Abstract
Recently, in order to prevent water penetration, the rosin size emulsion that contains abietic acid, maleic rosin and rosin glycerin ester has been applied at many mills in neutral papermaking conditions. It is said that the role of the rosin glycerin ester is to prevent the dissolving of abietic acid and maleic rosin into water. To make clear this, the behavior of the rosin glycerin ester in rosin sizes in different papermaking conditions was investigated by ToF-SIMS (time of flight type secondary ion mass spectrometry). To assure certain detection of the rosin glycerin ester, we used a deuterium-labeled rosin glycerin ester synthesized using deuterium-labeled glycerin and analyzed by searching the deuterium ion peak. This labeling method was very useful for our purpose. ToF-SIMS images and the measurement of sizing effectiveness of handsheets prepared in different pH showed that rosin sizes containing rosin glycerin ester exhibited sufficient sizing effectiveness, and rosin glycerin ester still remained on pulp fiber surface in alkaline as well as in neutral papermaking conditions. However, rosin sizes without rosin glycerin ester did not show the size effectiveness in a neutral condition and that suggested abietic acid and maleic rosin were dissolved. This result supported the past research that rosin glycerin ester prevents the dissolving of abietic acid and maleic rosin into water in a neutral condition.
