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Preparation of anionic polyacrylamide:
The reaction of acrylic acid and acrylamide monomer to synthesize polyacrylamide is a free radical polymerization reaction. The polymerization rate, the composition of the copolymer, the molecular weight of the product and its molecular weight distribution are important indicators to measure the reaction. polyacrylamide flocculant The factors affecting these indicators are mainly reactive Temperature, pH of the reaction solution, initiation system, monomer ratio and concentration, etc.
The molecular weight of anionic polyacrylamide is an indicator that distinguishes them. The molecular weight of polyacrylamide apam ranges from 5 to 20 million. As the degree of hydrolysis increases, the carboxyl anion increases, and the molecular chain continues to expand, thereby gradually increasing the flocculation effect. effect;
At the same time, the electronegativity of polyacrylamide molecules has gradually increased, which prevents it from adsorbing negatively charged sediment impurities, and the active group-amide group, which plays a major role in the adsorption and bridging, has also been continuously reduced. With the increase of the degree of hydrolysis, there are factors that make the flocculation effect gradually worse.
As a comprehensive result, there must be an optimal degree of hydrolysis to maximize the flocculation effect, that is, there must be an optimal degree of hydrolysis. anionic polymers water treatment Therefore, the degree of hydrolysis of anionic polyacrylamide is not as high as possible. Everything has a limit, and the right one is the best. When you choose polyacrylamide apam, don't blindly pursue the degree of hydrolysis, you must do experiments to see which works best. |
