Fluorescent dye is a dye that can strongly absorb in the visible light range and can radiate fluorescence. From the 20th century to the present, organic fluorescent dyes have been widely used in various industries such as textiles, plastic dyeing, and printing pigments. They can also be used in marine life-saving signs, medical clinical identification, blood circulation, and groundwater exploration.
With the improvement of people's economic level, ordinary textiles are becoming less and less able to meet people's needs for textiles. Textiles dyed with fluorescent dyes are bright and eye-catching, with unique and novel visual perception, and can improve the aesthetic value of textiles when used in clothing, shoes and hats. One of the most important advantages of fluorescent dyes is safety and warning. Especially in recent years, with the strengthening of national security work and the improvement of people's safety awareness, high-visibility warning clothing has been widely used on roads. Therefore, the research on fluorescent dyes has attracted more and more attention.
Acid Fluorescent Yellow 73 (the structural formula is as follows) contains 2 hydrophilic hydroxyl groups and 1 hydrophilic carboxyl group. It can be inferred that the carboxyl group of Acid Fluorescent Yellow 73 forms an ionic bond with the amino group of nylon, and the hydroxyl group is bonded to the amino group of nylon. The formation of hydrogen bonds and Van der Waals forces combine.
Dyeing nylon 6 with Acid Fluorescent Yellow 73. The effects of dyeing pH, dyeing temperature, dyeing time, NaCl dosage, and dye dosage on the apparent color depth K/S value were discussed, and the fluorescence effect and color fastness of the dyed fabric were tested. . The research results show that the K/S value of dyed fabrics gradually increases with the increase of dyeing temperature and dyeing time, and gradually decreases with the increase of dyeing pH and NaCl dosage; dyed fabrics have a certain fluorescence intensity, which can be Meet the fluorescent requirements of other clothing other than warning clothing. The best dyeing process for nylon 6 is: Acid Fluorescent Yellow 73 dosage 2% (omf), dyeing pH=5, dyeing temperature higher than 80 ℃, dyeing time 60 min. The fabrics dyed in this process have good color fastness to soaping and rubbing.
1. When the dosage of Acid Fluorescent Yellow 73 is 2% (omf), the best conditions for dyeing nylon 6 are: pH=5, dyeing temperature above 80 ℃, dyeing time 60 min.
2. As the amount of dye increases, the reflectance of dyed nylon 6 fabric first increases and then decreases, and the fluorescence efficiency gradually decreases.
3. The color fastness to soaping and rubbing of acid fluorescent yellow 73 dyed nylon 6 fabric can meet the requirements of wearing.