3D printing materials and their preparation methods and applications

Abstract

The invention provides a 3D printing material and its preparation method and application. The printing material includes several modified chopped fibers and a component comprising at least a thermoplastic resin, wherein the end faces of any of the modified chopped fibers are grafted There are active groups, and any part of the modified chopped fiber except the end face is coated with an inert resin, and the inert resin does not react with the active groups. The printing material of the present invention brings the concept of modified chopped fibers, that is, the reactive connection of reinforcement segments, into continuous fiber-reinforced thermoplastic materials, which can not only realize the advantages of continuous fibers in 3D printing, but also maintain this advantage. On the other hand, it is also possible to realize the printing and molding of hollow structures or three-dimensional structures.

Description

technical field [0001] The invention relates to the technical field of 3D molding, in particular to a 3D printing material and its preparation method and application. Background technique [0002] 3D printing, also known as additive manufacturing, is a technology that adds materials layer by layer through printing equipment to manufacture three-dimensional objects based on a pre-designed three-dimensional model. This technology integrates cutting-edge technologies in the fields of digital modeling technology, electromechanical control technology, information technology, material science and chemistry. It is a kind of rapid prototyping technology and is known as the core technology of the "third industrial revolution". The printing technology of thermoplastic resin is the main component, especially the printing technology of continuous fiber reinforcement shows a more prominent prospect with its excellent mechanics and high load-bearing capacity. [0003] At this stage, cont...

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Problems solved by technology

[0003] At this stage, continuous fiber reinforced 3D printing technology has good advantages in printing planar structures or simple structures, with high tensile strength and modulus. However, it is difficult to add fibers to non-printing planes using continuous fibers as 3D printing raw materials. ; Then in this case, if only relying on the adhesive force of the resin, compared with the fiber, there is a significant load difference, thus restricting the application of continuous fiber printing parts on structural parts

At the same time, because the wire contains continuous fibers, it is difficult to use 3D printing technology when forming spatial components (such as lattices), which limits the application of continuous fiber printing technology in lightweight structures or hollow structures.

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