| Abstract:Causticizing calcium carbonate (CCC) known as white clay, can be used to replace precipitated calcium carbonate(PCC) as paper filler, which is of benefit to save resources and prevent secondary pollution. However, compared with the PCC, CCC can deteriorate the sizing efficiency of alkyl ketene dimer(AKD), thereby the application of the CCC was limited. This paper studied the reason of lower sizing efficiency of AKD when CCC was used as a filler. The results showed that the greater amounts of AKD adsorbed by CCC caused the lower AKD sizing efficiency. The irregular CCC with higher BET surface area and BJH pore volume resulted in higher adsorption. On the contrary, the spindle like or needle like CCC had lower BET surface area and BJH pore volume, and its adsorption amount of AKD was low, so the AKD sizing efficiency in the paper filled with those CCC was higher. |
