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Shandong FINE Chemical Technology Co., Ltd. ,

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Application of vulcanizing agent, accelerator and other vulcanizing system additives in synthetic rubber

Time:2021-07-08        Read

Vulcanization system additives play an important role in the formulation of synthetic rubber and are one of the main factors affecting the properties of rubber products.


Vulcanization system additives are mainly composed of vulcanizing agent, accelerator and active agent, and its dosage accounts for about 10% of the amount of raw rubber. Depending on the saturation of synthetic rubber, various vulcanization systems such as sulfur, metal oxides, peroxides and amine compounds can be used.


First, curing agent


According to the different performance requirements of rubber and rubber products, sulfur, peroxide, quinone oxime, resin, metal oxide and other different vulcanization systems can be used. Among them, sulfur vulcanization system can be divided into ordinary vulcanization system, effective vulcanization system and semi-effective vulcanization system.


Sulfur vulcanization system is used more in general synthetic rubber and semi-general synthetic rubber, metal oxide vulcanization system is mainly used for neoprene rubber (CR), quinone oxime and resin vulcanization system is mainly used for butyl rubber (IIR), peroxide and resin vulcanization system is mainly used for ethylene propylene rubber (EPR), natural rubber (NR) and styrene butadiene rubber (SBR). Special rubber [such as polysulfide rubber (LP), chlorosulfonated polyethylene rubber (CSM), chlorinated polyethylene rubber (CM), fluorine rubber (FK), silicone rubber (M V Q), fluorine silicone rubber (FVMQ), etc.) are basically saturated rubber, does not contain double bonds, and sulfur does not cross-link it, so it is necessary to use non-sulfur vulcanization system. Such as metal oxides, peroxides, organic amine salt vulcanization system. In recent years, acrylic rubber (ACM) has basically adopted sulfur vulcanization system.


(1) Sulfur. Common powder sulfur is a vulcanizing agent commonly used in rubber industry. With the development of radial tires and colored rubber products, insoluble sulfur (IS), which does not spray, does not affect the adhesion performance and product appearance, is widely used. IS IS mostly used in NR tire compound, which has the effect of improving the bonding property of rubber-skeleton material, avoiding frost spray and extending the storage time of rubber compound. Is IS also used in butadiene rubber (BR) tire compound in a small amount.


(2) Peroxides. In addition to IIR and halogenated butyl rubber (XIIR), the rest of the rubber, especially MVQ, EPDM, NBR, hydrogenated nitrile butadiene rubber (HNBR), CM, CR and thermoplastic elastomers, can almost be cured with peroxide. The crosslinking bond of peroxide-vulcanized rubber compound is C-C bond, and its bond energy is larger than that of single sulfur bond, double sulfur bond and polysulfur bond of sulfur vulcanized rubber compound. Therefore, peroxide-vulcanized rubber compound has excellent heat-resisting oxygen aging property, small compression deformation, easy to spray frost and no vulcanization return phenomenon, but its tensile property, strain property and fatigue resistance are poor.


(3) Resin. In order to improve the heat resistance and aging resistance of adhesives, many types of adhesives (IIR, NR, SBR and NBR, etc.) have widely used resins (such as alkyl phenolic resin, etc.) as crosslinking agents. The resin vulcanized IIR compound has good heat resistance and small compression deformation, and has become the main compound for the manufacture of vulcanized capsules. Phenolic resin vulcanization system is also commonly used in the preparation of rubber and plastic blends such as EPDM/PP.


In addition, petroleum resin added to the manufacture of rubber tires, can play a good role in viscosity, softening, reinforcing, is a good additive.


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