Study On Flame Retardancy And Ceramic Properties Of Silicone Rubber Composite Materials

Silicone rubber（SR）has excellent properties,such as high and low temperature resistance,chemical stability,and electrical insulation.However,silicone rubber is flammable,which limits its scope of use,so it is of great significance to modify it for flame retardancy.This paper mainly focuses on the flame retardancy of silicone rubber,and the improvement of the thermal conductivity,antistatic performance,and ceramic performance of silicone rubber materials,with the following exploratory research:（1）BN@CuCo₂O₄（BNCC）hybrids were prepared by in-situ growth of copper cobaltate（CC）on the surface of boron nitride（BN）by the hydrothermal method,and BNCC was added to SR to study the flame retardancy and thermal conductivity of BNCC/SR.The test results showed that,compared with SR0,the LOI of the SR3 composite material added with 3 phr BNCC reached 29.6%,10.4%higher than that of SR0,and its UL-94 grade was improved from NR to V-1 grade.Its peak heat release rate（p HRR）decreased to 271.6k W/m2,and its 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 was more effective for SR composites.It had good flame-retardant properties.The thermal conductivity test results showed that BNCC helped improve the thermal conductivity of the SR composites.（2）A core-shell structured CNTs@CuCo-DH hybrid was prepared by the hydrothermal method,with copper cobalt hydroxide（CuCo-DH）as the core and carbon nanotubes（CNTs）as the shell.The CNTs@CuCo-DH hybrids were added to SR to prepare SR composites,and the effects of the hybrids on the flame retardancy and antistatic properties of the SR materials were studied.The results showed that the flame retardancy of the SR13 composites added with 3 phr CNTs@CuCo-DH was greatly improved.At the same time,its UL-94 rating was raised from NR to V-0.The SR13 composite exhibited a 31.2%lower p HRR,a 25.2%lower THR,and a 28.1%lower total smoke delivery（TSP）compared to the those of the pure SR0composite.In addition,with the addition of 3 phr CNTs@CuCo-DH hybrids,the antistatic performance of the SR13 composites was greatly improved.Therefore,the prepared novel SR/CNTs@CuCo-DH composite will help to expand the range of application of SR materials.（3）Wollastonite,low-melting glass powder and phytate-modified carbon nanotubes（CPCC）were added to SR to prepare ceramizable silicone rubber（CSR）composites,with excellent fire safety performance and better effects of flame retardancy and ceramization properties.The results showed that compared with SR0,the LOI of the CSR6 composites added with 3 phr CPCC reached 33.8%,which was 26.1%higher than that of SR0,and its UL-94 grade was improved from NR to V-0 grade.Compared with the pure SR0 composite,the p HRR of the CSR6 composite decreased by 13.1%,its THR decreased by 26.6%,and its TSP decreased by 10.5%.In addition,after the CSR6 composite had been calcined at1000°C for 1 h,its flexural strength reached 6.17 Mpa.Figures[60]Tables[14]References[122]...