Molecular Weight of Polyacrylamide
The molecular weight of polyacrylamide is an important basis for many users to distinguish the quality of polyacrylamide.
The so-called molecular weight refers to the length of the molecular chain. A large molecular weight does not mean good performance, and a small molecular weight does not mean poor performance. It mainly depends on the use. If it is used in sewage treatment, it must be combined with desilting The equipment and sludge properties, if used in the traditional crawler filter press, high molecular weight may cause problems such as clogged filter cloth and poor dehydration, affecting the dehydration effect; if used in a centrifugal desilter, because of its working principle Differently, the molecular weight requirement should be higher. The floc produced must be as resistant to shear as possible. It can also be understood that the floc must be strong enough, so choose a product with a higher molecular weight.
The molecular weight of cationic polyacrylamide is generally between 8-12 million, while the molecular weight of anionic polyacrylamide is generally between 5-22 million. Anionic polyacrylamide is generally used in coal washing, steel mill, electroplating plant, paper mill, ore dressing plant. , Tailings, power plants and other fields. The lower the molecular weight, the lower the viscosity of the drug solution under the same amount of conditions. The higher the molecular weight, the higher the viscosity of the drug solution. But the real basis for distinguishing the quality of cationic polyacrylamide is not the molecular weight, but the degree of hydrolysis. However, as mentioned above, it is good to choose the agent that suits your own water quality, rather than looking at the performance of the agent from the molecular weight.
