柠条APMP浆漂白特性的研究

Bleaching Characteristics of Caragana Korshinskii APMP Pulp

目的研究柠条APMP浆H_2O_2单段、两段以及H_2O_2-Na_2S_2O_4两段的漂白特性。方法研究H_2O_2单段漂中H_2O_2用量、温度和反应时间,以及两段漂中H_2O_2和Na_2S_2O_4的用量对漂后纸浆成纸的白度和各项物理性能影响,了解柠条APMP浆的漂白特性。结果得到了柠条APMP浆H_2O_2单段漂的最佳工艺条件,H_2O_2质量分数为5.0%,温度为80℃,时间为90 min。在该条件下,纸浆的白度从47.71%提高到64.87%,白度提高了36%,且成纸的抗张强度、耐破强度和撕裂强度都得到提高。在H_2O_2用量一定的条件下,柠条APMP浆H_2O_2两段漂的效果优于H_2O_2单段漂;H_2O_2-Na_2S_2O_4两段漂后纸浆的白度较H_2O_2单段漂虽有所提高,但漂后浆成纸的结合强度均低于H_2O_2单段漂。结论柠条APMP浆可以采用H_2O_2单段和两段漂,其中H_2O_2两段漂的效果优于单段漂。

The paper aims to study the bleaching characteristics of caragana korshinskii APMP pulp with single-stage, two-stage H2O2 and two-stage H2O2-Na2S2O4. The bleaching characteristics of Caragana Korshinskii APMP pulp and the effects of the dosage of H2O2, reaction temperature and time in single H2O2 bleaching and the dosage of H2O2 and Na2S2O4 in two-stage bleaching on the brightness and physical properties of bleached pulp were investigated. The optimum condition of single-stage H2O2 bleaching was as follows: the dosage of H2O2 was 5.0%, the bleaching temperature was 80 ℃, and the bleaching time was 90 min. Under these conditions, the whiteness of pulp increased from 47.71% to 64.87%, whiteness increased by 36% and the tensile strength, burst strength and tear strength of paper were also improved. The effect of twostage bleaching of Caragana Korshinskii APMP pulp was better than that of single-stage bleaching under the condition of a certain amount of H2O2.The whiteness of pulp after two-stage bleaching of H2O2-Na2S2O4 was higher than that of singlestage H2O2 bleaching, but the bonding strength of pulp was lower than that of single-stage H2O2 bleaching. Caragana Korshinskii APMP pulp could be bleached with single-stage and two-stage H2O2. The effect of two-stage H2O2 is better than that of single-stage H2O2.