Preparation method of low-wavelength and low-transparency rare earth sulfur-oxygen composite compound

Abstract

A method for preparing a low-wavelength, low-transmittance rare earth sulfur-oxygen composite compound, which includes the following steps: (1) Dissolving type A rare earth salts in water to prepare a type A rare earth salt solution; (2) Dissolving type B rare earth salts in Make a Class B rare earth salt solution in water; (3) Dissolve the precipitant in water to make a precipitant solution; (4) Mix the Class A rare earth salt solution, the Class B rare earth salt solution and the precipitant solution to make a mixed solution; Adjust the pH value to 2 to 12, and then precipitate under stirring; (5) Filter and wash with water and dry; (6) Roast at 200 to 700°C for 30 minutes to 10 hours, and then cool to normal temperature in the furnace. The rare earth sulfur-oxygen composite compound prepared by the method of the invention has high stability, and the product has a wide ultraviolet shielding range.

Description

Technical field [0001] The present invention belongs to the field of inorganic material, and more particularly to a method for preparing low-wavelength low light transmissive rare earth sulfur oxygen composite compounds. Background technique [0002] Ultraviolet rays generally refer to the wavelength range between 100 nm to 400 nm, wherein the wavelength is called UVC between 100 nm to 280 nm, which is the most harmful to the human body, but through the atmosphere, it will be blocked by the ozone layer, only a small amount Illuminate the ground; the wavelength is called UVB between 280 nm ~ 315 nm, and the excess UVB irradiation can cause skin into the skin, and the UVB irradiated to the ground is limited due to the barrier of the ozone layer; the wavelength is between 320 nm to 400 nm. It is known as UVA, which also causes damage to the human skin, but different from UVB and UVC, UVA can be directly grounded through the atmosphere, so it is currently desirable for ultraviolet ca...

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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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