MATERIAL SYSTEM FOR 3D PRINTING

• Main Authors: MISPELKAMP, Dominik, WUNNICKE, Odo, MÜLLER, Andreas, EL AZZAWI, Alexander, BEHRENS, Ulrike, ROCCARO, Maximilian, HOLTHAUSEN, Michael, SCHRIEF, Thomas, POPPE, Dirk, PRIDÖHL, Markus
• Format: Patent
• Language: English; French
• Published: 29.12.2022
• Subjects: ADDITIVE MANUFACTURING TECHNOLOGY; ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; POWDER METALLURGY; SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING CEMENT, CLAY, OR STONE; WORKING METALLIC POWDER; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The present disclosure provides a powder composition for three-dimensional printing, which comprises a first type of polymer particles having a glass transition temperature of less than 80 °C, and a second type of polymer particles having a glass transition temperature of 80 °C or more, the first type of polymer particles and the second type of polymer particles being different from each other and each independently comprising at least one of an initiator, catalyst or accelerator for a free radical polymerization reaction, wherein the powder composition comprises from 1 to 15 wt.% of the first type of polymer particles and from 1 to 25 wt.% of the second type of polymer particles, based on the total weight of the powder composition, and wherein the powder composition further comprises at least one additional type of polymer particles, which differs from the first and second types of polymer particles. Such powder composition enables to prepare articles by 3D printing which have good green body strength and form stability upon curing at elevated temperatures. The final cured three-dimensional articles have mechanical properties, which render them suitable for end use applications. La présente divulgation concerne une composition de poudre pour l'impression tridimensionnelle, qui comprend un premier type de particules polymères ayant une température de transition vitreuse inférieure à 80 °C et un second type de particules polymères ayant une température de transition vitreuse supérieure ou égale à 80 °C, le premier type de particules polymères et le second type de particules polymères étant différents l'un de l'autre et chacun comprenant indépendamment au moins un constituant parmi un initiateur, un catalyseur ou un accélérateur pour une réaction de polymérisation radicalaire, la composition de poudre comprenant entre 1 et 15 % en poids du premier type de particules polymères et entre 1 et 25 % en poids du second type de particules polymères, par rapport au poids total de la composition de poudre et la composition de poudre comprenant en outre au moins un type supplémentaire de particules polymères, qui diffère des premier et second types de particules polymères. Une telle composition de poudre permet de préparer des articles par impression 3D, lesquels présentent une bonne résistance d'ébauche crue et une stabilité de forme lors du durcissement à des températures élevées. Les articles tridimensionnels durcis finaux présentent des propriétés mécaniques qui les rendent appropriés pour des applications d'utilisation finale.