As global regulations on per- and polyfluoroalkyl substances (PFAS) become increasingly stringent, fluorine-free flame retardancy has become an urgent demand in advanced manufacturing. Organosilicon flame retardants, boasting high efficiency, low smoke emission and environmental friendliness, are gradually replacing traditional fluorine-based additives, showing broad application prospects in materials such as polycarbonate (PC) and polyolefins, and becoming a focus of the industry. Divided into organic and inorganic categories, organosilicon flame retardants include silicone oil, silicone resin, polysiloxane and other types. Their core flame-retardant mechanism is forming a dense carbon layer to block heat and combustible gases, while featuring low smoke, low toxicity and no dripping. Industry giants such as Momentive and DowCorning have launched specialized products: Momentive's SFR series can synergistically flame retard and improve material mechanical properties, with XR31-B8092 also having anti-dripping function; Quansheng Technology's self-developed siloxane composite resin flame retardant can pass UL94 V0 certification and S2-level needle flame test at 1.5mm thickness. In PC material applications, organosilicon flame retardants solve the pain points of traditional phosphate-based additives (large dosage) and sulfonate-based additives (affecting transparency), achieving fluorine-free flame retardancy while maintaining high transparency. The Izod impact strength of new polysiloxane flame-retardant PC can reach 441J/m, three times that of brominated flame-retardant PC, with excellent recycling performance. In addition, new products such as polyhedral oligomeric silsesquioxane (POSS) further enhance material thermal stability, with decomposition temperature up to 600℃ and char yield exceeding 95%. Industry experts stated that organosilicon flame retardants not only meet current fluorine-free and environmental requirements but also improve material processing performance and mechanical properties. Their applications in polyolefins, cable materials and other fields will continue to expand, providing key technical support for China's advanced manufacturing industry.

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