论文部分内容阅读
用纤维素微纤丝和聚合电解质PAE配合使用可以提高纸张干强和湿强。通过用石英微量天平(QCM-D)和原子力显微镜(AFM)研究了微纤丝和PAE在纤维素模型表面的吸附情况。比较了微纤丝和PAE在纤维中的添加方式对纸张的纤维层结构和微纤丝形成的微聚集体的不同。结果表明:PAE首先被吸附在纤维素模型表面形成均匀层,然后微纤丝黏性层才被吸附;如果PAE和微纤丝是以阳离子混合体被吸附的,则形成的是不规则的刚性层;在抄造纸样时,当采用先加PAE后加微纤丝的双层(bi-layer)系统添加方式时,即使添加少量的PAE也能使纸样的干强和湿强明显增加;当采用PAE和微纤丝混合形成混合体然后添加的方式时,纸张强度的提高不是很明显。同时,通过对纸样体积和表面含氮量的分析表明,添加方式不会影响PAE的总吸附量,但是它对纸样中组成的分布有很大的影响,而组成的分布对纸张干强和湿强的形成有很重要的影响。
With cellulose microfibrils and polyelectrolyte PAE used in combination can improve paper dry strength and wet strength. Adsorption of microfibrils and PAE on the surface of the cellulose model was investigated by using a quartz microbalance (QCM-D) and an atomic force microscope (AFM). The addition of microfibrils and PAE to the fibers was compared with the fibrous layer structure of the paper and the micro-aggregates formed by microfibrils. The results showed that the PAE was first adsorbed on the surface of the cellulose model to form a uniform layer, and then the microfibrous viscous layer was adsorbed. If the PAE and microfibrils were adsorbed by the cationic mixture, irregularly formed rigid Layer; when papermaking was used, the dry strength and wet strength of the paper samples were significantly increased even with the addition of a small amount of PAE when using the bi-layer system with the addition of PAE followed by the microfibrillation; PAE and microfibrils mixed to form a mixture and then add the way, the increase in paper strength is not obvious. At the same time, the analysis of the sample volume and surface nitrogen content showed that the addition mode did not affect the total adsorption amount of PAE, but it had a great influence on the distribution of the composition in the sample. However, Strong formation has a very important influence.