Explanation

Also called vulcanization accelerator, it is called activator or activamr for short. It refers to the substance that can increase the activity of accelerator, fully develop the promoting effect of accelerator, reduce the amount of accelerator and shorten the vulcanization time. In most cases, vulcanization cannot be carried out without vulcanization activator. Active agents are divided into two categories: inorganic and organic. Inorganic active agents mainly include metal oxides, hydroxides, carbonates and other substances, while organic active agents mainly include fatty acids, weak amines, soaps, polyols and amino alcohols, among which zinc oxide (ZnO, also known as zinc oxide or zinc oxide powder) and stearic acid are the most common types of active agents. zinc oxide is a non-toxic and tasteless white or slightly yellow fine powder with a relative density of 5.47-5.76. It is insoluble in water. According to different production methods, it is generally divided into indirect method, direct method and active zinc oxide. The amount of zinc oxide used as an activator is generally 3-5 parts/100 parts of rubber. Stearic acid is a white waxy solid, insoluble in water but soluble in alcohol. When used as an activator, the general dosage is 0.5-2 phr/100 phr of rubber. In many cases, zinc oxide and stearic acid can be used in the same formula.

Classification