The viscosity of amphoteric polyacrylamide is an important measure of its quality, because viscosity is the most intuitive manifestation of molecular weight and easy to detect. The greater its molecular weight at the same concentration, the greater its viscosity. The solid content of 12.5% ​​of the dry strength agent produced in our institute is 1500-6000 mPa. s (25c [=]). The viscosity is too high, its poor water solubility is not conducive to use; too little viscosity, its reinforcing effect is not good. The factors affecting the reaction are mainly the pH of the reaction, the concentration of the initiator, the monomer concentration, the reaction temperature and the amount of the accelerator MPA.
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