Modified nylon material for 3D printing applied to FDM (fused deposition molding) technology and printing method of modified nylon material

Abstract

The invention relates to a modified nylon material for 3D printing applied to an FDM (fused deposition molding) technology and a printing method of the modified nylon material. The modified nylon material is prepared from a nylon resin matrix and a tackifying nucleating agent, wherein the tackifying nucleating agent is formed by compounding of an ionic liquid and carbon nano-filler. A preparation method comprises the steps as follows: (1) the carbon nano-filler and the ionic liquid are mixed and subjected to mechanical milling, and the tackifying nucleating agent is prepared; (2) the tackifying nucleating agent is blended with nylon resin and then molten and extruded by a double-screw extruder for cooling granulation; (3) granules are extruded and machined into wire materials for 3D printing after being dried. The printing method comprises the steps as follows: FDM equipment is used for depositing and printing the wire materials for 3D printing layer by layer into a product in accordance with ISO standards, and then the obtained product is subjected to ultrasonic cleaning, drying and heat treatment. According to the modified nylon material provided by the invention, the occurrence of edge warping in a 3D printing process can be effectively prevented, and the finally printed product has the advantages of outstanding mechanical property, optimum dimensional stability, smooth surface, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and relates to a 3D printing modified nylon material applied to FDM technology and a printing method thereof. Background technique [0002] 3D printing technology (also known as 3D rapid prototyping or additive manufacturing technology) is a new manufacturing technology that emerged and developed in the late 1980s. Compared with traditional manufacturing technology, 3D printing technology can manufacture arbitrarily complex three-dimensional geometric entities, and the manufacturing cycle is greatly shortened, and the preparation cost is greatly reduced. 3D printing technology proposes a new thinking mode in terms of forming principles, that is, according to the principle of "layered manufacturing, layer by layer superposition", it can be modeled by computer 3D according to data such as computer-aided design (CAD) models or CT tomographic scans. After conversion, it is input into the compute...

AI Technical Summary

Problems solved by technology

Among them, ABS resin is a two-phase heterogeneous structure with graft copolymer as the rubber phase and styrene-acrylonitrile as the matrix phase, so that it has the chemical resistance, oil resistance and surface hardness of acrylonitrile, butadiene The cold resistance and toughness of styrene, the good dielectric properties, gloss and processability of styrene, but its mechanical strength is not high, and as the molecular weight increases, the processability decreases

However, PLA has poor mechanical properties and is prone to brittle fracture, especially in the process of melting and molding, which greatly limits the use of printed parts.

Among nylon materials, nylon 12 is currently used more, such as nylon 12 developed by Stratasys in the United States, mainly because nylon 12 has the lowest melting temperature among nylon materials, and its water absorption and molding shrinkage are relatively small. Most suitable as 3D printing material, but it is expensive and the mechanical properties of the product are poor

However, other pure nylon materials are greatly limited due to their molecular structure, mainly in high forming temperature, large forming shrinkage, slow crystallization speed, low melt viscosity and sag resistance when the processing temperature is higher than the melting point. Poor performance. When printing with FDM technology, the filament extruded from the nozzle is prone to collapse on the forming platform. At the same time, due to shrinkage between layers, defects such as edge warping and even cracking occur, which affect the smooth progress of the 3D printing process and the performance of the formed part.

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