乳化剂对SAE表面施胶剂合成及应用的影响

乳化剂是乳液聚合体系的重要组成部分,并对聚合物乳液的应用性能具有一定的影响。以苯乙烯丙烯酸酯(SAE)表面施胶剂的合成为例,研究了乳化剂的用量对SAE合成及性能的影响。以苯乙烯、丙烯酸丁酯和丙烯酸为单体,硫酸亚铁-过氧化氢作为引发体系,十二烷基硫酸钠(SDS)和壬基酚聚氧乙烯醚(OP-10)作为乳化剂,并加入适量的淀粉,合成了苯乙烯丙烯酸丁酯(SAE)聚合乳液。利用正交实验的方法,比较了乳化剂用量、淀粉用量、SDS占乳化剂的比例及预乳化转速等因素对苯乙烯丙烯酸酯(SAE)表面施胶剂合成效果的影响,并且探讨了采用不同的表胶添加量对纸张性能的影响。结果表明,对表面施胶剂性能影响最大的因素是乳化剂用量;最佳工艺方案为乳化剂总用量为单体量的2%、预乳化转速为600 r/min、淀粉用量为单体量的20%、SDS占乳化剂用量的1%;以最佳方案合成的表面施胶剂对纸张进行表面施胶,Cobb值可达到39.2 g/m2;表胶添加量为淀粉绝干量的5%时,相对于未添加时的纸张,Cobb值下降了58.4%,表面强度上升了57.7%。

Effect of emulsifier on the synthesis and application of SAE surface sizing agent

Emulsifier is an important ingredient in emulsion polymerization,and will give some influence on the performance of the synthesized emulsion.Synthesis and application of SAE surface sizing agent was taken as the sample to examine the influence of emulsifier on the synthesis and application of SAE.Styrene,acrylic ester and acrylic were used as the monomers,acid sodium laurel sulfate(SDS) and alkylphenol ethoxylates(OP-10) as emulsifier,FeSO4-H2O2 as initiator system,and appropriate amount of starch was added in.Orthogonal design was utilized to compare the effect of four factors on the synthesis and application of SAE surface sizing agent,such as the dosage and proportion of emulsifier,the starch amount and the revolving speed in preemulsification stage.The most suitable additive amount of synthetic sizing agent was also discussed in this paper.The results showed that the amount of emulsifier had the most influence on the property of product.The optimum conditions were as follows: amount of emulsifier 2 % to monomers,revolving speed 600 r/min,amount of starch 20 % to monomers,SDS scale 1 % to total emulsifier.Taking this sizing agent,Cobb value of paper decreased to 39.2 g/m2.When the additive was 5 % to the dry weight of starch,compared to no addition,Cobb value decreased by 58.4 % and the surface strength enhanced by 57.7 %.