| Abstract:Highly dispersed rosin sizing agent was prepared using the self-made anionic acrylic copolymer emulsified rosin, and this rosin latex emulsion had smaller particle size and could be used as neutral sizing agent in pulp. In this paper, the main factors affecting neutral sizing were also studied. The optimum ratio of rosin and emulsifier was 1∶1； Optimal sizing conditions were as follows: highly dispersed rosin dosage 1%, Al2(SO4)3 dosage 4%, cationic polyamide polyamine epichlorohydrin (PAE) dosage 0.05%, pH value was 5.5~7.0.Reverse sizing was better than normal sizing in solving the problem of hard water impurities. SEM observation indicated that, reverse sizing was better than normal sizing in rosin latex distribution, improving fiber surface cracks and defects, etc. The anionic rosin size had better overall performance than the commercially available neutral rosin size. |
