Glue, and plastic and metal composite housing preparation method

Abstract

The present invention provides a glue, and a plastic and metal composite housing preparation method. The glue comprises a main body resin, a tackifying resin, an auxiliary agent and a solvent, wherein the main body resin is an aqueous self-cross-linking acrylic acid resin and a polyamide resin, a mass ratio of the aqueous self-cross-linking acrylic acid resin to the polyamide resin is 2.66-6:1, the glass transition temperature of the aqueous self-cross-linking acrylic acid resin is 40-80 DEG C, and glue further comprises a polyamides treatment agent. According to the present invention, the chemical-resistant polishing test result of the glue layer prepared from the glue is better than the chemical-resistant polishing test result of the control sample; and when the glue of the present invention is used for anode oxidation of the metal and plastic composite housing, no acid hiding is generated, the product yield is high and the drawing force can meet the requirement while the acid hiding phenomenon is generated, the yield is low, the drawing force of the control samples 1-2 is low, and the requirement cannot be met when the control sample is used for anode oxidation of the metal and plastic composite housing.

Description

technical field [0001] The invention belongs to the field of anodic oxidation, and in particular relates to a preparation method of glue and a plastic and metal composite shell. Background technique [0002] With the continuous improvement of people's material living standards and the gradual improvement of designers' concepts, more and more mobile phones use metal integrated structures to improve the grade and service life of mobile phones, so as to achieve innovation and attractiveness in product structure and appearance. consumers' eyeballs. However, because the metal material is conductive, it will also shield part of the signal function, resulting in a low signal capability of the mobile phone with a metal integrated structure. In order to make this structure or type of product more versatile in application or such mobile phone signals will not be blocked by metal. Interfering with substances, it is often necessary to inject a small amount of plastic at an appropriate ...

AI Technical Summary

Problems solved by technology

However, because the metal material is conductive, it will also shield part of the signal function, resulting in a low signal capability of the mobile phone with a metal integrated structure. In order to make this structure or type of product more versatile in application or such mobile phone signals will not be blocked by metal. Substance interference, often need to inject a small part of plastic in the appropriate part to solve this bottleneck

[0003] At the same time, general metals are easy to oxidize. Although the oxide layer has a certain passivation effect, the oxide layer will peel off after long-term exposure and lose its protective effect. Therefore, it is often necessary to anodize the metal surface to strengthen the protective effect on the metal.

However, due to the small gaps in the joint between metal and plastic, the acid and alkali solution during anodizing can penetrate into it, and it cannot be completely cleaned when washing with water, resulting in serious hidden acid in the joint combination of metal and plastic. Phenomenon, increasing the injection pressure of the mold will lead to severe product criticism, affecting the appearance of the product and extremely low yield rate, and the feasibility of mass production of the product is questioned by customers

In severe cases, it will also damage the mold