Non-Chloride in Situ Preparation of Nano-Cuprous Oxide and Its Effect on Heat Resistance and Combustion Properties of Calcium Alginate

Abstract

With Cu2+ complexes as precursors, nano-cuprous oxide was prepared on a sodium alginate template excluded of Cl− and based on which the calcium alginate/nano-cuprous oxide hybrid materials were prepared by a Ca2+ crosslinking and freeze-drying process. The thermal degradation and combustion behavior of the materials were studied by related characterization techniques using pure calcium alginate as a comparison. The results show that the weight loss rate, heat release rate, peak heat release rate, total heat release rate and specific extinction area of the hybrid materials were remarkably lower than pure calcium alginate, and the flame-retardant performance was significantly improved. The experimental data indicates that nano-cuprous oxide formed a dense protective layer of copper oxide, calcium carbonate and carbon by lowering the initial degradation temperature of the polysaccharide chain during thermal degradation and catalytically dehydrating to char in the combustion process, and thereby can isolate combustible gases, increase carbon residual rates, and notably reduce heat release and smoke evacuation.

An Alginate Hybrid Sponge with High Thermal Stability: Its Flame Retardant Properties and Mechanism

“…The combustion behaviors of the samples were studied using CONE, which is an effective performance-based and bench-scale method to evaluate flammability through simulating real-world fire conditions [36][37][38]. As shown in Figure 6a, overall, the heat release rate (HRR) value of CAS was lower than that of CA, which was in favor of slowing down the fire spread.…”

Recent advances in metal-family flame retardants: a review

“…In addition to the signicant ame-retarding properties of metal hydroxides, metal oxides 38,39 also offer outstanding performance. 40 They are oen used as co-effectors, 41,42 with literature reporting special effects of transition metal oxides such as copper oxide, 43,44 nickel oxide 45 and so on. For example, Gogoi et al synthesised a vegetable oil alkyd resin with epoxy resin (EP) as the primary raw material from Jatropha curcas oil.…”

Simple and green synthesis of calcium alginate/AgCl nanocomposites with low-smoke flame-retardant and antimicrobial properties

“…As a renewable biomass, it is preferable for its intrinsic features including non-toxic, well degradability and biocompatibility (Das et al 2017;Googerdchian et al 2012;Lee and Mooney 2012), and thus it has attracted great interest in recent years (Li et al 2017a, b;Liu et al 2015a;Senturk Parreidt et al 2018). Based on these reports, calcium alginate (CA) has been proved to be a desirable material for applications in the textile industry (Agnieszka Kyzioł; Mokhena and Luyt 2017a) due to its inert nature and good flame retardant property, although its mechanism still needs to be clarified (Shao et al 2019;Wang et al 2015). Noticeably, the studies have shown that the limiting oxygen index (LOI) value of CA was around 34, which is limited as a desirable flame-retardant agent.…”