Identification and Classification of Organic Pigments

Pigments made from colored organic compounds are called organic pigments ORGANIGPIGMENT. Refers to a class of pigments made from organic compounds that have a color and a range of other pigment properties. The pigment properties include light resistance, water resistance, acid resistance, alkali resistance, organic solvent resistance, heat resistance, crystal stability, dispersibility and hiding power. The difference between an organic pigment and a dye is that it has no affinity with the object to be colored, and only the organic pigment is attached to the surface of the object through an adhesive or a film-forming substance, or mixed inside the object to color the object. The intermediates, production equipment, and synthesis processes required for its production are all very similar to the production of dyes, so organic pigments are often organized and produced in the dye industry. Compared with general inorganic pigments, organic pigments generally have higher coloring power, particles are easy to grind and disperse, are less likely to precipitate, and are more vivid in color, but have poor light, heat, and weather resistance. Organic pigments are commonly used for the coloration of materials such as inks, coatings, rubber products, plastic products, culture and education supplies, and construction materials.

Classified by structure:

(1) Azo pigments account for 59%

(2) 24% phthalocyanine pigment

(3) Triarylmethane Pigments 8%

(4) Special pigments account for 6%

(5) Polycyclic Pigments account for 3%

The organic pigments have bright colors, strong coloring power, low density and no toxicity, but some of the varieties are not as good as inorganic pigments in terms of light resistance, heat resistance, solvent resistance and migration resistance. The variety of colors varies endlessly and colorfully, but there is a certain amount of intrinsic link between each color. Each color can be determined with three parameters, namely hue, lightness, and saturation.

Hue is a feature in which colors are distinguished from each other. It is determined by the chromatographic composition of the light source and the sensation of each wavelength emitted by the object surface to the human eye, which can distinguish red, yellow, green, blue, and purple. Brightness, also known as brightness, is the characteristic value that represents the change in lightness and darkness of an object's surface; by comparing the brightness of various colors, the color has a bright and dark distinction.

Saturation, also known as saturation, is the characteristic value that represents the color of the surface of the object, making the color bright and hazy.

Hue, lightness, and saturation form a three-dimensional scale. Using these three scales, we can use color to measure color. The colors of the natural world are ever-changing, but the most basic ones are red, yellow, and blue, which are called primary colors.