Organic-inorganic hybrid intumescent flame retardant coating (IFRC) has been manifested as a promising solution to prevent fire spread of the plywood for indoor decoration. The aliphatic waterborne polyurethane (AWP)-based IFRC is prepared using the silicon-based aerogel, β-cyclodextrin, and nano-ZnO as the functional filler, and its ultraviolet-aging deterioration mechanism on flame retardancy is investigated through microstructure characterizations and pyrolysis kinetic calculation. The results show that the flame-retarding and smoke-suppressing properties of the IFRC gradually deteriorate with the prolonged ultraviolet exposure from 6 to 60 cycles, evidenced by the reduced flame retardancy index of 0.19 (drops from 1.00), the rising fire growth index from 0.87 to 1.45 kW m⁻² s⁻¹, the increased average effective heat of combustion from 3.45 to 5.65 MJ·kg⁻¹, and the rising total smoke production from 91 to 153 m². Because the ultraviolet radiation favors the chain scission of AWP and cleavage of –HN-CO-, crystallization of Zn₃(PO₄)₂, ZnP₄O₁₁, and SiP₂O₇ for the IFRC during burning, leading to the reduced E_α of 330–150 ℃ (decreases by 20%) approximately, presenting a reduced water contact angle and a fluffy char. It preliminary seeks the ultraviolet-aging flame-retarding mechanism with quantitative techniques and explores the condensed flame-retarding mechanism further.

有机-无机混合膨胀型阻燃涂料（IFRC）已被证明是防止室内装饰胶合板火灾蔓延的有前途的解决方案。以硅基气凝胶、β-环糊精和纳米ZnO为功能填料制备了脂肪族水性聚氨酯（AWP）基IFRC，并通过微观结构表征和热解动力学研究了其对阻燃性的紫外老化劣化机制计算。结果表明，随着紫外线照射时间从 6 次延长到 60 次循环，IFRC 的阻燃和抑烟性能逐渐恶化，阻燃指数降低 0.19（从 1.00 下降）证明了这一点，火灾增长指数从 1.00 上升。 0.87 至 1.45 千瓦米^-2秒^-1，平均有效燃烧热从 3.45 MJ·kg ^-1增加到 5.65 MJ·kg ^-1，总产烟量从 91 增加到 153 m ²。由于紫外线辐射有利于 AWP 的断链和 -HN-CO- 的裂解，燃烧过程中 IFRC的 Zn ₃ (PO ₄ ) ₂、ZnP ₄ O ₁₁和 SiP ₂ O ₇结晶，导致 E 降低_α约330-150℃（降低20%），水接触角减小，炭化蓬松。用定量技术初步探索了紫外老化阻燃机理，进一步探索了凝聚型阻燃机理。