Abstract
The traditional proban finishing technology can impart cotton fabrics with excellent flame retardance and durability. However, the technology is complex and needs special equipment. Especially ammonia fumigating technology is not friendly to the environment. Then, in this paper, this technology was improved. The bis[tetrakis(hydroxymethyl)phosphonium] sulfate (THPS) was pre-polymerized with urea, and the cotton fabrics were grafted with 2,3, 2′3′-biglycidyl diethylene triamine (BGDETA) to impart cellulose N–H groups. And then, the prepolymer was grafted on cotton fabrics through pad-dry-curing technology. The improved finishing technology did not need ammonia fumigating. The BGDETA and the pre-polymerized THPS structures were characterized by nuclear magnetism test (NMR). The vertical flammability, thermogravimetric analysis (TG), and conical calorimetry tests showed the excellent flame retardance of finished cotton fabrics. The 20%, 30%, and 40% treated cotton fabrics had limiting oxygen index values (LOIs) of 27.0%, 29.4%, and 31.2%, respectively. After 50 laundering cycles, according to NFPA2112-2012 Standard, the LOIs were 25.1%, 28.8%, and 29.7%. The Fourier transform infrared spectroscopy test (FTIR) and scanning electron microscope (SEM) showed the flame retardant entered the inner space of the cotton fibers; the X-ray diffraction (XRD) results showed the cotton fibers’ structure was well sustained; the mechanical property and whiteness were kept well. The formaldehyde of finished cotton fabrics could decrease to 40.6 ppm after being treated with H2O2. The results showed that the improved finishing technology could replace the traditional finishing technology; the improved finishing technology is easy to carry out and still get excellent flame retardance and durable cotton fabrics.
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Acknowledgments
This work was supported by the “Natural Funds for Chongqing” (cstc2019jcyj-msxmX0412) and the “National Natural Science Foundation of China” (Grant No. 21905233).
Funding
This work was supported by the “Natural Funds for Chongqing” (cstc2019jcyj-msxmX0412) and the “National Natural Science Foundation of China” (Grant No. 21905233).
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SD: Formal analysis, Investigation, Data Curation, Writing—Original Draft. YY: Software, Investigation. QT: Investigation, Resources. YL: Software, Formal analysis. YL: Methodology, Validation. GZ: Resources, Writing—Review & Editing.
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Diao, S., Yang, Y., Tang, Q. et al. Improvement of traditional proban flame retardant finishing technology for cotton fabric. Cellulose 30, 6051–6063 (2023). https://doi.org/10.1007/s10570-023-05226-4
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DOI: https://doi.org/10.1007/s10570-023-05226-4