3D printing wire prepared from polylactic acid recycling material and preparation method

Abstract

The invention belongs to the field of preparation of macromolecular 3D printing wires, and discloses a 3D printing wire prepared from a polylactic acid recycling material and a preparation method. Forovercoming the shortcomings that the polylactic acid recycling material can be degraded after being subjected to several times of high-temperature extrusion processes, thus, the prepared 3D printingwires are high in brittleness, not high in tensile property, not smooth in surface and uneven in wire diameter, and a 3D model printed by the material deforms severely, has obvious interlayer concavemarks and is low in surface gloss, the polylactic acid recycling material is added with functional auxiliaries such as a chain extender, a chain extending accelerant, a flowable agent and a tougheningagent, the prepared wire is stable in diameter and smooth in surface, when printed by an FDM method, the material is extruded stably, and the prepared 3D printed device is smooth and flat in surfaceand does not deform.

Description

technical field [0001] The invention belongs to the field of polymer 3D printing wire preparation, and in particular relates to a 3D printing wire prepared by using polylactic acid recycled materials and a preparation method. Background technique [0002] As a degradable polymer material, polylactic acid (PLA) is widely used in the preparation of 3D printing filaments because of its good processing performance, dimensional stability and coloring and dyeing properties. However, at present, the shelf life of PLA printing filaments is generally relatively short. The vacuum-packed filaments are generally 3 to 6 months, and the ones exposed to the air are 1 to 2 months. PLA printing filaments that exceed the shelf life are fed by the printer during the printing process. The pulling of the driving force is easy to break, resulting in the interruption of the printing wire supply and the stop of 3D printing. If such wire rods are scrapped at this point and cannot be used again, mor...

AI Technical Summary

Problems solved by technology

But at present, the shelf life of PLA printing filaments is generally relatively short. The vacuum-packed filaments are generally 3 to 6 months, and the ones exposed to the air are 1 to 2 months. PLA printing filaments that exceed the shelf life are fed by the printer during the printing process. The pulling of the driving force is easy to break, resulting in the interruption of the printing wire supply and the stop of 3D printing

If this kind of wire is scrapped and cannot be used again, there will be a lot of waste, which is not conducive to the full utilization of resources

[0003] However, PLA wire is a material that is easily degraded. After several high-temperature extrusions, more PLA materials will degrade, and the flow performance is unstable, which makes it difficult to pull the wire into a circular shape with a stable diameter during the extrusion preparation process. Wire rods, the prepared wire rods are not smooth in appearance, have raised or pitted defects, and the thickness of the wire diameter exceeds the controllable range; the printed parts made of this wire rod by 3D printing (fused deposition method, FDM) have obvious formations The dents between the 3D printed parts and even the deformation appear at right angles and sharp corners, which seriously affect the quality and appearance of 3D printed devices.

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