A kind of graphene 3D printing wire rod and preparation method thereof

Abstract

The invention relates to a graphene 3D printing wire rod and a preparation method thereof. The graphene 3D printing wire rod comprises functional graphene powder and thermoplastic resin. The preparation method comprises pouring thermoplastic resin powder into a width-adjustable metal mold cavity, carrying out stricking and heating to obtain a melt film base, spraying the functional graphene powder into the film base by a micropowder injection method, carrying out primary cooling and demolding to obtain graphene wire rod preforms with different widths, assembling the preforms in an order, putting the assembled body into a metal mold with a hole, carrying out extrusion under heating conditions so that the preforms deform and are fused, and carrying out secondary cooling to obtain the graphene 3D printing wire rod. The graphene 3D printing wire rod has good mechanical properties, conductive performances and flexibility and can easily realize large scale production and cost control.

Description

technical field [0001] The invention relates to a graphene 3D printing wire and a preparation method thereof. It belongs to the field of non-metallic material forming and manufacturing technology, specifically for the preparation of functionalized graphene powder, film substrate preparation, micro-powder spraying, primary cooling, demoulding, prefabricated body assembly, heating extrusion deformation, secondary cooling and other process links . Background technique [0002] 3D printing wire is a unique form of material used in fused deposition manufacturing (FDM). It is generally a thermoplastic material, such as ABS, PLA, nylon, polycarbonate, etc., and is fed in a filamentary form. The material is heated and melted in the nozzle, and the nozzle along the parts The profile of the section and the filling trajectory move while extruding the molten material, which solidifies rapidly and coagulates with the surrounding materials. But this kind of wire has two disadvantages: f...

AI Technical Summary

Problems solved by technology

But this kind of wire has two disadvantages: first, the strength is not high, and the printed products can only be used as sightseeing objects, and it is difficult to be widely used in mechanical parts; second, it is difficult to meet the growing functional requirements of printing components: such as Complex three-dimensional conductive circuits, electronic shielding devices, etc.

[0003] Graphene has good electrical conductivity, thermal conductivity, chemical stability and mechanical properties, but due to its high surface energy, it is easy to agglomerate, which leads to uneven dispersion in the substrate and uncontrollable dispersion range

At present, the dispersion methods mainly include: in-situ polymerization method, solution method, and mechanical mixing method; when the in-situ polymerization method is used to prepare graphene composite materials, the substrate polymerization process, graphite exfoliation process and graphene dispersion process are unified and completed in one step. The time required for the preparation process is greatly reduced, and graphene nanocomposites with relatively uniform dispersion can be obtained, but the reaction conditions of this method are relatively harsh, and the scope of application is limited, which limits its wide application; the solution method has better dispersion and can A high-concentration masterbatch is prepared, but because a large amount of organic solvents are used and it is difficult to recycle, it is not very friendly to the environment; compared with the above two methods, the mechanical blending method is versatile, environmentally friendly and economical. However, this method is still difficult to achieve a good dispersion of graphene in the polymer matrix, resulting in no significant improvement in the mechanical properties of the material, or even a certain decrease

With the increase of modern industry's stringent requirements for versatility, environmental protection, economy and controllability of graphene dispersion range, the above three process methods are difficult to meet the requirements

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