关键词: 海藻酸钠纤维, 长余辉发光材料, 长余辉海藻酸钠纤维, 余辉性能, 力学性能

Abstract: As the concept of green environmental protection continues to be deeply rooted in people's minds, long afterglow luminescent materials, as a kind of green energy-saving environmental protection materials, have gradually attracted  widespread attention from researchers. At the same time, most of the studies on the application of long afterglow luminescent materials in the textile field are aluminate long afterglow luminescent materials, and there is relatively little research on the application of silicate long afterglow luminescent materials. In addition, silicate long afterglow luminescent materials have excellent water resistance compared with aluminate materials, so there is no need for coupling modification before incorporating them into the spinning solution, which can reduce the process of preparing long afterglow fibers with afterglow properties.
To prepare sodium alginate fibers with afterglow properties, a series of sodium alginate spinning solutions with mass gradients (1.5%, 2.0% and 2.5%) doped with Sr2MgSi2O7:Eu2+,Dy3+ long afterglow luminescent materials were set up, and a series of long afterglow sodium alginate fibers with different mass fractions of long afterglow luminescent materials were prepared by wet spinning. The surface microstructure, chemical structure, afterglow properties and mechanical properties of sodium alginate fibers and sodium alginate fibers were tested and analyzed by field emission scanning electron microscope, Fourier infrared instrument, fluorescence spectrometer, fluorescence brightness tester and tension meter, and the best doping quality of Sr2MgSi2O7:Eu2+,Dy3+ long afterglow luminescent material was explored. It provides a theoretical basis for determining the doping quality of Sr2MgSi2O7:Eu2+,Dy3+ long afterglow luminescent materials in other kinds of fiber spinning solution. The results show that the surface of sodium alginate fiber changes from being smooth to being rough and its cross section shape changes from being round to being sawtooth after the addition of Sr2MgSi2O7:Eu2+,Dy3+ long afterglow luminescent material. At the same time, as the Sr2MgSi2O7:Eu2+,Dy3+ long afterglow luminescent material is successfully incorporated into the sodium alginate fiber, the sodium alginate fiber has the afterglow performance, and has a wide and strong emission peak in its emission spectrum, which is attributed to the characteristic emission peak of Sr2MgSi2O7:Eu2+,Dy3+ long afterglow sodium alginate. In addition, the mechanical properties of sodium alginate fiber decrease due to the addition of Sr2MgSi2O7:Eu2+,Dy3+ long afterglow luminescent materials. All the experimental results show that when the mass fraction of sodium alginate is 4% and the mass fraction of Sr2MgSi2O7:Eu2+,Dy3+ is 2%, the prepared sodium alginate fiber not only has good surface morphology and mechanical properties, but also has good afterglow properties.
In this paper, a series of long afterglow sodium alginate fibers with different mass fractions were prepared by wet spinning and their properties were characterized. The influence of doping different mass fractions of Sr2MgSi2O7:Eu2+,Dy3+ afterglow luminescent materials on the properties of sodium alginate fibers was studied. The optimal doping concentration of Sr2MgSi2O7:Eu2+,Dy3+ long afterglow luminescent material was determined, providing a theoretical basis for the incorporation of other kinds of spinning fluids into the material. At the same time, the prepared long afterglow sodium alginate fiber has good afterglow performance and excellent mechanical properties, and can be used in night clothing, stage decoration and anti-counterfeiting signs and other applications.

Key words: sodium alginate fiber, long afterglow luminescent materials, long afterglow sodium alginate fiber, afterglow property, mechanical property