Sodium methacrylate-2-acrylamido-2-methyl propane sulfonate copolymer

[Preparation method] The preparation of sodium methacrylate-2-acrylamido-2-methylpropanesulfonate copolymer mainly uses sodium methacrylate and 2-acrylamido sodium 2-methylpropanesulfonate The monomer is copolymerized in an aqueous medium, and the reaction formula is:

The specific process is: adding 945.
59g deionized water and 141.
96g 58% sodium 2-acrylamido-2-methylpropanesulfonate into a 1.
5L resin reactor equipped with a stirring blade, a temperature controller and a condenser.
Body solution, 126.
18g 99% methacrylic acid monomer and 114.
9g 50% sodium hydroxide solution.
After adjusting the pH value of the above mixed solution to 7.
0, add 0.
20g EDTA, and pour nitrogen into the above reaction system.
The amount is 1000cc/min, the temperature is raised to 45°C, and 0.
5g 2,2' azobis-(N,N-2-amidinopropane) dichloride (V-50) is added, and the polymerization reaction starts within 5 minutes.
After 60 minutes, the system solution began to become viscous, the temperature was raised to 50°C, and the reaction was continued at 48-52°C for 72 hours to obtain sodium methacrylate-2-acrylamido-2-methylpropanesulfonate sodium copolymer.
The Brookfield viscosity of the product at 25°C is 61300mPa·s
.