丙烯酸酯聚合物表面施胶剂的合成与应用

Synthesis and Application of Polyacrylate Surface Sizing Agent

采用种子半连续法乳液聚合工艺,以十六烷基三甲基氯化铵(CTAC)和壬酚基聚氧乙烯醚(OP-10)复配作为乳化剂,选用甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)和丙烯酸-β-异辛酯(2-EHA)为单体,经偶氮二异丁基脒盐酸盐(AIBA)引发上述单体的自由基乳液共聚反应,以制备一种阳离子型丙烯酸酯聚合物表面施胶剂。采用傅里叶红外光谱(FT-IR)和示差扫描量热分析仪(DSC)对聚合物进行表征;以马尔文粒度仪和透射电子显微镜(TEM)研究聚合反应中各种因素对乳液聚合的稳定性、聚合物乳胶粒子的粒径及其分布、乳胶粒子的形态结构的影响;通过扫描电子显微镜(SEM)、表面张力仪和Cobb值测定仪对采用该乳液表面施胶前后纸张的表面形貌、静态接触角以及抗水性进行观察和测试。研究结果表明,当AIBA用量为单体总量的1.6%、DMC用量为单体总量的5.0%以及2-EHA用量为单体总量的15.0%时,自制聚合物乳液的表面施胶效果最佳。

In this research, the cationic polyacrylate copolymer emulsion used as surface sizing agent was prepared via semi-continuous seed emulsion polymerization, using cetyltrimethyl ammonium chloride （CTAC） and OP-10 as emulsifier, methyl methacrylate（ MMA）, butyl ac- rylate（ BA）, cationic monomer-methacryloyloxy ethyl trimethyl ammonium chloride（DMC） and 2-ethylhexyl acrylate （2-EHA） as monomers, and by azobis isobutyl amidinehydrochloride（AIBA） as initiator. The structure and thermal decomposition behavior of the copolymers were tested by FI＇-IR and DSC respectively, the particle size and their distribution, the morphology of the emulsion were tested by Malvern Nano- sizer and TEM. The surface morphologies of the papers without and with surface sizing agent, were investigated by scanning electron micros- copy （ SEM）, and the water resistant property of the sized paper was characterized by surface tension meter and Cobb value tester as well. It was found that the water resistant property and the Cobb value of the sized paper were improved greatly, the emulsion had the best perform- ance when the dosage of AIBA accounted for 1.6% of total amount of the monomers, dosage of DMC and 2-EHA accounted for 5.0% and 15.0% of total amount of the monomers respectively.