Preparation And Investigation Of Air-Barrier Thermoplastic Vulcanizates

The purpose of this project is to prepare thermoplastic vulcanizates with high gas barrier properties to replace traditional thermoset butyl rubber material in the innerliners. The materials exhibit functional properties of conventional thermoset rubber, and they can be processed and recycled using thermoplastic fabricating technique. The material applied to the tire can effectively reduce tire quality and increase tire pressure maintaining performance to achieve the purpose of energy saving and environment protection.1. The compatibility between PA and BIIR is very poor, and the compatibility between the rubber and plastics matrix plays a very important role in the properties of the TPVs. Three kinds of compatibilizers namely PP-g-MAH, POE-g-MAH and SEBS-g-MAH were used to increase the compatibility between PA and BIIR. The effect of these compatibilizers on the phase morphology and mechanical properties was studied. The result indicates that PP-g-MAH with the content of 10phr can effectively improve the compatibility.2. The addition of fillers and plasticizers on the effect of phase morphology and mechanical properties of BIIR/PA TPV was studied. The filler added can improve the modulus, promote the gas barrier properties and increase the viscosity of TPV. The plasticizer increase the volume of the rubber phase and phase inversion can hardly happen. In the process of dynamic vulcanization, the crosslinking and breakup of rubber phase occur simultaneously. The temperature should ensure the sufficient crosslinking of the rubber phase, while the extruder should provide enough shear stress to make the rubber phase broken into small particles. The optimum temperature and screw speed of the extruder.3. This paper identifies the appropriate nylon type:nylon terpolymer with the melting point 165℃. The appropriate rubber ratio determined is 65%. In this rubber ratio, BIIR/PA TPV possesses excellent mechanical properties, good barrier property, excellent fatigue resistance and heat resistance. The extrusion and rolling of BIIR/PA TPV solves the problem of molding. By this method, BIIR/PA TPV can be continuously extruded into a thin film. The adhesion of the innerliner and carcass compounds that are typically based on natural rubber is solved by adding epoxy natural rubber, using reactive epoxy groups with maleic anhydride groups to provide sufficient tack and cure adhesion.