What are the low molecular weight polyacrylamide?
The industrial production of polyacrylamide has a history of several decades, and the production process has been continuously improved. Now, PAM products according to molecular weight, there are mainly high, medium, low three, adjustable degree between 104-107. Among them, low-molecular weight products have higher requirements for each link in the production process. The production of low molecular weight PAM requires relatively high raw material purity, the general industrial monomer contains impurities such as iron, copper, O2, which will hinder the reaction, so when using acrylamide monomer, the content must be controlled above 95%. In the production of PAM, the role of the initiator is mainly to cause the oxidation – reduction reaction.
The amount of initiator and adding speed also affect the production of low molecular weight products. The amount of initiator is small, can not cause polymerization reaction, the amount of initiator is large, the reaction speed is accelerated, the polymer molecular chain is not easy to grow, the average degree of polymerization is reduced, and the molecular weight is decreased. The initiator addition rate and method affect the molecular weight of the polymer, a large number of practices have proved that the molecular weight of the polymer increases with the increase of the addition time, on the contrary, the molecular weight of the polymer will decrease. Therefore, in the production of low molecular weight products, strict control of the amount of initiator and adding speed is a key link. The reaction temperature also directly affects the size of the molecular weight, the temperature is too high, the polymerization reaction is intensified, the formation of detonation, seriously affecting the size of the molecular weight and the solubility of the product, on the contrary, the temperature is too low, the polymerization reaction can not be completely carried out, will also affect the size of the molecular weight. Therefore, in production, this is as important as the use of initiators, requiring uniform requirements and strict control.
