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A novel P/N-based flame retardant synthesized by one-step method toward cotton materials and its flame-retardant mechanism

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Abstract

A novel flame retardant containing phosphorus and nitrogen elements, ammonium salt of N,N-dimethylene p-benzenesulfonic phosphonic acid (ADBSPA), was prepared by one-step continuous chemical method. The chemical structure of the ADBSPA was determined by nuclear magnetic resonance spectrum (NMR) and Fourier transform infrared (FTIR), and ADBSPA was processed onto cotton materials by immersion method. The flame retardancy of coated cotton materials was analyzed by limiting oxygen index (LOI) and Vertical burning test. The LOI value of cotton coated with 350 g/L ADBSPA increased from the original 18.2 ± 0.2% to 31.7 ± 0.2%, and the damaged length of this sample reduced to 6.6 ± 0.1 cm, which proved that ADBSPA enhanced the anti-burning ability of cotton materials. Cone calorimetry was used to evaluate the combustion behavior of cotton materials before and after coating. Compared with original sample, ADBSPA changed the combustion path of cotton materials, and the intuitive performance was that the ADBSPA-cotton-4 reserved 25.1 ± 0.5% of char residue at 250 s, and its peak heat release rate (PHRR) greatly reduced to 17 ± 1 kW/m2. The surface morphology of uncoated and coated cotton materials was characterized by scanning electron microscopy (SEM). It was observed that the coated sample still maintained a complete fiber skeleton after burning. In addition, thermogravimetric (TG) analysis confirmed that the coated cotton materials had good thermo-oxidative and thermal stability. All results pointed out that the phosphorus and nitrogen elements contained in ADBSPA as well as cotton cellulose constituted the three basic conditions of intumescent flame-retardant system. The polyphosphoric acid compounds formed by phosphorus element at high temperature promoted the dehydration of cotton fibers into char layer. The non-flammable gases produced by the nitrogen element in the combustion process covered the surface of fabrics, thereby playing the role of shielding heat and diluting combustible gases.

Graphic abstract

A novel phosphorus-nitrogen flame retardant was prepared by one-step continuous chemical method and applied to improve the thermal stability and anti-flammability of cotton materials.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 22075158), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2020ME064), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2018MEM026) and the State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University (Grant No. ZFZ201818).

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Authors and Affiliations

  1. College of Textile and Clothing, College of Chemistry and Chemical Engineering, State Key Laboratory of Bio-Fibers and Eco-Textiles, Institute of Functional Textiles and Advanced Materials, Qingdao University, Qingdao, 266071, People’s Republic of China

    Ling Sun, Yutong Xie, Jiamin Wu, Huixin Wang, Shihao Wang, Wennan Li, Jiaojiao Zhang, Zheng Zhang, Ping Zhu, Zhou Lu & Chaohong Dong

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  1. Ling Sun
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  2. Yutong Xie
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  3. Jiamin Wu
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  4. Huixin Wang
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  5. Shihao Wang
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  6. Wennan Li
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  7. Jiaojiao Zhang
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  9. Ping Zhu
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  10. Zhou Lu
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  11. Chaohong Dong
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Correspondence to Chaohong Dong.

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Sun, L., Xie, Y., Wu, J. et al. A novel P/N-based flame retardant synthesized by one-step method toward cotton materials and its flame-retardant mechanism. Cellulose 28, 3249–3264 (2021). https://doi.org/10.1007/s10570-021-03728-7

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