Method for preparing ultra-fine cobalt blue pigment under low-temperature

A blue, low-temperature technology, applied in the field of material science, can solve problems such as high crystallization temperature and complex process, and achieve the effects of low preparation cost, cheap and easy-to-obtain raw materials, and simple process and equipment

Inactive Publication Date: 2008-02-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain nano-scale cobalt blue material, the process is quite complicated and the crystallization temperature is high.

Method used

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  • Method for preparing ultra-fine cobalt blue pigment under low-temperature

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: first, three cobalt tetroxide and chromium oxide are pressed by chemical general formula Co 1 Cr 2 o 4 Proportioning is carried out to obtain the reactant, secondly, KOH and NaOH with 100% of the mass of the reactant are added to the reactant and mixed evenly to obtain a mixture; finally, the mixture is calcined at 900° C. for 1 hour, the calcined product is ground, washed, and filtered. Can. It can be seen from Figure 1 that the main crystal phase of the obtained color material is spinel-type cobalt aluminate, and no other impurity phases exist; it can be seen from Figure 2 that the synthetic color material has a small particle size and a small distribution. Between 400nm. The grain development is better and the agglomeration is lighter.

Embodiment 2

[0011] Embodiment 2: at first, tricobalt tetroxide, aluminum hydroxide, zinc oxide and chromium oxide are according to general chemical formula Co 0.5 Zn 0.5 Al 1 Cr 1 o 4 Proportioning is carried out to obtain the reactant, secondly, NaOH and KOH with 150% of the mass of the reactant are added to the reactant and mixed uniformly to obtain a mixture; finally, the mixture is calcined at 800° C. for 2 hours, and the calcined product is ground, washed, and filtered. Can.

Embodiment 3

[0012] Embodiment 3: at first, tricobalt tetroxide, aluminum hydroxide and zinc oxide are according to general chemical formula Co 0.2 Zn 0.8 Al 2 o 4 Proportioning is carried out to obtain the reactant, secondly, KCl with 80% of the mass of the reactant is added to the reactant and mixed uniformly to obtain a mixture; finally, the mixture is calcined at 1000° C. for 1.6 hours, the calcined product is ground, washed and filtered.

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Abstract

A method for preparing superfine cobalt blue colorant at low temperature comprises the following steps: firstly, cobaltosic oxide, aluminium hydroxide, zinc oxide and chromic oxide are mixed according to the general chemical formula of Co1-xZnxAl2-yCryO4 to obtain reactants, wherein x is more than or equal to 0 and is less than 1, while y is more than or equal to 0 and is less than or equal to 2; secondly, one sort or more sorts of KOH, NaOH, KCl, NaCl, Li2SO4 and Na2SO4 are added into the reactants to obtain mixture after being mixed uniformly; finally, the mixture is calcined 1 to 2 hours at the temperature ranging from 800 DEG C to 1,000 DEG C and then the calcined products is under the treatments of grinding, cleaning and filtration. The invention possesses simple technical process and equipment, convenient operation, cheap and easily obtained raw material and low cost for preparing colorant; moreover, the colorant obtained through adopting the preparing method is characterized in high development degree of crystal grain, ideal chromophoric effect of colorant, fine granularity, less agglomeration and good homogeneity etc.; meanwhile, the introduction of salt can lower synthesis temperature.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a method for preparing ultrafine cobalt blue material at low temperature. Background technique [0002] Cobalt blue is an important spinel-type blue pigment, also known as cobalt aluminate blue. The simplest chemical formula is CoAl 2 o 4 , where the cations can be replaced by other metal ions to prepare colorants of different shades or shades. Compared with other blue pigments, it has excellent light resistance, weather resistance, heat resistance, chemical corrosion resistance, non-toxic and other properties, so it is widely used in high temperature resistant coatings, ceramics, enamel, glass, plastic coloring. At present, the methods for preparing the colorant mainly include the traditional solid phase method and some wet chemical methods. Due to the high synthesis temperature of the pigments synthesized by the traditional process, generally above 1200°C, the pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/40C01F7/02
Inventor 杨海波林营王芬朱建锋
Owner SHAANXI UNIV OF SCI & TECH
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