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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 NameAffiliationPostcode
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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