Sequestering Agent Commonly Used in Printing and Dyeing
Time: Click: 171
Sequestering agent, also known as complexing agents, are organic or inorganic compounds that chelate with heavy metal ions to form stable water-soluble complexes and passivate heavy metal ions. The molecule of the compound contains electron donors that can coordinate and bind with heavy metal ions, so it has a series of special effects, such as softening, descaling, rust protection, stability, and synergism. The common sequestering agent used in printing and dyeing is as follows.
(1)Phosphates: mainly including sodium tripolyphosphate, sodium polyphosphate, sodium hexametaphosphate, sodium pyrophosphate and so on.
Because of its ion exchangeability, this reagent is the first softener used in printing and dyeing industry. Sodium pyrophosphate can form complex ions with iron ions, so it can be used as hydrogen peroxide stabilizer. However, inorganic phosphate is prohibited in some areas.
（2）Aminocarboxylic acid: mainly contains ethylenediaminetetraacetic acid (ED-TA), namely softener B; nitrogen triacetic acid (NTA), namely softener A. In addition, there are diethylenetriamine pentaacetic acid (DTPA), N-hydroxyethyl ethylamine triacetic acid (HEDIA), ethylene glycol monobis (B-aminoethyl ether) - N, N-tetraacetic acid (EGTA).The ligands of aminocarboxylic acid chelating agents are nitrogen atoms and negatively charged carboxylic acid radical ions (COO-). The more ligands, the stronger the complexation with metal ions. Among them, DTPA cooperates most strongly with most metal ions, followed by EDIA and HEDIA, and NTA is the worst. Among them, DTPA is the best hydrogen peroxide stabilizer. However, NTA, EDTA, DTPA, and others have very poor biodegradability due to metal chelation and have been banned in some European countries in recent years.
March 2, 2017HT Fine Chemical Co. Ltd., in Qingyuan city, Guangdong Province, will send a professional sales team to rejoin the 17th China Interdye 2017 held in Shanghai World Expo exhibition hall from 12th to 14t...view
June 9, 2017InkSublimation Printing ink is the key material of dye sublimation printing technology which is mainly composed by the disperse dyes, connecting materials, solvents and a few additives.The dye must ha...view
May 19, 2017At present, the effective methods that can prevent the amino silicone oil causing yellowing are as follows:(1)Dongguan Hongqi chemical Co., Ltd introduce high sterically hindered secondary amine into ...view
May 11, 2017I. The choose of dyeThere are a great variety of reactive dye with different quality level. So the choose of qualified dye becomes important.1. The choose of bi-functional reactive dyes and multi-func...view