| With poly (vinyl alcohol) (PVA), styrene (St), ethyl acrylate (BA), and acrylamide (AM)as main monomers, hydroxy propyl methacrylate (HPMA) as functional monomer, methacroylcholine chloride (DMC) as cationic-functional monomer, and glycidyl-trimethylammonium chloride (GTMAC) as cationic etherifying agent, the dry strength additive was prepared by semi-continuous emulsifier-free emulsion polymerization technique. The morphology of the emulsion particles and the treated paper were characterized by transmission electron microscopy and scanning electron microscopy.The result indicated that the Zeta potential of the emulsion has maximum and the dispersion system would be more stable when the dosage of DMC was 1.5% on the whole monomers. When the amount of GTMAC was 1.5%, the increase of dry strength was 24.7% and folding endurance was 36 times.When the amount of HPMA was 1.5%~2.0% on the whole monomers, the paper possessed higher dry tensile strength and folding endurance. |
