Physical Properties And Common Varieties Of Organic Pigments.
Physical properties and common varieties of organic pigments
Organic pigments have bright colors and strong tinting strength; however, some varieties are often inferior to inorganic pigments in light, heat, solvent and migration resistance.
The variety of colors varies endlessly and colorfully, but there is an intrinsic connection between the colors. Each color can be determined by three parameters, namely hue, lightness and saturation. Hue is a feature in which colors are distinguished from each other. It depends on the chromatographic composition of the light source and the sensation of the wavelength emitted by the surface of the object to the human eye, and distinguishes features such as red, yellow, green, blue, and purple. Brightness, also known as brightness, is a characteristic value that indicates the change in the brightness of an object's surface; by comparing the brightness of various colors, the color has a distinction between this and dark. Saturation, also known as chroma, is a characteristic value that indicates the color of the surface of an object, making the color bright and hazy. Hue, lightness, and saturation form a stereo, and with these three scales, we can use numbers to measure color. The colors of nature are ever-changing, but the basic ones are red, yellow and blue, called primary colors.
Common varieties of organic pigments are as follows:
1, azo pigment
A water-insoluble organic compound containing an azo group (-N=N-) in a molecular structure is a type with a large variety and a large yield in an organic pigment.
Water-soluble dyes (such as acid dyes, direct dyes, basic dyes, etc.) are water-insoluble pigments formed by the action of a precipitating agent. Its color is brighter, the chromatogram is more complete, the production cost is lower, and the light fastness is higher than the original water-soluble dye.
3, phthalocyanine pigment
4, quinacridone pigment