Preparation method of fiber-reinforced thermoplastic composite filaments for 3D printing

Abstract

The invention provides a preparation method of fiber-reinforced thermoplastic composite filaments for 3D printing, and belongs to the technical field of 3D printing. The preparation method comprises the following steps of firstly spreading carbon fiber tows, then preheating the fiber tows, performing fiber and thermoplastic resin impregnating, and finally sizing, cooling and rolling through a sizing mold to obtain the continuous fiber 3D printing filaments. By means of the preparation method, the continuous fiber composite 3D printing filaments are prepared by homogenizing the fiber tows through thermoplastic resin, the composite filaments have the advantages of high strength and high modulus, and a prepared 3D printing sample piece has the advantages of high mechanical property and the like. The method can be used for efficiently and continuously preparing the 3D printing filaments.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a method for preparing filaments of fiber-reinforced thermoplastic composite materials for 3D printing. Background technique [0002] 3D printing technology, also known as additive manufacturing, has recently spread around the world due to its rapid manufacturing capabilities. Among them, fused deposition modeling (FDM) is the most widely used 3D printing technology because it uses inexpensive equipment and is easy to use to build complex parts with thermoplastic filaments, such as polylactic acid, nylon or ABS, etc. However, a major disadvantage of prototypes printed with pure thermoplastic screens is poor mechanical properties, which limits applications. [0003] Continuous fibers play a vital role in the field of composite materials due to their excellent mechanical properties and lightweight properties. Compared with short fiber reinforced thermoplastic resin, the stren...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for preparing fiber-reinforced thermoplastic composite material filaments for 3D printing, so as to solve the problem that the existing 3D printing fiber thermoplastic composite material filaments cannot be prepared with high fiber content, uniform fiber distribution and long thermoplastic composite materials. The cross-sectional diameter of the filament can be controlled. This preparation method can continuously prepare ultra-fine 3D printing composite filaments. The prepared filaments have low porosity after 3D printing, so that the mechanical properties are improved and the production efficiency is high.

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