Performance characterization of vulcanizing accelerator

- Aug 16, 2017-

Rubber vulcanization promotion efficiency is an important standard to measure the quality of accelerator. From the report, the characteristics of accelerator are mainly from two aspects of vulcanization promotion and physical and mechanical properties of vulcanized rubber. vulcanization promotion characteristics mainly investigated are vulcanization rate, Menniggio burning time, positive vulcanization time, positive vulcanization temperature, vulcanization flatness of vulcanization stage and resistance to vulcanization. The physical and mechanical properties of the adhesive are mainly investigated, such as the hardness, elasticity, tensile properties, friction properties and thermal aging properties of vulcanized rubber. However, in recent years, the influence of accelerator on the dynamic viscoelastic properties of Vulcanizate has also been studied extensively. In fact, the effectiveness of the accelerator depends on the physical and mechanical properties of the vulcanizate it confers, and the properties (types and densities) of the crosslinking bonds in the vulcanizate play a decisive role in its application and working characteristics. The strength and dynamic mechanical strength of vulcanizate depend not only on the performance of the polymer chain itself, but also on the number of network support chains in the total cross-net (the connection chain between two connecting points) directly. The crosslink density determines the number of network support chains. It is reported that the hardness and elongation stress of vulcanizate increase with the increase of crosslink density, tearing strength, fatigue life, toughness and tensile strength begin to increase with the increase of crosslink density, and after reaching a maximum value, it decreases with the increase of crosslink density. The hysteresis and permanent deformation properties decrease with the increase of crosslink density.

Dynamic mechanical properties are another important means to characterize rubber properties. In particular, tire tread rubber, it directly affects the tyre tread resistance to moisture and rolling resistance. Dynamic mechanical properties are characterized by dynamic visco-elastic curves. In the process of system research, people realize that the tanδ value of 60 ℃ can reflect the size of the rolling resistance during the rolling process of the vulcanizate, the tanδ value of 80 ℃ reflects the thermal performance, and the ℃ value of 0 tanδ can characterize the wet-slip property of Vulcanizate.