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Organic Pigments Are Colored Organic Matter

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 colors, can be given to the coloring (or substrate) firm color;

Insoluble with water, organic solvents or application media;

Are easily dispersed in the application medium and are free from the physical and chemical effects of the application medium throughout the dispersion process, retaining their inherent crystal structures;

Light resistance, weather resistance, heat resistance, acid and alkali resistance and organic solvents.

The similarities and differences between organic pigments and dyes

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 Is the difference between 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 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. Therefore, 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 are also pigmented after being pigmented. Such dyes, known as pigment dyes, or dyestuffs.

The Similarities and Differences of Organic Pigments and Inorganic Pigments

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 has a more vivid colors than inorganic pigments, 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 yellow, reddish, and red. Low-grade organic pigment varieties in the light fastness, weather fastness, heat resistance and solvent resistance and other aspects of inferior to inorganic pigments, but some high-grade organic pigment varieties (such as: quinacridone pigment, phthalocyanine Pigments, etc.) have excellent fastness to light, weather fastness, heat resistance and solvent resistance, and their acid / alkali performance is also 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 of green easily decomposed by acid. Organic pigments varieties, types, production and application are growing and expanding, has become a class of important fine chemical products.


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