POLYMER COMPOSITE MATERIAL WITH PEROVSKITE QUANTUM DOTS, METHOD FOR ITS PREPARATION AND METHOD FOR USE IN 3D PRINTING Russian patent published in 2023 - IPC C08L23/06 C08L23/12 C09K11/08 C09K11/61 C09K11/66 C08K3/16 C08K5/01 C08K5/09 C08K5/17 B29C64/118 B33Y70/00 

FIELD: polymers.

SUBSTANCE: polymer composite material with perovskite quantum dots, a method for its production, and a method for its use in 3D printing. The polymer composite material with perovskite quantum dots contains 400-1400 wt.pts. of polyethylene, 8-14 wt.pts. of stearic or palmitic acid, 4 wt.pts. of octadecylamine, 4-8 wt.pts. of saturated acyclic hydrocarbon from the C₁₆-C₂₀ series and perovskite quantum dots of the composition CsPbX₃, where X = Cl, Br, I, individually or in a mixture, obtained from: 2.0 wt.pts. of cesium carbonate and 1.2 wt.pts. of lead (II) halide from the series PbCl₂, PbBr₂, PbI₂, while the ratio of PbBr₂/PbCl₂ and PbBr₂/PbI₂ is chosen in the range of wt.pts. from 1.2/0 to 0.82/0.38. The method for obtaining a polymer composite material with perovskite quantum dots is that Component-1 is prepared, for which 2.0. wt.pts of cesium carbonate is added from 4 to 8 wt.pts. of stearic or palmitic acid, the mixture is stirred and heated to 150°C in vacuum for 60 minutes until the evolution of gases ceases, after which the flask with the contents is cooled to room temperature under vacuum, the resulting material is crushed to a powder; then prepare Component-2, for which 1.2 wt.pts. of individual lead (II) halide or a mixture of lead halides is added from 4 to 8 wt.pts. of saturated acyclic hydrocarbon from a number of C₁₆-C₂₀ from 4 to 6 wt.pts. of stearic or palmitic acid, and 4 wt.pts. of octadecylamine, the mixture is heated to 125°C under vacuum, maintained at this temperature for 60 minutes, and cooled to room temperature under vacuum; then Component-2 and Component-1 are mixed with polyethylene, for which from 13.2 to 19.2 wt.pts. of the resulting Component-2 and 160 wt.pts. of polyethylene is heated to a temperature of 80°C, the mixture is stirred until homogeneous and cooled to room temperature, then 6 to 10 wt.pts. of crushed Component-1, after which an additional 240 to 1240 wt.pts. of polyethylene and the whole mixture is mixed until homogeneous, a mixture ready for extrusion is obtained; then the resulting mixture of polyethylene /Component-1/Component-2 is loaded into a twin screw extruder and then extruded; the temperature profile in the extruder is maintained from 100°C in the feed zone up to 200°C at the outlet of the extruder; then the composite is formed in the form of a thread-filament with the possibility of further use in 3D printing, the thread-filament leaving the extruder die is cooled with drawing in a water bath, followed by vacuum drying.

EFFECT: obtained composite material has improved uniformity, which increases the mechanical properties of the composite and the quantum yield of photoluminescence of the finished product.

4 cl, 12 dwg, 7 ex