红麻硫酸盐浆H_2O_2漂白及纸基地膜白度的研究

H2O2-bleaching of stalk kenaf mulch film and brightness of mulch film

对用于抄造纸基地膜的红麻全秆硫酸盐浆的H2O2漂白工艺进行了探讨。实验结果表明,单段过氧化氢对红麻原浆漂白的最佳工艺条件为:H2O23%,碱比1,时间1 h,温度70℃,DTPA 0.25%,MgSO40.05%,Na2SiO33%,浆浓10%。在该漂白条件下漂白所得的浆料,卡伯值从原浆的23.05降低到6.6,黏度由1 605 mL/g降低到1 331.33 mL/g,白度从原浆的20.2%ISO提高到56.3%ISO。经过实验进一步分析,纸基地膜的最佳白度为55%ISO^60%ISO。红麻全杆硫酸盐浆单段过氧化氢漂白后所达到的白度(56.3%ISO)完全满足抄造红麻纸基地膜的白度要求。

The H2O2 bleaching of the stalk kenaf mulch film was studied. The bleaching condition was optimized as follow： consistency 10%, H2O2 3%, ratio of NaOH to H2O2 1.0, 70 ℃, 1 h, DTPA 0.25%, MgSO4 0.05%, Na2SiO3 3%. Better results were obtained when bleached at the optimum condition as： brightness from 20.2% to 56.3% ISO, kappa value from 23.05 to 6.6 and viscosity from 1 605 mL/g to 1 331.33 mL/g. Because the requirement on the brightness of paper mulch film is 55%-60% ISO, the obtained brightness （56.3% ISO） of kenaf pulp is enough.