关键词: 松香, 阳离子, 乳化剂, 施胶剂

Abstract:

Cationic rosin sizing agents can be used to neutral sizing, so the study about it is very important to papermaking industry, whose condition is converting from acidic to neutral or alkalinity, and rosin processing and utilizing industry in China. In this paper, the cationic rosin dispersion sizing agent HPCRZ was successfully prepared under high temperature and normal pressure with a cationic dispersant, which was obtained by synthesis and mixing in the laboratory. HPCRZ's properties, which included its color and state, concentration, pH value, Zeta potential and particle diameter distribution, were analyzed. The sizing degree of its paper samples was determined by Stckigt method. The permanence of its paper samples was analyzed by ageing in oven and expressed with white degree R₄₅₇ and L^*、a^*、b^* three dimensional color space. At the same time, those properties of control sample were analyzed in order to compare with it conveniently. The result showed that, HPCRZ had high cationic Zeta potential. There were two peaks in its curve of particle diameter distribution. After homogenizing, the peak of bigger particle diameter was reduced to a shoulder. Its volume average particle diameter was 0.567 μm and consistency was 0.652. The particle diameter distribution was close to that of the control. When the paper samples were making with recycled fiber, Al₂(SO₄)₃ dosage was 1.0%, sizing agent dosage was 1.0%, temperature was 10℃, pH value was 6.0 and 5.0, and no other auxiliary agents, the sizing degree was 53 s and 67 s respectively. Its R₄₅₇ decreased 2.23% and 2.64%, yellow blue axes color index b^* increased 2.00 and 2.29, whole color difference ΔE_ab^* was 2.10 and 2.33 respectively after ageing. When pH value was 6.0, temperature was 20℃, and other conditions were not changed, the sizing degree was 52 s and the R₄₅₇ decreased 2.17%, b^* increased 2.24, ΔE_ab^* was 2.32. HPCRZ's sizing effective was almost same with that of the control under these experiment conditions, and the permanence was better.

Key words: rosin, cationic, dispersant, sizing agent