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- Title
Reactive ammonium phosphite flame retardant in improving the flame retardancy of air filter paper.
- Authors
Cheng, Yang; Hui, Lanfeng; Li, Ming; Gao, Yang; Zhao, Mingyue; Chen, Zhixian; Zhao, Juan
- Abstract
To reduce the fire risk of air filter paper, a reactive ammonium phosphite flame retardant was synthesized and applied to the flame-retarding treatment of air filter paper. It was found that ammonium phosphite reacted with cellulose existing in filter paper fibers to form P–O–C bonds and remarkably improved the flame-retarding properties and thermal stability of the air filter paper. After modification of the air filter paper with 30 wt% of ammonium phosphite, its limiting oxygen index value reached 39.5%, which remained at 29.6% after 4 h of the dipping test. The heat release rate and total heat release rate of the treated air filter paper decreased significantly, and the carbon residual amounts at 700 °C in the nitrogen atmosphere and in air reached 43.96% and 16.35%, respectively. During thermal decomposition, ammonium phosphite played a flame-retarding role in both condensed and gas phases. Moreover, ammonium phosphite, as a flame retardant, had no obvious influence on the physical properties and filtration performance of the air filter paper.
- Subjects
FIREPROOFING; AIR filters; FIREPROOFING agents; FILTER paper; HEAT release rates; AMMONIUM; CELLULOSE nanocrystals
- Publication
Cellulose, 2023, Vol 30, Issue 10, p6571
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-023-05262-0