锂皂石与海藻酸钠联合稳定ASA乳液的制备及其施胶性能研究

Preparation and Sizing Performance of ASA Emulsions Stabilized by Laponite and Sodium Alginate

使用锂皂石与海藻酸钠联合稳定ASA乳液,研究了锂皂石与海藻酸钠的用量对ASA乳液稳定性和施胶性能的影响,探讨了固定锂皂石与海藻酸钠的用量下,硫酸铝用量、浆料pH值对ASA乳液施胶性能的影响,及乳液自身的水解稳定性。研究结果表明,海藻酸钠的加入有利于提高ASA乳液的稳定性和施胶性能,其用量0.3%时,施胶效果较好,加入0.5%的硫酸铝(对绝干浆)就使ASA乳液获得良好的施胶作用;在浆料pH值为5～9的范围内,ASA乳液均具有良好的施胶性能,在浆料pH值为6～6.5的范围内,ASA乳液施胶效果最佳。锂皂石与海藻酸钠联合稳定的ASA乳液放置120 min后,施胶效果仅降低16%,仍具有很好的水解稳定性。

ASA is a typical reactive neutral sizing agent. In this paper, Laponite nanoparticles together with sodium alginate were used to sta- bilize ASA emulsions. The influences of Laponite and sodium alginate addition levels on the stability and sizing performance of ASA emulsion were investigated. The effects of aluminum sulfate dosage and furnish pH on the sizing performance of ASA emulsion, as well as the hydroly- sis stability of ASA emulsion were analyzed. The results indicated that, the addition of sodium alginate can improve the stability and sizing performance of Laponite stabilized ASA emulsions. A small amount of aluminum sulfate can significantly enhance the sizing performance of ASA emulsions. ASA emulsions sizing performance is well from pH 5 to 9, but it has the best sizing performances at pH 6 - 6.5. When the storage time of the slabiliged ASA emulsions is over 120 minutes, its sizing efficiency only reduces by 16% , indicating a rather good hydroly- sis stability of the emulsions.