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| Study on Microencapsulation of Ammonium Polyphosphate and Preparation of Hydrophobic Flame Retardant Paper |
| Received:December 19, 2022 |
| DOI：10.11980/j.issn.0254-508X.2023.10.006 |
| Key Words:ammonium polyphosphate sol-gel method microencapsulation flame retardant hydrophobicity |
| Author Name | Affiliation | Postcode | | PAN Ruidong* | School of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018 | 310018 | | YAO Zhiwei | Zhejiang Smith Special Paper Co., Ltd., Quzhou, Zhejiang Province, 324022 | 324022 | | ZHANG Yu | Zhejiang Jinchang Specialty Co., Ltd., Quzhou, Zhejiang Province, 324400 | 324400 | | MENG Yu | Zhejiang Jinchang Specialty Co., Ltd., Quzhou, Zhejiang Province, 324400 | 324400 | | LI Yao | School of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018 | 310018 | | WANG Zhangyi | School of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018 | 310018 | | XIA Xinxing | School of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province, 310018 | 310018 |
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| Abstract:In this study， tetraethoxysilane （TEOS） and methyltriethoxysilane （MTES） were used as precursors to modify ammonium polyphosphate （APP） by sol-gel method， and then hydrophobic flame retardant paper was prepared by in-pulp addition method. The results showed that APP was a square particle with smooth surface and had strong hydrophilicity and electronegativity. Under alkaline condition， TEOS and MTES together formed a dense rough silica shell to encapsulate APP. When 6% MTES was added， the average particle size of the microencapsulated APP increased from 23.98 μm to 28.52 μm， the water contact angle increased from 13.5° to 97.7°， indicating that changed from hydrophilicity to hydrophobicity， and the Zeta potential decreased from -67.5 mV to -45.8 mV with the negative charge decreased. Compared with the paper with 40% APP， the Cobb value of the paper with 40 % microencapsulated APP decreased from 61.7 g/m2 to 27.2 g/m2， and the limiting oxygen index （LOI） increased from 27.1% to 31.8%. The flame retardancy and hydrophobic properties were significantly improved， reaching the flame-retardant level. |
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