氮化硼原位生长钴酸铜对硅橡胶阻燃导热性能的影响

Effect of Copper Cobalt Oxide Grown in Situ by Boron Nitride on Flame Retardant and Thermal Conductivity of Silicone Rubber

硅橡胶(SR)具有耐高低温性、化学稳定性和电绝缘性等优异性能,但因为可燃性,限制了其应用,因此需要进行阻燃改性。通过水热法在氮化硼(BN)表面原位生长钴酸铜(CC)制备出BN@CuCo2O4(BNCC)杂化物,将BNCC加入SR中,研究其对SR复合材料阻燃、导热等性能的影响。结果表明,与SR0相比,添加3 phr BNCC的SR3复合材料的LOI达到了29.6%,提升了10.4%,同时其UL-94等级从NR提高到了V-1等级。SR3的热释放速率峰值(pHRR)、总热释放(THR)分别降低至271.6 kW/m2、51.1 MJ/m2,都较纯SR0有了明显的下降,这表明BNCC对于SR复合材料而言具有良好的阻燃效果。导热率测试结果表明,BNCC能够提高SR复合材料的导热性能。

Silicone rubber(SR)has excellent properties,such as high-and low-temperature resistance,chemical stability,and electrical insulation,while its flammability hinders its practical application.Hence,it is of great significance to improve its flame retardancy.In this paper,BN@CuCo2O4(BNCC)hybrids were successfully prepared by in-situ growth of copper cobaltate(CC)on the surface of boron nitride(BN)by hydrothermal method,and was added to SR to study its effects on the flame retardancy and thermal conductivity of SR composites.The results showed that the LOI of SR3 composites with 3 phr BNCC reached 29.6%,which was 10.4%higher than that of SR0,and its UL-94 grade was improved from NR to V-1 grade.The peak heat release rate(pHRR)of the SR3 composite decreased to 271.6 kW/m2,and the total heat release(THR)decreased to 51.1 MJ/m2,both of which were significantly lower than those of the pure SR0 composite,indicating that BNCC has good flame-retardant properties for SR composites.The thermal conductivity test results showed that BNCC can improve the thermal conductivity of SR composites.