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| Optimization of Preparation Process and Performance Study of Broussonetia papyrifera Bark Fiber Insulating Paper |
| Received:October 11, 2025 Revised:October 31, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.04.001 |
| Key Words:Broussonetia papyrifera bark insulating paper electrical properties |
| Fund Project:教育部基础学科和交叉学科突破计划（JYB2025XDXM412）。 |
| Author Name | Affiliation | Postcode | | ZHANG Tian* | 1School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | LI Junrong | 1School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | CUI Huize | 2China Electric Power Research Institute, Beijing, 100192 | 100192 | | GU Wenwen | 2China Electric Power Research Institute, Beijing, 100192 | 100192 | | ZHANG Chong | 2China Electric Power Research Institute, Beijing, 100192 | 100192 | | QIAN Liying* | 1School of Light Industry and Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 |
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| Abstract:To investigate the feasibility and application potential of using non-wood fibers for electrical insulating paper， this study used Broussonetia papyrifera bark fiber as raw material， and prepared Broussonetia papyrifera bark paper via alkali-anthraquinone pulping and acid/magnesium salt purification. The process parameters were optimized， including cooking alkali concentration， purification conditions， and refining degree. Furthermore， the insulating paper based on Broussonetia papyrifera bark fiber was prepared by impregnation with insulating oil， and its electrical insulation properties， such as breakdown strength and dielectric loss， as well as its aging performance， were evaluated. The results showed that under the conditions of NaOH concentration of 19 g/L， liquor-to-solid ratio of 1∶15， and cooking at 140 ℃ for 2 h， the pulp yield reached 36.5%， with relatively low ash and lignin contents. After purification with 5% hydrochloric acid， the ash content decreased to 0.23%， and the Na+ content was reduced to 13.7 mg/kg. After treatment with 2% magnesium bicarbonate， the pH value of the pulp extract solution reached 7.1 and the conductivity decreased to 44.0 µS/cm. When the refining degree was 83 °SR， the AC and DC breakdown strengths of the insulating paper made from NaOH-cooked Broussonetia papyrifera bark pulp reached 157 and 279 kV/mm， respectively. Its dielectric loss tangent at the power frequency of 50 Hz was 0.40%， comparable to that of commercial insulating paper made from softwood. After aging in insulating oil at 105 ℃ for 30 days， the degree of polymerization of the Broussonetia papyrifera bark fiber insulating paper decreased from 1 755 to 1 471， indicating good thermal stability. |
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