改性分散松香胶对纸模制品表观性能的影响

目的以HSCS-02型季铵型阳离子淀粉(CS)为阳离子助剂,山梨糖醇酐油酸酯(Span80)和聚氧乙烯(20)山梨醇酐单硬脂酸酯(Tween60)为乳化剂,松香为基料来制作阳离子分散松香胶,研究在CS,Span80和Tween60的不同用量下,阳离子分散松香胶对纸浆模塑包装制品表观性能的影响。方法通过向熔融松香中滴加Span80,Tween60和糊化CS乳液,对松香进行乳化和改性,制作阳离子分散松香胶;通过浆内施胶工艺制作纸模试样,测定其表面摩擦因数和光泽度,用以评定纸模制品的表观性能。结果随着Span80,Tween60和CS用量的增加,试样的摩擦因数先降低后升高,光泽度先升高后降低。结论 HSCS-02型季铵型阳离子淀粉中的季铵基可以大大降低熔融松香与水之间的界面张力,并使含有松香粒子的乳液颗粒带正电荷,松香粒子更好地附着在呈阴离子性的纸浆纤维上,纸模的表观性能得到提高;但CS用量过多,会使纤维絮聚结块,降低纸模制品成型匀度,降低其表观性能,其最佳质量分数(相对于松香的质量分数)为20%;Span80和Tween60对松香具有较好的乳化作用,其最佳质量分数(相对于松香的质量分数)均为10%。

Effect of Modified Dispersed Rosin on Apparent Performance of Molded Pulp Products

Cationic rosin was prepared with HSCS-02 quaternary ammonium type cationic starch (CS) as additive and sorbide oleate (Span80) and polyoxyethylene (20) sorbitol anhydride monostearate (Tween60) as emulsifier. The effect of cationic dispersed rosin on the apparent performance of molded pulp product was investigated with different amount of CS, Span 80 and Tween60. CS, Span80 and Tween60 were added to the molten rosin to produce emulsified and modified cationic dispersed rosin. Paper mould sample was made by internal sizing. Its gloss and surface friction coefficient were measured to evaluate the apparent performance of molded paper product. With the increase of the amount of Span80, Tween60 and CS, the friction coefficient of sample declined first and rose later while the gloss rose first and decreased later. In conclusion, the quarternary ammonium group in HSCS-02 quaternary ammonium type cationic starch can significantly decrease the interfacial tension between molten rosin and water, and provide appropriate positive charge to emulsion particles with rosin particles. Rosin particles can better attach to anionic paper pulp fiber, thus the apparent performance of paper mould can be improved; however, the excessive amount of CS will flocculate the fiber and thus reduce the molding evenness of molded paper product and degrade its apparent performance. The optimal mass fraction is 20% (relative to that of rosin). Span80 and Tween60 have good emulsification on rosin, and the optimal mass fraction is 10% (relative to that of rosin).