3D printing method of fiber-grade flame retardant product based on reactive extrusion

Abstract

The invention relates to a 3D printing method of a fiber-grade flame retardant product based on reactive extrusion. According to the 3D printing method, polymerization reaction is performed on a lactam monomer and / or a lactone monomer and an assistant and a plasticizer after fusing under the action of a catalyst, and a flame retardant is added before polymerization or during polymerization to obtain a target polymer; then the target polymer is subjected to fused deposition 3D printing, and then is subjected to thermal treatment, thus obtaining a final product. According to the invention, a high-precision high-adaptation 3D printer is adopted, the forming precision is high, the efficiency is high, the mechanical property of a product is good, and the dispersibility of a functional component is good; and a process of preparing a product directly from a polymeric monomer is adopted, and therefore, the production flexibility is improved, and the conditions of edge warping of nylon, polyester and other semi-crystalline polymers caused by crystallization and large temperature difference, and even failure in printing can be avoided. The method can widen the species of fused deposition 3D printing materials, can improve the quality of products, and is wide in application in the fields of automotive materials, engineering plastics, building materials and the like.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and relates to a 3D printing method of a fiber-level flame-retardant product based on reaction extrusion, in particular to a 3D printing method from a monomer directly to a flame-retardant 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 b...

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

In the process of making functionalized 3D printing raw materials, the method of blending is usually used, which is difficult to achieve uniform distribution of functional components, especially nano-scale functional powders are prone to agglomeration during the blending process, resulting in functional Reduced effect and unstable product quality, and may cause nozzle clogging due to accumulation of functional components

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.