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Preparation method alloy-plastic composite shell

A technology of alloy and plastic, which is applied in the field of preparation of alloy-plastic composite housing, and can solve problems such as acid spit and corrosion of oxide film

Active Publication Date: 2017-06-23
GUANGDONG EVERWIN PRECISION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NMT (nano-injection molding) treatment technology has greatly strengthened the gold-plastic integration, but even if the shell is formed by nano-injection molding, acid liquid still overflows from the shell surface during the anodic oxidation process of the shell, resulting in acid spitting Phenomenon, corrosion oxide film

Method used

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  • Preparation method alloy-plastic composite shell
  • Preparation method alloy-plastic composite shell
  • Preparation method alloy-plastic composite shell

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preparation example Construction

[0021] see figure 1 , The method for preparing an alloy-plastic composite casing according to one embodiment includes the following steps S110-S130.

[0022] S110. An alloy base is provided, and a slit is opened on the alloy base.

[0023] The present invention has no limitation on the material of the alloy substrate, and any alloy containing multiple metal elements can be used as the alloy substrate.

[0024] In this embodiment, the alloy substrate is an aluminum alloy substrate, and the width of the gap is 3 μm˜10 μm. The gap is injected and filled with plastic material to form an alloy-plastic composite shell. Aluminum alloy is cheap, easy to process and shape, and the material is light. It is suitable as the casing of electronic products such as mobile phones and computers.

[0025] Specifically, the slits can be formed on the aluminum alloy substrate by means of laser cutting, electron beam cutting or water cutting.

[0026] S120 , injection molding plastic material i...

Embodiment 1

[0043] A gap of 5 μm is opened on the surface of the aluminum alloy substrate. Fill the polydibutyl terephthalate into the gap by injection molding, and hold the pressure for 5s under the pressure of 1500kPa. During the pressure holding stage, the polydibutyl terephthalate is continuously injected and filled into the gap, and after cutting and grinding, the obtained Semi-finished products, pickling, cleaning liquid cleaning and water washing for semi-finished products. The washed semi-finished product is baked at 180°C for 40 minutes and immediately soaked in the electrolyte. The electrolyte contains 120g / L of concentrated sulfuric acid and 40g / L of oxalic acid. The voltage is 18V and the temperature is 18°C. Under electrolysis, an oxide film is formed on the surface of the semi-finished product to obtain an alloy-plastic composite shell.

Embodiment 2

[0045] A gap of 10 μm is opened on the surface of the aluminum alloy substrate. Fill the gap with polypropylene injection molding, and hold the pressure for 7s under the pressure of 1200kPa. During the pressure holding stage, the polypropylene is continuously injected and filled into the gap, and the semi-finished product is obtained after cutting and grinding. The semi-finished product is pickled, cleaned with cleaning solution and washed with water. The semi-finished product after washing is baked at 160°C for 60 minutes and immediately soaked in the electrolyte. The electrolyte contains 80g / L of concentrated sulfuric acid and 150g / L of oxalic acid , electrolyze under the conditions of voltage 15V and temperature 22°C to form an oxide film on the surface of the semi-finished product to obtain an alloy-plastic composite shell.

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Abstract

The invention discloses a preparation method of an alloy-plastic composite shell. The preparation method of the alloy-plastic composite shell comprises the steps that a seam in an alloy substrate is filled with a plastic material through injection molding, and pressure maintaining is conducted for 4-7 s under the pressure of 1200-1800 kPa; the pressure maintaining time is prolonged and higher pressure is maintained, so that the plastic material continues to be injected into the seam, and the size of a small gap in the junction of the plastic material and alloy is reduced; and residual acid liquor is little after cutting and grinding and cannot overflow. After a semi-finished product is baked for 30-60 min at the temperature of 160-200 DEG C, anodic oxidation is conducted; the operation of braking treatment is adjusted to be conducted before the operation of anodic oxidation, the plastic material expands to squeeze the alloy after being baked at the high temperature, and the size of the small gap is slightly increased after cooling so that residual acid can be washed away more thoroughly in the anodic oxidation surface-conditioning procedure, residual acid is removed, and thus the situation of acid overflowing is restrained.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a method for preparing an alloy-plastic composite shell. Background technique [0002] In recent years, metal alloys have been used more and more in the fields of electronic products such as mobile phone casings, computer casings, and frames. In particular, the mobile phone shell generally uses a combination of alloy and plastic, so that the mobile phone signal is not shielded by the alloy. NMT (nano-injection molding) treatment technology has greatly strengthened the gold-plastic integration, but even if the shell is formed by nano-injection molding, acid liquid still overflows from the shell surface during the anodic oxidation process of the shell, resulting in acid spitting Phenomenon, corrosion oxide film. Contents of the invention [0003] Based on this, it is necessary to provide a method for preparing an alloy-plastic composite shell that can reduce the phe...

Claims

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Application Information

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IPC IPC(8): C25D11/16C25D11/08C25D11/10C25D7/00B29C45/14B29C45/76B29C45/77
CPCB29C45/0055B29C45/14B29C45/76B29C45/77B29C2045/0058B29C2045/14868B29C2945/76498B29C2945/76551B29C2945/76561C25D7/00C25D11/08C25D11/10C25D11/16
Inventor 王天宇
Owner GUANGDONG EVERWIN PRECISION TECH
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