use | disperse red S-R is used for high temperature and high pressure dyeing polyester-cotton blended yarn and polyester knitting yarn, and is also used for direct printing of polyester-cotton blended fabric. Sun fastness and sublimation fastness are good. It is one of the three primary colors of high-temperature disperse dyes. It can be combined with disperse red jade H2GFL to dye red sauce color; it is combined with disperse yellow brown H2RL to dye red brown; hot melt and pad dyeing iron rust red in the same bath with reduced red R. Also used for dyeing diacetate fiber, triacetate fiber, nylon, dyeing acrylic fiber can only get light color. It is mainly used for dyeing and printing of polyester and blended fabrics, and can also be used for dyeing acetate and triacetate |
Production method | Using m-nitroaniline and p-nitroaniline as the main raw materials, m-nitroaniline and ethylene oxide are first subjected to ethoxylation reaction, and then esterified with acetic anhydride, then reduced by catalytic hydrogenation, and propionyl (or acetyl) to obtain the coupling component; then the p-nitroaniline is diazotized and coupled with the coupling component to obtain the product. The finished product is filtered, ground and dried.. The synthesis of the coupling components can also be carried out according to the following process:. The following methods are used for the synthesis of domestic dye coupling components:. Add 236kg of water and 38.6kg of m-phenylenediamine (98%) into the acylation pot, raise the temperature to 60-65 ℃, wait for the materials to be completely dissolved, cool to 28 ℃, add 47kg of hydrochloric acid (30%) dropwise within 2h, maintain 28-32 ℃, continue stirring for 15min, add 52.5kg of refined salt (industrial product), stir for 30min, then add acetic anhydride (90%) dropwise within 2h at 28-32 ℃, and add and keep the temperature for 1h. Filter, filter cake with 15-30 ℃ saturated salt water wash until the filtrate is colorless, standby. The above-mentioned acylation products and 120kg of water were added to the enamel pot, slowly heated to 70-75 ℃, then stirred for 15min, and bubbling was started to pass ethylene oxide (about 50kg) until the end of the reaction. Then concentrated at 53.3kPa (about 95-100 ℃) until the water content is 15%-20%. Cooling to 50 ℃, adding 17.05kg of acetic acid (98%), heating to 80 ℃ within 0.5-1h, slowly adding 125.5kg of acetic anhydride (98%), maintaining 80-90 ℃, and adding within about 2h. Then raise the temperature to 95-100 ℃, keep the temperature for 3h to the end of the reaction. Cooling to 25-30 ℃ to obtain about 70kg of coupling component. 32.2kg of p-nitroaniline (93%), 79kg of hydrochloric acid (30%) and 17.4kg of sodium nitrite (93%) were diazotized at 0-5 ℃, and then coupled with the coupling components at 15-20 ℃ for 4-5h to obtain dye of about 63kg (dry product). |