Use of polyester fabric brightener
The use of polyester fabric whitening agent is a simple introduction. The pure product is light yellow needle crystal, melting point 182 – 184 ° C, maximum absorption wavelength 363 nm, purple fluorescence, good whitening fastness and Light resistance, chlorine bleach resistance is also very good. The product has a crystalline powder and a slurry suspension dispersion. The suspension contains ≥10% active ingredient, which is yellowish white and has bright blue fluorescence. Neutral, non-ionic brightener, can be mixed with water (diluted in any proportion. Hard water resistant, weak acid resistant, weak alkali resistant, light fast. Can be used with most finishing agents and dye carriers applied to white fabrics) . Polyester fabric brightener production process will put 1050kg of chlorobenzene into the condensation reaction tank, add 105kg of p-o-aminophenol, 70kg of malic acid, pass the c02 gas, drive out the air in the kettle, stir, warm the reflux reaction, when the condenser When the water separator has a water output of 15 kg, 4 - Skg of boric acid is added to the reactor, and the reflux reaction is continued until the amount of water is further divided into 23 kg (about 38 kg of water is separated) (total reaction is about 12 h), and then the temperature is lowered. At 130 ° C, activated carbon was charged, and the mixture was heated under reflux for 0.5 h. The carbon residue was removed by hot suction filtration, the filtrate was cooled to 15 ° C, crystals were precipitated, suction filtered, and the filtrate was recovered. The filter cake was recrystallized from IV, IV-dimethylformamide, and dried to obtain a polyester whitening agent DT. Polyester fabric whitening agent use Polyester whitening agent DT is used for whitening of polyester, nylon, vinegar fiber or synthetic fiber with cotton and wool blend, and also for desizing and oxidative bleaching (including sodium chlorite bleaching). The amount of dyeing is 25 – 35g/L. The whiteness of dyeing increases with the increase of temperature, and it cannot be whitened immediately after padding. It needs high temperature baking to obtain good results. Also used for whitening of plastics, paints, etc. Please indicate the source. 100% Cotton Yarn Dyed Fabric,Yarn Dyed Cotton Fabric,Yarn Dyed Checked,Cotton Yarn Dyed Fabric Shaoxing City Yongteng Textile Co., Ltd. , https://www.yongtengtex.com
Polyester fabric whitening agent production principle There are more than ten production methods of polyester whitening agent DT. Here is a description of the condensation of o-amino-p-cresol with malic acid: firstly, two molecules of o-amino-p-cresol and hydroxysuccinic acid are condensed to form a hydroxysuccinyl hydrazide, and then a two-step intramolecular condensation synthesis is carried out to obtain a polyester. Brightener DTo