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Preparation method of anti-counterfeiting cobalt blue pigment with infrared reflectance function and fluorescence emission function

A technology of fluorescence emission and infrared reflection, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of incomplete product crystallization, high process requirements, low reaction temperature, etc., achieve lower calcination temperature and simple preparation process , the effect of low sintering temperature

Inactive Publication Date: 2015-09-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that it is simple and convenient, but the disadvantage is that it is difficult to mix the raw materials evenly, resulting in incomplete crystallization of the product, performance degradation, and the waste of energy due to high calcination temperature is also serious; the second is the liquid phase method, that is, the hydrothermal method. Soluble raw materials, react in a hydrothermal kettle at 200-300°C
The advantage of this method is that the reaction temperature is low and the particle size distribution of the product is small, but the disadvantage is that the reaction time is too long, the process requirements are high, and the post-treatment is also difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) synthesis

[0015] Add cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O), aluminum nitrate nonahydrate (Al(NO 3 ) 3 9H 2 O), glycine (C 2 h 5 NO 2 ) and water (H 2 (0), heating to 50° C. and keeping stirring for 0.5 h to completely dissolve the solid to obtain a dark red homogeneous solution, continue to heat up to 150° C. for 0.5 h, and obtain a gray powder solid after the solvent is completely removed;

[0016] 2) heat treatment

[0017] The gray powder solid was placed in a high-temperature furnace in an air atmosphere, treated at 600 °C for 0.5 h, and naturally cooled to room temperature to obtain blue powder CoAl 2 o 4 ;

[0018] 3) Post-processing

[0019] Use hydrochloric acid with a mass concentration of 10%, pickle for 1 h, then wash with water until neutral, and obtain blue cobalt blue powder after dehydration and drying.

[0020] The solid particles of the cobalt blue pigment prepared in this embodiment show complete infrared reflection and no infr...

Embodiment 2

[0022] 1) synthesis

[0023] Add cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O), aluminum nitrate nonahydrate (Al(NO 3 ) 3 9H 2 O), glycine (C 2 h 5 NO 2 ) and water (H 2 (0), heating to 90° C. and keeping stirring for 2 h to completely dissolve the solid to obtain a dark red homogeneous solution, continue to heat up to 200° C. for 2 h, and obtain a gray powder solid after the solvent is completely removed;

[0024] 2) heat treatment

[0025] The gray powder solid was placed in a high-temperature furnace, treated in an air atmosphere at 900 °C for 3 h, and naturally cooled to room temperature to obtain blue powder CoAl 2 o 4 ;

[0026] 3) Post-processing

[0027] Use hydrochloric acid with a mass concentration of 10%, pickle for 1.5 h, then wash with water until neutral, and obtain blue cobalt blue powder after dehydration and drying.

[0028] The solid particles of the cobalt blue pigment prepared in this embodiment show complete infrared reflection and no infrared...

Embodiment 3

[0030] 1) synthesis

[0031] Add cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O), aluminum nitrate nonahydrate (Al(NO 3 ) 3 9H 2 O), glycine (C 2 h 5 NO 2 ) and water (H 2 (0), heating to 60° C. and keeping stirring for 1 h to completely dissolve the solid to obtain a dark red homogeneous solution, continue to heat up to 170° C. for 1 h, and obtain a gray powder solid after the solvent is completely removed;

[0032] 2) heat treatment

[0033] Put the gray powder solid in a high-temperature furnace in an air atmosphere, treat it at 800 °C for 2 h, and cool it to room temperature naturally to obtain a blue powder CoAl 2 o 4 ;

[0034] 3) Post-processing

[0035] Hydrochloric acid with a mass concentration of 10% was used to pickle for 2 h and then washed to neutrality, and the blue cobalt blue powder was obtained after dehydration and drying.

[0036] The solid particles of the cobalt blue pigment prepared in this embodiment show complete infrared reflection and no in...

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Abstract

The invention relates to a preparation method of an anti-counterfeiting cobalt blue pigment with an infrared reflectance function and a fluorescence emission function. A molecular formula of a blue material is CoAl2O4; and the structural composition is CoO.Al2O3. According to the method, a soluble raw material firstly reacts in a solution, is mixed evenly at a molecular level, and is burnt to obtain a product; meanwhile, a redox assistant is added to reduce the burning temperature and reduce energy consumption; and finally, the cobalt blue pigment with non-infrared absorption characteristic and fluorescence emission is finally synthesized. Compared with the prior art, the anti-counterfeiting cobalt blue pigment has the advantages that the anti-counterfeiting cobalt blue pigment is simple in preparation technology and low in burning temperature; and the pigment has no absorption in a near infrared region, has fluorescence emission in an ultraviolet region, and also has application value as an anti-counterfeiting pigment.

Description

technical field [0001] The invention relates to a preparation method of an anti-counterfeit cobalt blue pigment, in particular to a preparation method of an anti-counterfeit cobalt blue pigment with functions of infrared reflection and fluorescence emission. Background technique [0002] Whether anti-counterfeiting technology is in the scope of people's daily life or in the field of high-end technology, its application is very extensive and necessary. With the advancement of technology, anti-counterfeiting methods also have various forms, such as printing anti-counterfeiting, chemical material anti-counterfeiting, physical anti-counterfeiting, structure and packaging anti-counterfeiting, etc. In the field of printing anti-counterfeiting, anti-counterfeiting additives are an important anti-counterfeiting means. This anti-counterfeiting technology is characterized by simple implementation, low cost, good concealment, bright colors, convenient inspection, and strong reproducib...

Claims

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Application Information

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IPC IPC(8): C01G51/00
Inventor 贺英曹雨王鑫楠吴孙奏刘为成王均安
Owner SHANGHAI UNIV
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