Preparation of multifunctional B/P flame retardant and its application on cotton fabric

The flammability of cotton fabric limits its application, so a new type of B/P flame retardant N–P ammonium salt pentaerythritol diboronate (N-PDBDPA) was prepared to improve the flame retardancy of cotton fabric. The configuration of surface and the diversification of surface elements were characterized by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy, and the results showed that N-PDBDPA were triumphantly grafted on the cotton fabric. The flame retardancy of the samples was investigated by limiting oxygen index (LOI) and vertical flame test. While the weight gain (WG) was only 10.08%, the LOI can reach 33.4% and the char residue length was 7.0 cm. The thermogravimetric results showed that the thermal stability of the cotton fabric was greatly improved by N-PDBDPA, and the char residue of Cot 10 was increased by 159% compared with that of pure cotton at 750 ℃. In addition, it can also enhance the tensile strength of the cotton fabric, increased by about 5%, and has excellent durability, which can pass the AATCC 1 A standard. At the same time, it can also give the cotton fabric smoke suppression performance under low WG. Finally, the possible degradation mechanism of treated samples was discussed.