A kind of preparation method and application of composite material for nano injection molding

Abstract

The invention provides a preparation method for a nano injection molding composite material. The method sequentially includes the following steps of mechanical pretreatment, two-step pre-etching, primary DC electrified corrosion, secondary dipulse electrified corrosion, aftertreatment, drying and nano injection molding. Ultrasonic assisted corrosion happens in the electrifying process. A base material of the composite material refers to one of aluminum alloy, titanium alloy, magnesium alloy or stainless steel. The preparation method for the nano injection molding composite material can be applied to preparation of mobile communication terminal shells.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a preparation method and application of a composite material for nano-injection molding with stainless steel, titanium alloy, and aluminum alloy as base materials. Background technique [0002] Japan's Taiseiplas Co., Ltd. invented nano-molding technology (NMT) in 2002. This technology is a nano-molding technology that integrates metal and plastic. It can integrate metal and resin and is widely used in thin, light and portable products. On the casing of mobile electronic products, such as computer terminals and mobile phones. [0003] In the current technology, the treatment process of NMT includes the following process: the metal to be combined is treated with lye, acid, and weak acid, and then cleaned with water, then dried, and then injected. After treatment, countless micropores with a diameter of about 20nm will be formed on the metal surface. , to produce an anchori...

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Problems solved by technology

After treatment, countless micropores with a diameter of about 20nm will be formed on the metal surface. That is to say, it can be considered that many tiny concave-convex structures are formed on the treated metal surface, and the injected resin enters these concave-convex structures. , produce an anchoring effect, in other words: the metal substrate first removes impurities such as grease and other impurities on the surface by alkali washing, removes metal oxides on the surface by acid washing and etches nano-scale holes; Small nano-scale holes; the metal after washing and drying is clamped in the mold, and the plastic injection molding achieves an integrated structure. From the above records, it can be concluded that the key technology of NMT lies in the processing of the substrate and the operation of nano-injection molding, while Removing the metal oxide on the surface by pickling and etching out nano- or micron-sized holes often leads to large-area over-corrosion, which not only fails to form effective pores, but also causes planar dissolution corrosion, which seriously loses the substrate metal. In addition, acid corrosion The formed pores are mainly concentrated at the nanoscale. Because the pores are too small, it is not conducive to the flow injection of the resin, and it is easy to form an air barrier, which is not conducive to the contact between the resin and the substrate. Therefore, the current nano-injection molding of metal substrates faces the following problems: (1 ) The corrosion holes of the base material are small, and the depth of the channels is shallow, and the channels cannot be effectively penetrated; (2) Due to the poor formation of the channels, it is not conducive to the adhesion of the resin, resulting in weak bonding between the resin and the base material, and the resin and the base material There is a large difference in the binding force between them, and the binding uniformity is poor

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