Metatitanic acid/urea‐formaldehyde microcapsules were synthesized to inhibit the erosion of gun barrel resulting from the propellant combustion. The microcapsules were prepared by one‐step in‐situ polymerization method. SEM and EDS were employed to characterize the morphology, core‐shell structure and the chemical composition of the microcapsules. FTIR spectra and XRD patterns confirmed the formation of crystalline urea‐formaldehyde resin on the surface of the metatitanic acid particle. TG results showed that the thermal decomposition residue weight ratio of the microcapsules in air was 12.8 %. Kinetic parameters of thermal decomposition of propellant with and without the microcapsules were calculated based on the DSC results, respectively, which proved the good compatibility between the microcapsules and the double‐base propellant. Erosion tube comparative test showed the wear‐reducing efficiency reached 18.54 % with 1.5 wt.% addition of microcapsules. The combination of metatitanic acid and urea‐formaldehyde resin surprisingly resulted in a synergistic effect, which was attributed to the better dispersibility of TiO₂ particles generated by metatitanic acid microcapsules. The metatitanic acid/urea‐formaldehyde microcapsules exhibit a potential application for propellant erosion additive.

中文翻译：

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偏钛酸/尿素甲醛微胶囊作为减磨添加剂的制备与表征

合成了偏钛酸/脲醛微胶囊以抑制由推进剂燃烧引起的枪管腐蚀。微胶囊是通过一步原位聚合法制备的。SEM和EDS用于表征微胶囊的形态，核壳结构和化学成分。FTIR光谱和XRD图谱证实了偏钛酸颗粒表面上结晶的脲醛树脂的形成。TG结果表明，微胶囊在空气中的热分解残留物重量比为12.8％。根据DSC结果分别计算了有和没有微胶囊的推进剂热分解动力学参数，证明了微胶囊与双基推进剂之间的良好相容性。侵蚀管比较试验表明，添加1.5 wt。％的微胶囊后，减磨效率达到18.54％。偏钛酸和脲醛树脂的组合出人意料地产生了协同效应，这归因于TiO更好的分散性_2个由偏钛酸微胶囊产生的颗粒。偏钛酸/脲甲醛微胶囊在推进剂侵蚀添加剂方面具有潜在的应用前景。