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Electric conductivity of wet recycled paper sheets

湿再生纸的电导率

基本信息

批准号：
04453142
负责人：
MURAKAMI Koji
金额：
$ 3.52万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04453142/
关键词：
Recycled pulp Electric conductivity additives dry-strength resin wet web testing method FT-IR-ATR spectrum 電気電導度

项目摘要

In order to develope quantitative determination of additives in recycled pulp, electric conductivity of wet pulp web and Fourier transform attenuated total reflection infrared (FT-IR-ATR) spectra of dry pulp sheet were investigated in this study. The concluding remarks for the paper sheets containing polyacrylamide (PAM) dry-strength additives and those further recycled are as followed.1.The electric conductivity of wet pulp sheet decreased with an increase of the PAM amount retained. The more cation amoumt in PAM increased the more the electric conductivity decreased.2.The electric conductivity of wet pulp sheet without PAM decreased on the first recycling and hardly changed by further recycling. On the other hand for the sheet with PAM,the electric conductivity hardly changed by any recycling.3.The difference ATR spectra between those of the sheets with and without PAM gave spectra of the PAM retained in the sheets. The absorbance of PAM characterizing band linearly increased with PAM content of the sheets irrespective of beating degree. Thus, a handy technique using FT-IR-ATR spectroscopy was proposed for determing the amount of PAM retained. Further, spectrum changes through the changes of ATR prism and beam angle indicated that PAM distribution very close to the pulp fiber surfaces irrespective of beating degree.4.The PAM retained in the sheets were gradually removed with an increase of the number of recycling procedures. The ratio of PAM removing was about 10% for a recycling. The decrease of tensile strength by recycling was large comparing with the decrease of PAM amount by recycling.

为了定量测定再生纸浆中的添加剂，本研究对湿纸浆的电导率和干纸浆片材的傅里叶变换衰减全反射红外（FT-IR-ATR）光谱进行了研究。对含有聚丙烯酰胺（PAM）干强剂的纸页和进一步回收的纸页的结论如下： 1.湿浆页的电导率随着PAM保留量的增加而降低。 PAM中阳离子含量增加越多，电导率下降越多。2.不含PAM的湿浆板的电导率在第一次回收时有所下降，并且在进一步回收后几乎没有变化。另一方面，对于含有PAM的片材，电导率几乎不会因任何回收而改变。3.含有和不含PAM的片材之间的差异ATR光谱给出了保留在片材中的PAM的光谱。 PAM 特征带的吸光度随纸页 PAM 含量线性增加，与打浆度无关。因此，提出了一种使用 FT-IR-ATR 光谱的便捷技术来确定 PAM 的保留量。此外，通过ATR棱镜和光束角变化的光谱变化表明，无论打浆程度如何，PAM分布都非常接近纸浆纤维表面。4.随着回收程序次数的增加，保留在纸页中的PAM逐渐被去除。 PAM去除率约为10%，可回收利用。与PAM用量的回收减少相比，回收拉伸强度的降低幅度较大。