加填对高得率浆性能的影响

Effects of Inorganic Fillers on the Properties of Bleached High Yield Pulp

中文关键词:  高得率浆  加填  填料留着量  纸张强度性能  返黄

Key Words:high yield pulp  paper filling  filler retention amount  paper strength property  brightness reversion

中文摘要:

      探讨了分别加填TiO₂和CaCO₃对漂白高得率浆成纸强度性能和光学性能的影响。加填后,成纸抗张强度、耐破度和层间结合强度均有不同程度的降低。与CaCO₃加填纸相比,TiO₂加填纸的强度性能降低幅度较小。加填TiO₂可显著提高纸张的白度、不透明度和光散射系数。加填纸光散射系数相同时,TiO₂用量仅为CaCO₃用量的1/4。加填TiO₂可显著抑制高得率浆光诱导返黄,并且随其留着量的增加,抑制效果增强；TiO₂留着量为21.4%,加填纸光诱导返黄程度降低76.4%。加填CaCO₃对漂白高得率浆的光诱导返黄的抑制作用较小。

Abstract:

      The effects of TiO,sub>2 and CaCO₃ as fillers on the strength and optical properties of bleached high yield pulp (HYP) were investigated. It was shown that the tensile strength, bursting strength and bonding strength of the handsheets from HYP decreased in different degrees with the increment of the fillers. Comparing with the CaCO₃, the sheet strength decreased smaller when TiO₂ was used as filler. And the brightness, opacity and especially the light scattering coefficient of the TiO₂-filled sheets were improved obviously. The same light scattering coefficient was obtained when the dosage of TiO₂ was only one fourth of that of CaCO₃. Furthermore, an obvious inhibition of brightness reversion of HYP was achieved by TiO₂ filling, and the inhibition effect on brightness reversion increased with the increment of TiO₂. The HYP brightness reversion was reduced by 76.4% when the TiO₂ retention amount was 21.4%. Comparatively, the inhibition effect on the brightness reversion was weak for CaCO₃ filling．