硫酸铝在阳离子分散松香胶施胶中的作用

探讨了硫酸铝与阳离子分散松香胶的作用及硫酸铝对松香胶施胶的影响。结果表明,在含水体系中,硫酸铝与阳离子分散松香胶聚集,但有利于阳离子松香胶粒子在纸张中的均匀分布和防止松香胶粒子的聚并。硫酸铝的加入提高了阳离子分散松香胶的软化点和熔点,从而有利于提高松香胶的疏水性,防止胶膜在干燥中的破坏,但不影响松香胶粒的熔融铺展。硫酸铝的加入量对纸张施胶产生更为重要的作用。

The Function of Alum in Cationic Dispersed Rosin Sizing

The reaction of alum with cationic dispersed rosin size under various conditions and its effect on the rosin sizing development were investigated.The results showed that there is an aggregation between alum and cationic dispersed rosin size in aqueous system,but it is still of benefit to the uniform distribution of rosin particles on paper surface and prevent them from merging into large ones.The existence of alum significantly increases the softening and melting temperature of the cationic dispersed rosin size while that does not prevent the rosin size melting and spreading on the paper surface.Alum also improves the hydrophobicity of rosin size film and promotes the formation of well constructed rosin film during drying.The dosage of alum instead of the ratio of alum to rosin size is more important to the sizing development of cationic dispersed rosin size.