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First, the definition of organic pigments

Organic pigments are colored organic matter, but not all colored materials can be used as organic pigments. To make colored materials a pigment, they must have the following properties:

Bright, able to give the color (or substrate) firm color; insoluble with water, organic solvents or application of the media; easy to evenly dispersed in the application of the media and throughout the dispersion process without the physical and chemical effects of the media , To retain their own inherent crystal structure; light fastness, weather resistance, heat resistance, acid and alkali resistance and organic solvents. The same time as

Second, organic pigments and dyes similarities and differences

Organic pigments and dyes are colored organic compounds, from the organic pigment and dye chemical structure, the two are very similar, and even some organic compounds can be used as a dye can also be used as organic pigments, but organic pigments and dyes do Are two different concepts, the difference between them is mainly application performance is different. The traditional use of dyes is the dyeing of textiles, while the traditional use of pigments is to non-textiles (such as: ink, paint, paint, plastic, rubber, etc.) coloring. This is because the dye on the textile affinity (or direct), can be fiber molecules adsorption, fixation; and the pigment on all the coloring objects are no affinity, mainly by resin, adhesives and other film-forming substances and coloring objects Together. Dye in the course of the general use of the first dissolved in the use of media, even the disperse dyes or vat dyes in the dyeing also experienced a crystal state from the first dissolved in water into a molecular state and then dyed on the fiber on the process. Therefore, the color of the dye itself does not represent its color on the fabric. Pigment in the use of the process, because it is insoluble in the use of media, so always the original crystal state exists. Thus, the color of the pigment itself represents its color in the substrate. Because of this, the crystal state of the pigment is important for the pigment, and the crystal state of the dye is less important, or the crystal state of the dye itself is not closely related to its dyeing behavior.

Pigments and dyes are different concepts, but in specific cases, they can be generic. Such as certain anthraquinone reducing dyes, which are insoluble dyes, but can also be used as pigments after pigmenting. Such dyes, known as pigment dyes, or dye pigments.

Third, organic paint and inorganic pigments similarities and differences

In recent years, the development of organic pigments is extremely rapid, because organic pigments have many unique advantages over inorganic pigments. Organic pigments by changing the molecular structure, you can prepare a wide variety, but also more than inorganic pigments more bright colors, more bright colors. Organic pigments also have much higher color strength than inorganic pigments, can be prepared with high tinting strength, high transparency of the varieties to meet the requirements of high-grade paint and printing ink. Most organic pigments are less toxic, and most inorganic pigments contain heavy metals such as chrome, red, and red. Low-grade organic pigments are inferior to inorganic pigments in light fastness, weather fastness, heat resistance and solvent resistance, but some high-grade organic pigments (such as quinacridone pigments, phthalocyanine Pigments, etc.) have excellent light fastness, weather fastness, heat resistance and solvent resistance, and their acid / alkali performance is better than inorganic pigments, because some inorganic pigments acid / alkali performance is poor, Such as: chrome yellow case of hydrogen sulfide will turn black, the case will turn red; group Qing easily acid decomposition. Organic pigments varieties, types, production and application are growing and expanding, has become a class of important fine chemical products.

Fourth, a brief history of the development of organic pigments

Human use of paint, has a long history. Archaeologists have found that humans have begun to use colored inorganic matter 30,000 years ago, such as the use of Hercules and Hematite as a "color material" for painting purposes, which can be made from ancient frescoes , Rock paintings are proven. This is used as a "color material" of He Shi, hematite, in fact, is the most primitive inorganic pigments.

When the use of organic pigments from when, it is difficult to determine the exact age, because the ancient organic pigments are easy to fade, it is difficult to retain so far. In ancient times, as a supplement to inorganic colors, humans used botanical coloring materials (such as madder, indigo) or animal color (such as Tyler, from a conch). Since the colorants were extracted from the flora and fauna, the biologists called them Pigment, the word of today's pigments. The word Pigment comes from the Latin Pigmentum, which is the pigment extracted from the roots of a plant called Pingere. Modern scientific research shows that the colored components of madder are mainly alizarin (1,2-dihydroxyanthraquinone), and the colored component of indigo is mainly indigo (Indigo). These two substances or their derivatives are still used as pigments. Of course, from today's point of view, these organic materials are soluble, they should be classified as dyes rather than organic pigments, but at least they are the origin of modern organic pigments.

By the middle of the nineteenth century, the large-scale synthesis of synthetic dyes, which also laid the foundation for the synthesis of organic pigments. Organic pigments are accompanied by the development of the dye industry and gradually developed.

In 1856, the British chemist Perkin prepared the first synthetic dye, that is, aniline violet (Mauveine); 1858, the German chemist Griess discovered the aniline diazotization reaction, in 1861 Mene found an aniline diazonium salt and aromatic amine Or aromatic phenolic coupling reaction, began to synthetic dyes and organic pigments.

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