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How to select appropriate organic pigment ?
The industrial technology of organic pigments includes not only the chemical reaction of organic pigments and their intermediates, but also the influence of the surface chemical structure of organic pigments and the existence of specific substituents on their physicochemical properties and applications (such as color, light and climate fastness, heat stability and molecular polarity). Organic pigments are insoluble in applied media, and colour substances with fine particles with specific surface properties.
Organic pigments can be prepared with the same chemical structure according to the specific requirements of different uses to achieve the best results.
Organic pigments commonly used in paints and paint coloring should have sufficient durability, such as sun fastness, climate fastness, high covering power or specific transparency, ideal solvent stability, color and light stability in oil or water-borne paint dispersing media, and no obvious flocculation during storage and use.
The organic pigments applied to the coloring of rubber and resin-based plastics should be easily dispersed uniformly in the colored substances and have good compatibility with resins. The pigments colored by rubber should also be vulcanized-resistant, especially with satisfactory thermal stability and no change of colour and light at the temperature of forming process. When coloring plastics, pigments should also have good solvent resistance, migration resistance, and good stability of plasticizers commonly used in them.
The three basic colors (yellow, magenta and blue) used in printing ink have specific spectral characteristics, good brightness and satisfactory transparency. Especially in the widely used four-color overprinting process, yellow pigments with excellent transparency should be used when overprinting with black, blue, magenta and yellow respectively. In addition, in order to ensure the quality of printing ink, good dispersibility is also very important. The ink used for iron printing should also withstand the temperature above 160 - 170 C without changing the color and light.