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| Study on Modification and Application of Fine Components in Wheat Straw Chemi-mechanical Pulp |
| Received:April 07, 2023 |
| DOI：10.11981/j.issn.1000-6842.2023.03.144 |
| Key Words:wheat straw chemi-mechanical pulp;impurities and fine components;graft modification;acrylic acid |
| Fund Project:国家自然科学基金资助项目（31370583）。 |
| Author Name | Affiliation | Postcode | | ZHOU Pingyan* | College of Light Industry and Food Science, Collaborative Innovation Center for Efficient Processing and Utilization of Forestry Resources in Jiangsu Province, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037 | 210037 | | JING Yi | College of Light Industry and Food Science, Collaborative Innovation Center for Efficient Processing and Utilization of Forestry Resources in Jiangsu Province, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037 | 210037 | | FANG Guigan | Institute of Chemical Industry of Forest Products, CAF, Nanjing, Jiangsu Province, 210037 | 210037 |
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| Abstract: |
| Wheat straw chemi-mechanical pulp is an important fiber raw material for papermaking， but its high content of fine components （components passing through 200 mesh ） not only leads to a decrease in the drainage performance of the pulp， but also reduces the surface strength of the paper， thereby limiting the large-scale application of wheat straw chemi-mechanical pulp. This study uses the Bauer sieve to screen out the fines， and uses the DOE Taguchi experimental design method to study the changes in the grafting modification of acrylic acid （AA） on the fines. A comparative analysis is conducted on the fiber morphology， water filtration performance， and the impact of blending on paper performance before and after the modification of the fines. Research has found that the optimal modification process conditions are as follows： the amount of cerium ammonium nitrate potassium persulfate （molar ratio 1∶1） composite initiator is 1 mmoL； the initiation time is 20 minutes； the temperature is 50℃； the amount of grafting monomer AA is 4 mL； the reaction time is 3 hours， so that the grafting efficiency reaches 85.31% and the grafting rate is 69.50%. After modification， the number average length， weight average length， and width of AAMF increased by 2.06%， 2.78%， and 45.28%， respectively. The percentage content of fines decreased by 19.62%； The water retention value has increased by 13 times. By blending unmodified fines and AAMF with R28 （remained 28 mesh） components of wheat straw chemi-mechanical pulp， it was found that compared with unmodified fines， adding AAMF can improve the water filtration performance of wheat straw pulp， the tear and tensile strength of the paper. |
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