Fiber-scale reactive extrusion 3D printing method

Abstract

The invention relates to a fiber-scale reactive extrusion 3D printing method including the steps of: a) fusing a lactam monomer and / or a lactone monomer, and an additive and an ionic liquid, and performing a polymerization reaction under the effect of a catalyst to prepare a target polymer; and b) performing fused deposition 3D printing to the target polymer and performing thermal treatment to obtain a finish product, wherein the thermal treatment is carried out at 100-180 DEG C for 3-60 min. In the invention, a high-precision high-adaptability 3D printer is employed, so that the method has high shaping precision and efficiency and the finish product has good mechanical performance. A process, in which the polymerization monomers are directly processed to obtain the finish product, is employed, so that the method is improved in production flexibility and also avoids the problems of edge warping and even printing failure since semi-crystallized polymers, such as nylon, polyester and the like, are crystallized and are large in temperature difference, thereby avoiding reduction of performance of the finish product due to degradation of the polymers. The method increases the types of fused deposition 3D printing materials, improves quality of the finish product, and has wide applications in the fields of crafts, machines, chemical engineering, instruments, automobiles and the like.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and relates to a fiber-level reactive extrusion 3D printing method, in particular to a 3D printing method directly from a monomer to a product. Background technique [0002] 3D printing technology is a rapid prototyping technology that is gradually becoming popular at present. This is a green desktop rapid prototyping technology, which has the advantages of small size, low cost, low pollution, and convenient use. The basic principle is to use polymer materials as the base material, adopt fused accumulation molding or fused deposition molding technology, complete the structure and formation of object pairs by layer-by-layer printing, and finally form products by layer-by-layer stacking, which can be built layer by layer under precise positioning. various three-dimensional objects. [0003] Using the characteristics of 3D printing, it can be controlled by software, and through the transformati...

AI Technical Summary

Problems solved by technology

[0005] From the perspective of existing technology, functional composite materials and products for 3D printing have been reported, but there are still some problems, mainly in the following aspects: Among the polymer raw materials, mainly pre-polymerized materials cannot be quickly regulated The bulk properties of the material; during the 3D printing process, the polymer needs to be remelted, and because the melting tube of the conventional 3D printing is short, in order to ensure the melting of the polymer, the heating temperature needs to be raised to 20-50°C above the melting point of the polymer , this secondary processing process affects the performance of the polymer itself, and it is easy to produce low molecular weight, and bubbles are prone to appear during the printing process, which affects the performance of the part. At the same time, the remelting process is also a waste of energy

For nylon and polyester materials, they have strong water absorption, relatively poor chemical stability, inconvenient storage of materials, and are not suitable for industrialization. These are important factors that limit the development of 3D printing nylon and polyester materials.