof. Background technique [0002] With the rapid development of consumer electronics such as mobile phones, structural parts such as shells (backplanes) of consumer electronics have made great progress, but new problems are also encountered. Especially in the future 5G era, more stringent requirements are put forward for the materials of consumer electronics casings (backplanes). Due to its shielding effect, traditional metal poses a huge challenge to antenna design, and it will not be used in the manufacture of 5G casings (backplanes), while the low strength and non-wear resistance of plastics limit its use in large-size screens, ultra-thin In addition, with the improvement of consumer aesth...

AI Technical Summary

Problems solved by technology

However, the mobile phone casing is gradually moving towards a 3D curved surface structure, which results in the inability to print on small places such as the corners of the curved surface, resulting in color leakage. On the flat flexible PET plastic film, the printed plastic film is cut and placed in the mold, and transparent plastic is injected on the surface to realize the colorful plastic shell

In this solution, since the flexible plastic film and the transparent plastic are only bonded surface-to-surface, the bonding area is small, and the thermal expansion coefficients of the two are different, so the composite shell cannot withstand high and low temperature impact cracking in the temperature cycle test. It will also be damaged by delamination and cracking

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