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 the problems of complex process and high crystallization temperature, and achieve the effects of low preparation cost, lower synthesis temperature and convenient operation

Inactive Publication Date: 2009-12-16
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
  • Method for preparing ultra-fine cobalt blue pigment under low-temperature

Examples

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. Depend on figure 1 It can be seen that the main crystal phase of the obtained pigment is spinel cobalt aluminate, and no other impurity phases exist; by figure 2 It can be seen that the particle size of the synthetic colorant is small and the distribution is small, between 200-400nm. 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 ultra-fine cobalt blue material at low temperature. First, three cobalt tetroxide, aluminum hydroxide, zinc oxide and chromium oxide are mixed according to the general chemical formula Co1-xZnxAl2-yCryO4 to obtain reactants, wherein 0≤x<1, 0≤y≤2; secondly, add one or more of KOH, NaOH, KCl, NaCl, Li2SO4, Na2SO4 to the reactant and mix evenly to obtain a mixture; finally, calcinate the mixture at 800°C-1000°C for 1 -2 hours, grind the calcined product finely, wash and filter. The technical process and equipment of the invention are simple, easy to operate, cheap and easy to obtain raw materials, and low cost of colorant preparation. The pigment obtained by the preparation method of the present invention has the characteristics of good grain development, good color development, fine particle size, light agglomeration, good uniformity, etc., and at the same time, the introduction of salt can reduce the 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 Patents(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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