If natural rubber is not reinforced, it is difficult to produce products with high strength carbon black It can not only improve the strength of vulcanized rubber products, but also improve the properties of rubber compound, giving the products wear resistance, tear resistance, heat resistance, oil resistance and so on Performance 。
For a long time, carbon black is the main reinforcing material of rubber, among them, wear-resistant n series carbon black and high bond Carbon black is widely used in rubber tire industry. On this basis, people pay attention to the development of a variety of silica fillers.
Silica reinforced vulcanizate has low hysteresis loss, low temperature rise and low fuel consumption after being used in tires. Nowadays, it has become one of the main raw materials of green tires with increasing attention to environmental protection. As a kind of aftergrowth filler, silica has shown excellent characteristics such as "low heat build-up and low lag" in tire rubber, which makes the "black-and-white competition" more and more intense in the carbon black industry. Especially in the European tire market, the market of silica is expanding day by day The trend of replacing traditional carbon black.
In recent years, with the deepening of research, it was found that the reinforcement effect of fillers on rubber was closely related to the amount of dry gel (carbon black gel) developed in the rubber compound. Adding fillers into rubber will form a binding rubber with filler as the center. It is known that this structure can have a reinforcing effect on rubber. Therefore, it is of great significance to study and predict the thermal stability of rubber products by using the thermal expansion and dissociation properties of bonded rubber to study the thermal stability of fillers at high temperature and to explore the internal binding force of bonded rubber. In addition, the dynamic thermomechanical analysis method can simulate the actual process of tire in a certain extent, and study the advantages and disadvantages of its reinforcement performance.
The interaction between fillers and rubber can be divided into physical and chemical interactions, ranging from weak van der Waals breaking force to strong covalent bond interaction. The chemical combination is the reaction between the special functional groups on the surface of carbon black and rubber, or the encapsulation and combination of rubber to carbon black which forms large atom field. The binder is the combination of rubber and carbon black. It can be more intuitive to study the combination way of carbon black and carbon black by studying the binder directly.