Abstract
A reactive flame retardant, diethylenetriamine phosphoramidite ammonium phosphoric acid (DETA-PAP), was synthesized for cotton fabrics. Phosphorus atoms were introduced into the flame retardant molecule through P(=O)–N covalent bonds. The P(=O)–N covalent bonds were stable yet not easily hydrolyzed due to p–π conjugation in the P(=O)–N group, and the polarization of N–P(=O)–O–C covalent bonds was relatively low, resulting in P(=O)–O–C covalent bond being stable as well. The Limiting oxygen index (LOI) values of cotton fabrics processed with 24 wt.% and 36 wt.% DETA-PAP after 50 cycles were 41.3% and 45.3%, respectively, according to the AATCC 61-2013 3A standard (strenuous washes). This shows that the cotton processed with DETA-PAP was both flame retardant and highly durable. The vertical flammability test, thermogravimetry, and cone calorimetry indicated that DETA-PAP-treated cotton displayed exceptional flame retardancy and that DETA-PAP underwent a condensed-phase flame-retardant mechanism. The EDS results revealed that DETA-PAP-treated cotton fabrics combined with fewer metal ions after washing than former flame retardants, confirming the high durability of DETA-PAP-treated cotton fabrics. DETA-PAP-cotton fabrics retained their whiteness, softness, and mechanical capabilities. All of the studies found that introducing P(=O)–N groups increased the durability of flame-retardant cotton fabrics significantly.
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Acknowledgments
The Petroleum and Chemical Industry Engineering Laboratory of Non-halogen Flame Retardants for Polymers, Beijing Technology and Business University, China, provided funding for this work through its Open Project Program (BTBUFR21-2).
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The Petroleum and Chemical Industry Engineering Laboratory of Non-halogen Flame Retardants for Polymers, Beijing Technology and Business University, China, provided funding for this work through its Open Project Program (BTBUFR21-2).
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YY: Formal analysis, Investigation, Data Curation, Writing-Original Draft. QT: Software, Investigation. SD: Investigation, Resources. YC: Research grant, Software. YL: Software, Formal analysis. YL: Methodology, Validation. GZ: Resources, Writing-Review & Editing.
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Yang, Y., Tang, Q., Diao, S. et al. Formaldehyde-free, high-durability flame retardant with phosphoramidite and reactive ammonium phosphoric acid for cotton fabrics. Cellulose 30, 10487–10501 (2023). https://doi.org/10.1007/s10570-023-05512-1
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DOI: https://doi.org/10.1007/s10570-023-05512-1