Green P–N coating by mechanochemistry: efficient flame retardant for cotton fabric

Green biobased P‐N coating: Towards waste‐minimization flame retardant flexible polyurethane foam

“…Due to the absence of hard segments, the compress stress of FPUF was only 0.0044 MPa when it was compressed to 45%. However, the compress stress of FPUF@LFPN was increased from 0.0044 to 0.0052 MPa, indicating the LFPN with a rigid structure can improve the compression resistance of FPUF 21,54 . The four times cyclic stress–strain (CS) curve for FPUF@LFPN was shown in Figure 6B, meaning the anti‐compress capacity of FPUF@LFPN had no loss after several times tests.…”

“…SEM images of char residues after CCT for FPUF (A) and FPUF@LFPN (B, C); EDS mapping image of char residues after CCT for FPUF@LFPN (D); FTIR spectra of gaseous products for FPUF (E) and FPUF@LFPN (F); XPS high-resolution C1s (G), P2p (H) spectra of char residues after CCT for FPUF@LFPN; the proposed flame-retardant mechanism (I) excellent char forming property can decompose rapidly and promote the formation of the char layer. 21 Moreover, LFPN decomposes to form phosphoric acid, metaphosphoric acid, and other pyrophosphoric acid derivatives, which could interact with matrix to form the compact and continuous char residues layer containing aromatic phosphor carbonaceous structure. On the one hand, the high-quality char residues layer prevents flammable gas from entering the combustion zone.…”

“…[18][19][20] Nevertheless, such biomass char-forming agents usually need functionalization modification to improve their flame retardancy efficiency, and the modification process often requires many harmful substances and organic solvents. [21][22][23] It is evident that the above process will lead to new environmental pollution problems.…”

“…Recently, natural biomass polymers, including chitosan, cellulose, and alginate, have been widely used to manufacture flame‐retardant coatings due to environmental friendliness and superior char‐forming properties 18–20 . Nevertheless, such biomass char‐forming agents usually need functionalization modification to improve their flame retardancy efficiency, and the modification process often requires many harmful substances and organic solvents 21–23 . It is evident that the above process will lead to new environmental pollution problems.…”

“…36 Zhang et al 3 reported that few-layered Co(OH) 3 could improve the fire safety performance of polyurethane and catalyze polyurethane into Co/CNT composites with the condition of 600 C for 6 h. Wang et al 37 In our previous work, mechanochemistry synthesized a novel green lignocellulosic P-N coating (LFPN), which endows the cotton fabric with excellent flame retardancy and mechanical properties. 21 Moreover, LFPN is a potential transition metal adsorbent due to its rich hydroxyl and ammonium. Unlike cotton fabrics, which can be treated by surface grafting, the surface of the FPUF foam skeleton is chemically inert, making it difficult for LFPN to cover its surface.…”