Preparation method of metal resin complex and metal resin complex prepared thereby

Abstract

The invention provides a preparation method of an aluminum alloy resin complex and the aluminum alloy resin complex prepared thereby. The preparation method of the aluminum alloy resin complex comprises the following steps: S1, anodic oxidation: a metal substrate with a surface comprising an anodic oxidation film layer is obtained by anodic oxidation of a pretreated metal substrate, and the metal substrate is an aluminum alloy substrate or aluminum substrate; S2, treatment with an etching liquid: the metal substrate containing the anodic oxidation film layer and obtained by the step S1 is immersed in the etching liquid for treatment to obtain a surface treated metal substrate; S3, injection: the surface of the surface treated metal substrate is injected with a resin composition, and then the metal resin complex is obtained after molding; and the etching liquid contains HCl and a soluble halogen acid salt, or contains H3PO4 and a soluble phosphate. In the metal resin complex, the binding force between aluminum alloy and resin is strong, and the process is simple, and is easy for large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a metal-resin composite and the prepared metal-resin composite. Background technique [0002] In the field of parts manufacturing of automobiles, household electrical appliances, industrial machines, etc., the integrated molding technology of metal and resin is required. At present, the industry uses adhesives to integrate metal and synthetic resin at room temperature or under heating. Although the above method can be used to prepare a composite body formed of metal and plastic, the bonding force between the metal and plastic of the composite obtained according to these methods is poor, and the adhesive has poor acid and alkali resistance, and the composite body cannot be subsequently anodized. And other surface treatment. Therefore, people have been studying whether there is a more reasonable way to integrate high-strength engineering resins with alloys such as aluminum alloys. [0003] Those skilled i...

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Problems solved by technology

[0004] The existing integrated molding technology of aluminum alloy and resin composition is disclosed, using amine substances, such as: carbamate, hydrazine monohydrate, ethylenediamine and other aqueous solutions to treat the surface of aluminum alloy to obtain nano-scale microstructures. holes, corrode nano-scale holes, and retain the amine groups in the nano-holes of the aluminum alloy, and finally inject the resin and the aluminum alloy through the reaction of the amine groups and the injection molding material, so as to obtain a certain tensile strength. The aluminum-plastic integrated product with high tensile and shear strength, but using this kind of amine corrosion technology, the holes formed on the surface of the aluminum alloy are too small, and it is difficult for the resin to be directly injected into the nano-scale holes, which reduces the bonding strength between the aluminum alloy and the resin , that is, the tensile performance is poor. At the same time, the combination of resin and aluminum alloy mainly relies on amine groups, and the types of resins used are very limited. At present, the resins that can be used in this technology are only PPS (polyphenylene sulfide), PA (poly Amide), PPA (polyphthalamide resin), PBT (polybutylene terephthalate) and other four types of resins, the practical application range is also narrow, and the amines used are toxic and volatile Substances that are not conducive to safe production and poor environmental performance

[0005] There is also an acid etching solution containing inorganic halogen compounds directly corroded on the surface of aluminum alloy, and then injection molded to obtain an aluminum-plastic integrated product. However, the technology of using this type of etching solution to corrode the surface of aluminum alloy has low concentration of the etching solution for a long time, and the concentration of the etching solution High reaction heat release is large, the temperature is not easy to control, and the corrosion will be more severe as the temperature rises, forming a vicious circle, which is easy to cause rapid volatilization of the corrosive liquid, splashing of the corrosive liquid and serious discoloration of the aluminum alloy surface during violent reactions, etc. It is not conducive to large-scale production, and with this method, the bonding force between metal and resin is poor

[0006] There is also an aluminum oxide film layer with holes with a diameter of 0.05-0.08 microns prepared by anodizing on the surface of the aluminum alloy, and then combined with a resin to obtain an aluminum-plastic integrated product, but the holes formed on the surface of the aluminum alloy obtained by this method are too small and It is difficult for the resin to be directly injected into the nano-scale holes, which reduces the bonding strength between the aluminum alloy and the resin, that is, the tensile properties are poor

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