Evaluation of cationic polymers to control pitch deposition

摘要

A wide range of cationic polymers of varyingudchemical structure, charge density andudmolar mass were evaluated for their effectivenessudto control wood resin deposition.udThe ability of the polymers to attach modeludwood resin particles to thermo-mechanicaludpulp fibres and to maintain the woodudresin in the colloidal phase was determinedudat pH 4.75, 6.85 and 8.06.udHigh molar mass poly-DADMAC, copolymerudpoly-(AM-co-DADMAC) and guar gumudwere found to be the best fixatives over theudpH range investigated. The performance ofudpoly-DADMAC was found to increase withudmolar mass and charge density.udA conceptual model was proposed toudexplain the behaviour of the polymersudbased on their ability to stabilise the woodudresin colloids, to attach the wood resins toudpulp fibres and to affect the wood resinudparticle size.