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TMP长纤维改性机理及应用技术研究
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摘要
机械浆改性是进一步提高机械浆质量的有效途径。本课题探讨了TMP长纤维的改性机理及应用技术,为提高机械浆的强度及扩大机械浆的应用范围奠定理论基础。
     1.碱性过氧化氢处理(AP) TMP长纤维组分能明显降低浆中抽出物含量,纤维表面产生大量的羧基;过氧化氢用量的变化对白度影响较为明显;碱的作用是使细胞壁结构变得松弛,随着用碱量的增加,抽出物含量明显降低,羧基含量大幅度增加,纤维表面O/C比也略有增加,各项强度均增加。
     2.碱性过氧化氢处理机械浆长纤维,并进行打浆,可以获得很好的结果,实验证明:氢氧化钠促进物理强度的提高,而过氧化氢则带来光学性能的改善。温度和时间对AP处理结果的影响不明显。
     3.TEMPO为介质的氧化改性处理可以使抗张强度和耐破强度两项指标分别增加4.3倍和3.4倍。如果TEMPO氧化处理和碱性过氧化氢处理过程协同作用,将取得更高的强度性能。TEMPO处理后的浆更容易打浆。
     4.将保留在48目以上的jack松TMP长纤维分离,进行碱性过氧化氢处理,并进行轻微的打浆,再与分离出来的短纤维组分重新混合,得到的浆料抄纸性能完全达到新闻纸的国家标准。因此,jack松TMP长纤维碱性过氧化氢改性具有很好的应用性能。
The modification of mechanical pulp is one of effective method to further improve its quality. In this paper, the modification mechanism and application technology of TMP long fiber are studied. It lays the foundation for enhancing the quality and enlarge the application of mechanical pulp.
     1. After treated by alkaline peroxide, the extractive in jack pine TMP long fiber decreased evidently, its surfaces produced large numbers of carboxyl. The H2O2 dosage in AP treated process had evident effect on brightness of sheet. The action of alkali in AP process is to make structure of cell wall loose. With the alkali dosage increasing, the extractive content decreased greatly, carboxyl content increased significantly, the O/C ratio of fiber surface increased slightly, at the same time, its physical properties increased.
     2. Alkaline peroxide treatment of TMP long fibres followed beating yielded excellent physical and optical characteristics. The results indicated that NaOH had positive effect on the physical properties, H2O2 evidently influenced the optical properties, while the treatment temperature and time did not significantly affect the sheet characteristics.
     3. TEMPO-mediated oxidation (TOX) is particularly effective in promoting tensile and burst indices which can be increased by 4.3 and 3.4 times, respectively. When the TOX is in combination with AP yielded higher physical properties. The TOX pulp has greater beatability than the AP counterpart did.
     4. Beating alkaline peroxide treated long fibers mixed with separated short fibers (≤R100), which can produce the handsheet met the Newsprint Standard of China. It is concluded that AP process plus refining have great potential in enhancing the quality of jack pine mechanical fibres, which may indeed represent a breakthrough in jack pine TMP improvement.
引文
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