Abstract
The effect of expandable graphite (EG) and modified halloysite nanotubes (HNTs) on the flame retardant properties of silicone rubber foam (SiF) was studied in this paper. Modified HNTs were obtained by surface modification of the silane-coupling agent A-171. The flame retardancy of SiF was studied by limiting oxygen index (LOI), vertical combustion and cone calorimeter tests. The mechanical properties of SiF were analyzed by a universal mechanical testing machine. The LOI results showed that EG/HNTS@A-171 could enhance the LOI of SiF. The cone calorimeter test results showed that EG/HNTS@A-171 effectively reduced the peak heat release rate, the total heat release rate, the smoke production rate, the total smoke production rate, the CO production rate and the CO2 production rate and increased the carbon residue rate. TGA shows that main chain pyrolysis temperature of the SiF is delayed by 123 °C. The mechanical properties test results showed that EG/HNTS@A-171 improved the tensile strength of SiF. These results indicated that EG/HNTS@A-171 can significantly improve the flame retardant performance of SiF.
Highlights
silicone rubber foam (SiF) is a kind of porous material obtained from silicone rubber by physical and chemical foaming methods.[1]
The mechanical properties test results showed that expandable graphite (EG)/HNTS@A-171 improved the tensile strength of SiF. These results indicated that EG/HNTS@A-171 can significantly improve the flame retardant performance of SiF
The mechanical properties were determined on an electronic tensile testing machine (XZW5000N, Jiangsu Xinzhenwei Testing Machinery Co., Ltd., China) with a constant speed of 100 mm minÀ1 at room temperature according to GB/T 5282009
Summary
SiF is a kind of porous material obtained from silicone rubber by physical and chemical foaming methods.[1] It retains the unique electrical properties, chemical resistance, ultraviolet resistance and mechanical stability of silicone rubber[2,3,4] and it has the advantages of low weight, heat insulation, exibility and resilience of foam materials.[5,6] SiF and its composite materials have been widely used in the national defense and military industry and in aerospace, transportation, automobiles and other elds.[1,4,7] In these elds, the ame retardancy requirement of materials is very high. Silicone rubber is a semi-organic and semi-inorganic material, it has a low heat release rate, a low total heat release and a low ignition index.[8,9,10] At the same time, the silicon rubber has excellent thermal stability and can be transformed into a continuous, oxidation resistant and insulating mesh silica fume that is covered on the surface a er combustion,[11] effectively preventing further ablation. Once SiF has been ignited, it can continuously burn, especially the silicon rubber foam material, which is more
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