包覆赤磷的制备及其热安定性研究

Study on the preparation and thermal stability of microencapsulated red phosphorus

为提高赤磷(RP)的热安定性,采用氢氧化铝-酚醛树脂包覆赤磷,并用傅里叶变换红外光谱仪和扫描电子显微镜对包覆层进行表征,通过差热分析方法对包覆前后的赤磷样品进行热分析.研究结果表明:包覆赤磷(MRP)的氧化起始温度、氧化峰值温度及氧化终止温度分别提高34.0、36.0、35.0℃;410℃下的恒温热重分析测得未包覆赤磷在恒温约4 min氧化完成,而包覆赤磷在恒温13 min仅有45.5%的赤磷被氧化;包覆赤磷的氧化放热峰温后移34.0℃;计算得出包覆赤磷的自发火温度提高14.39 K.相比于未包覆赤磷,包覆赤磷的热安定性有所提高,且包覆材料很好地包覆在赤磷表面.

To improve the thermal stability of red phosphorus, the Microencapsulated Red Phosphorus （MRP） was successfully obtained by coating red phosphorus with aluminium hydroxide/Phenol formaldehyde resin. The coating layer of red phosphorus was characterized by FTIR and SEM, and its thermal stability was determined by Thermogravimetric Analysis （TGA）, Differential Thermal Analyser （DTA） and Isothermal Thermogravimetric analysis （ITG）. The results indicates that the initial, peak and end temperatures of the microencapsulated red phosphorus increase by 34.0, 36.0, 35.0℃ respectively compared to Red Phosphorus （RP）. Isothermal Thermogravimetric analysis （ITG） in 410℃ shows that RP can be oxidized completely in 4 minutes, but MRP is oxidized by 45.5% in 13 minutes. The oxidation peak temperature of MRP moves backward 34.0℃. It can be calculated that the autoignition temperature of MRP increases by 14.39 K. The uniformly coated MRP shows better thermal stability than pristine RP.