In this paper, the efficiency of styrene-acrylic emulsion as internal size was discussed when both cationic polyelectrolyte polyamid-eamine epichlorohydrine (PAE) and anionic poly-electrolyte carboxymethyl cellulose(CMC) were added as strength additives in the paper-making process. The added amount of styrene-acrylic emulsion had a remarkable effect on internal sizing and paper strength. When the dosages of PAE and CMC were constant, and breaking length increased while tear index decreased. Raised amount of PAE could improve sizing degree, but CMC had an adverse effect on sizing degree. Therefore, when PAE/CMC dual-polymer strengthening system and styrene-acrylic emulsion are added simultaneously into stock, electric charge ratio of PAE and CMC is the key factor influencing the internal sizing efficiency of styrene-acrylic emulsion. Sizing degree rapidly increases with the increase of charge ratio of PAE to CMC in the range of 1. 5 to 4.0, then begin to level off. The sizing degree is 90% of the control sample when the charge ratio of PAE to CMC is 8. 0.%针对扬声器纸盆、纸浆餐盒等抗水性要求高的模塑产品,研究了在阳离子聚酰胺-环氧氯丙烷树脂(PAE)和羧甲基纤维素(CMC)组成的PAE/CMC二元增强体系中苯丙乳液浆内施胶效果.结果表明,在PAE/CMC二元增强体系中,PAE与CMC的电荷比影响苯丙乳液施胶效果,当PAE与CMC的电荷比在1.5 ～4.0之间,随着PAE和CMC的电荷比的增加,纸张施胶度快速增加,继续增加PAE与CMC的电荷比,纸张施腔度变化趋缓,当PAE与CMC的电荷比为8.0时,继续增加PAE与CMC的电荷比,纸张的施胶度基本不变.
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