The bamboo can be a kind of important non-wood pulp used as paper resources, which has a short growth period, and is in a large reserve and with a low cost. But the bamboo pulp faces some problems, such as the low whiteness and the poor stability of the whiteness, the high yellow index, and it is difficult to deal with due to its high silicon content. In order to improve the bleachability, the whiteness and its stability and strength of the bambusa chungii APMP pulp, the hydrogen peroxide, the sodium borohydride, the sodium hydrosulfite, the peracetic acid and the oxygen are used as the bleaching agents in single stage or two stage combination supplementary bleaching. The results show that the best single stage supplementary bleaching of the bamboo chemi-mechanical pulp is the conventional hydrogen peroxide bleaching. Two supplementary bleaching experiments show that the greatest improvement of the whiteness is made by the combination of the hydrogen peroxide and the sodium hydrosulfite, with the whiteness being 73.85% ISO; the largest reduction of the viscosity is made by the combination of the hydrogen peroxide and the sodium borohydride, with the viscosity reduced from 960 mL·g-1 to 601 mL·g-1. Although the pulp viscosity is reduced after two supplementary bleachings, the physical strength is improved. The conjugated carbonyl content in the pulp is decreased with the use of the hydrogen peroxide, the combination of the hydrogen peroxide and the sodium hydrosulfite and the combination of the hydrogen peroxide and the sodium borohydride, but the content is increased with the use of the combination of the hydrogen peroxide and the peracetic acid. The most significant removal effect of methoxy, lilac lignin and condensation guaiacyl ring is produced by the combination of the hydrogen peroxide and the sodium hydrosulfite in the supplementary bleaching. The minimum degradation of the carbohydrates is produced by the hydrogen peroxide and the combination of the hydrogen peroxide and the sodium hydrosulfite in the supplementary bleaching.
QIN Chengrong
,
YAO Shuangquan
,
WANG Shuangfei
. Bleaching process and its mechanism for bamboo chemi-mechanical pulp[J]. Science & Technology Review, 2016
, 34(19)
: 76
-80
.
DOI: 10.3981/j.issn.1000-7857.2016.19.012
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