3D printing device and method for high-molecular-weight silicone rubber

Abstract

The invention discloses a 3D printing device and method for high-molecular-weight silicone rubber. A hundred-micron-level micropore nozzle with the high shearing rate and high extruding strength and for screw extruding force is adopted in a 3D printing head system, the flowing viscosity of the high-molecular-weight silicone rubber is greatly reduced, and 3D printing forming of a high-molecular-weight, high-compression-modulus and long-service life silicone rubber material is achieved. The extrusion and expansion stability of the material on the hundred-micron-level micropore nozzle is improved, the dimensional precision of a 3D printing fluid line is accurately controlled, and high quality, high precision and high efficiency in the 3D printing process are achieved. A photo-thermal two-order curing material 3D printing manner is adopted, the curing rate and dimensional precision of the 3D printing material are greatly increased, the high quality and stability of the 3D printing high-molecular-weight silicone rubber material are improved, and the macro-performance and structure adjustability of the 3D printing material are achieved.

Description

technical field [0001] The invention relates to the technical field of 3D printing of high-viscosity materials, in particular to a 3D printing device and printing method for high-molecular-weight silicone rubber. Background technique [0002] The existing silicone rubber 3D printing system is an additive manufacturing system based on 3DP printing technology (droplet jetting), which relies on the gravity of the material itself or the extrusion force of the piston to extrude low molecular weight, low viscosity and fluidity through the micropores of the printing nozzle. Better silicone rubber droplets or fluids, droplets or fluids blend with each other to form streamlines and quickly UV-cured into elastomers, which can regulate the spatial distribution of printing droplets and fluids during the printing process, thereby preparing materials with macroscopic properties and structures. Adjustable porous or solid silicone rubber products. However, the existing silicone rubber 3D p...

AI Technical Summary

Problems solved by technology

[0003] 1. Most of the existing silicone rubber 3D printing methods use traditional inkjet printing nozzles in 3DP printing technology. Due to the limitation of the gravity of the material itself and the small extrusion force of the piston, only low molecular weight, low viscosity and fluidity can be printed. Good silicone rubber, but its own poor elasticity and low compression modulus, the printed silicone rubber material is relatively brittle and easy to curl, making it difficult to be widely used in industry

[0004] 2. The existing silicone rubber 3D printing method relies on two molding methods: the gravity of the material itself and the extrusion pressure of the piston, so the density of the printed material is low, and the output is slow, the molding efficiency is low, and it is difficult to accurately control the 3D printing The dimensional accuracy of droplets and fluids after nozzle extrusion and expansion cannot achieve high quality, high precision and high efficiency in the 3D printing process

[0005] 3. The existing silicone rubber 3D printing method relies on ultraviolet light for curing, the curing efficiency and degree are low, it is difficult to quickly cure and shape in a short time, and the area at the center of the fluid is prone to cross-linking and curing is not complete, thus affecting silicone rubber Quality stability of printed products

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