无机盐与DCS对细小纤维润胀水化的作用研究

The Synergism Effect of Inorganic Salts and DCS on the Swelling and Hydration of Fiber Fines

研究了无机盐及DCS(溶解和胶体性阴离子干扰物)对细小纤维的保水值及纸浆滤水性能的影响。结果表明,无机盐电解质的积累使得纸料系统的电导率升高,极大地降低细小纤维的保水值并改善细小纤维的滤水性能。且Ca^(2+)对降低细小纤维的润胀水化的作用大于Na^+。无论是水溶性阴离子模拟物、胶体性阴离子模拟物,还是它们的混合物(DCS)都削弱了无机盐对细小纤维水化层的压缩作用,使得细小纤维的保水值增大、纸料的滤水时间变长。碱木素阴离子模拟物对纸料滤水性能的影响大于聚丙烯酸钠阴离子模拟物,阴离子分散松香胶模拟物对细小纤维的保水值和纸料的滤水时间受电导率影响较大,而羧基丁苯胶乳阴离子模拟物对细小纤维的保水值受Ca^(2+)的影响相对较小,DCS对细小纤维的保水值及滤水性能影响很大,其影响程度超过了任何单一阴离子模拟物。

The accumulation of inorganic salts will enhance the conductivity of the furnish, which greatly decreases the water retention value （WRV） and improves the drainability of the fines. And the Ca^2＋ ion has higher capbility than Na^＋ ion to reduce the swelling and hydration of the fines. Either dissolved substance, colloidal substance, or dissolved and colloidal substance （DCS） all weaken the compressing capbility of metal ions to adsorb double layer of fines, which augments the WRV of the fines and enlongs the water drainage time. Also the research results showed that the effect of alkline lignin on the drainability of fines is greater than that of sodium polypropylene acid. And the effect of anionic dispersant rosin on the WRV and drainability of fines depends on the conductivity greatly, and SBR has a little impact on fines in the Ca^2＋ ion environment. DCS has great impact on the swelling and hydration of the fines, surpasses any single anionic trash.