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