Preparation of High-Strength and Excellent Compatibility Fluorine/Silicone Rubber Composites under the Synergistic Effect of Fillers

Abstract

Fluorine/silicone composite rubber is widely used as a sealing material in aerospace, missile, automotive, petroleum, and other industries, but the traditional process does not use synergistic fillers to strengthen the composite system. In this research, fumed SiO2 and black caron (N990) were used as synergistic fillers, fluorine/silicone composite rubber was prepared by mechanical mixing process, and three different fluorine rubber systems were used to find the best composite material. The mechanical properties, thermal properties, aging properties, moderate strength properties, and microstructure of the composites were evaluated. Studies have shown that mixing the two can produce a certain interface interaction and effectively improve the compatibility. The physical properties of the material tended to decrease during the increase in the added amount of silicone rubber (MVQ). The maximum tensile strength of the hybrid material can reach 15 MPa. The optimal mixing ratio is fluororubber/silicone rubber (FKM/MVQ) = 9/1. At this time, the mechanical properties of the composite material are in the best state, and SiO2 and black caron (N990) have a reinforcing effect, which can effectively improve the mechanical properties. After the composite was kept at 200 °C for 48 h, the tensile strength and elongation of the best sample A1 were 99.5 and 97.0%, respectively, showing excellent anti-aging properties. This work provides a method to fabricate high-strength fluorine/silicone composites using synergistic fillers that may be used in heat-medium-sealed environments.

Fluorosilicone Composites with Functionalized Graphene Oxide for Advanced Applications

“…In the case of FSE compounds containing graphenic materials, the enhanced properties are likely attributed to the interfacial compatibility between graphene and the fluorinated groups of FSE. Comparable results have been reported for fluoroelastomers, such as FKM …”

“…Comparable results have been reported for fluoroelastomers, such as FKM. 41 Figure 3e presents the results of the hardness and abrasion resistance of FSE compounds. The hardness of FSE is approximately 45 Shore A, being this value slightly lower than that reported in the literature, probably due to the type of crosslinking agent used.…”

Graphene in rubber formulations: a comprehensive review and performance optimization insights

“…5 In addition, a small amount of rGO (0.5 wt%) hinders the thermal oxidative degradation of the fluoro silicone rubber that is commonly used in aerospace, military, and automotive industry which commonly operate at elevated temperature. 179,180 The tensile strength of the rGO/fluoro silicone rubber after aging at 230 °C for 3 days is maintained at 87.5% while the initial weight after aging at 350 °C for 12 hours is successfully maintained at 90%. The proposed mechanism suggested that the route of auto-oxidative degradation is blocked by the rGO which scavenges the primary free radical generated by cleavage of the fluoro silicone rubber side group.…”

Effect of Fluorosilicone Rubber on Mechanical Properties, Dielectric Breakdown Strength and Hydrophobicity of Methyl Vinyl Silicone Rubber

“…FSIR has methyl, vinyl and trifluoropropyl side chains, which improve the oil and solvent resistance of the rubber due to the electronic effect and the good shielding effect of the C-F bond on the C=C bond [ 25 , 26 ]. It also has a wide operating temperature range of −60–200 °C and can be operated in cold environments [ 27 ].…”