The Preparation Of Thermal Conductive Rubber Used In Tire

When vehicles are travelling with high speed, a great lot of heat will be generated within the tires. Since most rubber materials have the low thermal conductivity, the generated heat is accumulated, leading to local high temperature, which will aggravate the utilized properties and decreases the service life of tires greatly. In this paper, nano-alumina/NR nanocomposite was prepared by in-situ modification with Si69, which nano-a-alumina and nano-y-alumina were chosen as reinforcing and thermal conductive fillers. The influence of the loading of nano-alumina, Si69 and the in-situ modification time on the mechanical (static and dynamic) properties and thermal conductivity of the nano-alumina/NR nanocomposite was investigated. Ultimately, nano-alumina/CB/NR nanocomposite with good static and dynamic mechanical and excellent thermal conductive properties which can be used as tire shoulder of the radial truck tires was prepared.1. Nano-a-alumina/NR nanocomposite was prepared by in-situ modification with Si69.The influence of the loading of nano-a-alumina, Si69 and the in-situ modification time on the mechanical (static and dynamic) properties and thermal conductivity of the nano-alumina/NR nanocomposite was investigated. The results indicate that the tensile strength of the nanocomposite decreases with the increase loading of filler, but increases at first and then decreases with the increase loading of Si69 and in-situ modification time; the 300% modulus, compression fatigue heat build-up and thermal conductivity of the nanocomposite increase with the increase loading of filler, Si69 and the in-situ modification time. Considering the mechanical and thermal conductive properties of the nano-composite, the best conditions of the in-situ modification are as follows:nano-a-alumina,100-170phr; Si69,2～4% of the loading of nano-a-alumina; in-situ modification time,4-6min.2. Nano-y-alumina/NR nanocomposite was prepared by in-situ modification with Si69.The influence of the loading of nano-y-alumina, Si69 and the in-situ modification time on the mechanical (static and dynamic) properties and thermal conductivity of the nano-alumina/NR nanocomposite was investigated. The results indicate that the tensile strength and the 300% modulus of the nanocomposite increase at first and then decreases with the increase loading of filler, Si69 and of in-situ modification time; compression fatigue heat build-up increases with the increase loading of filler, but decreases with the increase loading of Si69 and of the in-situ modification time; the thermal conductivity of the nanocomposite increases with the increase loading of filler, but decreases with the increase loading of Si69, the in-situ modification time has slightly influence on the thermal conductivity of the nanocomposite. Considering the mechanical and thermal conductive properties of the nano-composite, the best conditions of the in-situ modification are as follows:nano-y-alumina,≤60phr; Si69,16～24% of the loading of nano-γ-alumina; in-situ modification time,4-8min.3. The mechanical properties, thermal conductivity and dynamic mechanical properties are compared between nano-a-alumina/NR nanocomposite, nano-y-alumina/NR and traditional carbon black N330/NR nanocomposite under the same filler volume fraction loading. The result indicate that, comparing to the traditional carbon black N330, in-situ modified nano-a-alumina filled composites exhibit excellent performance in dynamic properties as well as better thermal conductivity.4. Nano-α-alumina/CB/NR nanocomposites were prepared by in-situ modification. The influence of the loading of carbon black on the mechanical(static and dynamic) properties and thermal conductivity of the nano-a-alumina/CB/NR nanocomposite were investigated under a certain loading of nano-a-alumina. The results indicate that when the loading of nano-a-alumina is 100phr and the loading of carbon black between 15-25phr, the properties of the composites can satisfy the requirements of the tire shoulder of the radical truck tire basically.