阳离子聚丙烯酸酯-二氧化硅复合乳液表面施胶剂的合成及应用

以苯乙烯、丙烯酸丁酯、甲基丙烯酰氧乙基三甲基氯化铵、丙烯酰胺为共聚单体,通过半连续种子乳液法制备阳离子聚丙烯酸酯-二氧化硅复合乳液,并将其作为表面施胶剂对瓦楞原纸进行施胶。研究表明,半连续种子乳液法制备复合乳液的较优条件为:pH值2.25,引发剂用量为单体总量的0.5%,二氧化硅用量2%,硅溶胶与亲水单体一起加入。此条件下制得的复合乳液施胶纸的Cobb值较纯聚丙烯酸酯乳液施胶纸的下降71%;环压指数较原纸的提高41%。当二氧化硅用量为8%时,制备复合乳液施胶纸的Cobb值较纯聚丙烯酸酯乳液的下降33%,但是施胶纸对水的接触角由62°增大为120°。

Preparation and Characterization of Cationic Acrylate-silica Hybrid Latex Surface Sizing Agent

Series of cationic acrylate/silica hybrid latexes were prepared by semi-continuous seed emulsion polymerization, using styrene, butyl acrylate, (2-(methacryloyloxy) ethyl) trimethyl ammonium chloride and acrylamide as monomers. The optimal condition of semi-continuous emulsion polymerization of a pre-emulsion was pH value of 2.25 in the presence of 0.5% initiator AIBA, on the mixture of St and BA, and 2% silica was added along with the hydrophilic monomers. The Cobb value of the paper sized by latex with 2% dropped 71% compared with the paper sized by pure poly-acrylate emulsionand the ring crush index of the paper sized by latex with 2% silica increased by 41%. Though the water resistance of the paper sized by the latex with 8% silica was not as good as the latex with 2% silica, the contact angle increased to 120°.