Preparation method of low-wavelength and low-light-transmission type rare earth sulfur-oxygen composite compound

Abstract

The invention discloses a preparation method of a low-wavelength and low-light-transmission type rare earth sulfur-oxygen composite compound. The preparation method includes the following steps: (1) dissolving type-A rare earth salt in water to obtain a type-A rare earth salt solution; (2) dissolving type-B rare earth salt in water to obtain a type-B rare earth salt solution; (3) dissolving a precipitating agent in water to obtain a precipitating agent solution; (4) mixing the type-A rare earth salt solution, the type-B rare earth salt solution and the precipitating agent solution to obtain amixed solution, adjusting the pH value to 2-12, and stirring the mixed solution for precipitation; (5) washing and drying precipitates after filtration; (6) calcinating the precipitates at the temperature of 200-700 DEG C for 30 minutes to 10 hours, and cooling the precipitates to the normal temperature along with a furnace. The rare earth sulfur-oxygen composite compound prepared by the preparation method has high stability and a wide ultraviolet shielding range.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a preparation method of a low-wavelength and low-transmittance rare earth sulfur-oxygen composite compound. Background technique [0002] Ultraviolet rays usually refer to light waves with a wavelength range of 100nm to 400nm. Among them, those with a wavelength of 100nm to 280nm are called UVC, which is the most harmful to the human body, but it will be blocked by the ozone layer when passing through the atmosphere, and only a small amount will Irradiate to the ground; those with a wavelength between 280nm and 315nm are called UVB. Excessive UVB irradiation can cause sunburn on the skin. Also due to the blocking of the ozone layer, the UVB irradiated to the ground is relatively limited; those with a wavelength between 320nm and 400nm It is called UVA, which can also cause damage to human skin, but unlike UVB and UVC, UVA can go directly to the ground thro...

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Problems solved by technology

[0005] Inorganic UV shielding agents are mainly metal oxides, and a small part of ceramic powders; these powders are usually white powders, which not only have high-efficiency shielding ability against UVA, UVB, etc., but also have good permeability to visible light , some inorganic nano-anti-ultraviolet materials also have certain anti-virus and deodorizing effects; metal oxides include zinc oxide (ZnO), cerium oxide (CeO 2 ), titanium dioxide (TiO 2 ), etc., in order to obtain good visible light transmittance, dispersibility and better ultraviolet shielding effect, inorganics are processed into nanoscale and then used; the advantages of inorganic ultraviolet shielding agents are economical, non-toxic, tasteless, irritating It has low resistance and good thermal stability; at present, only two inorganic particles, nano-titanium dioxide and nano-zinc oxide, are allowed to be used as active ingredients in sunscreens; although nano-titanium dioxide and nano-zinc oxide are excellent ultraviolet shielding agents, their disadvantages are that It has strong photocatalytic activity, and it is easy to degrade the contacted matrix material under ultraviolet light, so it needs to be modified or modified to reduce its photocatalytic activity; although inorganic ultraviolet shielding agents have high chemical properties Stability, thermal stability, non-migratory, odorless, non-toxic, non-irritating, but they do not have a good shielding effect on ultraviolet rays above 370nm

[0006] Existing ultraviolet shielding agents cannot meet people's needs for ultraviolet shielding, so it is imminent to develop ultraviolet shielding agents with high stability, non-toxic and harmless, and a wide shielding range

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