Mg（OH）2粒径对辐射松氧脱木素的影响

Effect of the Particle Size of Mg（OH）2 on the Oxygen Delignification of Radiata Pine Kraft Pulp

中文关键词:  辐射松硫酸盐浆  Mg（OH）₂  过渡金属离子  氧脱木素  黏度

Key Words:radiata pine kraft pulp  Mg（OH）₂  transition metal ion  oxygen delignification  viscosity

中文摘要:

      为进一步探讨镁盐作为纤维素保护剂的作用机制，研究了纸浆氧脱木素过程中添加不同粒径（20、50、100、200、500 nm）的Mg（OH）₂对添加多种过渡金属离子（Cu²⁺、Mn²⁺和Fe³⁺）的辐射松硫酸盐浆氧脱木素的影响，通过测定氧脱木素后纸浆卡伯值和黏度，分析不同粒径Mg（OH）₂对纤维素的保护效果。研究结果表明，在纸浆氧脱木素过程中，不同粒径的Mg（OH）₂对纸浆卡伯值、木素脱除率没有显著影响；但小粒径的Mg（OH）₂对纸浆黏度的保护能力要优于大粒径的Mg（OH）₂。氧脱木素中添加Mg（OH）₂粒径越小，纸浆黏度降低越少，手抄片物理强度越大。

Abstract:

      To further explore the mechanism of magnesium salt as a cellulose protectant in oxygen delignification， different particle sizes （20， 50， 100， 200， 500 nm） of Mg（OH）₂ were added in the oxygen delignification system， various transition metal ions （Cu²⁺， Mn²⁺ and Fe³⁺） were introduced into the pulp before the addition of magnesium salts. The effects of Mg（OH）₂ on the pulp viscosity and Kappa numbers were studied. The results showed that Mg（OH）₂ with different particle sizes had no significant effects on Kappa number and lignin removal rate during oxygen delignification. However， the smaller particle size of Mg（OH）₂ had superior pulp viscosity protection ability than the bigger particle size. The smaller particle size of Mg（OH）₂ was added in oxygen delignification， the pulp had lower viscosity reduction and greater handsheet physical strength．