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Study on Modification of Pulp Fiber and Its Performance for the Preparation of Mask Filter Materials
Received:March 22, 2023  
DOI：10.11980/j.issn.0254-508X.2023.05.013
Key Words:pulp fiber  modification  mask filter materials  filtration efficiency
Author NameAffiliationPostcode
LU Dongyan* College of Materials Science and Engineering, Northeast Forestry University, Harbin, Heilongjiang Province, 150040 150040
DING Wei Zhejiang Zhefeng New Materials Co., Ltd., Changshan, Zhejiang Province, 324200 324200
LI Zhiqiang College of Materials Science and Engineering, Northeast Forestry University, Harbin, Heilongjiang Province, 150040 150040
WU Hongye College of Materials Science and Engineering, Northeast Forestry University, Harbin, Heilongjiang Province, 150040 150040
LYU Xiaohui College of Materials Science and Engineering, Northeast Forestry University, Harbin, Heilongjiang Province, 150040 150040
LIU Wenbo College of Materials Science and Engineering, Northeast Forestry University, Harbin, Heilongjiang Province, 150040 150040
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Abstract:Needle-leaf bleached kraft pulp （NBKP） and leaf bleached kraft pulp （LBKP） were used as raw materials and modified with NaOH/urea/thiourea solvent system at low temperature， through synergistic pulping treatment to obtain the fibers that properly fibrillated while maintaining the overall form. The prepared fibers were used for manufacturing the mask filter materials. By testing the structural parameters and performance of the filter materials such as thickness， pore size and air permeability， and comparing with the commercially available PM2.5 protective mask filter materials， to investigate the optimum modification process of pulp fiber and papermaking ratio. The results showed that the performance indexes of the filter materials prepared from modified NBKP with degree of 18 °SR and LBKP with degree of 20 °SR were closest to the reference target， of which the ratio of NBKP and LBKP was 2∶8. At this conditions， the bulk thickness of filter material was 4.36 cm3/g， the air permeability was 287.19 L/ （m2∙s）， the average pore size was 36.69 μm， the maximum pore size was 39.86 μm， and the filtration efficiency was 99%.
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