3D printing technology with its personalized customization, rapid prototyping and other advantages, has become a popular direction in the field of industrial design. Widely used in medical equipment, automobile manufacturing, industrial design and many other fields. At present, the scope of application of 3D printing has gradually gone from theoretical models to actual industrial production. This makes 3D printing better close to people's production and life, and lays the foundation for desktop-level 3D printing equipment to enter thousands of households. At the same time, it also puts forward new requirements for 3D printing materials. 1, according to industry standards, from the apparent properties, flow properties, mechanical properties, thermal properties, material safety properties of five aspects, to develop 3D printing materials extrusion molding wire standards to ensure printing accuracy.
Light curing 3D printing technology has become the most widely used 3D printing technology because of its characteristics of high molding accuracy, fast speed, low surface roughness and environmental friendliness. At present, commercial photosensitive resins generally have prominent problems such as poor toughness and low impact strength of cured products, which have become technical problems and industry bottlenecks restricting the development of 3D printing industry.
ETPTA was prepared as a free radical prepolymer, OXA as the active diluent, triarylthionium salt and 1-hydroxy-cycloethyl phenyl ketone as the photoinitiator according to the mass ratio of each component =47∶31.3∶15.7∶3.4∶2.6 in a beaker. The beaker was wrapped with tin foil and stirred for 1h with magnetic force at a rotational speed of 240r/min. Then ultrasound for 0.5h and store in a dark place.
As can be seen: The 3D printing photosensitive resin was prepared with ETPTA as free radical prepolymer, OXA as active thinner, triarylthioonium salt and 1-hydroxy-cycloethyl phenyl ketone as photoinitiator. The viscosity was 320mPa·s, gel rate was 87.08%, volume shrinkage rate was 3.8%, Rock hardness (D) was 85, and tensile strength was 45.28MPa. The tensile elastic modulus is 829.9MPa, the elongation at break is 12.11%, the bending strength is 72.2MPa, the bending elastic modulus is 1740MPa, and the notch impact strength is 5.12kJ/m2, which meets the basic performance requirements of 3D printing photosensitive resin.
If you want to print a model, but there is no light curing 3D printer, we can consider using PLA consumables to complete, it is FDM technology printing model effect is more outstanding and excellent performance of consumables, with good transparency, hardness, chemical resistance, and weather resistance characteristics.
At present, the commonly used 3D printing consumables in the Fused Deposition Modeling technology (FDM) are mainly biodegradable polymers polylactic acid (PLA) and acrylonitrile-butadiene-styrene terpolymer (ABS). As a biodegradable wire,PLA printing wire has good molding effect, lower printing temperature than ABS, and does not produce serious odor, but the domestically developed PLA3D printing wire has poor surface quality and low mechanical properties, which seriously hinder its development in 3D printing technology.
PBS melt flow rate (MFR) is too large, it is difficult to prepare FDM printing wire, but its printing performance is good, and the tensile strength of printed sample is higher than that of injection sample. PBAT is easy to extrude and draw wire to prepare wire, but its wire is soft and requires special FDM equipment to print smoothly, and the printing process parameters have a great impact on the performance of printed samples.
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