abstract

Commercial alkyl ketene dimer (AKD) waxes generally contain 80-90% AKD and the rest of the components are by-products, such as fatty acids, acid anhydrides, and AKD oligomers.
In this paper the effects of fatty acid components present in AKD waxes
on AKD emulsion stability and paper sizing performance were using AKD
emulsions prepared from a mixed AKD wax with 0-12% stearic acid and palmitic acid. Repeated thermal-shock treatments revealed that the fatty acids-containing AKD emulsions unstable at 3% fatty acid content was, while those
with 12% fatty acids were quite stable. When the addition of fatty acids was increased
up to 12%, increased zeta potentials of the AKD emulsion particles of 1.4 mV to 4.4 mV
with increasing fatty acids. This increase of the zeta potential can be one of the factors that
will lead to a decrease in AKD retention ratios in broadsheets. Thus reducing fatty acid
components in AKD waxes not only the pure AKD content present in the growth,
but also have negative effects on the emulsion stability and paper sizing performance.
These results indicate that fatty acids in AKD waxes are regulated sufficiently kept
as low as possible to a standard level of AKD wax to maintain quality.
Read More:AKD Wax sales
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