二水合草酸镍对太根药热分解催化的影响

Catalytic Effect of NiC_2O_4·2H_2O on Thermal Decomposition of TEGDN/NC Propellant

以硝酸镍和草酸为反应物,通过液相共沉淀法制备得到了二水合草酸镍(NiC2O4.2H2O),利用X射线衍射(XRD)、扫描电镜(SEM)、激光粒度仪、元素分析、傅里叶红外光谱(FT-IR)和热分析(TG-DTG)实验对产物进行了表征和分析,并通过热分析-质谱(TG-MS)联用技术研究了其对太根药热分解催化的影响。结果发现,产物结构中含有两个结晶水,化学式为NiC2O4.2H2O。产物分散性较好,平均粒径为15.97μm。TG-DTG实验发现,NiC2O4.2H2O在180～250℃范围内失去两个结晶水,继续升温则发生无水草酸镍的分解反应。TG-MS结果显示,加入2%的NiC2O4.2H2O可促进太根药的热分解过程,并加快热分解气体产物的生成。对气体产物的离子流强度曲线进行积分,发现催化剂的加入明显增加了气体产物中HCHO的含量。

Nickel oxalate dihydrate（NiC2O4·2H2O） was prepared by coprecipitation method using nickel nitrate and oxalic acid as the raw materials.The product was characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,laser granularity measurement device,elemental analysis,Fourier transform infrared（FT-IR） spectrometry and TG-DTG analysis.Its catalytic effect on the thermal decomposition of TEGDN/NC propellant was studied via thermogravimetry-mass（TG-MS） coupling technique.The results show that the product contains crystal water,and its molecular formula is NiC2O4·2H2O.The product has good dispersion and its average particle size is 15.97 μm.NiC2O4·2H2O loses crystal water at the range of 180-250 ℃ and then decomposes at higher temperature.TG-MS analysis shows that adding 2% NiC2O4·2H2O can accelerate the thermal decomposition of TEGDN/NC propellant and accelerate the generation of gaseous products.The integral intensities of ion currents were calculated,and it is found that the generation amount of HCHO is obviously increased during the thermal decomposition process.