改性硫酸钙晶须用于纸张加填的研究

研究了硫酸钙晶须的基本性能,并与商品GCC填料进行对比。考察了硫酸钙用于纸张加填所存在的主要问题,并针对这些问题对晶须改性处理。将改性后的晶须用于纸张加填,结果表明:未改性硫酸钙晶须用于纸张加填时,由于其溶解问题导致手抄片灰分较低。采用改性后的硫酸钙晶须加填时,纸张灰分明显提高,达到了PCC加填时的灰分水平,并且纸张强度大幅提高,但光散射系数下降。此外,改性硫酸钙晶须加填纸的灰分为21.95%时,其强度性能与灰分为14.99%的PCC加填纸基本相同。

The investigation of calcium sulfate whisker filler

The basic properties of calcium sulfate whisker was studied and compared with commercial GCC filler. The key problems to calcium sulfate whisker as filler were investigated, and then the whisker was modified. The modified whisker was filled in the handsheet, which was compared with a kind of PCC filler. The results show that when unmodified calcium sulfate whisker is applied as filler, the ash content of the handsheet is lower due to the dissolution of the filler. On the contrary, when the modified whisker is filled, the ash content of the handsheet is raised to as much as the ash content filled with PCC, while the paper strength increases substantially, but the light scattering coefficient decreases. In addition, with the ash content of 21.95% for calcium sulfate whisker, the strength properties is as almost the same as the handsheet filled with PCC at the ash content of 14.99%.