1.2 synthesis method

A certain amount of deionized water was added into a four port flask with thermometer, stirrer and reflux condenser tube, then amps (2-acrylamido-2-methylpropanesulfonic acid), IA (itaconic acid) and Dy were successively added, and NaOH solution was added at a certain stirring speed to adjust the pH value of the reaction system. After that, the initiator solution was added to the reaction system after the reactants were completely dissolved, and then the temperature was raised and refluxed for 2 h. Finally, a colorless liquid retarder ZOC-H50S (effective concentration of 30%) was obtained by natural cooling to room temperature.

2. ZOC-H50S infrared spectrum analysisAfter separation and purification with propanol, ZOC-H50S was analyzed by ft-s3000 FT-IR spectrometer. According to the infrared spectrum of ZOC-H50S

The results show that 3300.99cm¯¹ is the stretching vibration absorption peak of N-H; 2938.71cm¯¹ is the stretching vibration absorption peak of - CH Theil; 1637.66cm is the stretching vibration absorption peak of C = O in the sulfonic group of AMPS; 1299.57cm¯¹ and 1054.59cm¯¹ are the symmetric and asymmetric stretching vibration absorption peaks of S = O in the sulfonic group of AMPS; 1499.23cm¯¹ and 1369.85cm¯¹ are the symmetric and asymmetric stretching absorption peaks of C = O in carboxylic acid group of IA; 3084.69cm¯¹ and 1369.85cm are the symmetrical and asymmetric stretching absorption peaks of C = O in carboxylic group of IA, respectively The results show that 860.31cm¯¹ is the absorption peak of C-H in Dy, 767.51cm¯¹ is the vibrational absorption peak of C-N bond in Dy, there is no characteristic absorption peak of C = C in 1620.00 ~ 1635.00 cm¯¹, indicating that there is no unsaturated monomer in ZOC-H50S, which is the target product.