| Abstract:Using model sticky substances consisted of the components of wood extractives and synthetic polymers, the effects of metal ions, cationic polymers and mineral fillers on the physicochemical properties and depositional behavior of sticky substances were investigated. Results showed that introducing Al3+ into the system, even at a low concentration, can markedly destabilize sticky substances, and a similar behavior is observed for Ca2+. Cationic polymers affect significantly the stability of sticky substances. Polyethylene imine (PEI) results in destabilization at the neutral point, and lead to maximum deposition of stickies. Cationic polyacrylamide (CPAM) accelerates the aggregation of sticky particles even at a low dosage. Sticky particles may regain the stabilization as adding excessive dosage of PEI, but it may not be the similar for adding CPAM. Less sticks deposition is observed, when the system contains pulp fibers, which may be attributed to the attachment of stickies onto the fibers. Fillers can adsorb the sticky substances at a low dosage. However, the whole surfaces of stickies may be covered by excess amount of fillers and results in a less deposition. |
