硼砂对阳离子分散松香胶的施胶增效作用及机理

Effects and mechanism of borax on promoting sizing performances of cationic dispersed rosin emulsion

用硼砂(PS)作为阳离子分散松香胶(YSJ)的增效剂,研究了PS相对于PS和YSJ混合物质量分数对纸张施胶效果的影响,并通过表征混合乳液的接触角、粒径、Zeta电位和紫外特征吸收光谱,解析PS对YSJ的作用机理。结果表明:当w(PS)=10%时,纸张施胶度最大,比单一的YSJ提高了31.8%,此时混合乳液的接触角最大,粒径最大,Zeta电位最低,紫外吸收峰强度大幅度降低,此时YSJ胶粒表面的羧基已基本与PS结合,故对YSJ的施胶增效效果最好。

With the borax （PS） as the promoting agent of cationic rosin emulsion （YSJ）, the effects of the dosage of PS to PS/YSJ mixture on the sizing performances was investigated, and the mechanism of action of PS were explained by means of the contact angle, particle size, Zeta potential and UV absorption spectra of the mixed emulsion. The results indicated that when the dosage of PS to PS/YSJ mixture is 10%, the sizing degree reach the top, increased by 31.8% compared with a single YSJ. Meanwhile, the contact angle and particle size of the emulsion are also the maximum, Zeta potential value is the minimum and the intensity of ultraviolet absorption peak decreases substantially, which means that the carboxyl groups on the YSJ colloidal particle reacted with borax mostly, so the sizing performance is also best.