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

A technology of compound and rare earth chloride salt, which is applied in the field of preparation of low-wavelength and low-transmittance rare-earth sulfur-oxygen complex compounds, can solve the problem of not having a good shielding effect on ultraviolet rays, and achieve good shielding effect, high stability, and wide shielding range Effect

Active Publication Date: 2019-04-05
NORTHEASTERN UNIV
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  • Abstract
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  • Claims
  • Application Information

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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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A class rare earth salt is dissolved in water to make a class A rare earth salt solution; the A class rare earth salt is a class A rare earth chloride salt; the A class rare earth chloride salt is lanthanum chloride; the concentration of the rare earth in the A class rare earth salt solution is 0.2M;

[0033] Dissolving Class B rare earth salt in water to prepare Class B rare earth salt solution; Class B rare earth salt is an equal mass mixture of Class B rare earth chloride salt and Class B rare earth nitrate; Class B rare earth chloride salt is samarium chloride; The rare earth nitrate is terbium nitrate; the rare earth concentration in the B rare earth salt solution is 0.8M;

[0034] The precipitant is dissolved in water to make a precipitant solution; the precipitant is sodium thiosulfate; the concentration of the precipitant in the precipitant solution is 0.2M;

[0035] Mix the Class A rare earth salt solution, the Class B rare earth salt solution and the precipit...

Embodiment 2

[0039] Method is with embodiment 1, and difference is:

[0040] (1) Class A rare earth chloride salt is cerium chloride; the concentration of rare earth in the class A rare earth salt solution is 0.4M;

[0041] (2) Class B rare earth salt is an equal mass mixture of Class B rare earth nitrate and Class B rare earth sulfate; Class B rare earth nitrate is an equal mass mixture of samarium nitrate and terbium nitrate; said Class B rare earth sulfate is sulfuric acid An equal mass mixture of samarium and terbium sulfate; the concentration of the rare earth in the type B rare earth salt solution is 0.2M;

[0042] (3) Precipitant is ammonium sulfide; The concentration of precipitant in the precipitant solution is 0.6M;

[0043] (4) The molar ratio of class A rare earth salt, class B rare earth salt and precipitant in the mixed solution is 1:0.05:0.05; adjust the pH value to 3, and stir at 90°C for 10 minutes;

[0044] (5) Roasting at 200°C for 10 hours; the composition of the low-...

Embodiment 3

[0046] (1) Class A rare earth chloride salt is praseodymium chloride; the concentration of rare earth in the class A rare earth salt solution is 0.5M;

[0047] (2) Class B rare earth salt is an equal mass mixture of Class B rare earth chloride salt, Class B rare earth nitrate and Class B rare earth sulfate; Class B rare earth chloride salt is yttrium chloride; Class B rare earth nitrate is europium nitrate ; Class B rare earth sulfate is samarium sulfate; the concentration of rare earth in Class B rare earth salt solution is 0.9M;

[0048] (3) Precipitant is sodium sulfide; The concentration of precipitant in the precipitant solution is 1M;

[0049] (4) The molar ratio of the class A rare earth salt, the class B rare earth salt and the precipitating agent in the mixed solution is 1:20:20; adjust the pH value to 4, and stir at 30°C for 6 hours;

[0050] (5) Roasting at 600°C for 1h; the composition of the low-wavelength and low-transmittance rare earth sulfur-oxygen complex co...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
CPCC01F17/294
Inventor 边雪李艳平吴文远
Owner NORTHEASTERN UNIV
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