竹龄对竹材化学成分及制浆造纸性能的影响

Effects of Bamboo Growth-age on Its Chemical Components and Kraft Pulping Performance

关键词:  竹龄  竹浆  化学成分  硫酸盐制浆

Key Words:bamboo growth-age  bamboo pulp  chemical component  kraft pulping

摘要:以3种竹龄竹材为原料，研究了竹龄对竹材化学成分的影响，并进行了竹材硫酸盐法蒸煮和竹浆的筛分、打浆实验，研究了竹龄对竹材制浆及手抄片性能的影响。结果表明，竹材的综纤维素，冷水、热水和1% NaOH抽出物含量随竹龄的增长逐渐减小；苯-醇抽出物含量随竹龄的增长变化不大； Klason木质素、酸溶木质素及总木质素含量随竹龄的增长呈增加趋势。在相同的制浆工艺条件下，黑液中木质素含量随竹龄的增长逐渐增加；竹材细浆得率、竹浆白度、黑液中残碱含量随竹龄的增长逐渐减小；蒸煮粗渣率、竹浆卡伯值随着竹龄的增长逐渐增加。相同打浆度下，1年生和2年生竹材所抄纸张的抗张指数、耐破指数相近，均大于4年生竹材，纸张的撕裂指数和耐折度随竹龄的增长逐渐减小。

Abstract:Using three kinds of growth-ages of Dendrocalamus latiflorus Munro as raw materials， the effect of growth-age on chemical components was analysized， and their pulping performances and handsheet properties were evaluated by kraft cooking， sieving， and pulping experiments. The results showed that the holocellulose content， extractives contents （cold water， hot water， and 1% NaOH solution） of bamboo chips gradually decreased with growth-age. The content of benzyl alcohol extractive decreased slightly with growth-age. The contents of Klason lignin， acid soluble lignin， and total lignin increased with growth-age. The lignin concentration in the black liquor gradually increased with growth-age under the same pulping conditions. The screened pulp yield， the pulp brightness， and the content of residual alkali in the black liquor gradually decreased with growth-age. The cooking crude residue rate and the Kappa number of pulp gradually increased with growth-age. Under the same level of beating degree， the tensile index and bursting index of handsheets of 1-year-old and 2-year-old bamboo pulps were similar and greater than those of 4-year-old bamboo pulp. The tear index and folding endurance of paper gradually decreased with growth-age.