Preparation method of rare-earth colorant

A colorant and rare earth technology, applied in the field of preparation of rare earth colorants, can solve problems such as unfavorable safe production, and achieve the effects of low cost, easy industrial production and safe production.

Active Publication Date: 2011-07-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] But, in the preparation method of the rare earth sulfide coloring agent of above-mentioned report, all used dangerous, toxic gases such as hydrogen, hydrogen sulfide or carbon disulfide, therefore, be unfavorable for safe production

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  • Preparation method of rare-earth colorant
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  • Preparation method of rare-earth colorant

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preparation example Construction

[0028] The invention discloses a preparation method of a rare earth colorant, comprising:

[0029] The rare earth coloring agent is obtained by reacting rare earth compound, sulfur and solid carbon in a closed reactor at 1000-1500 DEG C, and the rare earth compound is rare earth carbonate or rare earth oxide.

[0030] In the present invention, the rare earth carbonate is preferably cerium carbonate, lanthanum carbonate or praseodymium carbonate, and the rare earth oxide is preferably ceria, lanthanum trioxide or praseodymium trioxide.

[0031] The present invention uses sulfur and solid carbon as vulcanizing agents, and the sulfur and solid carbon react at high temperature to generate carbon disulfide, and its chemical reaction formula is as follows:

[0032] C+S→CS 2 (carbon disulfide)

[0033] The carbon disulfide produced by the sulfur and solid carbon reacts with the rare earth carbonate or rare earth oxide to form rare earth sulfide. The solid carbon used in the presen...

Embodiment 1

[0043]0.375 moles of sublimated sulfur, 0.25 moles of cerium oxide, 0.00375 moles of anhydrous sodium carbonate, and 12.5 moles of graphite were reacted in a closed crucible at 1000° C. for 5 hours to obtain a reaction product;

[0044] The reaction product is ground, washed with water, and dried to obtain the red rare earth colorant Ce 2 S 3 .

[0045] The chromaticity coordinates of the rare earth colorant prepared in this embodiment are (L*=38, a*=55, b*=40), and the X-ray diffraction spectrum of the rare earth colorant is as follows: figure 1 As shown, the diffuse reflectance spectrum as figure 2 shown.

Embodiment 2

[0047] React 1 mole of sublimed sulfur, 0.25 moles of ceria, 0.075 moles of anhydrous sodium carbonate, and 0.75 moles of graphite in a closed crucible at 1200°C for 1 hour to obtain a reaction product;

[0048] The reaction product is ground, washed with water, and dried to obtain the red rare earth colorant Ce 2 S 3 .

[0049] The chromaticity coordinates of the rare earth colorant prepared in this example are (L*=38, a*=55, b*=40).

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Abstract

The embodiment of the invention discloses a preparation method of a rare-earth colorant, comprising the step of subjecting a rare-earth compound, sulphur and solid carbon to reaction in an airtight reactor at 1,000-1,500 DEG C to obtain the rare-earth colorant, wherein the rare-earth compound is rare-earth carbonate or a rare-earth oxide. In the invention, two solid substances of the sulphur and the solid carbon are vulcanizing agent, the sulphur and the solid carbon react at high temperature to generate carbon disulfide, and then the carbon disulfide reacts with the rare-earth carbonate or the rare-earth oxide in an airtight system to generate rare-earth sulfides. Therefore, no hydrogen, hydrogen sulfide or carbon disulfide and other dangerous and toxic gasses are used in the invention to prepare the rare-earth colorant. The preparation method provided by the invention has the characteristics of safety and reliability for production. Meanwhile, because the reaction between the sulphur and the solid carbon is the solid-solid reaction, the preparation method provided by the invention is easy to realize industrial production and has high yield and low cost.

Description

technical field [0001] The invention relates to the technical field of colorants, more specifically, to a preparation method of rare earth colorants. Background technique [0002] Heavy metal-based inorganic pigments have been commonly used colorants for many years. However, heavy metal-based inorganic pigments are very harmful to the environment and human health. [0003] In order to avoid the harm of heavy metals in heavy metal-based inorganic pigments to human beings, producers and users of colorants have been working hard to develop new colorants. The fourth issue of "RIC News" in 1996 released the red and orange rare earth sulfide colorants developed by the French Rhone Planck Company, which can replace heavy metal-based inorganic pigments for coloring plastics. The rare earth sulfide colorants have Good thermal stability, light fastness, opacity, hiding power and dispersibility have aroused great interest. [0004] At present, the preparation method of various rare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 张洪杰庞然邓瑞平李成宇
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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