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The color of the pigment The color of the pigment is the result of the selective absorption of light of different wavelengths in the visible light by the pigment, and is affected by physical properties such as crystal shape, particle size and dispersion performance.
For example, the color of iron oxide red varies with its particles The increase in the particle size of the pigment changes from orange-red to purple-red; the color of the pigment is also affected by the light irradiated on it, for example, in the dark, the pigment does not show any color, and the color under strong light is darker than in the dark It looks bright under light, and the same pigment under different light sources (such as sunlight, incandescent light, fluorescence, etc.
) can also show different colors.
Coloring power The coloring power of a pigment refers to the ability of one kind of pigment to show the shade of color when mixed with another kind of pigment.
To adjust the same color, the stronger the tinting power, the less the amount of color paste, the less the water resistance of the color paste and the coating film performance will be affected.
Therefore, the quality of products from different manufacturers may vary greatly in the same color.
The strength of the coloring power of a pigment not only depends on its nature, but also has a certain relationship with its degree of dispersion.
The greater the degree of dispersion, the stronger the coloring power.
The color of light-fast water-resistant pigments will change to varying degrees under the action of light.
The color of inorganic pigments will gradually darken under long-term sunlight, and some pigments will also produce chalking under the action of ultraviolet rays in the sunlight.
Exterior wall coatings should be made of pigments with good light and weather resistance.
Generally, the light resistance is greater than 7-8, and the 8 is the best, and the weather resistance is greater than 4 to 5, and the 5 is the best.
Inorganic pigments, such as iron oxides, generally have very good light resistance, and the corresponding color coatings have good color retention; organic pigments are relatively inferior to inorganic pigments, and the price is much higher.
The higher the light fastness of organic pigments, the higher the price.
For every grade difference in light fastness, the price and weather resistance and color retention will be very different.
When light fastness ≤ 6, and weather resistance ≤ 3, the price difference will be more than 4 times.
Therefore, exterior wall coatings, especially organic color coatings, are paid for at a price.
The ability of the pigment in the coating film to cover the surface of the object to be coated, so that the substrate is covered and can no longer be exposed through the coating film.
The hiding power of a pigment mainly depends on factors such as refractive index, ability to absorb light, crystal structure, and degree of dispersion.
The hiding power of a pigment depends not only on the ability of the coating to reflect light, but also on its ability to absorb light irradiated on the surface of the coating.
For example, carbon black can completely absorb the light shining on it, so its hiding power is extremely strong.
The hiding power of opaque color pigments also depends on their selective absorption of light.
When the pigment is dispersed uniformly in the base material, its particle size will be smaller and the specific surface area will increase, so the hiding power will increase.
However, if the pigment particle size is equal to half of the wavelength of the light, the light will Go through the particles without refraction, and make the particles transparent.
The higher the crystallinity of the pigment, the stronger its hiding power.
The hiding power of mixed pigments cannot be calculated based on the addition rule of the hiding power of each component of the mixture.
In fact, the hiding power of most mixed pigments is larger than the calculated value.
Therefore, mixing the pigments and fillers in an appropriate ratio will not affect their hiding power and help reduce costs.
The covering power of the paint is high, the painted area is high, and the project cost is low.
The hiding power dispersibility and adaptability of commonly used pigments.
The so-called pigment dispersibility refers to the ease of dispersion of the aggregated pigment particles in the paint base and the dispersion state after dispersion.
It is affected by the properties of the pigment and the preparation method.
, Particle size and particle size distribution and other factors.
The dispersibility of the pigment has a significant effect on the hiding power and tinting strength of the pigment, as well as the physical and chemical properties of the coating film.
The adaptability of pigments is particularly important for emulsion architectural coatings.
Due to different types of pigments, the effects of pigments will also show a certain degree of difference, and this tendency of organic pigments is even more obvious.
The pigment is poorly dispersed in the paint, and the matching with the paint is poor, and the paint will have the potential to flocculate or even fade.
The fineness of the color paste is not as fine as possible, because the pigments such as phthalocyanine blue and phthalocyanine green are small-molecule pigments.
The fineness is too small, the particle size difference is large, the dispersion is poor, and it is compatible with the coating.
The performance is not good, the cost of toning is increased, and it can also cause floating colors.
Acid and alkali resistance of acid and alkali resistant pigments is also an important performance index for its use in architectural coatings.
For example, iron blue or chrome yellow will decompose when exposed to alkali, and gray calcium powder and calcium carbonate will react when exposed to acid, so pay attention to selection when using.
If the price is very low, yellow, blue, etc.
produced by non-professional latex paint manufacturers, because the price is very low or the pigment properties are not known, the latex paint will soon have the phenomenon of fading, chalking, etc.
, so the customer chooses paint And latex paint color mixing must pay attention to selection.
For example, the color of iron oxide red varies with its particles The increase in the particle size of the pigment changes from orange-red to purple-red; the color of the pigment is also affected by the light irradiated on it, for example, in the dark, the pigment does not show any color, and the color under strong light is darker than in the dark It looks bright under light, and the same pigment under different light sources (such as sunlight, incandescent light, fluorescence, etc.
) can also show different colors.
Coloring power The coloring power of a pigment refers to the ability of one kind of pigment to show the shade of color when mixed with another kind of pigment.
To adjust the same color, the stronger the tinting power, the less the amount of color paste, the less the water resistance of the color paste and the coating film performance will be affected.
Therefore, the quality of products from different manufacturers may vary greatly in the same color.
The strength of the coloring power of a pigment not only depends on its nature, but also has a certain relationship with its degree of dispersion.
The greater the degree of dispersion, the stronger the coloring power.
The color of light-fast water-resistant pigments will change to varying degrees under the action of light.
The color of inorganic pigments will gradually darken under long-term sunlight, and some pigments will also produce chalking under the action of ultraviolet rays in the sunlight.
Exterior wall coatings should be made of pigments with good light and weather resistance.
Generally, the light resistance is greater than 7-8, and the 8 is the best, and the weather resistance is greater than 4 to 5, and the 5 is the best.
Inorganic pigments, such as iron oxides, generally have very good light resistance, and the corresponding color coatings have good color retention; organic pigments are relatively inferior to inorganic pigments, and the price is much higher.
The higher the light fastness of organic pigments, the higher the price.
For every grade difference in light fastness, the price and weather resistance and color retention will be very different.
When light fastness ≤ 6, and weather resistance ≤ 3, the price difference will be more than 4 times.
Therefore, exterior wall coatings, especially organic color coatings, are paid for at a price.
The ability of the pigment in the coating film to cover the surface of the object to be coated, so that the substrate is covered and can no longer be exposed through the coating film.
The hiding power of a pigment mainly depends on factors such as refractive index, ability to absorb light, crystal structure, and degree of dispersion.
The hiding power of a pigment depends not only on the ability of the coating to reflect light, but also on its ability to absorb light irradiated on the surface of the coating.
For example, carbon black can completely absorb the light shining on it, so its hiding power is extremely strong.
The hiding power of opaque color pigments also depends on their selective absorption of light.
When the pigment is dispersed uniformly in the base material, its particle size will be smaller and the specific surface area will increase, so the hiding power will increase.
However, if the pigment particle size is equal to half of the wavelength of the light, the light will Go through the particles without refraction, and make the particles transparent.
The higher the crystallinity of the pigment, the stronger its hiding power.
The hiding power of mixed pigments cannot be calculated based on the addition rule of the hiding power of each component of the mixture.
In fact, the hiding power of most mixed pigments is larger than the calculated value.
Therefore, mixing the pigments and fillers in an appropriate ratio will not affect their hiding power and help reduce costs.
The covering power of the paint is high, the painted area is high, and the project cost is low.
The hiding power dispersibility and adaptability of commonly used pigments.
The so-called pigment dispersibility refers to the ease of dispersion of the aggregated pigment particles in the paint base and the dispersion state after dispersion.
It is affected by the properties of the pigment and the preparation method.
, Particle size and particle size distribution and other factors.
The dispersibility of the pigment has a significant effect on the hiding power and tinting strength of the pigment, as well as the physical and chemical properties of the coating film.
The adaptability of pigments is particularly important for emulsion architectural coatings.
Due to different types of pigments, the effects of pigments will also show a certain degree of difference, and this tendency of organic pigments is even more obvious.
The pigment is poorly dispersed in the paint, and the matching with the paint is poor, and the paint will have the potential to flocculate or even fade.
The fineness of the color paste is not as fine as possible, because the pigments such as phthalocyanine blue and phthalocyanine green are small-molecule pigments.
The fineness is too small, the particle size difference is large, the dispersion is poor, and it is compatible with the coating.
The performance is not good, the cost of toning is increased, and it can also cause floating colors.
Acid and alkali resistance of acid and alkali resistant pigments is also an important performance index for its use in architectural coatings.
For example, iron blue or chrome yellow will decompose when exposed to alkali, and gray calcium powder and calcium carbonate will react when exposed to acid, so pay attention to selection when using.
If the price is very low, yellow, blue, etc.
produced by non-professional latex paint manufacturers, because the price is very low or the pigment properties are not known, the latex paint will soon have the phenomenon of fading, chalking, etc.
, so the customer chooses paint And latex paint color mixing must pay attention to selection.
