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Functional Dyes' Application in Textile Dyeing and Finishing (PART II)

3. Infrared absorbing dyes and infrared camouflage dyes Infrared absorbing dyes are the type of dyes which can strongly absorb the infrared rays. Just as the common dyes, these dyes also have their specific Л- electron common rail system. What difference is their first excitation energy is relatively low, and what they absorb is not visible light but infrared ray with longer wavelength.The infrared camouflage dyes (or pigments) refer some of the dyes having specific color, these dyes' infrared absorption properties are very similar with the natural environment. Their difference with the common dyes mainly is their infrared absorption properties' similarity with the natural environment so that they can camouflage the dyed objects, and make the object not easily to be found by the infrared ray observation. In recent years, infrared absorbing dyes are closely used in solar energy conversion's and storage. This kind of dye or pigment can use to produce plastic film or textile and garment, it has great application prospects in industry, agriculture and garment industry. Infrared absorbing dyes or pigments are mainly used for the camouflage of the military equipments and of the warfighters. Because infrared ray camouflage research belongs to each country's high confidential issue, seldomly report the related technology. According to the information obtained from the patent literatures, they shows that small quantity of vat dyes minority filtered vat dyes by screening not only have great infrared absorption performance, and their color fastness can reach the requirements of military textiles. Thermochromic dyes and pigments Dye and pigment with thermochromic characteric is called a thermochromic dye and pigment. Dyes earlier used for the discoloration of printing for textiles are some of the thermosensitive recording dyes. Recent years, thermochromic dyes have been increasingly used in the dyeing and printing of textiles.