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How to classify and distinguish organic pigments?

Source: 本站 | Release date: 2022-08-18 08:52:42 | View: 553

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Yabang pigments made from colored organic compounds are called organic pigments. A type of pigment made from organic compounds that has color and a series of other pigment characteristics. How can pigments be classified and distinguished based on thei…

Yabang pigments made from colored organic compounds are called organic pigments. A type of pigment made from organic compounds that has color and a series of other pigment characteristics. How can pigments be classified and distinguished based on their characteristics, including sun resistance, water immersion resistance, acid resistance, alkali resistance, and organic resistance? Pigments made from colored organic compounds are called organic pigments. A type of pigment made from organic compounds that has color and a series of other pigment characteristics. The characteristics of pigments include light resistance, water immersion resistance, acid resistance, alkali resistance, organic solvent resistance, heat resistance, crystal stability, dispersibility, and covering power. The difference between organic pigments and dyes lies in their lack of affinity with the colored object. Organic pigments can only be attached to the surface of the object through adhesives or film-forming substances, or mixed inside the object to make it colored. The intermediates, production equipment, and synthesis process required for its production are similar to those of dyes, so organic pigments are often organized and produced in the dye industry. Compared with general inorganic pigments, organic pigments usually have higher coloring power, particles are easy to grind and disperse, are not easy to precipitate, and have brighter colors. However, their sun resistance, heat resistance, and weather resistance are poor. Organic pigments are commonly used for coloring materials such as inks, coatings, rubber products, plastic products, stationery, and building materials.

Classification by structure: (1) Azo pigments account for 59%, (2) Phthalocyanine pigments account for 24%, (3) Triarylmethane pigments account for 8%, (4) Special pigments account for 6%, (5) Polycyclic pigments account for 3%

Organic pigments have bright colors and strong coloring power; Low density and non-toxic, but some varieties are often less resistant to light, heat, solvents, and migration than inorganic pigments. The variety of colors varies endlessly and is colorful, but there is a certain internal connection between various colors. Each color can be determined by three parameters, namely hue, brightness, and saturation.

Hue is a characteristic that distinguishes colors from each other, determined by the chromatographic composition of the light source and the sensation of the various wavelengths emitted by the object surface on the human eye. It can distinguish features such as red, yellow, green, blue, and purple. Brightness, also known as brightness, is a characteristic value that represents the variation in the brightness of an object's surface; By comparing the brightness of various colors, there is a distinction between bright and dark colors.

Saturation, also known as chromaticity, is a characteristic value that represents the intensity of the surface color of an object, distinguishing between bright and dark colors.

Hue, brightness, and saturation form a solid, and using these three to establish a scale, we can measure color using numbers. The colors in nature are ever-changing, but the basic colors are red, yellow, and blue, which are called primary colors.


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