Pigment Blue 28 CAS 1345-16-0

Chemical Property:

Molecular Formula	CoO·Al2O3
Density	4.26[at 20℃]
Physical and Chemical Properties	The main composition of cobalt blue is CoO, Al2O3, or cobalt aluminate [CoAl2O4], according to the chemical formula theory, Al2O3 content is 57.63%, CoO content is 42.36%, or Co content is 33.31%, but the actual composition of cobalt blue pigment Al2O3 in 65% ~ 70%, CoO between 30% ~ 35%, some cobalt blue pigment containing cobalt oxide content is lower by one or one and a half, because it is also possible to contain small amounts of oxides of other elements, such as Ti, Li, Cr, Fe, Sn, Mg, Zn, etc. As the analysis of a cobalt blue pigment species shows that its CoO is 34%, Al2O3 is 62%,ZnO is 2% and P2O5 is 2%. It is also possible for cobalt blue to contain small amounts of alumina, Cobalt green (CoO · ZnO) and cobalt violet [Co2(PO4)2] In addition to the main composition to change the hue of the cobalt blue pigment. This kind of pigment belongs to the spinel class, is a cube with spinel crystallization. The relative density is 3.8~4.54, the hiding power is very weak, only 75~80g/m2, the oil absorption is 31% ~ 37%, the specific volume is 630 ~ 740g/L, the quality of cobalt blue produced in modern times is essentially different from that of early products. Cobalt blue pigment has a bright color, excellent weather resistance, alkali resistance, resistance to various solvents, heat resistance up to 1200. The main weak poof is less than the color strength of phthalocyanine blue pigment, because it is calcined at high temperature, although after grinding, but the particles still have a certain hardness.
Use	cobalt blue is a non-toxic pigment. Cobalt blue pigment is mainly used for high temperature resistant coatings, ceramics, enamel, Glass coloring, high temperature resistant engineering plastic coloring, and as an art pigment. The price is more expensive than the general inorganic pigment, the main reason is the higher price of cobalt compounds. The varieties of ceramic and enamel coloring are quite different from those of plastics and coatings.

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Introduction

Quality:

1. Cobalt blue is a dark blue compound.

2. It has good heat resistance and light resistance, and can maintain the stability of its color at high temperatures.

3. Soluble in acid, but insoluble in water and alkali.

Use:

1. Cobalt blue is widely used in ceramics, glass, glass and other industrial fields.

2. It can maintain color stability at high temperatures, and is often used for porcelain decoration and painting.

3. In glass manufacturing, cobalt blue is also used as a colorant, which can give the glass a deep blue color and increase its aesthetics.

Method:

There are many ways to make cobalt blue. The most commonly used method is to react cobalt and aluminum salts at a certain molar ratio to form CoAl2O4. Cobalt blue can also be prepared by solid-phase synthesis, sol-gel method and other methods.

Safety Information:

1. Inhalation of dust and solution of the compound should be avoided.

2. When coming into contact with cobalt blue, you should wear protective gloves and eye protection devices to prevent skin and eye contact.

3. It is also not suitable to contact the fire source and high temperature for a long time to prevent it from decomposing and producing harmful substances.

4. When using and storing, pay attention to the relevant safety operation procedures.

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