Preparation And Properties Of Blue Luminescent 3D Printing Composites

Acrylonitrile-butadiene-styrene（ABS）and high-impact polystyrene（HIPS）have become commonly used materials for 3D printing technology due to their excellent thermal stability,good rigidity and high mechanical strength,etc.The 3D printing materials are colorful,but their lack of luminescence in a dark environment restricts their application in fluorescent detection such as identity recognition.With stable chemical properties,excellent luminescence intensity and long afterglow time,rare earth luminescent materials have been widely used in traffic signs,optical tracking,biological imaging,anti-counterfeiting and architectural decoration.However,previous studies on 3D printing consumables have focused on the improvement and analysis of mechanical properties,and the introduction of long afterglow phosphors in ABS and HIPS to produce 3D printed luminescent materials is not common.The addition of inorganic luminescent fillers to achieve luminescent properties of composites can expand the application areas of polymers.In this paper,a series of composites with sustained luminescence capability were prepared by using long afterglow phosphors as fillers and compounding them with ABS and HIPS matrix.The main research contents and results are as follows:1.Sr₂Mg Si₂O₇:Eu²⁺,Dy³⁺（SMSED）phosphor was synthesized by high-temperature solid-phase（HTS）and sol-gel（Sol-gel）methods,and the blue light emitted was produced by the jump of the excited state electrons（4f⁶5d¹）of Eu²⁺ions to the ground state（4f⁷）,and the excitation spectrum showed an asymmetric broad band under the monitoring of 465 nm wavelength,with a peak at397 nm.The peak appeared at 397 nm.The structure of the SMS was refined using the Rietveld method,and the diffraction peaks corresponded to the crystallographic coordinates with a single-phase sample in the matrix.Calculations of the energy band structure,Brillouin zone and density of states were performed using the CASTEP module,demonstrating that SMS is a good substrate for the study of luminescent materials.By comparison,the Sol-gel synthesized phosphor has smaller particle size and longer afterglow time.2.ABS has high mechanical strength,good"tough,tough,rigid"comprehensive performance,the use of silane coupling agent KH550 and peptide condensation reagent 2-（7-azabenzotriazole）-N,N,N’,N’-tetramethyluronium hexafluorophosphate（HATU）SMSED and ABS modified grafting,the synthesis of spontaneous SMSED/ABS composites with blue light.The brightness and duration of the composites could still be clearly observed under the excitation of 254 nm UV light.The maximum tensile load and elastic modulus of the composites showed an increasing trend with the increase of the grafted phosphor incorporation content,and the optical and mechanical properties showed the same trend,which promoted the practical application of 3D printing technology to some extent.3.HIPS is characterized by easy processing,dimensional stability and high impact strength.Self-emitting blue SMSED/HIPS composites were synthesized using KH550 modified phosphor,acetonitrile as solvent,anhydrous potassium carbonate and tetraethylammonium iodide as catalyst.The fluorescence spectra and afterglow times showed that the composite showed a gradual increase with the incorporation of the grafted phosphor.The mechanical properties tests indicated that the grafted phosphor could improve the interfacial repulsion of different substances compared with the untreated phosphor,and the maximum tensile load and elastic modulus of the composite filament showed a trend of first increase and then decrease with the increase of the grafted phosphor content,and the mechanical properties were optimal when 2 wt%of the grafted phosphor was incorporated.The mechanical properties reached the optimum.