Abstract The main objective of the present work was to develop intumescent fire-retardant coating (IFRC) for wood based on modified natural rubber (NR). A newly modified form of NR, namely graft copolymers of NR and poly(methacrylic acid) (PMAA), NR-g-PMAA, was first synthesized by a solution polymerization technique. The IFRC was then prepared by compounding the synthesized NR-g-PMAA with a curing agent and an intumescent additive to form a compound coating. Cross-linking of the NR-g-PMAA coating was achieved by reactions with polyisocyanate based on hexamethylene diisocyanate (poly‐HDI) under ambient conditions. Interactions of NR-g-PMAA with poly‐HDI were also studied using X-ray photoelectron spectroscopy. Expandable graphite (EG) was employed as intumescent filler in the present study. The thermal stability of the NR-g-PMAA coating films was first studied by thermogravimetric analysis. The fire-retardant properties of wood, with or without the NR-g-PMAA coating, were then examined using the limiting oxygen index and cone calorimetry test. The flammability tests indicate that the flame-retardant properties of wood were greatly improved by treatment with the NR-g-PMAA-based IFRC. Hence, it can be stated that this new form of modified NR has shown to possess potential application in the IFRC when used in combination with EG.

中文翻译：

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基于具有甲基丙烯酸官能团的天然橡胶的防火木器涂料

摘要 目前工作的主要目标是开发基于改性天然橡胶 (NR) 的木材膨胀型防火涂料 (IFRC)。NR 的新改性形式，即 NR 和聚（甲基丙烯酸）（PMAA）的接枝共聚物，NR-g-PMAA，首先通过溶液聚合技术合成。然后通过将合成的 NR-g-PMAA 与固化剂和膨胀添加剂混合以形成复合涂层来制备 IFRC。NR-g-PMAA 涂层的交联是通过在环境条件下与基于六亚甲基二异氰酸酯 (poly-HDI) 的多异氰酸酯反应实现的。还使用 X 射线光电子能谱研究了 NR-g-PMAA 与聚 HDI 的相互作用。在本研究中采用可膨胀石墨 (EG) 作为膨胀填料。首先通过热重分析研究了 NR-g-PMAA 涂层膜的热稳定性。然后使用极限氧指数和锥形量热法测试木材的阻燃性能，无论有无 NR-g-PMAA 涂层。可燃性测试表明，用基于NR-g-PMAA 的IFRC 处理后木材的阻燃性能大大提高。因此，可以说，当与 EG 结合使用时，这种新形式的改性 NR 已显示出在 IFRC 中的潜在应用。可燃性测试表明，用基于NR-g-PMAA 的IFRC 处理后木材的阻燃性能大大提高。因此，可以说这种新形式的改良 NR 在与 EG 结合使用时已显示出在 IFRC 中的潜在应用。可燃性测试表明，用基于NR-g-PMAA 的IFRC 处理后木材的阻燃性能大大提高。因此，可以说这种新形式的改良 NR 在与 EG 结合使用时已显示出在 IFRC 中的潜在应用。