PLA/TPU two-component filament used for 3D printing and preparation method of filament

Abstract

The present invention provides a PLA / TPU two-component filament used for 3D printing and a preparation method of the filament. A 3D filament with a ''skin-core'' structure is prepared by adopting a self-developed 3D filament extrusion production line, a skin layer is a PLA material, a core layer is a mixture of a proper amount of hydrophobic nano silicon dioxide and polyester-typed TPU, PLA / TPU two-component is separately placed into an A extrusion screw and a B extrusion screw according to a certain ratio, wherein the processing temperature of I-VI areas (DEG C) of the A extrusion screw is respectively 195-200, 185-190, 190-195, 190-195, 190-195 and 185-190, and the processing temperature of I-VI areas (DEG C) of the B extrusion screw is respectively 190-195, 200-205, 200-205, 205-210, 205-210, and 200-205, through a proper amount of the hydrophobic nano silicon dioxide and the polyester-typed TPU, the bonding force between the PLA and the TPU is improved, and the PLA / TPU two-component filament is prepared by co-extrusion of a special die head. The PLA / TPU two-component filament provided by the invention has the beneficial effects that the PLA / TPU two-component filament not only overcomes the defects of high brittleness and poor impact resistance of a PLA filament, but also overcomes the defect that the winding of a TPU material is easy to stick and difficult to print, is suitable for 3D printing, rich in elasticity and easy to print, and can be used for printing of joint connection positions.

Description

technical field [0001] The invention relates to the technical field of 3D printing manufacturing, in particular to a PLA / TPU two-component wire for 3D printing and a preparation method thereof. Background technique [0002] 3D printing technology, that is, additive manufacturing technology, is an emerging rapid prototyping technology. It is a technology based on digital model files, using bondable materials such as powdered metal or plastic, to construct objects by layer-by-layer printing, without the need for mold manufacturing, saving time and cost of mold manufacturing. The basic principle is additive manufacturing, the technique of adding material layer by layer to generate a three-dimensional solid. As the core technology to promote the revolution of the tertiary industry, 3D printing has the characteristics of networking, digitization, and personalization, and it is gradually used in medicine, bioengineering, construction, clothing, aviation and other fields. [0003...

AI Technical Summary

Problems solved by technology

However, due to the high glass transition temperature of PLA, it is hard and brittle at room temperature, and it is difficult to apply to the printing of joint joints, which seriously limits its application in the field of 3D printing.

[0004] Thermoplastic polyurethane elastomer (TPU) has good flexibility. 3D consumables developers continue to try to extrude consumables with TPU materials, but TPU wires are easy to stick when reeled, difficult to feed materials during 3D printing, and low printing efficiency, etc., have become restrictions on its application. The main reason in the field of 3D printing