Adding an appropriate amount of vulcanization activator in the production process of reclaimed rubber products can significantly increase the activity of the accelerator, reduce the amount of accelerator, and shorten the vulcanization time. Vulcanization activators are also called auxiliary accelerators, which can be divided into two categories: inorganic activators and organic activators; different types of vulcanization activators have different specific functions and application methods in reclaimed rubber products. The editor will discuss with you in detail Related questions.
1. Inorganic active agent
(1) Varieties: Inorganic active agents mainly include metal oxides, hydroxides and basic carbonates, such as zinc oxide, magnesium oxide, calcium oxide, lead oxide, stannous oxide, and cadmium oxide.
(2) Function: Zinc oxide is the most widely used in reclaimed rubber products. It can speed up the vulcanization rate and increase the degree of vulcanization. It can also be used as a reinforcing agent and a coloring agent. Magnesium oxide can improve the scorch resistance of rubber compound 2YLYY1221, and can also be used as a reinforcing agent in nitrile rubber/reclaimed rubber. Calcium oxide is both an activator and a desiccant; stannous oxide is often used to activate the phenolic resin vulcanization system of butyl rubber. Cadmium oxide can be used as an activator for high heat-resistant vulcanization systems.
(3) Usage and usage: Inorganic active agents are widely used in rubber tires, hoses, tapes, rubber shoes and industrial rubber products. The amount in rubber can be increased to about 5 parts. It should be noted that lead oxide and lead salt are toxic and should not be used in rubber products; in addition, the inorganic vulcanization active agent should be protected from moisture during transportation to avoid packaging damage.
2. Organic active agent
(1) Varieties: Organic active agents mainly include derivatives of fatty acids, amines, soaps and organic accelerators.
(2) Function: ①Amine active agents have good activity on thiazole accelerators. Thiazole and thiuram accelerators can improve the activation effect of amines on xanthogenic acid accelerators. They are used in the production of reclaimed rubber products. Commonly used organic active agent. ②Alcohol activator can not only activate the rubber compound containing white carbon black, but also have the waterproof effect, improve the hardness of the high-hardness rubber compound, and is mostly used in the reclaimed rubber products of non-carbon black reinforcing filler.
③Fatty acid activator helps to break the molecular chain of rubber and is convenient for processing; it can be used except for butyl reclaimed rubber, and can also be used as a plasticizer and softener. ④Fatty acid salt activator is often used in the production of EPDM reclaimed rubber and nitrile reclaimed rubber. It can not only be used as an active agent, but also as a co-crosslinking agent, curing agent, adhesive and photosensitizer.
(3) Usage: Organic active agent can be used in the production of tires, hoses, tapes, rubber shoes, industrial products, and latex products. When using reclaimed rubber to produce rubber products, the organic active agent should be correctly selected according to the performance requirements of the product, the type of reclaimed rubber, and the vulcanization system. In the actual application process, the amount of organic active agent is generally controlled among 0.5-3 parts, which can be directly added to dry glue or latex for use.
When choosing a vulcanization activator for reclaimed rubber products, you must choose a suitable product based on actual needs. While reducing the raw material cost of rubber products, it can improve the vulcanization efficiency and degree of reclaimed rubber, and further optimize the comprehensive indicators of reclaimed rubber products. The editor will continue with you in the later period. Discuss the specific usage and dosage of vulcanization active agent in different rubber products.
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