The activator is the vulcanization activator and the auxiliary accelerator, which can increase the activity of the accelerator, improve the vulcanization rate and vulcanization efficiency, and improve the performance of the vulcanizate during the vulcanization process of the reclaimed rubber. The active agents commonly used in the production of reclaimed rubber products are mainly divided into two categories, inorganic active agents and organic active agents. Among them, inorganic active agents include metal oxides, hydroxides, carbonates, zinc oxide is the most common; organic active agents mainly include fatty acids, weak amines, soaps, polyols and amino alcohols. Different types of active agents play different roles in the vulcanization process of reclaimed rubber.
1. The role of zinc oxide in the vulcanization of reclaimed rubber
Zinc oxide is the most commonly used inorganic active agent in the production of reclaimed rubber products. The addition of zinc oxide to reclaimed rubber can not only speed up the vulcanization rate, but also improve the degree of cross-linking. Accelerators have obvious activation effects. In actual production, zinc oxide can also be used as a reclaimed rubber reinforcing agent, colorant, vulcanizing agent or thermal conductivity assistant.
2. The role of magnesium oxide in the vulcanization of reclaimed rubber
Magnesium oxide, also known as light magnesium oxide, is a commonly used vulcanization activator and inorganic accelerator in the production of reclaimed rubber products. Adding a small amount of magnesium oxide to the reclaimed rubber can significantly improve the vulcanization degree of the reclaimed rubber 2ELYY726, improve the mechanical properties of the vulcanizate, and improve the Vulcanization safety. Taking chlorinated butyl reclaimed rubber as an example, adding an appropriate amount of magnesium oxide to the chlorinated butyl reclaimed rubber compound containing accelerator TMTD and zinc oxide can effectively prolong the scorch time of the compound. Magnesium oxide can also be used as reinforcing agent in butyl reclaimed rubber and as vulcanizing agent, active agent and inorganic accelerator in neoprene reclaimed rubber products. and many more.
3. The role of stearic acid in the vulcanization of reclaimed rubber
Stearic acid is widely used in the production of reclaimed rubber products, not only as a vulcanization activator, but also as a plasticizer and softener. When stearic acid is used as an active agent for reclaimed rubber, it can play an acid-type activation effect, and can form soluble salts with metal oxides to increase the activation ability of metal oxides to accelerators. In reclaimed rubber, it is a source of hydrogen ions and stearate ions, which act as a buffer during vulcanization. When complexed with zinc oxide, it is the source of free radical reaction hydrogen atoms.
4. The role of stannous chloride in the vulcanization of reclaimed rubber
When stannous chloride is used as a vulcanization activator, it is generally used in butyl rubber and butyl reclaimed rubber vulcanized with phenolic resin, which can greatly shorten the vulcanization time of the rubber compound; generally, it can be directly added to the rubber compound during mixing.
5. The role of lead monoxide in the vulcanization of reclaimed rubber
Lead monoxide is a commonly used vulcanization activator in the production of various reclaimed rubber products. It has an activating effect on thiazole and aldehyde amine accelerators, which can speed up vulcanization and improve the mechanical properties of reclaimed rubber vulcanizates. It can also be used as an inorganic accelerator. . Lead monoxide has a moderate vulcanization rate and is mostly suitable for reclaimed rubber products using hot air, direct steam and molding vulcanization.
When using reclaimed rubber to produce rubber products, the active agent has an irreplaceable role. What are the commonly used vulcanization activators in the production of reclaimed rubber products? What role did they play? The editor will continue to discuss related issues with you later.
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