研究了无皂苯丙聚合物的制备及其乳化AKD所得复合乳液的施胶性能,该复合乳液具有良好的分散性和稳定性。在采用阳离子淀粉和阳离子聚丙烯酰胺为双元助留剂、m(AKD):m(无皂苯丙聚合物)=4.6:1、105%下熟化10min、无皂苯丙聚合物/AKD复合乳液用最为0.2%-0.3%时,无论对草木混合浆还是小浆进行浆内施胶,施胶效果都很好;采用碳酸钙作为填料,对无皂苯丙聚合物/AKD复合乳液的施胶效果影响甚微.
A soap-free styrene and acrylates copolymer emulsion was prepared and used for emulsifying alkyl ketene dimmer (AKD), this composite emulsion was used as the neutral sizing agent with the better sizing efficiency and storage stability. In the presence of cationic starch (CS) and cationic polyacrylamide (CPAM) as dual retention agent, when weight ratio of m (AKD)/m (soap-free styrene acrylate copolymeric emulsion) = 4.6/1, curing time 10 minutes at the temperature of 105℃, the better sizing degree can be achieved in the case of mixed straw and wood stock or wood stock with adding 0. 2% - 0. 3% of the composite emulsion based on the dried pulp, meanwhile this sizing agent of composite emulsion can effectively disperse the un-reacted AKD into water and this composite emulsion maintains stable condition. There is little effect on sizing efficiency when calcium carbonate is used as the filler and the composite emulsion is used as sizing agent.