Method for preparing high thermal conductivity insulating 3D printed products by using waste aluminum-plastic packaging

Abstract

The invention provides a method for preparing high thermal conductivity and insulation 3D printing products by using waste aluminum-plastic packaging materials. Ultrafine powder, blended and extruded into 3D printing filaments, the unique process temperature conditions in the process of fused deposition molding 3D printing make the expandable graphite expand in situ, and release the intercalation agent in the confined space, so that The in-situ oxidation reaction occurs on the surface of aluminum metal, and at the same time, the high shear force in the fused deposition molding 3D printing process is used to realize the special orientation and network structure construction of two-dimensional nanomaterials, thereby preparing high-performance thermally conductive and insulating 3D printed products. The thermal conductivity of the 3D printed product prepared by the present invention is not less than 2.5W / mK, and the electrical conductivity is less than 10 ‑10 S / cm, the tensile strength is not less than 12Mpa.

Description

technical field [0001] The invention belongs to the technical field of recycling waste aluminum-plastic packaging materials, and specifically relates to a method for using waste aluminum-plastic packaging materials to prepare 3D printing products with high thermal conductivity and insulation, and particularly relates to the use of the mechanochemical reactor disclosed in the Chinese authorized invention patent ZL95111258.9 The above-mentioned waste aluminum-plastic packaging materials are processed. Background technique [0002] Aluminum-plastic packaging is composed of metal aluminum and plastic. It has a unique multi-layer structure that can block water vapor, gas and ultraviolet rays. It is widely used in the packaging fields of food, electronics and pharmaceuticals. my country's aluminum-plastic packaging is growing rapidly, but its service life is relatively short, resulting in a large number of waste aluminum-plastic packaging, which is conservatively estimated to exce...

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Problems solved by technology

[0004] However, in the technical scheme disclosed in the above-mentioned patent, the necessary technical means is to introduce oxygen in situ to oxidize the aluminum flakes in the aluminum-plastic packaging material during the grinding process of the aluminum-plastic packaging material by the solid-phase force chemical reactor. The process conditions have the following disadvantages: 1. The solid-phase mechanochemical reactor is the mechanochemical reactor disclosed in patent ZL 95111258.9, and its double-grinding-disc structure and the high pressure between the milling discs determine that in the grinding process, the material therein It is a very difficult process condition to feed a sufficient amount of oxygen while shearing and milling. On the one hand, there are limited ways to feed oxygen to the surface of the grinding disc, and on the other hand, the aluminum sheet does not have enough contact with oxygen during the grinding process. Sufficient, the formed alumina sheet is limited; Second, the proportion of graphite is relatively high. If it is applied to 3D printing technology, because the inorganic filler cannot be melted at the temperature of the 3D printing process, the increase of the proportion of graphite will As a result, the viscosity of the compound increases, and an excessively high proportion of graphite will block the flow channel of 3D printing, making it impossible to produce silk products smoothly.

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